GB643935A - Improvements in or relating to high-frequency coils - Google Patents
Improvements in or relating to high-frequency coilsInfo
- Publication number
- GB643935A GB643935A GB14343/48A GB1434348A GB643935A GB 643935 A GB643935 A GB 643935A GB 14343/48 A GB14343/48 A GB 14343/48A GB 1434348 A GB1434348 A GB 1434348A GB 643935 A GB643935 A GB 643935A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- winding
- plunger
- moves
- ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
- H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
643,935. Transformers and inductances. PHILIPS ELECTRICAL, Ltd. May 27, 1948, No. 14343. Convention date, May 30, 1947. [Class 38 (ii)] In a high-frequency inductance or transformer a winding surrounds a cylindrical ferromagnetic core in an axially disposed hole in which moves a ferromagnetic plunger, the arrangement being such that as the plunger moves out of the hole the inductance of the winding increases. The core must not project from the winding by a distance more than half the core diameter. The result is obtained by making at least the core from a material, e.g. a ceramic such as a ferrite, having a permeability not less than 100, .so that the plunger emerging into a region of fairly high flux density reduces the reluctance of the flux path as a whole more than the space created inside the core increases it. Two windings variably coupled by a movable magnetic rod 27, preferably of ferrite, are mounted in housings 11, 11<SP>1</SP> moulded in a carrier member 19 which divides screening box 23 into two divisions which house respectively the leads to the two coils. Each winding 1 is mounted on a cylindrical core 7 in which moves a plunger 9 mounted on and moved by a non- magnetic screw 15. During manufacture the winding 1 is wound centrally on core 7 and after impregnation with wax the core is pushed through until one end is flush with one face of the winding. Specifications 433,366, [Group XXXVI], 629,946 and 637,099 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL643935X | 1947-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB643935A true GB643935A (en) | 1950-09-27 |
Family
ID=19791851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14343/48A Expired GB643935A (en) | 1947-05-30 | 1948-05-27 | Improvements in or relating to high-frequency coils |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB643935A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE944866C (en) * | 1951-09-28 | 1956-07-05 | Siemens Ag | High-frequency coil with a fixed main core and a movable adjustment core and a method for their adjustment |
-
1948
- 1948-05-27 GB GB14343/48A patent/GB643935A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE944866C (en) * | 1951-09-28 | 1956-07-05 | Siemens Ag | High-frequency coil with a fixed main core and a movable adjustment core and a method for their adjustment |
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