Method of making an excitation coil for an electrodeless high in

Details Method of making an excitation coil for an electrodeless high in Method of making an excitation coil for an electrodeless high in

1990-07-19

1991-08-27

Ramsey, Kenneth J.

Metal working

Method of mechanical manufacture

Electrical device making

315248, 228160, H05B 1510, H05B 4110

Patent

active

050421395

ABSTRACT:
An excitation coil for a high intensity discharge lamp has an optimized configuration for maximizing efficiency and minimizing output light blockage. The coil comprises a conductive surface having a shape which corresponds to rotating a bilaterally symmetrical trapezoid about a coil center line in the same plane as the trapezoid without intersecting the center line. The conductive surface is disposed on a conductive core for efficient heat removal from the coil, resulting in reduced coil losses. In one embodiment, the coil cross section is increased by adding a rectangular portion to the trapezoidal portion, thereby extending the coil outwardly from the coil center line so as to remove heat from the coil more quickly without affecting light output from the lamp. The coil is constructed by separately casting the coil turns and brazing a connecting member therebetween, and then cutting a slit in each turn so as to electrically connect them in series.

REFERENCES:
patent: 4220839 (1980-09-01), De Leon
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4833287 (1989-05-01), Abe et al.
patent: 4910439 (1990-03-01), El-Hamamsy et al.

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