Rotor for an electrical machine
AssigneeFord Global Technologies, LLC
InventorsFeng Liang, John Michael Miller, Xingyi Xu
Life of this patent
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Abstract
A "claw pole" or Lundell rotor has permanent magnets included therein, each permanent magnet disposed between an adjacent pair of pole fingers. The permanent magnets each have a magnetization polarity at an angle between radial and tangential with respect to the axis of rotation of the rotor.
Claims20
A rotor for an electrical machine, said rotor having an axis of rotation and comprising:
- a first pole piece having a plurality of axially-extending first pole fingers;
- a second pole piece having a plurality of axially-extending second pole fingers, said first pole fingers alternately intermeshed with said second pole fingers;
- a field coil in electromagnetic communication with said first pole piece and said second pole piece which when energized magnetizes said first pole fingers and said second pole fingers;
- a plurality of permanent magnets, each disposed between a first pole finger and an adjacent second pole finger and having a radially-outward surface and an adjacent tangentially-facing surface of a first magnetic polarity and having a radially-inward surface and an adjacent tangentially-facing surface of an opposite magnetic polarity.
A rotor for an electrical machine, said rotor having an axis of rotation and comprising:
- a first pole piece having a plurality of axially-extending first pole fingers;
- a second pole piece having a plurality of axially-extending second pole fingers, said first pole fingers alternately intermeshed with said second pole fingers;
- a field coil in electromagnetic communication with said first pole piece and said second pole piece which when energized magnetizes said first pole fingers and said second pole fingers;
- a plurality of permanent magnets, each disposed between a first pole finger and an adjacent second pole finger and having a magnetization polarity at an angle between radial direction and tangential direction with respect to said axis of rotation, but not including a radial angle or tangential angle.
A method of manufacturing a rotor for an electrical machine, said rotor having a first pole piece with a plurality of first axially-extending pole fingers and a second pole piece with a plurality of second axially-extending pole fingers and an axis of rotation, said method comprising:
- assembling said first pole piece and said second pole piece with said first pole fingers alternately intermeshed with said second pole fingers and at least one permanent magnet disposed between each first pole finger and an adjacent second pole finger;
- magnetizing said permanent magnets to each have a magnetization polarity with an angle between radial direction and tangential direction with respect to said axis of rotation, but not including a radial angle or tangential angle.
Dependencies are inferred from the claim text.