volume | PIER Journals

Abstract

Since the traditional Delta-shaped motor is difficult to achieve the wide speed range while increasing the output torque, it cannot fully meet the complex working conditions of electric vehicles. This paper, from the driving conditions and the principle of variable leakage magnetism, based on the traditional Delta-shaped interior motor, designs a variable leakage flux permanent magnet synchronous motor with a segmented Delta-shaped rotor permanent magnet structure (VLF-DSPM). The permanent magnet is segmented into a magnetic bridge by a ferromagnetic material so that some magnetic lines do not pass through the permanent magnet but directly through the magnetic bridge to increase the d-axis inductance. A magnetic barrier is designed in the q-axis to achieve magnetic leakage in the high-speed region, thereby achieving a wide speed control range. In addition, since the utilization rate of the permanent magnet is reduced due to segmentation, the output torque is reduced. Therefore, transverse bar-shaped permanent magnets are added to increase the reluctance torque of the motor to achieve a higher resultant torque. The key parameters of this structure were then optimized, and finally the electromagnetic characteristics of the VLF-DSPM were studied using finite element analysis in comparison with a conventional Delta-shape interior permanent magnet (DS-IPM) synchronous motor. The results show that the VLF-DSPM has better flux control capabilities, higher output torque, a wider speed range, and higher efficiency and power factor.

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Dr. Xiping Liu

Dr. Jiao Guo

Dr. Ruipan Lu

Dr. Zhangqi Liu

Dr. Baoyu Sun