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US 5,304,882 AGranted
Variable reluctance motors with permanent magnet excitation
AssigneeElectric Power Research Institute, Inc.
InventorsThomas A. Lipo, Yuefeng Liao
Life of this patent
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Abstract
A new class of doubly-salient variable reluctance motors which provides greater output torque, higher efficiency, quicker response, and a simple structure in comparison to conventional reluctance motors by utilizing a specific stator/rotor pole arrangement and by altering the magnetic structure of the motor by using permanent magnets to provide a linearly increasing flux linkage over the entire area of pole overlap.
Claims22
A permanent magnet reluctance motor comprising:
- a stator having a plurality of salient poles spaced at equal angular intervals around a central axis;
- a plurality of stator windings, one each of said windings being coiled on one each of said stator salient poles;
- a rotor mounted within said stator for rotation around said central axis, said rotor further comprising,
- a plurality of rotor salient poles spaced at equal angular intervals around said central axis, said rotor salient poles being arranged with respect to said stator salient poles to provide a constant air-gap reluctance during rotation of said rotor within said stator,
- a plurality of permanent magnets embedded in said rotor in two parallel planes on opposing sides of said central axis to serve as a source of flux for magnetizing said rotor salient poles, said magnets being so polarized as to magnetize as south magnetic poles the ones of said rotor salient poles lying on the same side of said central axis as one of said planes and to magnetize as north magnetic poles the ones of said rotor salient poles lying on the same side of said central axis as the other of said planes.
2 more elements
A permanent magnet reluctance motor comprising:
- a stator having six stator salient poles spaced at equal angular intervals around a central axis, and three stator windings corresponding to three phases, each stator winding being coiled around two diametric stator salient poles;
- a rotor mounted within said stator for rotation about said central axis, said rotor having four salient rotor poles spaced at equal angular intervals around said central axis, said rotor further comprising a plurality of permanent magnets embedded in said rotor in two parallel planes located on opposing sides of said central axis to serve as a source of flux for magnetizing said rotor salient poles.
Dependencies are inferred from the claim text.