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US 10,177,627 B2Granted
Homopolar, flux-biased hysteresis bearingless motor
AssigneeMassachusetts Institute of Technology
InventorsMinkyun Noh, David L. Trumper
Life of this patent
Estimating the term…
Abstract
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.
Claims41
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.
4 more elements
A pump comprising:
- (a) a homopolar flux-biased hysteresis bearingless motor comprising:
- a stator comprising a bottom plate and a plurality of teeth projecting from said bottom plate;
- a flux-biasing structure disposed in a central portion of said stator and having a shape selected to define a space having a predetermined shape;
- a hysteresis rotor disposed in the space defined by said flux-biasing structure and stator;
- stator windings coupled to said stator and through which electric current may flow to induce two sets of magnetic flux:
- (1) a motor flux;
- and (2) a suspension flux;
- and
- a permanent magnet for providing a homopolar bias flux which traverses through said hysteresis rotor radially and returns via the teeth and the bottom plate of the stator and wherein said stator windings are configured to superpose a two-pole suspension flux on the homopolar bias flux to generate a radial force;
- and
- (b) an impeller assembly disposed in relation to said stator in the space defined by said flux-biasing structure and said stator teeth, said impeller assembly comprising
- an impeller;
- and
- a hysteresis rotor coupled to said impeller.
11 more elements
A homopolar flux-biased hysteresis bearingless motor comprising:
- (a) a stator comprising a annular back iron yoke, a plurality of teeth projecting from said back iron yoke
- (b) a flux-biasing structure comprising a bottom place and a flux collector column projecting from said bottom plate and disposed in a central portion of said stator, said flux collector column having a shape selected to define a space having a predetermined shape;
- (c) a hysteresis rotor disposed in the space defined by said flux collector column and said stator teeth;
- (d) stator windings coupled to said stator and through which electric current may flow to induce two sets of magnetic flux:
- (1) a motor flux;
- and (2) a suspension flux;
- and
- (e) a permanent magnet disposed on a peripheral portion of said stator and distal to the stator windings, said permanent magnet disposed to provide a homopolar bias flux which traverses through said hysteresis rotor radially and returns via the back iron yoke of the stator and wherein said stator windings are configured to superpose a two-pole suspension flux on the homopolar bias flux to generate a radial force.
5 more elements
A pump comprising:
- (a) a homopolar flux-biased hysteresis bearingless motor comprising:
- two stators each comprising a plurality of stator teeth and a back iron yoke;
- stator windings coupled to said stator teeth and through which electric current may flow to induce two sets of magnetic flux:
- (1) a motor flux;
- and (2) a suspension flux;
- and
- a permanent magnet disposed between the back iron yokes of said stators and distal to the stator windings, said permanent magnet disposed to provide a homopolar bias flux which traverses from the teeth of one stator through said hysteresis rotor and returns via the teeth the other stator and wherein said stator windings are configured to superpose a two-pole suspension flux on the homopolar bias flux to generate a radial force;
- and
- (b) an impeller assembly disposed in a central portion of said stator, said impeller assembly comprising:
- an impeller;
- an iron core coupled to a central portion of said impeller;
- and
- a double hysteresis rotor coupled to said impeller.
10 more elements
A pump comprising:
- (a) a homopolar flux-biased hysteresis bearingless motor comprising:
- a stator comprising a plurality of stator cores;
- stator windings coupled to said stator cores and through which electric current may flow to induce two sets of magnetic flux:
- (1) a motor flux;
- and (2) a suspension flux;
- and
- (b) an impeller assembly disposed in a central portion of said stator, said impeller assembly comprising:
- an impeller disposed in a central portion of said stator;
- a hysteresis rotor coupled to said impeller;
- a permanent magnet provided as part of said hysteresis rotor, said permanent magnet disposed to provide a homopolar bias flux which traverses through said hysteresis rotor radially and returns via the stator cores and wherein said stator coils are configured to superpose a two-pole suspension flux on the homopolar bias flux to generate a radial force.
7 more elements
A bearingless motor comprising:
- a hysteresis rotor provided from a semi-hard magnetic material;
- a homopolar flux-biased electromagnet configured to levitate and rotate said hysteresis rotor;
- homopolar permanent magnetic flux means for providing a homopolar permanent magnetic flux for biasing said hysteresis rotor, said means configured such that a two-pole flux may be superimposed onto the homopolar permanent magnetic flux to generate suspension forces;
- and
- a multi-pole stator configured to provide a multi-pole stator-induced motor flux imposed upon said hysteresis rotor in addition to the two-pole suspension flux and the homopolar bias flux, said multi-polar stator arranged to generate torque by a hysteretic coupling between said hysteresis rotor and said multi-pole stator.
2 more elements
Dependencies are inferred from the claim text.