CN115579219B - Variable inductance reactor and preparation method thereof - Google Patents

Variable inductance reactor and preparation method thereof Download PDF

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Publication number
CN115579219B
CN115579219B CN202211405386.5A CN202211405386A CN115579219B CN 115579219 B CN115579219 B CN 115579219B CN 202211405386 A CN202211405386 A CN 202211405386A CN 115579219 B CN115579219 B CN 115579219B
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China
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air gap
reactor
iron core
core column
epoxy plate
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CN115579219A (en
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于良中
欧阳乾赞
黄文进
冯亚明
吴景营
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Guangdong Guangda Electrical Co ltd
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Guangdong Guangda Electrical Co ltd
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    • 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
    • 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
    • H01F21/12—Variable inductances or transformers of the signal type discontinuously variable, e.g. tapped
    • 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
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Abstract

The application relates to a variable inductance reactor and a preparation method thereof, wherein the variable inductance reactor comprises: the coil comprises two iron yokes (1), an iron core column (2) arranged between the two iron yokes (1) and a coil sleeved on the iron core column (2); the iron core column (2) consists of an epoxy plate air gap (3) and discuses (4) which are arranged at intervals; the epoxy plate air gap (3) is provided with a groove (5), and the groove (5) is filled with a low-saturation magnetic conduction air gap material. The variable inductance reactor can realize that the current under a plurality of working conditions corresponds to a plurality of inductances, thereby improving the filtering effect of the frequency converter or the inverter.

Description

Variable inductance reactor and preparation method thereof
Technical Field
The application relates to the technical field of reactors, in particular to a variable inductance reactor and a preparation method thereof.
Background
Reactors are commonly used in frequency converters or inverters for filtering.
The existing reactor structure has only one inductance value, so that when the reactor is applied to a frequency converter or an inverter, the filtering effect of the frequency converter or the inverter is better in the case of large current, but the filtering effect of the frequency converter or the inverter is poorer in the case of small current, and therefore, the frequency converter or the inverter needs to be further improved.
Disclosure of Invention
In order to enable the reactor to have good filtering effects on large current and small current when being applied to a frequency converter or an inverter, the application provides a variable inductance reactor and a preparation method thereof.
In a first aspect, the present application provides a variable inductance reactor, which adopts the following technical scheme:
a variable inductance reactor, comprising: the device comprises two iron yokes, an iron core column arranged between the two iron yokes and a coil sleeved on the iron core column; the iron core column consists of epoxy plate air gaps and discus which are arranged at intervals; the epoxy plate air gap is provided with a groove, and the groove is filled with a low-saturation magnetic conduction air gap material.
Through adopting above-mentioned technical scheme, set up the iron core post between two yokes, the iron core post comprises epoxy board air gap and discus that the interval was placed, is in simultaneously set up the recess on the epoxy board air gap to fill low saturation magnetic conduction air gap material in the recess, thereby can realize when the reactor is applied to converter or dc-to-ac converter, the electric current under a plurality of operating modes can correspond a plurality of inductances, thereby improves the filter effect of converter or dc-to-ac converter.
Preferably, the low-saturation magnetic conduction air gap material is prepared from 80% -90% of metal powder and 10% -20% of resin. Therefore, the processing difficulty can be improved, otherwise, the stirring and processing are inconvenient when the resin is more.
Preferably, the metal powder is formed by mixing 80% -90% of iron powder, 5% -10% of silicon powder and 5% -10% of aluminum powder. Therefore, the magnetic conduction saturation degree can be adjusted according to actual needs.
Preferably, the thickness of the air gap of the epoxy plate isWherein d is the diameter of the iron core column, so that the production process is well realized, and the magnetic leakage is small; when the thickness of the air gap of the epoxy plate is smaller than 1mm, the process is not well realized, and the production difficulty is high; when the thickness of the air gap of the epoxy plate is greater than +.>When the leakage flux is too large, the reactor heats seriously.
Preferably, through the epoxyThe area ratio of the grooves on the air gap of the plate is used for adjusting the adjusting depth of the reactor; wherein the adjustment depth of the reactor is
Preferably, the area of the groove on the air gap of the epoxy plate accounts for 20% -90%, so that the inductance adjustment depth can be 2 times; when the area ratio of the grooves on the air gap of the epoxy plate is smaller than 20%, the inductance adjustment depth is insufficient; when the area ratio of the grooves on the epoxy plate air gap is more than 90%, the strength of the epoxy plate air gap is insufficient.
Preferably, the area of each groove is the total area of the groovesThereby reducing eddy current and further reducing the heating of the reactor; when the area of each groove is smaller than the total area of the grooves>When the method is used, the processing amount is huge; when the area of each groove is larger than +.>In this case, eddy currents are easily formed, and the reactor is severely heated.
Preferably, when the number, the size and the arrangement mode of the grooves on the air gap of the epoxy plate arranged in the middle of the iron core column are completely consistent, the reactor can correspondingly adjust two-gear current, and a better filtering effect is realized for certain two-gear current; when the number, the size or the arrangement mode of the grooves on the air gaps of the epoxy plates arranged in the middle of the iron core column are not completely consistent, the reactor can correspondingly adjust currents larger than two gears, so that multiple-gear currents can be adjusted when the reactor is applied to a frequency converter or an inverter, and good filtering effects can be achieved for the multiple-gear currents.
In a second aspect, the preparation method of the variable inductance reactor provided by the application adopts the following technical scheme:
slotting the air gap of the epoxy plate, and adding a low-saturation magnetic conduction air gap material into the slot;
placing the processed epoxy plate air gap and discus at intervals to form an iron core column;
the core limb is placed between two iron yokes and is integrally impregnated with resin, and then heated and dried.
By adopting the technical scheme, the preparation of the variable inductance reactor can be realized by adopting a simple process, and when the prepared reactor is applied to a frequency converter or an inverter, the current under a plurality of working conditions can correspond to a plurality of inductors, so that the filtering effect of the frequency converter or the inverter is improved.
Preferably, the adding the low saturation magnetic conductive air gap material into the groove comprises:
and solidifying the low-saturation magnetic conduction air gap material into a block by using a die, and then adding the block-shaped low-saturation magnetic conduction air gap material into the groove.
By adopting the technical scheme, the production efficiency and consistency of the variable inductance reactor can be improved.
Preferably, when the epoxy board air gap has a plurality of epoxy board air gaps, the epoxy board air gap further comprises, before the integral resin dipping: the iron core columns are aligned and fixed by adopting the glass fiber belts, so that noise when the reactor is used is reduced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the application, the iron core column is arranged between the two iron yokes, the iron core column consists of the epoxy plate air gaps and the discus which are arranged at intervals, meanwhile, the grooves are formed in the epoxy plate air gaps, and the low-saturation magnetic conduction air gap materials are filled in the grooves, so that when the reactor is applied to a frequency converter or an inverter, currents under a plurality of working conditions can correspond to a plurality of inductors, and the filtering effect of the frequency converter or the inverter is improved.
2. According to the application, when the number, the size and the arrangement mode of the grooves on the air gap of the epoxy plate arranged in the middle of the iron core column are completely consistent, the reactor can correspondingly adjust two-gear current, and a better filtering effect is realized for certain two-gear current; when the number, the size or the arrangement mode of the grooves on the air gaps of the epoxy plates arranged in the middle of the iron core column are not completely consistent, the reactor can correspondingly adjust currents larger than two gears, so that multiple-gear currents can be adjusted when the reactor is applied to a frequency converter or an inverter, and good filtering effects can be achieved for the multiple-gear currents.
Drawings
Fig. 1 is a schematic cross-sectional view of a conventional reactor.
Fig. 2 is a schematic cross-sectional view of a variable inductance reactor in one embodiment of the application.
FIG. 3 is a schematic diagram of the groove distribution over the air gap of an epoxy board in one embodiment of the present application.
Reference numerals illustrate: 1. an iron yoke; 2. an iron core column; 3. an epoxy board air gap; 4. discus; 5. a groove.
Detailed Description
The application is described in further detail below with reference to fig. 1-3.
As shown in fig. 1, the reactor in the prior art comprises two yokes 1, an iron core column 2 arranged between the yokes 1, and a coil (not shown in the figure) sleeved on the iron core column 2, wherein the iron core column 2 is composed of an epoxy plate air gap 3 and discus 4 which are arranged at intervals. That is, as shown in fig. 1, the A, B, C, D epoxy board air gap 3 is a flat board, so when the reactor is applied to a frequency converter or an inverter, the reactor has only a fixed inductance value (determined by the epoxy board air gap) for different working conditions of current, and therefore, the filtering effect of the frequency converter or the inverter for high current is better, but the filtering effect of the frequency converter or the inverter for low current is poorer.
In order to solve the problems, the embodiment of the application discloses a variable inductance reactor. Referring to fig. 2 and 3, a variable inductance reactor includes: two yokes 1, a core limb 2 provided between the yokes 1, and a coil (not shown) sleeved on the core limb 2; the iron core column 2 consists of an epoxy plate air gap 3 and discus 4 which are arranged at intervals; the epoxy plate air gap 3 is provided with a groove 5, and the groove 5 is filled with a low-saturation magnetic conduction air gap material.
Optionally, in an embodiment, the low saturation magnetic conductive air gap material is prepared from 80% -90% of metal powder and 10% -20% of resin.
Specifically, the metal powder is formed by mixing 80% -90% of iron powder, 5% -10% of silicon powder and 5% -10% of aluminum powder.
In other embodiments, other conventional magnetically permeable materials may be used.
In one embodiment, the epoxy board air gap 3 has a thickness ofWhere d is the diameter of the core limb 2. In other embodiments, the thickness of the epoxy board air gap 3 may take other values.
Optionally, the adjustment depth of the reactor is adjusted by the area ratio of the groove 5 on the epoxy plate air gap 3; wherein the adjustment depth of the reactor isAny current as described herein refers to a current determined according to actual needs. According to the current actually required, the magnetic flux of the reactor can be obtained, and then the size of the air gap cross section corresponding to the saturation magnetic flux can be obtained according to the magnetic flux, so that the area occupation ratio of the groove 5 on the air gap 3 of the epoxy plate is obtained.
In one embodiment, the area of the groove 5 on the epoxy board air gap 3 is 20% -90%. In other embodiments, the area ratio of the grooves 5 on the epoxy board air gap 3 can take other values.
In one embodiment, the area of each groove 5 is the total area of the grooves 5In other embodiments, the ratio of the area of each groove 5 to the total area may take other values.
The shape of the epoxy plate air gap 3 is round or square; the shape of the groove 5 is round or square.
In this embodiment, when the number, the size and the arrangement of the grooves 5 on the epoxy board air gaps 3 disposed in the middle of the core column 2 are completely consistent, the reactor can correspondingly adjust two-stage current, i.e. for example, the number, the size and the arrangement of the grooves 5 on the epoxy board air gaps a ', B', C ', D' in fig. 2 are completely consistent, a ', B', C ', D' are equivalent to series connection, and the corresponding reactor has an inductance value when a ', B', C ', D' are saturated; when A ', B', C ', D' are unsaturated, the other inductance value is corresponding, so that the two-gear current can be regulated; when the number, the size or the arrangement mode of the grooves 5 on the epoxy plate air gaps 3 arranged in the middle of the iron core column 2 are not completely consistent, the reactor can correspondingly adjust more than two current grades; i.e. when any of the number, the size and the arrangement of the grooves 5 on the air gaps a ', B', C ', D' of the epoxy board as shown in fig. 2 is different, the adjustment of the current larger than two gears can be realized; more specifically, for example, 2 grooves are formed in the epoxy plate air gap a ', 4 grooves are formed in the epoxy plate air gaps B', C ', and D', and other parameters of all the grooves are the same, so that one inductance value corresponds to the epoxy plate air gaps a ', B', C ', and D' when all are unsaturated, one inductance value corresponds to the epoxy plate air gap a 'when saturated, and a third inductance value corresponds to the epoxy plate air gaps B', C ', and D' when saturated, and therefore the three-gear current can be regulated by the reactor; or for example, 2 grooves are formed in the epoxy plate air gap A ', 4 grooves are formed in the epoxy plate air gap B', 8 grooves are formed in the epoxy plate air gaps C 'and D', and other parameters of all the grooves are the same, so that the four-gear current can be regulated by the reactor according to the principle. In the implementation, besides the influence of the number of the grooves, for example, when the number of the grooves is the same, but the grooves are different in size or arrangement, the reactor can correspondingly realize the adjustment of multi-gear current.
The embodiment also discloses a preparation method of the variable inductance reactor, which comprises the following steps:
s1, slotting an epoxy plate air gap 3, and adding a low-saturation magnetic conduction air gap material into the slotting;
specifically, in one embodiment, in order to improve the production efficiency and consistency of the variable inductance reactor, the low-saturation magnetically conductive air gap material may be cured into a block shape by using a mold, and then the block-shaped low-saturation magnetically conductive air gap material is added into the groove 5.
In other embodiments, a low saturation magnetic conductive air gap material may be added into the groove 5, and after curing, the epoxy plate air gap 3 and the discus 4 after processing are placed at intervals to form the iron core column 2.
S2, placing the processed epoxy plate air gap 3 and the discus 4 at intervals to form an iron core column 2;
s3, when a plurality of epoxy plate air gaps 3 are formed in the iron core column 2, aligning and fixing the iron core column 2 by adopting glass fiber ribbons;
and S4, placing the iron core column 2 between the two iron yokes 1 and integrally impregnating the iron core column with resin, and then heating and drying.
In specific implementation, the temperature, time and the like of heating and drying can be referred to the parameters in the production of the conventional reactor.
In the concrete implementation, the iron core column 2 and the two iron yokes 1 can be integrally immersed in resin, then the coils are sleeved, and finally the resin is immersed, so that the noise of the reactor can be reduced; the iron core column 2 can be placed between the two iron yokes 1, then the coils are sleeved, and finally the whole body is immersed in resin, so that the noise of the prepared reactor is larger compared with the former mode.
The working principle of one embodiment of the application is as follows:
the inductance value of the reactor is inversely proportional to the width of the breath, such as the prior art reactor of fig. 1, and comprises two yokes 1, a core limb 2 arranged between the two yokes 1, and a coil (not shown in the figure) sleeved on the core limb 2; the iron core column 2 consists of an epoxy plate air gap 3 and discus 4 which are arranged at intervals. The inductance value Z of the reactor is as follows:
wherein K is a constant coefficient, W is the number of turns of the coil, S is the sectional area of the iron core, and d is the width of the air gap.
Since the constant coefficient K, the number of turns W, and the core cross-sectional area S are all known, this formula can be simplified (the inductance values of the reactors described below are also expressed by simplified formulas):
wherein Z is 1 For the inductance value of the reactor, K 1 Is a constant coefficient, d A 、d B 、d C And d D The width of the air gap A, B, C, D of the epoxy plate is respectively smaller in inductance value of the reactor under the condition of large current, so that the filter effect is better when the reactor is applied to a frequency converter or an inverter. And for small current, the inductance value of the reactor is still unchanged and is smaller, so that the filter effect is poorer when the reactor is applied to a frequency converter or an inverter.
In the reactor of the present application, as shown in fig. 2 and 3, grooves 5 are respectively provided in the air gaps a ', B', C ', D' of the epoxy plates, and the number, the size and the arrangement of the air gaps of the 4 epoxy plates can be adjusted according to the current level to be adjusted so as to meet the requirements.
For example, as described above, when only two-stage current is actually required to be regulated, the number, the size and the arrangement of the grooves 5 on the air gaps a ', B', C ', D' of the epoxy plate can be set to be identical, for example, 2 grooves 5 are provided, when the current is smaller, the low-saturation magnetic conduction air gap material in the grooves 5 on the air gaps a ', B', C ', D' of the epoxy plate is unsaturated, and then the inductance value Z of the reactor is equal 2 The method comprises the following steps:
wherein K is 2 Is the coefficient, d L Representing the corresponding width of the epoxy board air gap except the remainder of the groove 5; at this time will theWhen the reactor is applied to a frequency converter or an inverter, the small current corresponds to the large inductance, so that the filter effect is relatively good. When the current is relatively large, the low saturation magnetic conduction air gap material in the grooves 5 on the epoxy plate air gaps A ', B', C ', D' is saturated, and then the inductance value Z of the reactor is equal to the inductance value Z 3 The method comprises the following steps:
wherein d A′ 、d B′ 、d C′ 、d D′ The widths of the epoxy board air gaps a ', B', C ', D', respectively. From this, Z 3 <Z 2 The reactor has the advantages that the reactor realizes that the large current corresponds to the small inductance, and the filter effect is relatively good when the reactor is applied to a frequency converter or an inverter.
In addition, as described above, if the current of the third gear is actually required to be adjusted, for example, 2 grooves may be disposed on the air gap a 'of the epoxy plate, and 4 grooves are disposed on the air gaps B', C ', and D' of the epoxy plate, and other parameters of all the grooves are the same, so when the current is smaller, the air gaps a ', B', C ', and D' of the epoxy plate are all unsaturated, and at this time, the inductance value of the corresponding reactor is:
wherein K is 3 Is the coefficient, d H Representing the sum of the corresponding widths of all epoxy board air gaps except the remainder of the groove 5; when the reactor is applied to a frequency converter or an inverter, the small current corresponds to the large inductance, so that the filter effect is relatively good. When the current is slightly larger, the epoxy plate air gaps A 'are saturated at the moment, but the epoxy plate air gaps B', C 'and D' are unsaturated, and then the inductance value of the corresponding reactor is as follows:
wherein Z represents the sum of the widths of the epoxy board air gaps B ', C ', D ' except for the remainder of the groove 5, D A′ The width of the epoxy board air gap a' is shown. From this, Z 5 <Z 4 The large current corresponds to the small inductance, and when the reactor is applied to a frequency converter or an inverter, the filtering effect is relatively good. When the current is larger, the air gaps A ', B', C ', D' of the epoxy plates are saturated, and the inductance value of the corresponding reactor is as follows:
at this time, Z 6 <Z 5 I.e. a larger current corresponds to a smaller inductance value, and the filter effect is better when the reactor is applied to a frequency converter or an inverter.
Similarly, 2 grooves can be formed in the epoxy plate air gap A ', 4 grooves are formed in the epoxy plate air gap B', 8 grooves are formed in the epoxy plate air gaps C 'and D', other parameters of all the grooves are the same, and the four-gear current can be regulated when the reactor is applied to a frequency converter or an inverter. Besides the adjustment by the number of the grooves 5, the adjustment of multi-gear current can be realized by the size, arrangement mode and the like of the grooves 5.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape, method and principle of the application are covered by the scope of the application.

Claims (8)

1. A variable inductance reactor, comprising: the coil comprises two iron yokes (1), an iron core column (2) arranged between the two iron yokes (1) and a coil sleeved on the iron core column (2); the iron core column (2) consists of an epoxy plate air gap (3) and discuses (4) which are arranged at intervals; a groove (5) is formed in the epoxy plate air gap (3), and a low-saturation magnetic conduction air gap material is filled in the groove (5);
wherein the thickness of the epoxy plate air gap (3) isd is the diameter of the iron core column (2);
and/or
The adjustment depth of the reactor is adjusted by the area occupation ratio of the groove (5) on the epoxy plate air gap (3); wherein the adjustment depth of the reactor is
2. The variable inductance reactor according to claim 1, characterized in that: the low-saturation magnetic conduction air gap material is prepared from 80% -90% of metal powder and 10% -20% of resin.
3. The variable inductance reactor according to claim 2, characterized in that: the metal powder is formed by mixing 80% -90% of iron powder, 5% -10% of silicon powder and 5% -10% of aluminum powder.
4. The variable inductance reactor according to claim 1, characterized in that: the area ratio of the groove (5) on the epoxy plate air gap (3) is 20% -90%;
and/or
The area of each groove (5) is the total area of the grooves (5)
5. The variable inductance reactor according to claim 1, characterized in that: when the number, the size and the arrangement modes of the grooves (5) on the epoxy plate air gap (3) arranged in the middle of the iron core column (2) are completely consistent, the reactor can correspondingly adjust two-gear current; when the number, the size or the arrangement mode of the grooves (5) on the epoxy plate air gap (3) arranged in the middle of the iron core column (2) are not completely consistent, the reactor can correspondingly adjust more than two current gears.
6. The method for manufacturing a variable inductance reactor according to any one of claims 1 to 5, comprising the steps of:
slotting the epoxy plate air gap (3), and adding a low-saturation magnetic conduction air gap material into the slotting;
placing the processed epoxy plate air gap (3) and discus (4) at intervals to form an iron core column (2);
the iron core column (2) is arranged between the two iron yokes (1) and is integrally immersed in resin, and then heated and dried.
7. The method of manufacturing a variable inductance reactor according to claim 6, wherein the adding of the low saturation magnetic conductive air gap material into the tank comprises:
and solidifying the low-saturation magnetic-conducting air gap material into a block shape by using a die, and then adding the block-shaped low-saturation magnetic-conducting air gap material into the groove (5).
8. The method of manufacturing a variable inductance reactor according to claim 6, wherein when the epoxy board air gap (3) has a plurality, further comprising, before the integral resin dipping: and the iron core column (2) is aligned and fixed by adopting glass fiber ribbons.
CN202211405386.5A 2022-11-10 2022-11-10 Variable inductance reactor and preparation method thereof Active CN115579219B (en)

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CN115579219B true CN115579219B (en) 2023-09-15

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136350A (en) * 2010-01-26 2011-07-27 浙江广天变压器有限公司 Iron core of magnetic screen type magnetically controlled reactor
CN102930957A (en) * 2012-09-27 2013-02-13 江苏锴博材料科技有限公司 Variable-inductance inductive iron core
CN203277035U (en) * 2013-04-15 2013-11-06 深圳顺络电子股份有限公司 Transformer without air gap
CN104505238A (en) * 2015-01-14 2015-04-08 东南大学 Equivalent air gap adjustable reactor
CN109859881A (en) * 2017-11-30 2019-06-07 许继变压器有限公司 Iron core reactor air-gap insulation material, iron core reactor air gap cushion block and iron core reactor
CN111128514A (en) * 2019-12-23 2020-05-08 国网江苏省电力有限公司滨海县供电分公司 Iron core reactor
CN113363059A (en) * 2021-06-07 2021-09-07 东莞铭普光磁股份有限公司 Inductor, power factor correction circuit and electronic equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136350A (en) * 2010-01-26 2011-07-27 浙江广天变压器有限公司 Iron core of magnetic screen type magnetically controlled reactor
CN102930957A (en) * 2012-09-27 2013-02-13 江苏锴博材料科技有限公司 Variable-inductance inductive iron core
CN203277035U (en) * 2013-04-15 2013-11-06 深圳顺络电子股份有限公司 Transformer without air gap
CN104505238A (en) * 2015-01-14 2015-04-08 东南大学 Equivalent air gap adjustable reactor
CN109859881A (en) * 2017-11-30 2019-06-07 许继变压器有限公司 Iron core reactor air-gap insulation material, iron core reactor air gap cushion block and iron core reactor
CN111128514A (en) * 2019-12-23 2020-05-08 国网江苏省电力有限公司滨海县供电分公司 Iron core reactor
CN113363059A (en) * 2021-06-07 2021-09-07 东莞铭普光磁股份有限公司 Inductor, power factor correction circuit and electronic equipment

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