Magnetic Field Analysis and Thrust Optimization of Arc Permanent Magnet Synchronous Motor Combined With Linear Mover and Arc Stator

The intelligent annular transmission system driven by permanent magnet synchronous linear motor (PMSLM) is composed of linear and arc segments. When the mover enters the arc segment from the straight segment, the coupling area between the primary and secondary becomes smaller. It results in that the average thrust decreases and the thrust ripple increases. This phenomenon affects the control accuracy and operation reliability. This paper focuses on the research on the arc permanent magnet synchronous motor (A-PMSM) in the arc segment of the annular transmission system. The equivalent magnetic network model of A-PMSM is established. The air-gap coefficient is used to compare the slot effect of arc primary structure with that of straight primary structure. The influence of arc radius and radial width on the slot effect of A-PMSM with linear mover is obtained. The structure of magnetic pole, the radial width of secondary and the slot width are optimized by the combination of hierarchical optimization and orthogonal optimization. The A-PMSM's performance of thrust is optimized, which provides experience for the design of the motor in the annular transmission system.