Fault diagnosis method for multi-power tube open circuit in fault-tolerant motor system based on park vector method

Abstract

The multi-power tube open-circuit fault diagnosis method for fault-tolerant motor system based on the Park vector method, through the Park vector transformation of the six-phase current of the fault-tolerant motor, real-time calculation of the normalized average value of the three orthogonal space current vectors in one cycle, through comparison The normalized average value of the modulus value of the current vector and the fault threshold are used to detect the open-circuit fault of a single power tube and a double power tube, and the faulty power tube is located according to the positive and negative polarities of the normalized average value of the real part and the imaginary part of the current vector. The method can accurately and quickly realize the open-circuit fault diagnosis of single power tube and double power tube during the normal operation of the permanent magnet fault-tolerant motor system and the fault-tolerant operation of the open circuit / short circuit fault. The strong robustness of mutation and load mutation significantly improves the fault diagnosis ability, reliability and fault-tolerant operation performance of the permanent magnet fault-tolerant motor system, and can effectively meet the high reliability requirements of airborne electric actuators.

Description

technical field [0001] The invention belongs to the technical field of motor system fault diagnosis, and in particular relates to a fault-tolerant motor system multi-power tube open-circuit fault diagnosis method based on the Park vector method for a highly reliable airborne electric actuator. Background technique [0002] In recent years, with the rapid development of power electronics technology, material science and modern control theory, the multi-electric / all-electric aircraft has achieved a major breakthrough in technology, and the aircraft servo actuation system is gradually changing from a multi-energy form actuation system to a single electric power system. Actuation system development. The application of the electric actuation system simplifies the structure of the airborne secondary energy system of the aircraft, reduces the weight of the aircraft, and improves the efficiency, maintainability and reliability of the aircraft. With the advantages of miniaturization...

AI Technical Summary

Problems solved by technology

However, when the permanent magnet fault-tolerant motor is operating in an open-circuit fault or a short-circuit fault, the remaining non-faulty phase windings are asymmetrical and non-sinusoidal currents. If a secondary open-circuit fault occurs in the power switch tube, the traditional method cannot realize fault diagnosis during fault-tolerant operation.

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