无轴承薄片电机二维被动悬浮特性

为了研究无轴承薄片电机的被动悬浮特性,通过2D磁路分析的方法,建立了非永磁薄片电机的2D轴向悬浮力模型和回复力矩模型,并进行了有限元仿真验证。直接采用有限元分析的方法,得出了永磁薄片电机的被动悬浮力与电机各参量之间的关系。结果表明:电机的轴向悬浮力基本与轴向偏移、电机半径成线性关系,但与电机的轴向长度无明显关系,且气隙磁密越大悬浮力越大;电机的回复力矩随扭转角度增长而增长,电机的长径比较大、等效气隙较小时将难以产生回复力矩,回复力矩随着电机的轴向长度增加而增加,达到最大值后逐渐下降直至反向。

2D analysis of passive suspension characteristics of bearingless slice motors

To study the passive force characteristics of the bearingless slice motor,by 2D magnetic circuit analysis,the axial suspension force model and back torque model are built for non-PM motor.And the models were vilified by finite element method(FEM).The PM motor was directly analyzed by 2D-FEM to attain the relationship between the passive force and the motor parameters. The results indicate that the axial suspension force is basically linear with the axial displacement and the motor radius.And the higher gap flux density,the larger suspension force.But the force has no obvious relation with the motor axial length.The back torque rises with the increase of torsion angle.If the ratio of the motor axial length to the motor radius is too large or the gap length is too small,the back torque is hard to be generated.And the back torque rises with the increase of the motor axial length until the torque reaches the top,then the torque drops again until its direction is reversed.