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In this paper, a new class of reliable gearless motors, dubbed as the magnetic steering (MS) motor, is proposed to realize the concept of the magnetic differential (MagD) system for direct-drive electric vehicles. While the electronic differential (ED) system can control two individual motors to provide the differential action in the absence of mechanical differential, it suffers from reliability...
The circumferential cooling system, which provides highly effective, integrated but low-cost motor cooling, is introduced. This work is focussed particularly on magnetic effects, which arise from the special construction of the stator core. An explanation for the existence of inter-laminar flux is given and equations for the prediction of its absolute value are derived. Two approaches, an analytical...
The paper investigated the design of a new-type direct-drive axial flux permanent magnet (AFPM) synchronous in-wheel machine specially designed for electric vehicle applications. The machine configuration is simple and easy to manufacture. The machine has good performances such as phase EMF waveform close to sinusoidal waveform and low cogging torque. The electromagnetic design of 6.8 kW AFPM machine...
An axial flux permanent magnet brushless motor is designed with selectable stator alignment of independent stators, thus allowing a controllable and variable generated-EMF constant. This feature has particular value in vehicle traction motors with large constant power speed ratios, where there is also a strong desire to eliminate gear changes and keep the overall size of the motor drive small. The...
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