CN115579219A - Variable inductance reactor and preparation method thereof - Google Patents

Variable inductance reactor and preparation method thereof Download PDF

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Publication number
CN115579219A
CN115579219A CN202211405386.5A CN202211405386A CN115579219A CN 115579219 A CN115579219 A CN 115579219A CN 202211405386 A CN202211405386 A CN 202211405386A CN 115579219 A CN115579219 A CN 115579219A
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air gap
epoxy plate
reactor
iron core
variable inductance
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CN115579219B (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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  • 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 epoxy plate air gaps (3) and iron cakes (4) which are arranged at intervals; a groove (5) is formed in the epoxy plate air gap (3), and low-saturation magnetic-conducting air gap materials are filled in the groove (5). The variable inductance reactor in this application can realize that the electric current under a plurality of operating modes corresponds a plurality of inductances to improve the filtering effect of converter or dc-to-ac converter.

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 only has one inductance value, so when the reactor is applied to a frequency converter or an inverter, the filtering effect of the frequency converter or the inverter is good when the current is large, but the filtering effect of the frequency converter or the inverter when the current is small is poor, and further improvement is needed.
Disclosure of Invention
In order to enable the reactor to have a good filtering effect on large current and small current when the reactor is applied to a frequency converter or an inverter, the application provides the variable inductance reactor and the preparation method thereof.
In a first aspect, the application provides a variable inductance reactor, which adopts the following technical scheme:
a variable inductance reactor comprising: the coil 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 iron cakes which are arranged at intervals; the epoxy plate air gap is provided with a groove, and the groove is filled with low-saturation magnetic-conducting air gap materials.
By adopting the technical scheme, the iron core column is arranged between the two iron yokes and consists of the epoxy plate air gaps and the iron cakes which are arranged at intervals, the epoxy plate air gaps are provided with the grooves, and the grooves are filled with the low-saturation magnetic-conduction air gap materials, so that when the 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, and the filtering effect of the frequency converter or the inverter is improved.
Preferably, the low saturation magnetic air gap material is prepared from 80-90% of metal powder and 10-20% of resin. Thereby improving the processing difficulty, and not facilitating the stirring and processing when more resin is used.
Preferably, the metal powder is formed by mixing 80-90% of iron powder, 5-10% of silicon powder and 5-10% of aluminum powder. So that the magnetic saturation can be adjusted according to actual needs.
Preferably, the thickness of the air gap of the epoxy plate is
Figure BDA0003936855760000011
Wherein d is the diameter of the iron core column, so that the production process is good to realize, and the magnetic flux leakage is small; when the thickness of the air gap of the epoxy plate is less than 1mm, the process is not easy to realize, and the production difficulty is high; when the thickness of the air gap of the epoxy plate is larger than that of the air gap
Figure BDA0003936855760000012
In the process, the magnetic flux leakage is too large, so that the electric reactor generates heat seriously.
Preferably, the adjustment depth of the reactor is adjusted by the area ratio of the groove on the air gap of the epoxy plate; wherein the reactor has an adjustment depth of
Figure BDA0003936855760000013
Preferably, the area ratio of the groove on the air gap of the epoxy plate is 20-90%, so that the inductance adjusting depth can reach 2 times; when the area ratio of the groove on the air gap of the epoxy plate is less than 20%, the inductance adjusting depth is insufficient; when the area ratio of the groove on the air gap of the epoxy plate is more than 90%, the strength of the air gap of the epoxy plate is insufficient.
Preferably, the area of each groove is the total area of the grooves
Figure BDA0003936855760000021
Therefore, eddy current can be reduced, and further, the heating of the reactor is reduced; when the area of each groove occupies less than the total area of the groove
Figure BDA0003936855760000022
When the machining is carried out, the machining amount is huge; when the area of each groove accounts for more than the total area of the grooves
Figure BDA0003936855760000023
In this case, an eddy current is easily formed, so that the reactor generates heat seriously.
Preferably, the epoxy plate air gap is formed by overlapping silicon steel sheets arrayed along the horizontal direction; when the number of the grooves is larger than two, the grooves are uniformly distributed in the direction of the horizontal arrangement of the silicon steel sheets, so that overlapping is reduced, and the processing of the air gaps of the epoxy plate is facilitated.
Preferably, when the number, size and arrangement mode of the grooves on the air gaps of the epoxy plates which are arranged at intervals in the iron core column are completely consistent, the electric reactor can correspondingly adjust two levels of current, and a good filtering effect is realized for a certain two levels of current; when the number, size or arrangement mode of the grooves in the air gaps of the epoxy plates which are arranged in the iron core column at intervals are not completely consistent, the reactor can correspondingly adjust the current which is larger than two gears, so that the reactor can adjust multi-gear current when being applied to a frequency converter or an inverter, and a better filtering effect can be realized for the multi-gear current.
In a second aspect, the present application provides a method for manufacturing the variable inductance reactor, which adopts the following technical scheme:
slotting an air gap of the epoxy plate, and adding a low-saturation magnetic-conductive air gap material into the slot;
placing the processed epoxy plate air gap and the discus at intervals to form an iron core column;
the core limb is placed between two yokes and impregnated with resin entirely, and then heated and dried.
By adopting the technical scheme, the variable inductance reactor can be prepared 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 step of adding the low-saturation magnetic-conductive air gap material into the slot comprises the following steps:
and curing the low-saturation magnetic-conductive air gap material into a block by using a mold, and then adding the block low-saturation magnetic-conductive 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 there are a plurality of epoxy board air gaps, before the integral resin impregnation, the method further comprises: the iron core columns are aligned and fixed by adopting the glass fiber ribbons, so that the noise of the reactor in use is reduced.
In summary, the present application includes at least one of the following advantageous technical effects:
1. this application sets up the iron core post between two yokes, and the iron core post comprises epoxy board air gap and discus that the interval was placed simultaneously set up the recess on the epoxy board air gap to pack low saturation magnetic conduction air gap material in the recess, thereby can realize when the reactor is applied to in converter or the 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.
2. In the application, when the number, size and arrangement mode of the grooves on the air gaps of the epoxy plates which are arranged at intervals in the iron core column are completely consistent, the reactor can correspondingly adjust two levels of current, and a good filtering effect is realized for a certain two levels of current; when the number, size or arrangement mode of the grooves in the air gaps of the epoxy plates which are arranged in the iron core column at intervals are not completely consistent, the reactor can correspondingly adjust the current which is larger than two gears, so that the reactor can adjust multi-gear current when being applied to a frequency converter or an inverter, and a better filtering effect can be realized for the multi-gear current.
Drawings
Fig. 1 is a schematic cross-sectional view of a conventional reactor.
Figure 2 is a cross-sectional schematic diagram of a variable inductance reactor in an embodiment of the present application.
FIG. 3 is a schematic diagram of the groove distribution on the air gap of the epoxy plate in an embodiment of the present application.
Description of reference numerals: 1. an iron yoke; 2. a core limb; 3. an epoxy plate air gap; 4. a discus; 5. and (4) a groove.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
Fig. 1 shows a reactor in the prior art, which includes two yokes 1, a core limb 2 disposed between the two yokes 1, and a coil (not shown in the figure) sleeved on the core limb 2, where the core limb 2 is composed of an epoxy plate air gap 3 and a discus 4 disposed at intervals. That is, as the A, B, C, D epoxy plate air gaps 3 shown in fig. 1 are both flat plates, when the reactor is applied to an inverter or an inverter, the reactor has only one fixed inductance value (determined by the epoxy plate air gap) for currents of different working conditions, so that the inverter or the inverter has a relatively good filtering effect for a large current, but has a relatively poor filtering effect for a small current.
In order to solve the above problem, an embodiment of the present application discloses a variable inductance reactor. Referring to fig. 2 and 3, a variable inductance reactor includes: two yokes 1, a core limb 2 disposed between the two yokes 1, and a coil (not shown) fitted around the core limb 2; the iron core column 2 consists of epoxy plate air gaps 3 and iron cakes 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 low-saturation magnetic-conducting air gap materials.
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 thickness of the epoxy plate air gap 3 is
Figure BDA0003936855760000031
Where d is the diameter of the core limb 2. In other embodiments, the thickness of the epoxy plate 3 may take other values.
Optionally, the power is adjusted by the area ratio of the grooves 5 on the air gap 3 of the epoxy plateThe adjustment depth of the reactor; wherein the reactor has an adjustment depth of
Figure BDA0003936855760000041
Any current as referred to herein means a current determined according to actual needs. The magnetic flux of the reactor can be obtained according to the actually required current, the air gap sectional area corresponding to the saturation flux density can be obtained according to the magnetic flux, and the area occupation ratio of the groove 5 on the epoxy plate air gap 3 is further obtained.
In one embodiment, the area of the groove 5 on the air gap 3 of the epoxy plate is 20% to 90%. In other embodiments, the area ratio of the grooves 4 on the epoxy plate 3 may also take other values.
In one embodiment, the area of each groove 5 is the total area of the grooves 5
Figure BDA0003936855760000042
In other embodiments, the ratio of the area of each groove 4 to the total area may take other values.
The shape of the epoxy plate 3 is round or square; the groove 4 is round or square; optionally, in an embodiment, in order to facilitate processing of the plate, the epoxy plate air gap 3 is formed by stacking silicon steel sheets arranged in a horizontal direction; when the number of the grooves 5 is larger than two, the grooves 5 are uniformly distributed in the horizontal arrangement direction of the silicon steel sheets, and overlapping is reduced.
In this embodiment, when the number, size, and arrangement of the grooves 5 on the epoxy plate air gaps 3 placed at intervals in the iron core limb 2 are completely consistent, the reactor can correspondingly adjust two levels of current, that is, for example, as shown in fig. 2, the number, size, and arrangement of the grooves 5 on the epoxy plate air gaps a ', B', C ', and D' are completely consistent, a ', B', C ', and D' are equivalent to series connection, and the corresponding reactor has an inductance value when a ', B', C ', and D' are saturated; when A ', B', C 'and D' are not saturated, the other inductance value is corresponded, so that two levels of current can be adjusted; when the number, size or arrangement mode of the grooves 5 on the epoxy plate air gaps 3 which are arranged in the iron core column 2 at intervals are not completely consistent, the electric reactor can correspondingly adjust more than two levels of current; for example, when the number, size and arrangement of the grooves 5 on the air gaps a ', B', C 'and D' of the epoxy plates in fig. 2 are 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 the epoxy plate air gaps a ', B', C ', and D' are unsaturated, one inductance value corresponds to the epoxy plate air gaps a 'when the epoxy plate air gaps a' are saturated, and a third inductance value corresponds to the epoxy plate air gaps B ', C', and D 'when the epoxy plate air gaps B', C ', and D' are saturated, and thus the reactor can adjust three levels of current; 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 reactor can adjust four-gear current according to the principle. During specific implementation, except for the influence of the number of the grooves, for example, the number of the grooves is the same, but the sizes of the grooves are different or the arrangement modes of the grooves are different, so that the reactor can correspondingly adjust multi-level current.
The embodiment also discloses a preparation method of the variable inductance reactor, which comprises the following steps:
s1, slotting an air gap 3 of an epoxy plate, and adding a low-saturation magnetic-conductive air gap material into the slot;
specifically, in an embodiment, in order to improve the production efficiency and consistency of the variable inductance reactor, the low-saturation magnetic-conductive air gap material may be cured into a block shape by using a mold, and then the block-shaped low-saturation magnetic-conductive air gap material may be added into the groove 5.
In other embodiments, a low saturation magnetic air gap material may be added into the groove 5, and after curing, the processed epoxy plate air gap 3 and the discus 4 are placed at intervals to form the core limb 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 arranged in the iron core column 2, aligning and fixing the iron core column 2 by adopting a glass ribbon;
and S4, placing the iron core column 2 between the two iron yokes 1, impregnating the whole iron core column with resin, and heating and drying the iron core column.
In specific implementation, the temperature, time and the like of heating and drying can refer to parameters in the production of a conventional reactor.
In specific implementation, the iron core column 2 and the two iron yokes 1 can be integrally soaked in resin, then the coil is sleeved, and finally the resin is soaked, so that the noise of the reactor can be reduced; it is also possible to place the core limb 2 between two yokes 1, then to encase the coil, and finally to impregnate the whole with resin, which makes the reactor more noisy than the former.
The working principle of an embodiment of the present application:
the inductance value of a reactor is inversely proportional to the width of the breath, for example, the reactor of the prior art shown in fig. 1 includes two yokes 1, a core limb 2 disposed 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 epoxy plate air gaps 3 and iron cakes 4 which are arranged at intervals. The inductance value Z of the reactor is as follows:
Figure BDA0003936855760000051
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 an air gap.
Since the constant coefficient K, the number of turns of the coil W, and the core sectional area S are known, the formula can be simplified (the inductance value of the following reactor is also expressed by a simplified formula):
Figure BDA0003936855760000052
wherein Z is 1 Is the inductance value of the reactor, K 1 Is a constant coefficient of d A 、d B 、d C And d D The width of the epoxy plate air gap A, B, C, D, respectively, and the reactance is used for large currentThe inductance value of the filter is small, so that the filter effect is good when the filter is applied to a frequency converter or an inverter. In the case of a small current, the inductance value of the reactor is still unchanged and is relatively small, so that the filter effect is relatively poor 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 fig. 3, grooves 5 are provided in the epoxy plate air gaps a ', B', C ', and D', and the number, size, and arrangement of the 4 epoxy plate air gaps can be adjusted to meet the requirements according to the number of current levels to be adjusted.
For example, as described above, when only two levels of current need to be actually adjusted, the number, size, and arrangement of the grooves 5 on the epoxy plate air gaps a ', B', C ', and D' may be completely the same, for example, 2 grooves 5 are provided, when the current is small, the low saturation magnetic conductive air gap material in the grooves 5 on the epoxy plate air gaps a ', B', C ', and D' is not saturated, and then the inductance value Z of the reactor is obtained at this time 2 Comprises the following steps:
Figure BDA0003936855760000061
wherein, K 2 Is a coefficient of d L The width of the air gap of the epoxy plate except the rest part of the groove 5 is shown; when the reactor is applied to a frequency converter or an inverter, the small current corresponds to the large inductance, so that the filtering effect is good. When the current is relatively large, the low-saturation magnetic conducting air gap materials in the grooves 5 on the air gaps A ', B', C 'and D' of the epoxy plates are saturated, and then the inductance value Z of the reactor is obtained 3 Comprises the following steps:
Figure BDA0003936855760000062
wherein d is A′ 、d B′ 、d C′ 、d D′ Indicating the width of the epoxy plate air gaps a ', B', C ', D', respectively. From this, Z 3 <Z 2 Namely, the large current is corresponding to the small inductance, and the reactor is applied to a frequency converter or the inverse frequency converterWhen in a converter, the filtering effect is better.
In addition, as described above, if it is actually necessary to adjust the third-gear current, for example, 2 grooves may be provided on the epoxy plate air gap a ', 4 grooves may be provided on the epoxy plate air gaps B', C ', and D', and other parameters of all the grooves are the same, so when the current is relatively small, the epoxy plate air gaps a ', B', C ', and D' are all unsaturated, and the inductance value of the corresponding reactor at this time is:
Figure BDA0003936855760000063
wherein, K 3 Is a coefficient of d H Representing the sum of the widths of all the epoxy plate air gaps except the width corresponding to the rest part 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 filtering effect is good. When the current is slightly larger, assuming that the epoxy plate air gap a 'is saturated at the time, but the epoxy plate air gaps B', C ', D' are not saturated, the inductance value of the corresponding reactor at the time is:
Figure BDA0003936855760000064
wherein d is K Represents the sum of the widths of the air gaps B ', C ' and D ' of the epoxy plates except for the rest of the groove 5, D A′ The width of the epoxy plate air gap a' is shown. From this, Z 5 <Z 4 And the large current corresponds to a small inductor, and when the reactor is applied to a frequency converter or an inverter, the filtering effect is good. When the current is larger, the air gaps A ', B', C 'and D' of the epoxy plates are saturated, and the inductance value of the corresponding reactor is as follows:
Figure BDA0003936855760000065
at this time, Z 6 <Z 5 I.e. a larger current corresponds to a smaller inductance value, when the reactor is applied to a frequency converter or an inverterAnd in the middle, the filtering effect is better.
By analogy, 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 reactor can be used for adjusting four-gear current when applied to a frequency converter or an inverter. Besides the adjustment by the number of the grooves 5, the adjustment of the multi-level current can also be realized by the size, the arrangement mode and the like of the grooves 5.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes in structure, shape, method and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

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 epoxy plate air gaps (3) and iron cakes (4) which are arranged at intervals; a groove (5) is formed in the epoxy plate air gap (3), and low-saturation magnetic-conducting air gap materials are filled in the groove (5).
2. The variable inductance reactor according to claim 1, characterized in that: the low-saturation magnetic-conductive 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 thickness of the epoxy plate air gap (3) is
Figure FDA0003936855750000011
Figure FDA0003936855750000012
Wherein d is the diameter of the iron core column (2);
and/or
Adjusting the adjusting depth of the reactor through the area ratio of the groove (5) on the epoxy plate air gap (3); wherein the reactor has an adjustment depth of
Figure FDA0003936855750000013
5. The variable inductance reactor according to claim 4, characterized in that: the area of the groove (5) on the epoxy plate air gap (3) accounts for 20% -90%;
and/or
The area of each groove (5) being the total area of the grooves (5)
Figure FDA0003936855750000014
6. The variable inductance reactor according to claim 1, characterized in that: the epoxy plate air gap (3) is formed by overlapping silicon steel sheets arrayed along the horizontal direction; when the number of the grooves (5) is more than two, the grooves (5) are uniformly distributed in the horizontal arrangement direction of the silicon steel sheets, and overlapping is reduced.
7. The variable inductance reactor according to claim 1, characterized in that: when the number, size and arrangement mode of the grooves (5) on the epoxy plate air gaps (3) which are arranged at intervals in the iron core column (2) are completely consistent, the reactor can correspondingly adjust two levels of current; when the number, size or arrangement mode of the grooves (5) on the epoxy plate air gaps (3) which are arranged at intervals in the iron core column (2) are not completely consistent, the electric reactor can correspondingly adjust more than two levels of current.
8. A method for manufacturing a variable inductance reactor according to any one of claims 1 to 7, characterized by comprising the steps of:
slotting an air gap (3) of the epoxy plate, and adding a low-saturation magnetic-conductive air gap material into the slot;
placing the processed epoxy plate air gap (3) and the 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 wholly impregnated with resin, and then is heated and dried.
9. The method for preparing a variable inductance reactor according to claim 8, wherein the step of adding a low saturation permeable air gap material into the slots comprises:
the low saturation magnetic conductive air gap material is solidified into a block by a mould, and then the block low saturation magnetic conductive air gap material is added into the groove (5).
10. The method for manufacturing a variable inductance reactor according to claim 8, wherein when there are a plurality of the epoxy plate air gaps (3), before the integral resin impregnation, the method further comprises: and the iron core columns (2) are aligned and fixed by adopting glass ribbons.
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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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