JPS5940479B2 - Motor-directly connected washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an agitating motor-directly connected washing machine in which an agitating blade for agitating and washing laundry is connected to a rotor of a motor for rotating the agitating blade. The purpose is to control the washing time according to the fabric load by counting the number of rotations.

In most of these types of washing machines, the rotation of the stirring blades is reduced by a gear reduction from the motor, and the rotational reciprocating motion is performed by a crank mechanism, and the stirring speed of the stirring blades is determined by the gear reduction ratio. The speed can only be changed slightly by changing the number of poles of the motor, but cannot be changed over a wide range, so the user must first set the washing time according to the amount of laundry.

The present invention focuses on the above-mentioned points, and a specific configuration will be described in detail below using one embodiment.

In the figure, 1 is an outer frame, 2 is an outer tank, and 3 is a washing tub and dewatering tub.

4 is a stirring blade that stirs the laundry in the washing tub; 5 is a stirring blade 4
and a clutch mechanism that switches the rotating shaft of the washing tub 3 between fixed and rotatable; 6 is a motor having an arc-shaped stator 6a and a flat rotor 6b having an axial structure; the rotor shaft is connected to the clutch mechanism 5; is connected to.

Reference numeral 7 denotes a detection plate for detecting the rotor angle, which is connected to the rotor shaft and forms a slit portion.

Sensors 8 and 8' are for detecting the rotation angle, and are a combination of a light emitting diode, a phototransistor, a magnet, a Hall element, and the like.

9 is a drain valve magnet that controls the clutch mechanism 5 and the drain valve.

A vibration isolation mechanism 10 is suspended from the outer frame 1 and connects the outer tank 2.

FIG. 2 is a detailed diagram of the angle detection section of the washing machine.

Next, the control circuit will be explained using the block diagram shown in Fig. 3.
is a flip-flop (
(hereinafter referred to as FF), the output from this is 13a, 1
There are two types of output (3b), and only one output is always generated.

The output 13a of F-F1a enters the counter 14.

The setting circuit 15 is used to arbitrarily set the count value of the counter 14 in advance.
An output is generated until , and is amplified by the amplification circuit 16 to keep the first relay 17 in the ON state.

When the count reaches the set value, the output from the counter 14 disappears, and the first relay 17 is connected to be in the OFF state.

Further, the output 13b of the F-F1a is amplified by an amplifying circuit 16, and is connected to open and close a second relay 18.

Figure 4 shows the output waveform of the angle detection sensor, and the corresponding F-F
The output waveform of l3 and the open/closed state of the contacts of relay 2 (operating state of the motor) are shown.

Fig. 5 also shows the relationship between the speed/torque characteristic A of the motor 6 and the load characteristic of the washing machine (B...when the amount of laundry is large, C...when the amount of laundry is small). There is.

Next, the specific operation will be described. When the reciprocating rotation speed is set to a speed suitable for the type of laundry and the AC power source 11 is turned on, the first relay 17 is activated and the relay contact S1 is closed.

Assuming that the output of F-Fl3 is now being output to the 13a side, the count number of the counter 14 is incremented by 1.

At this time, the second relay 18 is in the OFF state, and the relay contacts S2 are closed to the N and C sides, so the motor 6 rotates in the normal rotation direction (in the direction of the solid arrow in FIG. 2).

When the rotor 6b of the motor 6 rotates, the angle detection detection plate T directly connected to it rotates as well, and the angle detection sensors 8 and 8' rotate through the openings provided at the set angle. pass between.

If the size of the opening is made large enough for the opening to be located at the position of the angle detection sensor 8 for the necessary angle until the motor 6 rotates in reverse, the angle detection sensor The output waveform from F-Fl3 becomes a complete rectangular wave, and this output waveform causes the output of F-Fl3 to be 13 billion, which is amplified by the amplification circuit 16 to operate the second relay 18.

Therefore, the relay contact S2 switches to the N/0 side and the motor rotates in the opposite direction (in the direction of the broken line arrow in FIG. 2).

When the rotation is reversed and rotated by a certain angle, the angle detection sensor 8 is activated again.
An output waveform is output from , the output of F-Fl3 is reversed, and the rotation direction of the motor becomes the forward rotation direction, and at the same time the counter 14
The count number of is incremented by 1.

After repeating this operation and performing reciprocating rotation up to the set number of times, the output from the counter disappears and the first relay 17
is turned off, the relay contact S1 is opened, the motor is stopped, and the washing process is completed.

As can be seen from Fig. 5, which shows the relationship between the speed/torque characteristics and the load characteristics of the washing machine when using the axial gap type eddy current motor of the present invention, the load characteristics when the amount of washing is large is B. The characteristics are as shown in , and the motor (stirring blade) repeats reciprocating motion at a speed that corresponds to the intersection with the motor characteristic curve A.

Further, when the amount of washing is small, the load characteristics are as shown in C, and like the former, the motor (stirring blade) repeats reciprocating motion at the speed C.

Here, since the speed c is b<c, assuming the rotation angle and reciprocating rotation speed of the motor are the same, the washing time will be completed in a shorter time in case C, that is, when the amount of washing is small. do.

Therefore, the washing time can be efficiently controlled depending on the amount of laundry.

As described above, the washing machine of the present invention has the following excellent effects.

■) By setting the washing time in terms of reciprocating rotation speed, the rotation speed changes depending on the amount of laundry due to the relationship between motor characteristics and load characteristics. Depending on the amount of laundry,
Since the washing time can be controlled automatically, the washing time can be set efficiently.

2) Since the angle detection sensor set can detect both rotation detection and reciprocating rotation speed, the circuit configuration is simple.
A highly reliable and inexpensive control circuit can be realized.

[Brief explanation of the drawing]

Fig. 1 is a broken cross-sectional view of a washing machine showing an embodiment of the present invention, Fig. 2 is a detailed perspective view of the angle detection section, Fig. 3 is a block diagram of the control circuit, and Fig. 4 is the output waveform of the control circuit. FIG. 5 is a speed/torque characteristic diagram. 3... Washing tub/dehydration tank, 4... Stirring blade, 5... Clutch mechanism, 6... Motor, 8, 8'...・Sensor for detecting the angle of one rotation.

Claims (1)

[Scope of Claims] 1. The rotating shafts of the washing tub and the stirring blades are coaxially provided, and a rotor is connected to the rotating shaft via a clutch mechanism, and the forward and reverse rotation of the rotor is continuously repeated. A washing machine directly connected to a motor that counts the number of reciprocating rotations of an agitating blade, compares the number of times with a setting circuit, and sets the set number of times as the washing time. 2. The motor-directly connected washing machine according to claim 1, wherein the number of reciprocations and rotations is counted by a set of angle detection sensors that detect the number of rotations of the stirring blade.