关键词: 微电机, 轴向磁化, 有限元分析, 洛仑兹力, 转矩

Abstract: In order to study the size effect of the axialmagnetized permanent magnet dual rotor micromotor on its performance, the elementedge based finite element analysis method was adopted to simulate the torque of the motor. The simulated torques of a motor with 20 mm diameter were compared with the experimentally measured ones and a good agreement between them was achineved. The winding density in the stator was analyzed, and the obtained optimal scheme is that both the line width and the space between the lines are 50 μm. The minimum dimension of the motor confined by the configuration, torque of 47 μN·m, and air gap magnetic flux density, etc., was also analyzed and it was reached that the motor with 10 mm diameter and 5.2 mm thickness may satisfy the practical application needs in the area of fine mechanics with the electric current of 0.1A. The suggested analysis method is beneficial to the design and miniaturization of the micromotor.

Key words: micromotor, axialmagnetization, finite element analysis, Lorentz force, torque