A Sensorless Heavy Load Starting Control Method For SRMs With Residual Inductance Calculation and Polynomial Fitting

In this letter, we propose a novel position sensorless control method for switched reluctance machines (SRMs). This method is based on a residual inductance calculation and a polynomial fitting solution. Due to its ability to implement position sensorless heavy load starting control, the proposed method eliminates the need for filters and additional hardware; Not only numerical information about the inductance of each phase of the motor is used but also information about the shape of the inductance curve. The use of multiple information can improve robustness and overcome errors due to the integral term at low speed, so it enables fast motor starting without the need for a position sensor, even under heavy load conditions up to twice the rated load. Its effectiveness is validated through experimental results. Furthermore, it exhibits reasonable simplicity and robustness; thus, providing a promising solution for implementing position sensorless control in SRMs.