Abstract: A permanent magnet rotor has a plurality of high performance permanent magnets supported in each set of a plurality of stacked rotor laminations of magnetic material, with holding laminations at each end of each set of the stacked rotor laminations enclosing the magnets. Bolts extend through aligned holes in all of the laminations to enable nuts to be attached, to form a stacked and bolted assembly. The magnets are preferably radially disposed and equiangularly spaced from each other. A groove is disposed in each of the laminations between a non-magnetic shaft and the inner end of each of the magnets to reduce flux leakage. An electrically conducting and non-magnetic material is disposed at the outer end of each of the magnets, to reduce flux leakage.

Abstract: An automatic welding machine for arc-welding stator core laminations is disclosed. The machine carries singular or plural workpieces which are fixtured on a vertical slideway. A slide moves past relatively stationary welding guns which are independently adjusted and independently activated for the weld process. The workpieces may be indexed for desired weld spacing. In one embodiment the indexing may be manual or power actuated. In another embodiment the guns may be varied as to radial position as the workpiece is moved, to weld non-constant cross-sectioned parts.