JP3846599B2 - Motor control device and washing machine - Google Patents

Description

  The present invention relates to a motor control device, and more particularly to a motor driving method, rotation stability at the time of motor startup, and a circuit failure detection method.

  FIG. 33 shows a driving circuit for a conventional single-phase induction motor disclosed in, for example, Patent Document 1. In FIG. 33, 1 is a commercial power source, 2 is a single-phase induction motor, and 11 is a zero cross of the commercial power source 1. Is a zero-cross detection circuit, and 8 is a trigger pulse generation circuit to which a zero-cross detection signal is inputted. Reference numeral 12 denotes a triac, and the trigger pulse generation circuit 8 controls the triac 12. 6 is a rotation detector. 19 is a start compensation circuit, 23 is a start compensation phase angle data input terminal, 20 is an operation start signal input terminal connected to the set terminal S, and 22 is a switch and controlled by Q output. 21 is a set rotational speed data input terminal, 13 is a subtracting circuit, 14 is a coincidence detecting circuit for detecting coincidence between the rotational speed data from the subtracting circuit 13 and the rotational speed detected by the rotational speed detector 6, and 15 is a motor rotation. The timer counter for measuring the rise time of the number and the output terminal of the coincidence detection circuit 14 are connected to the timer counter 15 and the start compensation circuit 19. 16 is an arithmetic circuit for estimating the phase angle, 17 is an error detecting circuit for detecting the rotational speed difference between the set rotational speed data and the rotational speed detector 6, and 18 is an integrating circuit for determining the phase angle. Each output of the circuit 17 is input, and the output terminal is connected to the contact a of the switch 22.

  Next, the operation will be described. When the motor 2 is stopped, the set rotational speed is given by the set rotational speed data input terminal 21. When the operation start signal is given to the operation start signal input terminal 20, the start compensation circuit 19 is set, and the Q output becomes the contact b of the switch 22, and the start compensation phase angle data 23 is given to the trigger pulse generation circuit 8, The motor starts to rotate. The data of the rotation detector 6 is compared with the set rotation speed data from the subtraction circuit 13 by the coincidence detection circuit 14. The timer counter 15 integrates the time until the rotation speed data and the rotation speed from the rotation speed detector 6 coincide with each other, and the rise time until the motor 2 reaches the set rotation speed is measured. If the two data match, the arithmetic circuit 16 estimates the initial phase angle value necessary for obtaining the set rotational speed from the rise time, and the integrating circuit 18 sets the value. At the same time, the start-up compensation circuit 19 is reset, the switch 22 is switched to the contact a by the inversion of the Q output, and the output of the integration circuit 18 is input to the trigger pulse generation circuit 8. In this way, when the rotation speed of the motor 2 reaches the set rotation speed data, the phase angle estimated from the rise time is switched.

JP-A-2-262878 (see FIG. 1)

  Since the conventional motor drive circuit is configured as described above, the triac drive pulse signal has a constant width, and therefore the triac cannot be driven when the current phase of the motor advances from the phase of the power source. In addition, when controlling the rotational speed of the motor, it is necessary to calculate the time from the power source zero cross signal to determine the timing for outputting the triac drive pulse signal. Because it was done in a separate routine, the program became longer and the computation time was longer.

  Further, since it is driven at a constant phase angle at the time of startup, it takes time to reach the target rotational speed. When the motor is controlled at the target rotational speed, the triac firing timing is a constant time interval, so the motor tri-ripple is also constant, and as a result, the vibration frequency of the motor is also fixed, and a specific annoying sound is produced. It was supposed to occur. When the maximum rotation speed at the power supply frequency of 50 Hz is set as the maximum use rotation speed of the motor, if the control is lost by the phase control at 60 Hz, the rotation speed exceeds the maximum use rotation speed.

  When the triac that drives the motor fails, the failure cannot be detected and the control circuit continues to output the drive signal. When the microcomputer in the control circuit runs out of control, there is a problem that the forward and reverse triacs of the motor are simultaneously fired and an excessive current flows.

  The present invention has been made to solve the above problems, and an object thereof is to obtain a highly reliable motor control device. In addition, the present invention can reliably drive the motor even if the phase of the motor is ahead of the phase of the power supply, and the calculation of the triac firing timing by the microcomputer can be processed by the same program routine even if the power supply frequency is different. In addition, a control device that can be used for a wide range of applications, such as being able to reach the target rotational speed at an early stage when the motor is started, and further reducing the sound of specific harshness due to tricriple by phase control, can be obtained. . Further, it is possible to detect a triac failure and an abnormal rotation speed of the motor at the time of the triac failure. It is another object of the present invention to prevent simultaneous energization of the forward and reverse triacs of the motor. In addition, it is possible to obtain a control device that provides a user-friendly motor-use device. Furthermore, it aims at obtaining a reliable and easy-to-use washing machine.

  The motor control device of the present invention includes a motor, a rotation speed detection means for detecting the rotation speed of the motor, a motor drive means for driving the motor by phase control for both 50 Hz / 60 Hz, and zero crossing of energization to the motor. A power frequency determining means for determining a power frequency by a signal; a power frequency is determined to be 60 Hz by the power frequency determining means; and the motor is driven by the motor driving means based on the output signal of the rotational speed detecting means and the speed command value. In this case, there are provided determination means for determining that the 100% energization state has passed an arbitrary time, and energization stop means for stopping the energization current to the motor based on the determination of the determination means.

  The motor control device of the present invention includes a motor, a rotation speed detection means for detecting the rotation speed of the motor, a motor drive means for driving the motor by phase control for both 50 Hz / 60 Hz, and zero crossing of energization to the motor. A power frequency determining means for determining a power frequency by a signal; and an energization stopping means for stopping energization from the power source to the motor driving means. The power frequency determining means determines that the power frequency is 60 Hz, and the rotation speed detecting means. When the rotational speed detected by the motor exceeds the maximum rotational speed at a power frequency of 50 Hz, the energization to the motor is stopped.

  The motor control device of the present invention includes a motor, a rotation speed detection means for detecting the rotation speed of the motor, a motor drive means for driving the motor by performing phase control with a triac so that the motor can be rotated forward and backward, and a current flowing through the motor A current detection unit that detects power, a power supply stop unit that stops power supply from the power source to the motor drive unit, a diagnostic unit that diagnoses a triac failure based on detection values detected by the rotation speed detection unit and the current detection unit, The current value detected by the current detection unit when the current is detected by the current detection unit when the phase control is not energized to the coil of the motor by the diagnostic means, or the current value detected by the current detection unit when the phase control is energized to the coil is greater than an arbitrary value. When this is detected, energization of the motor is stopped.

  The energization stop means of the motor control device of the present invention is performed by opening and closing a switching device provided in a circuit from the power source to the motor, and a triac for phase control of the motor is provided for forward rotation and reverse rotation, respectively.

  The washing machine of this invention is equipped with at least one of the motor control devices of this invention.

  The washing machine of the present invention is equipped with at least one of the motor control devices of the present invention including an energization stop means, and can display information related to the motor stop when the motor is stopped.

  According to the present invention, when the motor is driven by the phase control at the power supply frequency of 60 Hz and the 100% energization exceeds an arbitrary time due to a failure of the rotation speed detector or the like, the energization to the motor is stopped and the motor is stopped. Since the rotation is stopped, it is prevented to keep rotating at a higher speed than necessary.

  Further, according to the present invention, when the motor is driven by phase control at a power supply frequency of 60 Hz, the motor is deenergized when an arbitrary rotation speed exceeding the maximum rotation speed at the power supply frequency of 50 Hz is detected. Since the rotation of the motor is stopped, it is possible to prevent the motor from continuing to rotate at an unnecessarily high speed due to a failure of the triac at a power frequency of 60 Hz.

  Further, according to the present invention, when the current detection unit detects the current when the phase control to the coil of the motor is not energized, or when the current of the current detection unit detects an arbitrary value or more when the phase control energization to the coil, Since it is judged that the triac is on or off, etc., the motor drive unit is de-energized and the motor rotation is stopped, so it is possible to stop the motor safely without continuing excessive current flow to the motor. Become.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a commercial power source, 2 is a single-phase induction motor, 3 is a capacitor, 4 is a rotation speed detector for detecting the rotation speed of the single-phase induction motor 2, and 6 is a rotation output from the rotation speed detector 4. Speed signal, 12a and 12b are triacs for energizing the main and auxiliary windings of the single-phase induction motor 2, 9a is a triac drive signal for driving the triac 12a, 9b is a triac drive signal for driving the triac 12b, 8 Is a trigger pulse generating circuit for outputting a triac drive signal 9, 10 is a rotation speed command signal, 11 is a zero cross detection circuit for detecting a zero cross of the commercial power supply 1, and 7 is a rotation speed signal 6, a rotation speed command signal 10 and a zero cross detection circuit. 11 is input, and a speed calculator that calculates the output timing of the triac drive signal 9 is provided. Microcomputer for outputting a signal to the circuit 8, 5 is a control circuit composed of a microcomputer 7 and a trigger pulse generating circuit 8 and the zero-cross detection circuit 11.

  Next, the operation of this embodiment will be described. By inputting the rotation speed command signal 10 to the microcomputer 7, the drive timing of the triac 12 is determined based on the signals from the zero cross detection circuit 11 and the speed detector 4, and the timing signal is output to the trigger pulse generation circuit 8. . A driving pulse signal is output from the trigger pulse generating circuit 8 to the triac 12, the triac 12 is turned on, and the single-phase induction motor 2 rotates. The rotational speed of the single-phase induction motor 2 is detected by the rotational speed detector 4 and a rotational speed signal 6 is output to the microcomputer 7. Here, the drive timing of the triac 12 is calculated by the microcomputer 7 so as to coincide with the rotational speed command signal 10, and feedback control by phase control is performed. The triac 12a is for forward rotation and 12b is for reverse rotation.

  2, 3, and 4 show the voltage waveform V of the commercial power source 1, the zero cross signal output from the zero cross detection circuit 11, the trigger pulse signal output from the trigger pulse generation circuit 8, and the current waveform I flowing through the single-phase induction motor 2. The operation timing is shown. In FIG. 2, the trigger pulse signal has a pulse width of 1 msec and is generated with a delay of 5 msec from the zero cross signal. At this generation timing, the triac 12 is turned on, current flows to the single-phase induction motor 2 and is controlled by phase control. Yes. In FIG. 3, the trigger pulse signal is generated immediately after the zero-cross signal, and current flows at the timing of the first trigger signal. At the next trigger timing, the motor current is advanced (2 msec) and the trigger pulse width ( If the phase lead is 1 msec) or more, the triac cannot be fired and the phase cannot be controlled.

  Here, considering the maximum lead phase of the motor current, the trigger pulse width is set to 3 msec in order to drive the triac reliably. As shown in FIG. 4, when the trigger pulse signal output timing is within 3 msec from the zero cross signal, the trigger pulse signal output width is set to 3 msec, so that the triac can be driven reliably even at the maximum lead phase of the motor current, and the phase control is performed. Can be done. In the above embodiment, the case where the trigger pulse is a one-pulse output has been described, but the trigger pulse has the same effect even when a signal composed of a plurality of pulses is output. The signal composed of a plurality of pulses is a signal for sending many pulses instead of one pulse during 3 msec when the trigger signal is output for 3 msec. The triac firing signal reduces the power consumption of the circuit as a pulse signal, which makes it possible to reduce the size of the power supply circuit and the size of the circuit, and to reduce the installation space for the washing machine. Further, by making the signal for widening the output width into a pulse train, the signal generation circuit can be simplified and the power consumption can be further reduced.

  The trigger pulse in the above description refers to a case where the trigger pulse exists within a certain time (3 msec in the embodiment) from the zero cross signal regardless of the difference between the target and the actual rotational speed or the magnitude of the load. Here, the trigger pulse signal is within a certain period of time from the zero cross signal when the motor load including acceleration is large. The generation timing of the trigger pulse is determined by calculation of the microcomputer 7 from the rotation speed signal 6 and the rotation speed command signal 10 from the rotation speed detector 4 that detects the rotation speed of the single-phase induction motor 2. It can be easily determined whether it is near the zero cross (3 msec in the embodiment) or not. This pulse width determination flow is shown in FIG. Thus, when the pulse signal width for triac driving is 3 msec, a current is supplied from the power source for 3 msec. When the pulse signal width is 1 msec, a current is supplied from the power source for 1 msec. Therefore, if the pulse width can be driven even by a triac, the narrower one can reduce the power consumption, and the power circuit can be reduced in power consumption and downsized. The above description has been made with respect to the main coil and auxiliary coil of the single-phase induction motor. However, it is a matter of course that the present invention is not limited to this description as long as phase control is performed by a motor having a coil.

  Another example of the present invention will be described with reference to the drawings. FIG. 6 shows a flow of a calculation routine for calculating the firing timing of the triac that energizes the motor. Here, the circuit configuration is shown for the same case as in FIG. 1, and the basic operation is as described above.

Next, the operation of this embodiment will be described. In FIG.
(Step 1) First, the rotational speed of the single-phase induction motor 2 is detected by the rotational speed detector 4, and the rotational speed signal 6 is input by the microcomputer 7.
(Step 2) The rotational speed signal 6 and the rotational speed command signal 10 are compared.
(Step 3) The triac firing position, which is the time from the power source zero cross signal to the output of the trigger pulse, is calculated and converted to normalized data within the range of 0 to 100%.
(Step 4) Then, the triac firing position that matches the power frequency is calculated by multiplying the normalized data and the power half cycle time. This normalized data is obtained by setting the half cycle time of the power supply frequency to 100%. In step 4, it is possible to determine the vicinity of the zero cross in the first embodiment, and it is determined whether this is within 3 msec, for example.
Here, a procedure for creating the normalized data will be described. When the motor is controlled to the target rotational speed by phase control, the power supply frequency is 50 and 60 Hz, the firing timing of the triac that drives the motor is different, so it is necessary to determine each power supply frequency and determine this timing. is there. This frequency discrimination may be made by a microcomputer when the power is turned on. After determining the power supply frequency, the time between two consecutive power supply zero-cross signals is measured, and this time is taken as 100% and normalized data from 0 to 100%. Thereafter, the processing in the calculation routine of FIG. 6 is performed during operation in phase control. That is, the time between successive power supply zero cross signals is normalized, and calculation is performed using this data. Even if the power supply frequency changes, the calculation routine (step 1) to (step 3) can be handled by changing the power supply half cycle time in (step 4) while keeping the same calculation program. Simplification and calculation time can be shortened.

  The conditions used for the ignition position calculation in FIG. 5 are a rotation speed signal, a rotation speed command signal, and a power supply half cycle time. Next, FIGS. 7 and 8 show the measurement of the zero cross time of the commercial power supply and the determination of the power supply frequency. FIG. 7 shows the procedure for measuring the zero-crossing time after detecting the zero-crossing signal. The falling edge of the signal waveform is detected (step 1), the timer is started by this detection (step 2), and the next signal waveform falls again. An edge is detected (step 3) and the timer is stopped. At this time, the microcomputer's internal timer indicates the time between two consecutive zero cross signals. Alternatively, if the power supply frequency can be determined, it can be calculated. For example, at 50 Hz ----- 1/50/2 = 10 msec may be stored in the memory. On the other hand, FIG. 8 shows a determination procedure of the power supply frequency. When the zero-cross signal is input to the microcomputer by the zero-cross detection means (step 1), the time t between the zero-cross signals is measured by the procedure of FIG. 7 (step 2). ). Based on this time, it is determined whether it is 50 Hz (steps 3 and 4) or 60 Hz (steps 5 and 6). This determination is based on whether the power supply half cycle time data stored in advance in the program is called and exists near this time. Thereafter, as shown in FIG. 6 and step 4, for example, when 50 Hz and normalized data = 0.2, the firing position = 10 × 0.2 = 2 msec, and a trigger pulse is output 2 msec after the zero cross signal is detected. The setting of the power supply frequency in FIG. 6, that is, the setting of the power supply half cycle, is different from the calculation routine of FIG. 5 in which the ignition position is calculated when it is determined when the washing machine is turned on.

  Still another example 3 of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in the above example, and the basic operation is as described above. FIG. 9 shows a motor control block diagram for performing PI control, and 27 is a PI control unit for inputting a rotational speed deviation ΔW of 25, which is a difference between 24 target rotational speed W * and 26 motor rotational speed W. And 28 command voltage V is output. Reference numeral 29 denotes a limiter, which inputs the command voltage V of 28, limits it to an arbitrary value, and outputs a motor applied voltage V 'of 30. Reference numeral 31 denotes a motor model, which is composed of a torque generating section 32 for inputting 30 motor applied voltage V 'and a motor shaft inertia 35. The generated torque Te33 is output from the torque generating unit 32, and the difference between the generated torque Te of 33 and the load torque TL of 34 is the motor shaft inertia 35. Reference numeral 36 denotes the motor rotational speed ω at this time. Reference numeral 4 denotes a rotational speed detector that detects the rotational speed of the motor, which receives the motor rotational speed ω36 that is the output of the motor model 31 and outputs the motor rotational speed W26. FIG. 10 shows a calculation routine for operations performed by the 27 PI control calculation unit.

  Next, this operation will be described. In FIG. 9, the rotational speed detector 4 measures the motor rotational speed ω36 and outputs a motor rotational speed W26 of a pulse signal having a frequency proportional to the motor rotational speed ω36. A rotational speed deviation ΔW25, which is the difference between the motor rotational speed W26 and the target rotational speed 24, is output to the PI control calculation unit 27. Here, the rotational speed deviation ΔW25 is input, calculated according to the calculation routine, and then the command voltage V28 applied to the motor is output. The command voltage V28 is limited by the limiter 29 from 100% to 20%, and is output to the torque generator 32 as a motor applied voltage V'30. The torque generator 32 generates a torque proportional to the motor applied voltage V′30. The motor rotates at a motor rotational speed ω36 with the motor shaft inertia 35 at the difference torque between the generated torque Te33 and the load torque TL34. By repeating the above operation, the motor rotation speed W is controlled to coincide with the target rotation speed W *.

Here, a calculation routine for calculating the triac firing timing by the PI control will be described with reference to FIGS.
(Step 1) First, as an initial value, zero is input to the proportional term data G1 (= K1 × ΔW), and an initial value A other than zero is input to the integral term data G2 (ΣΔW × K2).
G1 = 0, G2 = A
(Step 2) The product of the rotation speed deviation ΔW and the proportional term gain K1 is set as the proportional term data G1.
Here, the rotational speed deviation ΔW is calculated by the following equation.
ΔW = W * −W = (1−T * / T) / T * (1)
(1) Normalize the equation and ΔW = (1−T * / T) (2)
T is the output pulse width of the rotational speed detector. T * is the target output pulse width of the rotational speed detector. (Step 3) The product of the rotational speed deviation ΔW and the integral term gain K2 is added to the old integral term data G2. Is integral term data G2. Here, when the calculation routine is performed for the first time, the old integral term data G2 becomes the initial set value A.

(Step 4) The sum of the proportional term data and the new integral term data is set as a proportional / integral term added value GG.
GG = G1 + G2 = K1 × ΔW + ΣΔW × K2 (3)
(Step 5) The proportional / integral term addition value GG is limited to zero when the value is zero or less, and to 1 when the value is 1 or more. Here, in order to simplify the calculation, GG is limited from zero to one.
(Step 6) TT uses the limited GG data as one's complement.
(Step 7) In the limiter, the maximum value of TT is limited to 0.8. Here, the triac is ignited by 20 to 100% energization.

(Step 8) The time TCNT from the power zero cross signal to the trigger pulse signal is calculated.
TCNT = TT × TMAX (4)
TT is a value obtained by complementing 1 to GG data. TMAX is a half cycle time of the power supply frequency. (Step 9) Input wait time of the power supply zero cross signal. This zero cross signal is detected by the zero cross detection circuit 11 of FIG. The timing signal is output to a microcomputer.
(Step 10) Wait for TCNT time from the input of the power supply zero cross signal.
(Step 11) A trigger pulse for driving a triac is output.
After outputting a trigger pulse having a predetermined time width in (Step 11), the process proceeds to (Step 2) and thereafter the same processing is performed.

  Here, in (Step 1), the initial value of the integral term G2 is ΔW = 0 and G1 = 0 when the motor speed W26 coincides with the target speed W * 24 and the target speed is obtained. If G2 = A at this time, this value A is set. At the time of start-up, when the initial value G2 = 0, the integral term data G2 is accumulated and it takes time to reach A, so it takes time at the first start-up. Therefore, by setting A to G2, the accumulated time is shortened from the time of the first activation, and the target value can be reached quickly. In the case of performing the activation a plurality of times, the first term data may be used as the integral term data G2 at the second and subsequent activations. In the case of a washing machine, washing can be performed reliably from the first activation.

Based on the above, for example, the triac firing position calculation in Step 3 of FIG. 6 is calculated by TT × TMAX (= TCNT) in Step 3 of Example 3 and FIG. Thus, when the motor rotation rises rapidly as shown in the first activation of FIG. 16, cleaning can be performed reliably in order to generate a strong water flow. Note that the integral term of PI control has a learning function, stores test data at the manufacturer or a value at the previous use, and sets it as an initial value. The procedure is shown below.
a. At the end of the cleaning process, the integral term data is stored in the memory.
(Test data from the manufacturer may be used)
b. At the start of the cleaning process, the integral term data is read from the memory.
c. At the first activation, the data stored in the memory is used for the calculation.
d. At the second activation, the data obtained at the first activation is used in the calculation.
e. The third and subsequent times are the same as the second time.

  Still another example of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in FIG. 9, and the basic operation is as described above.

  Next, the operation of this example will be described. FIG. 11 shows the integral term data G2 of the PI control, which corresponds to the motor load. FIG. 12 and FIG. 13 show control over the target rotational speed, and repeated operation / stop at regular time intervals, and the time variation of the motor rotational speed at this time is shown. FIG. 12 shows the temporal change of the motor speed when the initial value of the integral term data G2 is set to zero. As described above, the time to reach the target speed is long at the first start-up. turn into. FIG. 13 shows the time variation of the motor rotation speed at this time when A1 is set as the initial value of the integral term data G2 when the motor load of FIG. 11 is high. As described above, the time required to reach the target rotational speed at the first start-up can be shortened. Thus, by giving an initial value other than zero to the integral term data G2 in accordance with the load amount of the motor, the time to reach the target rotational speed at the first motor start can be shortened. In the case of a washing machine, washing can be performed reliably from the first activation.

  Still another example of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in the ninth embodiment, and the basic operation is as described above.

Next, the operation of this example will be described. FIG. 14 shows the integral term data G2 of the PI control, which corresponds to the motor target rotational speed. FIGS. 15 and 16 show control over the target rotational speed, and repeated operation / stop at regular time intervals, and the time variation of the motor rotational speed at this time is shown. FIG. 15 shows the temporal change of the motor speed when the initial value of the integral term data G2 is set to zero. As described above, the time required to reach the target speed N1 or N2 at the first start-up is shown. It will be long.
FIG. 16 shows B1 or B2 as the initial value of the integral term data G2 when the motor target rotational speed in FIG. 14 is N1 or N2, and shows the temporal change of the motor rotational speed at this time. As described above, it is possible to shorten the time required to reach the target rotational speed at the first start-up. Thus, by giving an initial value other than zero to the integral term data G2 in accordance with the motor target rotational speed, the time to reach the target rotational speed at the first motor start can be shortened. The above description is based on the load amount of the motor, but naturally this includes the moment of inertia of the motor and the torque of the load. The target rotation speed at the time of starting the washing machine will be described. In order to generate a water flow by washing the washing machine, a rotating blade in a washing tub driven by a motor is rotated. Normally, the motor does not perform variable speed control, so it repeats forward / reverse rotation at a constant maximum speed. In the present invention, the motor is made variable and the water flow is generated at a speed lower than the maximum speed. This is a wash with a weak stream of water, such as wool, that causes pain. In order to generate this weak water flow, the rotational speed of the motor is made lower than the maximum rotational speed by phase control. The low rotation speed at this time becomes the target rotation speed. In the case of the washing machine of the present invention, if a target is set, cleaning can be reliably performed from the first activation in any state.

  Still another example of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in FIG. 1, and the basic operation is as described above.

  Next, the operation of this example will be described. FIG. 17 shows temporally the relationship between the zero cross signal output from the zero cross detection circuit 11 and the trigger pulse signal 9 output from the trigger pulse generation circuit 8 after a twx time delay from the zero cross signal. Here, when the motor rotation speed matches the target rotation speed and the rotation speed is stabilized, the trigger pulse signal 9 is output with a certain time delay from the zero cross signal. At this time, the torque ripple of the motor becomes a constant frequency, and the motor vibration is the same. At this time, a specific magnetic sound or noise caused by vibration is generated from the motor or the device equipped with the motor. In general, the noise spectrum at this time is an integer multiple of the power supply frequency.

Therefore, when the motor rotation speed matches the target rotation speed and the rotation speed is stabilized, the output timing of the trigger pulse signal 9 is varied before and after the stable timing as shown in equation (5) by phase control. The average value of twx here coincides with the timing when the rotation speed of the motor is stable. Here, the rotational speed at the time of stability refers to the time of motor rotation in a state where the target rotational speed is reached and there is no large rotational fluctuation. In another embodiment, the rotation speed of the motor in the other embodiment is rotating at the set rotation speed Ns.
(Average of twx) = (Σtwx) / N (5)
twx is the time from the zero cross signal to the generation of the trigger pulse signal. N is the number of pulse outputs. For example, the control circuit microcomputer can have a normal distribution as shown in FIG. 18 or a random distribution as shown in FIG. It may be a case where a value is generated and distributed uniformly. This is stored in the memory unit of the microcomputer so that twx becomes the normal distribution of FIG. 18 or the uniform distribution of FIG. 19, and twx is varied. By generating such a trigger pulse, it is possible to change the torque generated by the motor and reduce noise caused by unpleasant specific magnetic sound or vibration. Note that the average of the target and the variation need not match completely, but since the difference between the two becomes the difference between the target rotational speed of the motor and the actual rotational speed, it is necessary that the two are substantially the same. Therefore, in a washing machine, it is necessary to agree within a few seconds. Here, although the case where it coincides with a specific target rotational speed is shown, when there is no target rotational speed in particular, this technique may be used as a specific frequency countermeasure, for example. By implementing this method in a washing machine, a quiet washing machine can be obtained, and discomfort due to the noise of the user can be eliminated.

  Still another example 7 of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in FIG. 1, and the basic operation is as described above.

Next, the operation of this example will be described. FIG. 20 shows the change over time in the motor rotation speed, and Nmax in the figure indicates the rotation speed that satisfies the following equation (6).
N60min>Nmax> N50max (6)
N60min is at the power supply frequency of 60Hz and the minimum rotation speed including the voltage fluctuation N50max is the power supply frequency at the frequency of 50Hz and the maximum rotation speed including the voltage fluctuation. In the circuit of FIG. 1 and FIG. The rotational speed of the induction motor 2 is controlled to the same rotational speed regardless of the power supply frequency (t1 section in FIG. 20). When the power supply frequency is 60 Hz, when a failure occurs such that the output from the rotation speed detector 4 becomes equal to zero, the microcomputer 7 sets the power supply rate of the triac to accelerate the single-phase induction motor. Finally, 100% energization is achieved. At this time, the condition of the expression (6) is satisfied. Therefore, if 100% energization continues for an arbitrary time (t2 section in FIG. 20), the microcomputer 7 determines that the rotation speed is higher than the rotation speed Nmax and is an abnormal rotation speed, and generates a trigger pulse to the trigger pulse generation circuit 8. Is sent, the triac is stopped, and the single-phase induction motor 2 is stopped (t3 section in FIG. 20). Since the microcomputer 7 determines phase control (trigger timing) based on the rotation speed command signal 10 and the rotation speed signal 6, the microcomputer 7 recognizes 100% energization. From the rolling position of the phase control, the trigger timing is immediately after the zero cross signal is input, and therefore it can be determined that a voltage equivalent to the power source is applied to the motor. In the flowchart, since the triac rolling position is determined in step 4 of FIG. 6, it is possible to determine 100% energization in this step. The timer can measure time by using an internal timer of the microcomputer 7.

  FIG. 23 shows the structure of the washing machine. 46 is a washing machine main body, 44 is a water absorption hose that absorbs water from water, etc., 45 is a water injection port, 54 is a water absorption valve connected between the water absorption hose and the water injection port 45, 52 is a washing tub, and 53 is a washing tub 52. A support rod for supporting, 51 is a discharge hose for discharging water in the washing tub 52, 50 is a drain valve connected between the drain hose and the washing tub 52, 55 is a rotating shaft connected to the washing tub, 47 is a motor , 49 is a pulley connected to the rotary shaft 55, and 48 is a belt that transmits the power of the motor 47 to the pulley 49. Here, in the case of a washing machine, if phase control is used in order to share the power supply frequency in the 50/60 Hz area, the use in the 60 Hz area is the maximum rotation in the 50 Hz area when 100% energization occurs due to a circuit failure or the like. The number of revolutions may be reached exceeding the number. At this time, the washing tub is greatly shaken and the safety function is activated to stop the washing. The user remains unclear about the cause of the circuit breakdown. 100% energization refers to a state in which the motor is directly connected to the power source and the motor is rotating. In phase control, a trigger generation timing is a state that is delayed by 0 msec from the zero cross signal. Here, 100% energization due to the occurrence of rotation failure or the like means that the triac drive trigger generation timing is delayed from the zero cross signal (for example, 5 msec), but the triac is 100% energization due to a short failure or the like. Refers to the same state. However, by using the method shown in this embodiment, it is possible to prevent a large shaking of the dewatering tank in advance, and to inform the user of the details by displaying the cause on the control circuit. As a result, the user can be prevented from repeatedly using the apparatus, and the cause is clear, so that the repair time during service can be shortened.

  Still another example 8 of the present invention will be described with reference to the drawings. In FIG. 21, 1 is a commercial power source, 2 is a single-phase induction motor, 3 is a capacitor, 4 is a rotational speed detector for detecting the rotational speed of the single-phase induction motor 2, and 6 is a rotational speed output from the rotational speed detector 4. Signals 38a and 38b are a relay drive circuit and a relay contact for stopping energization from the AC power source 1 to the single-phase induction motor 2, and 37 is a current detection resistor for detecting a current flowing from the AC power source 1 to the single-phase induction motor 2. 39 is a current detector for measuring the voltage across the current detection resistor 37, 12a and 12b are triacs for energizing the main and auxiliary windings of the single-phase induction motor 2, and 9a is for driving the triac 12a. 9b is a triac drive signal for driving the triac 12b, 11 is a zero cross detection circuit for detecting a zero cross of the AC power supply 1, and 7 is a microphone. A computer receives an output signal from the rotation speed signal 6 and the zero-cross detection circuit 11 and the current detection unit 39. Reference numeral 8 denotes a trigger pulse generation circuit for driving the triac 12 by a signal from the microcomputer 7, and 5 denotes a microcomputer 7, a trigger pulse generation circuit 8, a zero cross detection circuit 11, a relay drive circuit 38 a, and a current detection unit 39. It is a control circuit.

  Next, the operation of FIG. 21 will be described. Based on the signals from the zero cross detection circuit 11 and the speed detector 4, the microcomputer 7 determines the drive timing of the triac 12 for controlling the target rotational speed, and outputs the timing signal to the trigger pulse generation circuit 8. . A driving pulse signal is output from the trigger pulse generating circuit 8 to the triac 12, the triac 12 is turned on, and the single-phase induction motor 2 rotates. The rotational speed of the single-phase induction motor 2 is detected by the rotational speed detector 4 and a rotational speed signal 6 is output to the microcomputer 7. Here, the drive timing of the triac 12 is calculated by the microcomputer 7 so as to coincide with the target rotation speed, and feedback control by phase control is performed. The triac 12a is for forward rotation and 12b is for reverse rotation.

  Next, the operation of this example will be described. FIG. 22 shows the change over time of the motor rotation speed, and Nmax in the figure indicates the rotation speed that satisfies the condition of the above-described equation (6). In the circuit of FIG. 21 and FIG. 22, the rotational speed of the single-phase induction motor 2 is now controlled to the same rotational speed regardless of the power supply frequency by phase control (t1 section in FIG. 22). When the power frequency is 60 Hz, when the motor is energized 100% due to a triac on failure or other failure (section t2 in FIG. 22), the rotational speed detector 4 detects the rotational speed at this time, The rotational speed signal 6 is output to the microcomputer 7. Next, the microcomputer 7 recognizes that the rotation speed is higher than the rotation speed Nmax, and determines that the rotation speed is abnormal. Further, a signal for stopping the generation of the trigger pulse is sent to the trigger pulse generating circuit 8, the triac is stopped, and the single-phase induction motor 2 is stopped (t3 section in FIG. 22).

Detecting the voltage at both ends of the current detection resistor 37 (39) or 100% energization by a microcomputer, and when the failure continues to turn on the triac (failure such as rotation speed detection), the motor stops when the output signal stops Stop. If the triac is on, the relay contact 38b is opened. Here, in the case of a washing machine, if phase control is used in order to share the power supply frequency in the 50/60 Hz area, the use in the 60 Hz area is the maximum rotation speed in the 50 Hz area when 100% energization occurs due to a circuit failure. May reach an abnormal rotational speed. At this time, the washing tub is greatly shaken and the safety function is activated to stop the washing. The user remains unclear about the cause of the circuit breakdown. However, by using the method shown in this embodiment, it is possible to display the cause of failure by judging whether the relay has been operated or stopped, so it is possible to prevent a large shaking of the dehydration tank in advance, and the cause can be controlled by the control circuit. It is possible to inform the user of the details by displaying in. As a result, the user can be prevented from repeatedly using the device, and the cause is clear, so that the repair time at the time of service can be shortened. Examples of such circuit failures are as follows.
-100% power is supplied due to a triac short failure.-A rotation speed detector generates the same signal as when the motor is not rotating.-A trigger pulse generation circuit failure occurs. Generates a signal that continues to drive the triac. Generates a signal that continues to drive the triac when the output port of the microcomputer fails. In this way, 100% energization is caused by a circuit failure, and the rotation speed of an arbitrary motor is detected. When an abnormal rotation speed is detected, the energization is stopped and the motor drive is stopped, thereby reliably preventing a failure. The display on the washing machine may be performed where the user can see the operation unit. Since this display is a malfunction of the washing machine, the end user receives a repair by the service and displays that it cannot be used during that time. For example, “service”, “inspection”, etc. are displayed. “Circuit error” is displayed.

  The zero-cross detection circuit 11 is the same as that up to the seventh embodiment, the operation is as described above, and the configuration for outputting the triac drive pulse in FIG. 1, the configuration for phase control in FIG. 6, and the third embodiment , 4 and 5, the configuration for controlling the rotational speed by PI control, the configuration for phase control in FIG. 17, the configuration for phase control in FIG. 20, and the configuration for phase control in FIG.

  Still another example of the present invention will be described with reference to the drawings. The circuit configuration is shown for the same case as in FIG. 21, and the basic operation is as described above.

  FIG. 24 shows temporally the number of rotations of the single-phase induction motor 2 and the current flowing through the single-phase induction motor 2 at that time. No in the figure is the number of rotations in a steady state, and the current value flowing at this time is indicated by Io. Nmin is the minimum number of revolutions in the actual use state, and it is determined that the motor is stopped below this number of revolutions, for example, 10% of the maximum revolution number. Imax indicates a current value that flows through the single-phase induction motor 2 when the triacs 12a and 12b are simultaneously turned on. Now, the triac 12a is turned on, and the single-phase induction motor rotates at the rotation speed No. At this time, a current Io flows through the current detection resistor 37 (t1 section in FIG. 24). Here, when the other triac 12b fails to turn on, the motor rotation speed gradually decreases to Nmin rotation or less. The current value at this time increases to Imax. When the state of the rotation speed Nmin or less and the current value Imax elapses for t2 hours, the microcomputer 7 determines that the triac 12b is on and outputs a stop signal to the trigger pulse generation circuit 8, and outputs a trigger signal 9a to the triac 12a. Stop. Further, a relay drive signal is transmitted to the relay drive circuit 38a, the relay contact 38b is opened, and energization to the single-phase induction motor 2 and the triac 12 is stopped. Here, the time t2 is, for example, shorter than the time when the thermal fuse is blown due to the temperature rise of the motor when the triacs 12a and 12b are energized simultaneously.

  The procedure of this protection operation is shown in FIG. After the triac-on (step 1), it is determined whether the current is within the limit value (step 2), it is determined that the current is normal (step 3), and if the limit value is exceeded, the time in the Imax state is measured (step 4) When the time exceeds a predetermined value, the triac is turned off (step 5). The idea of the predetermined value for this time is that the forward and reverse triacs are turned on at the same time, and there is an adverse effect on others such as element destruction due to abnormal heating of the triac or heat resistance of the substrate etc., winding breakage due to motor temperature rise. It is within a time that does not reach, and a stop within tens of seconds is a realistic value. In the case of a washing machine, if there is no diagnosis and protection function as described above, the motor temperature rises due to overcurrent to the motor, and the thermal fuse is blown. By providing the above diagnosis and protection function, such a situation can be prevented, and further, the repair can be simplified by using only the control circuit.

  Still another example of the present invention will be described with reference to FIGS. The circuit configuration is shown for the same case as in FIG. 21, and the basic operation is as described above.

  Next, the operation of this example will be described with reference to FIG. FIG. 26 shows temporal changes in the on / off timing of the triacs 12a and 12b and the current value flowing through the current detection resistor 37 at that time. The current value Io indicates a current flowing through the current detection resistor 37 when either the triac 12a or 12b is turned on. Imax indicates a current value that flows through the single-phase induction motor 2 and the current detection resistor 37 when the triacs 12a and 12b are simultaneously turned on. First, a stop signal for the triacs 12a and 12b is output from the microcomputer 7 to the trigger pulse generating circuit 8 for a time t1 (step 1). At this time, the microcomputer 7 confirms that no current flows through the current detection resistor 37 (step 2), thereby recognizing that both triacs are not on-failure.

  If both triacs are not on-failure, then the microcomputer 7 outputs an on signal of the triac 12a to the trigger pulse generating circuit 8 for t2 time (step 3). At this time, the microcomputer 7 confirms that the current Io flows through the current detection resistor 37, thereby recognizing that the triac 12a is not an off failure (step 4). If the triac 12a is not off-failure, then the microcomputer 7 outputs an on signal of the triac 12b to the trigger pulse generation circuit 8 for t3 time. At this time, by confirming that the current Io flows from the microcomputer 7 to the current detection resistor 37, it is recognized that the triac 12b is not an off failure (steps 5 to 7). If the current reaches Imax during the failure verification, it is determined that the triac 12a or 12b is short-circuited, and a stop signal is output to the trigger pulse generation circuit 8 to stop the trigger signal 9 of the triac 12. Further, a relay drive signal is transmitted to the relay drive circuit 38a, the relay contact 38b is opened, and energization to the single-phase induction motor 2 and the triac 12 is stopped (steps 8 to 10). With the above failure diagnosis, it is possible to detect an on or off failure of the triac 12. In the case of a washing machine, if there is no diagnosis and protection function as described above, the motor temperature rises due to overcurrent to the motor, and the thermal fuse is blown. By providing the above diagnosis and protection function, such a situation can be prevented, and further, the repair can be simplified by using only the control circuit.

  Still another example of the present invention will be described with reference to the drawings. In FIG. 28, 1 is a commercial power source, 2 is a single-phase induction motor, 3 is a capacitor, 12a is a triac for energizing the forward rotation side winding of the single phase induction motor 2, and 12b is an energization for the reverse rotation side winding. Triac to be performed, 9a is a triac drive pulse signal for forward rotation of the single-phase induction motor 2 that drives the triac 12a, 9b is a triac drive pulse signal for reverse rotation of the single-phase induction motor 2 that drives the triac 12b, 7 is a microcomputer, 40 is a forward / reverse switching signal output from the microcomputer 7 to switch the energization to the triacs 12a and 12b, 41 is a timing signal output from the microcomputer 7 to determine the generation timing of pulses for driving the triacs 12a and 12b, 8 is a forward / reverse switching signal 40 from the microcomputer 7. Trigger pulse generating circuit inputs a fine timing signal 41, and outputs a triac driving signals 9a and 9b, 5 is a control circuit composed of a microcomputer 7 and a trigger pulse generating circuit 8. That is, the microcomputer 7 is provided with an output port for determining energization timing to the main coil and auxiliary coil of the motor, and an output port for switching energization of the main coil and auxiliary coil, and transmits the signal via the timing signal. Thereby, the timing of simultaneous energization to the main coil and the auxiliary coil is eliminated.

  FIG. 30 shows a conventional control circuit. 7 is a microcomputer, 42 is a forward rotation timing signal that is output from the microcomputer 7 and sets the energization timing to the triac 12a, and 43 is a reverse rotation timing signal that is output from the microcomputer 7 and sets the energization timing to the triac 12b. , 8 is a trigger pulse generation circuit for inputting the forward rotation timing signal 42 and the reverse rotation timing signal 43 from the microcomputer and outputs the triac drive signals 9a and 9b, and 5 is composed of the microcomputer 7 and the trigger pulse generation circuit 8. Control circuit. That is, the microcomputer is provided with each output port for determining the energization timing to the main coil and auxiliary coil of the motor, and sends a signal through each wiring.

  Next, the operation of this embodiment will be described. FIG. 29 is a timing chart showing the time relationship among the forward / reverse switching signal 40, the timing signal 41, and the motor current I flowing through the forward and reverse windings. In FIG. 28, when the single-phase induction motor 2 is rotated in the forward direction, the microcomputer 7 outputs a forward / reverse switching signal 40 to the trigger pulse generation circuit 8. The forward / reverse switching signal at this time becomes Hi as shown in FIG. Next, the drive timing of the triac 12 is determined, the timing signal 41 is output, the triac drive pulse signal 9a is output from the trigger pulse generation circuit 8 to the triac 12a, and the timing signal shown in FIG. 29 is output in pulses. . The triac 12a is turned on, and the single-phase induction motor 2 rotates forward. At this time, the forward current of the motor flows as shown in FIG.

  When the single-phase induction motor 2 is rotated in the reverse direction, the microcomputer 7 outputs a forward / reverse switching signal 40 to the trigger pulse generation circuit 8. The forward / reverse switching signal 40 at this time becomes Lo as shown in FIG. Next, the drive timing of the triac 12 is determined, the timing signal 41 is output, the triac drive pulse signal 9b is output from the trigger pulse generation circuit 8 to the triac 12b, and the timing signal shown in FIG. 29 is output in pulses. . The triac 12b is turned on, and the single-phase induction motor 2 rotates in the reverse direction. The reverse rotation current of the motor at this time flows as shown in FIG.

  Next, the operation of the conventional example shown in FIG. 30 will be described. FIG. 31 is a timing chart showing the time relationship among the forward rotation timing signal 42, the reverse rotation timing signal 43, and the current waveform flowing through the forward and reverse windings. 30, when the single-phase induction motor 2 is rotated in the forward rotation direction, the microcomputer 7 determines the drive timing of the triac 12a and outputs the forward rotation timing signal 42 to the trigger pulse generation circuit 8. Next, the triac drive pulse signal 9a is output from the trigger pulse generation circuit 8 to the triac 12a, the timing signal shown in FIG. 31 is output as a pulse, the triac 12a is turned on, and the single-phase induction motor 2 rotates forward. . The forward current of the motor at this time flows as shown in FIG.

  When the single-phase induction motor 2 is rotated in the reverse rotation direction, the microcomputer 7 determines the drive timing of the triac 12 b and outputs the reverse rotation timing signal 43 to the trigger pulse generation circuit 8. Next, the triac drive pulse signal 9b is output from the trigger pulse generating circuit 8 to the triac 12b, the timing signal shown in FIG. 31 is output as a pulse, the triac 12b is turned on, and the single-phase induction motor 2 rotates in reverse. . The reverse rotation current of the motor at this time flows as shown in FIG.

  Here, in the case of the conventional circuit configuration shown in FIG. 30, when the microcomputer 7 runs out of control or the like, the output port of the microcomputer 7 often keeps Hi or Lo. When the output port continues to become Hi at the same time, the trigger pulse generating circuit generates a signal for simultaneously driving the triacs 12a and 12b, an excessive current flows to the single-phase induction motor 2 and an abnormal temperature rises. There were problems such as the temperature fuse inside being blown.

  However, in the case of the circuit configuration shown in FIG. 28, the trigger pulse generation circuit generates a signal for driving the triac 12a even when the output port continues to be Hi simultaneously when the microcomputer 7 runs out of control. As in the conventional circuit configuration of FIG. 30, an excessive current flows to the single-phase induction motor 2 to cause an abnormal temperature rise, so that a problem such as a thermal fuse in the motor fusing does not occur. Conversely, even if the output port continues to be Lo at the same time, there is no simultaneous ON. The above-described protection procedure is shown in FIG. 32 (steps 1 to 5). Both triacs do not turn on at the same Hi or Lo on the microcomputer port. In the case of a washing machine, if there is no function as described above, the motor temperature rises due to overcurrent to the motor, and the thermal fuse is blown. By providing the above function, such a situation can be prevented, and further, the repair can be easily performed only with the thermal fuse. Further, the display may be provided as described above. The present invention stops energization of the motor when it is determined that 100% energization has passed an arbitrary time while driving the motor of 60 Hz power source.

  In the present invention, PI control is performed based on the detected rotational speed and command value, and an initial value other than zero is set for the integral term of this PI control.

  Further, according to the present invention, the initial value of the integrated value of PI control is set according to the load amount.

  Further, according to the present invention, the initial value of the integrated value of PI control is set according to the target rotational speed of the motor.

  Further, according to the present invention, when it is determined that 100% energization has passed an arbitrary time while driving a 60 Hz power source motor, energization to the motor is stopped.

  In the present invention, when the motor is rotated by a 60 Hz power source and a certain number of rotations exceeding the maximum number of rotations at the time of the power source 50 Hz is detected, the energization to the motor is stopped.

  The present invention also stops energization of the motor when the motor continues to operate at a certain rotational speed or less and above a certain current value.

  Further, according to the present invention, when the current flowing through the coil is detected when the phase control is not energized, or when a current greater than a certain current when the phase control is energized is detected, the energization to the motor is stopped.

  Further, according to the present invention, the energization of the motor is stopped by opening and closing the main circuit.

  Further, according to the present invention, when generating a trigger pulse for driving the motor, a signal for determining the energization timing of the motor coil and a signal for switching the energization of the coil are separately transmitted.

  In the present invention, there is no timing for simultaneously energizing a plurality of coils of the motor.

  The washing machine of the present invention is equipped with a highly reliable motor control device.

  Moreover, the washing machine of this invention can display the information regarding a motor stop.

  As described above, according to the present invention, the driving pulse signal for energizing the motor is such that the ignition timing is long near the zero cross signal of the power supply and short at other timings. Even if the phase is ahead of the phase of the power supply, the triac can be reliably fired, and a highly reliable device can be obtained. The pulse signal of the present invention is a plurality of pulse train signals, and a device with low power consumption can be obtained.

  Further, according to the present invention, the output timing of the drive pulse signal for energizing the motor is normalized using the time between the power supply zero cross signals and is calculated using the normalized data. Even if they are different, since they can be processed by the same routine in the microcomputer, it is possible to shorten the program and calculation time. In addition, the present invention is always normalized, so that even if the power supply is suddenly switched, no operation is required.

  Further, according to the present invention, the output timing of the driving pulse signal for energizing the motor can be varied before and after the target output timing time when controlled to the target rotational speed. The vibration frequency also fluctuates due to the fluctuation of the noise, and it is possible to prevent the generation of a specific annoying sound. Further, the present invention can be used for a wide range of purposes without impeding the application of the apparatus using the motor because the average of the output timing substantially coincides with the target value.

  In addition, according to the present invention, since the energization stop to the motor driving unit described above is performed by stopping the output signal, a highly reliable device can be obtained.

  Further, according to the present invention, the energization stop to the motor drive unit described above is performed in combination with the opening and closing of the circuit.

  In addition, since the present invention is configured such that a plurality of coils of the motor are not energized at the same time, a control device with high operation reliability can be obtained.

  The present invention also provides a washing machine that is highly reliable and easy to use.

It is a block diagram which shows the control apparatus of the single phase induction motor by one Example by this invention. It is explanatory drawing which shows the triac ignition timing in the phase control of this invention, and the voltage and electric current of a motor. It is explanatory drawing which shows the triac ignition timing in the phase control of this invention, and the voltage and electric current of a motor. It is explanatory drawing which shows the triac ignition timing in the phase control of this invention, and the voltage and electric current of a motor. It is a flowchart which shows the procedure which determines the pulse width of this invention. It is a flowchart which shows the triac ignition position calculation routine of this invention. It is a flowchart which shows the procedure of the zero crossing signal time measurement of this invention. It is a flowchart which shows the procedure of the power supply frequency discrimination | determination of this invention. It is a motor control block diagram by PI control of this invention. It is a flowchart which shows the calculation routine of PI control of this invention. It is explanatory drawing which shows the integral term data of PI control according to the load amount of the motor of this invention. It is explanatory drawing which shows a motor rotation state when zero is set to the integral term of PI control of this invention. It is explanatory drawing which shows a motor rotation state when initial value other than zero is set to the integral term of PI control of this invention. It is explanatory drawing which shows the integral term data of PI control according to the target rotation speed of the motor of this invention. It is explanatory drawing which shows a motor rotation state when zero is set to the integral term of PI control of this invention. It is explanatory drawing which shows a motor rotation state when initial value other than zero is set to the integral term of PI control of this invention. It is explanatory drawing which shows the output timing of the power supply zero cross signal of this invention, and a triac drive pulse signal. It is explanatory drawing which shows time distribution until a triac drive pulse signal is output from the power supply zero cross signal of this invention. It is explanatory drawing which shows time distribution until a triac drive pulse signal is output from the power supply zero cross signal of this invention. It is explanatory drawing which shows the time change of the motor rotation speed of this invention. It is a block diagram which shows the control apparatus of the single phase induction motor by one Example by this invention. It is explanatory drawing which shows the time change of the motor rotation speed of this invention. 1 is a structural diagram showing the structure of a washing machine of the present invention. It is explanatory drawing which shows the time change of the motor rotation speed of this invention, and an electric current. It is a flowchart which shows the procedure of protection of this invention. It is explanatory drawing which shows the time change of the on / off timing of the triac of this invention, and the motor current at that time. It is a flowchart which shows the procedure of protection of this invention. It is a block diagram which shows the control circuit of the single phase induction motor by one Example by this invention. It is explanatory drawing which shows the time change of the forward / reverse switching signal of the motor of this invention, the timing signal at the time of a triac drive, and the electric current which flows through a motor. It is a block diagram which shows the control circuit of the conventional single phase induction motor compared with this invention. It is explanatory drawing which shows the time change of the triac drive timing signal which makes the conventional motor compared with this invention forward or reverse, and the electric current which flows through a motor. It is a flowchart which shows the procedure of protection of this invention. It is a block diagram which shows the control apparatus of the conventional single phase induction motor.

Explanation of symbols

  1 commercial power supply, 2 single-phase induction motor, 3 capacitor, 4 rotation speed detector, 5 control circuit, 6 zero cross detection circuit, 7 speed calculation unit, 8 trigger pulse generation circuit, 37 current detection resistor, 38b relay contact.

Claims (6)

Motor, rotation speed detection means for detecting the rotation speed of the motor, motor drive means for driving the motor by controlling the phase for both 50 Hz / 60 Hz, and a zero cross signal for energizing the motor, and determining the power frequency When the power frequency is determined to be 60 Hz by the power frequency determining means and the motor driving means is driven by the motor driving means based on the output signal and the speed command value of the rotational speed detecting means, A motor comprising: determination means for determining that an arbitrary time has passed in a 100% energized state; and energization stopping means for stopping an energization current to the motor based on the determination of the determination means. Control device. Motor, rotation speed detection means for detecting the rotation speed of the motor, motor drive means for driving the motor by controlling the phase for both 50 Hz / 60 Hz, and a zero cross signal for energizing the motor, and determining the power frequency Power supply frequency determination means, and energization stop means for stopping energization from the power supply to the motor drive means, and the power supply frequency determination means determines that the power supply frequency is 60 Hz and the rotation speed detection means detects A motor control device that stops energization of the motor when the rotation speed exceeds the maximum rotation speed at the power frequency of 50 Hz. A motor, a rotation speed detection means for detecting the rotation speed of the motor, a motor drive means for driving the motor by performing phase control with a triac so that the motor can be rotated forward and backward, and a current detection unit for detecting a current flowing through the motor Energization stopping means for stopping energization from the power source to the motor driving means, and diagnostic means for diagnosing a failure of the triac based on detection values detected by the rotation speed detection means and the current detection unit, A current value detected by the current detection unit when the current is detected by the current detection unit at the time of non-energization of phase control to the motor coil by the diagnostic means , or when the current detection unit detects the current at the time of phase control energization to the coil A motor control device characterized by stopping energization of the motor when a value equal to or greater than the value is detected . 3. The energization stop means is performed by opening and closing a square rooting device provided in a circuit from a power source to a motor, and a triac for phase control of the motor is provided for forward rotation and reverse rotation, respectively. 3. The motor control device according to 3 . A washing machine comprising at least one of the motor control devices according to claim 1. 4. A washing machine equipped with at least one of the motor control devices according to claim 1 and capable of displaying information relating to motor stop.

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