Six-phase permanent magnet fault-tolerant motor system power tube open-circuit fault diagnosis method

Abstract

The invention discloses a six-phase permanent magnet fault-tolerant motor system power tube open-circuit fault diagnosis method. The method comprises steps of conducting park vector transformation onthe six-phase current to obtain current vectors in two orthogonal subspaces; and calculating a current vector average value in a period, realizing open-circuit fault detection of the power tube by judging whether the current vector module value average value exceeds a fault threshold or not, and realizing positioning of the fault power tube according to positive and negative polarities of the current vector real part average value and the imaginary part average value. According to the method, additional hardware equipment does not need to be added, the utilization of the zero-sequence orthogonal subspace current vector ensures strong robustness of the fault diagnosis method to the rotating speed and the load sudden change. The fault location only needs to effectively simplify the operationaccording to the positive and negative polarities of the location variable, the method can simultaneously realize the power tube open-circuit fault diagnosis of the permanent magnet fault-tolerant motor system in normal and open-circuit / short-circuit fault-tolerant operation, and the fault diagnosis capability of the permanent magnet fault-tolerant motor system in the case of primary and secondary open-circuit faults is significantly improved.

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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