关键词: 开关磁阻电机, 无位置传感器, 滑模观测器

Abstract: In response to the limitations of traditional sliding mode observers,this study proposes a dual sliding mode structure based on current observation is developed,in which the traditional sign function in the switching law is replaced by a hyperbolic tangent function to achieve smoother control and mitigate chattering. In the design of the reaching law,a back electromotive force look-up table method is employed to substitute for inductance-based angular derivative calculations, thereby reducing the computational burden on the processor. An error attenuation mechanism is introduced for variable-speed conditions to enhance observation accuracy during abrupt speed changes. Both simulation and experimental results validate
the significant effectiveness of the proposed approach in chattering suppression,computational load reduction,and improved accuracy of speed estimation under abrupt speed changes.

Key words: switched reluctance motor, sensorless, sliding mode observers