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High-grade control of switched reluctance machines

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3 Author(s)
Kjaer, P.C. ; Dept. of Electron. & Electr. Eng., Glasgow Univ., UK ; Gribble, J.J. ; Miller, T.J.E.

This paper formulates the objectives associated with high-grade torque control of switched reluctance motors (SRMs). Low torque ripple is a natural outcome of high bandwidth torque control. Smooth torque operation is only uniquely defined together with a secondary objective, such as maximum efficiency, maximum torque-speed capability, maximum power factor, etc., as the SRM does not enjoy the inherent distribution between phases that characterizes AC drives. By introduction of the flux-angle parameter, operation at any point between maximum torque-current ratio and maximum torque-flux ratio is possible. A systematic approach to waveform design is developed and is evaluated using both simulation and experimental testing of a SRM servo-drive system. This approach, which can be regarded as a functional equivalent of AC vector control, starts from machine parameters and gives smooth torque operation with maximized torque-speed range and/or efficiency. Excellent dynamic performance is obtained for speed and position control, together with optimized low torque ripple operation

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Industry Applications, IEEE Transactions on  (Volume:33 ,  Issue: 6 )