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Motor protection method and device

A motor and phase current technology, applied in the field of motors, can solve problems such as malfunctions

Active Publication Date: 2018-10-23
北京德威特电气科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a motor protection method and device to at least solve the technical problem of directly entering the low voltage protection when the motor has a low voltage, resulting in misoperation of the low voltage protection

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a protection method and apparatus for an electric motor. The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay duration, wherein the last period refers to a last detection period based on a detection period at the first moment when the bus voltage disappears; when the recorded time-delay duration achieves predetermined duration, sampling second current information at a second moment when the time-delay duration achieves the predetermined duration; comparing the first current information with the second current information; and if the comparison result indicates that the electric motor has a feedback current at the second moment, starting low-voltage protection of the electric motor. By adoption of the protection method and apparatus, the technical problem of misoperation of the low-voltage protection caused by direct implementation of the low-voltage protection when the electric motor is in a low voltage is solved.

Description

technical field [0001] The invention relates to the field of electric motors, in particular to a method and device for protecting electric motors. Background technique [0002] In the prior art, a large number of electric motors are used in automatic production scenarios, and the safe and reliable operation of electric motors is directly related to automatic production and personal safety. [0003] The motor protection device is to provide comprehensive protection for the motor, and it is a barrier for the safe operation of the motor. Protect the motor. At present, the motor protection device cannot distinguish between short-circuit faults and PT disconnection faults, and low-voltage protection actions will be triggered as long as low voltage occurs. [0004] Aiming at the problem in the prior art that the motor directly enters the low-voltage protection when the low-voltage occurs, resulting in misoperation of the low-voltage protection, no effective solution has been pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02H7/08
Inventor 欧阳强赵长兵李慧勇张鉴侯红民高龙集常红旗王敬仁蒋玉红薛利民郝立鹏刘兴昌常亮李增利康颖张嗣勇李利霞
Owner 北京德威特电气科技股份有限公司
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