Insulated electromagnetic coil
AssigneeGeneral Electric Company
InventorRaymond J. Horrigan, deceased
Life of this patent
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Abstract
An electromagnet coil comprises a plurality of turns, including a pair of end turns having distal sections wrapped in first and second overlapping layers of fluorinated ethylene propylene (FEP) resin-coated polyimide tape. Conforming laminae of FEP resin-impregnated glass cloth are inserted between and bonded to adjacent turns of the coil. The entire coil is wrapped in at least two overlapping layers of the aforesaid tape, with the inner layer being bonded to the surface of the coil turns that it covers and the respectively adjoining layers of tape being bonded to each other. The resulting product has a thin, uniform coating of impervious electrical insulation characterized by improved heat transfer capability and improved stability at high temperatures.
Claims5
A helical electromagnetic coil comprising:
- a. a plurality of turns including a pair of end turns respectively disposed at opposite ends of the coil;
- b. said end turns having distal sections that are integrally joined, respectively, to a pair of terminal leads extending beyond the boundary of the coil to provide means for connecting the coil in an electrical circuit;
- c. first and second overlapping layers of fluorinated ethylene propylene resin-coated polyimide tape wrapped around the distal section of each end turn of said coil and around each of said terminal leads, said layers being bonded to one another and to said sections and said leads;
- d. a plurality of thin laminae of fluorinated ethylene propylene resin-impregnated glass cloth respectively disposed between and bonded to adjacent turns of said coil;
- e. an inner layer of said tape wrapped around the turns of said coil including a first portion but not all of the distal section of each end turn, said inner layer being bonded to the surface of the turns that it covers;
- and
- f. at least one additional layer of said tape wrapped around said coil so as to cover said inner layer and a second portion of the distal section of each end turn, said additional layer being bonded to said inner layer.
Dependencies are inferred from the claim text.