Homopolar, Flux-Biased Hysteresis Bearingless Motor

摘要

Described is a bearingless motor based upon a homopolar flux-biased magnetic bearing for force generation and a hysteresis motor for torque generation. The bearingless slice motor levitates and rotates a ring-shaped rotor made of a semi-hard magnetic material. The rotor is biased with a homopolar permanent-magnetic flux, on which 2-pole flux can be superimposed to generate suspension forces. Torque is generated by a hysteretic coupling between the rotor and a rotating multi-pole stator field.

主权项

1. A homopolar flux-biased hysteresis bearingless motor comprising:
(a) a stator comprising a bottom plate and a plurality of teeth projecting from said bottom plate; (b) a flux-biasing structure disposed in a central portion of said stator and having a shape selected such that said stator and said flux-biasing structure define a space having a predetermined shape; (c) a hysteresis rotor disposed in the space defined by said flux-biasing structure and stator; (d) stator windings coupled to said stator teeth and through which electric current may flow to induce two sets of magnetic flux on said hysteresis rotor said two sets of flux corresponding to (1) a motor flux; and (2) a suspension flux; and (e) means for providing a homopolar bias flux which traverses through said hysteresis rotor radially and returns via the stator teeth and the bottom plate of said stator and wherein said stator windings are configured to superpose a motor flux and a suspension flux on the homopolar bias flux to generate a torque and a radial force.