JPH0255074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an agitating washing machine in which a washing drive motor is operated in forward and reverse directions to perform stirring washing.

[Conventional technology]

Conventionally, this type of washing machine uses a timer to operate the motor in forward and reverse directions to generate reciprocating motion of the stirring blades, and when switching between forward and reverse operation, a large inertial force is applied to rotating parts such as the drive device and stirring blades. Therefore, it is necessary to provide the rotating parts with sufficient strength to withstand this, which has the disadvantage of increasing costs.

[Problem to be solved by the invention]

Therefore, in order to eliminate this drawback, a method is adopted in which a time period is provided to stop energization when switching between forward and reverse operation of the motor, and the forward and reverse operation is performed after the motor has stopped (for example,
-44674) has been adopted. However, this method is a timed control method using a timer, so
During no-load operation with no items to be washed or when there are only a few items to be washed, it takes a long time to stop after the motor is de-energized.On the other hand, when there are many items to be washed, the items to be washed act as a brake, and it takes time to stop. became shorter. Therefore, it is necessary to determine the time to stop during no-load operation, which takes the longest time to stop, and if there is a large amount of washing to be done, it is necessary to set the time to stop during no-load operation. This resulted in wasted time and inefficient washing. In addition, since the energization time of the motor is constant, the rotation angle of the stirring blade is large when there are few items to be washed, and the rotation angle is small when there are many items to be washed, which is a drawback of having operating characteristics that are opposite to those required for a washing machine. It was hot.

Therefore, a method has been considered in which a large number of control time periods are provided depending on the amount of items to be washed, and the washing is performed by switching between them, but this method has the drawback of complicating the control system.

The present invention has been made to eliminate these drawbacks, and it suppresses the variation in the rotation angle when the stirring blade motor is energized depending on the amount of washing, and also reduces the time required for inertial rotation to stop and allows for a large amount of washing. To provide an agitating type washer that can eliminate loss due to waiting time when switching between forward and reverse operation.

[Means to solve the problem]

In order to achieve the above object, an agitating type washer according to the present invention is an agitating type washer that performs washing by alternately forward and reverse rotation of stirring blades in a washing tank by forward and reverse rotation of a washing drive motor. Rotation detection consists of a permanent magnet fixed to the shaft and a detection body fixed to the stator of the motor via a mounting member in opposition to the permanent magnet, and detects the number of rotations of the motor when the motor is energized and the stoppage of inertial rotation. and a control section operated by the detection pulse of the rotation detection section, and the control section includes a rotation number setting section that sets a pulse corresponding to the number of rotations of the motor when the motor is energized, and a rotation number setting section that sets a pulse corresponding to the number of rotations of the motor when the motor is energized; A energization cutoff section that cuts off power to the motor when the motor reaches the set number of rotations based on a signal from a comparison section that compares the number of rotations of the motor when the motor is energized by this counter and the number of rotations set by the setting section. , a stop determination section that determines whether the pulses have stopped, a forward/reverse operation setting section that sets the rotation direction of the motor to the opposite direction, and a forward/reverse operation switch that switches the rotation direction of the motor based on the settings of the forward/reverse operation setting section. Department.

[Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings.
In Fig. 1 A, B, and C, 1 is an outer box of the washing machine, 2 is a washing tank fixed inside the outer box 1 and performs washing, and 3 is inserted into the center of the bottom of the washing tank 2 in a watertight manner, and the main bearing. 4 is a rotatably supported main shaft; 5 is a stirring blade attached to the main shaft 3 in the washing tank 2; 6 is a pulley attached to the lower end of the main shaft 3; 7 is attached to the bottom of the outer box 1; 8 is a motor pulley attached to the rotor shaft 9 of the motor 7; 10 is a belt connecting the pulley 6 and the motor pulley 8;
When rotated, the stirring blade 5 rotates via the motor pulley 8, belt 10, and pulley 6.

The reduction ratio determined by the pulley 6 and the motor pulley 8 is approximately 10:1, and when the motor rotates once, the stirring blade 5 rotates through an angle of approximately 36 degrees.

A motor bracket 7'' fixed to the stator 7' of the highly rigid motor 7 is provided with a rotation detecting section 11 for detecting the number of rotations of the motor and the stoppage of rotation when the motor is energized. A cylindrical permanent magnet 12 fixed to the lower end 9' of the rotor shaft 9 of the motor 7, and a cylindrical wound power generator facing the outer periphery of the permanent magnet 12 with a predetermined gap therebetween. It consists of a coil 13 and a detection body having a magnetic shield 13' fixed to the inner peripheral surface of the coil 13 to partially block the magnetic force of the permanent magnet 12, and this detection body is connected to the bracket 7'.
is fixed to via a mounting member. When the motor shaft 9 rotates, the rotation detection section 11 detects that the motor shaft 9 is rotated.
Since the permanent magnet 12 fixed to the magnet 12 also rotates, a sinusoidal current is induced in the generator coil 13 periodically with the rotation of the permanent magnet 12, and this is electrically processed and synchronized with this when the motor 7 rotates. A pulsed electrical signal is output. A rotation detecting section 11 is disposed on a bracket 7'' fixed to a stator 7' of a motor 7, which is mostly made of metal, to directly detect the rotational state of the motor's rotor shaft, and the assembly accuracy is high. It is easy to work with and has a structure that allows accurate and stable detection of the rotational state of the motor.

FIG. 2 shows the control system of the above-mentioned device, and 14 is a control circuit as a control unit, which is composed of a memory 15, an arithmetic processing unit 16, an input control 17, and an output control 18. The control unit 14 includes a power switch. A power supply is connected via 19. The rotation detection unit 11 detects the number of rotations and the stoppage of rotation when the motor 7 is energized, and this detection signal is input to the control unit 14 via the input control 17, and is processed and calculated by the memory 15 and the arithmetic processing unit 16. is applied as a control signal to the motor 7 via the output control 18, and the motor 7 is rotated clockwise and counterclockwise by this output.

FIG. 3 is a flowchart illustrating the operation of the control system when using the above device. Step 100 is the forward/reverse operation flag for the motor 7, and step 101 is the motor 7 forward/reverse operation flag.
In the rotation number setting section for setting the number of rotations of the motor 7 when energized, the number of pulses N corresponding to the number of rotations is set, and this value is entered into the register X in the memory 15 in step 102. Steps 103, 10
4,105 is a forward/reverse operation switching section of the motor 7;
Step 106 is a counter that counts the number of rotations of the motor 7 (the number of pulses from the rotation detection section 11) when the motor 7 is energized, and the value is input to the register T in the memory 15. Step 107 is a comparison section that compares whether the number of rotations of the motor 7 when the motor 7 is energized has reached the set value N. Step 108 is an energization cutoff section that cuts off the energization of the motor 7. Step 109 is a comparison section that compares whether the number of rotations of the motor 7 when the motor 7 is energized has reached the set value N. A stop determination unit, steps 110, 111, and 112, which determines that the motor 7 has stopped when the pulse signal disappears, is a forward/reverse operation setting unit for the motor.

[Effect]

Next, the operation of the above device will be explained. First, the items to be washed, water and detergent are placed in the washing tank 2, and the power switch 19 is turned on. In step 100, a flag F for executing clockwise rotation of the motor 7 is set to 1, in step 101 the number of rotation pulses N of the motor 7 is set, and in step 102, the value is entered in register X. Since F=1 in the forward/reverse operation switching section of step 103, the process proceeds to step 104, where the motor 7 rotates clockwise, the stirring blade 5 also rotates clockwise via the pulley 6, and washing is started. At the same time, a pulse signal is generated from the rotation detection section 11.
This pulse signal is counted by the counter in step 106 and placed in the T register, and in step 107, the contents of register X are compared as register T.
If T<X, return to step 103 and motor 7
Continue driving to the right. Then, if T≧X, the power to the motor 7 is cut off in step 108, and in step 109, it is confirmed that the motor 7, which was rotating due to inertial force, has stopped since the pulse signal from the rotation detection section 11 has disappeared. However, since F=1 in step 110, the process advances to step 111 and F=1.
0 to set left direction driving, and in step 113 the T register is set to 0, and the process returns to step 103. This time, since F=0, the process advances to step 105, and the motor 7 starts driving in the left direction. Thereafter, the program proceeds in the same manner as the rightward operation, and the stirring blades 5 repeat reciprocating motions and continue washing until the power switch 19 is shut off.

For example, the output of the rotation detection section 11 is such that one pulse is generated per one rotation of the motor, and step 1
In 01, the number of pulses N for setting the number of rotations of the motor 7 when the motor 7 is energized is set to 5, and the motor 7 rotates with inertia of 2 rotations after the energization of the motor 7 is cut off and before the motor 7 stops. Then, the stirring blade 5 has a rotation angle of 180 degrees due to energization and a rotation angle of 72 degrees due to inertial rotation, totaling about 250 degrees (of course, the rotation angle is slightly larger due to the influence of the resolution of the rotation detection section 11). It repeats reciprocating motion alternately, rotating clockwise and counterclockwise, to shake and agitate the items to be washed to remove dirt from the items to be washed. When there is a large amount of items to be washed, there is a lot of resistance, and the rotation angle of the stirring blade due to inertial rotation is small.Conversely, when there is a small amount of items to be washed, there is little resistance, so the rotation angle due to inertial rotation becomes large, which increases the rotation angle due to inertial rotation. The reciprocating rotation angle changes automatically, and the reciprocating period also changes. In addition, after cutting off the power to the motor, it is determined that the inertial rotation of the motor has stopped and the machine is immediately reversed, so washing can be carried out efficiently without putting stress on the mechanical parts or wasting waiting time.

In the above embodiment, the rotation detection section is composed of what is generally called a pilot generator, which has a permanent magnet on the rotor shaft of the motor and a power generation coil arranged around the permanent magnet. However, the permanent magnet of the rotor shaft is not limited to, and a magnetoresistive element or a Hall element is provided in a member fixed to the stator with a predetermined space corresponding to the permanent magnet of the rotor shaft. A pulse output may be generated in response to the rotation of the rotor, and with such a structure, the number of rotations of the rotor can be reliably detected without being affected by the rotation speed of the rotor shaft. There are advantages. Furthermore, the determination of whether the motor has stopped does not only mean that it has completely stopped, but also when the pulse interval from the rotation detection section is more than how many milliseconds, or within how many milliseconds after the pulse signal is generated. A possible case is that the next pulse signal is not generated.

〔Effect of the invention〕

As described above, the present invention does not control the energization time and energization time to the motor at a constant level like the conventional timer type, but instead uses a permanent magnet fixed to the rotor shaft of the motor and a permanent magnet facing the permanent magnet. The rotation detecting unit, which is composed of a detection body fixed to the stator of the motor via a mounting member, directly detects the number of rotations of the motor when the motor is energized, and based on this detection pulse, the control unit determines the number of times the motor is energized. When the set value is reached, the energization is cut off, and when it is detected that the motor has stopped, the motor can immediately start operating in the reverse direction.In this way, the energization rotation angle of the stirring blade can be adjusted with precision. The washing machine is oscillated to the left and right at a constant rate, and the items to be washed are agitated.
Washability can be stabilized. In addition, in the present invention, after the power supply to the motor is cut off, the stoppage of the motor is detected and the motor is immediately operated in the reverse direction, so there is no stress on the mechanism, there is no wasted waiting time, and the washing can be done efficiently. The present invention has the effect of providing a high-quality, simple-structured, and inexpensive agitation-type washer that can perform the following tasks.

[Brief explanation of the drawing]

1A, B, and C are respectively a longitudinal sectional front view, a cross-sectional bottom view taken along the line A-A, and a partially enlarged view of the device of the present invention;
FIG. 2 is a block diagram of the control system of the apparatus of the present invention, and FIG. 3 is a flowchart for explaining the operation of the apparatus of the present invention. 2... Washing tank, 5... Stirring blade, 6... Pulley, 7...
Washing drive motor, 11... Rotation detection unit, 12...
Permanent magnet, 14...control unit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In an agitating washing machine that performs washing by alternately forwarding and reversing the stirring blades in the washing tank by forward and reverse operation of the washing drive motor, a permanent magnet fixed to the rotor shaft of the motor, and a permanent magnet facing this permanent magnet are used. It consists of a detection body fixed to the stator of the above motor via a mounting member, and is operated by a rotation detection unit that detects the number of rotations of the motor and the stoppage of inertial rotation when the motor is energized, and a detection pulse of this rotation detection unit. The control section includes a rotation number setting section that sets a pulse corresponding to the number of rotations of the motor when the motor is energized, a counter for the detection pulse,
an energization cutoff section that cuts off the energization to the motor when the motor reaches the set number of rotations based on a signal from a comparison section that compares the number of rotations of the motor when the motor is energized by the counter and the number of rotations set by the setting section;
a stop determination unit that determines whether the pulse has stopped; a forward/reverse operation setting unit that sets the rotation direction of the motor in the opposite direction;
and an agitation type washing machine characterized by having a forward/reverse operation switching section that switches the rotational direction of the motor based on the settings of the forward/reverse operation setting section.