Patent ID: 7271517

Claim:
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 made from one of a rare-earth magnet and a ferrite magnet, wherein the stator has a core made from one of a rolled steel plate and a silicon 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.