SIMULATION STUDY OF THE MAGNETIC COUPLING BETWEEN RADIAL MAGNETIC GEARS

The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with two dimensional modelin g 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 o f two magnetic gears with 20 mm radius, the maximum torque occurs betw een 6 and 20 poles which is dependent on the thickness of the iron yok e inside the magnets, and on the magnetization configuration within a pole of the magnets. This is explained by analyzing the magnetic coupl ing strength of each pole. Finally, the computer calculation is tested using an experimental data taken from a sintered NdFeB magnetic gear.