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A motor stall protection method and device

A motor stalling and protection device technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as failure to protect stalling abnormalities in time, lack of stalling protection, temperature protection hysteresis, etc., to achieve temperature protection mode Lag, simple structure, fast response effect

Active Publication Date: 2018-09-07
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the second case, the motor stall will lead to high current and temperature rise. Although the over-current protection and temperature protection can also play a certain role in this, the over-current protection is originally for short circuit, but the motor is blocked. It will be accompanied by the increase of the current, so it has an attached protection function. Moreover, although the motor stall current will increase, the magnitude of the current change is still quite different. Often people like to increase the over-current protection value. In this process, the function of the blocking protection is often filtered out, so the overcurrent protection is not a real blocking protection; in addition, the temperature protection has hysteresis, and often cannot protect the abnormal blocking in time
[0004] In short, the current electrical equipment basically does not have a special stall protection function. When the equipment is in operation, there will be mechanical jams and hidden dangers of motor damage.

Method used

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  • A motor stall protection method and device
  • A motor stall protection method and device
  • A motor stall protection method and device

Examples

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Embodiment

[0034] This embodiment provides a motor stall protection device, such as figure 1 As shown, it includes a control module, a vibration sensor and a storage module. Both the vibration module and the storage module are connected to the control module in communication; the vibration sensor is used to collect the real-time vibration waveform of the motor; the storage module is used to store the pre-collected Reference vibration waveform: the control module is used to compare the real-time vibration waveform of the motor with the reference vibration waveform under normal operation of the motor, and send a protection signal when the difference between the two exceeds a preset value.

[0035] As a more specific implementation, the vibration sensors are arranged in the bearing chambers at the front and rear ends of the motor.

[0036] As a further embodiment, the control module communicates with the power switch of the motor; in addition, the device can also include an alarm whistle an...

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Abstract

The invention discloses a motor stalling protection method and device, belonging to the technical field of motor control, and aiming at solving the problems of the existing electric equipment that the equipment does not have a specific stalling protection function, and during operation, hidden dangers of machine failure and motor damage exist. According to the motor stalling protection method disclosed by the invention, a storage module is used for storing a pre-collected standard vibration waveform in normal work of the motor, a vibration sensor is used for collecting a real-time vibration waveform of the motor, a control module is used for comparing the real-time vibration waveform of the motor with the standard vibration waveform in normal work of the motor, and if the difference value between the two excesses a preset value, the control module sends out a protection signal. The response speed is high, the control is accurate, the motor can be timely protected, and failure, vibration, abrasion abnormity and the like caused by mechanical faults of the motor can be prevented. The invention further provides a motor stalling protection device.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a motor stall protection method and a motor stall protection device. Background technique [0002] With the continuous development of motor insulation materials, the insulation aging life is relatively long now, so the motor has high reliability under normal operating conditions. However, during the use of the motor, there will still be a burn-in situation. In conclusion, it is mainly due to the following two reasons: the first is electrical reasons, including abnormal voltage, phase loss, overload, etc.; the second is mechanical reasons, mainly It is a stall caused by various mechanical jams. [0003] Then, for the first case, the current electrical design has overcurrent protection, lack of reverse phase protection, overheating protection and so on. For the second case, the motor stall will lead to high current and temperature rise. Although the over-current protection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085
Inventor 李国耀丁亚斌赖元华樊钊
Owner GREE ELECTRIC APPLIANCES INC
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