Demagnetization Correction Method by Using Inverse Analysis Considering Demagnetizing Field Distribution

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Abstract
A new demagnetization correction method is explained in this paper. Since a magnetization curve in an open magnetic circuit is considerably affected by the demagnetizing field which depends on the shape of the magnetic material, the demagnetization correction is significantly important to evaluate the magnetic properties of magnetic materials. In the new demagnetization correction method, a proper closed magnetic circuit curve is obtained in a way that a curve defined as a mathematical function is repeatedly modified in a computer feedback loop. In the method, the distribution of the demagnetizing field inside the magnetic material is taken into account by using finite element method in the computer calculation. Some calculation results are shown about Nd-Fe-B sintered magnets, and it is revealed that the new demagnetization correction method is able to reproduce the measured curves in the closed magnetic circuit with much higher accuracy than that of the classical demagnetization correction method.
Funding Information
  • Technology Research Association of Magnetic Materials for High-Efficiency Motors
  • New Energy and Industrial Technology Development Organization

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