KR19980067432A - Washing machine and driving motor control method - Google Patents

Abstract

The present invention provides a washing machine and a washing motor having a washing tank accommodating laundry to be washed, rotating water flow generating means for generating a forward and reverse rotational flow of the washing water in the washing tank, and a driving motor for forward and reverse driving of the rotating water flow generating means. A control method comprising: a flow rate detecting means for detecting a flow rate of a rotational flow of washing water in a washing tank; And a control unit for controlling the driving motor based on the detection signal from the flow rate detecting means. As a result, the on-off time of the driving motor is controlled relatively accurately, and thus no tangling of the laundry occurs, damage due to discoloration or discoloration is prevented and power consumption is reduced at the same time.

Description

Washing machine and driving motor control method

The present invention relates to a washing machine and a method of controlling a driving motor of a washing machine, and more particularly, a method of controlling a washing machine and a washing machine for detecting a rotational flow of washing water through a pressure sensor and intermittently driving the driving motor based on the pressure sensor. It is about.

As shown in FIG. 4, the washing machine 31 is provided with an outer tub 3 and a power distribution unit 11 up and down in the main body casing, and the outer tub 3 is damped by a suspension bar device 7. It is elastically fixed and has a cylindrical spin basket 5 rotatably installed therein. In the spin basket, there is provided a pulsator 9 in which the contained laundry is mixed with the washing water and the detergent supplied thereto and washed.

On the other hand, the power division transmission unit 11 is composed of a drive motor 13 and the shaft assembly (15). These drive motors 13 and the shaft assembly 15 are connected to each other through the drive pulley 17 and the belt 19, so that the driving force of the drive motor 13 is transmitted to the shaft assembly (15). The shaft assembly 15 receiving the rotation driving force selectively rotates the spin basket 3 or the pulsator 9 in a predetermined direction. That is, during washing and rinsing, the spin basket 3 is stopped and only the pulsator 9 is rotated to the left and right to perform the washing process, and during dehydration, the spin basket 3 and the pulsator 9 are rotated in one direction. Rotation is performed to dewatering process.

The washing machine 31 having such a configuration sequentially performs washing → rinsing → dewatering administration by a program stored in a control unit (not shown). In order to perform the washing operation, the control unit detects the amount of washing water accommodated in the spin basket through the quantity detecting unit to detect the set water level of the washing water. In addition, the controller detects the driving time of the driving motor 13, that is, the on-off time, by the output signal of the quantity detecting unit.

That is, when laundry is put into the spin basket and the operation of the device is started by external operation, the controller first opens the water supply valve to supply an appropriate amount of washing water. Then, when the water supply in the washing tank is completed, the drive motor is rotated clockwise or counterclockwise by the input AC power supply. At this time, when the driving motor 13 operates normally, the normal voltage of the driving motor 13 is applied to the quantity detecting unit, and the normal voltage is waveform-formed and input to the controller. Then, the control unit stops the driving of the driving motor 13 by cutting off the supply of the input AC power, and at this time, the driving motor 13 is not immediately stopped by the inertia force and gradually stops as the speed decreases. Done.

The driving stop of the driving motor 13 is stopped quickly by the friction force of the cloth when there is much laundry in the spin basket, and the laundry stops slowly as opposed to the enemy. On the other hand, according to this principle, the margin voltage is generated from the drive motor 13 which is gradually reduced in speed. Such a margin voltage is waveform-formed by the quantity detecting unit as shown in FIG. 5 and input to the controller.

That is, the excitation voltage generated by the rotation of the excitation of the driving motor 13 is half-wave rectified through the resistor R1 and the diode D1 and then turns on and off the light emitting device LED. Then, the light receiving element PT1 is turned on and off by an optical signal of the light emitting element LED to output a high or low pulse signal, and the high or low pulse signal is inverted through the transistor TR1 and at the same time waveform-shaped. After that, it is input to the input port P1 of the control unit 21. As a result, the control unit 21 sets one of the high water level, the medium water level, or the low water level according to the amount of laundry detected by the quantity detection unit 25 to supply the washing water in the outer tank.

On the other hand, when the washing water is supplied to the set water level in the outer tank, the control unit 21 proceeds to wash the laundry for the entire washing time set by the user before the operation of the device. At this time, the drive motor 13 alternately performs forward and reverse rotation to rotate the pulsator clockwise or counterclockwise, so that the on-off time of the drive motor 13 is also determined by the amount of laundry in the spin basket. do. That is, the controller 21 alternately repeatedly outputs a high signal and a low signal to the driving motor 13 according to the quantity detection signal from the quantity detecting unit 25 to wash the laundry for the entire washing time.

By the way, in such a washing machine 31, the washing performance of the laundry depends on the on-off time interval of the drive motor 13, that is, the right and left rotation of the pulsator 9, in the conventional washing machine, the quantity detection unit 25 Since the on-off time of the driving motor 13 is detected by the amount of laundry detected by the), the on-off time interval may be longer than necessary, thereby causing tangling of the laundry and causing user dissatisfaction. And, in the severe case, there is a problem that laundry can be discolored or discolored, causing deterioration of the device itself.

Accordingly, an object of the present invention, in consideration of the conventional problems, during the laundry administration of the laundry, by detecting the rotational flow caused by the rotation of the pulsator, according to the drive motor by alternating driving, thereby tangling the laundry. This does not occur and to provide a washing machine and a driving motor control method of the washing machine having a pressure sensor that does not damage the laundry.

1 is a schematic longitudinal sectional view of a washing machine having a pressure sensor according to the present invention;

2 is a flow detection circuit diagram of FIG.

3 is a control flow diagram of a washing machine according to the present invention;

4 is a schematic longitudinal sectional view of a conventional washing machine;

5 is a circuit diagram of a quantity detection unit.

Explanation of symbols for main parts of the drawings

2: main body casing 3: outer tank

5: spin basket 9: pulsator

13: drive motor 23: pressure sensor

24: switching unit

The object is, according to the present invention, having a washing tank for accommodating the laundry to be washed, rotating water flow generating means for generating a forward and reverse rotational flow of the washing water in the washing tank, and a drive motor for the forward and reverse driving of the rotating water flow generating means A washing machine comprising: a flow rate detecting means for detecting a flow rate of a rotational flow of wash water in a washing tank; A control unit for controlling the drive motor based on the detection signal from the flow rate detecting means is achieved by a washing machine.

Here, the flow rate detecting means is preferably composed of a plurality of flow rate detection sensors installed along the vertical direction on the inner wall surface of the washing tank, wherein the flow rate detection sensor can be simply configured as a pressure sensor.

And the control unit stops the drive motor when the detected flow rate value exceeds a predetermined upper limit value; When the detected flow rate value becomes less than or equal to a predetermined lower limit value, if the driving motor is reversely driven, the laundry in the washing tank can be washed effectively.

On the other hand, according to another field of the present invention, the object is a washing tank for accommodating the laundry to be washed, the rotating water flow generating means for generating the normal and reverse rotational flow of the washing water in the washing tank, and the forward and reverse driving of the rotating water flow generating means A drive motor control method for a washing machine having a drive motor for a gas, the method comprising: detecting a flow rate of a rotational flow of washing water in the washing tank; Comparing the detected flow rate value with a predetermined flow rate upper limit value and a lower limit value; In the comparison, the driving motor is stopped when the detected flow rate value is greater than or equal to the upper limit of the flow rate, and the drive motor is reversely driven when the detected flow rate value is less than or equal to the lower limit of the flow rate. It is achieved by the drive motor control method of the washing machine. In this case, the driving of the drive motor is preferably controlled to be alternately forward and backward driving with the idle step in between.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic longitudinal sectional view of a washing machine having a pressure sensor according to the present invention. The washing machine 1 having the pressure sensor of the present configuration has a configuration similar to that described with reference to FIG. 4 of the related art, and merely includes three pressure sensors 23 provided along the up-down direction on the inner wall surface of the outer tub 3. Have more. These pressure sensors 23 are respectively attached to the low water level, the medium water level, and the lower region adjacent to the high water level where the position value is stored in the program of the control unit 21. Thus, as described with reference to FIG. 5, the water supply is completed to the corresponding set water level detected by the quantity detecting unit 25, and the laundry is washed by the driving of the driving motor 13, that is, by the rotation of the pulsator 9. If so, it will detect the flow rate of the rotational flow generated by this.

That is, on the upper surface of the pulsator 9, a plurality of hills are formed so as to protrude upward and extend from the rotation axis toward the outer circumferential surface and are spaced apart from each other by a predetermined angle, and the valleys are formed therebetween. When rotates, the rotational flow is generated by the shear force of the water. Thus, the washing of the laundry proceeds by the rotational water flow, and at this time, the pressure sensor 23 detects the flow rate of the water flow generated by the rotation of the washing water, and transmits it to the controller as an electrical signal.

The detected detection signal of the rotational flow is transmitted to the controller 21 through the path of the water flow sensing circuit diagram shown in FIG. 2. As can be seen from this figure, the water flow sensing circuit diagram includes transistors TRa, TRb, and TRc for selecting any one of input signals from the pressure sensors 23a, 23b, and 23c respectively provided at the upper, middle, and lower portions thereof. A switching unit 24 comprising: a), an AD converter 27 for converting an analog detection signal into digital data by the output of the switching unit 24, data by the output of the AD converter 27, and a memory in the control unit. The control unit 21 compares the reference data stored therein and accordingly controls the forward and reverse driving of the drive motor 13. Reference numeral 29, which is not described, is a selection driver 29 that is driven by the controller 21 to selectively drive any one of the transistors TRa, TRb, and TRc of the switching unit 24.

When rotational water flow occurs in the outer tank, the voltage detected from each of the pressure sensors 23a, 23b, and 23c is provided to the controller 21 through the switching unit 24 and the AD converter 27. At this time, the control unit 21 selectively drives a transistor to receive the detection signal from the pressure sensor corresponding to the set water level among the pressure sensors 23a, 23b, and 23c, and by this selection, the AD converter 27 The reference data is compared with the sampled digital data provided through the. Therefore, the drive of the drive motor 13 is interrupted based on the compared data value, and the forward and reverse drive are alternately performed.

By this configuration, when the washing machine 1 having the pressure sensor is set by the washing method and the washing time by an external operation and the operation of the apparatus is started, the water supply valve is operated as described with reference to FIG. 5. The wash water at the proper level will be supplied. Then, the controller 21 initially drives the drive motor 13 to detect the set water level of the wash water through the quantity detecting unit 25, and supplies the wash water to the set water level accordingly. When the water supply of the wash water is completed, the control unit 21 advances the washing process of the laundry contained in the spin basket.

3 is a control flow diagram of the drive motor 13 in the washing stroke of the washing machine 1 having a compression sensor according to the present invention. When the washing operation is started (S1), the control unit 21 first drives the drive motor 13 in one direction (S2). At this time, the pulsator 9 in the spin basket is rotated, whereby the rotational flow of the washing water is generated, the washing of the laundry proceeds. On the other hand, when a predetermined time has elapsed while driving the drive motor 13, the flow rate of the rotational flow of the wash water is detected through a pressure sensor corresponding to the set water level (S3). At this time, the comparator compares the detected flow rate value with the flow rate value of the predetermined allowable range stored in the memory (S4), and when the detected flow rate value becomes more than the upper limit value, the driving of the drive motor 13 is stopped (S5).

After that, when the predetermined time has elapsed, the comparison unit compares the elapsed washing time with the predetermined washing time set by the user (S6). If the washing time has elapsed, the washing administration ends (S10). Again, the rotational flow of the washing water is sensed through the pressure sensor (S7). The detected flow rate value is also compared with the reference data stored in the memory in the comparison unit (S8). At this time, when the detected value falls below the lower limit flow rate value of the allowable range, the driving motor 13 is driven in the other direction. It is made (S9). Accordingly, the pulsator 9 is driven in the other direction to wash the laundry in the basket.

Thereafter, the control unit 21 repeatedly proceeds to the state of stopping the driving motor 13 for a predetermined time and the state of reversing driving according to the illustrated flowchart, and compares the washing time with the setting time during the process (S6). ), When the washing time elapses, the washing administration ends (S10).

The washing machine 1 having the present pressure sensor according to such a configuration and control method detects and regulates and regulates the flow rate of the rotational flow generated by the rotation of the pulsator 9 to drive the drive motor 13. Compared with the control of the drive motor 13 through the conventional dose detection unit 25, much more accurate control can be achieved. Thus, the on-off time interval of the drive motor 13, which has been delayed or shortened more than necessary, is precisely controlled, thereby preventing damage due to tangling, discoloration and discoloration of laundry.

Meanwhile, in the washing machine 1 having a pressure sensor according to the above-described and illustrated embodiments, the washing machine and the dehydrating stroke have been described with respect to an integrated washing machine in which a single spin basket is provided. In this case, the same purpose can be achieved by attaching the pressure sensor as described above to the inner wall surface of the washing tank. In addition, it is a matter of course that three or more pressure sensors may be installed on the inner wall surface of the outer tub or the washing tub according to the capacity and purpose of the washing machine.

In addition, in the control flow diagram shown in FIG. 3, the control method of the drive motor 13 at the time of washing stroke of the washing machine 1 with this pressure sensor was explained, but also at the time of washing stroke of the washing machine 1, By controlling the drive motor 13 in the same manner as can achieve the same purpose as described above.

As described above, according to the present invention, the washing and rinsing performance of the laundry can be further improved, and at the same time, a control method of the washing machine and the washing machine having a pressure sensor capable of reducing the power consumption can be provided.

Claims (5)

In a washing machine having a washing tank accommodating the laundry to be washed, rotating water flow generating means for generating the forward and reverse rotational flow of the washing water in the washing tank, and a drive motor for the forward and reverse driving of the rotating water flow generating means, Flow rate detecting means for detecting a flow rate of the rotating water flow of the washing water in the washing tank; And a control unit for controlling the driving motor based on the detection signal from the flow rate detecting means. The method of claim 1, The flow rate detecting means is a washing machine, characterized in that the plurality of flow rate detection sensor is installed in the vertical direction on the inner wall surface of the washing tank. The method of claim 2, The flow rate detection sensor is a washing machine, characterized in that the pressure sensor. The control unit, When the detected flow rate value exceeds a predetermined upper limit, stopping the drive motor; And the drive motor is reversely driven when the detected flow rate value becomes equal to or less than a predetermined lower limit value. In the drive motor control method of the washing machine having a washing tank for accommodating the laundry to be washed, the rotating water flow generating means for generating the forward and reverse rotational flow of the washing water in the washing tank, and the drive motor for the forward and reverse driving of the rotating water flow generating means, Detecting a flow rate of the rotating water flow of the washing water in the washing tank; Comparing the detected flow rate value with a predetermined flow rate upper limit value and a lower limit value; In the comparison, the driving motor is stopped when the detected flow rate value is greater than or equal to the upper limit of the flow rate, and the drive motor is reversely driven when the detected flow rate value is less than or equal to the lower limit of the flow rate. Driving motor control method of washing machine.