초록 ▼

A permanent magnet rotor is made of a lamination stack having parts formed of a material of high permeability surrounding a shaft and extending radially outward with respect to the shaft, separated by interpolar regions of low magnetic permeability. A plurality of magnets are also included. These co

A permanent magnet rotor is made of a lamination stack having parts formed of a material of high permeability surrounding a shaft and extending radially outward with respect to the shaft, separated by interpolar regions of low magnetic permeability. A plurality of magnets are also included. These components are mechanically contained by the conductors of a starter cage. At least one strength lamination comprised of a magnetic material is stacked with the lamination stack and has an area which is coextensive with the areas of the rotor components. The strength lamination has interpolar bridge portions with cross-sectional areas sufficiently small to minimize interpolar flux leakage. The use of strength laminations periodically interspersed within the lamination stack greatly increases rotor strength without greatly increasing the total flux leakage in the rotor.

대표청구항 ▼

A multi-pole rotor for a synchronous motor comprising: a central rotor shaft having a longitudinal axis; a stack of thin laminations disposed in planes perpendicular to said axis and forming a plurality of subassemblies, said subassemblies comprising the respective poles of the rotor, said thin lami

A multi-pole rotor for a synchronous motor comprising: a central rotor shaft having a longitudinal axis; a stack of thin laminations disposed in planes perpendicular to said axis and forming a plurality of subassemblies, said subassemblies comprising the respective poles of the rotor, said thin laminations having high magnetic permeability, said subassemblies being disposed circumferentially around said shaft with circumferentially adjacent subassemblies separated from one another by axially extending interpolar regions of low magnet permeability, said poles having a circumferential surface; magnetic means associated with said plurality of subassemblies or producing magnet flux which flows through the circumferential surface of the poles of the rotor; at least one strength lamination for dividing said stack in the axial direction into substacks comprised of high permeability material, said strength lamination having a planar configuration which substantially conforms to that of said laminations, said strength lamination having interpolar bridge portions with a cross-sectional area sufficiently small to minimize interpole flux leakage and to hold the subassemblies against centrifical force, said strength lamination defining an aperture therethrough for said magnet means; and means for retaining the thin laminations, between strength laminations, extending axially along said lamination stack from at least one strength lamination to the next, through aligned openings in said stack.