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US 6,794,784 B2Granted
Permanent magnet reluctance motor with embedded permanent magnet holes
AssigneesKabushiki Kaisha Toshiba, Toshiba Industrial Products Manufacturing Corporation
InventorsNorio Takahashi, Yutaka Hashiba, Kazuto Sakai, Masanori Arata, Yukihiko Kazao, Takashi Araki, Masakatsu Matsubara, Yasuo Hirano
Life of this patent
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Abstract
Permanent magnets are arranged to be supported by the provision of permanent magnet position-locating projections (12) in permanent magnet embedding holes (5). By optimizing the shape of thin-wall regions (18) and (19) within rotor core (4), leakage of flux generated from the permanent magnets is reduced and the strength of the thin-wall regions where stress is concentrated is ensured.
Claims11
A permanent magnet reluctance motor comprising:
- a stator having an armature coil;
- a rotor configured for providing magnetic irregularities in a circumferential direction wherein the rotor includes permanent magnets in a plurality of permanent magnet embedding holes within a rotor core wherein a magnetic flux of an armature passing through between adjacent magnetic poles is canceled, and wherein the rotor further includes non-magnetic regions on a circumferential side of said permanent magnets between said magnetic poles;
- and
- a plurality of projections configured to fix positional location of said permanent magnets, the plurality of projections configured to project into said permanent magnet embedding holes within said core of said rotor, at least one of the plurality of projections having a substantially planar surface portion configured to planarly contact a length of at least one side of the permanent magnet, the length being bound by an edge of the permanent magnet.
1 more element
Dependencies are inferred from the claim text.