Hitachi, Ltd.

Yuji Kumagai

Yuzuru Simazaki

Motoo Yamaguchi

Ryota Doi

Iko Fukasawa

Ikou Fukazawa

An electric rotary machine provided with a toroidal winding has a stator core made of annular punched seamless laminations. Insulation members, each having partition plates, are mounted on the stator core. Crossover conductor portions interconnecting unit coils of the toroidal winding are retained and guided by the partition plates. The unit coils in each of the slots formed in the stator core are wound by a single continuous electrical conductor, to yield a machine of highly improved performance.

Electric rotary machine with toroidal windings on an annular stator core

A stator structure for the induction motor is disclosed, in which the winding accommodated in the slots of the stator iron core has one end portion, outside of the stator iron core, shaped to provide a flared bell-like opening, and the other end portion thereof, outside of the stator iron core, forming short-passed winding and being provided with an opening sufficiently large to permit insertion of the shaft of the rotor. Between the inner surface of the short-passed end portion and a given portion of the surface of the stator iron core a coil-supporting member is disposed. The outer surface of the coil-supporting member has a shape along the inner surface of the other coil end portion, while the inside thereof is so shaped as to provide a sufficient space or air gap with respect to the rotor to be inserted. The coil-supporting member is made of an elastic material and adapted to be forcibly fitted between the inner surface of the short-passed coil end portion and the given portion of the surface of the stator iron core from the opening of the bell-shaped coil end portion through the rotor-accommodating cavity formed in the stator core, thus closely contacting the inner surface of the short-passed end portion. Means is provided for bringing at least part of the coil-supporting member into close contact with the short-passed coil end portion and rendering them immovable with respect to each other.

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Tokai-mura, Japan

Yuji Kumagai