PMSLM cogging force suppression based on unequal width combinations of tooth boot shaped slot wedge

DOI:	10.11809/bqzbgcxb2024.11.019
Keywords:	permanent magnet synchronous linear motor; tooth boot shaped slot wedge; unequal width combination; cogging force; electromagnetic characteristics
Abstract:	Aiming at the problem of large cogging force and thrust ripple caused by primary iron yoke slotting in the permanent magnet synchronous linear motor (PMSLM), a 6 slot 8 pole PMSLM with two unit motor combination is taken as the research object, and a tooth boot shaped slot wedge (TBSW) structure is proposed.Through the unequal width combination of TBSW, the unit motors cogging force are offset with each other, so as to achieve the purpose of weakening the overall PMSLM cogging force.The finite element method is used to analyze the influence of the unequal width TBSW structural parameter changes on the motor cogging force and thrust characteristics, and the unequal width TBSW structural parameters are optimized; The electromagnetic characteristics of the original motor, the motor with equal width TBSW, and the motor with unequal width TBSW are compared and analyzed.The results showed that: after using the unequal width TBSW, the motor cogging force is reduced by 96.88%, and the average thrust is increased by 3.83%, and the thrust ripple is decreased by 83.57%, the motor performance is significantly improved.Finally, according to the different parity numbers of the combined PMSLM unit motor, the corresponding unequal width TBSW cogging force suppression scheme is proposed, and the effectiveness of the proposed scheme is verified.
Published:	2024-11-30
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