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Method and apparatus for measuring core loss of a laminated ferromagnetic structure

  • US 4,573,012 A
  • Filed: 02/14/1983
  • Issued: 02/25/1986
  • Est. Priority Date: 02/14/1983
  • Status: Expired due to Fees
First Claim
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1. A tester for measuring electrical losses in a flux path of a ferromagnetic structure, said flux path having a predetermined cross-sectional area, comprising:

  • a first coil for coupling to said structure;

    means connectable to said first coil for driving an alternating current therethrough whereby a magnetic flux is produced in said flux path;

    a second coil for coupling to said structure and for producing a flux signal in response to said magnetic flux in said flux path;

    means connectable to said second coil for scaling said flux signal to produce a voltage related to a fixed value of flux density in said flux path and said predetermined cross-sectional area;

    first means connected with said scaling means for indicating said voltage scaled in units of area;

    means responsive to said alternating current for developing a first signal indicative of the amplitude thereof;

    means responsive to said flux signal for developing a second signal indicative of the magnitude thereof;

    means responsive to said first and second signals for multiplying said first signal by said second signal to produce a power loss signal;

    second means responsive to said power loss signal for indicating the power loss in said ferromagnetic structure; and

    means for adjusting said alternating current driving means to vary the amplitude of said alternating current until said first indicating means produces an indication equal to said predetermined cross-sectional area, whereby a condition for reading the power loss indication on said second indicating means is produced.

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