MAKING ROTOR AND STATOR POLE ASSEMBLIES

摘要

Complementary laminations for a stator pole assembly and a cooperating rotor pole assembly of an electric motor or generator are produced simultaneously from a plate of magnetic material. The plate is stamped to produce an outer peripheral edge corresponding in shape to the exterior of an annular stator yoke and to produce a central aperture shaped to be received by an indexing element of an indexing table. The plate is then repeatedly indexed about its centre point in equal angular increments and a punch is displaced in areciprocating rectilinear fashion synchronized with the indexing to punch a multiplicity of identical apertures equally-spaced circumferentially. The apertures are shaped to define internal edge surfaces in the plate correspondingin shape to radially inner surfaces of the stator yoke and to radially outer surfaces of a central hub of the rotor pole assembly and to define a multiplicity of identical radial webs. The multiplicity of webs is cut with a circular punch such that the plate is divided into a stator pole assembly lamination with radially-inward projections corresponding in shape to stator poles and a rotor pole assembly lamination with radially-outward projections corresponding in shape to rotor poles.