Open-circuit fault diagnosis method for double-winding permanent magnet fault-tolerant motor drive system

Abstract

The invention discloses a method for diagnosing open-circuit faults of a double-winding permanent magnet fault-tolerant motor drive system. In the method, the collected motor phase currents are respectively passed through a low-pass filter, a Clark transformation, a Park vector processor, a normalization processor, The conversion and processing of the average value calculator, absolute value calculator and absolute value averaging processor can obtain the average value of the normalized phase current of the motor and the average value of the absolute value of the normalized phase current, based on these two values The fault diagnosis variable of the system is constructed, so as to realize the real-time detection and location of the open-circuit fault of the double-winding permanent magnet fault-tolerant motor drive system. This method does not need to add an additional current sensor, is simple and easy to implement, and has high reliability. Through the joint use of the average value of the normalized current and the average value of its absolute value, it avoids the problems that are easily generated by conventional diagnostic methods due to load mutations and other reasons. Misdiagnosis, and the diagnosis time is also greatly shortened, which can effectively detect and locate the open circuit fault of the system in real time.

Description

technical field [0001] The invention relates to the field of reliability and fault diagnosis of a motor drive system, in particular to an open-circuit fault diagnosis method of a double-winding permanent magnet fault-tolerant motor drive system. Background technique [0002] With the development of multi-electric, all-electric aircraft and hybrid and pure electric vehicles, the motor drive system has ushered in new development opportunities and challenges. In addition to requiring high power density and high efficiency, it also needs to have high output performance and high reliability. performance, which has become the key to the motor drive system. In the 1990s, the emergence of permanent magnet fault-tolerant motor and its control system improved the safety and reliability of the system, and it has been applied to the aviation field. However, due to electromagnetic interference, insulation aging, poor contact and other reasons, some electrical faults often occur in the m...

AI Technical Summary

Problems solved by technology

In 1998, Professor A.J.Marques Cardoso proposed the current Park vector method for inverter fault diagnosis, but this method requires a very complex pattern recognition algorithm and is not suitable for integration into the drive controller

Subsequently, the average current Park vector method was proposed. This method is carried out in the d-q coordinate system and can quickly judge and determine which IGBT is faulty.

In order to overcome these shortcomings, relevant scholars have proposed the normalized average current method, the normalized average current absolute value method, etc. These methods can improve the robustness of fault diagnosis to a certain extent, but the calculation is too complicated and still There is a potential problem of misjudgment due to sudden changes in load and speed

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