基于转子偏心坐标系的无轴承永磁薄片电机径向悬浮力模型

针对无轴承永磁薄片电机(BPMSM)运行时转子悬浮不够稳定的问题,研究了影响BPMSM转子悬浮性能的主要因素,即转子径向悬浮力模型。依据位移补偿控制理论和角坐标系的概念,建立了新的转子偏心坐标系。在转子偏心坐标系下,基于麦克斯韦应力张量法,利用积分和三角变换推导了转子径向悬浮力模型,并设计悬浮力绕组电流直接控制系统。建立电机的有限元模型,通过对比径向悬浮力的有限元分析结果与数学模型计算结果,验证了所推导数学模型的正确性与准确性。

Radial suspension force model of bearingless permanent magnet slice motor based on coordinate system of rotor eccentricity

For bearingless permanent magnet slice motor ( BPMSM) ,that rotor suspension is not stable in operation.To solve this problem,radial suspension force model was researched as the main factor effecting suspension performance.According to theory of displacement compensation control and concept of angle coordinate system,coordinate system of rotor eccentricity was designed.Based on Maxwell stress tensor method,a radial suspension force model was deduced through integration and trigonometric transformation under the coordinate system.A direct suspension force winding current control system was also designed based on the model.The result is verified by finite element method (FEM),comparing the motor radial suspension force results of FEM and mathematical model calculation.