Permanent magnet type three-phase AC generator
AssigneesDenso Corporation, Denso Trim Co., Ltd.
InventorNorikazu Takeuchi
Life of this patent
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Abstract
A permanent magnet type three-phase ac generator includes a stator having 3n (n is an integer) teeth and a tree-phase armature winding and a rotor having 4n magnetic poles each of which has a permanent magnet. The three-phase winding includes 3n coils each of which is wound around one of the teeth and connected to form three phase windings, and each coil wound around a first tooth is connected to another coil wound around another tooth that is fourth from the one of the teeth so that vectors of voltage induced in the connected coils can direct in the same direction.
Claims2
A three-phase alternating current generator comprising:
- a bowl-shaped flywheel;
- 4n magnets spaced at equal intervals on an inner circumferential surface of the flywheel, where n is a natural number, each of the 4n magnets being separated from adjacent ones of the 4n magnets by gaps on each side thereof in a circumferential direction;
- and
- a stator, located in the flywheel, comprising:
- 3n teeth provided opposite to the magnets;
- and three coils, each of which are continuously wound around every third tooth among the 3n teeth in a same winding direction and generate electric power by an electromagnetic induction effect with the 4n magnets,
- wherein each of the magnets is a permanent magnet,
- wherein the stator has a core made from a steel plate,
- wherein a Δ-connection is employed as a connection method for the three-phase output,
- wherein all crossovers between teeth of each of the coils extend over the same axial side of the stator,
- wherein the crossovers are arranged along a radially inner portion of the stator, and
- wherein a width in a circumferential direction of each magnet side end of the 3n teeth is wider than a width in a circumferential direction of each gap, and is substantially equal to a width in a circumferential direction of each magnet.
Dependencies are inferred from the claim text.