JPS6335271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a washing machine operating device that controls the rotational speed of a washing machine motor by intermittent energization.

Conventionally, as a means of controlling the rotational speed of a washing machine motor, either a motor pole number switching method or an intermittent motor energization method has been adopted, but the former method has the disadvantage that the motor structure becomes complicated. Although the latter method has a very simple structure, it has the disadvantage that intermittent energization causes large rotational ripples in the motor, shortening the life of the motor.

The present invention eliminates the above-mentioned drawbacks and controls the speed of the washing machine motor by an intermittent energization method which is essentially simple in structure, and even in such a case, a rotational speed with almost no ripple can be obtained. ,
Moreover, it is an object of the present invention to provide an operating device for a washing machine that can maintain its operation reliably and well.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. An electronic timer and an arithmetic processing unit will sequentially move the process from washing to final dehydration, as in the case of a timer consisting of a timer motor and a cam switch. Since electronic control circuits designed to do this are well known, the following embodiments will be explained using block diagrams.

FIG. 1 shows a dehydrating and washing machine to which the present invention is applied. In this Figure 1, 1 is the outer box,
2 is a water tank that is vertically movably supported within the outer box 1 via an elastic support member 3; 4 is a rotating tank for washing and dewatering that is installed inside the water tank 2; 5 is a water supply valve; and 6 is a drainage water tank. 7 is a water level switch, and 8 is a washing machine motor, the rotational force of which can be selectively transmitted to the rotating tank 4 and stirring blades 10 via a belt transmission mechanism 8a and a power transmission control mechanism 9. . The electronic control circuit 11 shown in FIG. 2 is for automatically transitioning the process from the detergent washing process to the final dehydration process, and basically, as is well known, an electronic timer 12,
It is composed of an arithmetic processing unit (CPU) 13, a clock control circuit 14, a memory 15, an input buffer control circuit 16, and an output buffer control circuit 17. In the external input section A, 18 is a power switch that supplies power to the entire device, and 19 is an opening/closing lid (not shown).
7 is the water level switch that detects the water level in the water tank 2;
Reference numeral 20 denotes a program selection switch for selecting the contents of the combination of processes, and each of these states is controlled by state conversion elements 21 to 24 such as flip-flop circuits.
are converted into logical values 0 and 1, respectively. In the external output section B, 5 is the water supply valve, 6 is the drain valve, 8 is the washing machine motor, and 25 is an alarm for notifying the end of the washing machine operation. Each part in the external output section B is a switching element 2 such as a bidirectional thyristor.
The energization is controlled by signals 6 to 29. The arithmetic processing unit 13 has state conversion elements 21 to 2 corresponding to the state of each part in the external input section A.
By reading the status of step 4 through the input buffer control circuit 16 and reading the process data from the memory 15, processes such as washing (including water supply), draining, rinsing (including water supply), spin-drying, notification, etc. The output buffer control circuit 17 sends each part of the external output section B necessary for executing the process to the switching element 26.
29 are controlled by applying a trigger signal, and the stroke transition is performed by the electronic timer 12.

Therefore, the washing machine is controlled in the same manner as a so-called cam switch type timer washing machine, which is controlled by a timer consisting of a timer motor and a cam switch.

A portion to which the present invention is applied in a washing machine controlled by the following electronic control circuit 11 will be described in detail. That is, the external input section A has a motor control setting section 30, which is used to variously set the startup characteristics or steady rotation speed of the washing machine motor 8 according to the amount of laundry, the quality of the fabric, the amount of dehydrated material, etc. The motor control setting information S1 is supplied to the arithmetic processing unit 13 via the conversion circuit 31 and input buffer control circuit 16. In FIG. 3, particularly the motor speed control section 32 in the arithmetic processing unit 13 is shown as an example. That is, in FIG. 3, 33 is an AC power supply applied to the washing machine motor 8, and 34 is a rectangular wave forming circuit, which generates, for example, 50 cycles of AC voltage V1 shown in FIG. By receiving the rectified positive half-wave voltage as shown in Fig. 4B, it outputs a pulse P1 (see Fig. 4C) having a rise and a fall in synchronization with the approximately zero value of the half-wave voltage. It's becoming like that. This pulse P1 is shown in FIG. 5 in a reduced scale with respect to FIG.
1 is supplied to a trigger pulse generation circuit 36, from which a trigger pulse P2 shown in FIG. 5 is output. This trigger pulse P2 is synchronized with the substantially zero value of the AC voltage V1 shown in FIG. 4A. 37 is a frequency dividing circuit provided as a part of means for dividing the frequency (in the present invention, the value for one second) of the AC voltage V1, and is composed of n flip-flop circuits FF1 to FFn. By receiving the pulse P1 as an input, the flip-flop circuits FF1 to FFn of each stage produce frequency-divided signals F1 to Fn, each having a half frequency of that of the previous stage.
are output, and these are supplied to the trigger control circuit 38 together with the trigger pulse P2. This trigger control circuit 38 contains stroke data S2 read from the memory 15 and motor energization characteristic information S preset in the memory 15.
3 is now being supplied. The trigger control circuit 38 then provides motor energization characteristic information S3.
When the content is the first state, the frequency division signal F
The trigger pulse P2 is set as the fifth pulse based on Fn.
As shown in FIG. 2, it is repeated to allow the supply to the switching element 28 for the Ta1 period and stop the supply for the Tb1 period. Therefore, as shown in FIG. 5E, the AC voltage V1 is supplied to the washing machine motor 8 as a unit cycle, which is two cycles obtained by dividing the frequency of the AC voltage V1 of the power supply into 1/25, and the next period is Tb1. During one cycle period, the operation of cutting off the power is repeated with one cycle as a unit cycle. Further, when the motor energization characteristic information S3 is in the second state, the trigger pulse P2 is shown in FIG.
Allows supply to switching element 28 during Ta2 period
Repeat to stop its supply for Tb2 period. Therefore, in the Ta2 and Tb2 periods, the AC voltage V1 is reduced to 1/50.
The washing machine motor 8 is repeatedly energized for one cycle and then cut off for the next cycle, as shown in FIG. 5D. And motor energization characteristic information S
3 indicates the third state, the switching element 28 is triggered near each zero value of the AC voltage V1, and the washing machine motor 8 is continuously energized.
The states of the motor energization characteristic information S3 as described above are combined as shown as an example in FIG. In the rinsing process, the strength of the water flow is automatically determined according to the amount of laundry to be washed and the quality of the fabric, and in the dehydration process, the rotation speed of the rotating tub 4 is automatically determined according to the amount of laundry to be dehydrated and the quality of the fabric. It is meant to be. Below, to explain FIG. 6, N is the rotation speed of the washing machine motor 8, n1 and n2 are the regular rotation speed,
t is time. As shown in FIG. 6B, when the washing machine motor 8 is continuously energized from the start of startup until a predetermined time t ₀ and then is energized intermittently by repeating two cycles of energization and one cycle of de-energization, as shown in curve 40 in FIG. 6A. The speed characteristics are shown below. In addition, in Fig. 6, the curve 42
is a speed characteristic curve when electricity is continuously applied from the start of startup to the final time. As can be understood from Fig. 6, by intermittent energization of the washing machine motor, its start-up characteristics and steady rotation speed can be controlled, thereby ensuring the start-up characteristics of the washing machine motor. Moreover, it is possible to control the strength of the water flow during the washing and rinsing processes while maintaining a good condition, and it is also possible to perform weak dehydration during the dehydration process.

It goes without saying that the present invention may be applied to a so-called two-tub washing machine.

According to the present invention, the following effects can be obtained as understood from the above embodiments. That is, in order to control the water flow during washing and rinsing and the rotational speed during spin-drying, a means for controlling the rotational speed of the washing machine motor is continuously energized for a predetermined time after startup, and then the motor is intermittently energized by a switching element. The structure is extremely simple compared to the case where the number of poles is switched, and the power-off period when the washing machine motor is energized intermittently can be set to a length of seconds using a timer cam switch as in the past. Since the frequency of the AC power supply is divided into multiple unit cycle periods instead of being carried out in a single cycle, the periodic power outage period can be made extremely short, for example, one to three cycles as one unit. Therefore, even with intermittent energization control, there is almost no ripple in the rotational speed of the washing machine motor, and it is possible to prevent shortening of the life of the washing machine motor due to large torque fluctuations, and to prevent abnormalities in the rotating tub due to torque fluctuations. To obtain excellent effects such as being able to prevent vibrations, etc., and furthermore, since the motor is continuously energized for a predetermined period of time after starting the motor, the motor can be started properly and reliably, and malfunctions such as locking can be prevented. It is something that can be done.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the present invention.
The figure is a vertical cross-sectional front view of the dehydrating and washing machine, Figure 2 is a block diagram of the control circuit, Figure 3 is a block diagram for explaining the motor speed control section, and Figures 4 and 5 are for explaining the operation. FIG. 6 is a speed characteristic curve diagram shown together with the energization waveform. In the figure, 2 is a water tank, 4 is a rotating tank, 8 is a washing machine motor, 10 is a stirring blade, 11 is an electronic control circuit, 12
13 is an electronic timer, 13 is an arithmetic processing unit, 28 is a switching element, 30 is a motor control setting unit, 32
33 is an AC power source, 37 is a frequency dividing circuit that plays a part of the frequency division function, and 38 is a trigger control circuit.

Claims (1)

[Claims] 1. A switching element that opens and closes an energization path of a washing machine motor and a circuit that opens and closes this switching element are provided, and the switching element is connected to the washing machine motor at predetermined intervals during a unit cycle period in which the frequency of the AC power supply applied to the washing machine motor is divided into a plurality of frequencies. The washing machine motor is controlled to be energized or disconnected by opening the washing machine motor, and the washing machine motor is continuously energized for a predetermined period of time after starting the washing machine motor regardless of the predetermined cycle, and after the predetermined time has elapsed, the power is turned on or off at the predetermined cycle. What is claimed is: 1. A washing machine operating device comprising: an arithmetic processing unit that controls opening and closing of a switching element.