THEORETICAL COMPUTATIONS OF THE MAGNETIC COUPLING BETWEEN MAGNETIC GEARS

The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with both 2D and 3D modellin g processes of the finite element analysis. The torque can be increase d by increasing the number of poles for magnetic coupling between magn etic gears with 2 mm separation distance, provided that the number of poles is less than 10. However, the torque is inversely proportional t o the number of poles when its number is larger than 10. This phenomen on is explained by analyzing the magnetic coupling strength of differe nt poles. The 3D computer simulations are in excellent agreement with the experimental values. The 2D computer simulations can be improved b y a ''two magnetization vectors within a pole'' technique; i.e. by pro perly rotating the angle between the two magnetization vectors.