Transportation electrification has greatly altered the way people live, leading to light-duty vehicles such as electric bicycle, wheelchair, and scooter, which brings great convenience to daily travel. The ability of direct drive and large torque for traction motors is the key to fulfilling faster, safer, and cheaper vehicles. As for the regular permanent magnet (PM) motor, the improvement of torque density is challenging due to the limited magnetic field energy utilization. In this article, a high-torque-density PM traction motor is proposed which features the open-slot stator, and spoke-type magnet rotor with dual-axial-flux bridges. The proposed motor obtains high torque density owing to two benefits. On one hand, the open-slot stator creates additional magnetic field harmonic besides the fundamental one in a regular PM motor. Both field harmonics could engage in electromechanical energy conversion and output torque. On the other hand, the unique design of dual-axial-flux bridges could effectively amplify two-field harmonics, facilitating higher magnet field energy utilization within a limited usage of a magnet. The analytical and simulation results show that the torque density of the proposed motor can reach 30.5 Nm/L at 200 A/cm electric loading, which almost triples that of the regular PM counterpart. Hence, it is of great significance for the development and promotion of light-duty vehicles and has multiple application prospects.
Design and Manufacture of a High-Torque-Density Permanent Magnet Traction Motor for Light-Duty Electric Vehicles
IEEE Transactions on Transportation Electrification ; 10 , 1 ; 379-391
2024-03-01
4010103 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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