一种多自由度电机三维磁场分析及永磁体设计

在简述永磁球形多自由度电机的优越性能的基础上,针对一种新型永磁球形多自由度电机提出了4种永磁转子设计方案,对每一种永磁体结构进行了静磁场磁通密度模值和磁场分布计算,建立了球坐标下永磁体磁场解析求解模型,进行对比分析.同时基于三维有限元软件,对各种永磁转子结构的球形多自由度电机转矩特性进行了计算和仿真.设计制备了5个圆柱体组合结构的钕铁硼永磁转子来代替球形结构,制作了模型样机.理论分析和实验结果表明了所设计结构的有效性,转子易于实现三自由度偏转运动,并对转子永磁体的受力进行了测试,与仿真计算结果一致.

3D magnetic field analysis and permanent magnet design of a M-DOF motor

Based on the brief introduction of the superior performance of permanent magnet(PM) spherical multi-degree-of-freedom(M-DOF) motors in this paper,four kinds of permanent magnetic rotor design schemes for a novel PM spherical M-DOF motors were presented.The static magnetic flux density modulus value calculation and static magnetic field analysis of each kind of permanent magnet structure were implemented,and the analytical model of magnetic field in the spherical coordinate was developed with comparison results.The torque characteristics of the PM spherical M-DOF motor with different rotor structures were calculated using 3D finite element software.Finally the NdFeB rotor with five-cylinder structure instead of the ideal spherical structure was adopted to manufacture the prototype.The theoretical analysis and experiment results demonstrate the effectiveness of the designed structure.The rotor is easy to achieve three-degrees-of-freedom deflection,and the forces on permanent magnets of rotor are tested,which are consistent with the simulation results.