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US 4,289,946 AGranted
Electromagnetic casting apparatus
AssigneeOlin Corporation
InventorsJohn C. Yarwood, Ik Y. Yun, Derek E. Tyler, Peter J. Kindlmann
Life of this patent
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Abstract
An apparatus for casting metals wherein the molten metal is contained and formed into a desired shape by the application of an electromagnetic field. A control system is utilized to minimize variations in the gap between the molten metal and an inductor which applies the magnetic field. The gap or an electrical parameter related thereto is sensed and used to control the current to the inductor.
Claims13
In an apparatus for casting materials such as metals comprising:
- induction means for applying a magnetic field to said material and solid state inverter means for applying an alternating current to said induction means to generate said magnetic field the improvement wherein:
- means are provided for sensing a reactive parameter corresponding about to the reactance or inductance of said induction means, said reactive parameter sensing means comprising:
- means for sensing a voltage signal applied to said induction means;
- means for sensing a current signal applied to said induction means;
- circuit means for filtering said voltage and current signals to extract the fundamental frequency thereof;
- and
- circuit means receiving said filtered voltage and current signals for generating a signal corresponding about to said reactance or inductance of said induction means.
4 more elements
In an apparatus for casting materials such as metals comprising:
- induction means for applying a magnetic field to said material and means for applying an alternating current to said induction means to generate said magnetic field;
- the improvement wherein said apparatus further includes:
- means for sensing the voltage applied to said induction means 90.degree. out of phase to the current applied to said induction means and for generating a phase sensitive voltage signal corresponding thereto;
- means for sensing the current applied to said induction means for generating a voltage signal corresponding thereto;
- and
- divider circuit means for dividing said phase sensitive voltage signal by said voltage signal corresponding to said current for generating a signal corresponding about to the reactance of said induction means.
3 more elements
Dependencies are inferred from the claim text.