Electric heating – Heating devices – With heating unit structure
Patent
1984-10-30
1988-05-17
Albritton, C. L.
Electric heating
Heating devices
With heating unit structure
219 1075, 219 1079, 219229, H05B 310
Patent
active
047452641
ABSTRACT:
The impedance of an autoregulating heater is greatly increased by employing in one embodiment a return conductor in the form of a helix surrounded by and insulated from a magnetic conductor; the two conductors connected in series or as a transformer across an a.c. source whereby the current in the magnetic material is forced to follow a helical path. In a preferred embodiment, a multilayered coil is wrapped about and insulated from a magnetic sleeve disposed about a copper rod; the sleeve and rod forming the secondary of a transformer. The helical path of the current in the secondary plus the impedance transformation effect of the transformer greatly enhances the impedance of the load as presented to a current source. The winding is enclosed within another magnetic sleeve which provides another magnetic shield about the heater and if connected at one end to the inner magnetic layer increases the width to thickness ratio for purposes to be described.
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"New Method of Preventing Ice Formation on Exposed Power Conductors", Toms et al, Proc., IEE, vol. 112, No. 11, Nov. 1965, p. 2,125.
Albritton C. L.
Metcal Inc.
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