Modeling of Axial Flux Permanent Magnet Motors by a Finite Element Approach-Application to In-wheel Motorcycles

Abstract

Axial flux permanent magnet motors have been applied for many electric vehicles due to the high torque and power densities, compact sizes and multipolar disc-type structure. In this paper, the axial flux permanent magnet motor with the concentrated winding, and axial flux- segmental rotor is studied to apply for in-wheel motorcycles, where the proposed structure consists of permanent magnet segments and slotted stators. By this way, the amount of permanent magnets are reduced  and the  scale up power and torque are high. This means that it makes the assembly easier and reduce the cost compared to conventional motors (e.g. BLDC motors). Especially, for a multipolar disc-type structure, the axial flux permanent magnet motors is easy to scale up power for the next models. The detailed design and operation of the proposed machine are presented, and the performance is also evaluated for an in-wheel traction application. The target design is impore torque per volume about 5 or 10% in comparison with conventional design which has torque per volume TRV (kN.m/m3) is from 45 to 50. This paper will provide a multi-module design of AFPM for in wheel motorcycles in express delivery (Viettel post) with optimal magnet embrace angle.