Inductor devices – Winding formed of plural coils
Patent
1991-08-26
1993-01-26
Kozma, Thomas J.
Inductor devices
Winding formed of plural coils
336182, H01F 2730
Patent
active
051825376
ABSTRACT:
The transformer comprises an annular core (1) of a soft-magnetic material on which there are provided a first winding and a second winding. The second winding comprises n turns more than the first winding. The first winding consisted of a first conductor (3) and a second conductor (5), the second winding consisting of a third conductor (7). The three conductors (3, 5, 7) are twisted over a part of their length so as to form a cable (9) wherefrom a common winding is formed which includes at least a part of the second winding and substantially the entire first winding. Near one end of the common winding there are provided n additional turns of the first conductor (3) and near its other end there are provided n additional turns of the second conductor (5). The corresponding end portions of the first and second conductors (3, 5) are electrically interconnected in order to form terminals (13, 19) of the first winding, and the end portions of the third conductor (7) form terminals (11, 15) of the second winding. Because the n additional turns of the second winding are situated substantially symmetrically with respect to the first winding, the leakage inductance is comparatively low.
REFERENCES:
patent: 1133750 (1915-03-01), Shaw
patent: 1424726 (1922-08-01), Johnson
patent: 1559858 (1925-11-01), Field
patent: 3274520 (1966-09-01), Eddy et al.
Blocker Edward
Kozma Thomas J.
U.S. Philips Corporation
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