Title:
PRESS FORMING METHOD AND APPARATUS FOR PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2021/238134
Kind Code:
A1
Abstract:
A press forming method for a permanent magnet, comprising: providing drive coils (1, 2), the drive coils (1, 2) being made to generate an electromagnetic force when a transient current is passed in the drive coils (1, 2), so as to apply a formation press force to magnetic powder to be pressed (6); providing an orientation coil (5), the orientation coil (5) being made to generate an orientation magnetic field when the transient current is passed in the orientation coil (5) such that the magnetic powder to be pressed (6) is anisotropic; and synchronously passing the transient current in the drive coils (1, 2) and the orientation coli (5) to synchronously generate an electromagnetic force and an orientation magnetic field to complete press forming of a permanent magnet, wherein the magnitude of the electromagnetic force and the intensity of the orientation magnetic field are respectively changed by changing a peak of the transient current. A transient coil is used to generate an orientation magnetic field which can be extremely high to improve magnetic properties of a permanent magnet, and to generate an electromagnetic force to press magnetic powder to improve the density of a permanent magnet. The method features a short press time, solves the problems in the prior art of a large volume of an electromagnet and incapability of further improving the intensity of an orientation magnetic field, and thus is highly applicable.
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Inventors:
LI LIANG (CN)
LV YILIANG (CN)
WU TIAN (CN)
LV YILIANG (CN)
WU TIAN (CN)
Application Number:
PCT/CN2020/133576
Publication Date:
December 02, 2021
Filing Date:
December 03, 2020
Export Citation:
Assignee:
UNIV HUAZHONG SCIENCE TECH (CN)
International Classes:
H01F13/00; H01F41/02
Foreign References:
| CN111640552A | 2020-09-08 | |||
| CN201707998U | 2011-01-12 | |||
| CN103846431A | 2014-06-11 | |||
| CN103111618A | 2013-05-22 | |||
| CN103042211A | 2013-04-17 | |||
| US20170062106A1 | 2017-03-02 |
Attorney, Agent or Firm:
WUHAN HUAZHIYU INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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