Abstract

Winding is an important part of the electrical machine and plays a key role in reliability. In this paper, the reliability of multiphase winding structure in permanent magnet machines is evaluated based on the Markov model. The mean time to failure is used to compare the reliability of different windings structure. The mean time to failure of multiphase winding is derived in terms of the underlying parameters. The mean time to failure of winding is affected by the number of phases, the winding failure rate, the fault-tolerant mechanism success probability, and the state transition success probability. The influence of the phase number, winding distribution types, multi three-phase structure, and fault-tolerant mechanism success probability on the winding reliability is investigated. The results of reliability analysis lay the foundation for the reliability design of permanent magnet machines.

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