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Small-Signal Modeling and Speed Controller Design for Switched Reluctance Motor Drives

In this paper, the ac small signal modeling technique for both pulse-width-modulation (PWM) current and speed controller of SRM drive system is presented. With the small signal modeling for linearization of the SRM, the output transfer function in both PWM current loop and speed loop can be obtained. Both PI current controller and PI speed controller can be also designed with sufficient stability margin by using the small signal model. A criterion for selection of proportional and integral (PI) controller for an SRM is also proposed. In order to simultaneously reduce acoustic noise and torque ripple, a specific current profile was applied to SRM drives with proposed current and speed controller. A hardware prototype of 12/8, three-phase 2kW SRM with TMS320F28335 was constructed and tested. The criteria for selection of PI controller is applied to the SRM Drive system. Torque ripple and acoustic noise in both cases of traditional square current waveform and the modified current profile are compared. The experimental results indicate that the proposed method for derivation of optimized gains can lead to reduced acoustic noise and improve the dynamic performances of the SRM drive system.