Design and characteristics of axial magnetic gear using rectangular magnet

Abstract

This experimental study examines the characteristics and performance of axial magnetic gear by using a variation of the rectangular neodymium-iron-boron (NdFeB) magnetic layer which is assembled on an acrylic disc. The aim is to reduce magnetic reluctance which can increase torque and facilitate the manufacture of magnetic gear. In addition, it can reduce the use of NdFeB permanent magnets instead of sectoral magnets. An appropriate method for predicting the transmitted torque produced by axial magnetic gears with four rectangular magnetic layers is demonstrated using the output power approach. The results show that the performance of axial magnetic-gear with 4 layers tends to be similar to the performance of a direct drive. Tests on the 2400 rpm rotation with the loading of 200, 300 and 400 ohms respectively showed a maximum torque of 2.24 (Nm) 10-3, 1.56 (Nm) 10-3, and 1.1 (Nm). The results of this paper appear to be useful for the development of axial magnetic-gear industrial applications.