动磁型同步表面电机的磁场和推力

针对传统定位工作台速度和定位精度低的缺点，提出了一种采用定子铁心和相互垂直分布的两对推力绕组做定子、动子平台，以及附着在其下表面的4个Halbach磁阵做动子的动磁型同步表面电机．采用分离变量法获得了表面电机磁场强度、磁通量密度、磁通量、反电动势和电磁推力的表达式，并分析了磁阵厚度、节距、极数、线圈厚度和空气隙长度等不同设计参数对表面电机推力的影响，得到了在最大推力下表面电机的设计参数．将计算结果与二维有限元结果进行对比，证明了分析方法的正确性和参数计算方法的可靠性，为进行表面电机动力学建模和仿真，以及伺服控制系统的开发和设计提供了研究基础．

Magnetic Field and Thrust of Moving Magnet Synchronous Surface Motor

To solve the difficulty of lower speed and precision of the conventional stage,a moving magnet type synchronous surface motor(MMSSM) with slotless iron yoke and Halbach array is designed,where the stator and mover are composed of four electromangetic coils and four Halbach arrays respectively.The magnetic field distributions are derived analytically in terms of magnetic scalar potential with the method of separation of variables.On the basis of the analytical field,the expressions of the flux linkage,back-electromotive force(EMF) and thrust force are acquired and examined,and the chief design parameters,such as air gap length,pole number,magnet thickness and coil thickness,are optimized to maximize the thrust force of the MMSSM.A comparison between the results of the proposed method and finite element analysis verifies the feasibility and credibility.The proposed method facilitates the characterization of MMSSM and provides a basis for system dynamic modeling and simulation and servo control development.