Double-sided Sandwiched Linear Flux-Switching Permanent Magnet Machines with Staggered Stator Teeth

What is it about?

Linear flux-switching permanent magnet (LFSPM) machines exhibit significant potential in many applications. A double-sided sandwiched LFSPM (DSSLFSPM) machine with high thrust force capability is investigated in this paper. After being optimized for optimal thrust force using Maxwell 2D, this machine is found to deliver higher thrust force when compared with a optimized conventional 12/14 LFSPM machine. However, low thrust force ripple is also required in many applications. Thus, in order to reduce the thrust force ripple, the DSSLFSPM machine is improved by a staggered stator teeth structure and an end PMs method, then, two improved machines are obtained. The improved machines can reduce the thrust ripple to a very low level without thrust force density decrease. Further, the stator yoke thickness of the improved machines is optimized to reach optimal thrust force density. Finally, the performance of the DSSLFSPM-ST machines are analyzed including the normal force, the efficiency and the power factor. It shows that the improved DSSLFSPM machines exhibit relatively low normal force and high thrust force density as well as low thrust ripples, indicating that they are suitable for long-stroke applications.

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Why is it important?

The proposed machines can reduce the thrust ripple to a very low level without thrust force density decrease.

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