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US 11,637,467 B2Granted
Adhesive mixture including hard magnetic material for e-machine rotor
AssigneeFord Global Technologies, LLC
InventorsFranco Leonardi, Chuanbing Rong, Chun Tang, Wanfeng Li, Michael W. Degner
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Abstract
A rotor for an electric machine includes a core comprised of stacked laminations that define pockets between a hub portion and a pole portion. Each of the pockets are configured to receive magnetic material and define center cavities between regions of magnetic material to eliminate a flux leakage path between the magnetic materials. A cured mixture including an epoxy and a magnetic powder is disposed within the center cavities. The magnetic material may include sintered magnets and a cured mixture.
Claims6
A rotor for an electric machine comprising:
- a core comprised of stacked laminations that define a pocket between a hub portion and a pole portion;
- a first cured mixture filling a center region, defined as a predetermined distance normal from a centerline that bisects the pocket, of the pocket and including an adhesive and magnetic particles, having a first volume ratio defined by a volume of the magnetic particles to a volume of the adhesive;
- and
- a second cured mixture, filling a remaining volume of the pocket and including the adhesive and magnetic particles, having a second volume ratio, wherein the first volume ratio is a predetermined ratio that causes the first cured mixture to achieve a yield strength that is greater than a maximum radial stress caused by rotation of the rotor and an elastic deformation of the first cured mixture at the maximum radial stress is less than a predetermined radial deformation;
- and
- a rectangular magnet, having shorter sides and longer sides, disposed between the first and second cured mixtures such that the shorter sides border the first and second cured mixtures.
3 more elements
Dependencies are inferred from the claim text.