GB2376807A - Inductor with air gap having multiple separations - Google Patents
Inductor with air gap having multiple separations Download PDFInfo
- Publication number
- GB2376807A GB2376807A GB0114814A GB0114814A GB2376807A GB 2376807 A GB2376807 A GB 2376807A GB 0114814 A GB0114814 A GB 0114814A GB 0114814 A GB0114814 A GB 0114814A GB 2376807 A GB2376807 A GB 2376807A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inductor
- gap
- air gap
- gap portion
- magnetic core
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
An inductor comprising a magnetic core and an enameled wire wrapped around the core. The inductor has an air gap with at least a small-gap portion and a large-gap portion. The small-gap portion provides enough inductance in case of low load input to prevent harmonic distortion. The large-gap portion provides enough inductance in case of heavy load output and low input voltage to prevent saturation and temperature rise, thus enhancing efficiency. The magnetic core 1 may be composed of silicon-steel plates 11,12.
Description
i , INDUCTOR WITH MULTIPLE AIR-GAPS SEPARATIONS
\. FIELD OF THE INVENTION
The present invention relates to an inductor with multiple air-gap separations, especially to an inductor 5 having air-gap with multiple separations to provide better electrical property.
BACKGROUND OF THE INVENTION
The prior art inductor for large-current application
generally has large-volume silicon-steel plates, and an 10 air gap for increasing reluctance thereof, thus preventing saturation of the inductor. As shown in Fig. 1A and Fig. 1B, an inductor la is composed of an Ishaped silicon-steel plate lla and an E-shaped silicon-steel plate 12a, and an air gap 13a with uniform separation 15 between the I-shaped silicon-steel plate lla and the E-
shaped silicon-steel plate 12a.
However, the air gap 13a with uniform separation has some disadvantages. If the air gap 13a is small, the inductor la is saturated and the inductance thereof is 20 increased and temperature is increased in heavy load case (larger current). If the air gap 13a is large, the inductance is not enough to prevent harmonic distortion in low load case (small current). The temperature cannot be decreased to enhance efficiency in low output voltage 25 and heavy load condition.
As can be seen from above description, the inductor
having air gap with uniform separation has serious problem. SUMMARY OF THE INVENTION
30 It is the object of the present invention to provide an inductor with multiple air-gap separations to overcome above problem.
- To achieve above object, the present invention provides an inductor with multiple air-gap separations comprises a magnetic core and an enameled wire around the magnetic core. The magnetic core has an air gap with at 5 least a large-gap portion and a small-gap portion. The small- gap portion provides enough inductance in case of low load input to prevent harmonic distortion. The large-gap portion provides enough inductance in case of heavy load output and low input voltage to prevent 10 saturation and temperature rise. The air gap has a surface of stair shape, bevel shape or a curved surface to optimize the electrical property of the inductor.
The various objects and advantages of the prevent invention will be more readily understood from the 15 following detailed description when read in conjunction
with the appended drawing, in which: BRIEF DESCRIPTION OF DRAWING
Fig. lA shows the perspective view of the prior art
inductor; 20 Fig. lB shows the front view of the prior art
inductor; Fig. 2A shows the perspective view of the I-shaped siliconsteel plate padded with paper in the present invention; 25 Fig. 2B shows the front view of the I-shaped silicon-steel plate padded with paper in the present invention; Fig. 3A is a left side view of F-shaped silicon s eel plate subjected to punching in the present 30 invention;
:\ Fig. 3B is a right side view of E-shaped silicon steel plate subjected to punching in the present invention; Fig. 4 shows the relationship between inductance and 5 current of the inventive inductor; Fig. 5A is a front view of air gap with bevel plane in the present invention; and Fig. 5B is a front view of air gap with a curved surface in the present invention.
I O DESCRIPTION OF THE INVENTION
With reference now to Figs 2A and 2B, the present invention provides an inductor with multiple air-gaps combination. The inductor according to the present invention is composed of a magnetic core l and an IS enameled wire 2 around the magnetic core 1. The magnetic core 1 is composed of a plurality of silicon-steel plates including an I-shaped silicon-steel plate 11 and an E-
shaped silicon-steel plate 12. The I-shaped silicon-
steel plate 11 is padded with papers 3 on topside and 20 bottom side thereof to provide an air gap with various separations such that the surface 131 of the air gap 13 is of stair shape and composed of a smallgap portion 132 and a large-gap portion 133 to provide an air gap 13 with various separations.
25 The air gap 13 with various separations can be formed by other ways than padding with paper. As shown in Figs. 3A and 3B, the center bar 121 of the E-shaped silicon-steel plate 12 is punched and pressed to form the small-gap portion 132 and the large-gap portion 133, 30 before the enameled wire 2 is arranged.
Provided that the input power is 150W, in the present invention, the small-gap portion 132 has
S separation of 5 mils (1 mil = 0.00 1 inch), and the large-gap portion 133 has separation of 45 mils.
Moreover, the small-gap portion 132 and the large-gap portion 133 each occupy 50% area of the air gap 13, i.e., S the area ration is 1:1. The relationship between inductance and current of the inventive inductor is represented by the solid line in Fig. 4. As compared with an inductor having air gap with uniform separation 12 mils (represented by the dash line in Fig. 4), the 10 inventive inductor with air gap of various separation has large inductance in conditions of large current (3-4A) and small current (below 0.9 A).
Therefore, the small-gap portion 132 of the inventive inductor provides enough inductance in case of Is low load input to prevent harmonic distortion. The large-gap portion 133 of the inventive inductor provides enough inductance in case of heavy load output and low input voltage to prevent saturation and temperature rise, thus enhancing power efficiency. The electrical property 20 of the inventive inductor can be optimized by controlling the various separations.
Moreover, as shown in Figs. 5A and 5B, the surface 131 of the sex gap 13 can also be bevel plane or a curved surface. 25 To sum up, the inductor with multiple air-gap separations according to the present invention has following advantages: (1) The harmonic distortion can be prevented in low load condition; 30 (2) The temperature can rise can be prevented in condition of heavy load output and low input voltage;
/ t: (3) The power efficiency is enhanced; (4) The volume of inductor is reduced; Although the present invention has been described with reference to the preferred embodiment thereof, it 5 will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary
skill in the art. Therefore, all such substitutions and 10 modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Claims (4)
- CLAIMS:l. An inductor with multiple air-gap separations, comprising a magnetic core and an enameled wire around the magnetic core, the magnetic core 5 having an air gap with at least two different separations, the air gap having a surface of stair shape, bevel shape or a curved surface to optimize the electrical property of the inductor.
- 2. The inductor with multiple- air-gap separations as in claim l, wherein the magnetic core is composed of a plurality of silicon-steel plates.
- 3. An inductor with multiple air-gap separations substantially as hereinbefore described with reference to Figures 2A,2B, 3A, 3B and
- 4.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128527A DE10128527A1 (en) | 2001-06-13 | 2001-06-13 | Inductor for large-current application, includes magnetic core with air gap having small and large gap portions and stair-shaped surface |
GB0114814A GB2376807A (en) | 2001-06-13 | 2001-06-18 | Inductor with air gap having multiple separations |
FR0108738A FR2826773B1 (en) | 2001-06-13 | 2001-07-02 | MULTI-SEPARATION INDUCTOR COIL IN THE GATE |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128527A DE10128527A1 (en) | 2001-06-13 | 2001-06-13 | Inductor for large-current application, includes magnetic core with air gap having small and large gap portions and stair-shaped surface |
GB0114814A GB2376807A (en) | 2001-06-13 | 2001-06-18 | Inductor with air gap having multiple separations |
FR0108738A FR2826773B1 (en) | 2001-06-13 | 2001-07-02 | MULTI-SEPARATION INDUCTOR COIL IN THE GATE |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0114814D0 GB0114814D0 (en) | 2001-08-08 |
GB2376807A true GB2376807A (en) | 2002-12-24 |
Family
ID=27214469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0114814A Withdrawn GB2376807A (en) | 2001-06-13 | 2001-06-18 | Inductor with air gap having multiple separations |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE10128527A1 (en) |
FR (1) | FR2826773B1 (en) |
GB (1) | GB2376807A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2442128A (en) * | 2006-09-21 | 2008-03-26 | Ford Global Tech Llc | Inductor core structures |
US8410889B2 (en) | 2011-11-03 | 2013-04-02 | Enecsys Limited | Transformer construction |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010015410A1 (en) * | 2010-04-19 | 2011-10-20 | SUMIDA Components & Modules GmbH | Inductive component with variable core properties and method for their adjustment |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US13819A (en) * | 1855-11-20 | Treating leather tor enameling | ||
DE2848119A1 (en) * | 1978-11-06 | 1980-05-14 | Siemens Ag | Choke for DC=DC pulsed power converter - has air gap slot at one end with faces diverging at angle selected for linear inductance-current relationship |
EP0039485A1 (en) * | 1980-05-07 | 1981-11-11 | Licentia Patent-Verwaltungs-GmbH | Line transformer for a television receiver |
JPH08316039A (en) * | 1995-05-22 | 1996-11-29 | Nemic Lambda Kk | Choke coil for suppressing harmonic current |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2753709A1 (en) * | 1977-12-02 | 1979-06-07 | Blum Eisen & Metallind | PACKAGE TO BE MADE OF SHEET METAL FOR ELECTRICAL MACHINERY, SUCH AS TRANSFORMERS, REACTOR COILS, IGNITION COILS, ELECTRIC MOTORS, GENERATORS OR THE LIKE. |
TR199902411A2 (en) * | 1998-11-02 | 2000-06-21 | Lincoln Global, Inc. | Output coil and usage method for direct current welding machine |
-
2001
- 2001-06-13 DE DE10128527A patent/DE10128527A1/en not_active Ceased
- 2001-06-18 GB GB0114814A patent/GB2376807A/en not_active Withdrawn
- 2001-07-02 FR FR0108738A patent/FR2826773B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US13819A (en) * | 1855-11-20 | Treating leather tor enameling | ||
DE2848119A1 (en) * | 1978-11-06 | 1980-05-14 | Siemens Ag | Choke for DC=DC pulsed power converter - has air gap slot at one end with faces diverging at angle selected for linear inductance-current relationship |
EP0039485A1 (en) * | 1980-05-07 | 1981-11-11 | Licentia Patent-Verwaltungs-GmbH | Line transformer for a television receiver |
JPH08316039A (en) * | 1995-05-22 | 1996-11-29 | Nemic Lambda Kk | Choke coil for suppressing harmonic current |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2442128A (en) * | 2006-09-21 | 2008-03-26 | Ford Global Tech Llc | Inductor core structures |
US8410889B2 (en) | 2011-11-03 | 2013-04-02 | Enecsys Limited | Transformer construction |
US8917156B2 (en) | 2011-11-03 | 2014-12-23 | Enecsys Limited | Transformer construction |
US9728324B2 (en) | 2011-11-03 | 2017-08-08 | Solarcity Corporation | Transformer construction |
Also Published As
Publication number | Publication date |
---|---|
GB0114814D0 (en) | 2001-08-08 |
DE10128527A1 (en) | 2002-12-19 |
FR2826773A1 (en) | 2003-01-03 |
FR2826773B1 (en) | 2004-11-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |