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US 7,067,949 B2Granted
Rotary electric machine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHaruyuki Kometani, Yoshihito Asao
Life of this patent
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Abstract
An X-phase winding phase portion, a Y-phase winding phase portion, and a Z-phase winding phase portion constituting a three-phase stator winding are each constructed by zigzag-connecting winding phase sub-portions having a phase difference corresponding to an electrical angle of 36 degrees (36°). The rotor is a claw-pole rotor, and permanent magnets are interposed between claw-shaped magnetic poles.
Claims7
A rotary electric machine comprising:
- a stator having:
- an annular stator core in which two slots are disposed per phase per pole;
- and
- a three-phase stator winding mounted to said stator core;
- and
- a rotor rotatably disposed inside said stator for generating a magnetic flux by means of a field winding and a permanent magnet,
- wherein:
- said three-phase stator winding comprises a plurality of winding phase sub-portions each comprising six wave winding sub-portions, wherein each wave winding sub-portion comprises a single conductor wire installed in a slot group constituted by every sixth slot of said slots and each winding phase sub-portion is formed by connecting ends of the conductor wires;
- an X-phase winding phase portion, a Y-phase winding phase portion, and a Z-phase winding phase portion constituting said three-phase stator winding are each constructed by connecting in series pairs of said winding phase sub-portions installed in an adjacent pair of said slot groups;
- and
- said slots are formed at a nonuniform pitch in which an angle between center lines of slot opening portions alternates between an electrical angle of α and (60°−α), where α does not equal 30 degrees.
8 more elements
Dependencies are inferred from the claim text.