Switched Reluctance Motor Efficiency Increasing by Firing Angle Adjustment for Average Torque Control

This paper presents a simple turn-on and turnoff angles adjustment for average torque control method to increase an efficiency of small-size switched reluctance motor in wide speed and torque range. Increase in efficiency is demonstrated on FEA model of SRM which was verified against measurement on an experimental stand. A simplicity of the control algorithms allows to build a variable speed drive without high-performance microcontroller and FPGA or ASIC. Used SRM is a standard motor available on the market and its efficiency achieved 78.9% for torque 1.5 Nm at speed 1500 rpm.