GB1100499A - Improvements in and relating to dynamo-electric machine slot wedges and methods of manufacturing such wedges - Google Patents

Abstract

1,100,499. Securing coils for dynamo-electric machines. ELECTROMOTORENFABRIEK " DOROT " N.V. 9 March, 1966 [15 March, 1965], No. 10335/66. Heading H2A. In a wedge for retaining the winding in the slots 2 of the magnetic core, e.g. a laminated stator, of electric machines, laminµ 5b, 5c of ferromagnetic material are secured to a strip 6 of electrically insulating non-magnetic material and the laminµ and strip are embedded in a filling material 7, e.g. a synthetic resin which fills the cavities within the outer profile of the laminµ. The laminae may be of various shapes, e.g. C, D, or O-shapes (Figs. 4, 5, 6 and 7, not shown), which are glued and slipped round the strip 6 of synthetic resin reinforced with glass fibres. After the glue has hardened, the strip and laminµ are embedded in the filling or synthetic resin material which may extend round the outside of the laminµ. The intermediate parts d (shown) and e (Figs. 6 and 7, not shown), of the laminµ can be removed before the filling 7 is applied so as to prevent the stator teeth 3 being electrically interconnected or can remain so as to provide magnetic shunts in the stator slots 2. The stator may have radial cooling gaps (4, Fig. 2, not shown), in which case the laminµ of the wedges are discontinued in the region of the cooling gaps.