12/12磁悬浮开关磁阻电动机时变悬浮系统控制策略

Time-varying Suspension System Control Strategy for 12/12 Bearingless Switched Reluctance Motor

摘要:

12/12磁悬浮开关磁阻电动机（BSRM）转子为凸极结构，定转子磁通量随转子位置变化，导致悬浮力随转子位置变化而变化，具有时变特征。针对时变悬浮系统控制问题，基于有限元软件开展12/12 BSRM悬浮力特性分析，明晰了悬浮系统磁通铰链与转子位置的动态变化关系；利用麦克斯韦应力法区域性建模优势对磁通进行解析，构建了考虑边缘磁通的时变悬浮力数学模型；基于时变悬浮力数学模型构建了名义定常反馈模型和时变悬浮力分量补偿器，进而将时变悬浮力控制系统转换为定常悬浮力控制系统，实现了时变悬浮力的高性能控制。对时变悬浮力数学模型精度、时变悬浮力分量补偿器性能、控制系统性能开展了仿真与实验研究，验证了所提出的时变悬浮系统控制策略的可行性和先进性。

Abstract:

The rotor of a 12/12 bearingless switched reluctance motor （BSRM） has a salient pole structure， and the stator-rotor flux changes with the rotor position， causing the suspension force to vary with the rotor position， exhibiting time-varying characteristics.To address the time-varying suspension system control problem， firstly， the suspension force characteristics of 12/12 BSRM were analyzed by finite element analysis， which clarifies the dynamic variation law between the suspension flux hinge and rotor position. Secondly， the Maxwell stress method with the advantage of regional modeling was used to analyze the magnetic flux and a mathematical model of the suspension force considering the edge flux was constructed. Based on the time-varying suspension force model， a nominal constant feedback model and a time-varying suspension force component compensator were constructed， and the time-varying suspension force control system was converted to a constant suspension force control system， which realizes the decoupling control of the suspension force on the rotor position. Finally， simulation and experimental studies were conducted on the accuracy of the time-varying suspension force mathematical model， the performance of the time-varying suspension force component compensator， and the performance of the control system， verifying the effectiveness and progressiveness of the proposed control strategy.