CN220553347U - Filtering inductor and three-phase inverter - Google Patents

Abstract

The utility model provides a filter inductor and a three-phase inverter, wherein the filter inductor comprises end part magnetic cores, side column magnetic cores and a shared magnetic core, the end part magnetic cores comprise an upper end part magnetic core and a lower end part magnetic core, the upper end part magnetic core is arranged at the upper end part of the side column magnetic core, the lower end part magnetic core is arranged at the lower end part of the side column magnetic core, the side column magnetic cores are distributed in a triangular shape and are used for assembling coil windings, the shared magnetic core is arranged between every two side column magnetic cores, and the upper end and the lower end of the shared magnetic core are respectively contacted with the upper end part magnetic core and the lower end part magnetic core. The solution of the utility model is smaller in volume space, saves material costs and is more advantageous than the prior art in applications in some volume-limited scenarios. The utility model can balance inductance of each phase, and the difficulty of the production control inductance process is low.

Description

Filtering inductor and three-phase inverter

Technical Field

The utility model relates to the technical field of electronic components, in particular to a filter inductor and a three-phase inverter.

Background

In the existing three-phase inverter, the output filter inductor is used for filtering current, ripple in the current is filtered, so that the current quality meets the requirements, referring to fig. 1-4, the output filter inductor is in a three-phase five-column or three-phase seven-column form at present, but the cost is relatively high, the volume space is relatively large, the balance of the inductor is difficult to control during production, the voltage of a power grid is unbalanced due to the difference of inductance values among phases, and the load of the power grid is caused by the fact that the voltage of the power grid is seriously possibly exceeding the national regulation limit value. Therefore, the requirement on equipment regulation and control is higher when the device is used.

Disclosure of Invention

The utility model aims to solve the problem that the output filter inductance in a three-phase inverter is difficult to control the inductance balance during production, and provides a filter inductance and a three-phase inverter.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a filter inductance, includes tip magnetic core, side column magnetic core and sharing magnetic core, the tip magnetic core includes tip magnetic core and lower tip magnetic core, the tip magnetic core set up in the upper end of side column magnetic core, the lower tip magnetic core set up in the lower tip of side column magnetic core, the side column magnetic core is triangular distribution for assembly coil winding, the sharing magnetic core set up in between two liang of side column magnetic core, the upper end and the lower extreme of sharing magnetic core respectively with the upper end magnetic core with the contact of lower tip magnetic core.

In some embodiments, the upper end magnetic core and the lower end magnetic core are respectively divided into three blocks, and the included angle between two side surfaces of each block is 120 degrees.

In some embodiments, the outer edges of each of the end cores are arcuate.

In some embodiments, the common core upper end is sandwiched between the three cores divided by the upper end core, and the common core lower end is sandwiched between the three cores divided by the lower end core.

In some embodiments, the upper and lower end cores are one-piece cores, or any portion of the upper and lower end cores are one-piece cores.

In some embodiments, each leg core is formed by combining more than two segmented cores.

In some embodiments, an air gap piece is disposed between the segmented cores.

In some embodiments, an air gap piece is disposed between the end core and the leg core.

In some embodiments, the common magnetic core is square-shaped and blocky.

The utility model also provides a three-phase inverter comprising the filter inductor.

Compared with the prior art, the utility model has the beneficial effects that: the end magnetic cores are arranged at the upper end part and the lower end part of the side column magnetic core, the side column magnetic cores are distributed in a triangular mode, the shared magnetic cores are arranged between every two side column magnetic cores, the upper end and the lower end of the shared magnetic cores are respectively in contact with the upper end magnetic core and the lower end magnetic core, and compared with the filter inductance of the three-phase seven-column in the prior art, the utility model can be provided with one less magnetic conduction column, and simultaneously the volumes of the upper magnetic block and the lower magnetic block are smaller.

Drawings

Fig. 1 is a prior art three-phase five-pole filter inductor with wound coil windings;

FIG. 2 is a three-phase five-pole filter inductor core of the prior art;

fig. 3 is a prior art five-phase seven-pole filter inductor with a coil winding wound thereon;

FIG. 4 is a prior art five-phase seven-post filter inductor core;

FIG. 5 is a schematic diagram of a filter inductor according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a filter inductor with another view angle according to an embodiment of the present utility model;

FIG. 7 is an exploded view of a filter inductor in an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a filter inductor core assembly in accordance with one embodiment of the present utility model;

FIG. 9 is a schematic diagram of a filter inductor with common magnetic core contacts in an embodiment of the present utility model;

FIG. 10 is a schematic diagram of a filter inductor with common core phase separation in an embodiment of the present utility model;

FIG. 11 is a schematic diagram of a magnetic circuit of the filter inductor of the present utility model in operation;

fig. 12 is a schematic diagram of a magnetic circuit of a filter inductor according to another aspect of the present utility model in operation.

Reference numerals illustrate:

1-end core, 11-upper end core. 12-a lower end magnetic core, 2-a side column magnetic core wound with a coil winding, 21-a coil winding, 22-a side column magnetic core and 3-a common magnetic core.

Detailed Description

The utility model will be further described with reference to the following drawings in conjunction with the preferred embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that, in this embodiment, the terms of left, right, upper, lower, top, bottom, etc. are merely relative terms, or refer to the normal use state of the product, and should not be considered as limiting.

Referring to fig. 5-7, the filter inductor according to the embodiment of the present utility model includes an end core 1, a leg core 22 and a common core 3, where the end core 1 includes an upper end core 11 and a lower end core 12, the upper end core 11 is disposed at the upper end of the leg core, the lower end core 12 is disposed at the lower end of the leg core, the leg cores are distributed in a triangle shape for assembling the coil windings 21, the common core 3 is disposed between every two leg cores 22, and the upper end and the lower end of the common core 3 are respectively in contact with the upper end core 11 and the lower end core 12.

In this embodiment, referring to fig. 7, the upper end core 11 and the lower end core 12 of the filter inductor are respectively divided into three pieces, 6 pieces of end cores are fan-like cores, that is, the included angle between two side faces of each piece of core is 120 ° and the outer edge is arc-shaped, in some embodiments, the outer side shapes of the upper end core and the lower end core are not limited, and the side column core 22 can be covered for magnetic conduction. In this embodiment, the end portions of the middle common core 3 are clamped between two pairs of end portions of the core, the upper end portion of the common core 3 is clamped between two pairs of three cores divided by the upper end portion core 11, the lower end portion of the common core 3 is clamped between two pairs of three cores divided by the lower end portion core 12, and the corresponding upper end portion core 11 and lower end portion core 12 vertically clamp the side column cores 22 on the same side, and the mating surfaces are tightly joined to form a circle. The upper end core 11 is provided at the upper end of the leg core 22, and the lower end core 12 is provided at the lower end of the leg core 22. In the embodiment, the end part magnetic core is made of alloy magnetic powder core or ferrite; in some embodiments, the upper end core 11 and the lower end core 12 are one-piece cores, or any portion of the upper end core 11 and the lower end core 12 is one-piece cores. In this embodiment, the filter inductor includes three leg cores 22 with equal height, which are distributed in a triangle and are used for assembling coil windings, the three leg cores 22 respectively correspond to three windings of three phases, the shape of the leg cores 22 may be cylindrical, elliptic cylindrical or square, each leg core 22 may be composed of a plurality of short leg cores, that is, each leg core 22 may be composed of more than two segmented cores. Referring to fig. 8, in one embodiment, the lower end core is a single piece core, the upper end core is divided into three pieces, and each leg core is formed by combining more than two segmented cores; in some embodiments, an air gap piece can be arranged between the joints of the segmented magnetic core segments, and an air gap piece can also be arranged between the side column magnetic core and the end magnetic core; in this embodiment, the side pillar core 22 is made of alloy magnetic powder core or ferrite. Referring to fig. 9 to 10, in this embodiment, the common core 3 is in a block shape, and three pieces are in contact or separated from each other, and the upper and lower ends of the common core 3 are respectively in fit contact with the upper end core 11 and the lower end core 12. The material of the common magnetic core 3 is an amorphous magnetic core (containing nanocrystalline), a ferrite magnetic core or an alloy magnetic powder core. In order to facilitate the control of the manufacturer and the production process, the upper end core 11 and the lower end core 12 can be unified into the same shape core, the sector is the optimal shape, and the middle common core is generally square block.

The filter inductance of the three-phase (three groups of coil windings) six poles (three middle shared magnetic cores and three side pole magnetic cores) of the embodiment is smaller in volume space, and has more advantages than the prior proposal under the application of some volume limiting scenes. Because the two side column magnetic cores share the middle shared magnetic core, the magnetic core is small in size and low in cost, and obviously one magnetic conduction column is less than the three-phase seven-column scheme, the volumes of the upper magnetic block and the lower magnetic block are smaller, and the material cost is saved. Meanwhile, two sides of each side column magnetic core 2 wound with the coil winding are provided with magnetic conduction sheet blocks (shared magnetic cores), the shared magnetic cores are preferably high-permeability magnetic cores, the magnetic paths of the shared magnetic cores are high in magnetic permeability relative to the side column magnetic cores, the magnetic paths of the shared magnetic cores cannot pass through other upper and lower magnetic cores and other side columns, each phase of inductance is equal to one independent inductance, each shared magnetic core is arranged between two side column magnetic cores in the embodiment, so that each shared magnetic core has the same magnetic flux, and the outermost magnetic core in the prior art corresponds to only one winding magnetic flux, so that the inductance of each phase is balanced relative to the inductance of each phase in the embodiment of the prior art, and the difficulty in production control inductance process is low. Because of the balance of the inductance, the filter inductance of the embodiment is beneficial to the use and control of equipment compared with the prior art. Fig. 11-12 are schematic diagrams of the magnetic circuit of the filter inductor according to the present embodiment, and the application of the present utility model may cover transformers, inductors, and the like.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the utility model, and the same should be considered to be within the scope of the utility model.

Claims (10)

1. The utility model provides a filter inductance, its characterized in that includes tip magnetic core, side column magnetic core and sharing magnetic core, the tip magnetic core includes tip magnetic core and lower tip magnetic core, the tip magnetic core set up in the upper end of side column magnetic core, the lower tip magnetic core set up in the lower tip of side column magnetic core, side column magnetic core is the triangle and distributes for assembly coil winding, the sharing magnetic core set up in between two liang of side column magnetic core, the upper end and the lower extreme of sharing magnetic core respectively with the upper end magnetic core with the contact of lower tip magnetic core.

2. The filter inductor as claimed in claim 1, wherein said upper end core and said lower end core are divided into three pieces, respectively, each having an included angle of 120 ° on both sides.

3. The filter inductor of claim 2 wherein said end core has an arcuate outer edge.

4. The filter inductor as claimed in claim 2, wherein said upper end portion core is divided into three cores each having said common core upper end portion sandwiched therebetween, and said lower end portion core is divided into three cores each having said common core lower end portion sandwiched therebetween.

5. The filter inductor of claim 1, wherein the upper end core and the lower end core are one-piece cores, or any portion of the upper end core and the lower end core is one-piece cores.

6. The filter inductor of claim 1, wherein each leg core is formed by combining two or more segmented cores.

7. The filter inductor of claim 6, wherein air gap pieces are disposed between said segmented cores.

8. The filter inductor of claim 1, wherein an air gap piece is disposed between said end core and said leg core.

9. The filter inductor of claim 1 wherein said common core is square-shaped.

10. A three-phase inverter comprising a filter inductance according to any one of claims 1-9.