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To develop a reliable permanent-magnet synchronous machine (PMSM) controller for electric vehicle application, detection of permanent-magnet (PM) demagnetization conditions is of significance. This paper explores the use of torque ripple for online PM demagnetization fault diagnosis using continuous wavelet transforms (CWT) and grey system theory (GST). First, a torque-ripple-based rotor flux linkage...
This investigation presents optimal selection of Proportional Integral (PI) controller parameters for the speed control in Permanent Magnet Synchronous Motor (PMSM). Optimal selection of PI controller parameters is necessary to improve performance of PMSM. For this purpose, this investigation uses two evolutionary optimization algorithms namely, Real coded Genetic Algorithm (RGA) and Bio-geography...
In this paper, a novel current tracking strategy for switched reluctance motor (SRM) is proposed, analyzed and verified. The relationship between pulse-width modulation (PWM) duty ratio and current variation in SRM over a cycle is investigated. The results demonstrate that an analytical resolution for calculating the duty ratio to achieve accurate current tracking is not possible because of the nonlinear...
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