Permanent magnet rotor with enhanced demagnetization protection
AssigneeFord Global Technologies, LLC
InventorsFeng Liang, Lusu Guo, Michael W. Degner, Wei Wu, Chun Tang
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Abstract
A permanent magnet machine includes a rotor and an irregular polyhedron shaped magnet assembly. The rotor may define at least one magnet opening and may be configured to rotate within a circular opening defined by a stator. The irregular polyhedron shaped magnet assembly may be disposed in the magnet opening and may define a magnetization direction, wherein a height along the magnetization direction and perpendicular with a lamination plane of the rotor is greater at both ends than at a central portion disposed therebetween.
Claims20
A permanent magnet machine comprising:
- a rotor defining at least one magnet opening and configured to rotate within a circular opening defined by a stator;
- and
- an irregular polyhedron shaped magnet assembly disposed in the magnet opening and defining a magnetization direction, wherein a height along the magnetization direction and perpendicular with a lamination plane of the rotor is greater at both ends than at a central portion disposed therebetween.
A permanent magnet machine comprising:
- a rotor defining at least one magnet opening;
- and
- an irregular polyhedron shaped magnet assembly disposed in the magnet opening, having a magnetization direction, and having a cross sectional area that is greater at outer surfaces along an axis perpendicular to the magnetization direction and parallel with a lamination plane of the rotor than at a central portion disposed between the outer surfaces.
A permanent magnet machine comprising:
- a rotor defining at least one magnet opening and configured to rotate within a circular opening defined by a stator;
- and
- an irregular polyhedron shaped magnet assembly, disposed in the magnet opening, defining an axis perpendicular to a magnetization direction of the magnet assembly and parallel with rotor laminations, and having coercivity that varies along the axis.
Dependencies are inferred from the claim text.