A method for diagnosing open-circuit faults of power tubes in six-phase permanent magnet fault-tolerant motor systems

Abstract

A six-phase permanent magnet fault-tolerant motor system power tube open-circuit fault diagnosis method, the current vectors in two orthogonal subspaces are obtained by performing Park vector transformation on the six-phase currents, and the average value of the current vectors in one cycle is calculated. Whether the average value of the current vector modulus exceeds the fault threshold realizes the open circuit fault detection of the power tube, and realizes the location of the faulty power tube according to the positive and negative polarity of the real part and the imaginary part of the current vector. This method does not need to add additional hardware equipment, and the use of zero-sequence orthogonal subspace current vector ensures the strong robustness of the fault diagnosis method to sudden changes in speed and load. This method can realize the power tube open circuit fault diagnosis of the permanent magnet fault tolerant motor system in normal and open circuit / short circuit fault fault tolerant operation at the same time, which significantly improves the fault diagnosis ability of the permanent magnet fault tolerant motor system in the event of primary and secondary open circuit faults .

Description

technical field [0001] The invention belongs to the technical field of motor system fault diagnosis, and in particular relates to a method for diagnosing an open circuit fault of a power tube of a six-phase permanent magnet fault-tolerant motor system for a highly reliable airborne electric actuator. Background technique [0002] With the development of power electronics technology, automatic control technology and new permanent magnet materials, permanent magnet synchronous motors have developed rapidly and have been widely used in aerospace, transportation and other fields. However, the performance of the traditional three-phase permanent magnet synchronous motor will drop sharply after the motor fails, resulting in major accidents. Multi-phase permanent magnet fault-tolerant motors have broad application prospects in high-reliability applications due to their high power density, high efficiency, and high reliability. Although the multi-phase permanent magnet fault-tolera...

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Problems solved by technology

[0005] However, most of the current open-circuit fault diagnosis methods are aimed at the traditional three-phase motor system. Although there are a few related researches on the open-circuit fault diagnosis of the multi-phase permanent magnet fault-tolerant motor system, they are all aimed at the normal operation of the motor and the sinusoidal windings of each phase. Open Circuit Fault Diagnosis under Symmetrical Current Conditions

When the permanent magnet fault-tolerant motor is in fault-tolerant operation with an open-circuit fault or a short-circuit fault, the remaining non-faulty phase windings are asymmetrical and non-sinusoidal. diagnosis

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