Magnet orientation device and magnet

Patent metadata

Field	Value
Publication number	US-12548702-B2
Application number	US-202418591502-A
Country	US
Kind code	B2
Filing date	Feb 29, 2024
Priority date	Jul 4, 2023
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A magnet orientation device includes an upper plate disposed on a magnet raw material, a lower plate disposed below the magnet raw material, and dies disposed on sides of the magnet raw material. The upper plate has a convex upward arc shape. The upper plate includes a first magnetic region and a first non-magnetic region that surround the first magnetic region and the lower plate includes a second magnetic region and a second non-magnetic region that surround the second magnetic region. A lower surface of the first magnetic region provides a plurality of grooves and an upper surface of the second magnetic region provides a plurality of protrusions. A horizontal length of the first magnetic region is greater than a horizontal length of the magnet raw material and a horizontal length of the second magnetic region is equal to or less than the horizontal length of the magnet raw material.

First claim

What is claimed is:

1 . A magnet orientation device comprising:
an upper plate disposed on a magnet raw material and having a convex upward arc shape; a lower plate disposed below the magnet raw material; and a plurality of dies disposed at a first side and a second side of the magnet raw material, wherein the upper plate comprises a first magnetic region and a first non-magnetic region that surround the first magnetic region, wherein the lower plate comprises a second magnetic region and a second non-magnetic region that surround the second magnetic region, wherein a lower surface of the first magnetic region provides a plurality of concave upward grooves, wherein an upper surface of the second magnetic region provides a plurality of convex upward protrusions, wherein a horizontal length of the first magnetic region is greater than a horizontal length of the magnet raw material, and wherein a horizontal length of the second magnetic region is equal to or less than the horizontal length of the magnet raw material.

2 . The magnet orientation device of claim 1 , wherein a difference between the horizontal length of the magnet raw material and the horizontal length of the second magnetic region is greater than or equal to 0 and less than or equal to 2 millimeters (mm).

3 . The magnet orientation device of claim 2 , wherein the horizontal length of the magnet raw material is equal to the horizontal length of the second magnetic region.

4 . The magnet orientation device of claim 1 , wherein a difference between the horizontal length of the first magnetic region and the horizontal length of the magnet raw material is greater than or equal to 0.2 and less than or equal to 0.5 millimeter (mm).

5 . The magnet orientation device of claim 1 , wherein the first non-magnetic region protrudes downward from a center of the first non-magnetic region to a first side end and a second side end of the first non-magnetic region, and
wherein the second non-magnetic region protrudes upward from a first side end and a second side end of the second non-magnetic region to a center of the second non-magnetic region.

6 . The magnet orientation device of claim 1 , wherein each of the plurality of concave upward grooves and the plurality of convex upward protrusions is a curvature.

7 . A magnet orientation device comprising:
an upper plate disposed on a magnet raw material and having a convex upward arc shape; a lower plate disposed below the magnet raw material; and a plurality of dies disposed at a first side and a second side of the magnet raw material, wherein the upper plate comprises a first magnetic region and a first non-magnetic region that surround the first magnetic region, wherein the lower plate comprises a second magnetic region and a second non-magnetic region that surround the second magnetic region, wherein a lower surface of the first magnetic region provides a plurality of concave upward grooves, wherein an upper surface of the second magnetic region provides a plurality of convex upward protrusions, wherein each of the plurality of concave upward grooves and the plurality of convex upward protrusions includes a curvature, wherein, among the plurality of concave upward grooves, a shape of concave upward grooves adjacent to a first side end and a second side end of the first magnetic region is different from a shape of the other concave upward grooves, and wherein, among the plurality of convex upward protrusions, a shape of convex upward protrusions adjacent to a first side end and a second side end of the second magnetic region is different from a shape of the other convex upward protrusions.

8 . The magnet orientation device of claim 7 , wherein, among the plurality of concave upward grooves, the concave upward grooves adjacent to the side ends of the first magnetic region each includes a plurality of curvatures and the other grooves each includes a single curvature.

9 . The magnet orientation device of claim 8 , wherein, among the plurality of concave upward grooves, the concave upward grooves adjacent to the side ends of the first magnetic region each includes a first curvature and the other concave upward grooves each includes a second curvature that is different from the first curvature.

10 . The magnet orientation device of claim 9 , wherein a radius of the first curvature is greater than a radius of the second curvature.

11 . The magnet orientation device of claim 10 , wherein a value obtained by dividing the first curvature by the second curvature is between 1 and 1.2.

12 . The magnet orientation device of claim 7 , wherein, among the plurality of convex upward protrusions, the convex upward protrusions adjacent to the side ends of the second magnetic region each includes a plurality of curvatures, and the other convex upward protrusions each includes a single curvature.

13 . The magnet orientation device of claim 12 , wherein, among the plurality of convex upward protrusions, the convex upward protrusions adjacent to the side ends of the second magnetic region each includes a third curvature, and the other convex upward protrusions each includes a fourth curvature that is different from the third curvature.

14 . The magnet orientation device of claim 13 , wherein a radius of the third curvature is greater than a radius of the fourth curvature.

15 . The magnet orientation device of claim 14 , wherein a value obtained by dividing the third curvature by the fourth curvature is between 1 and 1.25.

16 . The magnet orientation device of claim 7 , wherein the first non-magnetic region protrudes downward from a center of the first non-magnetic region to the side ends of the first non-magnetic region, and
wherein the second non-magnetic region protrudes upward from the side ends of the second non-magnetic region to a center of the second non-magnetic region.

17 . The magnet orientation device of claim 7 , wherein a horizontal length of the first magnetic region is greater than a horizontal length of the magnet raw material.

18 . The magnet orientation device of claim 7 , wherein a horizontal length of the second magnetic region is equal to or less than a horizontal length of the magnet raw material.

19 . A magnet comprising:
a magnet orientation device comprising:
an upper plate disposed on a magnet raw material and having a convex upward arc shape;
a lower plate disposed below the magnet raw material; and
a plurality of dies disposed at a first side and a second side of the magnet raw material,
wherein the upper plate comprises a first magnetic region and a first non-magnetic region that surround the first magnetic region,
wherein the lower plate comprises a second magnetic region and a second non-magnetic region that surround the second magnetic region,
wherein a lower surface of the first magnetic region provides a plurality of concave upward grooves,
wherein an upper surface of the second magnetic region provides a plurality of convex upward protrusions,
wherein a horizontal length of the first magnetic region is greater than a horizontal length of the magnet raw material, and
wherein a horizontal length of the second magnetic region is equal to or less than the horizontal length of the magnet raw material.

20 . The magnet of claim 19 , wherein a difference between the horizontal length of the magnet raw material and the horizontal length of the second magnetic region is greater than or equal to 0 and less than or equal to 2 millimeters (mm).

Assignees

• Lg Electronics Inc

Inventors

• Jeong Gyujong
• Eum Sangjoon
• Park Songe
• Cho Jeonghyun
• Ha Kyungho

Classifications

• H01F7/02

  Permanent magnets {[PM]} · CPC title

• D06F37/304

  Arrangements or adaptations of electric motors · CPC title

• D06F37/206

  Mounting of motor · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K1/27915

  Magnets shaped to vary the mechanical air gap between the magnets and the stator · CPC title