Patent ID: 7328500
Filing Date: 2008-02-12
Classification: H01F,Y10T

Abstract:
1. A method of manufacturing a laminated polar anisotropic hybrid magnet, comprising: mixing at least one first permanent magnet powder having first magnetic properties with a thermoplastic resin to prepare first compound pellets having magnetic properties, and mixing at least one second permanent magnet powder having magnetic properties which are higher than said first magnetic properties with a thermoplastic resin to prepare second compound pellets having high magnetic properties which are higher than said magnetic properties of said first compound pellets; injection molding the first compound pellets by use of a first polar anisotropic and anisotropic mold having multi-poles and multi-cavities, to prepare a polar anisotropic and anisotropic resin magnet; and placing the polar anisotropic and anisotropic resin magnet into a second polar anisotropic mold having an outer diameter larger than that of said first polar anisotropic and anisotropic mold used for the firstly injection molding, thereby leaving a space between said polar anisotropic and anisotropic resin magnet and said second mold, injection molding in a magnetic field the second compound pellets into said space to manufacture a laminated polar anisotropic hybrid magnet with multi-poles and multi-layers.