GB647960A - Improvements in permeability tuning arrangements - Google Patents
Improvements in permeability tuning arrangementsInfo
- Publication number
- GB647960A GB647960A GB22574/47A GB2257447A GB647960A GB 647960 A GB647960 A GB 647960A GB 22574/47 A GB22574/47 A GB 22574/47A GB 2257447 A GB2257447 A GB 2257447A GB 647960 A GB647960 A GB 647960A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coils
- core
- coil
- tuning range
- cores
- 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
- 230000035699 permeability Effects 0.000 title abstract 3
- 239000011162 core material Substances 0.000 abstract 10
- 230000000694 effects Effects 0.000 abstract 1
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000012256 powdered iron Substances 0.000 abstract 1
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
647,960. Inductances. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 14, 1947, No. 22574. Convention date, Aug. 14, 1946. [Class 38 (ii)] A permeability tuning arrangement comprises a pair of coils connected in either series or parallel aiding relation, each coil being provided with a ferromagnetic core whereby the self and mutual inductance may be varied by relative axial movement of the cores and coils in unison, wherein each coil has a part of its surface flatter than another part thereof, the coils being disposed with the flatter parts of their surfaces facing one another, thereby improving the tuning range over that available in an arrangement employing coils of circular cross-section. A tuning device comprises two coils 20, 21 and a movable core, preferably of the powdered iron type, having four members 24-27 which may or may not be joined by a common yoke 28 but which are always arranged to move in unison. The effect of the external members 26, 27 is to provide, for a given core movement, greater changes in the self and mutual inductances of the coils and in the self capacitance of the assembly than would be obtained if the arrangement 'comprised a single coil and core, the changes being greater, but in a less and less proportion as the number of coil and core groups is increased above two to increase the tuning range. The coils may be formed to any shape (e.g. square, circular, rectangular, triangular) the tuning range increasing as the proportion of the coil peripheries in intimate contact with each other increases. The electrical connections between the coils may be series or parallel, aiding or opposing, the greatest tuning range being obtained with the parallel aiding connection. Yet further increases in the tuning range may be obtained by (i) increasing the ratio of length to diameter of the coils ; (ii) making the cores longer than the coils ; (iii) earthing the cores to increase the change in self capacitance ; (iv) using core materials of higher permeability ; (v) moulding the coils into a former of low-loss, high-dielectric-constant material ; (vi) the provision of additional cores on each side of the coils.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US647960XA | 1946-08-14 | 1946-08-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB647960A true GB647960A (en) | 1950-12-28 |
Family
ID=22058330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22574/47A Expired GB647960A (en) | 1946-08-14 | 1947-08-14 | Improvements in permeability tuning arrangements |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB647960A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1486757A1 (en) * | 2002-02-20 | 2004-12-15 | Vasiliy Radinovich Rassomagin | Method for displacing controlled objects |
-
1947
- 1947-08-14 GB GB22574/47A patent/GB647960A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1486757A1 (en) * | 2002-02-20 | 2004-12-15 | Vasiliy Radinovich Rassomagin | Method for displacing controlled objects |
EP1486757A4 (en) * | 2002-02-20 | 2007-10-03 | Vasiliy Radionovich Rassomagin | Method for displacing controlled objects |
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