Compression-molding method and device for permanent magnet

A compression-molding device for a permanent magnet, comprising a drive coil, a compression tool, a mold, and an orientation coil,

• wherein a groove configured to be filled with magnetic powder under compression is provided at a center of the mold, and a bottom of the compression tool contacts the magnetic powder under compression, a top of the compression tool contacts an end of the drive coil, and the compression tool coincides with a central axis of the groove,
• wherein the drive coil is configured to generate an electromagnetic force, so as to drive the compression tool to apply a molding compression force to the magnetic powder under compression,
• the orientation coil is sleeved on an outer periphery of the mold to generate an orientation magnetic field,
• wherein the drive coil generates the electromagnetic force when a transient current is passed into the drive coil, so as to apply a molding compression force to the magnetic powder under compression, and the orientation coil generates the orientation magnetic field when the transient current is passed into the orientation coil, thereby providing the magnetic powder under compression with an anisotropic property, and
• wherein the transient currents synchronously pass 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.