14 Multi-Pole Coil Three-or Two-Phase Linear PM Reluctance Motors

Linear electric motors discussed in previous chapters relied on primary coils that span a little more or less than a pole pitch. By pole pitch, we mean the half period of PM flux as the common attribute of many “novel typologies” with dedicated names.

In this chapter, we treat a variety of three- or two-phase linear PM motors that contain multi-pole nonoverlapping coils and are characterized by the following:

  • Smaller copper weight per Newton of thrust and thus smaller copper losses; flat configurations are preferred, but tubular ones may be imagined also.

  • Due to separate electric and magnetic circuit design, more armature mmf at small pole pitches (needed at low speeds) could ...

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