Analysis of temperature effects on performance of spoke-type interior permanent magnet machines

In this paper, the influences of temperature variation on the characteristics and performance of spoke-type interior permanent magnet (IPM) machines are analyzed. Key machine performance metrics, such as flux linkages, torque, and inductances variation as functions of the temperature are simulated and discussed. The paper also shows the influences of temperature variation on constant torque curves, voltage limit ellipses, maximum torque per ampere trajectories, and torque-speed curves. The difference of temperature effects between spoke-type IPM machines and other IPM machines are also compared and discussed. The results and trends shown in this paper set a foundation for developing control algorithm which takes the temperature effects into consideration, especially in the applications where operating temperature varies significantly.

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