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Method for diagnosing common disconnection faults of brushless direct current motor inverter

A technology of brush DC motor and diagnostic method, which is applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of low working efficiency of brushless DC motor, and achieve the effect of convenient maintenance and replacement

Inactive Publication Date: 2013-03-27
中山南丰电机制造有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low working efficiency of brushless DC motors with single-phase conduction, most of the commonly used brushless DC motors currently use a six-beat control method with two-phase conduction

Method used

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  • Method for diagnosing common disconnection faults of brushless direct current motor inverter
  • Method for diagnosing common disconnection faults of brushless direct current motor inverter
  • Method for diagnosing common disconnection faults of brushless direct current motor inverter

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Embodiment Construction

[0022] like figure 1 The block diagram of the common open circuit fault diagnosis system of brushless DC motor is shown. The system includes three-phase inverter, brushless DC motor BLDCM, position signal processing unit, current sampling and signal conditioning unit, main control unit and drive isolation circuit. The main control unit receives the current signal from the current sampling and signal conditioning unit, diagnoses the position and type of the faulty tube, and outputs the diagnostic signal on the LED.

[0023] The flow chart of the method for diagnosing common open circuit faults of brushless DC motors in the embodiment of the present invention is as follows figure 2 shown, take the following steps when diagnosing a fault:

[0024] Step 1: Detect the current at this stage, and determine the conduction state matrix at this stage. The six conduction states of the brushless DC motor are represented by a matrix as: , , , , , , the elements in the first ...

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Abstract

The invention provides a method for diagnosing common disconnection faults of a brushless direct current motor inverter. The diagnosing process includes detecting currents of a current stage, and determining a conducting state matrix of the current stage; outputting fault bit signals according to current detection signals of the current stage; calculating a sum matrix Q of a conduction matrix in a period before the current stage, and diagnosing the number and positions of fault tubes by judging the number and positions of 0 elements in the sum matrix Q; and outputting fault types, fault tube positions and fault bits as diagnosis results. According to the method for diagnosing common disconnection faults of the brushless direct current motor inverter, faults can be detected in time and fault positions can be diagnosed when disconnection faults happen to the brushless direct current motor inverter, maintenance and changes for fault switching tubes by technical staff are facilitated, a system can be switched to a fault-tolerant operation mode to operate continuously, and the method has high practical application values in industrials of aviation, aerospace, automobiles and the like with high reliability requirements.

Description

[0001] technical field [0002] The invention relates to a method for diagnosing common open circuit faults of brushless DC motors, belonging to the technical field of motor fault diagnosis and fault tolerance. Background technique [0003] At present, the brushless DC motor uses a semiconductor inverter to replace the mechanical commutator in the general DC motor. There is no commutator, the structure is simple, the operation is reliable, there is no spark, and the electromagnetic noise is low. It is widely used in modern production equipment and instruments. Meters, computer peripherals, high-end home appliances, vehicles, etc. The stator windings of brushless DC motors are mostly made into a three-phase symmetrical star connection, and the back EMF is mostly a square wave, so it can be driven by DC after commutation through the inverter. Because the working efficiency of the brushless DC motor with single-phase conduction is low, most of the brushless DC motors commonly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 史立伟张学义
Owner 中山南丰电机制造有限公司
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