Electric heating – Metal heating – By arc
Patent
1977-01-21
1979-04-17
Truhe, J. V.
Electric heating
Metal heating
By arc
219121EM, 336 83, B23K 900, H01F 1502
Patent
active
041502787
ABSTRACT:
Beam machining methods are disclosed for adjusting the inductance of an inductive device having a core that substantially encloses coil means, and establishes a centrally located air gap. The inductance is adjusted by utilizing a high energy beam for machining a terminating end region of an inwardly extending core leg portion, the end face of which in part defines the air gap. By modifying the geometrical dimensions of the leg portion end face, the reluctance across the air gap may be readily changed by an amount that produces the desired value of inductance exhibited by the device when energized. The disclosed methods advantageously obviate the need for a tuning slug associated with the air gap, and eliminate the need for machine grinding the air gap-defining leg portions of the core prior to the assembly of the device.
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Bell Fred E.
Bergum K. R.
Miller R. P.
Truhe J. V.
Western Electric Company, Incorporated
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