Study on Force-Transmissibility of a Magnetic Gear by Using 3-D Boundary Element Analysis

Abstract

This paper presents three-dimensional boundary element analysis for coupled magnetic field and moving problem. The method is applied to improve transmission characteristics of a magnetic gear and the usefulness is demonstrated. The gear has two movers consisting of permanent magnets and they rotate with different velocity. The double gap moving problem is very time consuming, because the mesh has to be regenerated at each time step or prepared many patterns previously. The use of the boundary element method is suitable for this problem, because meshes are required around only surfaces of considering objects and the objects can be rotated any angle according to the moving simulation. In this paper, the technique to reduce unknown variables in the boundary element equations utilizing symmetrical construction is proposed.

Design of the Maximum Transmission Torque for Cylindrical Magnetic Gears

“…So, many problems, which the wear, the dust and the noise are occurring by the contact of the ordinary gear tooth, can be removed. About transmitting a torque, many reports have studied on reduction of improvement of the maximum transmission torque and the cogging torque [1][2][3][4][5][6][7]. Also, the magnetic gear steps out when the exceed torque is inputted.…”

Relationship between Number of Teeth and Transmission Torque on Cylindrical Magnetic Gear

“…So, many problems, that the wear, the dust and the noise are occurred by the contact of the gear's tooth, can be solved. About transmitting a torque, many reports have studied the cogging torque and the maximum transmission torque [1][2][3][4]. But the relationship between the transmission torque and the number of teeth has not been reported.…”