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This paper describes a new position sensorless control for the switched reluctance motor (SRM) by monitoring the rate of change of current with respect to the inductance variation. Two consecutive switch-on times in hysteresis current control are compared to calculate the rate of change of current and hence to estimate the rotor position and speed. The proposed sensorless control algorithm is simple to implement as it does not depend on extensive computation or additional hardware. Simulation and experimental results are presented to demonstrate the feasibility of the proposed sensorless control method.

This paper discusses comparison between a CSRM(conventional SRM) and a TSRM(toroidal SRM). Unlike the CSRM, the TSRM has its windings mounted around the stator york instead of the stator pole. Therefore, the TSRM has many different properties in terms of the structure as well as the waveform of phase currents, phase voltages, back-EMF, flux linkages, etc. This paper presents the theoretical comparison between the TSRM and the CSRM followed by simulation results.