Spatial harmonics compensation of magnetizing curve model for torque ripple suppression in switched reluctance servo motor

This paper presents a consideration on control strategy for torque ripple suppression in switched reluctance servo motor. It has been disclosed that instantaneous current profiling technique is one of the effective solution to obtain flat torque waveform in SR motor. In the proposed control, the current reference profile are calculated based on torque-current-rotor position (T-i-θ) characteristic model which takes nonlinearity and spatial harmonics into account. 2D-FEA based analytical studies using 12/8 poles 3-phase SR motor reveals the relationship between the maximum order of spatial harmonics included in magnetizing curve model to create T-i-θ characteristic model and the control performance. Finally, this paper presents two approaches to achieve precise torque control under instantaneous current profiling technique in SR motor.