Coil device
US5315279A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1991 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Feb 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a coil device including magnetic cores having gap regions and a coil wound to contain the gap regions. The present invention provides an improvement in which a shape of at least one of the opposing magnetic cores forming the gap regions is formed into a curve of logarithmic function from its base end to its extreme end, its most extreme end is provided with a gap adjusting flat surface and then a plurality of gaps are formed in the gap regions. With such an arrangement as above, the present invention provides the coil device capable of reducing a leakage magnetic flux produced around the gaps, preventing an abnormal generation of heat of the coils and further preventing a bad influence of noise against a peripheral apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.