Abstract
To investigate the impact of size on its performance in designing an axial-magnetized permanent magnet micromotor, the finite element method is adopted to simulate the magnetic field of the dual rotor motor, and the flux density wave form distributed in the airgap is obtained. The influence of the external dimensions, pole numbers and magnet thicknesses of the rotor, and the airgap distances on the flux density, are analyzed and analytical results are given. With the increase of the airgap distance, the flux density under more poles reduces more quickly than under fewer poles. With the increase of the magnet thickness, the flux density is a rising curve, and after the magnet thickness attains a certain point, the flux density is almost a constant. While reducing the diameter of the rotor, the decrease of the flux density slows down as magnet thickness is reduced. To avoid having a seriously distorted waveform, the distance between inner and outer radii of the rotor must be larger than 1.5 millimeter. Results of the magnetic field analysis can guide a microminiaturization of the motor. Moreover, the results are analyzed theoretically and the simulated values are almost consistent with the experimental values.
Similar content being viewed by others
References
Hameyer K, Nienhaus M. Electromagnetic actuators—current developments and examples. Actuator, 1999
TöPFER J, Pawlowski B, Beer H. Multi-pole magnetization of NdFeB magnets for magnetic micro-actuators and its characterization with a magnetic field mapping device. J Magn Magn Mater, 2004, 270: 124–129
Tang Renyuan. Modern Permanent Magnet Machines—Theory and Design. Beijing: Mechanic Industry Press, 1997 (in Chinese)
Guo Zhanshe, Wu Yihui, Xuan Ming, et al. Electromagnetic planar micromotor and its fabrication. Optics and Precision Engineering, 2003, 11(2): 120–124 (in Chinese)
Wang Guoqiang. Applied Engineering Numeric Simulation Technique and Its Application in ANSYS. Xi’an: Northwestern Polytechnical University Press, 1999 (in Chinese)
Zhao Kaihua, Chen Ximou. Electromagnetics. Beijing: Higher Education Press, 1985 (in Chinese)
Zhou Shouzeng, Dong Qingfei. Super Permanent Magnet. Beijing: Metallurgy Industry Press, 1999 (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Additional information
__________
Translated from Optics and Precision Engineering, 2006, 14(1): 83–88 [译自: 光学精密工程]
Rights and permissions
About this article
Cite this article
Yang, J., Wu, Y., Jia, H. et al. Design method and magnetic field analysis of axial-magnetized permanent magnet micromotor. Front. Mech. Eng. China 2, 318–322 (2007). https://doi.org/10.1007/s11465-007-0056-0
Issue Date:
DOI: https://doi.org/10.1007/s11465-007-0056-0