A Position Sensorless Control for Switched Reluctance Motor

Abstract

This paper describes a position sensorless control for switched reluctance motors (SRMs). The SRM is controlled using the de-fluxing period and the difference between the active phase inductance and the phase inductance at the aligned position. The commutation is carried out so that the phase current becomes zero at the aligned position and the negative torque is not produced. During the regenerative braking, the turn-off timing is determined based on the difference between the phase inductance computed every sampling and the phase inductance at the unaligned position. In the magnetic saturation region, the phase inductance at the current when the effect of the magnetic saturation starts is computed and the excitation is turned off using this inductance. Experimental results are demonstrated and validate the practicality of the proposed method.