Braking control method of frequency conversion motor of washing machine and washing machine

A technology of brake control and frequency conversion motor, which is applied in the control device of washing machine, other washing machines, washing devices, etc., can solve the problems of long braking speed of the motor, hidden dangers, user inconvenience, etc., and achieve the effect of improving the service life.

Active Publication Date: 2019-04-02
QINGDAO HAIER DRUM WASHING MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the washing machine is widely loved by the public for its advantages of small size, multiple functions, water saving and no damage to clothes. However, the dehydration process of the washing machine usually does not have a brake function. The reason is that the braking speed of the motor is relatively long. Considering safety reasons, some washing machines are not allowed to open the door when the motor speed drops below the safe speed. This will cause the door to open for a long time after the program is completed, which will cause inconvenience to the user.
If the washing machine judges that the door lock is abnormally opened during high-speed dehydration, and the motor cannot slow down, it will bring a relatively large safety hazard
[0003] In order to solve the above hidden dangers, the existing technology adopts the method of direct braking, that is, after the washing machine program is completed, the motor speed is directly braked so that the motor speed is quickly reduced to 0 rpm. After dehydration, direct deceleration will cause greater friction between the belt and the motor pulley, resulting in a lot of noise, and will also affect the service life of the belt

Method used

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  • Braking control method of frequency conversion motor of washing machine and washing machine
  • Braking control method of frequency conversion motor of washing machine and washing machine
  • Braking control method of frequency conversion motor of washing machine and washing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] In this embodiment, after the high-speed dehydration of the washing machine, the preset range of the motor speed is first judged, and then the decelerations corresponding to the preset ranges are obtained, and the current motor speed is detected in real time. When the critical value of the rotational speed is reached, switch to the next deceleration and continue to run until the motor rotational speed drops to 0 r / min. The relationship is shown in Table 2. Such as figure 2 As shown, the braking process performed by the washing machine includes:

[0088] Step 201: The dehydration of the washing machine is completed.

[0089] Step 202: Obtain the motor speed.

[0090] Preferably, the motor speed can be obtained by detecting the current motor speed of the washing machine;

[0091] Preferably, the motor speed can be obtained by reading the highest motor speed set by the washing machine program.

[0092] Step 203: Determine the set speed, if it is above 1000 rpm, execu...

Embodiment 2

[0101] In this embodiment, after the high-speed dehydration of the washing machine, first determine the preset range of the motor speed, and then obtain each deceleration corresponding to the preset range, and the preset time corresponding to each deceleration, and the motor speed runs according to the current deceleration After the preset time corresponding to the current deceleration, switch to the next deceleration and continue to run until the motor speed is 0 rpm, wherein, the corresponding relationship between the preset range and the deceleration is shown in Table 1. The corresponding relationship of time is shown in Table 3. Such as image 3 As shown, the braking process performed by the washing machine includes:

[0102] Step 301: The dehydration of the washing machine is completed.

[0103] Step 302: Obtain the motor speed.

[0104] Preferably, the motor speed can be obtained by detecting the current motor speed of the washing machine;

[0105] Preferably, the mo...

Embodiment 3

[0115]In this embodiment, after the high-speed dehydration of the washing machine, the deceleration and the preset time corresponding to the deceleration stored in the storage module are directly acquired, and the motor speed is switched to the next one after running at the current deceleration for the preset time corresponding to the current deceleration. The deceleration continues to run until the motor speed is 0 r / min, and the corresponding relationship between the deceleration and the preset time is shown in Table 3. Such as Figure 4 As shown, the braking process performed by the washing machine includes:

[0116] Step 401: The dehydration of the washing machine is completed.

[0117] Step 402: Control the motor speed to run for a time t1 at a deceleration a1.

[0118] Step 403: Control the motor speed to run for a time t2 at a deceleration a2.

[0119] Step 404: Control the motor speed to run for a time t3 at a deceleration a3.

[0120] Step 405: Control the rotatio...

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PUM

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Abstract

The present invention provides a brake control method for a variable frequency motor of a washing machine, the method comprising: after the washing machine is dehydrated at a high speed, controlling the motor speed to gradually decrease in a manner of increasing deceleration levels, and also providing a washing machine for the brake control method of a variable frequency motor of a washing machine , including a computer controller, a frequency conversion board and a motor. After the washing machine is dehydrated at a high speed, the CPU on the computer controller sends a braking command to the frequency conversion board, and the CPU on the frequency conversion board drives the motor to work after receiving the braking command. The invention can smoothly decelerate the motor of the washing machine after high-speed dehydration, which not only ensures that the motor brakes within a specified time, but also does not generate large noise.

Description

technical field [0001] The invention relates to the field of washing control of washing machines, in particular to a braking control method of a frequency conversion motor of a washing machine and a washing machine. Background technique [0002] At present, the washing machine is widely loved by the public for its advantages of small size, multiple functions, water saving and no damage to clothes. However, the dehydration process of the washing machine usually does not have a brake function. The reason is that the braking speed of the motor is relatively long. Considering safety reasons, some washing machines are not allowed to open the door when the motor speed drops below the safe speed. This will cause the door to open for a long time after the program is completed, which will cause inconvenience to the user. If the washing machine judges that the door lock is abnormally opened during high-speed dehydration, and the motor cannot slow down, it will bring a relatively large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06F37/30D06F33/47
CPCD06F37/304D06F2105/48D06F33/47D06F37/42D06F2103/24Y02B40/00
Inventor 何云峰姜勇强皮晓杰
Owner QINGDAO HAIER DRUM WASHING MACHINE
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