JPH0592098A - Fault diagnostic device for encoder device for driving motor of washing machine - Google Patents

Abstract

PURPOSE:To easily and exactly detect a fault part in an electric conduction state without disassembling an encoder device, in the case the encoder device for a DC brushless motor provided in a washing machine goes down. CONSTITUTION:In a state that an electric conduction to a motor 8 is interrupted, output circuits of sensors 31a-31d provided on a fitting plate of an encoder device are allowed to correspond to input circuits of display lamps 20a-20f, 21a-21f of the washing contents, respectively for every output pattern, and when an output of each sensor 31a-31d is a normal output pattern, the display lamps 20a-20f, 21a-21f are turned on, and when the output is an abnormal output pattern, the display lamps 20a-20f, 21a-21f are not turned on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a DC used in a washing machine.
The present invention relates to a failure diagnosis device for an encoder device of a brushless motor.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show an example of a stirring type fully automatic one-tub type washing machine in which an outer box 1 is provided with a vibration-proof means such as a suspension rod 3 having a vibration-proof spring 2. And suspends the water receiving tank 4.
Inside the water receiving tank 4, a washing / dewatering tank 6 having a dehydration hole 7 on a side wall and a stirring blade 5 were rotatably arranged. Below the water receiving tank 4, a U having a permanent magnet arranged in a rotor
3-phase DC brushless motor 8 phase, V phase, W phase 8
And the rotor shaft is connected to the rotating shaft of the stirring blade 5 and the rotating shaft of the washing / dehydrating tank 6.

A drain hose 11 is connected to a drain pipe 9 opening at the bottom of the water receiving tank 4 via a drain valve 10, and a circulation hose 13 is connected via a circulation pump 12.
The circulation hose 13 is raised in the outer box 1, and the tip is opened above the washing / dehydrating tub 6. Reference numeral 14 in the drawing denotes a lint filter arranged below the open end of the circulation hose 13.
Reference numeral 5 is a power cord, and 16 is a ground wire.

On the upper surface of the outer box 1, a top panel 17 and a lid 41 are provided.
And the operation panel 1 shown in FIG.
8 and the display unit 19 shown in FIG. 11 are provided. The operation panel 18 includes operating switches, such as a washing switch 18a, a rinsing switch 18b, a dehydration switch 18c, which sets a washing time, a number of times of rinsing, and a dehydration time. 18e, an hour / minute switch 18f for setting the start time of reserved operation, a water level setting switch 18g for setting six levels of water levels from "high" to "low", standard washing,
Six course lamps 20a, 20b, 20c, 20d, 20e, 20 including light emitting diode (LED) lamps for displaying the set water level are provided.
Six display lamps 21a, 21b, 21c, 21d, 21e, and 2 are provided corresponding to each water level and are also LED lamps for displaying the selected course.
1f was provided corresponding to each course.

The display unit 19 is provided with a water flow intensity switch 22 for setting the intensity of water flow and dehydration, a dehydration intensity switch 23, a start / pause switch 24, and an off switch 25. The LED display is provided with a numerical display section 26 for displaying the start time, the washing time, the number of rinses, the dehydration time, etc., and a monitor section 27 for displaying the water flow and the dehydration strength as the drive content of the DC brushless motor 8.

Further, the DC brushless motor 8 is
In order to detect the energized position of the motor 8, the motor 8
The rotor position detector (encoder) 28 for detecting the magnet position of the permanent magnet is attached. This encoder 2
As shown in FIGS. 2 to 4, reference numeral 8 denotes a slit 2 that rotates in synchronization with the rotor shaft of the motor 8 and detects the energized position.
And the slit 29 of the reflector 30.
A sensor for detecting is mounted on a mounting plate 32 facing the reflection plate 30. The mounting plate 32 is fixed by a boss stand inside an encoder case 28a mounted on the motor frame 8a.

The slits 29 are formed in an arc shape of 30 degrees corresponding to either the N pole or the S pole of the permanent magnet attached to the rotor, and the slits 29 are 30 degrees apart for detecting the magnetic pole position. There are a total of 6 depending on the width. In addition, a slit 33a and a non-slit 33b are formed on the outer periphery of the reflection plate 30 as a slit for speed detection in the circumferential direction, which are equally divided.
Were alternately formed.

The sensors provided on the mounting plate 32 are arranged on the same circumference having the same radius as the slit 29 at an equal interval of 50 degrees.
The individual sensors 31a, 31b, 31c are arranged, and the slit 33a is provided near the outer periphery of the mounting plate 32.
A sensor 31d for detecting is provided.

As shown in FIG. 5, each of the sensors 31a to 31d is composed of a light emitting diode as a light emitting portion and a phototransistor as a light receiving portion. The energization detection circuits 34a to 34d of the phototransistor are zener diodes. It is a reflective sensor composed of a transistor that turns on and off when driven by a base.

FIG. 6 shows a block diagram of the operation control, which is connected so as to introduce the outputs from the sensors 31a to 31d and the outputs from the switches 18a to 18h to the input port of the control device 35 using a microcomputer or the like. Then, the drive circuits 36 and 39 are connected to the output port of the control device 35, and the drive circuit 36 controls the water supply valve 37, the DC brushless motor 8, and the drain valve 10.
8 to connect the drive circuit 39 to the display lamps 20a to 20
f, 21a to 21f. In the figure, 40 is the control device 3
5 shows a power supply circuit connected to 5.

Next, the operation will be described. When a desired course is selected from six preset courses such as "standard washing" and the laundry is to be washed, the course setting switch 18h is pressed to select the desired course. For example, the course is set by turning on the display lamp 21c corresponding to the "strong wash" course.

On the other hand, when manually setting the washing content, the washing time, the number of rinses, and the dehydration time are set by the washing switch 18a, the rinsing switch 18b, and the dehydration switch 18c, respectively, and the setting contents are displayed on the display unit 26. Is displayed by the LED lamp, and the water level setting switch 18g is pressed to set a desired water level, for example, "medium", and the display lamp 20c corresponding to the "medium" water level is turned on.

In this way, by putting clothes in the washing / dehydrating tub 6, closing the lid 41 and pressing the start / stop switch 24, the data is output from the control device 35 to the water supply valve 37, and automatically reaches the set water level "medium". After being supplied to the DC brushless motor 8, the controller 35 outputs the DC brushless motor 8 to rotate the DC brushless motor 8.

When the motor 8 rotates, the sensor 31a,
Since 31b and 31c are respectively displaced by 50 degrees, the positions of the slits 29 are detected by deviating by 50 degrees, and the sensors 31a and 31c are detected at the timings shown in FIG.
It outputs from the energization detection circuits 34a, 34b, 34c of b, 31c to detect the magnetic pole position of the rotor. This digitized magnetic pole position detection signal is a signal for rotating the motor 8 and is introduced into the control device 35 to control the voltage controller of the motor by the transistor module.

By the way, there is a case where the motor 8 is considered to have failed because the motor 8 does not rotate even though it is energized, or the motor 8 produces an irregular sound or an abnormal sound. The cause of such a failure may be the failure of the motor 8 itself, the control circuit of the motor 8, the encoder 28 of the motor 8, or the activation of a motor protection device that protects the motor 8 from an abnormal current or an abnormal temperature. In order to find a faulty part, conventionally, these control circuits and mechanisms have been disassembled and checked.

[0016]

Since the structure of the control circuit and mechanism is complicated, checking while disassembling not only takes time, but especially when diagnosing an encoder failure, the structure of the reflector and the mounting of the encoder make it difficult to check the structure. Since accuracy is required for combinations such as mutual spacing of plates and positional relationship between slits and sensors, once disassembled, characteristics and performance often change, and failure diagnosis is difficult to perform and misdiagnosis may occur. Many.

The object of the present invention is to eliminate the inconvenience of the conventional example and to diagnose the encoder failure from the outside without disassembling the engoder, and for the drive motor of the washing machine with less risk of misdiagnosis. It is to provide a failure diagnosis device for an encoder device.

[0018]

In order to achieve the above object, the present invention rotates in synchronization with a rotor of a DC brushless motor and has a slit for detecting an energized position, and a reflector of the reflector. In an encoder device for a drive motor of a washing machine, in which a plurality of sensors for detecting slits are arranged on a mounting plate facing the reflection plate, the output circuit of each sensor is output in a state in which the motor is de-energized. Based on the result of the correspondence by the corresponding means, the corresponding means corresponding to the input circuits of the plurality of display lamps for displaying the laundry content for each pattern and the display lamp for displaying the laundry content are also used. The gist of the present invention is to include a display lamp that indicates whether the output is a normal output pattern or an abnormal output pattern by turning on or off each lamp. It is intended.

[0019]

According to the present invention, by manually forcibly rotating the stirring blade, the rotor shaft of the drive motor connected thereto is rotated. As a result, the reflector fixed to the rotor shaft rotates, and outputs are generated from the plurality of sensors arranged on the mounting plate. In this case, by making the output circuit of the sensor correspond to the input circuit of the display lamp that normally displays the water level and course content, if the output pattern from the sensor is normal, for example, the display lamp lights up, If it is not normal, it does not light up, so the defective sensor is identified from the part of the indicator light that did not light up.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a flow chart showing the operation of the failure diagnosis device for an encoder device according to the present invention, and the configurations of the washing machine and the encoder device for the motor, which are the premise of the present invention, have already been described with reference to FIGS. 2 to 6 and 8 to 11. Since it is as described above, detailed description is omitted here.

The DC brushless motor 8 does not rotate,
If the encoder 28 of the motor 8 has a failure due to a malfunction such as the occurrence of an irregular sound, first connect the power plug to the outlet, turn on the power, and then press the push button. Switches 18a-18h, 2
Of 2, 23, 24 and 25, a special combination which is not used in normal washing operation for setting the test mode is simultaneously pressed to set the test mode. In the test mode, the control device 35 configures a corresponding control circuit (means) for making the output circuits of the sensors 31a, 31b and 31c correspond to the input circuits of the display lamps 20a to 20f and 21a to 21f.

When the control circuit is switched to the test mode, first, all the display lamps 20a to 20f and 21a to 21f are turned off (step a), and in this state, the control device 35 is set.
A circuit for acquiring encoder position information is formed in (step B). Next, when the stirring blade 5 is rotated by, for example, 10 degrees to the right by hand, the rotation of the stirring blade 5 is transmitted to the reflecting plate 30 via the rotor shaft of the DC brushless motor 8, and the reflecting plate 30 rotates.

The rotation of the reflector 30 causes the sensors 31a ...
31c detects the position of the slit 29, and as shown in FIG.
When the output, the L output from the sensor 31b, and the L output from the sensor 31c are performed (step C), the display lamp 20a indicating the high water level and the display lamp 21a indicating the standard washing are turned on (step D). Therefore, these display lamps 20a,
21a, the sensor 31 in the energization pattern 1 is seen.
It is determined that a to 31c are normal.

In the same manner, if the stirring blade 5 is rotated by 10 degrees to the right by hand in the same manner, the reflector plate 30 is rotated by this, and the energization pattern is sequentially switched from 2 to 6 and the sensors 31a to 31c. Output patterns from HHL and HH
H, LHH, LLH, LLL, and if there is an output from the sensors 31a to 31c in such an output pattern, the display lamp is a display lamp 2 that indicates a medium or high water level in the energization pattern 2.
0b, an indicator lamp 21b indicating washing of large objects, a medium water level indicator lamp 20c for the energization pattern 3, an indicator lamp 21c for strong washing, and an indicator lamp 2 for low and medium water level in the energization pattern 4.
0d, hand-washing indicator lamp 21d, low-level indicator lamp 20e in the energizing pattern 5, speedy indicator lamp 2
1e, in the energization pattern 6, a low water level display lamp 20f,
The good night silent display lamps 21f are sequentially turned on (steps E to C).

Then, the display lamps 20a to 20f, 21
If all of a to 21f are turned on, it is determined that the encoder 28 has no failure, and twelve lamps 2 which are combined two by two.
If any of 0a to 20f and 21a to 21f is not lit, it is determined from the unlit indicator lamps which defective sensors 31a to 31c are not output in the correct output pattern. .. Further, if the stirring blade 5 is rotated slightly to the left, the display lamps 20a to 20
Contrary to the above, f, 21a to 21f are sequentially turned on from the lower water level display lamp 20f and the good night silent display lamp 21f to the upper one, and the stirring blades 5 are rotated in both left and right directions to form six sets. Display lamps 20a to 20f, 21a
~ 21f is turned on or turned off, see the pattern of turning on and off, the sensor 31a having a failure ~
It is possible to accurately determine which 31c is.

In the above embodiment, each sensor 31a,
If the output patterns from 31b and 31c are normal, the display lamp is turned on, and if it is not normal, it is not turned on. Well, if the display lamp to be used also serves as a display lamp for displaying laundry contents,
The present invention is not limited to the above embodiment.

[0027]

As described above, the failure diagnosing device for the motor encoder device according to the present invention can easily find the failure location from the outside without disassembling the encoder device, and therefore the diagnosis is easy and accurate. Is what you can do.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of a failure diagnosis device for a motor encoder device according to the present invention.

FIG. 2 is a partially cutaway front view of an encoder device in which a failure diagnosis device for a motor encoder device according to the present invention is implemented.

FIG. 3 is a plan view of a reflector of an encoder device in which the failure diagnosis device for a motor encoder device of the present invention is implemented.

FIG. 4 is a perspective view of a mounting plate of an encoder device in which the failure diagnosis device for a motor encoder device of the present invention is implemented.

FIG. 5 is a configuration circuit diagram of a sensor.

FIG. 6 is a control block diagram of the washing machine.

FIG. 7 is a timing diagram of sensor output signals.

FIG. 8 is a perspective view of a washing machine in which the device of the present invention is implemented.

FIG. 9 is a vertical sectional side view of a washing machine in which the device of the present invention is implemented.

FIG. 10 is a plan view of an operation panel of a washing machine in which the device of the present invention is implemented.

FIG. 11 is a plan view of a display unit of a washing machine in which the device of the present invention is implemented.

[Explanation of symbols]

1 ... Outer box 2 ... Anti-vibration spring 3 ... Suspension rod 4 ... Water receiving tank 5 ... Stirring blade 6 ... Washing / dewatering tank 7 ... Dewatering hole 8 ... DC brushless motor 8a ... Motor frame 9 ... Drain pipe 10 ... Drain valve 11 ... Drainage hose 12 ... Circulation pump 13 ... Circulation hose 14 ... Lint filter 15 ... Power cord 16 ... Ground wire 17 ... Top panel 18 ... Operation panel 18a ... Wash switch 18b ... Rinse switch 18c ... Dehydration switch 18d ... Keep switch 18e ... Reserve Switch 18f ... Hour / minute switch 18g ... Water level setting switch 18h ... Course setting switch 19 ... Display unit 20a, 20b, 20c, 20d, 20e, 20f ... Display lamp 21a, 21b, 21c, 21d, 21e, 21f ... Display lamp 22 ... Water flow strength switch 23 ... Dehydration strength switch 24 ... Start / Pause Switch 25 ... Off switch 26 ... Numerical display part 27 ... Monitor part 28 ... Encoder 28a ... Encoder case 29 ... Slit 30 ... Reflector 31a, 31b, 31c, 31d ... Sensor 32 ... Mounting plate 33a ... Slit 33b ... Non-slit 34a, 34b, 34c, 34d ... Energization detection circuit 35 ... Control device 36 ... Drive circuit 37 ... Water supply valve 38 ... Torque motor 39 ... Drive circuit 40 ... Power supply circuit 41 ... Lid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuhiko Yamagami, 1-1 1-1 Yamate, Funabashi, Chiba Pref., Funabashi Manufacturing Co., Ltd. (72) Masami Yorida 1-1, Yamate, Funabashi, Chiba No. 1 Nippon Steel Co., Ltd. Funabashi Works (72) Inventor Tatsuo Inada 1-11-1 Yamate Funabashi City, Chiba Prefecture Japan No. 1 Funabashi Co., Ltd. (72) Inventor Toyozo Kato 1 Yamate Funabashi, Chiba Prefecture No. 1 No. 1 at Nippon Steel Co., Ltd. Funabashi Works

Claims (1)

[Claims] 1. A reflector which rotates in synchronization with a rotor of a DC brushless motor and has a slit for detecting an energized position, and a plurality of sensors for detecting the slit of the reflector are provided on the reflector. In an encoder device for a drive motor of a washing machine arranged on opposing mounting plates, the output circuit of each sensor of a plurality of display lamps for displaying the washing content for each output pattern in a state in which the motor is de-energized Corresponding means corresponding to each input circuit,
It also serves as a display lamp that displays the content of laundry, etc. Based on the result of the response by the corresponding means, it turns on or off each lamp depending on whether the output of each sensor is a normal output pattern or an abnormal output pattern. A failure diagnosis device for a drive motor encoder device of a washing machine, comprising: