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US 4,761,527 AGranted
Magnetic flux induction heating
OwnerGlenn R. Mohrinventor
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OwnerGlenn R. Mohrinventor
Estimating the term…
This relates to the induction heating of metal shapes and coils of metal strip wherein the element to be heated functions as a shorted out armature of a D.C. generator. Either the metal shape to be heated or field forming magnets are moved relative to each other wherein the metal shape cuts the flux field to effect an induced generation of electricity within the shape. The frequency of the induced current is such wherein the electrical energy is induced into the metal shape on the order of one third of the thickness of that shape wherein a most efficient conduction of the heat from the electrical energy is effected with a minimum heat loss to the atmosphere. The voltage involved is low while there is a very high amperance. The frequency of the induced current will normally be on the order of one to ten hertz and less than sixty hertz. The relative movement between the field and the shape to be heated may be rotary or linear.
A method of magnetic flux induction heating an armature formed of strip shapes or the like, said method comprising the steps of forming a direct current generator including a direct current generator field and the armature, with the armature being a dead short and all electrical energy induced into the armature is directly converted into heat and effecting a pulsed induction of electrical energy into the armature at a frequency wherein there is a controlled depth of penetration of the armature by the induced electrical energy well beyond the surface of the armature wherein heat absorbed by the armature is primarily retained within the armature.
A new article of manufacture comprising a magnetic flux induction heating apparatus including a metal workpiece to be heated in the form of a short circuited armature, said armature being positioned relative to a D.C. field, and means for effecting a pulsing induction of the electrical energy of said D.C. field into the armature as direct current.
Dependencies are inferred from the claim text.