Abstract
The reliability analysis problem of the fault tolerant permanent magnet synchronous motor system in aerospace application is considered in this paper. We firstly propose a novel fault tolerant permanent magnet synchronous motor system, in which the ten-phase fault tolerant permanent magnet synchronous motor with two stators and two rotors mounted on the same shaft, and the single-phase H-bridge inverter are adopted to improve the fault tolerant performance. Then a systematic reliability analysis approach to the fault tolerant motor system is proposed. For the multiple sing phase structure, the Markov process is used to analyze the reliability of the phase fault. For the remaining fault mode, the reliability prediction approach is adopted. Furthermore, the reliability model of the whole motor system is proposed based on the reliability of each fault mode, which is used to calculate the system reliability. This paper provides a guideline for engineers to follow in the fault tolerant motor system design to improve the system reliability.
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