Magnetic circuit for the stator of an electric motor and stator equipped therewith

Claim 1

In a magnetic circuit for the stator or an electric induction motor having a body, a rotor within said stator forming an air-gap intermediate said stator and rotor, the improvement comprising; two outer sides on said stator, said stator including a packet of stacked laminations provided with laterally open slots, substantially rectilinear active portions of winding turns disposed within said slots and having free ends overhanging from said slots, each said slot having a surface covered by a molded internal layer of an electrically insulating material to form a laterally open insulating channel for insulating said active portions of said winding turns disposed within said slots, an electrically insulating lateral layer uniting said internal layer of each said slot with said internal layer of two adjoining ones of said slots adjacent said stator two outer sides, said internal and lateral layers providing a one-piece molded layer over said slots to ensure insulation of said slots from said motor body and at least cohesion of said packet of laminations, said one-piece molded layer including, on each said outer side of said stator, a sleeve portion projecting outwardly in an axial direction and defining an elongated cylindrical sleeve concentric with said air-gap and adapted to provide covering and protection of said free ends of said winding turns disposed in said slots said stator including a yoke, a molded outer casing integral with said one-piece molded layer and, an electrical terminal box attached to said outer casing.