Patent · US Expired

Twin coil

US4973930A · kind A · utility

2Cited by

8References

3Claims

0Family size

Assignee

Vogt Electronic AG · DE

Inventors

Udo Mai · Hauzenberg, DE
Uwe Hartmann · Stuttgart, DE

Key dates

Filing date	Jul 12, 1989
Grant date	Nov 27, 1990
Priority date	—
Expiry date	Jul 12, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH01F2017/0053
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A coil arrangement comprising two coils on a single coil former, termed a twin coil, is characterized in that the two coils (W1, W2 and, respectively, W3A), with any respective individual magnetic core (10 or, respectively, 9) required, are mounted with a substantial distance from each other on the coil former (1) and in that the respective residual coupling of the coils (W1, W2 and W3A) is eliminated by an oppositely wound or connected compensation winding (W3B). The compensating winding (8) is located in the one winding compartment (3) and has current from the coil in the other winding chamber (4) flowing through it. As a result the twin coil in accordance with the invention leads to some advantages over known twin coils in which the coupling between the two coils is nearly 100%.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.