关键词: 开关磁阻电机, 无位置传感器容错控制, 中高速方法, 电流梯度检测, 导通区间

Abstract: In the traditional current gradient sensorless control method, using a fixed position as a feature point may lead to errors in rotor position estimation. A dynamic extension strategy for the phase conduction region was proposed, which dynamically extends the conduction region when there was an error in the current gradient detection, there by enhancing the system's fault tolerance. An improved current gradient sensorless method based on the dynamic estimation of the current gradient zero-crossing position was realized through polynomial modeling, reducing the estimation error of the current gradient zero-crossing position at different speeds. Experimental results under different conditions have verified the
feasibility and effectiveness of the proposed synthetic scheme based on the dynamic extension strategy for the conduction region and the improved current gradient sensorless method.

Key words: switched reluctance motor, sensorless fault-tolerant control, medium and high speed operation, current gradient detection,conduction interval