Abstract: An apparatus and method for the production of relatively large diameter annular components, such as stator cores for electric motors, without excessive waste of material. In one embodiment, a first progressive die assembly forms a plurality of identical pole pieces each made of a plurality of individual stacked and interlocked laminations. The pole pieces, having protruding end portions, are loaded into a rotary carousel. A second progressive die assembly forms a continuous strip including a plurality of body segments connected via hinge portions disposed adjacent recesses between the body segments that are dimensioned to receive the protruding ends of the pole pieces.

Abstract: An apparatus and method for the production of relatively large diameter annular components, such as stator cores for electric motors, without excessive waste of material. In one embodiment, a first progressive die assembly forms a plurality of identical pole pieces each made of a plurality of individual stacked and interlocked laminations. The pole pieces, having protruding end portions, are loaded into a rotary carousel. A second progressive die assembly forms a continuous strip including a plurality of body segments connected via hinge portions disposed adjacent recesses between the body segments that are dimensioned to receive the protruding ends of the pole pieces.

Abstract: An apparatus and method for the production of relatively large diameter annular components, such as stator cores for electric motors, without excessive waste of material. In one embodiment, a first progressive die assembly forms a plurality of identical pole pieces each made of a plurality of individual stacked and interlocked laminations. The pole pieces, having protruding end portions, are loaded into a rotary carousel. A second progressive die assembly forms a continuous strip including a plurality of body segments connected via hinge portions disposed adjacent recesses between the body segments that are dimensioned to receive the protruding ends of the pole pieces.

Abstract: An apparatus and method for the production of relatively large diameter annular components, such as stator cores for electric motors, without excessive waste of material. In one embodiment, a first progressive die assembly forms a plurality of identical pole pieces each made of a plurality of individual stacked and interlocked laminations. The pole pieces, having protruding end portions, are loaded into a rotary carousel. A second progressive die assembly forms a continuous strip including a plurality of body segments connected via hinge portions disposed adjacent recesses between the body segments that are dimensioned to receive the protruding ends of the pole pieces.

Abstract: Complementary packs of laminations (41, 43) are provided for use in an electromagnetic device, the laminations in different layers having legs of length that alternates according to a predetermined pattern. The lamination of one pack (41) can fit into the laminations of another pack (43) which has legs alternating according to a complementary pattern. The packs (41, 43) can be push-fitted together about a bobbin (45) to form an interleaved stack of laminations for a transformer or other electromagnetic device. A method and apparatus for forming the stacks are also described.

Abstract: Packs of laminations and a method of assembling the packs of laminations to make a core of an electromagnetic device such as a transformer or motor are described. First and second packs of complementary laminations (12, 14) are provided that fit relatively freely together and have interfitting formations e.g. dovetail formations (16) and projections (18). Preferably adjacent laminations of each pack are attached. The first and second packs of laminations (12, 14) are held positively together in mechanical contact e.g. in a jig. The formations (18) on one or both of the laminations are then deformed to engage the formations (16) of the other lamination to clamp the first and second packs of laminations (12, 14) together. In an alternative form the first and second packs of laminations clip together.