Demagnetizing method

Details Demagnetizing method Demagnetizing method

2008-02-20

2008-11-25

Barrera, Ramon M (Department: 2832)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

Reexamination Certificate

active

07457095

ABSTRACT:
A method is presented for demagnetizing ferromagnetic components in an alternating field of an externally excited electrical series resonant circuit. A supply voltage having an excitation frequency (f) is applied in parallel to a demagnetization coil having a no-load inductance of the series resonant circuit, because of which an alternating current (I) flows through the series resonant circuit (1), which generates a magnetic alternating field. In the event of suitable selection of the excitation frequency (f) in such a way that the product of the excitation frequency (f) in Hz multiplied by the no-load inductance (L0) in Henry is f*L0≧0,22 Hz*H, the excitation frequency is in an operating range (5) and the series resonant circuit (1) may be used without further regulation technology to demagnetize components which are led through the inner chamber of the demagnetization coil (2) and form a fill level. If the excitation frequency (f) is selected accordingly, continuous operation is possible, in which the resonant frequency (fR) of the series resonant circuit (2) is not reached even at a high fill level.

REFERENCES:
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patent: 7196894 (2007-03-01), Maurer et al.
patent: 2007/0133142 (2007-06-01), Meyer
patent: 30 05 927 (1981-09-01), None
patent: 1 796 113 (2007-06-01), None

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