Abstract
This paper presents a systematic approach of optimal design for an axial-flux permanent magnet wheel motor to have high torque density for light electric vehicles. First, the winding type and the numbers of slots and poles are determined at the stage of preliminary design. A magnetic circuit model with an effective air-gap distribution is then established for sensitivity analysis and multifunctional optimization. Finally, the finite element analysis is performed for verifying and refining the motor with the best torque density to fulfill design specifications. The theory of maximum torque per ampere is also applied to estimate the torque and power versus speed curves of the resulting wheel motor before it is fabricated.
Highlights
Electric vehicles (EVs) have imperatively attracted quite a few researchers and automobile companies in developing more efficient and reliable propulsion systems, because of the increasing concerns about natural environment and growing shortages of petroleum resources [1]
This paper presents an optimal design of an Axial-flux permanent magnet (AFPM) wheel motor of Kaman type for an light EV (LEV)
This paper has proposed a systematic approach for the design of a high torque density AFPM wheel motor for light electric vehicles
Summary
Electric vehicles (EVs) have imperatively attracted quite a few researchers and automobile companies in developing more efficient and reliable propulsion systems, because of the increasing concerns about natural environment and growing shortages of petroleum resources [1]. It has been an important issue to improve the motor performance in terms of efficiency and torque and power densities [2]. Axial-flux permanent magnet (AFPM) motors usually have better torque and power densities than traditional radial-flux PM motors, and are taken into consideration for driving a light EV (LEV) in this research. Due to the relative position of stators and rotors, the Kaman type has better heat dissipation property than the Torus type motor [3] [4]. This paper presents an optimal design of an AFPM wheel motor of Kaman type for an LEV. The optimal design is performed with one-dimensional magnetic circuit model so that the torque, torque density and efficiency of the AFPM motor are maximized and the torque ripple is minimized, subject to a set of constraints. The finite element analysis is used to verify and refine the final shape of the motor, and the performance curves are estimated before the fabrication of prototype
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