Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method

An open-circuit fault and three-phase full-bridge technology, which is applied in the direction of measuring electrical variables, instruments, and measuring electricity, can solve the problems of complex fault diagnosis system and low reliability, and achieve optimized hardware conditioning circuits, improved accuracy, and low cost. Effect

Active Publication Date: 2016-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0009] In order to solve the complexity and low reliability of the traditional fault diagnosis system, and to meet the needs of fast, accurate, simple and reliable fault diagnosis and positioning of the brushless DC motor drive system

Method used

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  • Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method
  • Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method
  • Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method

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Embodiment Construction

[0032] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0033] The principle block diagram of the present invention is as figure 2 shown. Among them, the sensor samples the three-phase phase current of the motor in real time, and transmits the current sampling value to the effective value (RMS) conversion module; the function of the RMS module is to calculate the current of the three-phase phase current every 60 electrical angles in each electrical cycle Effective value; the output of the RMS module is converted into high and low levels by the level conversion module, and arranged in an orderly manner into a diagnostic matrix in this state. According to the number i of 0 elements in the matrix, it is judged whether an open circuit fault has occurred, and then with The diagnosis matrix of various faults is compared to locate the faulty power tube and obtain the diagnosis result; finally, the drive system control chip...

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Abstract

The invention provides a phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method. According to the method of the invention, only three extra current sensors are added in hardware to obtain the three-phase current when a brushless DC motor is running; and then the valid current value of each phase current every 60 electric angles in one electric cycle is calculated. The valid current values of the current of three phases in each electric cycle are listed into a diagnosis matrix of this state; according to the number of the 0 elements in the diagnosis matrix, detection is made to check whether there exists an open-circuit fault; and based on the comparison to the open-circuit fault state diagnosis matrix, the power transistor in trouble can be located. Absent from complicated signal processing, the method raises the correct rate of fault diagnosis.

Description

technical field [0001] The invention relates to the technical field of motor drives and converters, in particular to a three-phase full-bridge inverter open-circuit fault diagnosis and location method based on phase current analysis. Background technique [0002] Brushless DC motor (BLDCM) uses electronic commutation to replace the brushes and commutator of traditional brushed motors; and has the advantages of simple structure, excellent speed regulation performance, and high power density, making it widely used in various industrial fields applications, especially in aerospace, weaponry, antenna radar and other high-precision applications with complex electromagnetic environments. [0003] The inverter is the most important part of the brushless DC motor drive system, and the power switch tube in it can convert the DC power into the required AC power. However, due to the possibility of strong electromagnetic interference from the outside, the power switch tube of the inver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/34
CPCG01R31/343G01R31/50
Inventor 马瑞卿周杨刘威李添幸
Owner NORTHWESTERN POLYTECHNICAL UNIV
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