JPH08224394A - Spin control device of washing machine - Google Patents

Abstract

PURPOSE: To provide a full automatic washing machine which shortens the time until a spin basket serving both for washing and drying, stops rotating after the basket finishes drying. CONSTITUTION: When a triode AC switch 2 is turned on, the same phase current flows in the M-coil 5a of a motor 5 while advanced phase current flows in the S-coil 5b, and the motor 5, accordingly a spin dryer chamber 7, begins rotating. When the frequency (f) of the impressed voltage on the motor 5 is divided into f/N immediately after the end of spinning, regeneration of motor current to the commercial AC 1 occurs, and an electric brake force is applied to the motor 5 to cause deceleration. When the spin dryer chamber 7 comes to standstill substantially, current feed to the motor 5 is shut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device at the end of spin-drying for a washing machine having a spin-drying tank for washing and spin-drying.

[0002]

2. Description of the Related Art Conventionally, in a fully automatic washing machine in which washing and spin-drying are integrated, a mechanical brake is applied when the spin-drying is completed and the spin-down is almost stopped. The dehydration tank is stopped. Immediately after completion of the dehydration work, the dehydration tub is rotating at a high speed due to the inertia of the dehydration tub, laundry, etc. If a brake is applied at this point, large noise and vibration are generated, and the brake shoe The purpose of this is to expedite consumption, and the brake is applied when the dehydration tank rotates at a low speed as described above.

Therefore, for example, Japanese Unexamined Patent Publication No. 4-189396
As shown in the publication, the brake is applied when the rotation speed of the dehydration tank is detected and the rotation speed of the dehydration tank is reduced to a value at which the mechanical brake can be applied. Therefore, it is not necessary to set the time for applying the brake to the longest time in consideration of the amount of cloth and the variation of products, and the washing time can be shortened. However, the time can be shortened only when the amount of cloth is small or when the axial loss of the dehydration tank is large due to product variations.

[0004]

In the conventional dehydration control device for a washing machine as described above, the mechanical brake is applied after the rotation speed of the dehydration tub is sufficiently low. The brake control avoids wear of the brake shoes, so that rapid braking cannot be applied except in an emergency. As a result, in the washing process of the fully automatic washing machine, there is a problem that it takes time to shift from the completion of dehydration to the next process, and the washing time cannot be shortened.

The present invention has been made in order to solve the above problems, and provides a dehydration control device for a washing machine in which the dehydration tub is stopped in a short time immediately after the completion of the dehydration so that the washing time can be shortened. With the goal.

[0006]

A dewatering controller for a washing machine according to a first aspect of the present invention controls a dewatering operation end control element to generate an electric braking force on a motor of a dewatering tank. It is equipped with.

The washing machine dehydration control device according to a second aspect of the present invention is the washing machine dehydration control device according to the first aspect, wherein the braking force control means reduces the frequency applied to the motor to a frequency division frequency of the power source frequency immediately after the completion of the dehydration operation. After that, the power supply to the motor is stopped.

The washing machine dehydration control device according to a third aspect of the present invention is the washing machine dehydration control device according to the first aspect, wherein a rotation speed detection circuit for detecting the rotation speed of the motor is provided and the braking force control means is provided immediately after the completion of the dehydration operation. The frequency applied to the motor is reduced to the frequency divided by the power supply frequency in a stepwise manner corresponding to the detected rotation speed, and when the detected rotation speed reaches a predetermined value, the power supply to the motor is stopped. It is a thing.

The washing machine dehydration control device according to a fourth aspect of the present invention is the washing machine dehydration control device according to the first aspect, wherein a rotation speed detection circuit for detecting the rotation speed of the motor is provided and the braking force control means is provided immediately after the completion of the dehydration operation. The motor is energized so as to drive it in the reverse direction, and the energization of the motor is stopped when the detected rotation speed reaches a predetermined value.

A washing machine dehydration control device according to a fifth aspect of the present invention is the same as that of the first aspect, wherein a rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means is provided as one of the control elements. At the end of dehydration operation by control, the motor is driven in the reverse direction by the other control of the control element,
The energization angle is gradually increased by phase control, and energization to the motor is stopped when the detected rotation speed reaches a predetermined value.

Further, a washing machine dehydration control device according to a sixth aspect of the present invention is the same as that of the first aspect, wherein a rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means is provided as one of the control elements. Immediately after the completion of the dehydration operation by control, the frequency applied to the motor is reduced to the frequency division frequency of the power supply frequency, and when the detected rotation speed reaches the first predetermined value, the other control element is controlled to drive the motor in the reverse direction. To energize,
When the second predetermined value is reached, the power supply to the motor is stopped.

Further, a dehydrator control device for a washing machine according to a seventh aspect of the present invention is the same as that of the sixth aspect, wherein the frequency division frequency is reduced stepwise in accordance with the detected rotation speed.

The washing machine dehydration control device according to the eighth aspect of the invention is provided with a control element for short-circuiting the main winding or the auxiliary winding of the motor, and the short-circuit control element is operated after the completion of the dehydration operation.
It is provided with a braking force control means for stopping energization of the motor when the rotation speed of the motor decreases.

The washing machine dehydration control device according to a ninth aspect of the present invention is the washing machine dehydration control device according to the eighth aspect, wherein a rotation speed detection circuit for detecting the rotation speed of the motor is provided and the braking force control means is short-circuited after the completion of the dehydration operation. The control element is operated to energize the motor so as to drive it in the reverse rotation direction when the rotation speed of the motor decreases, and to stop energization to the motor when the detected rotation speed reaches a predetermined value.

A washing machine dehydration control device according to a tenth aspect of the present invention is the washing machine dehydration control device according to any one of the second, third, sixth and seventh aspects, further comprising: a phase control element inserted between the commercial power source and the motor. , Having a reverse phase control element respectively connected between one power supply side of this phase control element and the other motor side of the phase control element, and operating the phase control element or the reverse phase control element. The voltage applied to the motor in the order phase or the opposite phase is applied to the motor to change the frequency applied to the motor to the frequency dividing frequency.

[0016]

In the first aspect of the present invention, since the electric braking force is generated by the motor of the dehydration tank for both washing and dehydration at the end of the dehydration operation, the rotation speed of the dehydration tank at the end of the dehydration operation is fast. Fall to.

Further, in the second aspect of the invention, since the frequency applied to the motor is reduced to the frequency dividing frequency of the power source frequency immediately after the completion of the dehydration operation, the energization of the motor is stopped, so that the rotation speed of the dehydration tank is reduced. The electric brake operates until the frequency reaches the synchronous rotation speed of the divided frequency.

Further, in the third aspect of the invention, immediately after the completion of the dehydration operation, the frequency applied to the motor is gradually reduced to the frequency dividing frequency of the power supply frequency in accordance with the rotation speed of the motor, and the rotation speed becomes a predetermined value. In that case, since the power supply to the motor is stopped, the dehydration tank is decelerated by the electric brake corresponding to the rotation speed.

Further, in the fourth aspect of the invention, the motor is energized so as to drive the motor in the reverse direction immediately after the dehydration operation is completed, and the energization of the motor is stopped when the rotation speed of the motor reaches a predetermined value. Is decelerated by the reverse torque of the motor.

Further, in the fifth aspect of the invention, the motor is driven in the reverse direction immediately after the dehydration operation is completed, and the energization angle is gradually increased by the phase control so that the energization of the motor is stopped when the rotation speed of the motor reaches a predetermined value. Since this is done, a large current due to energization in the reverse direction is suppressed.

Further, in the sixth invention, the frequency applied to the motor immediately after the completion of the dehydration operation is reduced to the frequency dividing frequency of the power supply frequency, and in the seventh invention, the frequency is gradually reduced corresponding to the rotation speed of the motor. When the rotation speed of the motor reaches the first predetermined value, the motor is energized so as to drive the motor in the reverse direction, and when it reaches the second predetermined value, the power supply to the motor is stopped. Even when the frequency becomes lower than the frequency division frequency of the commercial power supply frequency, it becomes possible to stop the dehydration tank quickly by applying the electric brake.

Further, in the eighth aspect of the invention, the main winding or the auxiliary winding of the motor is short-circuited immediately after the dehydration operation is finished, and when the rotation speed of the motor decreases, the power supply to the motor is stopped. Sufficient braking force can be obtained without detection.

Further, in the ninth invention, the main winding or the auxiliary winding of the motor is short-circuited immediately after the completion of the dehydration operation, and when the rotation speed of the motor decreases, the motor is energized so as to drive it in the reverse rotation direction. When the rotation speed reaches a predetermined value, the energization of the motor is stopped, so the braking force is strengthened.

Further, in the tenth aspect of the invention, since the voltage of the order phase or the opposite phase is applied to the motor to change the frequency applied to the motor to the frequency dividing frequency, the commercial power source frequency is sufficiently frequency divided. It

[0025]

【Example】

Example 1. 1 to 5 are views showing an embodiment of the first and second inventions of the present invention, FIG. 1 is a drive circuit diagram, FIG. 2 is a waveform diagram for explaining an operation principle, FIG. 3 is an electric brake operation characteristic diagram, Figure 4
5 is a waveform diagram for explaining the frequency dividing operation, and FIG. 5 is a measured diagram of deceleration time. In the figure, the same reference numerals indicate the same or corresponding portions (the same applies to the following embodiments).

In FIG. 1, (1) is a commercial power supply, (2) is a triac for forward rotation whose terminal T1 is connected to the commercial power supply (1), (3) is a triac for reverse rotation, and (4) is a triac. (2) Phase advancing capacitor connected between terminals T2 of (3),
(5) is a single-phase induction motor, which has a main winding (hereinafter referred to as M coil) (5a) and an auxiliary winding (hereinafter referred to as S coil) (5b), and one end of the M coil (5a) and the S coil ( One end of 5b) is connected to both ends of the phase advancing capacitor (4), and the other ends are connected to each other. (6) is the output shaft of the motor (5), which is the dehydration tank to be shown later.
The drive shaft of (7) is shared.

(7) is a dehydration tub which is driven by the drive shaft (6) and also serves as a washing tub of a washing machine, and (8) detects the rotation speed of the output shaft (6) and outputs a speed detection signal (8a). Rotation speed detection circuit,
(9) is a zero-cross detection circuit that is connected to the commercial power supply (1) and detects the zero-cross point of the AC voltage and outputs a zero-cross detection signal (9a). (10) is the rotation speed detection circuit (8) and zero-cross detection circuit ( The triac control circuit is connected to 9) and outputs the gate control signal (10a) to the gate terminal G of the triac (2) and outputs the gate control signal (10b) to the gate terminal G of the triac (3).

In the washing machine dehydration controller having the above structure, the triac (2) is turned on by the gate control signal (10a).
When turned on, commercial power (1) is applied to the motor (5),
A current of the same phase flows through the M coil (5a), and a phase-advancing current having a phase advance of 90 ° flows through the S-coil (5b) through the phase-advancing capacitor (4). As a result, a positive rotating magnetic field (frequency of commercial power supply (1)) is generated from the stator (not shown), and the rotor (not shown)
Is driven in the positive direction. As a result, the output shaft (6) also rotates in the forward direction to drive the dehydration tank (7).

On the other hand, the triac (3) is connected to the gate control signal.
When it is turned on at (10b), the commercial power supply (1) is applied to the motor (5), but the current in phase with the S coil (5b) and the M coil (5a)
A phase-advancing current flows through the phase-advancing capacitor (4), a reverse rotating magnetic field is generated in the stator, and the rotor is driven in the reverse direction. The rotation speed of the output shaft (6), that is, the dehydration tank (7), is detected by the rotation speed detection circuit (8), the rotation speed detection signal (8a) is input to the triac control circuit (10), and the electric power after the dehydration is completed. It is used as rotation speed information during brake control.

The zero cross detection circuit (9) detects the zero voltage point of the commercial power supply voltage, the zero cross detection signal (9a) is input to the triac control circuit (10), and the zero voltage point of the commercial power supply (1) is used as a reference. Control the triacs (2) and (3). That is, the triac control circuit (10) is a control unit that rotates the motor (5) forward or backward, or applies an electric brake to the motor (5).

Next, the commercial power source (1) is connected to the triacs (2) (3).
FIG. 2 shows an example of controlling by. 2 (a) shows the voltage of the commercial power supply (1), (1a) shows its zero-cross point, and FIG. 2 (b) shows the zero-cross detection signal (9a). In this case, the rising edge of the pulse shows the zero-cross point. 2 (c) shows the gate control signals (10a) (10b), and FIG. 2 (d) shows the gate control signals (10a) (10b) based on the zero-cross detection signal (9a). ) Is the voltage applied to. That is, when the gate control signals (10a) and (10b) are output with respect to the zero-cross detection signal (9a), the half wave of the commercial power source (1) is applied to the motor (5).
Gate control signal for each pulse of zero-cross detection signal (9a)
When (10a) and (10b) are output, the commercial power supply (1) continuously
It will be applied to the motor (5).

Further, as shown in FIG. 2 (e), when the gate control signals (10a) (10b) are output with a certain phase delay with respect to the zero-cross detection signal (9a), FIG. 2 (f) is displayed. As shown, when the gate control signals (10a) (10b) are output, the triacs (2) (3) are turned on, the commercial power supply (1) is applied to the motor (5), and the next zero-cross point ( Triac (2) (3) in 1a)
Turns off and no voltage is applied to the motor (5). Such control is generally called phase control.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 3 (a) shows the frequency of the voltage applied to the motor (5), and FIG. 3 (b) shows the rotation speed of the dehydration tank (7). f is the basic frequency of the commercial power supply (1), 50 Hz in Japan
Or 60 Hz. f / N is a frequency obtained by dividing the fundamental frequency f by 1 / N, and the triac (2) is used as a gate control signal.
By the (10a), on / off control is performed in half-wave units between the zero-cross points (1a) and (1a) of the commercial power source (1) to apply a voltage of f / N frequency to the motor (7). For example, by controlling according to FIG. 3 and turning on the shaded portions of FIG. 4 with the triacs (2) and (3), as shown in FIGS. 4 (a) to 4 (e), the fundamental frequency f,
f / 2, f / 3, f / 4 and f / 5 can be made.

Now, as shown in FIG. 3, the motor is operated during dehydration.
In (5), the basic frequency f of the commercial power source (1) is constantly applied, and the high-speed dehydration operation period A starts. Since the motor (5) has slip, the rotation speed becomes smaller than the synchronous rotation speed, and the high-speed dehydration rotation speed n is 0.9 × f × when the motor (5) is operated with a slip of about 0.1. It is 2 / P (P is the number of poles). Immediately after the end of the high-speed dehydration operation period A, the motor (5)
When the frequency of the applied voltage to f / N is f / N, the motor current is regenerated to the commercial power source (1) because the rotor rotation frequency (speed) is higher than the frequency of the rotating magnetic field generated by the stator. As a result, the electric brake is applied, the motor (5) is decelerated, and the brake section B is reached.

In the brake section B, the frequency of f / N is applied to the motor (5), but when the rotational speed becomes equal to or lower than the synchronous rotational speed of f / N, the commercial power source (1) for the motor current is supplied. No longer regenerates, and the electric brake also stops working. If the energization of f / N frequency is continued for a longer time, the driving torque that tries to rotate at the f / N frequency will not be generated and the rotation speed will not decrease. Therefore, turn off the triacs (2) (3) and turn on the motor. Cut off the voltage to (5). This is the period C in which the motor (5) waits for the rotation speed to naturally decrease due to the shaft load such as shaft loss and frictional resistance.

Then, when the rotation speed detection circuit (8) detects that the rotation has almost stopped, or when the rotation speed is such that the mechanical parts are less worn even if the mechanical brake is applied, the mechanical brake escapes. When the tank (7) is stopped,
Move to the next step (finishing of rinsing or washing). By detecting the rotation speed, it is possible to minimize the transition time to the next step due to changes in the amount of cloth and product variations. However, even if the rotation speed is not detected, it is possible to shorten the time to some extent by estimating the deceleration effect of the electric brake.

As described above, the rotation speed of the dehydration tank (7) is f
The motor current is commercial power until the synchronous rotation speed of / N is reached.
By regenerating to (1), the electric brake acts on the motor (5), and the rotation speed of the dehydration tank (7) can be reduced.
It is possible to shorten the time required to stop (7). FIG. 5 shows the experimental results of this example.

In FIG. 5, (11) shows the brake timing. As shown in FIG. 5 (A), the dehydration tank (7) takes about 9 seconds from the high-speed dehydration rotation speed n ₁ to the synchronous rotation speed n ₂ of f / N (60/3). In contrast, the motor
In the free run in which (5) was turned off from the high-speed dewatering rotation speed n _{1 of the} dewatering tank (7), it was about 18 seconds as shown in Fig. 5 (B), and the time was shortened to about 9 seconds. I understand. In the case of a fully automatic washing machine, the standard dehydration is 3 times, 2 times at the end of washing and 2 times at the end of rinsing, so 9 × 3 = 27
It will reduce the time by seconds.

Embodiment 2 FIG. FIG. 6 shows the first and third aspects of the present invention.
It is an electric-brake operation | movement characteristic view which shows one Example of invention.
Note that FIGS. 1, 2, and 4 are also used in the second embodiment. As shown in FIG. 6 (a), the triac control circuit (10) controls the triac (2) immediately after the dehydration to apply the frequency f / N ₁ (for example, f / 2) to the motor (5). Apply the electric brake. When the rotation speed detection circuit (8) detects that the rotation speed of the dehydration tank (7) is close to the synchronous rotation speed of f / N ₁ , the frequency of f / N ₂ (for example, f / 3) is set to the motor. Apply to (5).

Similarly, hereafter, f / N ₃ , f / N ₄ and f / N n
The triac control circuit (10) turns off the triac (2) and stops energization of the motor (5) until the speed is reduced to a rotation speed at which the electric brake does not function. FIG. 6 (b) shows a change in rotation speed when an electric brake is applied to the dehydration tank (7) by the above control. f
The smaller the frequency of / Nn, the shorter the time until the motor (5) stops in free run, and the dehydration tank (7) can be stopped in a short time.

Example 3. FIG. 7 shows the first and fourth aspects of the present invention.
It is an electric brake operation | movement dynamic diagram which shows one Example of invention.
Note that FIG. 1 is also used in the third embodiment. Figure 7 (a) shows the dehydration tank
7 (b) shows the rotation speed change, and FIG. 7 (b) shows the on / off control timing of the triacs (2) and (3) by the triac control circuit (10). During dehydration, the triac (2) is on and the dehydration tank (7) is rotating at high speed. Immediately after completion of dehydration, the triac is controlled by the triac control circuit (10).
(2) is turned off and the triac (3) is turned on instead.

Then, the motor (5) generates a reverse rotation torque to apply an electric brake to the dehydration tank (7). When the rotation speed detection circuit (8) detects that the rotation speed of the dehydration tank (7) has become substantially zero, the triac (3) is turned off.

Example 4. FIG. 8 shows the first and fifth aspects of the present invention.
It is an electric-brake operation | movement characteristic view which shows one Example of invention.
1 and 2 are also used in the fourth embodiment. Figure 8 (a)
Shows the rotation speed change of the dehydration tank (7), and FIG. 8 (b) shows the on / off control timing of the triacs (2) and (3) by the triac control circuit (10). During dehydration, the triac (2) is on and the dehydration tank (7) is rotating at high speed. Immediately after dehydration, the triac (2) is turned off by the triac control circuit (10), and instead the triac (3) is turned off.
Is turned on by phase control, the motor (5) generates a reverse rotation torque to apply an electric brake to the dehydration tank (7).

Here, as in the third embodiment, a triac is used.
When (3) is fully ignited, a reverse torque close to the starting torque is always generated, so the time to stop is short, but a large current flows until it stops. Therefore, the phase control is used to limit the current flowing through the M coil (5a) and the S coil (5b) of the motor (5). Phase control may fix the firing angle, or increase the firing angle in the initial stage (decrease the conduction angle) and decrease the firing angle as the rotation speed of the dehydration tank (7) decreases (conduction angle decreases). It may be increased) to control the current.

When the rotation speed detection circuit (8) detects that the rotation speed of the dehydration tank (7) has become almost zero, the triac (3) is turned off.

Example 5. FIG. 9 shows the first and sixth aspects of the present invention.
It is an electric-brake operation | movement characteristic view which shows one Example of invention.
Note that FIGS. 1, 2 and 4 are also used in the fifth embodiment. 9 (a) is a change in applied fundamental frequency, FIG. 9 (b) is a change in rotation speed of the dehydration tank (7), and FIG. 9 (c) is a triac control circuit (10).
The following shows the switching timing of the triacs (2) and (3).
Similar to the first and second embodiments, the triac control circuit
Turn on / off the triac (2) with (10), and
As shown in, the frequency applied to the motor (5) is set to f / N.

In Example 5, the spin speed of the dehydration tank (7) was f /
When the synchronous rotation speed of the motor (5) near the N frequency is reached, the triac control circuit (10) activates the triac.
By turning off (2) and turning on the triac (3),
When the electric brake ceases to operate near the synchronous rotation speed of f / N (first predetermined value), a reverse torque is generated to further apply the electric brake to the dehydration tank (7). When the rotation speed detection circuit (8) detects that the rotation speed of the dehydration tank (7) has decreased to substantially zero due to the reverse rotation torque brake (second predetermined value), the triac (3) is turned off.

This is because the reverse torque brake by the triac (3) is a triac even after the dehydration tank (7) is stopped.
This is because, if (3) is kept on, the dehydration tank (7) acts so as to rotate in the reverse direction. D is the reverse torque braking period. The TRIAC (3) is a motor with phase control.
The current of (5) may be controlled. in this way,
When the braking of the motor (5) by applying the f / N frequency is no longer effective, a reverse torque is generated in the motor (5),
Since the brake is continuously applied until the motor (5) stops, the dehydration tank (7) can be stopped in a short time.

Example 6. FIG. 10 is an electric brake operation characteristic diagram showing an embodiment of the seventh invention of the present invention. In addition,
1, 2 and 4 are also used in the sixth embodiment. Figure 10
10 (a) is a change in applied fundamental frequency, FIG. 10 (b) is a change in rotation speed of the dehydration tank (7), and FIG. 10 (c) is a triac control circuit (1
The switching timing of triacs (2) and (3) by 0) is shown. As in the second embodiment, the triac control circuit (10) controls the on / off of the triac (2) to change the applied frequency to the motor (5) to f / N ₁ , as shown in FIG. 10 (a). f /
N ₂ , f / N ₃ , ... F / Nn.

Then, at the time when the electric brake does not act on the motor (5) in the vicinity of the synchronous rotation speed of f / Nn, the triac control circuit (10) turns off the triac (2) and turns on the triac (3). Generate reverse torque in the motor (5). The rotation speed detection circuit (8) indicates that the motor (5) has stopped.
When the is detected, the triac (3) is turned off.

Example 7. 11 and 12 are views showing one embodiment of the first and eighth inventions of the present invention, FIG. 11 is a drive circuit diagram, and FIG. 12 is an electric brake operation characteristic diagram. FIG.
In (1), (16) is a triac which is connected in series with the phase advancing capacitor (4) and controlled by the control signal (10c) from the control circuit (10), and (17) is parallel to the S coil of the motor (5). It is a triac connected and similarly controlled by the control signal (10d).

Next, the operation of this embodiment will be described with reference to FIG. FIG. 12 (a) shows a change in the rotation speed of the dehydration tank (7), and FIG.
2 (b) shows the operation timing of the triacs (2) (16) (17). During dehydration, the triac (16) is always on and the triac (17) is always off. At the end of dehydration, the triac control circuit (10) controls the triac (16) to be turned off and the triac (17) to be turned on. By this operation, the phase advancing capacitor (4) is opened, and the S of the motor (5) is
Both ends of the coil (5b) are short-circuited.

Therefore, a commercial power source is used for the M coil (5a).
(1) is applied and the rotor is excited by the M coil (5a). Since the rotor is rotating, a rotating magnetic field will be generated in the rotor, and the rotating magnetic field is received by the S coil (5b) and the short circuit of the S coil (5b may occur (may be short-circuited through a resistor)). By consuming it, an electric brake acts on the motor (5). This electric brake is a motor (5)
The braking force is stronger when the is rotating at a higher speed, but the braking force does not act when the rotation speed is low.

Then, when the braking force becomes weak, the triac (16) is turned on and the triac (17) is turned off.
The disconnected phase advancing capacitor (4) and the short-circuited S coil (5b) are restored. At the same time, the triac (2) for driving the motor is turned off, and the motor (5) is naturally stopped by free running. This electric brake requires a triac (16) (17), but the detection of the rotation speed of the dehydration tank (7) is not so important. Motor (5) slows down, speed detection circuit (8)
Even if omitted, the time reduction function by the brake is not impaired so much, and the triac control circuit (10) becomes small.

For example, in the second embodiment, when the frequency applied to the motor (5) becomes equal to or lower than the synchronous rotation speed of the motor (5), the braking action disappears, and the motor rotates at the rotation speed or lower (in a slipped state). Will continue. Therefore, the rotation speed detection circuit (8) is used to detect the rotation speed of the dehydration tank (7) to maximize the braking function, or even if the braking function is sacrificed to some extent, the rotation speed detection circuit It will be selected whether to omit (8). In the seventh embodiment, the S coil (5b) is short-circuited at the end of dehydration.
The same function can be obtained even if the coil (5a) is short-circuited.

Example 8. FIG. 13 is an electric brake operation characteristic diagram showing one embodiment of the first and ninth inventions of the present invention. Note that FIG. 11 is also used in the eighth embodiment. Figure 13 (a)
Shows the change in the rotation speed of the dehydration tank (7), and FIG. 13 (b) shows the operation timing of the triacs (2) (3) (16) (17). At the end of the dehydration, the procedure is the same as in the seventh embodiment until the S coil (5b) of the motor (5) is short-circuited and the electric brake is actuated.

The end of the braking period B, that is, the time when the braking force becomes weak (the timing is earlier than that in FIG. 12).
The triac (16) is turned on, the triac (17) is turned off, and the advanced capacitor (4) and the shorted S
Restore the coil (5b). At the same time, the triac (2) for driving the motor is turned off, the triac (3) is turned on, and the reverse torque is generated in the motor (5). When the speed detection circuit (8) detects that the motor (5) has stopped, the triac
Turn off (3).

Example 9. 14 and 15 are views showing one embodiment of the first and tenth inventions of the present invention, FIG. 14 is a drive circuit diagram, and FIG. 15 is a waveform diagram for explaining frequency division.
In FIG. 14, (20) and (21) are controlled by the control signals (10e) and (10f), and the triac for applying the commercial power source (1) to the motor (5) in the order phase, and (22) and (23) are the control signals. It is a triac that is controlled by (10g) and (10h) and applies the commercial power supply (1) to the motor (5) in opposite phase.

Next, the triacs (20) to (23) are controlled so that the frequency applied to the motor (5) is the frequency f of the commercial power source (1).
The procedure for changing to f / N will be described with reference to FIG. FIG.
(a) shows the voltage change of the commercial power supply (1). FIG. 15 (b) shows the change in the voltage applied to the motor (5) when the triacs (20) (21) are turned on by the control signals (10e) (10f), and FIG. 15 (c) shows the triacs (22) ( The change of the applied voltage to the motor (5) when the control signal (10g) (10h) is turned on to the motor (23) is shown. It can be seen that the applied voltage to the motor (5) differs by 180 degrees between FIG. 15 (b) and FIG. 15 (c).

The triacs (20) and (21) are used as the phase control elements, and the triacs (22) and (23) are used as the antiphase control elements. Either of the elements is selected in half-wave units of the commercial power supply (1) voltage. Then, the applied voltage is f / 2 in the case of FIG.
The applied voltage is f / 3 in the case of 5 (e), and f in the case of FIG. 15 (f).
It is possible to generate an applied voltage of f / N of the commercial power source (1) such as / 4.

[0061]

As described above, in the first invention of the present invention, the electric brake force is generated in the motor of the dehydration tub for both washing and dehydration at the end of the dehydration operation. The rotation speed of the water tank can be rapidly reduced, the process can proceed to the next stroke quickly, and the washing time can be shortened. Further, in the second aspect of the invention, immediately after the spin-drying operation is finished, the frequency applied to the motor is reduced to the frequency division frequency of the power supply frequency, and then the power supply to the motor is stopped. The electric brake acts until the rotational speed becomes synchronous with the frequency, so that the washing time can be shortened and the device can be simplified.

Further, in the third invention, immediately after the dehydration operation is finished, the frequency applied to the motor is gradually reduced to the frequency division frequency of the power source frequency in accordance with the rotation speed of the motor, and when the rotation speed reaches a predetermined value. Since the energization of the motor is stopped, the dehydration tub is decelerated by the electric braking force corresponding to its rotation speed, and a high braking force is obtained, and the washing time can be shortened.

Further, in the fourth aspect of the invention, the motor is energized so as to drive it in the reverse direction immediately after the dehydration operation is completed, and the energization of the motor is stopped when the rotation speed of the motor reaches a predetermined value. Is decelerated by the reverse torque of the motor, and the brake can be applied until the motor is completely stopped, which has the effect of shortening the washing time.

Further, in the fifth aspect of the invention, the motor is driven in the reverse direction immediately after the dehydration operation is completed, and the energization angle is gradually increased by the phase control so that the energization of the motor is stopped when the rotation speed of the motor reaches a predetermined value. As a result, a large current due to energization in the reverse direction is suppressed, the current can be controlled within the allowable current of the circuit, and the washing time can be shortened.

Further, in the sixth invention, the frequency applied to the motor is reduced to the frequency dividing frequency of the power supply frequency immediately after the completion of the dehydration operation, and in the seventh invention, the frequency is gradually reduced corresponding to the rotation speed of the motor. When the rotation speed of the motor reaches the first predetermined value, the motor is energized so as to drive the motor in the reverse direction, and when it reaches the second predetermined value, the power supply to the motor is stopped. Even when the frequency becomes lower than the frequency division frequency, the dehydration tub can be stopped early by applying the electric brake, and the washing time can be shortened.

Further, in the eighth aspect of the invention, the main winding or the auxiliary winding of the motor is short-circuited immediately after the dehydration operation is finished, and the energization of the motor is stopped when the rotation speed of the motor decreases. Even if it is not detected, sufficient braking force can be obtained, and the washing time can be shortened.

In the ninth aspect of the invention, the main winding or the auxiliary winding of the motor is short-circuited immediately after the dehydration operation, and when the rotation speed of the motor decreases, the motor is energized so as to drive in the reverse rotation direction to rotate the motor. Since the motor is stopped from being energized when the speed reaches a predetermined value, the braking force is strengthened, and it is possible to stop the dehydration tub even faster than in the eighth aspect of the invention, and it is possible to shorten the washing time. There is.

Further, in the tenth aspect of the invention, since the voltage of the order phase or the opposite phase is applied to the motor to change the frequency applied to the motor to the frequency dividing frequency, the commercial power supply frequency is sufficiently frequency-divided. , There is an effect that can strengthen the electric braking force.

[Brief description of drawings]

FIG. 1 is a drive circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining the operation principle showing the first embodiment of the present invention.

FIG. 3 is an electric brake operation characteristic diagram showing the first embodiment of the present invention.

FIG. 4 is a waveform diagram for explaining a frequency dividing operation according to the first embodiment of the present invention.

FIG. 5 is an actual measurement diagram of deceleration time showing the first embodiment of the present invention.

FIG. 6 is an electric brake operation characteristic diagram showing the second embodiment of the present invention.

FIG. 7 is an electric brake operation characteristic diagram showing the third embodiment of the present invention.

FIG. 8 is an electric brake operation characteristic diagram showing the fourth embodiment of the present invention.

FIG. 9 is an electric brake operation characteristic diagram showing the fifth embodiment of the present invention.

FIG. 10 is an electric brake operation characteristic diagram showing the sixth embodiment of the present invention.

FIG. 11 is a drive circuit diagram showing a seventh embodiment of the present invention.

FIG. 12 is an electric brake operation characteristic diagram showing the seventh embodiment of the present invention.

FIG. 13 is an electric brake operation characteristic diagram showing the eighth embodiment of the present invention.

FIG. 14 is a drive circuit diagram showing a ninth embodiment of the present invention.

FIG. 15 is a waveform diagram for explaining frequency division showing the ninth embodiment of the present invention.

[Explanation of symbols]

1 commercial power source, 2, 3, 16, 17, 20 to 23 control element (triac), four-phase capacitor, 5 single-phase induction motor, 5a main winding (M coil), 5b auxiliary winding (S coil), 7 dehydration tank, 8 rotation speed detection circuit, 1
0 Braking force control means (triac control circuit).

Claims (10)

[Claims] 1. A washing machine in which a dewatering tub for washing and dewatering is connected to a single-phase induction motor, and two control elements connected to the motor drive the motor in both forward and backward directions. A dehydration control device for a washing machine, comprising: a braking force control means for controlling the control element to generate an electric braking force on the motor. 2. The braking force control means is configured to stop energization to the motor after the frequency applied to the motor is reduced to the frequency dividing frequency of the power supply frequency immediately after the dehydration operation is completed. Item 1. A dehydration control device for a washing machine according to Item 1. 3. A rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means sets the frequency applied to the motor immediately after the completion of the dehydration operation to the frequency dividing frequency of the power supply frequency, and the detected rotation speed. 2. The washing machine dehydration control device according to claim 1, wherein the motor is de-energized when the detected rotation speed reaches a predetermined value. 4. A rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means is energized so as to drive the motor in the reverse direction immediately after the completion of the dehydration operation, and the detected rotation speed is predetermined. 2. The dehydration control device for a washing machine according to claim 1, wherein when the value becomes a value, the power supply to the motor is stopped. 5. A rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means controls the motor to rotate in the reverse direction when the dehydration operation is completed by controlling one of the control elements and the other of the control elements is controlled. 2. The dehydration control of a washing machine according to claim 1, characterized in that, when the motor is driven, the energization angle is gradually increased by the phase control and the energization to the motor is stopped when the detected rotation speed reaches a predetermined value. apparatus. 6. A rotation speed detection circuit for detecting the rotation speed of the motor is provided, and the braking force control means sets the frequency applied to the motor to the frequency division frequency of the power supply frequency immediately after the completion of the dehydration operation by the control of one of the control elements. When the detected rotational speed is reduced to a first predetermined value, the other one of the control elements is controlled to energize so as to drive the motor in the reverse direction,
2. The dehydration control device for a washing machine according to claim 1, wherein the power supply to the motor is stopped when the second predetermined value is reached. 7. The dehydration control device for a washing machine according to claim 6, wherein the frequency division frequency is reduced stepwise according to the detected rotation speed. 8. A dehydration tub for both washing and dehydration is coupled to a single-phase induction motor having a main winding and an auxiliary winding, and the motor is controlled by a control element connected to the main winding and the auxiliary winding. In a washing machine driven in both forward and reverse directions, a control element for short-circuiting the main winding or the auxiliary winding when operating is provided, and the short-circuiting control element is operated after the dehydration operation is completed. A dewatering control device for a washing machine, comprising a braking force control means for stopping energization to the washing machine. 9. A rotation speed detection circuit for detecting the rotation speed of the motor is provided, the braking force control means operates the short-circuit control element after completion of the dehydration operation, and when the rotation speed of the motor decreases, the motor is rotated in the reverse direction. 9. The dehydration control device for a washing machine according to claim 8, wherein power is supplied to drive the motor, and power is supplied to the motor when the detected rotation speed reaches a predetermined value. 10. A ranking phase control element inserted between a commercial power source and a motor, and connected between one power supply side of the ranking phase control element and the other motor side of the ranking phase control element, respectively. And a reverse phase control element, and operates the order phase control element or the reverse phase control element to apply a voltage of the order phase or the reverse phase to the motor to change the frequency applied to the motor to the dividing frequency. The dehydration control device for a washing machine according to any one of claims 2, 3, 6, and 7, wherein the dehydration control device is configured to perform.