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Generators or Motors

Axial-gap-motor-generator-for-high-speed-operation

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Axial gap motor-generator for high speed operation

Details

Inventors: Swett, Dwight W.;
Assignee:
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Addison; Karen
Attorney, Agent or Firm: Sullivan Law Group

An axial gap motor-generator of the type coupled to a shaft having an axis of rotation. The motor-generator comprises a rotor having a rotor body rotatably disposed about the shaft and having an outer region. The rotor includes a plurality of openings disposed in the outer region and spaced from one another. Each of the openings includes an outer edge. The motor-generator also includes a plurality of magnets equal in number to the openings. Each of the magnets includes an outer edge corresponding to the outer edge of a corresponding one of the openings. The outer edge of the magnets generally is non-conformal to and is slightly smaller than the outer edge of the openings, and each of the magnets is shaped to be inserted into the corresponding one of the openings. The motor-generator further includes a stator assembly positioned adjacent to the rotor. The stator assembly includes windings positioned to be adjacent to the magnets when the rotor is rotated. The outer edge of each of the magnets is dimensioned to substantially conform to the outer edge of the corresponding one of the openings when the axial gap motor-generator is operated at the operational speed and the outer edge of the corresponding one of the openings is thereby deformed. The motor-generator further includes a backiron assembly that is adapted to conform to the rotor when the rotor is operated at its operational state. A vibration isolator also is provided for isolating vibrations of the motor-generator from the shaft. Related methods also are provided.

DETAILED DESCRIPTION To achieve the foregoing objects, and in accordance with the purposes of the invention as embodied and broadly described in this document, an axial gap motor-generator is provided, of the type coupled to a shaft having an axis of rotation.
The motor-generator comprises a rotor having a rotor body rotatably disposed about the shaft and having an outer region.
The rotor includes a plurality of openings disposed in the outer region and spaced from one another.
Each of the openings includes an outer edge, and preferably but optionally an inner edge and a pair of side edges.
The motor-generator also includes a plurality of magnets equal in number to the openings.
Each of the magnets includes an outer edge, and preferably but optionally an inner edge and a pair of side edges corresponding respectively to the inner edge, the outer edge, and the pair of side edges of a corresponding one of the openings.
The outer edge of the magnets generally is non-conformal to and is slightly smaller than the outer edge of the corresponding one of the openings.
Each of the magnets is shaped to be inserted into the corresponding one of the openings.
A stator assembly is positioned adjacent to the rotor.
The stator assembly includes windings positioned to be adjacent to the magnets when the rotor is rotated.
Preferably, the axial gap motor-generator according to this aspect of the invention further includes an expandable hub between the rotor and the shaft.
The rotor also may include a rim around the outer region.
The rim may comprise, for example, a composite material.
The outer edge of each of the openings preferably has a first resting radius when the axial gap motor-generator is at rest, and the outer edge of each of the magnets has a second resting radius when the axial gap motor-generator is at rest, wherein the first resting radius is larger than the second resting radius.
In the presently preferred embodiment according to this aspect of the invention, the second resting radius is about 80% of the first resting radius

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