JPH0252699A - Controller for dewatering machine - Google Patents

Abstract

PURPOSE:To eliminate the misjudge of a load quantity given to a dewatering motor even at the time of opening and closing a dewatering cover in the middle of dewatering and to execute the effective dewatering by resetting or stopping a timer means when a cover open/close detecting means detects an open. CONSTITUTION:A control means 5 judges a dewatering load by a time until a capacitor voltage goes to a prescribed voltage with the output of a timer means 4 to start a timing from the activation of a capacitor type induction motor (dewatering motor) 1 and the output of a capacitor voltage detecting means 2 to detect the voltage of the capacitor for a drive of the dewatering motor 1, and the means 5 decides a dewatering time. The timer means 4 is reset when the open of the cover of a dewatering tank is detected by a cover open/close detecting means 3. In such a way, even at the time of opening and closing the dewatering cover in the course of the dewatering, the misjudge of the load quantity given to the dewatering motor can be eliminated, and when the dewatering time is set according to the judged load quantity, the effective dewatering can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a dewatering machine that rotates and dewaters a dewatering kettle using a condenser type induction motor.

2. Description of the Related Art One method for inexpensively detecting the amount of laundry to be dehydrated is to detect the voltage of a driving capacitor of a capacitor-type induction motor (hereinafter referred to as a dehydrating motor).

This method determines the amount of time it takes for the capacitor voltage to rise above a certain value from the initial drive value, depending on the load. If this time is short, the load is determined to be small, and if this time is long, the load is determined to be large. 7. Problems to be Solved by the Invention The dehydration motor is equipped with a safety switch that turns the AC voltage ON and OFF in series, and the operation of the switch is controlled by the lid of the dehydration tank. It is linked to opening and closing, and when the lid is opened, the safety switch is turned OFF and the dehydration motor is de-energized. Here, when the amount of laundry is detected using the conventional capacitor voltage detection method, when the user opens the lid during spin-drying, the safety switch is activated and the capacitor voltage suddenly drops to near Ov.

Therefore, as shown in FIG. 4, the characteristic a' would normally be exhibited instead of the characteristic a. In that case, the time t1 until the capacitor voltage reaches the predetermined value V will be significantly extended. As a result, there was a problem in that the amount of load was determined to be greater than the actual amount.

The present invention takes such considerations into consideration, and aims to prevent erroneous determination of the amount of load applied to the dehydration motor even when the power source is turned off during dehydration using the lid of the dehydration tank.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a dehydration capacitor-type induction motor, a capacitor voltage detection means for detecting the voltage across the driving capacitor, and an open/closed state of a dehydration tank lid. A lid opening/closing detection means detects the opening/closing of the dewatering motor, a timer means which uses the output of the lid opening/closing detection means to detect 7) or stops, and a timer means which measures the time until the capacitor voltage detection means reaches a predetermined value. The apparatus is configured to include a control means for determining the load amount and controlling the dewatering time.

Effect: With this configuration, when the lid opening/closing detection means detects the opening of the lid, the timer means is reset, so that determination of the amount of load applied to the dehydration motor is stopped. After this, when the lid opening/closing detection means detects that the lid is closed, measurement by the timer means is started, and the determination of the load amount is newly performed from that point onwards.

Example Embodiments of the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 1, reference numeral 1 denotes a capacitor-type induction motor (dehydration motor) that rotationally drives a dehydration pot in a dehydration tank, and the voltage of a driving capacitor of this dehydration motor 1 is detected by a capacitor voltage detection means 2. Reference numeral 3 denotes a lid opening/closing detection means for detecting opening/closing of the lid of the dehydration tank, which is connected to the timer means 4. This timer means 4 is reset when the lid is opened. Further, the control means 6 inputs the output of the timer means 4, which starts timing from the start of the dehydration motor 1, and the output of the capacitor voltage detection means 2, and determines the dehydration load based on the time it takes for the capacitor voltage to reach a predetermined voltage. , determine the dehydration time.

Next, the specific circuit configuration will be explained with reference to FIG.

In FIG. 2, reference numeral 9 denotes a bidirectional cylinder, which is used to drive the dewatering motor 1. A resistor 10 connected to the gate of this bidirectional thyristor 9 limits the gate current. Reference numeral 2 denotes a capacitor voltage detection means, which detects the voltage across the drive capacitor 8 of the dehydration motor 1. Reference numeral 6 designates a microcomputer, which includes an input section 6a for inputting a signal from the capacitor voltage detection means 2, an output section 6b for outputting an output signal to the bidirectional thyristor 9, a storage section 6d for storing the capacitor voltage value, and an input section 82.
It has an arithmetic control section ec that controls the L, output section 6b, and storage section 8d, respectively, and performs data comparison operations.

Note that 11 is a commercial AC power source. The microcomputer θ has a control means 5 and a timer means 4 shown in FIG.
This constitutes the lid opening/closing detection means 3.

Next, the operation of the present invention will be explained with reference to FIG.

First, the microcomputer 6 drives the dehydration motor in step 21, reads the voltage value Vc across the capacitor at the initial stage of startup in step 22, and stores this data as the initial voltage value vO.

Next, in step 23, a timer is counted, and in step 24, the capacitor voltage Vc is set to the above (V).

+30) Determine whether it has increased to 7 or more, and (VQ+
30) If it is smaller than M, the process proceeds to step 26, and the opening of the dehydration lid is detected. Here, if the value of vc is smaller than 4o, the process returns to step 23 and the timer continues counting. If the vcO value is 4Om or more, it is assumed that the dehydration lid is open, and the process proceeds to step 26, where the timer is reset. Furthermore, in step 27, blockage of the dehydration lid is detected.

In other words, while the vcO value is smaller than 607, the dehydration lid is considered open and the timer is reset.
When the value of Vc becomes 60V or more, the process returns to step 23 and the timer starts counting anew. Returning to step 24, if the VcO value becomes (VO+30v) or more, the process proceeds to step 28. Here, based on the timer value T, the microcomputer 6 determines the amount of load to be applied to the dewatering motor. First, in step 28, it is determined whether the T is 20 seconds or more, and T<';! In the case of O seconds, it is determined in step 29 that the load amount is small, and the dehydration time is set to 1 minute. If T is 20 seconds, proceed to step 30 and T is 3 seconds.
It is determined whether the time is 0 seconds or more. If T is 30 seconds, the load is determined to be medium in step 31 and the dehydration time is set to 3 minutes; if it is 7230 seconds, the load is determined to be large in step 32 and the dehydration time is set to 5 minutes. Set.

According to the above embodiment, if the lid is opened during dehydration, the timer is reset, and if the lid is closed afterwards, the timer starts counting anew, so the load on the dehydration motor is Since the amount can be determined accurately and the dehydration time is set according to the determined load amount,
Dehydration can be performed efficiently.

Note that the opening/closing detection means for the dehydration tank lid can be performed using a method other than the present invention, but the present invention detects ON-OFF states of the dehydration tank lid only by data processing of capacitor voltage values, and the lid can be installed at low cost. It is possible to detect whether the door is open or closed.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, when the lid opening/closing detection means detects opening, the dehydration lid is opened and closed during dehydration in order to reset or stop the timer means. It is also possible to eliminate erroneous determination of the amount of load applied to the dehydration motor, and if the dehydration time is set according to the determined load amount, the effect of efficient dehydration can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a control device for a dehydrator showing an embodiment of the present invention, Fig. 2 is a specific circuit diagram of the same, Fig. 3 is a flowchart of the same main part, and Fig. 4 is a diagram showing capacitor voltage Vc and time t.
It is a graph showing the relationship between 1... Capacitor type induction motor, 2...
... Capacitor voltage detection means, 3 ... Lid opening/closing detection means, 4 ... Timer means, 6 ...
control means. Name of agent: Patent attorney Shigetaka Awano and 1 other person 1st
Figure 2

Claims (1)

[Claims] A capacitor-type induction motor that drives dehydration, a capacitor voltage detection means that detects the voltage across the drive capacitor, a lid opening/closing detection means that detects opening and closing of the lid of the dehydration tank, and a capacitor voltage that is set at a predetermined level from the time of startup. The lid opening/closing detection means comprises a timer means for measuring the time until the water rises above a value, and a control means for determining the amount of load applied to the condenser type induction motor from the data of the timer means and controlling the dehydration time. A control device for a dehydrator, characterized in that the timer means is reset or stopped when the opening of the lid is detected.