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US 6,603,230 B1Granted
Active magnetic bearing assembly using permanent magnet biased homopolar and reluctance centering effects
AssigneeHoneywell International Inc.
InventorStephen G. Abel
Life of this patent
Estimating the term…
Abstract
An active magnetic bearing assembly includes at least two rotors and two stator assemblies each having two pole faces. The pole faces of the stator assemblies are axially offset from the pole faces of their associated rotors. Thus, axial control of a shaft that is rotationally mounted using the active magnetic bearing assembly is provided by a reluctance centering force.
Claims28
An active magnetic bearing assembly for rotationally mounting a shaft in a non-contact manner, the bearing assembly comprising:
- a first bearing rotor having at least a first pole and a second pole face;
- a first stator assembly spaced radially outwardly of the first bearing rotor and having at least a first pole face and a second pole face that are axially offset from the first bearing rotor first pole face and second pole face, respectively, by a first predetermined distance in a first direction;
- a second bearing rotor having at least a first pole face and a second pole face;
- and
- a second stator assembly spaced radially outwardly of the second bearing rotor and having at least a first pole face and a second pole face that are axially offset from the second bearing rotor first pole face and second pole face, respectively, by a second predetermined distance in a second direction that is opposite the first direction,
- wherein the first and second stator assemblies each comprise:
- a first stator body including at least one coil wound pole having the first pole face,
- a second stator body including at least one coil wound pole having the second pole face, and
- an axially polarized permanent magnet disposed between, and coupling together, the first and the second stator bodies.
6 more elements
An energy storage flywheel assembly, comprising:
- a shaft;
- a flywheel coupled to the shaft;
- and
- an active magnetic bearing assembly for rotationally mounting the shaft in non-contact manner, the magnetic bearing assembly comprising:
- a first bearing rotor having at least a first pole face and a second pole face;
- a first stator assembly spaced radially outwardly of the first bearing rotor and having at least a first pole face and a second pole face that are axially offset from the first bearing rotor first pole face and second pole face, respectively, by a first predetermined distance in a first direction;
- a second bearing rotor having at least a first pole face and a second pole face;
- and
- a second stator assembly spaced radially outwardly of the second bearing rotor and having at least a first pole face and a second pole face that are axially offset from the second bearing rotor first pole face and second pole face, respectively, by a second predetermined distance in a second direction that is opposite the first direction,
- wherein the first and second stator assemblies each comprise:
- a first stator body including at least one coil wound pole having the first pole face,
- a second stator body including at least one coil wound pole having the second pole face, and
- an axially polarized permanent magnet disposed between, and coupling together, the first and the second stator bodies.
10 more elements
An apparatus for imparting motion to a shaft, comprising:
- a shaft;
- a rotational motion imparting device coupled to the shaft;
- and
- an active magnetic bearing assembly for rotationally mounting the shaft in non-contact manner, the magnetic bearing assembly comprising:
- a first bearing rotor having at least a first pole face and a second pole face;
- a first stator assembly spaced radially outwardly of the first bearing rotor and having at least a first pole face and a second pole face that are axially offset from the first bearing rotor first pole face and second pole face, respectively, by a first predetermined distance in a first direction;
- a second bearing rotor having at least a first pole face and a second pole face;
- and
- a second stator assembly spaced radially outwardly of the second bearing rotor and having at least a first pole face and a second pole face that are axially offset from the second bearing rotor first pole face and second pole face, respectively, by a second predetermined distance in a second direction that is opposite the first direction,
- wherein the first and second stator assemblies each comprise:
- a first stator body including at least one coil wound pole having the first pole face,
- a second stator body including at least one coil wound pole having the second pole face, and
- an axially polarized permanent magnet disposed between, and
- coupling together, the first and the second stator bodies.
11 more elements
A satellite, comprising:
- a housing;
- at least one component having a shaft, the component positioned within the housing;
- and
- an active magnetic bearing assembly for rotationally mounting the shaft in a non-contact manner, the bearing assembly comprising:
- a first bearing rotor having at least a first pole face and a second pole face;
- a first stator assembly spaced radially outwardly of the first bearing rotor and having at least a first pole face and a second pole face that are axially offset from the first bearing rotor first pole face and second pole face, respectively, by a first predetermined distance in a first direction;
- a second bearing rotor having at least a first pole face and a second pole face;
- and
- a second stator assembly spaced radially outwardly of the second bearing rotor and having at least a first pole face and a second pole face that are axially offset from the second bearing rotor first pole face and second pole face, respectively, by a second predetermined distance in a second direction that is opposite the first direction,
- wherein the first and second stator assemblies each comprise:
- a first stator body including at least one coil wound pole having the first pole face,
- a second stator body including at least one coil wound pole having the second pole face, and
- an axially polarized permanent magnet disposed between, and coupling together, the first and the second stator bodies.
10 more elements
Dependencies are inferred from the claim text.