Method of manufacturing laminated polar anisotropic hybrid magnet
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United States of America Patent
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Feb 12, 2008
Grant Date -
Feb 17, 2005
app pub date -
Apr 28, 2004
filing date -
Aug 13, 2003
priority date (Note) -
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Abstract
Disclosed is a method of manufacturing a laminated polar anisotropic hybrid magnet, which includes separately mixing first permanent magnet powders having low magnetic properties and second permanent magnet powders having high magnetic properties with a thermoplastic resin to prepare first and second compound pellets, respectively, and firstly injecting the first compound pellets by use of a first injection mold, to prepare a polar anisotropic and anisotropic resin magnet, which is then placed into a second injection mold having an outer diameter lager than that of the first mold, followed by secondly injecting in a magnetic field together with the second compound pellets. The manufacturing method of the current invention is advantageous in terms of exhibition of higher magnetic properties of the laminated polar anisotropic hybrid magnet, and reduction of the use of expensive materials, thus generating economic benefits. Further, a flux density wave of the magnet can be easily controlled on the magnet surface to be suitable for performances and characteristics of the motors, and temperature properties of the magnet can be enhanced. Thereby, the entire manufacturing method can be efficiently carried out, therefore increasing productivity and reliability in practical use thereof.
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