JPH01195896A - Dewaterer - Google Patents

Abstract

PURPOSE:To perform the rotational start-up of a dewatering tub smoothly as well as to get rid of any occurrence of abnormal vibration with certainty by installing a motor drive controlling means for control so as to cause an impressed voltage with a motor to become higher successively. CONSTITUTION:In this dewaterer, there is provided with a triode AC switch (TRIAC) (switching element) 17 for phase control over voltage of AC power to be impressed on a dewatering tube driving motor, and also there is provided with a gate drive circuit (element driving means) 21 for performing off-control to this TRIAC 17, and plural types of phase control by each of different control angle patterns and their on-control. After starting of this motor, plural steps of revolving speed are detected by a detector 23, and control modes of the gate drive circuit 21 are properly combined together and executed by a microcomputer (motor drive controlling means) 22 at each speed of the plural steps, whereby an impressed voltage with the motor is made higher successively. With this constitution, such a possibility that rotation of a dewatering tub is suddenly started up is eliminated so that a problem on the occurrence of abnormal vibration is solvable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a dehydrator with improved drive control of a motor for driving a dehydrating tank.

(Prior Art) Conventionally, in a dehydrator such as a two-tub type washing machine, as is well known, a motor for driving the dehydration tank is energized to drive it, and the dehydration tank is rotated at high speed, thereby removing clothes. I try to dehydrate it. When driving the motor for driving the dehydration tank, the motor is driven by applying the rated voltage of the AC power supply.

(Problem to be Solved by the Invention) However, in the conventional system described above, since the rated voltage is applied to the motor from the start of dehydration operation, abnormal vibrations may occur when the rotation of the dehydration tank suddenly starts up. there were. This kind of problem applies to dehydrators in general, but especially when water is stored in the dehydrating tank and clothes (relatively small items) are washed by rotating the dehydrating tank in forward and reverse directions, the dehydrating operation is subsequently performed. Types of machines that perform a so-called dehydration rinse, which dehydrates clothes containing detergent in the dehydration tank while supplying water, and then perform a dehydration operation, not only do abnormal vibrations occur, but also bubbles are generated. There are also problems with this.

The present invention has been made in view of the above circumstances, and its purpose is to eliminate the occurrence of abnormal vibrations in the dehydration tank, and also to prevent the dehydration tank from performing a washing operation or a dehydration rinsing operation before performing a dehydration operation. To provide a dehydrator that can also suppress the generation of bubbles.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a switching element capable of phase-controlling the voltage of an AC power supply applied to a motor for driving a dehydration tank;
An element driving means for performing off control, multiple types of phase control and on control using different control angle patterns for the switching element, a rotational speed detection means for detecting the rotational speed of the motor, and a starting rotational speed of the motor. and a motor drive control means for controlling the voltage applied to the motor to be sequentially increased by appropriately combining and executing the control modes of the element drive means for each stage of rotational speed.

(Function) According to the above means, since the voltage applied to the motor is controlled to be increased sequentially after the motor is started, the rotation of the dehydration tank does not suddenly start up, and abnormal vibrations etc. are prevented. be able to. The applied voltage can be obtained by combining the control modes of the switching elements to a level higher than that obtained by phase control. Therefore, the range of increase in the applied voltage can be set more precisely than when obtaining the applied voltage with the control modes of the switching elements alone. As a result, the spin-up of the dehydration tank becomes extremely smooth.

(Example) An example in which the present invention is applied to a two-tub washing machine will be described below with reference to the drawings.

First, in FIGS. 2 and 3, 1 is an outer box, 2 is an operation box provided at the rear upper part of the outer box 1, and 3 is an operation panel provided on this operation box 2. Inside the outer box 1, a washing tub (not shown) and a dewatering tank 4 are arranged side by side. Reference numeral 5 denotes a dehydration tank disposed within the dehydration receiving tank 4, and 6 a motor for rotationally driving the dehydration tank 5. The dehydration tank 5 has a peripheral wall in which the lower part is non-porous and has dehydration holes 5a formed in the upper part. FIG. 4 shows the operation panel 3 in detail.The operation panel 3 includes a start switch 7, a wash time setting switch 8, and a wash time setting switch 8 for the washing operation performed on the washing tub side. A water flow changeover switch 9 is provided, as well as an indicator lamp 10 for displaying various contents. Further, the operation panel 3 includes a start switch 11 for the dehydration operation performed on the dehydration receiving tank 5 side. Washing time setting switch 12. Dehydration rinse strength setting switch 13
, a dehydration time setting switch 14 is provided, and
A display lamp 15 is provided to display various contents.

Next, FIG. 1 shows the electrical configuration for operation performed on the side of the dehydration tank 5, where 16 is an AC power source, 17 and 18 are triacs which are switching elements, and one triac 17 is connected to the AC power source 16. One power line 16a
The other triac 18 is connected between the power supply line 16a and the reverse rotation terminal of the motor 6. Further, the common terminal of the motor 6 is connected to the other power supply line 16b of the power supply 16.

A gate drive circuit 21 as an element drive means comprising switching transistors 19 and 20 is connected to each gate of the triac 17 and 18, and the base of each transistor 19 and 20 is connected to the output terminal R1 of the microcomputer 22. , R2. The gate drive circuit 21 turns on/off or phase-controls the triacs 17 and 18 by turning on/off the transistors 19 and 20 by control signals from the microcomputer 22. Reference numeral 23 denotes a speed detection device serving as a rotation speed detection means, which includes a current transformer 24 that detects the current flowing through the motor 6, and an A/D converter 2 that converts the current value detected by the current transformer 24 into an A/D converter.
5, and the motor 6 is configured by detecting the current value.
It is designed to detect the rotation speed of. And A/
The D converter 24 is configured to apply a 4-bit digital signal to each input terminal of the microcomputer 22 from 1 to 4. The microcomputer 22 constitutes not only motor drive control means but also stroke control means, display drive means, and the like.

Here, the processes controlled by the microcomputer 22 include a washing operation and a dehydration rinsing operation in addition to the dehydration operation. The washing operation is carried out by appropriately collecting water in the dehydration tank 5 and storing relatively small clothes, and then turning the triacs 17 and 18 on and off alternately to drive the motor 6 in forward and reverse directions.

Further, the dewatering and rinsing operation is performed by intermittently driving the motor 6 in one direction while appropriately supplying water into the dehydrating tank 5.

Now, during dehydration operation, the microcomputer 2
2 controls conduction of one triac 17 to rotate the motor 6 in one direction, but in this case,
By controlling the triac 17 via the gate drive circuit 21 to perform on/off control and multiple types of phase control using different control patterns, the voltage applied to the motor 6 is changed as follows according to its rotation speed. let Currently, there are three control modes for the triac 17, as shown in FIG. 5, in addition to the OFF control mode. FIG. 5(a) shows the first phase control mode with the control angle α1, and FIG. 5(b) shows the second phase control mode with the control angle α2 (α2 x α1).
c) shows the control angle rOJ-on control mode. In this case, as shown in FIG. 6, the applied voltage is vl in the first phase control mode and v2 in the second phase control mode.
, Vd (voltage of AC power supply 16) is obtained in the ON control mode. Further, the micro-fump computer 22 sets three reference values AL, At+ as rotational speed reference values of the motor 6.
A3 (At < A2 < A3 ) is set,
Both are lower than the steady rotation speed Ak.

On the other hand, the microcomputer 22 controls the motor 6 as shown in FIG. 7 in detail during the dewatering operation.

That is, when the dehydration operation is started now, the gate drive circuit 21 first controls the triac 17 in the first phase control mode for t seconds (step S1), and when the t seconds have elapsed, the speed detection device 23 It is determined whether or not the detected rotational speed Ax exceeds the first reference value A1 (step S2), and if it does not, the triac 17 is also placed in the off control mode in t seconds (step S3). Then, after that t seconds have elapsed, the second
Control using the phase control mode is repeated. That is, until the rotational speed Ax exceeds the first reference value A1, the motor 6 is driven by a combination of alternately repeating the first phase control mode and the off control mode every t seconds.

As a result, the first applied voltage becomes an intermediate voltage V10 between "vl" and "0" (see FIG. 6). When the rotational speed Ax exceeds the reference value A1, the triac 17 is controlled in the second phase control mode for t seconds (step S4);
If the rotational speed Ax does not exceed the second reference value A2 after the t seconds have elapsed (determined in step SS), the triac 17 is controlled in the first phase control mode for t seconds (step S6); After that, the control according to the phase control mode of box 2 is repeated every second. In other words, the motor 6 is driven by a combination of alternately repeating the second control mode and the first phase control mode every t seconds until the rotational speed Ax passes the second reference value A2. As a result, the applied voltages at this time are "■2" and "V]
” (see FIG. 6). And again, the rotation speed Ax! If the standard value A2 of 2 is exceeded,
The control angle rOJ is controlled in the ON control mode in seconds including the triac 17 (step Sr), and if the rotational speed Ax does not exceed the third reference value A3 after t seconds have elapsed (determined in step S). ), try, ack 17
control in the second phase control mode in step S9.
), and then repeats the process of executing control in the on control mode again every second. That is, until the rotational speed Ax exceeds the third reference value A3, the motor 6 is driven by a combination of alternately repeating the ON control mode and the second phase control mode every t seconds. As a result, the applied voltage at this time becomes an intermediate voltage Vd2 between rVdJ and "v2" (see FIG. 6). Thereafter, when the rotation speed Ax exceeds the third reference value A3, the triac 17 is driven in the on control mode (step 5IO) and the %' applied voltage is set to Vd.

As described above, according to the present embodiment, since the voltage applied to the motor 6 is controlled to be increased sequentially, dehydration? ! The rotation of No. 5 does not rise suddenly, and the occurrence of abnormal vibrations can be eliminated. In this case, since the applied voltage is controlled in multiple stages (three stages) until the applied voltage reaches the rated voltage Vd, the rotation start-up of the dehydration tank 5 becomes smooth.

By the way, when 2 Pl class is set as the phase control mode of the triac 17 which is a switching element, the set voltage up to the rated voltage Vd is usually the voltage according to the two phase control modes. In the embodiment, since the triac 17 is controlled by a combination of the two phase control modes or by a combination of other control modes (off control mode, on control mode), it is not necessary to apply voltage using the phase control mode alone. Type of voltage (V1
+ Vt ) more applied voltage (Vt., V21, V
d2) can be obtained, and therefore, the range of increase in the applied voltage can be set more finely, the rotation start-up of the dehydration tank 5 can be made smoother, and as a result, the occurrence of abnormal vibrations can be reliably eliminated. In particular, when a dewatering operation that performs such voltage control is performed successively after a washing operation or a dewatering and rinsing operation, there is no sudden rotation start-up of the dehydration tank 5, which can eliminate abnormal vibrations and prevent the generation of bubbles. It can be eliminated.

In the above embodiment, all the voltages applied to the motor 6 are obtained by a combination of control modes, but there is no problem in setting the voltage applied only by the phase control mode at an intermediate stage.

In addition, the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the scope of the invention, such as being applicable to a dehydrating and washing machine.

[Effects of the Invention] As is clear from the above description, the present invention provides a switching element capable of phase-controlling the voltage of an AC power supply applied to a motor for driving a dehydration tank, an off control for this switching element, and multiple types of phase control with different control square hole turns.

An element driving means for performing ON control, a rotational speed detection means for detecting the rotational speed of the motor, and a control mode of the element driving means for each rotational speed of the number of rotational speeds after startup of the motor is executed in appropriate combinations. This device is equipped with a motor drive control means that sequentially increases the voltage applied to the motor, thereby reliably eliminating abnormal vibrations in the dehydration tank. If the dehydration operation is performed after the dehydration and rinsing operations have been performed, the excellent effect of eliminating the generation of bubbles is achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram of the electrical configuration, FIG. 2 is an external perspective view of the washing machine, and FIG. 3 is a front view of the washing machine with main parts cut away. Figure 4 is a front view of the operation panel, Figure 5 is a voltage waveform diagram showing the triac control mode, Figure 6 is a diagram showing the level of applied voltage, and Figure 7 is a flowchart showing the control details. be. In the figure, 4 is a dehydration tank, 5 is a dehydration tank, 6 is a motor, 16 is an AC power supply, 17 is a triac (switching element),
21 is a gate drive circuit (element drive means), 22 is a microcomputer (motor drive control means), and 23 is a speed detection device (rotation speed detection means). Applicant: Toshiba Corporation Toshiba Audio/Video Engineering Corporation 16: AC '11 Source 17: Switching mother and child 21, element drive means 22: Motor drive 1 control means δ-rotation performance limb output means 3rd figure α1 Figure 5 -The point

Claims (1)

[Claims] 1. A switching element capable of phase controlling the voltage of the AC power supply applied to the motor for driving the dehydration tank, OFF control for this switching element, and multiple types of phase control and ON control using different control angle patterns. The control mode of the element driving means is suitably combined and executed at each of a plurality of rotational speeds after the motor is started, and a rotational speed detection means for detecting the rotational speed of the motor. A dehydrator comprising a motor drive control means for controlling the applied voltage to be sequentially increased.