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Fault diagnosis device and method for current sensor of 3-phase brushless AC motor

A technology of fault diagnosis device and current sensor, applied in emergency protection circuit device, measuring device, measuring only current, etc., can solve the problem of no sensor and so on

Active Publication Date: 2019-02-05
HYUNDAI MOBIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, if any one of the two current sensors fails, there is no method for detecting the failed sensor.

Method used

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  • Fault diagnosis device and method for current sensor of 3-phase brushless AC motor
  • Fault diagnosis device and method for current sensor of 3-phase brushless AC motor

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Embodiment Construction

[0030] Hereinafter, an embodiment of a fault diagnosis device and method for a current sensor of a 3-phase brushless AC motor according to the present invention will be described in detail with reference to the accompanying drawings.

[0031] In this process, the thickness of the lines shown in the drawings, the size of the constituent elements, etc. may be shown with some exaggeration for clarity and convenience of description. In addition, terms described later are defined in consideration of functions in the present invention, and may be changed according to user's or operator's intention or practice. Therefore, the definitions of these terms should be based on the contents of the entire specification.

[0032] As mentioned above, the operation of the 3-phase brushless AC motor (BLAC MOTOR) requires the measurement of the phase currents of the 3 phases.

[0033] However, although three current sensors are required to measure the phase currents of three phases, a method of ...

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Abstract

The invention relates to a fault diagnosis device and method for a 3-phase brushless AC motor current sensor. The fault diagnosis device includes: a 3-phase brushless AC motor; and a current sensor for measuring the phase current of the 3-phase brushless AC motor. ; A motor driving part that drives the three-phase brushless AC motor; and a control part that drives the three-phase brushless AC motor through the motor driving part and periodically uses the phase current fed back by the current sensor. Calculate the phase current error value. Based on the phase current error value, when the error count value accumulated within a preset certain period of time reaches a preset specific value, it is diagnosed that the current sensor of the corresponding phase has failed.

Description

technical field [0001] The present invention relates to a fault diagnosis device and method for a current sensor of a 3-phase brushless AC motor, and in more detail relates to a method when one of the two current sensors used to measure the phase current of a 3-phase brushless AC motor has a current A fault diagnosis device and method for a 3-phase brushless AC motor current sensor capable of detecting the fault current sensor when a sensor fails. Background technique [0002] Generally speaking, the operation of a 3-phase brushless AC motor (BLAC: BRUSHLESS AC) requires the measurement of the phase currents of the 3 phases. [0003] In order to measure the phase current of 3 phases, 3 current sensors are needed, but in order to reduce the production cost, generally 2 current sensors are used, and the remaining 1 current value passes Kirchhoff's first law (that is, the difference between the 3 phase currents and should be zero Kirchhoff's law) calculation. [0004] Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R31/343H02P21/22G01R35/00G01R19/0092H02P29/0241H02H7/0833H02P29/02H02P6/14H02P6/16
Inventor 柳志勋
Owner HYUNDAI MOBIS CO LTD