Reliability Analysis of an Interior Permanent Magnet Synchronous Motor with Consideration of Insulation Aging of Stator Windings

초록

In this paper, an efficient reliability analysis technique for the performance function of an electric motor is taking into account the insulation deterioration of stator windings as well as the uncertainty due to manufacturing tolerance. An insulation resistance formula is first derived to predict accurate insulation degradation over operating temperature and time, and then a precise numerical simulation model for a motor is constructed by utilizing the electromagnetic-thermal analysis tool linked to an equivalent circuit model. Based on the independence between probability design variables and time along with the simulation model, complex time-varying reliability analysis is converted into time-invariant reliability analysis. To examine the validity of the proposed method, the probability distribution and reliability of a performance function for an interior-type permanent magnet synchronous motor due to the manufacturing tolerance included in design variables are compared with and without consideration of insulation deterioration.

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