Abstract
Abstract - This paper deals with torque analysis of magnetic spur gear with radial magnetized permanent magnets based on analytical method. The analysis is implemented in three parts: First, on the basis of magnetic vector potential and a two-dimensional (2D) polar-coordinate system, the magnetic field solution due to permanent magnet of source gear are obtained. And by using derived magnetic field solutions, the analytical solutions for external magnetic field distribution which affects load gear are obtained. Second, by using coordinate conversion, external magnetic field which is on the primary coordinate system is converted to the secondary coordinate system. Finally, the load gear is reduced to equivalent current densities, and the torque is computed on these currents in the external field of the source magnet. These analytical results are validated by comparing with the 2-D finite element analysis (FEA).Key Words : Magnetic spur gear, Coordinate conversion, Analytical solutions, FEA†Corresponding Author : Dept. of Electrical Engineering,Chungnam National University, Korea.E-mail: choi_jy@cnu.ac.kr* Dept. of Electrical Engineering, Chungnam National University,Korea.** Korea Research Institute of Ships & Ocean Engineering, Korea.Received : January 30, 2015; Accepted : March 22, 2015그림 1 기어의 구조 : (a) 기계적인 스퍼 기어 (b) 자기 스퍼 기어Fig. 1 Structure of : (a) mechanical spur gear (b) magnetic spur gear
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