基于特征位置磁链开关磁阻电机无位置传感器技术

Sensorless Research on Switched Reluctance Motor Based on Special Position Simplified Flux Method

提出了一种基于特征位置磁链的改进型简化磁链开关磁阻电机无位置传感器技术。与传统简化磁链方法相比,该方法容易实现换相和电机双拍运行,针对12/8结构开关磁阻电机电感与位置关系,选取7.5°和15°作为特征位置,并利用实时磁链与特征位置磁链比较获取三相位置信号。为了提高处理器精度,本文只比较一个特征位置,而另一个特征位置由延迟得到。建立以dsPACE为核心的磁链实测和位置估计的模型,详细分析了7.5°和15°两个特征参考位置对位置估计精度的不同,得出在低速和空载情况下,以15°特征位置磁链为基准估计出来的位置信号比以7.5°特征位置磁链为基准估计出来的位置信号精度要高。最后,通过实验验证了所提方法的正确性和可行性。

A novel improved simplified flux-current method for sensorless of switched reluctance motor （SRM） is proposed based on the flux-linkage data points of feature rotor position.Compared with the conventional methods,the proposed method is easy to implement the phase commutation and the two-phase working.Considering the relationship of the inductance and the rotor position for the 12/8 SRM,the positions of 7.5° and 15 ° are selected as the feature positions,and the three-phase position signals are acquired with comparison of the real-time flux and the feature position flux.In order to improve the accuracy of CPU,only one feature position is compared,while another feature position is obtained by time delay.The experimental platform based on dsPACE of SRM sensorless control system is built.The influence of the two different feature position points on the estimated position is analyzed.The result shows that under the condition of low speed and no load,the accuracy of estimated position signal based on the feature position of 15° is higher than that based on the feature position of 7.5°.Finally,the experiment verifies the feasibility and validity of the proposed method.