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Process for preparing magnet made of resin

  • US 5,145,614 A
  • Filed: 02/14/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 02/14/1990
  • Status: Expired due to Term
First Claim
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1. A process for preparing a multi-polar anisotropic resinous magnet by injecting a liquid reaction curable resin containing magnetic powder into a mold for molding and applying a magnetic field for multiple-pole orientation thereon, comprising:

  • (a) injecting said reaction curable resin into a mold for molding provided between a large number of magnetic poles arranged at predetermined intervals including magnetic poles with freely convertible magnetism and back yokes opposed to these magnetic poles;

    (b) permitting a magnetic flux to flow in one direction to the back yokes with the respective magnetic poles being made the same polarity, while maintaining the resin under uncured state injected in said magnetic flux, to localize and orient the magnetic powder in said resin corresponding to said magnetic flux; and

    (c) after completion of the step (b), completing the reaction curing of the resin while applying a magnetic field obtained by converting the magnetism of said magnetic poles to the desired multi-polar anisotropy of the resinous magnet, thereby to magnetize the magnetic powder within the resin corresponding to said magnetic field.

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