US 11,756,729 B2
Compression-molding method and device for permanent magnet
Liang Li, Hubei (CN); and Yiliang Lv, Hubei (CN)
Assigned to HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hubei (CN)
Appl. No. 17/434,415
Filed by HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hubei (CN)
PCT Filed Dec. 3, 2020, PCT No. PCT/CN2020/133576
§ 371(c)(1), (2) Date Aug. 27, 2021,
PCT Pub. No. WO2021/238134, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 202010448125.6 (CN), filed on May 25, 2020.
Prior Publication US 2022/0344097 A1, Oct. 27, 2022
Int. Cl. H01F 41/02 (2006.01); B22F 3/087 (2006.01); B22F 3/00 (2021.01)
CPC H01F 41/0266 (2013.01) [B22F 3/003 (2013.01); B22F 3/087 (2013.01); B22F 2202/05 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A compression-molding method for a permanent magnet, comprising:
providing a drive coil to generate an electromagnetic force when a transient current is passed into the drive coil, so as to apply a molding compression force to magnetic powder under compression, and providing an orientation coil to generate an orientation magnetic field when a transient current is passed into the orientation coil, thereby providing the magnetic powder under compression with an anisotropic property; and
synchronously passing the transient currents to the drive coil and the orientation coil to synchronously generate the electromagnetic force and the orientation magnetic field, thereby completing compression-molding of the permanent magnet, wherein a magnitude of the electromagnetic force and an intensity of the orientation magnetic field are respectively changed by changing peak values of the transient currents.