Method of fabrication of a curvilinear magnet

Patent metadata

Field	Value
Publication number	US-10665387-B2
Application number	US-201615150760-A
Country	US
Kind code	B2
Filing date	May 10, 2016
Priority date	May 10, 2016
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

A method of fabricating a curvilinear magnet includes forming at least one slot in a material billet. The slotted material billet is inserted into a mold having a curvilinear pocket. The mold is closed around the slotted material billet such that the slotted material billet conforms to the curvilinear pocket and forms a curvilinear billet. The curvilinear billet is arranged in a structure. The curvilinear billet arranged in the structure is then magnetized.

First claim

What is claimed is:

1. A method of fabricating a curvilinear magnet comprising:
forming at least one slot along a length of a material billet;
inserting the material billet having the at least one slot into a mold having a first tool and a second tool, the first tool having a curvilinear pocket, the second tool having a curvilinear shape, and the material billet being disposed between the first tool and the second tool with the at least one slot facing the curvilinear pocket of the first tool;
closing the first tool and the second tool of the mold around the material billet such that the material billet having the at least one slot bends and conforms to the curvilinear pocket of the first tool and the curvilinear shape of the second tool to form a curvilinear billet;
removing the curvilinear billet from the mold;
arranging the curvilinear billet in a structure; and
magnetizing the curvilinear billet arranged in the structure.

2. The method of fabricating a curvilinear magnet of claim 1 , further comprising:
providing a binder to the curvilinear billet in the structure after the curvilinear billet has been removed from the mold to secure the curvilinear billet to the structure.

3. The method of fabricating a curvilinear magnet of claim 1 , wherein the structure is a rotor of a permanent magnet machine.

4. The method of fabricating a curvilinear magnet of claim 1 , wherein the material billet comprises a ferromagnetic material.

5. The method of fabricating a curvilinear magnet of claim 1 , wherein the material billet comprises a ductile material.

6. The method of fabricating a curvilinear magnet of claim 1 , wherein the at least one slot comprises at least one straight cut slot.

7. The method of fabricating a curvilinear magnet of claim 1 , wherein the at least one slot comprises at least one wedge-shaped cut slot.

8. The method of fabricating a curvilinear magnet of claim 1 , wherein the at least one slot in the material billet defines a plurality of material segments.

9. The method of fabricating a curvilinear magnet of claim 8 , wherein a direction of magnetization of each of the plurality of material segments is defined by a spatial distribution of a magnetizing field during the magnetization.

10. The method of fabricating a curvilinear magnet of claim 1 , wherein the magnetization is performed with a steady-state magnetizer.

11. The method of fabricating a curvilinear magnet of claim 1 , wherein the magnetization is performed with an impulse-type magnetizer.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Balogh Michael P
• Pinkerton Frederick E
• Bika Anil Singh
• Rousseau Ingrid A

Classifications

• H01F13/003

  Methods and devices for magnetising permanent magnets (permanent magnets H01F7/02) · CPC title

• H01F41/0266 Primary

  Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title

• Y10T29/49012

  Rotor · CPC title

• B21D11/10

  Bending specially adapted to produce specific articles, e.g. leaf springs {(making or bending leaf springs B21D53/886)} · CPC title

• H02K15/03

  having permanent magnets · CPC title