A sense winding system and dynamic current profiling to reduce torque ripple of SRM

Abstract

Summary In spite of simple, rugged, and low‐cost construction of switched reluctance motor (SRM) motor, it has not gained wide spread usage in many applications because of torque ripple and audible noise. The nonlinear magnetic characteristics of SRM are the major cause for torque ripple. The torque ripple can be minimized by controlling the current according to the rate of change of inductance. A low‐cost sense winding system is proposed, which measures instantaneous inductance of the motor. The current references are computed from the measured instantaneous inductance to reduce the torque ripple. The proposed sense winding concept can also measure the rotor speed and rotor angle, which will eliminate the need of external position sensors such as encoder. The dynamic nature of inductance measurements will overcome the drawbacks of offline inductance measurement, such as effect of temperature, asymmetry in motor construction, and the need for tests to capture offline inductance. The signal processing of the sense voltages is implemented on a system on chip (SoC) field‐programmable gate array (FPGA) along with the speed and current control loops. The proposed sense winding system is validated with the help of the Ansys Maxwell 2D as well as experimental prototype.

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