| 摘要 |
To demagnetize a magnetic material, the material is positioned within a field of magnetic flux generated by an electrical induction coil having applied thereto a constant amplitude, alternating voltage wave, the half cycles of which alternate in polarity and successively and incrementally increase in frequency. The flux alternates in polarity with the polarity of the voltage wave, and the magnitude, or strength, of the flux is in accordance with the current flow through the coil, or is inversely in accordance with the impedance of the coil. As the frequency of the voltage wave incrementally increases from an initial low value to a higher value, the magnitude of the magnetic flux incrementally decreases from an initial high value to a lower value, and the alternating polarity, decreasing magnitude magnetic flux effectively demagnetizes the magnetic material. The invention finds utility in demagnetizing magnetic material cores of magnetic operating coils.
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