控制策略对无轴承开关磁阻电机定子振动的影响

Effects of Control Strategies on Stator Vibration of Bearingless Switched Reluctance Motors

介绍了无轴承开关磁阻电机(BSRM)的基本原理和3种负载控制策略,分析了3种负载控制策略确定控制参数的方法。由于脉动的径向电磁力是开关磁阻电机定子振动和噪声的根源,将麦克斯韦张量法和磁路法结合起来计算了不同控制策略下无轴承开关磁阻电机定子极受到的径向电磁力。3种控制策略求解过程所引入的约束条件不同,即使在相同的负载条件下,计算出的主绕组和悬浮绕组电流及超前角也各不相同,电机定子极径向电磁力特性也各异。通过时域分析和频域分析的方法研究了定子极径向电磁力特性,得到了3种控制策略对定子振动的影响。最后通过实验验证了理论分析所得结论的正确性。

The fundamental principle and three kinds of load-control strategies of bearingless switched reluctance motors （BSRMs） are introduced.The methods to determine the control parameters of these control strategies are analyzed.Since the origin of vibration and acoustic noise of switched reluctance motor is magnetic radial force ripple acted on stator,the stator magnetic radial forces of bearingless switched reluctance motor under these three different control strategies are calculated by combining the methods of Maxwell stress tensor and magnetic circuit method.Due to the differences of constraint conditions for three kinds of control strategies,even under the same load,the main winding current,the suspended winding current and the advanced angle obtained by calculation are different,therefore the performances in the stator magnetic radial force are also different.Effects of control strategies on stator vibration of bearingless switched reluctance motor are obtained by using time domain analysis and frequency domain analysis upon the stator magnetic radial force.Finally,conclusions reached by theoretical analysis are verified by experiments.