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Motor controller IGBT open circuit and motor three-phase open circuit detection method

A motor controller, open circuit detection technology, applied in motor generator testing, single semiconductor device testing, instruments, etc., can solve the problems of delayed work progress, troublesome testing procedures, etc., to achieve detection efficiency, simple and fast detection process, and detection Efficient effect

Inactive Publication Date: 2020-05-15
SUZHOU LVKON TRANSMISSION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the motor has an open circuit fault, it is necessary to stop the motor, disassemble it for detection, and judge whether the motor stator is open circuit by measuring the three-phase resistance externally. The detection procedure is cumbersome and delays the work progress.

Method used

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  • Motor controller IGBT open circuit and motor three-phase open circuit detection method
  • Motor controller IGBT open circuit and motor three-phase open circuit detection method
  • Motor controller IGBT open circuit and motor three-phase open circuit detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a motor controller IGBT open circuit and motor three-phase open circuit detection method, by turning on two of the IGBTs that can form a closed circuit with the motor in a specific order and turning off the remaining IGBTs, the absolute value of the current is recorded, and the six sets Three-phase current data analysis and judgment IGBT open circuit fault and motor three-phase open circuit fault.

[0044] Among them, by turning on two of the IGBTs that can form a closed circuit with the motor in a specific order and turning off the remaining IGBTs, recording the absolute value of the current includes the following steps:

[0045] S1. Turn on UH and VL for a fixed time t1 and turn off the other 4 IGBTs. At this time, UH, motor U phase, motor V phase, and VL form a closed loop, and current is generated in the loop. Read and record A1, A2 The absolute value of the current in A3 is expressed as IU1, IV1, IW1;

[0046] S2. Turn on VH and WL for a fixed ...

Embodiment 2

[0072] In this embodiment, the correctness is automatically detected and verified by the open circuit detection system, and the open circuit detection system includes:

[0073] Data acquisition module: Electrically connect the motor, collect six groups of three-phase currents of the motor during detection;

[0074] Analysis and judgment module: Connect the data acquisition module, analyze according to the collected three-phase current, judge whether the IGBT is open and whether the three phases of the motor are open according to the open judgment conditions, and output the open circuit signal when the judgment result is open;

[0075] Output display module: connect the analysis and judgment module, transmit the open circuit signal to the motor controller and display it through the display device;

[0076] Alarm module: Connect the analysis and judgment module, and alarm when it is judged to be open.

[0077] The invention can identify IGBT open circuit fault and motor three-phase open c...

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Abstract

The invention discloses a motor controller IGBT open circuit and motor three-phase open circuit detection method. Two IGBTs capable of forming a closed loop with a motor are switched on according to aspecific sequence, other IGBTs are switched off, the absolute value of current is recorded, and IGBT open circuit faults and motor three-phase open circuit faults are analyzed and judged through sixsets of three-phase current data. According to the motor controller IGBT open circuit and motor three-phase open circuit detection method, the IGBT open circuit fault and the motor three-phase open circuit fault can be identified through a program without disassembling the motor controller and the motor, and the method is suitable for carrying out initialization diagnosis and maintenance diagnosison the faults, and is convenient and rapid; with one detection, multiple open circuit faults can be detected, and the detection efficiency is high and accurate.

Description

Technical field [0001] The invention relates to the technical field of auto parts processing equipment, in particular to a method for detecting IGBT open circuit of a motor controller and three-phase open circuit of a motor. Background technique [0002] The motor controller is composed of IGBT (UH, UL, VH, VL, WH, WL), control circuit, current sensor (A1, A2, A3) and bus capacitor (C). The current sensor samples the three-phase current, and the control circuit calculates and Control the switching state of the IGBT. The turn-on and turn-off of the IGBT realizes the current control of the three-phase motor U, V and W. If the IGBT is open or the three-phase motor is open, the circular running magnetic field cannot be formed and a malfunction occurs. [0003] When the motor has an open circuit fault, the motor needs to stop working, disassemble and test, and determine whether the motor stator is open by measuring the three-phase resistance externally, which is troublesome and delays t...

Claims

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Application Information

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IPC IPC(8): G01R31/26G01R31/34
CPCG01R31/2601G01R31/343
Inventor 李磊徐楠张雷
Owner SUZHOU LVKON TRANSMISSION TECH CO LTD
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