Inductor devices – Coils of special configuration – Polyhedral section
Patent
1993-09-16
1995-09-05
Picard, Leo P.
Inductor devices
Coils of special configuration
Polyhedral section
336225, 336206, 336196, H01F 2732
Patent
active
054482178
ABSTRACT:
An ignition coil is disclosed that includes a primary coil, a secondary coil and a core about which the primary and secondary coil are disposed. The secondary coil has in inner diameter greater than the diameter of the primary coil. The primary coil is disposed on the core and the secondary coil is disposed about the primary coil. The secondary coil includes a spiral-back pyramid winding configuration which results in a desired distributed capacitance for the secondary windings thereby providing desired electrical characteristics for a resonant circuit. The winding layers of the secondary coil decrease in the number of turns as the coil is wound to achieve a desired distributed capacitance of the coil. A spiral-back winding technique decreases adjacent winding layer voltages so that the inter-layer insulation requirements are reduced to a lower value thereby decreasing the insulation thickness of the secondary coil.
REFERENCES:
patent: 2813255 (1957-11-01), Williams et al.
patent: 3071845 (1963-01-01), Leonard et al.
patent: 3546580 (1970-12-01), Williams
patent: 3815069 (1974-06-01), Palazzetti et al.
patent: 4654563 (1987-03-01), Boyd
patent: 4677960 (1987-07-01), Ward
patent: 4794361 (1988-12-01), Young
patent: 5060623 (1991-10-01), McCoy
"Electronic Ignition System for Caterpillar Natural Gas Engines", Steven R. McCoy, et al.
"Transformers for Electronic Circuits", 2d Ed., Nathan R. Grossner, pp. 332-333, McGraw-Hill Book Company, 1983.
Kearney National Inc.
Picard Leo P.
Thomas L.
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