Abstract
The permanent magnet toroidal motor (PMTM) is a special motor that combines a permanent magnet motor with a deceleration mechanism. Because of the special structure of the PMTM, its reluctance torque includes cogging torque and end torque. In order to reduce the reluctance torque ripple of the PMTM and improve its output stability, the cogging torque and end torque of the motor are optimized, respectively. The structure of eccentric permanent magnet teeth improves the sine of the air gap magnetic induction of the motor, thereby effectively reducing the fluctuation of the cogging torque. It is proposed to add compensation windings at both ends of the central worm stator to reduce the fluctuation of the end torque. The dynamic compensation effect and the change in air gap magnetic induction intensity with the current applied to the compensation windings are analyzed by finite element simulation. The relationship between the compensation current and the structure parameters of the motor is derived. Finally, it is verified that the output torque ripple can be effectively reduced by adding the magnetic isolation material between the compensation winding and the three-phase winding. The research results show that the reluctance torque fluctuation can be greatly reduced by using eccentric permanent magnet teeth and compensation windings. It provides an important reference basis for the optimization design of the electromagnetic structure of the PMTM.
Highlights
Permanent magnet synchronous motor has the advantages of simple structure, reliable operation, and high torque density
This paper studies the reluctance torque of the permanent magnet toroidal motor (PMTM), and the reluctance torque is separated into cogging torque and end torque for optimization analysis
The cogging torque and the end torque of the permanent magnet toroidal motor are studied in this paper
Summary
Permanent magnet synchronous motor has the advantages of simple structure, reliable operation, and high torque density. The influence of the cogging torque can be reduced by adjusting the distance between magnetic poles, optimizing the shape of magnetic poles, and adopting the installation method of the inclined permanent magnet teeth.. Aiming at the end torque fluctuation caused by the finite stator length of the permanent magnet synchronous linear motor, the optimization design method of adding auxiliary magnetic poles. For the arc-shaped permanent magnet synchronous motor, the stator length is optimized to adjust the phase difference between the left and right end-effect forces, so as to reduce the torque fluctuation.. For the arc-shaped permanent magnet synchronous motor, the stator length is optimized to adjust the phase difference between the left and right end-effect forces, so as to reduce the torque fluctuation.12 It can be seen from the above analysis that there are currently two main methods for optimizing the end torque. The influence of the combination of the two structural optimization methods on the reluctance torque and output torque of the motor is analyzed
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