High resolution initial rotor position estimation of SRM using peak current detection

Abstract

Existing rotor position estimation schemes strongly depend on prior fed data of inductance models which are subject to phenomenal electromagnetic disturbances, mutual inductance interference which inturn requires high gain bandwidth control logic. With these existing methods, an angle error still lies and gets carried along with when the motor is in rotating conditions. This paper discusses about exact rotor position extraction at standstill for reliable starting procedure without any position sensor. Proposed sensorless method tends to inject high frequency signals for short duration in an 8/6 SRM, thereby peak values of currents of all phases is captured for only 0° to 15° and recorded data is curve fitted to train the machine to detect its rotor position to any arbitrary mechanical degree. Authenticity and feasibility of the proposed algorithm is verified on an 8/6 4-phase SRM through MATLAB/Simulink as a testing platform.