JP6334419B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine.

  The washing machine has a washing process and an irrigation process in which water is accumulated in the tank and a stirring operation is performed, and a dehydration process in which the tank is rotated at a high speed. In the dehydration process, the tank is rotated at a specified number of rotations and a specified time, and when the operation is completed, the tank is decelerated by the motor brake, and after confirming by the sensor that the motor is completely stopped, the process proceeds to the next process. During the tank rotation operation in the dehydration process, vibration may increase at a specific rotation speed due to motor resonance, and noise may increase due to vibration. In Japanese Patent Laid-Open No. 2006-141566 (Patent Document 1), the target rotational speed and the maximum rotational speed are adjusted based on the vibration amount and rotational speed of the tank.

  When passing through the resonance section in the tank rotation acceleration operation at the time of dehydration, if the rotation acceleration is small, the execution time of the resonance section becomes long, so that the vibration tends to increase, and the time during which the vibration becomes large is also long. For this reason, by increasing the acceleration rate in the vicinity of the resonance section and allowing it to pass through the resonance section in a shorter time, vibration and noise generated in the dehydration process are suppressed.

JP 2006-141566 A

  However, when the tank rotation operation in the dehydration process is finished and the motor is stopped, the larger the deceleration rate, the larger the current flowing through the motor, so the electromagnetic excitation force increases. Therefore, depending on the characteristics of the motor, there are cases where vibration and noise cannot be reduced even if the resonance section is passed with a large deceleration rate. On the other hand, if the deceleration rate of the motor is too small, the execution time of the dehydration process becomes long.

  In view of the above problems, an object of the present invention is to provide a washing machine capable of reducing noise and preventing the execution time of a dehydration process from being prolonged.

In order to achieve the object, as an example, an outer tub disposed in an outer frame, an inner tub rotatably provided in the outer tub and containing laundry, and a motor for driving the inner tub , A rotation speed detection means for detecting the rotation speed of the motor, and an operation control means for controlling a deceleration rate of the motor, wherein the operation control means is configured to determine whether the rotation speed at the start of deceleration of the motor is larger or smaller than a threshold value. And the deceleration rate of the motor is switched according to the comparison result .

  ADVANTAGE OF THE INVENTION According to this invention, while reducing noise, the washing machine which can prevent the prolongation of the execution time of a dehydration process can be provided.

Structural drawing of a washing machine showing an embodiment of the present invention The block diagram which shows the form of the Example of this invention The flowchart which shows the control content in the Example of this invention Rotation speed threshold value and deceleration rate setting value in the embodiment of the present invention

  Embodiments will be described below with reference to the drawings.

  FIG. 1 is a structural diagram of the washing machine of this embodiment.

  In FIG. 1, 1 is a casing of a washing machine. An outer tub 2 is attached in the housing 1. An inner tub 3 is accommodated in the outer tub 2, and the inner tub 3 is connected coaxially to the main motor 5 and is rotatable. The clutch 11 is used to fix the main motor 5 and the inner tank 3 and rotate the entire inner tank 3, or to fix the pulsator 4 and rotate the pulsator, and is connected to the upper part of the main motor 5. Has been.

  Tap water is supplied from the water supply hose 15 to the outer tub 2 through the water supply valve 12 and the softener valve 13. The water accumulated in the outer tub 2 can be discharged to the drain port 8 through the drain hose 7 by opening the drain valve 6. The drain valve 6 is opened and closed by a drain valve driving motor 9.

  FIG. 2 is a block diagram of the washing machine of the present embodiment.

  The washing machine is controlled by the microcomputer 104, and the main motor 111, the circulation pump 112, the bath water pump 113, the water supply valve 114, the drain valve via the load drive circuit 103 according to the input content of the operation switch 131 on the operation panel. 115, the softener valve 116 and the lid lock 117 are driven to perform the washing operation.

  In addition, the water level monitoring by the water level sensor 121, the temperature monitoring by the temperature sensor 122, the motor rotation speed by the rotation sensor 123, the safety lever 124 for detecting the shaking and preventing the outer frame of the washing tub from being hit, and the nonvolatile memory 125 The operation setting and information are stored by means of, and the operation state is displayed by the LED display circuit 132.

  Power is supplied from the power source 101 to the microcomputer 104, the load driving circuit 103, each sensor, and the like.

  FIG. 3 shows the flow of the dehydration process operation of the washing machine of this embodiment. FIG. 4 shows the rotational speed threshold value / deceleration rate setting value in this embodiment. In FIG. 4, it is assumed that the rotation speed range R3 to R2 is a resonance interval, the deceleration rate br13 is smaller than the deceleration rates br11, br12, br14, and br15, and the deceleration rate br23 is smaller than the deceleration rates br21, br22, br24, and br25. .

  In the dehydration process, first, water accumulated in the washing tub is drained from the drain port (FIG. 3-S301). When drainage is completed, the main motor starts to rotate the inner tub and dehydrates the clothes (FIG. 3-S302). In the tank rotation operation, the rotation speed, acceleration, and the like are set in advance as a rotation pattern, and the main motor is operated at an appropriate target rotation speed, acceleration, etc. based on the set rotation pattern and dehydration execution time. When the rotation pattern is completed, the main motor starts decelerating (S303 in FIG. 3).

  When the main motor is decelerated from a high-speed rotation state to a stop, noise may occur due to motor resonance. Therefore, motor rotation speed determination (FIG. 3-S311 to S314, FIG. 3-S321 to S324) for detecting the rotation speed of the motor and selecting an appropriate deceleration rate is performed. After determining the motor rotation speed section, a deceleration rate corresponding to the rotation speed is set (FIGS. 3-S315 to S319, FIGS. 3-S325 to S329). Because of the magnitude relationship of the deceleration rate, the resonance zone, which is the use zone of the deceleration rate br13 or br23, operates at a low deceleration rate, so it operates with low noise, and a larger deceleration rate is used outside the resonance zone, so the time until stopping It can prevent the time from becoming longer. Further, since the other sections are operated at a deceleration rate larger than the deceleration rate br13, it is possible to prevent the dehydration process from being prolonged.

  Thereafter, it is determined whether or not the motor is stopped (S331 in FIG. 3). When the motor is stopped, the dehydration process is terminated. When the motor is not stopped, the above operation [FIGS. 3-304 to 329] is repeated.

  Further, when setting the deceleration rate based on the rotational speed information from the rotational speed sensor, the rotational speed at the start of motor deceleration is compared with the threshold value ST (S304 in FIG. 3). This is because the motor noise may be generated differently depending on the rotation speed at the start of motor deceleration even with the same rotation speed / deceleration rate. The determination result of FIG. ) And FIG. 4-deceleration rate setting (2), an appropriate deceleration rate pattern can be selected.

  Further, in FIG. 4, there are cases where the section where the rotational speed is R3 to R2 is the resonance section where the noise is the highest, and the section where R4 to R3 is the resonance section where the noise is the next highest. In this case, the deceleration rate br13 is smaller than the deceleration rates br11, br12, br14, and br15, and br14 is smaller than br11, br12, and br15, and the deceleration rate br23 is smaller than the deceleration rates br21, br22, br24, and br25, And br24 is smaller than br21, br22 and br25. By setting the deceleration rate in multiple stages in this way, it is possible to reliably reduce the noise and prevent the dehydration process from taking longer than the motor stop operation with a single deceleration rate setting.

  Further, the resonance section may differ depending on the number of rotations during deceleration. In this case, it is desirable to vary the magnitude relationship between the actual rotational speed of the motor and the deceleration rate depending on the rotational speed during deceleration. For example, in FIG. 4, the actual motor speed and the deceleration are reduced when the deceleration rate is set so that the rotational speed when the motor is decelerated is smaller than the threshold value and when the deceleration rate is set when the rotational speed when the motor is decelerated is larger than the threshold value Different rates in size. Thereby, it is possible to cope with the case where the resonance section differs depending on the rotation speed during deceleration.

  As described above, in the stop process from the motor high-speed rotation state in the dehydration process, setting an appropriate motor deceleration rate based on the rotation speed information from the running speed sensor makes it possible to reduce noise compared to a motor stop operation with a constant deceleration rate. It becomes possible to reduce. Further, since the sections other than the resonance section are operated at a deceleration rate larger than the deceleration rate of the resonance section, it is possible to prevent the dehydration process from being performed for a long time.

1: Main body / outer frame, 2: outer tank, 3: inner tank,
4: Pulsator, 5: Main motor, 6: Drain valve,
7: Drain hose, 8: Drain port, 9: Drain valve drive motor,
10: Control board, 11: Clutch, 12: Water supply valve,
13: Softener valve, 14: Operation panel, 15: Water supply hose,
16: Safety lever,

101: Power supply, 102: Auto-off relay,
103: driving circuit, 104: microcomputer,
111: Main motor, 112: Circulation pump,
113: Bath water pump, 114: Water supply valve,
115: Drain valve, 116: Sofna valve,
117: lid lock,
121: Water level sensor, 122: Temperature sensor,
123: Rotation sensor, 124: Safety lever,
125: non-volatile storage device,
131: Operation switch, 132: LED display circuit,

Claims (2)

An outer tank placed in the outer frame;
An inner tub that is rotatably provided in the outer tub and accommodates laundry;
A motor for driving the inner tank;
A rotational speed detecting means for detecting the rotational speed of the motor;
Comprising an operation control means for controlling a deceleration rate of the motor;
The operation control means compares the rotational speed of the motor at the time of deceleration start and a threshold value, and switches the motor deceleration rate according to the comparison result . A washing machine according to claim 1,
The said operation control means holds the table of the deceleration rate for every some rotation speed area | region of the said motor, Based on the said table, it switches to the corresponding deceleration rate, The washing machine characterized by the above-mentioned.