Control Performance Comparisons among Three Types of Instantaneous Current Profiling Technique for SR Motor

This paper presents drive performance comparisons among three-types of current profiling techniques minimizing torque ripple for switched reluctance (SR) motor in terms of current ripple, a number of switching of converter, motor efficiency and noise. As SR motors have strong magnetic nonlinearity, hysteresis current control is commonly used for their drives. In this case, however, switching frequency of converter should be set as high as possible in order to keep the resultant current ripple as small as possible. In contrast, the proposed current control employs feed-forward voltage control based on non-linear magnetizing curves model and is executed under conventional subharmonic PWM voltage control with fixed switching frequency. Experimental results using 400W 4-phase 8/6 SR motor demonstrate that the proposed current control can provide better drive performances than other hysteresis current control techniques.