Electric motor winding

Abstract

In accordance with the present invention there is provided improved winding retention means for the field coils in the stator of a rotary electric machine, particularly for coils which are wound in place on the field core by an automatic winding machine. As is well known, winding guides are temporarily secured at each axial end of the stator poles. The shuttles of the winding machine wind successive turns of wire around the poles and in the space between the latter and the winding guides. The retention means includes insulated flat steel wire or strips which .[.are secured to the core as by extending.]. .Iadd.extend .Iaddend.through passages or slots formed in the core laminations. These strips extend out from .[.opposite ends of.]. the core .[.and.]. .Iadd.in both directions and are bent to form off-sets which bear against opposite ends of the core to prevent longitudinal displacement of the strips in the apertures. The end portions of the strips beyond the off-sets extend .Iaddend.underneath the winding guides during the winding operation so as to support the coils after the winding guides have been removed and thereafter are bent around the coils so as to securely anchor the latter to the core and retain them in place.

What is claimed is: 
     
       1. In a rotary electric machine, a stator core having poles, a field coil comprising a plurality of turns of conductive insulated wire wound on each pole and extending axially on either side thereof, said core being formed with an axially extending aperture therethrough located at the circumferential center of each pole, and a strip of .Iadd.electrically insulated .Iaddend.bendable metal .[.secured to said core.]. extending through each aperture and axially beyond said core in each direction, .Iadd.the extending portion of each strip being bent to form off-sets which bear against opposite ends of the core to prevent longitudinal displacement of each strip with respect to the core, .Iaddend.the extending portions of said turns being supported by the extending portions of said strips .Iadd.beyond said off-sets, .Iaddend.said extending portions of said strips being bent around said extending portions of said turns for anchoring said turns in fixed position on said core.  .[.2. A device as defined in claim 1 in which said metal strips are insulated..]. .[.3. A device as defined in claim 1 in which said strips are off-set at the ends of said apertures and bear against the end surfaces of said 
     
     
        stator..]. 4. A device as defined in claim .[.2.]. .Iadd.1 .Iaddend.in which said axially extending apertures are slots formed in the outer 
     
     
        circumferential surface of said stator. 5. A device as defined in claim 4 in which the edges of said slots are upset against said strips to secure the latter in the slots.