Online Phase Resistance Identification Strategy for Position Sensorless SRM Drives

Abstract

This paper proposes an online phase resistance identification method based on approximate sliding mode resistance observer (ASMRO) for switched reluctance motors (SRMs), which constructs a sliding mode error function based on the rotor position and phase current information and further constructs a sliding mode identification system to achieve accurate phase resistance identification of SRMs. The rotor position information required by ASMRO is provided by a rotor position observer rather than a physical position sensor. The ASMRO proposed in this paper can provide accurate resistance value of SRMs, and reduce the problem of poor system control accuracy caused by the change of resistance value. The proposed method has simple logic, good real-time performance, and high recognition accuracy, which is important for improving the applicability and speed regulation performance of SRMs.