Research Article Open Access

Direct Instantaneous Torque Control of Switched Reluctance Motors

Abstract

The main disadvantage of switched reluctance motors (SRM) is the higher torque ripple compared to conventional machines, which result in acoustic noise and vibration. The torque pulsations in an SRM are due to the highly non-linear and discrete nature of torque production mechanism. The paper presents an investigation on the direct instantaneous torque control (DITC) of a 1-hp four-phase 8/6 switched reluctance motor (SRM). In the proposed technique, direct instantaneous torque control for a four-phase SRM drive the torque sharing function can be used to generate the reference values of phase torques from the required torque. The switching signals are directly generated from the comparison between the reference phase torques and the estimated phase torques using hysteresis controller. The hysteresis torque controller generates gating signals to the power converter. The instantaneous phase torques can be calculated from the phase currents and rotor position. Therefore, a high-resolution encoder can be avoided. Results obtained from computer simulations of the developed MATLAB / Simulink model experiments have confirmed the validity and acceptable performance of the proposed scheme.

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