Multi-wire induction heating

Details Multi-wire induction heating Multi-wire induction heating

1987-12-29

1988-11-29

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 1079, H05B 500

Patent

active

047883944

ABSTRACT:
In the induction heating of thin (e.g. 0.5 to 3 mm diameter) steel wires (W) in continuous heating processes, relatively low field strengths of e.g. up to 20,000 Am.sup.-1 are employed but are chosen so as to set the relative magnetic permeability .mu.r at 40 or more. The wire are passed through coil blocks (1), which are wound flat around a row of ceramic tubes (3) to guide and insulate the wires. The coil blocks are energized at frequencies typically up to 30 kHz. The direction of winding and/or the phase of the current is changed between adjacent coil blocks (1), or groups of blocks, to reduce voltage build-up along the wires.

REFERENCES:
patent: 1980875 (1934-11-01), Northrup
patent: 2385031 (1945-09-01), Schneider et al.
patent: 2675461 (1954-03-01), Leonard
patent: 3041434 (1962-06-01), Alf
patent: 3574005 (1971-04-01), Rudd
patent: 4086462 (1978-04-01), Scheffler et al.
patent: 4118617 (1978-10-01), Moreau
"Induction Heating Handbook"--J. Davies, P. Simpson, McGraw-Hill, U.K. 1979.

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