Enhanced transverse-flux motor with torus coils

Abstract

Two of the most important characteristics of electric vehicle motors are their low cost and high reliability. Unfortunately, armature windings of such motors are difficult to manufacture with automated techniques and are not very reliable. Thus, to obtain a motor at low cost with high reliability, we investigated a transverse-flux motor (TFM) containing a torus coil. In this study, we propose an enhanced TFM and discuss its principles and basic characteristics. The rotor comprises radially magnetized permanent magnets, and the stator comprises torus coils and axial 9-shaped cores. The stator core is alternately arranged in the circumferential direction and has radial and axial air gaps. Results of our analysis confirm that the enhanced TFM produces a high torque per motor volume of 4.72 kN·m/m3.