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US 2026/0120945 A1Published application
Magnet and method of making magnets for an electric machine
AssigneeFord Global Technologies, LLC
InventorsWanfeng Li, Chuanbing Rong, Michael W. Degner
Life of this patent
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Abstract
A method for forming magnets includes compacting particles of a metallic powder to form a magnet with homogeneous coercivity. The method further includes thermal gradient annealing the magnet to selectively promote grain growth within the magnet such that grain size of the magnet decreases in a direction of a temperature gradient corresponding to regions of lower temperature.
Claims20
A method for forming magnets comprising:
- compacting particles of a metallic powder to form a magnet with homogeneous coercivity;
- and
- thermal gradient annealing the magnet to selectively promote grain growth within the magnet such that grain size of the magnet decreases in a direction of a temperature gradient corresponding to regions of lower temperature and the coercivity increases in the direction.
A method for forming magnets comprising:
- compacting particles of a metallic powder to form a magnet with homogeneous coercivity;
- deforming the magnet within a die via a press to form the magnet into a shape;
- and
- controlling a temperature of the die, the press, or the magnet to generate a temperature gradient across the magnet to thermal gradient anneal the magnet and selectively promote grain growth within the magnet such that grain size of the magnet decreases in a direction of the temperature gradient corresponding to regions of lower temperature and the coercivity increases in the direction.
1 more element
A magnet comprising:
- an array of grains extending from a first end of the magnet toward a second end of the magnet, the grains within the array having aligned magnetic polarities and grain sizes that decrease along a first direction extending from the first end toward the second end such that a coercivity of the magnet increases in the first direction.
Dependencies are inferred from the claim text.