无轴承开关磁阻电机缺相运行的控制方法

Control Method for Lack of one Phase in Bearingless Switched Reluctance Motors

基于开关磁阻电机(Switched Reluctance Motor,SRM)固有的容错性能,研究无轴承开关磁阻电机(Bearingless Switched Reluctance Motor,BSRM)在缺相运行时的转矩、悬浮力协调控制方法。首先建立BSRM在缺相运行时的数学模型,分析其转矩分布特性,研究缺相运行时的转矩补偿方法。通过延长导通相开通区间,保证了无轴承电机在缺相运行时悬浮力产生的连续性。同时,为减小由于悬浮力补偿而产生的负转矩,提出了负转矩区主、悬浮绕组电流的优化控制方法。采用有限元法仿真说明所提缺相控制算法的正确性,并通过实验验证了该方法在BSRM缺相运行时具有良好的控制性能。

Based on the fault-tolerance ability of switched reluctance motor（SRM）, control strategies of levitation-force distribution and torque compensation are discussed under the open-phase operation of the bearingless switched reluctance motor（BSRM）. The mathematical model of torque and the compensation strategy are introduced. The control method ensures the continuity of the levitation force, through the force-compensation for the abnormal phase. In addition, a calculating method of levitation currents is presented, in order to decrease negative torque from levitation force compensation By using finite-element analysis, the algorithm is shown, and the experiment validates that the strategy had available control ability under the open-phase operation.