Dynamoelectric machine having improved interleaved stator end turns

DETAILED DESCRIPTION This invention relates to multiphase dynamoelectric machines having stator members with multi-loop coils disposed therein constituting a stator winding, and more particularly to joining coil sides of different lengths that are positioned in radially top and bottom positions of a first stator slot to coil sides occupying top and bottom positions in a second and third slot, respectively.
Large dynamoelectric machines designs have evolved which use a rather complicated stator winding disposed in axially extending slots formed in a stator core to handle the voltages and currents required by the loading demands made on the machine.
A large number of stator slots, the use of parallel windings in each phase and the multiple turns per phase require a complex end connection for the winding's slot disposed coil sides.
The end connection must be accommodated in a restricted space, be of rugged construction and provide the necessary electrical communication between the stator coil sides.
The previous design included stator winding having "diamond" shaped coils.
Each coil included a predetermined number of loops with each loop having two coil sides.
The coil sides each included a straight portion which ran the length of the stator slots and a complexly shaped, curved portion situated at each end which facilitated connection with other curved portions.
This curved portion had a complex shape which curved axially, radially and circumferentially.
The manufacturing of this coil side portion required a complex shaped three-dimensional form against which the coil sides were bent and twisted.
The stator coil sides were woven together and connected in the axial end regions of the machine to form the diamond-shaped end-basket design which has been typically used on large dynamoelectric machines.
The woven together end-basket design enables completion of the necessary stator coil side connections and provides a compact and rugged structure.
However, one disadvantage of the end-basket design is that the interweaving of the coil sides makes it impossible to remove a single coil side from the bottom of a stator slot without removing from twelve to eighteen top coil sides which obstruct its removal