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A thrust ripple reduction method for a permanent magnet linear synchronous motor is introduced. The mover consisting of a magnet, a ferromagnetic plate, and a back yoke is divided into three parts in the stacking direction. Each part is spatially displaced in the moving direction. The evaluation coefficient of the harmonic thrust similar to the distribution factor of the winding predicts the amount...
It is difficult to apply the thrust ripple reduction method to a 4-pole 3-slot permanent magnet linear synchronous motor (PMLSM). This paper describes about a new method of the thrust ripple reduction by using the magnet and the ferromagnetic block affixed to its airgap surface divided into five parts. The validity of the five division method is proved by comparing with the results when the movable...
The magnitude of the thrust and the thrust ripple in a LRM are compared with a PMLSM. The stack height, the mover length and the cross section area of the conductor are adjusted to obtain the same magnitude of the thrust of a PMLSM. The different combinations of the number of pole and the number of slot are discussed. As an example, an 8-pole 9-slot model and a 4-pole 6-slot model are estimated in...
A permanent magnet linear synchronous motor with a ferromagnetic block set on the magnet surface produces an additional reluctance force. Different combinations of the number of pole and the number of slot are evaluated in the magnitude of the thrust and the thrust ripple. The magnitude of the thrust is remarkably improved in a 4-pole 3-slot model. The reduction of thrust ripple is carried out by...
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