Higher Performance Speed Control System with Flat Torque Control for Switched Reluctance Machines

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One of the most attractive merits of switched reluctance machines (SRMs) is they have no permanent magnet. The SRMs, however, have some demerits, large torque ripples, and nonlinear characteristics, especially. The torque ripples results acoustic noises, irregular rotation, and nonlinear characteristics makes the precise control of SRMs. The demerits prevent for widespread use of SRMs.The study tried to solve the demerits in order to apply SRMs to many fields. It is not enough to reduce the torque ripple with only the torque ripple suppression control. The realization of lower torque ripple of SRMs needs both instantaneous current waveform control and suitable drive circuit for flat torque control. In the study, a novel drive circuit with parallel capacitors was proposed and the lower torque ripple was realized with both the control and the circuit. The flat torque control on the drive circuit realized torque ripple less than 5%. It is confirmed in experiment that the speed control with both the proposed circuit and the flat torque controller has much higher performance than conventional SRM drive control.