Abstract
The major disadvantage of Switched Reluctance Motors (SRMs) is their high torque ripples which limits their suitability to high performance Adjustable Speed Motor Drive (ASMD) applications. Various Instantaneous Torque Control (ITC) schemes have been developed to mitigate the SRM torque ripples. Among them, Torque Sharing Function (TSF) is a popular torque control method. Various conventional offline TSFs and an online TSF based torque control method which reduces the torque ripples and improves the torque-speed performance of conventional TSFs have been developed. However, there are some limitations in the performance improvement of online TSF compared to conventional TSFs. At the same time, the conventional TSF can be optimized to minimize some of its evaluation criteria. Thus, in this paper, conventional TSF is optimized and the TSF optimizing parameters are applied to its corresponding online TSF and a modified current control algorithm is used in the control scheme of the optimized online TSF for improving the torque ripple reduction and torque-speed performance of online TSF. Simulations have been performed on a 280 W, 1500 rpm, three-phase 12/8 SRM drive system for implementation, optimization and performance improvement of the online TSF based torque control scheme.
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