Temperature effects compensation control algorithm of IPM machines utilizing current pulse injection and online multi-parameter estimation for traction applications

For automotive applications, accurate torque production capability and high efficiency of the traction motor is very important. However, the performance of widely used interior permanent magnet (IPM) machine is influenced by temperature variation. In this paper, a control algorithm is proposed to compensate the performance variations in IPM machines due to temperature change utilizing current pulse injection and online multi-parameter estimation. Based on the special driving cycle characteristics of vehicles, current pulse injection is done during idle conditions and has minimum influence on the normal operation of vehicles. Results show that the proposed compensation control method can successfully maintain torque production accuracy and maximum torque per ampere (MTPA) operation during temperature variation.

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