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Side entry coil induction heater with flux concentrator

  • US 5,630,958 A
  • Filed: 01/27/1995
  • Issued: 05/20/1997
  • Est. Priority Date: 01/27/1995
  • Status: Expired due to Term
First Claim
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1. An induction heating apparatus, for heating a portion of a load containing a thermally responsive material, said induction heating apparatus comprising:

  • a coil including an opening such that the load may be inserted laterally into said opening with the portion of the load to be heated disposed within an area formed by said coil;

    said coil generating a magnetic field when driven by an electric current through said coil, wherein the direction of the magnetic field is substantially transverse to the axis of the opening in a region surrounding and extending outwardly from at least a portion of the portion of the load to be heated;

    a flux concentrator member movable between a heating position disposed along said opening and located in said region where said magnetic field is substantially transverse to the axis of the opening and a loading position removed from the opening of the coil, said flux concentrator member having a high magnetic permeability so as to thereby enhance the uniformity of the magnetic field generated within said coil; and

    power supply means connected to said coil for driving alternating current through said coil, such that induction heating of the portion of the load to be heated is produced by the magnetic field generated by the current.

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