基于电感模型的SRM变速直驱无传感器控制

Variable-Speed Direct-Driven Sensorless Control of Switched Reluctance Motor Based on Inductance Model

开关磁阻电动机在变速直驱场合要求磁链计算和转子位置估计的准确性。针对零速状态,提出了激励脉冲法辨识转子初始位置。基于电感模型提出了中低速状态下转子位置估计方法。考虑到功率器件导通压降对磁链计算的影响,提出了绕组相电压重构方法和等效电阻校准方法。实验结果表明,电机零速起动无反转,转子位置估计误差较小,整体控制方案易于实现。

Accuracy of flux calculation and rotor position estimation are required in variable-speed direct-driven occasions for switched reluctance motor. At zero speed condition, excitation pulse method was proposed for estimate initial rotor position. Inductance model was proposed for low speed condition. Considering the influence of power device conduction voltage drop on the flux calculation, phase winding voltage reconstruction and equivalent resistance calibration methods were proposed. Experimental results indicate that motor start up without inversion at zero speed, sensorless operation error is Small, the overall control scheme is easy to implement.