JP3598481B2 - Vacuum cleaner input control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an input control device for a vacuum cleaner that controls input power of a motor to be constant by controlling the phase of a suction motor and detecting current.
[0002]
[Prior art]
2. Description of the Related Art An input control device for a vacuum cleaner of this type is disclosed in Japanese Patent Application Laid-Open No. 5-95877. This is intended to keep the input of the electric blower constant at all times in order to solve the problem that the input of the electric motor is maximized and the power is consumed without permission when the air inlet is operating in the air. The control means includes a current detection means for detecting a current of the electric blower, an amplification means for the output, and a phase control means for controlling the number of revolutions of the electric blower. The phase control means has a signal level from the amplification means. It is realized by controlling it to be constant.
[0003]
Japanese Patent Application Laid-Open No. 7-213468 has a configuration in which voltage detecting means is provided in addition to the above-described configuration, and the phase control means is controlled so that the signal level of the current detecting means becomes constant in accordance with power supply voltage fluctuation. Further, in Japanese Patent Application Laid-Open No. Hei 7-313415, it is possible to realize control for keeping the input power of the motor constant by constant current control or constant phase angle control in substantially the same configuration.
[0004]
FIG. 18 illustrates the relationship between the current value of the suction motor and the input power in a general vacuum cleaner, showing the control characteristics when the air volume (the amount of dust) is plotted on the horizontal axis. FIG. 18A shows the characteristics when the motor applied voltage is constant (uncontrolled). Naturally, the current value and the input power value maintain a proportional relationship, and the current value and the current value increase in the direction in which the air volume is reduced (dust accumulates). Both input power values drop.
[0005]
FIG. 18B shows a case where the current constant control is performed by the phase control up to the predetermined air volume. In the phase control, a constant current can be realized by increasing the phase firing time (hereinafter, referred to as a phase angle) on the large air flow (release) side. However, when the phase angle increases, the effective voltage and the effective current decrease, and the power factor deteriorates. Therefore, the current value and the input power value do not have a proportional relationship, and the phase angle decreases (the air volume decreases) and the input power value decreases. Rises. In other words, this indicates that the input power is not constant when the constant current control is performed.
[0006]
Further, in the constant phase angle control by the phase control, since the motor applied voltage is constant, the characteristic becomes the same as the characteristic (a) in the figure, which also indicates that the constant input power control cannot be realized.
There is a prior application example disclosed in Japanese Patent Publication No. 2-30683 for detecting the air volume. According to this, the input control of the motor can be performed without directly detecting the air volume by using the pressure sensor for detecting the negative pressure between the filter and the fan and the motor current detecting means.
[0007]
[Problems to be solved by the invention]
Since the conventional input control device for a vacuum cleaner is configured as described above, there are the following problems. First, in the reference using the motor current detecting means, the constant current control and the constant phase angle control are performed by the output of the current detecting means. However, in this method, it is difficult to keep the input power constant because of the characteristics of the phase control. The input power varies depending on the amount of dust and the state of the surface to be cleaned, and the input power of the motor may exceed the regulation depending on conditions. Therefore, it is difficult to keep the input power constant even if the correction is performed by the power supply voltage.
[0008]
In addition, in the reference in which a pressure sensor is added for detecting the air volume in addition to the current sensor, the number of parts increases, the cost increases, and the configuration becomes larger, as a matter of course. In addition, there is another problem that the accuracy adjustment and the process for dealing with the cause of failure are complicated by the increase in the number of sensors, and the assembling workability is deteriorated.
[0009]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can perform constant control of input power, can operate efficiently regardless of the amount of dust and the state of a surface to be cleaned, and can achieve durability. It is an object of the present invention to obtain an input control device for a vacuum cleaner having a high level.
[0010]
[Means for Solving the Problems]
An input control device for a vacuum cleaner according to the present invention includes a current detection unit that detects a current flowing through a motor,A target formed by connecting current values at which input power is constant for multiple airflow current characteristics corresponding to the phase angle with the airflow as a parameterBased on current characteristics, Corresponding to a predetermined phase angleCharacteristic calculating means for calculating a target current value;,When the detected current values detected by the current detecting means are not equal,the aboveDetection current valueEstimate the air flow current characteristics passing through, the intersection of the estimated air flow current characteristics and the target current characteristicsPhase angle scanning means for calculating a phase angle, and phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means.
[0011]
Also,An input control device for a vacuum cleaner according to the present invention includes:Current detection means for detecting a current flowing through the motor,A target formed by connecting current values at which input power is constant for a plurality of airflow current characteristics corresponding to the phase angle with the airflow as a parameterBased on current characteristics, Corresponding to a predetermined phase angleA characteristic calculating means for calculating a target current value, and calculating a phase angle obtained by subtracting a phase angle of a predetermined width from the predetermined phase angle when the target current value is larger than the detected current value detected by the current detecting means. When the target current value is smaller than the detected current value, a phase angle scanning means for calculating a phase angle obtained by adding a phase angle of a predetermined width to the predetermined phase angle, and the phase calculated by the phase angle scanning means Phase control means for controlling the input power of the motor based on the angle,The phase angle scanning means and the phase angle control means repeat until the detected current value matches a current value on the target current characteristic..
[0012]
Also,PredeterminedEquation for approximating target current characteristics in the phase angle range ofRepresented byThings.
[0013]
In addition, a target current value corresponding to the phase angle calculated by the phase angle scanning means and, Air volume aboveAn air volume calculation unit for deriving the air volume based on the current characteristics is provided.
[0014]
Further, a voltage detecting means for detecting the voltage of the power supply, and a first mathematical expression for correcting the output of the characteristic calculating means based on the voltage detected by the voltage detecting means, and inputting the corrected output to the phase angle scanning means Means.
[0015]
Further, an EEPROM for detecting the current output of the current detection means by the current output inspection means and storing the detection result,, InspectionA second mathematical expression changing means for correcting the output of the characteristic calculating means based on the output current output and inputting the corrected output to the phase angle scanning means.
[0016]
Further, a motor characteristic detecting means for detecting a motor characteristic, and a predetermined phase angle range output from the characteristic calculating means based on the motor characteristic value detected by the motor characteristic detecting means are corrected and input to the phase angle scanning means. A phase angle range correcting unit;
[0017]
Also,The input control device of the vacuum cleaner according to the present invention,Current detection means for detecting a current flowing through the motor,For a plurality of airflow current characteristics corresponding to the phase angle with the airflow as a parameter, the target current characteristics formed by connecting the current values at which the input power is constantPredeterminedPhase angle rangeAn EEPROM storing an approximate expression of a target current characteristic and the predetermined phase angle range; an arithmetic operation means for calculating a target current value based on the approximate expression and the predetermined phase angle range stored in the EEPROM; Target current value and,When the detected current values detected by the current detecting means are not equal,the aboveDetection current valueIs estimated, and becomes an intersection of the estimated airflow current characteristic and the approximate expression of the target current characteristic.Phase angle scanning means for calculating a phase angle, and phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is a characteristic diagram of air flow, current and input power of a suction motor, and FIG. 4 is a basic characteristic diagram showing an angle-input power characteristic, FIG. 4 is a basic characteristic diagram showing a phase angle-current characteristic, FIG. 5 is a partially enlarged explanatory diagram of FIG. 4, FIG. 6 is an operation flowchart, and FIG. FIG. 4 is an input power characteristic diagram obtained by the input control device.
[0019]
In FIG. 1, reference numeral 1 denotes a commercial AC power supply, 2 denotes a suction motor connected to the commercial AC power supply 1 via a bidirectional thyristor 3, and 4 denotes current detection means for detecting a current flowing through the suction motor 2. The current sensor 4a is configured in series with the suction motor 2, and is detected as a voltage by a voltage drop method using a current transformer or a shunt resistor. Reference numeral 5 denotes a power supply unit generated from the commercial AC power supply 1, which is used for a DC power supply or the like of a microcomputer 6 or the like which controls a vacuum cleaner, and has a commercial frequency zero-cross detection circuit unit therein.
[0020]
Numeral 7 is a basic characteristic obtained in advance by an experiment or the like and shown in FIGS. 3 and 4. This is because the input power characteristic (measured by a measuring device not shown) and the current characteristic (measured by the current detecting means 4) when the suction motor 2 is controlled by changing the phase angle by the phase control means 12 described later in detail. 8 is a phase angle vs. target current characteristic derived from the basic characteristic 7 to keep the input power constant, and is shown in FIG. 4 and FIG. 4 and 5 will be described later.
[0021]
Numeral 9 stores the phase angle versus target current characteristic 8 as a characteristic data table or an approximate expression derived from the characteristic data table, and characteristic calculating means 10 for calculating a target current value at an initial phase angle. The phase firing time (hereinafter referred to as phase angle) is increased or decreased based on the result of comparison between the output of the means 9 and the output of the current detection means 4 and the input power value input via the A / D converter 11. It is a phase angle scanning means. It should be noted that there are two types, a method of switching the increase / decrease amount once toward the derived target phase angle and a method of fixing the increase / decrease amount to reach the target in a plurality of times.
The scanning width of the phase angle scanning means 10 is set to a predetermined time by a timer or the like.
[0022]
Reference numeral 12 denotes a phase control means which operates by obtaining the output of the phase angle scanning means. The phase control is executed by feeding back the phase angle to the gate of the bidirectional thyristor 3 and the characteristic calculation means 9 also outputs the current phase angle value. Feedback. It should be noted that a reference point having a phase angle of 0 is given to this phase control means by inputting an output from the zero-cross detection means 5a via the counter 13. The microcomputer 6 is provided with these characteristic calculating means 9, phase angle scanning means 10, A / D 11, phase control means 12, and counter 13.
Reference numeral 14 denotes a switch unit, which inputs operation contents such as input switching and start / stop to the microcomputer 6. Reference numeral 15 denotes a display unit for outputting various information such as operation contents.
[0023]
Next, the contents of the basic characteristic 7 and the phase angle versus target current characteristic 8 will be described with reference to FIGS. 2, 3, and 4 based on actual experimental results.
FIG. 2 is a characteristic diagram of the air flow, the current, and the input power of the suction motor. The solid line indicates the current, and the dotted line indicates the input power. In the figure, in order to realize the constant input power control, it is sufficient to set a target current that slightly decreases as the air flow is reduced. The target current is set according to the air flow (depending on the air path configuration) and the motor characteristics. Therefore, it is necessary to make settings corresponding to the type of the vacuum cleaner, and at the same time, to clarify the value of the air volume.
For this purpose, the respective characteristics shown in FIGS. 3 and 4 were obtained by experiments.
[0024]
FIG. 3 shows the phase angle-input power characteristic of the first basic characteristic. The horizontal axis shows the phase angle T (firing angle time) (0 to several milliseconds), and the vertical axis shows the input power W. For the sake of explanation, the characteristics using a 1300w motor are shown. In addition, five kinds of parameters, from the air volume of 100% (zero dust) to the air volume of d% (large dust), are described using the air volume as a parameter.
[0025]
A phase angle of 0 indicates a 100% energized state, and indicates an input power of about 1300 W at a flow rate of 100%. The input power decreases as the phase angle increases. Further, even at the phase angle 0, the input power drops in the direction in which the air volume is reduced. Also, as the air volume increases, the rate at which the input power drops as the phase angle increases increases. For example, if three types of WH, WM, WL are set (horizontal lines) as target input power values, corresponding to each set input power from the intersection of the set input power, the air volume of 100% (dust zero) and the air volume d% (dust large). The predetermined phase angle ranges TH, TM, and TL are obtained. In this way, it is possible to derive the phase angle corresponding to the input power set as the target and the respective airflow.
[0026]
FIG. 4 shows the phase angle-current characteristic of the second basic characteristic. As for the electric current, the output of the current detecting means 4 is shown on the vertical axis, and the phase angle on the horizontal axis and the air volume parameter are the same as those in FIG.
When the predetermined phase angle ranges TH, TM, TL derived in FIG. 3 are indicated on the horizontal axis, and the intersections of this phase angle and the respective airflows are plotted, the target input powers WH, WM, WL shown in FIG. Correspondingly, the current at which the input power at each air volume is constant is indicated by Htw, Mtw, and Ltw. When the constant current control is performed by the phase control as described with reference to FIG. 18B showing the related art, the input power and the current value do not have a proportional relationship, and therefore, the same tendency as the input power characteristic is shown, However, the phase angle-current characteristics are substantially straight lines different from each other and rising to the right.
[0027]
As described above, the result of deriving the relationship between the phase angle and the current value indicated by the substantially straight lines Htw, Mtw, and Ltw is the phase angle versus target current characteristic 8 in the predetermined phase angle ranges TH, TM, and TL. In order to obtain the target input powers WH, WM, WL, the phase control may be performed so that the relationship between the phase angle and the current value becomes Htw, Mtw, Ltw. The processing is performed by the computer 6.
[0028]
Next, the operation will be described with reference to FIG. 1, FIG. 2, FIG. 5, FIG. 6, and FIG.
FIGS. 6A and 6B are operation flowcharts using the target input power WL 1 as an example. FIG. 6A is related to the first invention, and FIG. 6B is related to the second invention. FIG. 5 is a characteristic explanatory view of the phase angle vs. target current characteristic 8 (FIG. 4) in a partially enlarged manner.
[0029]
First, FIG. 6A will be described.
In step S100, an initial phase angle TLS stored as an initial value for the input power WL is set in the phase angle scanning means 10 as an initial phase angle value at power-on. As the initial phase angle, as shown in FIG. 5, for example, an initial phase angle TLS is set with respect to the target current characteristic Ltw, using, for example, the air volume a as a guide.
[0030]
In step S101, the suction motor 2 is phase-controlled by the phase control means 12 and the bidirectional thyristor 3 based on the phase angle initial value set in step S100.
In step S102, the current flowing through the motor in step S101 is detected by the current detection unit 4, and the current Vout detected by the current detection unit 4 is sent to the phase angle scanning unit 12 via the A / D conversion unit 11.
[0031]
At the same time, in step S103, the characteristic calculating means 9 calculates an intersection VLS (target current value) of the target current characteristic Ltw and the initial phase angle TLs from the target current characteristic Ltw, and sends it to the phase angle scanning means. FIG. 5 shows an example in which the target current value VLS matches on the curve of the air volume a.
[0032]
Next, in step S104, the detected current value Vout is compared with the target current value VLS by the phase angle scanning means 10, and if the values are equal, the process returns to the phase control operation S101; if not, the process proceeds to step S105.
[0033]
In the example shown in FIG. 5, Vout shown in FIG. 5 is output because the air volume (b) is lower than the standard air volume (a) due to dust accumulation or the like, and VLS> Vout in this state. The phase is controlled with the input power being low with respect to the input power WL.
In this case, the process proceeds to step S105, which is a loop for obtaining the target phase angle TLout.
[0034]
In addition, when the operation is performed with the air volume (b) lower than the standard air volume (a) due to accumulation of dust or the like as in this example, the air volume cannot be immediately returned to the air volume a, but the wind is rapidly absorbed by a curtain or the like. When the road is narrowed, the air volume returns to a when the curtain is released from the suction port.
[0035]
In step S105, the phase angle scanning means 10 estimates the air volume characteristic curve (air volume b in the example of FIG. 4) passing above the value of Vout based on the value of Vout, and calculates the estimated air volume characteristic curve and the target current characteristic Ltw. The intersection point VL is calculated, and the target phase angle that satisfies this VL is calculated.T Lout(The intersection with the horizontal axis obtained by drawing a vertical line from VL).
[0036]
In step S106, the phase angle scanning means 10 sets the phase angle calculated in step S105 (S106), returns to the phase control operation S101, and repeats steps S101 to S106, thereby setting the phase angle almost once. As a result, VLS (VL) = Vout, and the target input power value WL is obtained.
As described above, FIG. 6A shows a method of switching the phase angle once. As a method of calculating the target phase angle Tout, the target Vout is set to coincide with the target current characteristic Ltw line. The intersection point VL of Ltw and the air volume b is obtained, and the target phase angle TLout is obtained from this point. If the phase control operation is performed at TLout in the next control cycle, the target input power WL can be obtained.
[0037]
The timing of this repetition loop is set to a predetermined timing time by the counter 13 receiving the output of the zero-crossing detecting means 5a, so that a process can always be performed in response to a change in the amount of dust or a change in the state of the surface to be cleaned. Become.
[0038]
Next, FIG. 6 (b) shows an operation by switching a plurality of phase angles, and the figure will be described below.
[0039]
Steps S100 to S104 are the same as the operations in FIG.
In step S107, when VLS is not equal to Vout, the magnitudes are compared. If VLS> Vout, the process proceeds to step S108, and if VLS> Vout, the process proceeds to step S109.
[0040]
In step S108, as shown in FIG. 5, a phase angle obtained by subtracting a phase angle of a predetermined width from the initial phase angle TLS is set, scanning is performed in a direction to increase the input power, and the process returns to step S101.
By repeating this operation a plurality of times, a target input power value WL 2 is obtained.
[0041]
In the example shown in FIG. 5, Vout = VLS (VL) is satisfied for the third time, and the target input WL is obtained.
[0042]
In step S109, a phase angle obtained by adding a phase angle of a predetermined width to the initial phase angle TLS is set, scanning is performed in a direction to reduce the input power, and the process returns to S101.
By repeating this operation a plurality of times, a target input power value WL 2 is obtained.
[0043]
As described above, in the multiple switching method, the phase angle is increased / decreased by the scanning width of the phase angle having a predetermined width, and by repeating this plural times, the target input power WL 2 is settled to TLout where VL and Vout become equal. Things.
[0044]
The phase angle (scan width) of the predetermined width depends on the clock of the microcomputer 6, but it is desirable to set the phase angle of the width based on the minimum time.
[0045]
As described above, in each of the methods shown in FIGS. 6A and 6B, basically, the intersection of the target current characteristic (Ltw) and the initial phase angle (TLS) is the target current, The phase angle is automatically scanned so that the target current (VLS) matches the detected current (Vout).
[0046]
The method of obtaining the intersection point VLS of the phase angle TLS and the target current characteristic Ltw is a method of obtaining a correspondence table (table) from the characteristics of FIGS. There is a method to ask.
[0047]
3 and 4, plotting the intersection points of the phase angles of the predetermined phase angle ranges TH, TM, and TL and the respective air volumes in FIGS. 3 and 4 correspond to the target input powers WH, WM, and WL. The current characteristics at which the input power at each air flow is constant are indicated by Htw, Mtw, and Ltw.
[0048]
These current characteristics Htw, Mtw, and Ltw are substantially straight lines rising to the right and can be expressed as a first-order approximate expression such as y = ax + b.
Here, y is a current value output from the current detecting means 4, x is a phase angle, and a and b are constants.
[0049]
For example, from the experimental results, when the input power is 1150 W,
y = 0.002x + 3.83
Is obtained, and based on this, the intersection VLS of the phase angle TLS and the target current characteristic Ltw can be obtained.
[0050]
FIG. 7 shows an example of the input power characteristic obtained according to the first embodiment. The horizontal axis represents the air volume, and the vertical axis represents the input power. The target input power WL from 100% to the air volume a shown in the air volume parameter characteristics, the target input power WM from the air volume a to the air volume b, and the air volume d from the air volume b Up to the case where the target input power WH and three levels are allocated. As shown in the figure, it was confirmed that constant input power could be obtained for each of the three types of target input powers WL 1, WM 2, and WH. The air volume is approximately 1.35m³The range of / min or less is a full energization (phase angle 0) region.
[0051]
As described above, a constant input power can be reliably achieved for each of a plurality of target input powers, the input power and the air flow can be efficiently controlled according to the amount of dust and the surface to be cleaned, and a pressure sensor is used. Therefore, cost reduction, durability improvement, and assembly workability improvement can be achieved.
[0052]
In addition, in the one-time switching method, a target phase angle can be immediately determined to obtain a target input power in order to calculate and obtain an intersection VL between Ltw and the air volume b.
[0053]
In addition, in the multiple switching method, since the phase angle is increased or decreased while scanning every predetermined width of the phase angle, an inrush current due to a sudden change in the phase angle can be prevented, and a smooth input power transition and excellent quietness can be achieved. The apparatus can be obtained, and the program can be simplified because the means for calculating the target phase angle is unnecessary.
[0054]
In addition, since the calculation means is an approximate expression that is mathematically expressed as the target input power characteristic based on the characteristics obtained in advance, when there are a plurality of target input power characteristics, the load on the microcomputer program capacity is reduced with respect to the table mapping method, thereby reducing cost. can do. Further, even if the air volume characteristic deviates from the reference value due to the power supply voltage fluctuation, the motor characteristic fluctuation, and the current sensor accuracy fluctuation, the entire air volume characteristic region can be covered by the mathematical expression, so that stable and suitable input control can be performed.
[0055]
Embodiment 2
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
FIG. 8 is a functional block diagram of the input control device of the electric vacuum cleaner according to the second embodiment, and FIG. 9 is a characteristic explanatory diagram. In FIG. Is omitted. In FIG. 8, reference numeral 16 denotes an air volume calculation unit that receives the output of the phase angle scanned and determined by the phase angle scanning unit 10 and derives the air volume from the relationship with the currently set target input characteristic. 12 and the display unit 15.
[0056]
Next, the operation will be described. In FIG. 9, for example, when the phase angle TLout is output from the phase angle scanning means 10 during operation with the target current characteristic Ltw, the air volume parameter that intersects the intersection VL of TLout and Ltw represents the air volume at this time. .
[0057]
The air volume calculation means 16 calculates the distance between the intersection a of the known air volume a and the target current characteristic Ltw and the intersection VL, and the distance between the intersection b between the air volume b and the target current characteristic Ltw and VL. Based on this, the air volume at the phase angle determined by scanning by the phase angle scanning means 10 is calculated. A dotted line passing through the intersection VL is a calculated air volume characteristic.
[0058]
On the basis of the calculated air volume information, for example, when an abnormal use such as a closed operation is performed, the phase control unit 12 generates and outputs motor stop information or a phase angle for switching to a weak operation. Also, during normal operation, it is possible to output and display air volume information and dust amount information on the display unit 12.
[0059]
As described above, for example, in the event of an abnormality such as a closed operation, control for switching to motor stop information or weak operation can be performed without using a pressure sensor or the like, and durability can be improved.
[0060]
Further, during normal operation, air volume information and dust volume information can be output and displayed on the display unit 12 without using a pressure sensor or the like, and cost reduction, durability improvement, and assembly workability improvement are achieved. be able to.
[0061]
Embodiment 3
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a functional block diagram of an input control device for a vacuum cleaner according to a third embodiment, and FIG. 11 is a characteristic explanatory diagram. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals and are described. Is omitted. In FIG. 10, reference numeral 17 denotes power supply voltage detecting means for detecting the voltage of the commercial AC power supply 1, which can be realized, for example, by monitoring the primary or secondary voltage of the transformer constituting the power supply unit 5. Reference numeral 18 denotes a first mathematical expression correcting unit that receives the output of the power supply voltage detecting unit 17 and corrects / changes the output of the characteristic calculating unit 9. The corrected / changed output is input to the phase angle scanning unit 10.
[0062]
Next, the operation will be described with reference to FIG.
For example, when the power supply voltage is 100 V and the operation is performed with the target current characteristic Ltw, when the phase angle TLS is output from the phase angle scanning unit 10, the intersection point a of the TLS and Ltw is detected by the current detection unit 4 and the target input power Drive with Here, it has been confirmed by an experiment that when the voltage is 105 V, the air volume characteristic becomes higher than that at 100 V as shown by the dashed line in the figure. Therefore, at the time of TLS input, the current is detected at the point b, so that the operation of the first embodiment moves in the direction in which the phase angle increases (the direction in which the input power decreases), and the operation is stabilized at the point c on the target current characteristic Ltw. I do.
[0063]
However, since the voltage is 105 V to the last, it is operated with a high input power of about 5% increase from the relation of P = VI. Therefore, it is necessary to lower the target current to the point a. That is, in order to satisfy the intersection d between the air volume characteristic at the voltage of 105 V and the target current, the target current characteristic Ltw is moved downward by α.Need to be able toCorrected target current characteristics LtwhCalled.Specifically, it can be realized by performing a simple correction of changing the equation of Ltw = ax + b to Ltwh = ax + (b−α).
[0064]
The correction value α is a value obtained in advance by an experiment or the like and stored in the first equation changing means 18 using the power supply voltage fluctuation range as a parameter, and the target constant input power can be obtained by a simple correction process. Further, in this method, even if the target current characteristic is changed to the corrected target current characteristic, it is not necessary to change the initial input of the phase angle. For example, even if the phase angle TLS is input, the phase angle is increased so as to satisfy the intersection d between the corrected characteristic Ltwh and the airflow, and the operation is finally stabilized at the phase angle TLSH.
[0065]
As described above, the target constant input can be easily performed by correcting the power supply voltage, and the correction of the phase angle setting is not required. Therefore, the correction means does not become complicated, and an inexpensive configuration can be achieved.
[0066]
Embodiment 4
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a functional block diagram of an input control device for a vacuum cleaner according to the fourth embodiment, FIG. 13 is a current characteristic diagram, and FIG. 14 is an input characteristic diagram relating to air flow. Are denoted by the same reference numerals, and description thereof is omitted.
[0067]
In FIG. 12, reference numeral 19 denotes a motor characteristic detecting means for detecting characteristics such as armature resistance as the input power variation of the suction motor 2. For example, at the time of checking, the air volume is reduced in a pseudo manner, and the phase control is operated in the entire ignition range. The characteristic is detected by monitoring the output of the current detecting means 4 at the time (the characteristic is shown in FIG. 14). Reference numeral 20 denotes a phase control range correction means for receiving the output of the motor characteristic detection means 19 and correcting / changing the setting of the predetermined phase angle range of the characteristic calculation means 9. The output after correction / change is a phase angle scanning means. 10 is input.
[0068]
Next, the operation will be described with reference to FIGS. For example, when the armature resistance of the motor is operating with the target current characteristic Ltw as standard, when the phase angle TLS is output from the phase angle scanning means 10, the intersection point a of the TLS and Ltw is detected by the current detection means 4. Operate with the target input power. Here, it has been experimentally confirmed that, when the armature resistance is low due to manufacturing variations, a high current flows, so that the airflow characteristics become higher than the standard time as shown by the dashed line in the figure. Therefore, at the time of TLS input, the current is detected at the point b, and the operation of the first embodiment moves in the direction of increasing the phase angle (direction of decreasing the input power) TLSms and operates stably at the point c on the target current characteristic Ltw. I do.
[0069]
As a result, as shown in FIG. 14, the current value satisfies the target current characteristic, so that an operation that satisfies the target input power can be performed from the relationship of P = VI, as shown in FIG. However, for example, when the automatic operation is performed with the target current characteristic Mtw between the air volume a and the air volume b, a predetermined phase angle range (TL, TM in the figure) based on the standard motor is set and the phase angle is increased by an amount corresponding to the phase angle increase. Will be different. As a result, as shown in FIG. 14, the air volume at which the input power is switched shifts to the lower air volume side as the armature resistance is smaller.
[0070]
Therefore, upon receiving the output of the motor characteristic detecting means 19, the phase angle range correcting means 20 corrects the current predetermined phase angle ranges TM and TL as new ranges to TMS and TLS, respectively, and outputs the corrected values. You can keep the relationship.
[0071]
As described above, the relationship between the air volume and the target input power can be kept constant, an efficient suction force corresponding to the predetermined air volume can be obtained, and efficient operation can be performed.
[0072]
In FIG. 14, the difference in input power, that is, the difference in current in the entire firing range of the motor characteristic detecting means 19 described above can be clearly identified, so that the motor variation can be detected reliably.
[0073]
Embodiment 5
Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 15 is a functional block diagram of an input control device for a vacuum cleaner according to the fifth embodiment. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the figure, reference numeral 21 denotes an EEPROM in which a plurality of mathematical expressions determined by the phase angle vs. target current characteristic 8 and a plurality of switching values of a predetermined phase angle range are described. Numeral 22 is a mathematical operation means for receiving the value in the EEPROM 21 and performing an arithmetic operation on the mathematical expression. The output is passed to the phase angle scanning means 10.
[0074]
Next, the operation will be described. The formula calculating means 22 receives the approximation formulas of the target current characteristics Ltw, Mtw, and Htw described in the first embodiment and the contents of the EEPROM 21 in which the predetermined phase angle ranges TL, TM, TH, and the like are described. The target current is derived by calculation based on the approximate expression, and the phase angle range is directly input to the phase angle scanning means 10, whereby the constant control of the target input power is performed. At this time, since the phase angle vs. target current characteristic 8 is naturally different depending on the motor having the different maximum input power, it is described in the writable / erasable EEPROM 21 and only the arithmetic processing which is not affected by the motor performance is the mathematical operation means 22 in the microcomputer 6. Just do it.
[0075]
As described above, it is possible to obtain an input control device for a vacuum cleaner having a constant input in a short period of time even with motors having different capacities.
[0076]
Embodiment 6
Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings.
FIG. 16 is a functional block diagram of the input control device of the vacuum cleaner according to the sixth embodiment, and FIG. 17 is a characteristic diagram of the air flow versus the input power. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals. The description is omitted. In FIG. 16, reference numeral 23 denotes a current output inspection means for detecting a current output of the current detection means 4, and detects a voltage output by connecting a low current load device (not shown) which is replaced with the suction motor 2 at the time of shipment of the apparatus. I do. Reference numeral 24 denotes an EEPROM for storing the result of the output of the current output inspection means 23, and reference numeral 25 denotes a second mathematical expression correction means for correcting and changing the output of the characteristic calculation means 9 in response to the result of the EEPROM 24 during operation of the present apparatus. The output after the correction / change is input to the phase angle scanning means 10.
[0077]
Next, the operation will be described with reference to FIG. The operation is the same as that described in the third embodiment, and aims to obtain a stable input power by correcting the variation of the target input power due to the variation in the output of the current detection means 4. Here, the output variation of the current detecting means 4 is caused by the accuracy and variation of the current sensor 4a and the peripheral circuit portion. For example, the output amount-input power characteristic when the output Vk-α is slightly lower than the reference output Vk is output. As shown in FIG. As described in the third embodiment, even if the current output is low, the phase angle moves along the target input power characteristic. Therefore, in the example, the output is corrected, that is, the input is higher than the target input power. Will be driven.
[0078]
As described above, a stable target input power can be obtained by inspecting the variation width by the current output inspection means 23 and correcting the correction according to the variation width by the second mathematical expression changing means 25. This correction method can also be performed with a simple configuration that adjusts the b term of the above-described linear expression Ltw = ax + b. In addition, by writing the results of the inspection means in the EEPROM 24, correction at the time of shipment becomes possible, and it can be realized without affecting the contents of the program of the microcomputer 6, thereby improving development efficiency and reducing costs.
[0079]
In the configurations described in the first to sixth embodiments, three types of target input power are described. However, the present invention is not limited to this, and various types of target input power may be set. The switching may be based on input power information from a switch operation, a method of automatically allocating, or a combination of both.
[0080]
【The invention's effect】
As described above, according to the present invention, current detection means for detecting a current flowing through a motor,A target formed by connecting current values at which input power is constant for multiple airflow current characteristics corresponding to the phase angle with the airflow as a parameterBased on current characteristics, Corresponding to a predetermined phase angleCharacteristic calculating means for calculating a target current value;,When the detected current values detected by the current detecting means are not equal,the aboveDetection current valueEstimate the air flow current characteristics passing through, the intersection of the estimated air flow current characteristics and the target current characteristicsA phase angle scanning means for calculating a phase angle, and a phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means, so that constant control of the input power can be performed. In addition, the input power and the air flow can be efficiently controlled in accordance with the amount of dust and the state of the surface to be cleaned, so that durability and assembly workability can be improved.
[0081]
Further, according to the present invention, a current detecting means for detecting a current flowing through the motor,A target formed by connecting current values at which input power is constant for a plurality of airflow current characteristics corresponding to the phase angle with the airflow as a parameterBased on current characteristics, Corresponding to a predetermined phase angleA characteristic calculating means for calculating a target current value, and calculating a phase angle obtained by subtracting a phase angle of a predetermined width from the predetermined phase angle when the target current value is larger than the detected current value detected by the current detecting means. When the target current value is smaller than the detected current value, a phase angle scanning means for calculating a phase angle obtained by adding a phase angle of a predetermined width to the predetermined phase angle, and the phase calculated by the phase angle scanning means Phase control means for controlling the input power of the motor based on the angle,The phase angle scanning means and the phase angle control means repeat until the detected current value matches a current value on the target current characteristic.As a result, an inrush current due to a sudden change in the phase angle can be prevented, a device with smooth input power transition and excellent quietness can be obtained. Simplification can be achieved.
[0082]
Also, PrescribedEquation for approximating target current characteristics in the phase angle range ofRepresented byTherefore, when there are a plurality of target input power characteristics, the load of the microcomputer program capacity can be reduced with respect to the table mapping method. Further, even if the air volume characteristics deviate from the reference value due to the power supply voltage fluctuation, the motor characteristics fluctuation, and the current sensor accuracy fluctuation, the entire air volume characteristics region can be covered by the mathematical formula, so that stable and suitable input control can be achieved.
[0083]
A target current value corresponding to the phase angle calculated by the phase angle scanning means;And the air volumeThe air flow rate calculation means for deriving the air flow rate based on the current characteristics makes it possible to detect the state of the air flow rate without using a pressure sensor or the like, thereby reducing costs, improving durability, and improving assembly workability. Can be provided. Further, for example, at the time of abnormal use such as a closed operation, control for switching to motor stop information or weak operation can be performed, and durability can be improved.
[0084]
Further, a voltage detecting means for detecting the voltage of the power supply, and a first mathematical expression for correcting the output of the characteristic calculating means based on the voltage detected by the voltage detecting means, and inputting the corrected output to the phase angle scanning means Means, constant input power control can be performed irrespective of the power supply voltage, a suitable constant target input can be performed by a simple correction process, and correction of the phase angle setting is unnecessary, so that the correction means is simplified. be able to.
[0085]
Further, an EEPROM for detecting the current output of the current detection means by the current output inspection means and storing the detection result,,Since the output of the characteristic calculating means is corrected based on the detected current output and the second mathematical expression changing means for inputting the corrected output to the phase angle scanning means is provided, the relationship between the air volume and the target input power is kept constant. Since it is possible to obtain a suction force corresponding to the predetermined air volume, efficient and suitable operation can be achieved.
[0086]
Further, a motor characteristic detecting means for detecting a motor characteristic, and a predetermined phase angle range output from the characteristic calculating means based on the motor characteristic value detected by the motor characteristic detecting means are corrected and input to the phase angle scanning means. Since the phase angle range correcting means is provided, the target input power constant control is realized. At this time, since the phase angle versus the target current characteristic is naturally different depending on the motor having the different maximum input power, it is described in a writable / erasable EEPROM, and only the arithmetic processing which is not affected by the motor performance is performed by a mathematical operation means in the microcomputer. However, it is possible to construct a control device having a constant input power in a short period of time even in a motor having a different power.
[0087]
Also,According to the inventionCurrent detection means for detecting a current flowing through the motor,For a plurality of airflow current characteristics corresponding to the phase angle with the airflow as a parameter, the target current characteristics formed by connecting the current values at which the input power is constantPredeterminedPhase angle rangeAn EEPROM storing an approximate expression of a target current characteristic and the predetermined phase angle range; an arithmetic operation means for calculating a target current value based on the approximate expression and the predetermined phase angle range stored in the EEPROM; Target current value and,When the detected current values detected by the current detecting means are not equal,the aboveDetection current valueIs estimated, and becomes an intersection of the estimated airflow current characteristic and the approximate expression of the target current characteristic.A phase angle scanning unit that calculates a phase angle; and a phase control unit that controls the input power of the motor based on the phase angle calculated by the phase angle scanning unit. Input power can be obtained. Further, by writing the result of the inspection means in the EEPROM, correction at the time of shipment can be performed, and it is not necessary to change the program content of the microcomputer, and the development efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 2 is a characteristic diagram showing air volume-input power and current characteristics according to the first embodiment of the present invention.
FIG. 3 is a basic characteristic diagram showing a phase angle-input power characteristic in the first embodiment of the present invention.
FIG. 4 is a basic characteristic diagram showing a phase angle-current characteristic according to the first embodiment of the present invention.
FIG. 5 is a characteristic explanatory diagram showing a partial enlargement of a phase angle versus a target current characteristic according to the first embodiment of the present invention.
FIG. 6 is an operation flowchart showing a part of the input control device of the electric vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 7 is an input power characteristic diagram obtained by the input control device for the vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 8 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 2 of the present invention.
FIG. 9 is a characteristic explanatory diagram showing a partial enlargement of a phase angle versus a target current characteristic according to the second embodiment of the present invention.
FIG. 10 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 3 of the present invention.
FIG. 11 is a characteristic explanatory diagram showing a partial enlargement of a phase angle versus a target current characteristic in Embodiment 3 of the present invention.
FIG. 12 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 4 of the present invention.
FIG. 13 is a characteristic explanatory diagram showing a partial enlargement of a phase angle versus a target current characteristic in Embodiment 4 of the present invention.
FIG. 14 is an input characteristic diagram illustrating airflow versus input characteristics according to Embodiment 4 of the present invention.
FIG. 15 is a functional block diagram showing an input control device for a vacuum cleaner according to Embodiment 5 of the present invention.
FIG. 16 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 6 of the present invention.
FIG. 17 is an input power characteristic diagram illustrating an air flow versus input characteristic according to Embodiment 6 of the present invention.
FIG. 18 is an input characteristic diagram of a conventional general vacuum cleaner input control device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 commercial AC power supply, 2 suction motor, 3 bidirectional thyristor, 4 current detection sensor, 4a current sensor, 6 microcomputer, 7 basic characteristics, 8 phase angle versus target current characteristics, 9 characteristic calculation means, 10 phase angle scanning Means, 12 phase control means, 16 air volume calculation means, 17 power supply voltage detection means, 18 first formula change means, 19 motor characteristic detection means, 20 phase angle range correction means, 21 EEPROM (formula / phase angle range), 22 formula Calculation means, 23 current output inspection means, 24 EEPROM (current output inspection), 25 second mathematical expression correction means.

Claims (8)

Current detection means for detecting a current flowing through the motor,
A target current value corresponding to a predetermined phase angle is determined based on a target current characteristic formed by connecting current values at which input power is constant with respect to a plurality of air flow current characteristics corresponding to a phase angle using the air flow as a parameter. Characteristic calculating means for calculating;
And the target current value, when not equal to the detected current value detected by the current detecting means, and estimate the airflow current characteristics through the detected current value, the phase angle of intersection of the inferred air volume current characteristic and the target current characteristics Phase angle scanning means for calculating
Phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means ,
An input control device for a vacuum cleaner, comprising: Current detection means for detecting a current flowing through the motor,
A target current value corresponding to a predetermined phase angle based on a target current characteristic formed by connecting a current value at which input power is constant with respect to a plurality of air flow current characteristics corresponding to a phase angle using the air flow as a parameter. Characteristic calculating means for calculating
When the target current value is larger than the detected current value detected by the current detecting means, a phase angle obtained by subtracting a phase angle of a predetermined width from the predetermined phase angle is calculated, and the target current value is calculated from the detected current value. When smaller, a phase angle scanning means for calculating a phase angle obtained by adding a phase angle of a predetermined width to the predetermined phase angle,
Phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means ,
With
The input control device for a vacuum cleaner, wherein the phase angle scanning means and the phase angle control means repeat until the detected current value matches a current value on the target current characteristic . 3. The input control device for a vacuum cleaner according to claim 1, wherein a target current characteristic in a predetermined phase angle range is represented by an approximate expression. 3. An air volume calculation unit for deriving an air volume based on a target current value corresponding to the phase angle calculated by the phase angle scanning unit and the air volume current characteristic, according to claim 1, further comprising: Vacuum cleaner input control device. Voltage detection means for detecting the voltage of the power supply,
A first equation changing means for correcting the output of the characteristic calculating means based on the voltage detected by the voltage detecting means, and inputting the corrected output to the phase angle scanning means ;
The input control device for a vacuum cleaner according to claim 3, further comprising: An EEPROM for detecting the current output of the current detection means by the current output inspection means and storing the detection result;
A second mathematical expression changing means for correcting the output of the characteristic calculating means by the EEPROM based on the detected current output, and inputting the corrected output to the phase angle scanning means ;
The input control device for a vacuum cleaner according to claim 3, further comprising: Motor characteristic detecting means for detecting motor characteristics;
And phase angle range correcting means for inputting the corrected phase angle scanning means a predetermined phase angle range outputted from the characteristic calculating means based on the detected motor characteristic value by the motor characteristic detection means,
The input control device for a vacuum cleaner according to any one of claims 1 to 3, further comprising: Current detection means for detecting a current flowing through the motor,
For a plurality of airflow current characteristics corresponding to a phase angle with the airflow as a parameter, an approximate expression of a target current characteristic in a predetermined phase angle range in a target current characteristic formed by connecting current values at which input power is constant. An EEPROM storing the predetermined phase angle range,
A formula calculating means for calculating a target current value based on the approximation formula stored in the EEPROM and the predetermined phase angle range;
And the target current value, when not equal to the detected current value detected by the current detecting means, and estimates the air volume current characteristics through the detected current value, the approximate expression of the inferred air volume current characteristic and the target current characteristics Phase angle scanning means for calculating a phase angle serving as an intersection ,
Phase control means for controlling the input power of the motor based on the phase angle calculated by the phase angle scanning means ,
An input control device for a vacuum cleaner, comprising:

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