JP2012179080A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine that has a construction for decelerating a rotation of a rotary tub by reversely braking at the end of dewatering, and is capable of preventing a reverse rotation of the rotary tub while reducing cost by using a rotation sensor with a low detection accuracy.SOLUTION: The washing machine is provided with a washing machine motor including a single-phase induction motor and a rotation sensor for detecting a rotational speed of a rotary tub. A control means applies an AC voltage to the washing machine motor so as to rotate in one direction based on the detection result of the rotation sensor at the time of dewatering, and thus performs dewatering by rotating the rotary tub at a prescribed rotational speed. At the end of dewatering, an AC voltage is applied to the washing machine motor so as to rotate in a reverse direction, and the rotation of the rotary tub is decelerated by reverse braking. Further, when the rotational speed of the rotary tub is decelerated to a prescribed set value or below, the rate of voltage applied to the washing machine motor is reduced compared to the case where the rotational speed of the rotary tub exceeds the set value.

Description

  Embodiments described herein relate generally to a washing machine.

  In a washing machine, for example, a fully automatic washing machine, a water receiving tank that is elastically supported in an outer box, a rotating tank provided in the water receiving tank, and a single-phase induction motor that rotationally drives the rotating tank There is a thing provided with the washing machine motor which consists of, and the rotation sensor which detects the rotation speed (rotation speed) of a rotation tub. In this type of washing machine, an AC voltage is applied to the washing machine motor so that the rotating tub rotates in one direction during dehydration. Also, in this type of washing machine, at the end of dehydration, an AC voltage is applied to the washing machine motor so that the rotating tub rotates in a direction opposite to the one direction during dehydration, so that the rotation of the rotating tub is accelerated. Controls that execute so-called reverse braking for deceleration are proposed.

JP 2001-137596 A

  In a washing machine that decelerates rotation of the rotating tub by reverse braking at the end of dehydration, it is conceivable that the rotating tub rotates reversely at the end of dehydration if the detection accuracy of the rotation sensor is low. Therefore, it is necessary to use a rotation sensor with high detection accuracy, and there is a problem that it is expensive.

  Therefore, it is configured to decelerate the rotation of the rotating tank by reverse braking at the end of dehydration, and prevent reverse rotation of the rotating tank at the end of dehydration while reducing the cost by using a rotation sensor with low detection accuracy. Provide a washing machine that can be used.

  The washing machine according to the present embodiment includes a washing tub of a washing and dewatering tub into which laundry is charged, a washing machine motor including a single-phase induction motor that rotates the rotatory tub during dehydration of a washing operation, A rotation sensor that detects a rotation speed; and a control unit that executes a washing operation by controlling a load including the washing machine motor. The control means of the present embodiment applies an AC voltage to the washing machine motor so as to rotate in the one direction during dehydration based on the detection result of the rotation sensor, and rotates the rotating tub at a predetermined rotation speed. When the dehydration is completed, an AC voltage is applied to the washing machine motor so as to rotate in the reverse direction, and the rotation of the rotating tub is decelerated by reverse braking, and the rotation speed of the rotating tub is further reduced. When the speed is reduced below a predetermined set value, the ratio of the voltage applied to the washing machine motor is made smaller than when the rotational speed of the rotating tub exceeds the set value.

The figure which shows the rotational speed of the rotation tank at the time of the spin-drying | dehydration of the washing machine of 1st Embodiment, and completion | finish of spin-drying | dehydration. Longitudinal side view of washing machine Block diagram showing electrical configuration The figure which shows the relationship between the rotational speed of the rotation tank at the time of completion | finish of spin-drying | dehydration, and an electricity supply pattern Flow chart showing control of deceleration of rotating tank at end of dehydration FIG. 4 equivalent view showing the second embodiment It is a figure which shows the relationship of the phase control at the time of completion | finish of spin-drying | dehydration, (a) is a figure which shows the waveform of the alternating voltage of a commercial power supply, (b) is a figure which shows the detection position of a zero crossing point, (c) is a phase delay. The figure which shows, (d) is a figure which shows the alternating voltage applied to a washing machine motor Figure equivalent to FIG. FIG. 4 equivalent view showing the third embodiment The figure which shows the electricity supply pattern of the alternating voltage applied to the washing machine motor at the time of completion | finish of spin-drying | dehydration Figure equivalent to FIG.

Hereinafter, a plurality of embodiments applied to a fully automatic washing machine will be described with reference to the drawings.
(First embodiment)
Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 5.
The washing machine 1 shown in FIG. 2 includes a rectangular outer box 2 and a rectangular frame-shaped top cover 3 fixed to the upper surface of the outer box 2. A water receiving tank 4 is provided inside the outer box 2. The water receiving tank 4 is suspended and elastically supported by an elastic suspension mechanism 5. Inside the water receiving tub 4, a rotating tub 6 serving as a washing tub / dehydration tub into which laundry is put is rotatably provided. A plurality of dewatering holes 7 are formed in the peripheral wall portion of the rotating tub 6. A balance ring 8 is provided at the upper end of the rotating tub 6. A stirrer 9 is rotatably provided at the inner bottom of the rotary tank 6.

  A washing machine motor 10 and a mechanism unit 11 are provided on the lower surface of the water receiving tank 4. The washing machine motor 10 is composed of a single-phase induction motor, for example, a capacitor induction motor, and rotationally drives the rotating tub 6 in one direction and in a direction opposite to the one direction. Hereinafter, in the rotation direction of the rotating tub 6, one direction will be described as a “forward direction”, and a direction opposite to the one direction will be described as a “reverse direction”.

  The washing machine motor 10 is energized so as to alternately rotate in forward and reverse directions at the time of washing and rinsing in the washing operation, energized to rotate in one direction at the time of dehydration in the washing operation, and further, at the end of the dehydration, It is energized to rotate in the direction opposite to the direction of. That is, when the washing machine motor 10 is energized so that the washing machine motor 10 rotates in one direction, the washing tub motor 10 rotates in the forward direction and the washing machine motor 10 is opposite to the one direction. The rotating tub 6 is rotationally driven in the reverse direction by being energized so as to rotate in the direction.

Specifically, the rotation of the rotating shaft 12 of the washing machine motor 10 is transmitted to the input shaft 14 of the mechanism unit 11 via the belt transmission mechanism 13. The rotating shaft 12 of the washing machine motor 10 is mechanically connected to the input shaft 14 of the mechanism unit 11 through a belt transmission mechanism 13 including a pulley 13a, a belt 13b, and a pulley 13c.
The mechanism unit 11 includes an input shaft 14, a hollow output shaft 15a, an output shaft 15b inserted into the output shaft 15a, a clutch mechanism (not shown), and a speed reduction mechanism (not shown). Have. The upper end portion of the output shaft 15 a is connected to the bottom plate of the water receiving tank 4. Further, the output shaft 15 b of the mechanism portion 11 projects through the bottom plate of the rotating tub 6 and protrudes into the rotating tub 6. A stirring body 9 is connected to the upper end of the output shaft 15b.

  The clutch mechanism is mechanically disconnected during washing and rinsing in the washing operation, and transmits the rotation of the input shaft 14 to the output shaft 15a and the agitator 9 through the speed reduction mechanism. At the end, it is in a mechanically connected state, and the rotation of the input shaft 14 is transmitted to both the stirrer 9 and the rotating tub 6 via the output shafts 15a and 15b. Therefore, at the time of washing and rinsing in the washing operation, the agitator 9 rotates without being synchronized with the rotating tub 6 and rotates even when the rotating tub 6 is stopped. Further, at the time of dehydration and at the end of dehydration, the agitator 9 rotates in synchronization with the rotary tank 6 and rotates in the same direction as the rotary tank 6. Hereinafter, in the rotation direction of the stirrer 9, the same direction as one direction of rotation of the rotating tub 6 will be described as a “forward direction”, and a direction opposite to the one direction will be described as a “reverse direction”.

  A water supply valve 16 is provided in the upper part of the outer box 2. The inlet of the water supply valve 16 is connected to a water source such as a water tap, and the outlet of the water supply valve 16 is directed to the inside of the rotary tank 6. Thereby, the water supply valve 16 is energized so that tap water is injected into the rotating tub 6.

  A drain port 17 is formed at the bottom of the water receiving tank 6. The drain port 17 is connected to a drain hose 19 via a drain valve 18. The drain valve 18 is switched between an open state when energizing to open the drain port 17 and a closed state at the time of power disconnection closing the drain port 17. Thereby, in the open state of the drain valve 18, the washing water in the water receiving tank 4 is drained from the drain port 17 to the outside through the drain hose 19.

  The drain valve 18 also serves as a drive source for the clutch mechanism of the mechanism unit 11. The clutch mechanism is configured to mechanically interlock with the closed state and the open state of the drain valve 18 and to switch between the disconnected state and the connected state. That is, the drain valve 18 is in an open state when the rotating tub 6 and the stirrer 9 rotate synchronously, and the drain valve 18 is closed when the stirrer 9 rotates alone.

  An air trap 20 is formed in the water receiving tank 4. A water level sensor 22 is mechanically connected to the air trap 20 via an air tube 21. The water level sensor 22 detects the internal pressure of the air trap 20 via the air tube 21 and outputs a pressure signal at a level corresponding to the detected pressure.

  A lid 23 is rotatably provided on the top cover 3. The lid 23 opens and closes the opening of the top cover 3. An operation panel 24 is provided at the front portion of the top cover 3. As shown in FIG. 3, the operation panel 24 is provided with a plurality of operation switches 25. The plurality of operation switches 25 are electrically connected to the control device 26.

  The control device 26 is mainly composed of a microcomputer and corresponds to control means, and is provided on the lower surface of the operation panel 24 as shown in FIG. As shown in FIG. 3, a water level sensor 22 and a plurality of operation switches 25 are connected to the control device 26. Then, the control device 26 detects the water level in the water receiving tank 4, that is, in the rotating tank 6 based on the output signal from the water level sensor 22, and the plurality of operation switches based on the output signals from the plurality of operation switches 25. 25 operation details are detected.

  As shown in FIG. 3, a rotation sensor 27 that detects the rotation speed (number of rotations) of the rotating tub 6 is connected to the control device 26. The rotation sensor 27 is composed of a permanent magnet and a Hall IC, and is based on detecting the magnetic flux of the permanent magnet attached to the pulley 13c (see FIG. 2) on the input shaft 14 side of the mechanism unit 11 with the Hall IC. A rotation signal, that is, a pulse is output. In this embodiment, the rotation sensor 27 outputs one pulse by one rotation of the input shaft 14. With this configuration, for example, the control device 26 detects the rotation speed (the number of rotations) of the rotating tub 6 based on the output of the rotation signal of the rotation sensor 27 at the time of dehydration and completion of the washing operation.

  As shown in FIG. 3, loads such as the washing machine motor 10, the water supply valve 16, the drain valve 18, the indicator 29, and the buzzer 30 are connected to the control device 26 through the drive circuit 28. The control device 26 drives and controls the load based on output signals from the water level sensor 22, the plurality of operation switches 25, and the rotation sensor 27, and performs washing based on a control program recorded in the ROM of the control device 26. The operation is executed. The ROM also stores setting values, energization pattern control programs, and the like, which will be described later.

  The washing machine motor 10 rotates when an AC voltage such as a single-phase AC power supply voltage of 100 V is applied from a commercial power supply via the drive circuit 28. Hereinafter, this 100 V single-phase AC power supply voltage will be referred to as “AC voltage of commercial power supply”.

Next, the operation of the first embodiment will be described with reference to FIGS.
Based on the operation of the operation switch 25, the control device 26 executes control such as washing, rinsing, and dehydration in the washing operation. For example, if a standard course of operation is selected, the controller 26 performs washing, rinsing and dewatering controls.

  The control device 26 performs control to close the drain valve 18 shown in FIGS. 2 and 3, open the water supply valve 16, and supply tap water into the rotating tub 6 during washing. And the control apparatus 26 detects the water level in the rotating tank 6 based on the output signal from the water level sensor 22, and compares it with the preset set water level. When the control device 26 detects that the detection result of the water level has reached the set water level, the control device 26 closes the water supply valve 16 and executes control for alternately driving the washing machine motor 10 in one direction and in the opposite direction. At the time of washing, the control device 26 controls the rotating tub 6 to be stationary. Thereby, the stirring body 9 rotates in the forward and reverse directions. Therefore, a water flow is generated in the rotating tub 6 by the rotation of the stirring body 9, and the laundry in the rotating tub 6 is washed with the water flow.

When the control device 26 detects that the set time has elapsed since the start of washing, the control device 26 stops driving the washing machine motor 10, opens the drain valve 18, and discharges the water in the rotating tub 6.
Thereafter, the control device 26 proceeds to dehydration after repeating the same rinsing and drainage as the above-described washing a plurality of times.

  At the time of dehydration, the control device 26 closes the drain valve 18, opens the water supply valve 16, and performs control to supply tap water into the rotating tub 6. And the control apparatus 26 detects the water level in the rotating tank 6 based on the output signal from the water level sensor 22, and compares it with a setting water level. When the control device 26 detects that the detection result of the water level has reached the set water level, the control device 26 closes the water supply valve 16 and, as shown in FIG. 1, the commercial power supply so as to drive the washing machine motor 10 to rotate in one direction. The control which applies the alternating voltage of is performed. Thereby, the rotary tank 6 rotates in the forward direction at a predetermined rotation speed together with the stirring body 9. Specifically, as shown in FIG. 1, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 and stops the rotation speed of the washing machine motor 10 (0 rpm). And gradually maintaining the rotation speed at a predetermined high speed, for example, about 1300 rpm. Thereby, the rotating tank 6 and the stirring body 9 also rotate in the forward direction at a rotational speed of about 1300 rpm. Therefore, the water contained in the laundry in the rotary tub 6 moves from the dewatering hole 7 to the drain port 17 and the drain valve 18 by centrifugal force, and is drained from the drain hose 19 to the outside of the machine.

  When the control device 26 detects that the set time has elapsed since the start of dehydration, the control device 26 performs control to stop the rotation of the rotating tub 6. Specifically, the control device 26 determines the rotational speed of the rotating tub 6 based on the output signal from the rotation sensor 27 at the time of decelerating the rotation of the rotating tub 6 after the set time has elapsed from the start of the dewatering. While detecting this, control is performed to apply an AC voltage to the washing machine motor 10 so as to rotate in a direction opposite to the one direction during dehydration. That is, the control device 26 executes control to decelerate the drive of the washing machine motor 10 by reverse braking. By this reverse braking, the rotational speed of the rotating tub 6 in the positive direction is decelerated early.

  Further, when the rotation speed of the rotating tub 6 is decelerated, the control device 26 determines that the rotating speed of the rotating tub 6 exceeds the set value when the rotating speed of the rotating tub 6 is reduced to a predetermined value or less. Control is performed to make the ratio of the voltage applied to the washing machine motor 10 smaller than when the washing machine motor 10 is present. Hereinafter, control of the rotational speed of the rotating tub 6 of the control device 26 at the end of dehydration will be described. In addition, in the change at the time of deceleration of the rotational speed of the rotating tub 6 in FIG. 1, the change of this embodiment is indicated by “α”, and the change when the rotational speed of the rotating tub is decelerated by inertia as a comparative example is “ The change when the rotational speed of the rotating tub is decelerated by reverse braking by full energization is indicated by “γ”.

  Here, the resonance rotational speed of the supported structure supported by the elastic suspension mechanism 5 is about 200 rpm. That is, when the rotation speed of the rotating tank 6 is in the vicinity of the above-described resonance rotation speed, the supported structure is likely to generate abnormal vibration due to resonance, and for example, the amplitude of vibration of the water receiving tank 4 is likely to increase. The supported structures supported by the elastic suspension mechanism 5 include a water receiving tank 4, a rotating tub 6, a washing machine motor 10, a mechanism unit 11, a belt transmission mechanism 13, a water supply valve 16, a drain valve 18 and the like. In FIG. 1, “P” represents the resonance rotational speed of the supported structure supported by the elastic suspension mechanism 5.

  In addition, the above set value in this embodiment is a value lower than about 200 rpm that is the resonance rotational speed of the above-mentioned supported structure, for example, 180 rpm. That is, when the rotational speed of the rotating tub 6 is a set value, the supported structure is in a state in which it is difficult to resonate. In the following description, it is assumed that the set value is 180 rpm. In FIG. 1, this set value is indicated by “Q”.

  The control device 26 executes the control shown in FIG. 5 so as to decelerate the rotation of the rotating tub 6 at an early stage when the dehydration is completed and to prevent the supported structure from vibrating abnormally. FIG. 4 shows the relationship between the rotational speed of the rotating tub 6 when the rotation of the rotating tub 6 is decelerated and the energization pattern of the washing machine motor 10 at that time.

  When the dehydration is completed and the dehydration is completed, that is, when the rotation of the rotating tub 6 is decelerated, the control device 26 applies an AC voltage of a commercial power source to the washing machine motor 10 so as to rotate in the direction opposite to that during dehydration. Control is performed to decelerate the rotation of the rotating tub 6 by reverse braking. And the control apparatus 26 detects the rotational speed of the rotation tank 6 based on the output signal from the rotation sensor 27 while starting reverse braking (start) (step S1-S5). When the rotation speed of the rotating tub 6 is decelerated, when the set value exceeds 180 rpm (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step S5: NO), the control device 26 Until the rotational speed of the rotating tub 6 becomes 180 rpm or less, the AC voltage of the commercial power supply is applied, and the energization pattern 1 shown in FIG. Continue (step S6). Thereby, the rotational force in the direction opposite to that during dehydration is also applied to the rotating tub 6. That is, the rotation of the rotating tub 6 is decelerated early by reverse braking. At this time, since the fully energized AC voltage is applied to the washing machine motor 10, the speed at which the rotation of the rotating tub 6 decelerates rapidly decreases as shown in FIG. Therefore, when the rotation speed of the rotating tub 6 is reduced, the rotating speed of the rotating tub 6 passes in the vicinity of 200 rpm, which is the resonance rotating speed of the supported structure, in a short time. Therefore, the time during which resonance of the supported structure occurs when the rotation of the rotating tub 6 is reduced is shortened.

  Next, when the rotation of the rotating tub 6 is decelerated to make it difficult for the supported structure to resonate, that is, when the rotation speed of the rotating tub 6 is reduced to a set value of 180 rpm or less, the control device 26 rotates. Control is performed so that the ratio of the voltage applied to the washing machine motor 10 is smaller than when the rotational speed of the tub 6 exceeds the set value. Specifically, the control device 26 performs control to decrease the rotational speed of the washing machine motor 10 by intermittently applying an AC voltage to the washing machine motor 10. And the control apparatus 26 performs control which makes the ratio of the application time of an alternating voltage small as the rotational speed of the rotary tank 6 becomes small.

  In this embodiment, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27. And when the rotational speed of the rotating tub 6 is within a preset range, in this embodiment, more than 120 rpm and 180 rpm or less (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step (S5: YES), the control device 26 executes control to apply the AC voltage of the commercial power source to the washing machine motor 10 with the energization pattern 2 shown in FIG. 4 (step S7). In the energization pattern 2, the control device 26 intermittently applies the AC voltage of the commercial power source to the washing machine motor 10 with the application time applied to the washing machine motor 10 being 0.2 seconds and the disconnection time not being applied being 0.6 seconds. Apply to. That is, in the energization pattern 2, the time of the alternating voltage applied to the washing machine motor 10 is 25% of the time of full energization. As described above, since the AC voltage is intermittently applied to the washing machine motor 10, the power supplied to the washing machine motor 10 is less than that in the conduction pattern 1 in the energization pattern 2, and the washing is performed. The machine motor 10 is difficult to rotate, and the rotation speed of the rotating tub 6 is also smaller than that of the energization pattern 1. Therefore, even if the detection accuracy of the rotation sensor 27 is low, the rotation sensor 27 can easily detect the rotation of the rotating tank 6 and can prevent the rotating tank 6 from rotating backward due to reverse braking when the dehydration is completed.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. When the rotation speed of the rotating tub 6 exceeds 80 rpm and is 120 rpm or less (step S1: NO, step S2: NO, step S3: NO, step S4: YES), the control device 26 changes the AC voltage of the commercial power supply. Then, control is applied to the washing machine motor 10 by applying the energization pattern 3 shown in FIG. 4 (step S8). In the energization pattern 3, the control device 26 intermittently applies the AC voltage of the commercial power source to the washing machine motor 10 with the application time applied to the washing machine motor 10 being 0.2 seconds and the disconnection time not being applied being 0.8 seconds. Apply to. That is, in the energization pattern 3, the time of the AC voltage applied to the washing machine motor 10 is 20% of the time of full energization. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 2, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 2.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. When the rotation speed of the rotating tub 6 exceeds 60 rpm and is 80 rpm or less (step S1: NO, step S2: NO, step S3: YES), the control device 26 converts the AC voltage of the commercial power supply into the washing machine motor 10. The control to be applied with the energization pattern 4 shown in FIG. 4 is executed (step 9). In the energization pattern 4, the control device 26 intermittently applies an AC voltage to the washing machine motor 10, with the application time applied to the washing machine motor 10 being 0.1 seconds and the disconnection time not being applied being 0.9 seconds. Control is performed. That is, in the energization pattern 4, the time of the AC voltage applied to the washing machine motor 10 is 10% of the time when all the energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 3, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 3.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. Then, based on the output signal from the rotation sensor 27, when the rotation speed of the rotating tub 6 is more than 5 rpm and not more than 60 rpm (step S1: NO, step S2: YES), the control device 26 sends a signal to the washing machine motor 10. The control of the energization pattern 5 shown in FIG. 4, that is, the control that does not apply the AC voltage to the washing machine motor 10 (does not energize) is executed (step S10). That is, in the energization pattern 5, the rotating tub 6 rotates with inertia. Therefore, no electric power is supplied to the washing machine motor 10, and the rotational speed of the rotating tub 6 is also smaller than that of the energization pattern 4.

  Next, when the rotation speed of the rotating tub 6 is decelerated, when the rotation speed of the rotating tub 6 is 5 rpm or less based on the output signal from the rotation sensor 27 (step S1: YES), the controller 26 finishes the dehydration. It is determined that the dehydration is completed, and the series of dehydration control is terminated.

According to the above configuration, the following effects can be obtained.
In the present embodiment, the rotation of the rotating tub 6 can be decelerated early by reverse braking at the end of dehydration. Further, when the rotation speed of the rotating tub 6 is decelerated to a predetermined value or less at the end of dehydration, the voltage applied to the washing machine motor 10 is greater than when the rotating speed of the rotating tub 6 exceeds this set value. The ratio is reduced. Therefore, the washing machine motor 10 becomes difficult to rotate as the rotation of the rotating tub 6 is decelerated, and the rotating speed of the rotating tub 6 is further reduced. As a result, even when the detection accuracy of the rotation sensor 27 is low, the rotation sensor 27 can detect the rotation of the rotating tub 6. Therefore, reverse rotation of the rotating tub 6 can be prevented while reducing the cost by using the rotation sensor 27 having low detection accuracy.

  Since the set value is a value lower than the resonance rotational speed of the supported structure including the rotating tub 6, when the rotational speed of the rotating tub 6 is decelerated, the rotating speed of the rotating tub 6 is set from a high value during dehydration. The time required to reach the value, specifically, the time required for the rotational speed of the rotating tub 6 at the end of dehydration to reach the set value of 180 rpm from about 1300 rpm, which is the rotational speed at the time of high-speed dehydration, can be minimized. Therefore, it is possible to shorten the time during which the resonance of the supported structure occurs when the rotation of the rotating tub 6 is decelerated.

  When the rotational speed of the rotating tub 6 exceeds the set value when the rotational speed of the rotating tub 6 is decelerated, the entire energized voltage is applied to the washing machine motor 10, and as described above, the rotational speed of the rotating tub 6 is decelerated. The time can be shortened and the time at which resonance occurs can also be shortened. Further, since the AC voltage is intermittently applied to the washing machine motor 10 when the rotation speed of the rotation tank 6 is equal to or lower than the set value, the washing machine motor 10 is difficult to rotate as the rotation speed of the rotation tank 6 proceeds. Thus, the rotation speed of the rotating tub 6 is further reduced. Therefore, even when the detection accuracy of the rotation sensor 27 is low, the rotation sensor 27 can detect the rotation of the rotating tub 6.

  Further, since the ratio of the application time of the AC voltage is reduced as the rotation speed of the rotation tank 6 is reduced when the rotation of the rotation tank 6 is decelerated, the rotation sensor 27 detects when the rotation of the rotation tank 6 is low. Even if the accuracy is low, the rotation sensor 27 can detect the rotation of the rotating tub 6.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment, description is abbreviate | omitted, and only a different part is described. The set value of the second embodiment is the same as the set value of the first embodiment.
In the second embodiment, when the rotational speed of the rotating tub 6 exceeds the set value at the time of decelerating the rotation of the rotating tub 6 at the end of dehydration, a fully energized AC voltage is applied to the washing machine motor 10 to When the rotational speed of 6 is equal to or lower than the set value, a phase-controlled AC voltage, specifically, an AC voltage of energization patterns 6 to 10 shown in FIG. 6 is applied to the washing machine motor 10. Further, the control device 26 according to the second embodiment applies the phase-controlled AC voltage to the washing machine motor 10 when the rotation of the rotation tub 6 is decelerated, and performs phase control as the rotation speed of the rotation tub 6 decreases. Control to reduce the power supply rate is executed.

  The phase control will be described with reference to FIG. Although not shown, in the second embodiment, a power supply voltage detection circuit is connected to the control device 26 shown in FIG. With this configuration, the control device 26 detects the value of the AC voltage of the commercial power supply based on the detection signal of the power supply voltage detection circuit (not shown), and detects the zero cross point of this AC voltage. Yes.

Fig.7 (a) has shown the waveform of the alternating voltage of commercial power supply. In the waveform of FIG. 7, the hatched portion is energized.
FIG. 7B shows an example of a zero cross detection signal detected by the power supply voltage detection circuit. In this example, the rising edge of the pulse is the zero cross point of the AC voltage waveform of the commercial power supply. FIG. 7C shows a signal delayed by a certain phase with respect to the zero cross detection signal shown in FIG. 7B, for example, a gate control signal. Then, as shown in FIG. 7 (d), the control device 26 converts the AC voltage of the commercial power source to the washing machine motor between the rising position of the gate control signal and the zero cross point of the AC voltage waveform of the commercial power source. Control to be applied to the so-called phase control is executed.

  In addition, in FIG.7 (d), the ratio of the energized electric power which occupies for half-wave electric power is shown as energization rate (energization angle) Z (%). When the energization rate Z is 100%, all energization occurs, and when the energization rate Z is 0%, no AC voltage is applied to the washing machine motor 10. Moreover, the control apparatus 26 controls the magnitude | size of the electricity supply rate Z of phase control by adjusting the time of the phase delay shown in FIG.7 (c).

  As shown in FIGS. 6 and 8, the control device 26 of the second embodiment executes the energization pattern 6 instead of the energization pattern 1 of the first embodiment in the control at the time of deceleration of the rotation of the rotating tub 6. Then, the energization pattern 7 is executed instead of the energization pattern 2 of the first embodiment, the energization pattern 8 is executed instead of the energization pattern 3 of the first embodiment, and the energization pattern 4 of the first embodiment Instead, the energization pattern 9 is executed, and the energization pattern 10 is executed instead of the energization pattern 5 of the first embodiment.

  Specifically, as shown in FIG. 8, the control device 26 of the second embodiment is based on an output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated, as in the first embodiment. Then, the rotational speed of the rotating tub 6 is detected (steps S1 to S5). When the rotation speed of the rotating tub 6 exceeds 180 rpm (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step S5: NO), the control device 26 performs washing. The energization pattern 6 shown in FIG. 6, that is, the fully energized voltage is applied to the machine motor 10 to execute reverse braking control (step S11). Thereby, the effect similar to 1st step S6 is acquired.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. And when the rotational speed of the rotating tub 6 exceeds 120 rpm and is 180 rpm or less (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step S5: YES), the control device 26 performs washing. Control is applied to the machine motor 10 with the energization pattern 7 shown in FIG. 6 (step 12). In the energization pattern 7, the control device 26 executes control to apply an AC voltage whose phase is controlled to 40% to the washing machine motor 10. That is, in the energization pattern 7, the washing machine motor 10 is rotationally driven at 40% of the electric power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 6, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 6.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. When the rotation speed of the rotating tub 6 is more than 80 rpm and not more than 120 rpm (step S1: NO, step S2: NO, step S3: NO, step S4: YES), the control device 26 is connected to the washing machine motor 10. Control to be applied with the energization pattern 8 shown in FIG. 6 is executed (step 13). In the energization pattern 8, the control device 26 executes control to apply an AC voltage whose phase is controlled to 30% to the washing machine motor 10. That is, in the energization pattern 8, the washing machine motor 10 is rotationally driven at 30% of the power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 7, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 7.

  Next, the control device 26 detects the rotational speed of the rotating tub 6 based on the output signal from the rotation sensor 27. When the rotation speed of the rotating tub 6 exceeds 60 rpm and is equal to or less than 80 rpm (step S1: NO, step S2: NO, step S3: YES), the control device 26 applies the energization pattern shown in FIG. The control applied at 9 is executed (step S14). In the energization pattern 9, the control device 26 executes control to apply an AC voltage whose phase is controlled to 20% to the washing machine motor 10. That is, in the energization pattern 9, the washing machine motor 10 is rotationally driven at 20% of the power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 8, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 8.

Next, when the rotation of the rotation tank 6 is decelerated, the rotation speed of the rotation tank 6 is detected based on the output signal from the rotation sensor 27. When the rotational speed of the rotating tub 6 exceeds 5 rpm and is equal to or lower than 60 rpm (step S1: NO, step S2: YES), the control device 26 controls the energization pattern 10 shown in FIG. Control that does not apply AC voltage to machine motor 10 (does not energize) is executed (step S15). Therefore, no electric power is supplied to the washing machine motor 10, and the rotational speed of the rotating tub 6 is also smaller than that of the energization pattern 9.
Next, when the rotation speed of the rotating tub 6 is decelerated, when the rotation speed of the rotating tub 6 is 5 rpm or less based on the output signal from the rotation sensor 27 (step S1: YES), the controller 26 finishes the dehydration. It is determined that the dehydration is completed, and the series of dehydration control is terminated.

According to the above configuration, the following effects can be obtained.
In this embodiment, similarly to the effect of the first embodiment, the rotation of the rotating tub 6 can be decelerated early by reverse braking at the end of dehydration, and this rotation is possible even when the detection accuracy of the rotation sensor 27 is low. The rotation of the rotating tub 6 can be detected by the sensor 27. Therefore, reverse rotation of the rotating tub 6 can be prevented while reducing the cost by using the rotation sensor 27 having low detection accuracy.

  When the rotation speed of the rotating tub 6 is reduced, the energization rate Z is reduced as the rotation speed of the rotating tub 6 decreases. Therefore, the washing machine motor 10 becomes difficult to rotate as the rotation speed of the rotating tub 6 progresses. The rotation speed of the rotating tub 6 is further reduced. Therefore, when the rotation speed of the rotary tank 6 is low, the rotation sensor 27 can detect the rotation of the rotary tank 6 even when the detection accuracy of the rotation sensor 27 is low.

(Third embodiment)
A third embodiment will be described with reference to FIGS. 9 to 11. Note that the same parts as those in the first and second embodiments are denoted by the same reference numerals, description thereof is omitted, and only different parts are described. The set value of the third embodiment is the same as the set value of the first embodiment.
In the third embodiment, when the rotational speed of the rotating tub 6 exceeds the set value at the time of decelerating the rotation of the rotating tub 6 at the end of dehydration, a fully energized AC voltage is applied to the washing machine motor 10, When the rotational speed of 6 is less than or equal to the set value, an AC voltage in which the number of positive / negative voltage waveforms applied to the washing machine motor 10 is adjusted, specifically, AC voltages of the energization patterns 11 to 15 shown in FIG. 9 are applied. It is the structure to do. In addition, the control device 26 of the third embodiment applies an alternating voltage adjusted to the number of positive / negative voltage waveforms applied to the washing machine motor 10 to the washing machine motor 10 when the rotation of the rotating tub 6 is decelerated. Then, control is performed to reduce the ratio of the number of positive / negative voltage waveforms applied as the rotational speed of the rotating tub 6 decreases.

  Control for applying an AC voltage in which the number of positive / negative voltage waveforms applied to the washing machine motor 10 is adjusted will be described with reference to FIG. In the third embodiment, the same power supply voltage detection circuit as that in the second embodiment is connected to the control device 26. That is, the control device 26 detects the AC voltage value of the commercial power supply based on the detection signal of the power supply voltage detection circuit (not shown), detects the zero cross point of the commercial power AC voltage, and performs phase control. It is something to do.

  FIG. 10A shows the waveform of the AC voltage of the commercial power supply. The waveform of the energization pattern 11 in this embodiment is shown. In the waveform of FIG. 10, the hatched portion is energized.

FIGS. 10B to 10D show AC waveforms in which the number of positive voltage waveforms applied to the washing machine motor 10 and the waveform of the negative voltage waveform are adjusted by phase control.
FIG. 10B shows the waveform of the energization pattern 12. In the energization pattern 12, the washing machine motor 10 is energized for one period of the AC voltage waveform, the next one period is interrupted, and the energization and disconnection are alternately performed every period. . In other words, in the energization pattern 12, the washing machine motor 10 has one positive pressure waveform half wave applied to the washing machine motor 10, one negative voltage waveform half wave applied, and a positive pressure waveform that is not applied. An alternating voltage consisting of one half wave and one half wave of a non-applied negative voltage waveform is energized. That is, in the energization pattern 12, the energization rate for energizing the washing machine motor 10 is half of that during full energization. Hereinafter, this waveform is referred to as “1/2 wave energization” (see FIG. 9).

  FIG. 10C shows the waveform of the energization pattern 13. In the energization pattern 13, the washing machine motor 10 is energized for one cycle after the positive half-wave of the AC voltage waveform is energized, then the negative half-wave is energized, and further de-energized for one cycle. Power interruption is repeated in which the positive half-wave is repeatedly energized. In other words, in the energization pattern 13, one half wave of the positive pressure waveform applied to the washing machine motor 10 and one half wave of the positive / negative voltage waveform that is not applied are applied to the washing machine motor 10 one by one. An alternating voltage is applied by repeating one half wave of the negative pressure waveform and one half wave of the positive / negative pressure waveform that is not applied. That is, in the energization pattern 13, the energization rate for energizing the washing machine motor 10 is 1/3 of the total energization. Hereinafter, this waveform is referred to as “1/3 wave energization” (see FIG. 9).

  FIG. 10D shows the waveform of the energization pattern 14. In the energization pattern 14, the washing machine motor 10 is turned off for two cycles after the positive half-wave of the AC voltage waveform is turned on, then the negative half-wave is turned on, and further turned off for two cycles. Power interruption is repeated in which the positive half-wave is repeatedly energized. In other words, in the energization pattern 14, one half wave of the positive pressure waveform applied to the washing machine motor 10 and two half waves of the positive / negative voltage waveform that are not applied are applied to the washing machine motor 10. An alternating voltage is applied by repeating one half wave of the negative pressure waveform and two half waves of the positive / negative voltage waveform that are not applied. That is, in the energization pattern 14, the energization rate for energizing the washing machine motor 10 is 1/5 of the total energization. Hereinafter, this waveform is referred to as “1/5 wave energization” (see FIG. 9).

The control device 26 adjusts the ratio of the number of positive / negative voltage waveforms of the AC waveform shown in FIGS. 10B to 10D by adjusting the phase delay time from the zero cross point.
In the third embodiment, as shown in FIG. 9 and FIG. 11, the control device 26 uses the energization pattern 11 instead of the energization pattern 1 of the first embodiment in the control at the time of rotation reduction of the rotating tub 6. The energization pattern 12 is executed instead of the energization pattern 2 of the first embodiment, the energization pattern 13 is executed instead of the energization pattern 3 of the first embodiment, and the energization pattern 4 of the first embodiment is executed. The energization pattern 14 is executed instead of the energization pattern 15, and the energization pattern 15 is executed instead of the energization pattern 5 of the first embodiment.

  Specifically, as shown in FIG. 11, the control device 26 of the third embodiment rotates based on the output signal from the rotation sensor 27 when the rotating tub 6 decelerates, as in the first embodiment. The rotational speed of the tank 6 is detected (steps S1 to S5). When the rotation speed of the rotating tub 6 exceeds 180 rpm (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step S5: NO), the control device 26 performs washing. The energization pattern 11 shown in FIG. 9, that is, the fully energized voltage is applied to the machine motor 10 to execute the reverse braking control (step S16). Thereby, the effect similar to 1st step S6 is acquired.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. And when the rotational speed of the rotating tub 6 exceeds 120 rpm and is 180 rpm or less (step S1: NO, step S2: NO, step S3: NO, step S4: NO, step S5: YES), the control device 26 performs washing. Control is applied to the machine motor 10 with the energization pattern 12 shown in FIG. 9 (step 17). In the energization pattern 12, the control device 26 executes control to apply an AC voltage to the washing machine motor 10 by “1/2 wave energization”. That is, in the energization pattern 12, the washing machine motor 10 is driven to rotate at half of the power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 11, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 11.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. When the rotation speed of the rotating tub 6 is more than 80 rpm and not more than 120 rpm (step S1: NO, step S2: NO, step S3: NO, step S4: YES), the control device 26 is connected to the washing machine motor 10. Control to apply with the energization pattern 13 shown in FIG. 9 is executed (step S18). In the energization pattern 13, the control device 26 executes control to apply an AC voltage to the washing machine motor 10 by “1/3 wave energization”. That is, in the energization pattern 13, the washing machine motor 10 is driven to rotate at 1/3 of the power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 12, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 12.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. Then, the rotational speed of the rotating tub 6 is detected. When the rotational speed of the rotating tub 6 exceeds 60 rpm and is 80 rpm or less (step S1: NO, step S2: NO, step S3: YES), the control device 26 applies the energization pattern shown in FIG. The control applied at 14 is executed (step S19). In the energization pattern 14, the control device 26 executes control to apply an AC voltage to the washing machine motor 10 by “1/5 wave energization”. That is, in the energization pattern 14, the washing machine motor 10 is driven to rotate at 1/5 of the power when all energization is performed. Therefore, the electric power supplied to the washing machine motor 10 is smaller than that in the energization pattern 13, and the rotation speed of the rotating tub 6 is also smaller than that in the energization pattern 13.

  Next, the control device 26 detects the rotation speed of the rotating tub 6 based on the output signal from the rotation sensor 27 when the rotation of the rotating tub 6 is decelerated. When the rotation speed of the rotating tub 6 exceeds 5 rpm and is equal to or less than 60 rpm (step S1: NO, step S2: YES), the control device 26 controls the energization pattern 15 shown in FIG. Control that does not apply AC voltage to the motor 10 (not energized) is executed (step S20). That is, in the energization pattern 15, the rotating tub 6 rotates with inertia. Therefore, no electric power is supplied to the washing machine motor 10, and the rotational speed of the rotating tub 6 is also smaller than that of the energization pattern 14.

  Next, when the rotation speed of the rotating tub 6 is decelerated, when the rotation speed of the rotating tub 6 is 5 rpm or less based on the output signal from the rotation sensor 27 (step S1: YES), the controller 26 finishes the dehydration. It is determined that the dehydration is completed, and the series of dehydration control is terminated.

According to the above configuration, the following effects can be obtained.
In this embodiment, as in the first and second embodiments, the rotation of the rotating tub 6 can be decelerated early by reverse braking at the end of dehydration, and even when the detection accuracy of the rotation sensor 27 is low, The rotation sensor 27 can detect the rotation of the rotating tub 6. Therefore, reverse rotation of the rotating tub 6 can be prevented while reducing the cost by using the rotation sensor 27 having low detection accuracy.

  This is a configuration in which the ratio of the number of positive / negative voltage waveforms to which an AC voltage is applied is reduced as the rotation speed of the rotary tank 6 is reduced when the rotation of the rotary tank 6 is decelerated. Therefore, the washing machine motor 10 becomes difficult to rotate as the rotation of the rotating tub 6 is decelerated, and the rotating speed of the rotating tub 6 is further reduced. As a result, even when the detection accuracy of the rotation sensor 27 is low, the rotation sensor 27 can detect the rotation of the rotating tub 6. Therefore, reverse rotation of the rotating tub 6 can be prevented while reducing the cost by using the rotation sensor 27 having low detection accuracy.

  As described above, the washing machine of the present embodiment can decelerate the rotation of the rotating tub early by reverse braking at the end of dehydration. Further, when the rotation speed of the rotating tub is decelerated to a predetermined value or less at the end of dehydration, the ratio of the voltage applied to the washing machine motor is set more than when the rotating speed of the rotating tub exceeds this set value. It is the structure which makes it small. Therefore, the washing machine motor becomes difficult to rotate as the rotation speed of the rotating tub progresses, and the rotating speed of the rotating tub becomes even smaller. As a result, even if the detection accuracy of the rotation sensor is low, the rotation sensor can detect the rotation of the rotation tank. Therefore, it is possible to prevent reverse rotation of the rotating tub while reducing the cost by using a rotation sensor with low detection accuracy.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The set value, the threshold value in the energization pattern, and the ratio of the alternating voltage applied in the energization pattern are merely examples, and can be changed as appropriate.
The embodiment of the washing machine is not limited to a so-called vertical axis type fully automatic washing machine, and can also be applied to a horizontal axis type drum type washing and drying machine including a rotating drum inside a horizontal axis type water tank.

  In the drawings, 1 is a washing machine, 6 is a rotating tub, 10 is a washing machine motor, 26 is a control device (control means), and 27 is a rotation sensor.

Claims (8)

A rotating tub of a washing and dehydrating tub into which the laundry is put;
A washing machine motor composed of a single-phase induction motor for rotating the rotating tub during dehydration in a washing operation;
A rotation sensor for detecting the rotation speed of the rotating tank;
Control means for controlling a load including the washing machine motor to execute a washing operation,
The control means includes
Based on the detection result of the rotation sensor, an AC voltage is applied to the washing machine motor so as to rotate in the one direction during dehydration, and the dehydration is performed by rotating the rotating tub at a predetermined rotation speed. Occasionally, an AC voltage is applied to the washing machine motor to rotate in the reverse direction to decelerate the rotation of the rotating tub by reverse braking, and the rotation speed of the rotating tub is set to a predetermined value or less. When the vehicle is decelerated, the ratio of the voltage applied to the washing machine motor is made smaller than when the rotation speed of the rotating tub exceeds the set value.   The washing machine according to claim 1, wherein the set value is a value lower than a resonance rotational speed of a supported structure including the rotating tub.   The control means applies a fully energized voltage to the washing machine motor when the rotation speed of the rotation tank exceeds the set value during deceleration of the rotation of the rotation tank, and the rotation speed of the rotation tank is set to the setting 3. The washing machine according to claim 1, wherein an alternating voltage is intermittently applied to the washing machine motor when the value is less than the value.   4. The washing machine according to claim 3, wherein the control means decreases the ratio of the application time of the AC voltage as the rotation speed of the rotating tub decreases when the rotation speed of the rotating tub decreases.   The control means applies a fully energized voltage to the washing machine motor when the rotation speed of the rotation tank exceeds the set value during deceleration of the rotation of the rotation tank, and the rotation speed of the rotation tank is set to the setting The washing machine according to claim 1 or 2, wherein an AC voltage subjected to phase control is applied to the washing machine motor when the value is equal to or less than the value.   6. The washing machine according to claim 5, wherein the control means decreases the energization rate of the phase control as the rotational speed of the rotating tub decreases as the rotational speed of the rotating tub decreases.   The control means applies a fully energized voltage to the washing machine motor when the rotation speed of the rotation tank exceeds the set value during deceleration of the rotation of the rotation tank, and the rotation speed of the rotation tank is set to the setting 3. The washing machine according to claim 1 or 2, wherein an AC voltage in which the number of positive / negative voltage waveforms applied to the washing machine motor is adjusted is applied when the value is equal to or less than the value.   8. The laundry according to claim 7, wherein the control means reduces the ratio of the number of applied positive / negative voltage waveforms as the rotational speed of the rotating tub decreases as the rotational speed of the rotating tub decreases. Machine.

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