关键词: 开关磁阻电机, 角度位置控制, 相电流梯度法, 转子位置估计, 变占空比

Abstract: To solve the problem of large rotor position estimation errors caused by filtering in traditional phase current gradient methods for switched reluctance motors,this paper proposed an improved phase current gradient method combining angle position control and voltage chopper control. Before detecting the phase current peak point, the method used angle position control to eliminate rotor position estimation errors caused by filtering high-frequency chopping, improving estimation accuracy. After detecting the peak point,it switched to voltage chopper control and adjusted the duty cycle in real time according to speed, solving the problem of reduced speed regulation range caused by turn-on angle limitations in traditional methods. Theoretical analysis,simulations and experiments were conducted. The results show that this sensorless control method effectively improves rotor position estimation accuracy, achieves a wide speed regulation range without additional hardware,and proves to be feasible and practical.

Key words: switched reluctance motor,angle position control,phase current gradient method,rotor position estimation,
variable duty cycle