US3243745A - Adjustable inductor - Google Patents
Adjustable inductor Download PDFInfo
- Publication number
- US3243745A US3243745A US293605A US29360563A US3243745A US 3243745 A US3243745 A US 3243745A US 293605 A US293605 A US 293605A US 29360563 A US29360563 A US 29360563A US 3243745 A US3243745 A US 3243745A
- Authority
- US
- United States
- Prior art keywords
- winding
- serrations
- core
- adjustable inductor
- cavity
- 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 - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 26
- 239000000696 magnetic material Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 3
- 241001424309 Arita Species 0.000 description 1
- 241000219793 Trifolium Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/043—Fixed inductances of the signal type with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
- H01F29/10—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable part of magnetic circuit
Definitions
- an adjustable inductor including a pot core of magnetic material having a central boss, and a winding positioned within a cavity of the core "by means of a washer of flexible insulating material, the central hole of the washer having a smaller diameter than the outer diameter of the boss.
- a method of assembling a winding for an adjustable inductor within the cavity of a pot core which includes the steps of inserting, into the cavity, a flexible insulating washer having an inner diameter smaller than the outer diameter of the inner boss of the core, and placing a winding in the cavity in contact with the washer.
- FIG. 1 shows a longitudinal partial section through an adjustable inductor
- FIG. 2 is a plan view of the inductor assembly.
- the two half shells forming the magnetic core and main body of the inductor are indicated by 1 and 22. They may be of any suitable magnetic material, for example ferrite. These half-cores abut along the faces 2 and can be fixed to each other by any convenient cement or adhesive. An air gap 3 is provided between the central bosses of the half-cores and determines the minimum value of the inductance of the coil.
- A' movable slug 4 also of magnetic material, is arranged within the cylindrical bore of the core.
- the slug can be moved axially by means of a screw 6 cooperating with a nut 8 and brought into a position to bridge the air gap of the core and thus increase the inductance of a winding disposed within the cavity formed by the two half-cores.
- Base 12 of ceramic material, is attached to the core 22, and is provided with terminals 13 for the lead out wires of the winding 5. It might also be provided with means for securing it to a printed circuit board.
- the base 12 can, if required, be mounted on the opposite end of the core assembly, so that the adjustment of the slug can be carried out through the surface on which the inductor is mounted. Hole 11 is provided for this purpose in the base 12.
- the ratio of reactance to resistance of the winding is termed the Q factor of the inductor and is a measure of its efiiciency.
- the volume of the winding 5 must be a maximum.
- the winding 5 is wound on a bobbin or former which locates the winding on the core. Bobbins however take up space and reduce the volume of the winding and thereby the Q factor.
- the winding 5 is located within the cavity of the core 1 by means of washers 14 having their inner and outer edges serrated.
- the outer edge of the upper washer is visible in the View shown in FIG. 2.
- the washers are made for example, of plastic material or of mica.
- the inner serrated edges 15 of the washers are of smaller diameter than the outer diameter of the central bosses 16 of the half-cores 1 and 31. When the washers are forced over the bosses 16 the serrations 15 are bent back by the core providing a curved surface which locates the inner surface 17 of the winding and provides a uniform gap between the bosses 16 and the winding.
- the outer serrated edge 18 of the washer 14 is of larger diameter than the maximum diameter of the winding cavity in the core 1.
- These serrations are also folded back by the core as is indicated at 19 in FIG. 1, except in those parts shown in FIG. 2 where the outer wall of the core 1 is cut away to provide channels 20 through which the leadout wires 21 of the winding are taken for connection to terminals 13. In these channels the outer serrations 18 of the washers are not folded back and act as guides or fanning strips for the wires.
- the pitch of the serrations is chosen to give the desired number of supporting points for the leadout wires.
- An adjustable inductor comprising:
- pot core formed of two half-shells of magnetic material, said pot core having a central boss and an outer wall, said boss and said wall defining therebetween an annular cavity;
- said means including a washer of flexible, insulating material interposed between said pot core and said winding, at each end of said winding, said washers having serrations about the inner and outer diameters thereof, all of said inner serrations and most of said outer serrations being bent and disposed between said walls and said winding.
- said lead-out wires extend radially and are disposed within the serrations of said outer diameter.
Description
March 29, 1966 w. F. GLCVER ETAL 3,
ADJUSTABLE INDUCTOR I Filed July 9, 1963 SylAL L orig Inventors WILLIAM F. CLOVER ACK c. a
F/GZ.
United States Patent 3,243,745 ADJUSTABLE INDUCTOR William Frank Glover and Jack George Bendall, London, England, assignors to International Standard Electric Corporation, New York, N.Y., a corporation of Delaware Filed July 9, 1963, Ser. No. 293,605 Claims priority, application Great Britain, July 11, 1962, 26,651/ 62 2 Claims. (Cl. 336-83) This invention relates to adjustable inductors using pot shaped cores of magnetic material, and to a method of their assembly.
The present trend towards smaller components introduces a number of conflicting requirements amongst which are reduced overall dimensions combined with a maximum ratio of inductance to resistance, ease of manufacture and of assembly.
According to the invention there is provided an adjustable inductor including a pot core of magnetic material having a central boss, and a winding positioned within a cavity of the core "by means of a washer of flexible insulating material, the central hole of the washer having a smaller diameter than the outer diameter of the boss.
According to the present invention there is further provided a method of assembling a winding for an adjustable inductor within the cavity of a pot core, which includes the steps of inserting, into the cavity, a flexible insulating washer having an inner diameter smaller than the outer diameter of the inner boss of the core, and placing a winding in the cavity in contact with the washer.
The invention will now be described with reference to the accompanying drawings in which:
FIG. 1 shows a longitudinal partial section through an adjustable inductor; and
FIG. 2 is a plan view of the inductor assembly.
Referring to FIG. 1 the two half shells forming the magnetic core and main body of the inductor are indicated by 1 and 22. They may be of any suitable magnetic material, for example ferrite. These half-cores abut along the faces 2 and can be fixed to each other by any convenient cement or adhesive. An air gap 3 is provided between the central bosses of the half-cores and determines the minimum value of the inductance of the coil.
A' movable slug 4 also of magnetic material, is arranged within the cylindrical bore of the core. The slug can be moved axially by means of a screw 6 cooperating with a nut 8 and brought into a position to bridge the air gap of the core and thus increase the inductance of a winding disposed within the cavity formed by the two half-cores.
The ratio of reactance to resistance of the winding is termed the Q factor of the inductor and is a measure of its efiiciency. To keep the latter high, for a given size of core, the volume of the winding 5 must be a maximum. In conventional arrangements the winding 5 is wound on a bobbin or former which locates the winding on the core. Bobbins however take up space and reduce the volume of the winding and thereby the Q factor.
In the winding of FIG. 1 no bobbin is used, the winding being self supporting. Various techniques for producing such windings are known.
The winding 5 is located within the cavity of the core 1 by means of washers 14 having their inner and outer edges serrated. The outer edge of the upper washer is visible in the View shown in FIG. 2. The washers are made for example, of plastic material or of mica. The inner serrated edges 15 of the washers are of smaller diameter than the outer diameter of the central bosses 16 of the half-cores 1 and 31. When the washers are forced over the bosses 16 the serrations 15 are bent back by the core providing a curved surface which locates the inner surface 17 of the winding and provides a uniform gap between the bosses 16 and the winding. The outer serrated edge 18 of the washer 14 is of larger diameter than the maximum diameter of the winding cavity in the core 1. These serrations are also folded back by the core as is indicated at 19 in FIG. 1, except in those parts shown in FIG. 2 where the outer wall of the core 1 is cut away to provide channels 20 through which the leadout wires 21 of the winding are taken for connection to terminals 13. In these channels the outer serrations 18 of the washers are not folded back and act as guides or fanning strips for the wires. The pitch of the serrations is chosen to give the desired number of supporting points for the leadout wires.
It is to be understood that the foregoing description of specific examples of this invention is not to be considered as a limitation on its scope.
What we claim is:
1. An adjustable inductor, comprising:
a pot core formed of two half-shells of magnetic material, said pot core having a central boss and an outer wall, said boss and said wall defining therebetween an annular cavity;
a winding, having lead-out wires;
means for centrally positioning said winding within said cavity about and spaced from said central boss, said means including a washer of flexible, insulating material interposed between said pot core and said winding, at each end of said winding, said washers having serrations about the inner and outer diameters thereof, all of said inner serrations and most of said outer serrations being bent and disposed between said walls and said winding.
2. An adjustable inductor, according to claim 1,
wherein:
said lead-out wires extend radially and are disposed within the serrations of said outer diameter.
References Cited by the Examiner UNITED STATES PATENTS 5/1934 Strait 336192 1/1964 Arita 336-136
Claims (2)
1. AN ADJUSTABLE INDUCTOR, COMPRISING: A POT CORE FORMED OF TWO HALF-SHELLS OF MAGNETIC MATERIAL, SAID POT CORE HAVING A CENTRAL BOSS AND AN OUTER WALL, SAID BOSS AND SAID WALL DEFINING THEREBETWEEN AN ANNULAR CAVITY; A WINDING, HAVING LEAD-OUT WIRES; MEANS FOR CENTRALLY POSITIONING SAID WINDING WITHIN SAID CAVITY ABOUT AND SPACED FROM SAID CENTRAL BOSS, SAID MEANS INCLUDING A WASHER OF FLEXIBLE, INSULATING MATERIAL INTERPOSED BETWEEN SAID POT CORE AND SAID WINDING, AT EACH END OF SAID WINDING, SAID WASHERS HAVING SERRATIONS ABOUT THE INNER AND OUTER DIAMETERS THEREOF, ALL OF SAID INNER SERRATIONS AND MOST OF SAID OUTER SERRATIONS BEING BENT AND DISPOSED BETWEEN SAID WALLS AND SAID WINDING.
2. AN ADJUSTABLE INDUCTOR, ACCORDING TO CLAIM 1, WHEREIN: SAID LEAD-OUT WIRES EXTEND RADIALLY AND ARE DISPOSED WITHIN THE SERRATIONS OF SAID OUTER DIAMETER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB26651/62A GB966936A (en) | 1962-07-11 | 1962-07-11 | Adjustable inductor |
Publications (1)
Publication Number | Publication Date |
---|---|
US3243745A true US3243745A (en) | 1966-03-29 |
Family
ID=10247025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US293605A Expired - Lifetime US3243745A (en) | 1962-07-11 | 1963-07-09 | Adjustable inductor |
Country Status (2)
Country | Link |
---|---|
US (1) | US3243745A (en) |
GB (1) | GB966936A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347257A (en) * | 1990-02-23 | 1994-09-13 | Stocker & Yale, Inc. | Varying inductances |
US20070182077A1 (en) * | 2006-01-10 | 2007-08-09 | Keihin Corporation | Active vibration isolation support system |
US20090009009A1 (en) * | 2007-07-06 | 2009-01-08 | Keihin Corporation | Active vibration isolation support system |
US20130162384A1 (en) * | 2011-12-23 | 2013-06-27 | Delta Electronics (Shanghai) Co.,Ltd. | Device and manufacturing method for a direct current filter inductor |
WO2015082138A1 (en) * | 2013-12-04 | 2015-06-11 | Epcos Ag | Transducer component with inductivity adjustment |
US20160225518A1 (en) * | 2013-09-24 | 2016-08-04 | Turtle Beach Corporation | Tunable inductive device for parametric audio systems and related methods |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1956881A (en) * | 1931-10-07 | 1934-05-01 | Gen Cable Corp | Coil |
US3119975A (en) * | 1960-12-29 | 1964-01-28 | Tdk Electronics Co Ltd | Variable inductance magnetic core |
-
1962
- 1962-07-11 GB GB26651/62A patent/GB966936A/en not_active Expired
-
1963
- 1963-07-09 US US293605A patent/US3243745A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1956881A (en) * | 1931-10-07 | 1934-05-01 | Gen Cable Corp | Coil |
US3119975A (en) * | 1960-12-29 | 1964-01-28 | Tdk Electronics Co Ltd | Variable inductance magnetic core |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347257A (en) * | 1990-02-23 | 1994-09-13 | Stocker & Yale, Inc. | Varying inductances |
US20070182077A1 (en) * | 2006-01-10 | 2007-08-09 | Keihin Corporation | Active vibration isolation support system |
US7992848B2 (en) * | 2006-01-10 | 2011-08-09 | Keihin Corporation | Active vibration isolation support system |
US8616535B2 (en) | 2007-07-06 | 2013-12-31 | Keihin Corporation | Active vibration isolation support system |
US20090009009A1 (en) * | 2007-07-06 | 2009-01-08 | Keihin Corporation | Active vibration isolation support system |
US8922316B2 (en) * | 2011-12-23 | 2014-12-30 | Delta Electronics (Shanghai) Co., Ltd. | Device and manufacturing method for a direct current filter inductor |
US20130162384A1 (en) * | 2011-12-23 | 2013-06-27 | Delta Electronics (Shanghai) Co.,Ltd. | Device and manufacturing method for a direct current filter inductor |
US20160225518A1 (en) * | 2013-09-24 | 2016-08-04 | Turtle Beach Corporation | Tunable inductive device for parametric audio systems and related methods |
WO2015082138A1 (en) * | 2013-12-04 | 2015-06-11 | Epcos Ag | Transducer component with inductivity adjustment |
CN105765676A (en) * | 2013-12-04 | 2016-07-13 | 埃普科斯股份有限公司 | Transducer component with inductivity adjustment |
US20170053730A1 (en) * | 2013-12-04 | 2017-02-23 | Epcos Ag | Transformer Component with Setting of an Inductance |
CN105765676B (en) * | 2013-12-04 | 2017-08-04 | 埃普科斯股份有限公司 | The transformer configuration element of adjustment with sensing |
US10256026B2 (en) * | 2013-12-04 | 2019-04-09 | Epcos Ag | Transformer component with setting of an inductance |
Also Published As
Publication number | Publication date |
---|---|
GB966936A (en) | 1964-08-19 |
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