Permanent magnet rotor with enhanced demagnetization protection
AssigneeFord Global Technologies, LLC
InventorsFeng Liang, Lusu Guo, Michael W. Degner, Wei Wu, Chun Tang
Life of this patent
Estimating the term…
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.
Claims16
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, the irregular polyhedron shaped magnet assembly including a pair of identical frustum-shaped magnets that are joined at their apexes to form a bifrustum having a bowtie-shaped cross section, 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 configured to rotate within a circular opening defined by a stator;
- and
- a quadrilateral magnet assembly disposed in the magnet opening and including a pair of first and second magnets, the first magnet having a cross section with three straight sides and a first curvilinear side, the second magnet having two straight sides and a second curvilinear side extending between the two straight sides, wherein the first and second curvilinear sides match and nest with each other to join the first and second magnets into the quadrilateral magnet assembly that has a rectangular cross section.
A rotor comprising:
- an irregular polyhedron shaped magnet assembly defining a magnetization direction, the irregular polyhedron shaped magnet assembly including a pair of identical frustum-shaped magnets that are joined at their apexes to form a bifrustum having a bowtie-shaped cross section, 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.
Dependencies are inferred from the claim text.