Magnetic-Coupling Simulation Study of Radial Magnetic Gears and Radial Magnetic Coupling Study of Perpendicular Magnetic Gears

• Main Authors: Hsieh, C.C., 謝浚泉
• Other Authors: Y.D. Yao, D.R. Huang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/06681662081953554643

碩士 === 國立中正大學 === 物理學系 === 84 === The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with two dimensional modeling processes of finite element analysis. The torque is sensitive to the number of magnetic poles, the material of the magnetic gears, and the distance between the magnetic gears. For a 2 mm separation distance of two magnetic gears with 20 mm radius, the maximum torque occurs between 6 and 20 poles which is dependent on the thickness of the iron yoke inside the magnets, and on the magnetization configuration within a pole of the magnets. This is explained by analyzing the magnetic coupling strength of each pole. Finally, the computer calculation is tested using an experimental data taken from a sintered NdFeB magnetic gear. The torque of the radial magnetic coupling between perpendicular magnetic gears with different magnetic poles has been investigated experimentally. The torque of magnetic coupling decreases with increasing the distance between the magnetic gears. For different multipole magnetic couplings with the same magnetic field strength, the torque of magnetic coupling is proportional to the number of magnetic poles at distances smaller than a critical separation distance dc, but it is inversely proportional to the number of magnetic poles as the separation distance becomes larger than dc. This critical separation distance for our sintered NdFeB magnet system is 10 mm. This phenomenon is explained by analyzing the magnetic coupling strength of different poles of magnets on the perpendicular magnetic gears.