CN218826555U

CN218826555U - Variable inductance reactor

Info

Publication number: CN218826555U
Application number: CN202222996786.XU
Authority: CN
Inventors: 于良中; 欧阳乾赞; 黄文进; 冯亚明; 吴景营
Original assignee: Guangdong Guangda Electrical Co ltd
Current assignee: Guangdong Guangda Electrical Co ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-04-07
Anticipated expiration: 2032-11-10

Abstract

The application relates to a variable inductance reactor, including: 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) comprises a common discus (3) and a discus (4) with an air gap, and an epoxy plate air gap (5) is further arranged between the common discus (3) and the discus (4) with the air gap. This application sets up the discus of taking the air gap at the iron core post, realizes adjusting the inductance of reactor through the saturation of adjusting the air gap in the discus of taking the air gap to when making this reactor be applied to converter or dc-to-ac converter, under different work condition, all have better filtering effect to heavy current or undercurrent.

Description

Variable inductance reactor

Technical Field

The application relates to the field of reactors, in particular to a variable inductance reactor.

Background

The existing electric reactor is divided into the following parts according to the structure and cooling media: hollow, core, dry, oil-immersed, etc.

The existing iron core type reactor is generally composed of an iron yoke and an iron core column, wherein the iron core column is composed of epoxy plate air gaps and iron cakes which are arranged at intervals, and the epoxy plate air gaps are in a flat plate shape.

SUMMERY OF THE UTILITY MODEL

The application provides a variable inductance reactor in order to solve the problems that when the existing iron core reactor is applied to a frequency converter or an inverter, the filtering effect on large current is good, but the filtering effect on small current is poor.

The application provides a variable inductance reactor adopts 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 comprises a common discus and a discus with an air gap, and an epoxy plate air gap is arranged between the common discus and the discus with the air gap.

By adopting the technical scheme, the iron core column is provided with the discus with the air gap, and the inductor of the reactor is adjusted by adjusting the saturation of the air gap in the discus with the air gap, so that the reactor has a good filtering effect on large current or small current under different working conditions when being applied to a frequency converter or an inverter.

Preferably, the discus with air gap, the air gap of the epoxy plate and the common discus are sequentially arranged into a group from top to bottom, and the iron core column comprises one or more combinations formed by the discus with air gap, the air gap of the epoxy plate and the common discus.

By adopting the technical scheme, the inductance of the reactor can be adjusted, and meanwhile, the heat dissipation effect of the reactor is improved.

Preferably, if a plurality of sets of sequentially arranged discus with air gaps, epoxy board air gaps and common discus are included, the shape and size of the air gaps in the discus with air gaps in each set are completely the same, or several of the air gaps in each set are the same, or each air gap is different. The shape of the air gap includes a different number of steps.

By adopting the technical scheme, the air gap can be set according to the step number of the current required to be adjusted from the shape and the size of the air gap, and the air gap is simple and easy to implement.

Preferably, the air gap in the discus with the air gap is in an inverted step shape.

By adopting the technical scheme, the air gap in the discus with the air gap is in the shape of the inverted ladder, so that the electric reactors matched with different current gear requirements can be rapidly arranged through the height and the number of layers of the ladder.

Preferably, the air gaps in the air-gap discus comprise 2-5 steps.

By adopting the technical scheme, the requirement for regulating the inductance according to the current can be met, the production difficulty and the production cost are reduced, and the noise of the reactor in use is reduced. When the air gap exceeds 5 steps, the processing cost of the corresponding discus and the air gap material is high, the processing precision requirement on the air gap material is higher, and if the embedding matching degree is not good, larger noise can be generated.

Preferably, the air gap steps in the discus with the air gap are the same in length.

By adopting the technical scheme, the air gap can be better matched with the discus part, and the production cost of the discus with the air gap is reduced.

Preferably, the height of the step of the air gap in the discus with the air gap is

d is the diameter of the core limb. Thereby the production process is well realized,and the magnetic leakage is less, so that the heating of the reactor is less. When the depth of the groove is less than 0.5mm, the process is not well realized, and the production difficulty is high; when the depth of the groove is greater than->

In the meantime, the magnetic flux leakage is too large, resulting in serious heating of the reactor.

Preferably, in the discus with the air gap, the shape of the air gap is matched with that of the discus, and the air gap and the discus are mutually embedded.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the iron core column is provided with the discus with the air gap, and the inductor of the reactor is adjusted by adjusting the saturation of the air gap in the discus with the air gap, so that the reactor has a good filtering effect on large current or small current under different working conditions when being applied to a frequency converter or an inverter.

2. In this application, take discus, epoxy plate air gap and ordinary discus of air gap from top to bottom set gradually a set of, the iron core post include one or more by the combination that discus, epoxy plate air gap and ordinary discus of taking the air gap formed. Therefore, the adjustable inductance of the reactor can be realized, and the heat dissipation effect of the reactor is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a reactor in the related art.

Fig. 2 is a schematic sectional view of a reactor according to an embodiment of the present application.

Description of reference numerals: 1. an iron yoke; 2. a core limb; 3. a plain discus; 4. -a discus with an air gap; 5. epoxy plate air gap.

Detailed Description

The present application is described in further detail below with reference to fig. 1-2.

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 5 and a common discus 3 disposed at intervals. That is, as shown in fig. 1, the air gaps 5 of the epoxy plates a, B, C and D are flat, so when the reactor is applied to the frequency converter or the inverter, the reactor has only one fixed inductance value (determined by the air gaps of the epoxy plates) when the current of different working conditions is applied, and therefore, the frequency converter or the inverter has a relatively good filtering effect when the current is large, but has a relatively poor filtering effect when the current is small.

In order to solve the problem that exists among the prior art, realize under different work condition, according to the size of the big or small adaptability adjustment reactor inductance value of electric current for when being applied to converter or inverter with this reactor, all have better filtering effect to big or small electric current, this application embodiment discloses a variable inductance reactor. Referring to fig. 2, a variable inductance reactor includes: 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 comprises a common discus 3 and a discus 4 with an air gap, and an epoxy plate air gap 5 is further arranged between the common discus 3 and the discus 4 with the air gap. In the discus 4 with the air gap, the shape of the air gap is matched with that of the discus, and the air gap and the discus are mutually embedded.

In order to improve the heat dissipation performance of the reactor at the same time, in one embodiment, the discus 4 with air gap, the epoxy plate air gap 5 and the common discus 3 are sequentially arranged as a group from top to bottom, and the core limb 2 includes one or more combinations formed by the discus 4 with air gap, the epoxy plate air gap 5 and the common discus 3. In other embodiments, the common discus 3, the epoxy plate air gap 5 and the discus 4 with the air gap can be arranged in a group in sequence.

In one embodiment, the air gap in the discus 4 with the air gap is in an inverted step shape. In other embodiments, the air gap in the air-gap discus 4 can be set to other shapes.

In specific implementation, if the air-gap discus comprises a plurality of groups of sequentially arranged discus 4 with air gaps, epoxy plate air gaps 5 and common discus 3, the shapes and sizes of the air gaps in the discus 4 with air gaps in each group are completely the same, or several of the air gaps in each group are the same, or each air gap is different. For example, if the current step number to be adjusted is four, the air gaps in the discus 4 with air gaps can be provided with three layers of steps, and the air gaps in the discus 4 with air gaps are completely consistent in setting conditions; or two layers of steps are arranged on the air gaps in a plurality of discus 4 with air gaps, the air gaps in the remaining discus 4 with air gaps are arranged in other shapes, the saturation of the air gaps is different from that of the air gaps of the two layers of steps, or three layers of steps are arranged on the air gaps in the remaining discus 4 with air gaps, and the parameters of the two layers of steps are consistent with those of the two layers of steps arranged in other air gaps; or the air gaps in the three discus 4 with air gaps are set to be different air gap shapes and/or sizes, the saturation of the air gaps is ensured to be different, and the like. Set up through above mode, realize under different work condition, adjust the inductance value size of reactor according to the size of electric current to all have better filtering effect to big electric current when being applied to converter or dc-to-ac converter with this reactor.

In one embodiment, in order to reduce the production difficulty and cost and reduce the noise of the reactor in use, the air gap in the discus with the air gap 4 can comprise 2-5 steps. In other embodiments, the air gap in the discus 4 with an air gap can also be provided with more than 6 steps.

In order to reduce the production difficulty, in one embodiment, the air gap of the discus 4 with the air gap has the same step length. In other embodiments, the step lengths of the air gaps in the air-gap discus 4 can be set to be different.

Furthermore, in one embodiment, the height of the step of the air gap in the air-gap discus 4 can be set as

d is the diameter of the core limb. In other embodiments, the height of the step of the air gap in the discus 4 with an air gap can also be greater than +>

Or less than 0.5mm。

The implementation 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, for example, as shown in fig. 1, the reactor of the prior art 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 5 and a common discus 3 disposed at an interval.

Inductance value Z of the reactor ₁ Is composed of

Wherein K ₁ Is a coefficient of d _A 、d _B 、d _C And d _D The widths of the air gaps 5 of the epoxy plates A, B, C and D are respectively, and the inductance value of the reactor is smaller when the large current is applied, so that the filter effect is better when the reactor is applied to a frequency converter or an inverter. In the case of a small current, the inductance value of the reactor remains 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 present application, referring to fig. 2, the core limb 2 includes a common discus 3 and a discus 4 with an air gap, an epoxy plate air gap 5 is further disposed between the common discus 3 and the discus 4 with the air gap, and according to the number of current steps to be adjusted, the shape and size of the air gap in the discus 4 with the air gap can be adjusted to adjust the saturation of the air gap, so that the reactor can correspond to different inductances under different currents.

For example, when three levels of current need to be adjusted actually, the shape of the air gap in the discus with air gap 4 can be set to be a two-step reverse step shape as shown in fig. 2, and the core limb 2 includes four sets of discus with air gap 4, an epoxy plate air gap 5 and a common discus 3, and the air gaps in the four discus with air gap 4 are completely the same.

Then when the current is small, for example 10-100A, and the air gaps in the four air-gap discuses 4 are not saturated, then the inductance Z of the reactor is obtained ₂ Comprises the following steps:

wherein, K ₂ Is a coefficient of d _A′ 、d _B′ 、d _C′ 、d _D′ The widths of the epoxy plate air gaps 5 are A ', B', C 'and D', respectively. When the reactor is applied to a frequency converter or an inverter, a small current corresponds to a large inductance (with respect to the following Z) ₃ And so the filtering effect is better. When the current is slightly larger, for example 100-150A, the first step (i.e. the narrower step) in the air gap in the air-gap discus 4 saturates, and then the inductance Z of the reactor is obtained ₃ Comprises the following steps:

wherein, d ₁ Is the thickness of the first step in the air gap in the air-gapped discus 4. From this, Z ₃ <Z ₂ The electric reactor realizes that large current corresponds to small inductance, and has better filtering effect when being applied to a frequency converter or an inverter. When the current is larger, for example 150-200A, the first step and the second step in the air gap in the discus 4 with the air gap are saturated, and then the inductance value Z of the reactor is obtained at the moment ₄ Comprises the following steps:

by analogy, if the four-level current needs to be adjusted, the air gaps in the discus 4 with the air gaps can be arranged in a three-step shape, and the reactor can correspond to a plurality of inductance values for a plurality of levels of current when being applied to a frequency converter or an inverter by adjusting the air gap materials or the difference in shape and size of the plurality of discus 4 with the air gaps, so that the reactor has a good filtering effect for large current and small current.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

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) comprises a common discus (3) and a discus (4) with an air gap, and an epoxy plate air gap (5) is further arranged between the common discus (3) and the discus (4) with the air gap.

2. The variable inductance reactor according to claim 1, characterized in that: the iron core column (2) comprises one or more combinations formed by the iron cakes (4) with air gaps, the epoxy plate air gaps (5) and the common iron cakes (3).

3. The variable inductance reactor according to claim 1, characterized in that: if the air-gap-bearing discus comprises a plurality of groups of sequentially arranged discus (4) with air gaps, epoxy plate air gaps (5) and common discus (3), the shapes and the sizes of the air gaps in the discus (4) with the air gaps in each group are completely the same or a plurality of the air gaps in each group are the same or all the air gaps are different.

4. The variable-inductance reactor according to claim 1, characterized in that: the air gap in the discus (4) with the air gap is in an inverted step shape.

5. The variable-inductance reactor according to claim 4, characterized in that: the air gap in the discus (4) with the air gap comprises 2-5 layers of steps.

6. The variable inductance reactor according to any one of claims 1 to 5, characterized in that: the stepped lengths of the air gaps in the discus (4) with the air gaps are the same.

7. A variable inductance reactor according to any one of claims 1 to 5,it is characterized in that the height of the step of the air gap in the discus (4) with the air gap is

d is the diameter of the core limb.

8. The variable inductance reactor according to claim 1, characterized in that: in the discus (4) with air gaps, the shape of the air gaps is matched with that of the discus, and the air gaps are mutually embedded.