JPH02249596A - Drum type washing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drum-type washing machine that rotates a drum.
In particular, it relates to low-speed startup control.

[Prior art] Conventionally, in drum-type washing machines that rotate a drum, a soft start is performed to prevent sudden startup and to align the drum door and the machine door. A tachometer generator or a pilot generator was used as a rotation sensor (2) to detect the rotation of the induction motor (1) when the induction motor (1) rotated.

However, the rotation sensor (2) configured with a tacho generator or pilot generator cannot be used in the low rotation range (50~
100 rpIB) had the disadvantage that a stable voltage could not be obtained.

Therefore, in order to eliminate this drawback, the applicant has
As shown in FIGS. 6(a) to (C), we devised a rotation sensor (2) consisting of a plurality of slits (3a) or a slit disk (3) with holes and a photosensor (4). ing.

[Problems to be Solved by the Invention] By the way, in the rotation sensor (2) described above, when the output voltage of the photosensor (4) is digitized by the F/V converter (5), the F/V converter (5) is There is a drawback that the transient response characteristic is slightly delayed, and when feedback control is performed, a deviation of 40 degrees tends to occur between the motor rotation and rotation speed detection (see Fig. 5).

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drum-type washing machine that can be soft-started by controlling the oven and thereby solving the above-mentioned problems.

[Means for Solving the Problems] A drum-type washing machine according to the present invention includes an AC power supply that supplies an AC current, and a rotatable drum that stores laundry by the AC power supply supplied from the AC power supply. An induction motor, a rotation sensor composed of a slit disk that detects the rotation speed of the induction motor, and a photosensor, a zero volt sensor that detects zero volts of an AC power source, and a door provided on the fuselage that can be opened and closed freely. It includes a door opening switch that opens, and a control means that inputs an on signal of the door opening switch, an output of the zero volt sensor, and an output of the rotation sensor. When the control means receives the ON signal of the door opening switch and detects zero volts of the AC power source based on the output of the zero volt sensor, the control means gradually reduces the phase angle from the predetermined phase angle based on the output of the rotation sensor. This is used to start the induction motor at low speed.

[Operation] Based on the above configuration, the induction motor is driven by an alternating current supplied from an alternating current power supply, and the rotation sensor detects the rotation speed of the induction motor and outputs it to the control means. When the control means receives the ON signal of the door opening switch and detects zero volts of the AC power supply based on the output of the zero volt sensor, the control means gradually reduces the phase angle from a predetermined phase angle based on the output from the rotation sensor. Embodiment: An embodiment of the present invention will be described below with reference to the drawings.

A drum-type washing machine that washes and dries laundry by rotating a drum that stores laundry has an induction motor (hereinafter referred to as an induction motor) (1) for rotating the drum, as shown in Figure 1. The induction motor (1) is supplied with AC power from an AC power source (6). Then, the AC power supplied from the AC power supply (6) is supplied from the triac (7).
). Further, the induction motor (1) is provided with a rotation sensor (2) that detects the rotation speed, and the rotation sensor (2) is connected to the slit disk (3).
) and a photosensor (4), and is connected to a comparison calculation circuit (8). Furthermore, the comparison calculation circuit (8) includes a zero volt sensor (9) that detects zero volt of the AC power supply, a speed setting circuit (10) that sets the rotation speed of the induction motor (1), and a trigger that generates an ignition pulse. A circuit (11) is connected, and the trigger circuit (11) is connected to the triac (7). In addition, in the figure (
12) is a phase advance capacitor.

Further, as shown in FIG. 2, the drum type washing machine includes a control circuit (13), and the control circuit (13) is provided with a CPU (14) as a control means.

The CPU (14) is connected to the rotation sensor (2), zero volt sensor (9), lid switch (16), and power switch (17) via the input interface (15).
) and a door open switch (18) are connected, and a part of the output manually inputted to the manual interface (15) is sent to the CPU (14) via the A/D converter (19).
)It is connected to the.

In addition, the CPU (14) is connected to an induction motor (1) and a dehydration motor (2) via an output/carrier interface (20).
1), a drain valve (22), a lamp (23), etc. are connected, and a memory (24) and a clock control circuit (
25) is connected.

The clock control circuit (25) includes a timer (26).
is connected.

Next, the operation of this embodiment will be explained along the flowchart of FIG.

The door open switch (18) is turned on, and the door open switch (18) is turned on.
C l” U (14) receiving the C)N signal from 8)
is whether there was an interrupt or not, i.e. the zero volt sensor (
Step 51) determines whether or not the zero volt sensor (9) detects zero volts from the AC power source (6). If the zero volt sensor (9) detects zero volts from the AC power source, it determines whether the start is OK or not, that is, the soft start completion flag a-1. It is determined whether or not (step 52).

Then, if it is determined that the soft start completion flag is not a-1, soft start control is performed (step 53
).

In the soft start control, first, the rotation of the induction motor (1) is started by increasing the phase angle until it reaches a speed lower than the set rotation speed set by the speed setting circuit (10), for example, 1/4 of the set rotation speed. - L, then gradually reduce the phase angle.

The CPU (14) detects with the rotation sensor (2) that the rotation speed has reached 1/4 of the set rotation speed,
The induction motor (1) is rotated by gradually decreasing the phase angle until it reaches a speed greater than 1/4 of the set rotation speed, for example, 1/2 of the set rotation speed.

Then, the CPU (14) detects through the rotation sensor (2) that the rotation speed of the induction motor (1) has become 1/2 of the set rotation speed, and gradually reduces the phase angle until the rotation speed reaches the set rotation speed. to rotate the induction motor (1).

Then, when the rotation speed of the induction motor (1) reaches the set rotation speed, the CPU (14) sets the soft start completion flag a to 1 and shifts to the original control (step 54).
).

On the other hand, in step 52 described above, if it is determined that the start is OK, that is, if it is determined that the soft start completion flag is a-1, the CPU (14) detects the rotation sensor (
2) reads the rotational speed of the induction motor (1) (step 55).

Then, the comparison calculation circuit (8) determines whether or not the read rotation speed is greater than the set rotation speed.Step 5
6) If it is determined that it is larger than the set value, determine a phase angle that will slow down the rotation speed (step 57), and if it is determined that it is smaller than the set value, determine a phase angle that will increase the rotation speed (step 57). 58) (see Figure 4).

Then, the CPU (14) determines whether it is the firing time based on the determined phase angle (step 58), and if it is determined that it is the firing time, the trigger circuit (11) generates a trigger pulse. Thereby, the rotational speed of the induction motor (1) is maintained at the set rotational speed set by the speed setting circuit.

In addition, when the induction motor (1) is stopped and the laundry is taken out from the drum, the position of the drum door is detected as 5 by controlling the soft start, making it easy to align the drum door and the machine door. can do.

Furthermore, by performing soft start control, it is possible to prevent sudden loads from being applied to the induction motor (1).

Note that although a circular slit is shown in this example,
Of course, the present invention is not limited to this, and it is possible to provide a plurality of slits of any shape as required.

[Effects of the Invention] As explained above, the present invention comprises a rotation sensor using a slit disk and a photosensor, receives the ON signal of the door opening switch, and detects the zero voltage of the AC power supply by the output of the zero volt sensor. When detected, the phase angle is gradually reduced from a predetermined phase angle based on the output of the rotation sensor, and the induction 7 is configured to perform a slow start-up, so the transient response characteristics of the F/V converter are slightly delayed. By compensating for this, a soft start can be performed.

[Brief explanation of drawings]

Fig. 1 is a drive circuit diagram of an induction motor according to the present invention, Fig. 2 is a functional block diagram showing a control circuit, Fig. 3 is a flowchart showing the operation of the invention, and Fig. 4 shows the operation of an embodiment. Figures 5 and 5 are diagrams showing the transient response characteristics of the F/V converter, and Figures 6(a) to 6(e) are diagrams showing the rotation sensor according to the present invention. In the figure, (1) is an induction motor, (2) is a rotation sensor, (3) is a slit disk, (3a) is a slit, (4)
(6) is a photo sensor, (6) is an AC power supply, (9) is a zero volt sensor, (14) is a control means, and (18) is a door opening switch. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (2 others) y1] Mouth! 8's arrow diagram Figure 2 Induction 4 Electric transverse first exit path 1, - induction mode 2 2 2nd line t/su 6: AC power supply 7: Try 7 connection 9: +! :ROBOLT SESOGA 12: J+i Co., Ltd. Figure 1 Flowchart Figure 3 Figure l Rejection Figure I g ↑ (b) F/V converter f) - A > 4 feet/old characteristic diagram J r dimension procedure sleeve correction Book (Spontaneous) Supplement II 7/1 Elephant Coffin 1st year. [Detailed explanation of the invention in the specification (closed. Related Patent Applicant Address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Proxy Address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Scope of Claims] An AC power source that supplies alternating current, an induction motor that drives a rotatable drum that stores laundry by the alternating current supplied from the AC power source, and a rotation speed of the induction motor that is detected. a rotation sensor, a zero volt sensor that detects zero volts of the AC power source, a door opening switch that opens a door that is provided on the aircraft body so that it can be opened and closed, an on signal of the door opening switch, an output of the zero volt sensor, and the rotation. A drum-type washing machine comprising: a control means for inputting the output of the sensor; and a photosensor that detects a slit of the rotation sensor, and when the control means receives an ON signal of the door opening switch and detects zero volts of the AC power source based on the output of the zero volt sensor, the control means controls the output of the rotation sensor. Based on this, a drum type washing machine is characterized in that the induction motor is started at a low speed by gradually decreasing the phase angle from a predetermined phase angle.