Inductance Model-based Sensorless SRM Drive with Torque Ripple Minimization

An inductance model-based sensorless control strategy with torque ripple and acoustic noise minimization for switched reluctance machines is proposed. In order to simultaneously reduce the torque ripple and acoustic noise, a specific-shaped current waveform that is needed and obtained from a torque-sharing function (TSF) is used in this paper. With the inductance model-based sensorless control strategy and the specific-shaped current modulation, the any rotor position within the entire electrical angle can be calculated by the bisection algorithm so that a specific current profiling can be obtained and therefore torque ripple and acoustic noise minimization can be achieved. The traditional trapezoid-shaped current modulation is compared with the specific current profiling in term of torque ripple. A 2 kW 12/8 SRM sensorless drive is modelled using the PSIM software. The simulated results indicate that the new sensorless control strategy is effective in reducing torque ripple. A hardware prototype of 2 kW converter with TMS320F28335 is also constructed and tested. The experimental results indicate that the new sensorless control strategy is effective in rotor position estimation.