CN107068354B

CN107068354B - Three-phase common mode reactor

Info

Publication number: CN107068354B
Application number: CN201611259897.5A
Authority: CN
Inventors: 徐启惠; 曹仲飞; 曹祥雄
Original assignee: SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd
Current assignee: SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd.; Zhejiang yilanke Power Electronics Technology Co.,Ltd.
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2020-08-14
Anticipated expiration: 2036-12-30
Also published as: CN107068354A

Abstract

The invention relates to a three-phase common mode reactor. The three-phase common mode reactor is used in a three-phase inverter circuit with large common mode harmonic content, and can well achieve the effect of filtering common mode harmonics. A three-phase common mode reactor comprising: the coil winding device comprises an upper iron yoke, two iron core columns wound with coils and a lower iron yoke, wherein the two iron core columns wound with the coils are arranged between the upper iron yoke and the lower iron yoke in parallel; each iron core column wound with the coils is respectively wound with three coils with the same number of turns, the coils are insulated from each other, and a group of homonymous ends of the three coils on one iron core column are respectively connected with a group of heteronymous ends of the three coils on the other iron core column.

Description

Three-phase common mode reactor

Technical Field

The invention relates to power equipment, in particular to a three-phase common mode reactor.

Background

In a common three-phase inverter output circuit, the proportion of zero sequence components is small, and only a three-phase sine wave filter reactor needs to be connected to the output side of an inverter. When the common-mode harmonic content in some special three-phase inverter circuits is high, the conventional three-phase reactor cannot generate large common-mode inductance to play a role in filtering the common-mode harmonic.

A conventional three-phase reactor is composed of three iron core columns wound with coils, an upper iron yoke and a lower iron yoke. According to the conventional method, an annular magnetic core is additionally arranged on a three-phase wire, but the magnetic conductivity of the annular magnetic core is relatively low, and the common-mode inductance is difficult to be large; and the annular magnetic core is sleeved on the cable and is not easy to fix, so that the reactor with the annular magnetic core can only be adopted when the required common-mode inductance is small. When the three-phase circuit contains higher zero-sequence common-mode components, the vector sum of the magnetic fluxes in the three iron core columns wound with the coils is not zero, and zero-sequence common-mode harmonics cannot be filtered by using a conventional three-phase reactor. If a three-phase four-column reactor, a three-phase five-column reactor or three single-phase reactors are used instead, although zero-sequence common-mode inductance can be generated, the common-mode inductance is equivalent to three-phase differential-mode inductance, and the inductance required for filtering the common-mode harmonic content in the circuit is difficult to meet.

Disclosure of Invention

The invention aims to provide a three-phase common-mode reactor which is used in a three-phase inverter circuit with high common-mode harmonic content and can well achieve the effect of filtering common-mode harmonics.

The purpose of the invention is realized as follows:

a three-phase common mode reactor comprising: the coil winding device comprises an upper iron yoke, two iron core columns wound with coils and a lower iron yoke, wherein the two iron core columns wound with the coils are arranged between the upper iron yoke and the lower iron yoke in parallel; each iron core column wound with the coils is respectively wound with three coils with the same number of turns, the coils are insulated from each other, and a group of homonymous ends of the three coils on one iron core column are respectively connected with a group of heteronymous ends of the three coils on the other iron core column.

Wherein, every be around being wound with three coil respectively by interior to exterior on the iron core post that has the coil: the coil comprises an inner coil, a middle coil and an outer coil, wherein a group of homonymous ends on the outer coil, the middle coil and the inner coil on one iron core column are respectively connected with a group of synonym ends on the inner coil, the middle coil and the outer coil on the other iron core column.

Or, three coils may be wound on each of the core legs wound with coils in an upper, middle and lower arrangement, and a group of homonymous terminals of the three coils on one core leg is respectively connected with a group of synonym terminals of the three coils on another core leg.

When the capacity of the three-phase common mode reactor is small, a three-phase coil can be wound on one iron core column, and then the three-phase common mode reactor comprises: the coil winding iron core column and the two side yokes are arranged between the upper iron yoke and the lower iron yoke; and the iron core columns wound with the coils are respectively wound with three coils with the same number of turns, the coils are insulated from each other, and the terminal ends of the three coils are respectively connected with A, B, C phases of the inverter.

The iron core column wound with the coils is respectively wound with three coils from inside to outside, the coils are insulated from each other, and the wiring terminals of the three coils are respectively connected with A, B, C phases of the inverter.

Or, three coils can be wound on the core limb with the coils in an upper, middle and lower arrangement mode, the coils are insulated from each other, and the terminals of the three coils are respectively connected with A, B, C phases of the inverter.

In the three-phase common mode reactor, the core limb is preferably a silicon steel core limb. The silicon steel is used as the magnetic core, so that the magnetic conductivity of the silicon steel is high, the common-mode inductance is large, the size is small, the installation is convenient, and the structure is firm.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the three-phase common mode reactor provided by the invention only has common mode inductance and does not have differential mode inductance. On one hand, the common-mode inductance can be determined according to the circuit requirements, the inductance is made to be very large in a small space, and the common-mode current on a loop is limited in a very small range; on the other hand, the common mode inductance of the reactor is equivalent to the three-phase differential mode inductance, so that the common mode current cannot be further reduced, and a certain differential mode voltage drop exists, so that the output voltage is reduced. The inverter has the advantages that the output comprehensive performance of the inverter can be improved, the size of the reactor can be designed to be smaller, the weight of equipment is reduced, the installation space is reduced, materials are saved, and the cost is reduced. The common-mode harmonic filter is used in a three-phase inverter circuit with large common-mode harmonic content, and can well filter the common-mode harmonic.

Drawings

Further advantages and characteristics of the invention are illustrated by the following description of an embodiment thereof, given by way of example and not of limitation, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a preferred embodiment of a three-phase common mode reactor according to the present invention.

Fig. 2 is a side view of the embodiment shown in fig. 1.

Fig. 3 is a schematic diagram of the coil structure of the embodiment shown in fig. 1.

Fig. 4 is a schematic structural diagram of another preferred embodiment of the three-phase common mode reactor according to the invention.

FIG. 5 is a side view of the embodiment shown in FIG. 4.

Fig. 6 is a schematic diagram of the coil structure of the embodiment shown in fig. 4.

Detailed Description

A three-phase common mode reactor as shown in fig. 1 to 3, comprising: an upper yoke 1, two legs 2 wound with a coil 4, and a lower yoke 3, the two legs 2 being arranged in parallel between the upper yoke 1 and the lower yoke 3. Each iron core column 2 is wound with three coils from inside to outside respectively: an inner coil 41, a middle coil 42, an outer coil 43, the three coils having the same number of turns, and an insulating layer is provided between the coils so as to be insulated from each other. The group of homonymous terminals on the outer coil 43, the middle coil 42 and the inner coil 41 of one of the core legs 2 are respectively connected with the group of heteronymous terminals on the inner coil 41, the middle coil 42 and the outer coil 43 of the other core leg 2.

Or, the coils on each core limb can also be wound in an upper, middle and lower arrangement mode, wherein a group of homonymous terminals on three coils on one core limb are respectively connected with a group of synonym terminals on three coils on the other core limb.

In this embodiment, the core limb is a silicon steel core limb.

In another embodiment, as shown in fig. 4-6, in this embodiment, the capacity of the three-phase common mode reactor is small, and the three-phase coil can be wound on one core limb 2. As shown in the figure, the three-phase common mode reactor includes an upper iron yoke 1, a core limb 2 wound with a coil 4, a lower iron yoke 3, and two side yokes 5, and the core limb 2 and the two side yokes 5 are disposed between the upper iron yoke 1 and the lower iron yoke 3. The iron core column 2 is respectively wound with three coils from inside to outside: an inner coil 41, a middle coil 42, an outer coil 43, the three coils having the same number of turns, and an insulating layer is provided between the coils so as to be insulated from each other. The terminals of the three coils are respectively connected with A, B, C phases of the inverter.

Alternatively, the core limb 2 can be wound in an upper, middle and lower arrangement mode, the coils are insulated from each other, and the terminals of the three coils are respectively connected with A, B, C phases of the inverter.

In this embodiment, the core limb is a silicon steel core limb.

Although the present invention has been described in terms of the preferred embodiments, it is not intended that the scope of the invention be limited to the exact construction described above, and equivalent alternate constructions will occur to those skilled in the art upon reading the foregoing description and are intended to be encompassed by the present invention unless they depart from the spirit and scope of the invention.

Claims

1. A three-phase common mode reactor, comprising: the coil winding device comprises an upper iron yoke, two iron core columns wound with coils and a lower iron yoke, wherein the two iron core columns wound with the coils are arranged between the upper iron yoke and the lower iron yoke in parallel; each iron core column wound with the coils is respectively wound with three coils with the same number of turns, the coils are insulated from each other, a group of homonymous ends of the three coils on one iron core column are respectively connected with a group of heteronymous ends of the three coils on the other iron core column, and the wiring terminals of the three coils are respectively connected with A, B, C phases of the inverter; the three-phase common mode reactor only has common mode inductance and does not have differential mode inductance.

2. A three-phase common mode reactor according to claim 1, characterized in that: each iron core column wound with coils is respectively wound with three coils from inside to outside: the coil comprises an inner coil, a middle coil and an outer coil, wherein a group of homonymous ends on the outer coil, the middle coil and the inner coil on one iron core column are respectively connected with a group of synonym ends on the inner coil, the middle coil and the outer coil on the other iron core column.

3. A three-phase common mode reactor according to claim 1, characterized in that: three coils are wound on each iron core column wound with the coils in an upper, middle and lower arrangement mode, and a group of homonymous terminals on the three coils on one iron core column are respectively connected with a group of heteronymous terminals on the three coils on the other iron core column.

4. A three-phase common mode reactor according to any one of claims 1 to 3, characterized in that: the iron core column is a silicon steel iron core column.

5. A three-phase common mode reactor, its characterized in that: when the capacity of the three-phase common mode reactor is small, the three-phase common mode reactor comprises the following components: the coil winding iron core column and the two side yokes are arranged between the upper iron yoke and the lower iron yoke; three coils with the same number of turns are respectively wound on the iron core column wound with the coils, the coils are insulated from each other, and the terminal ends of the three coils are respectively connected with A, B, C phases of the inverter; the three-phase common mode reactor only has common mode inductance and does not have differential mode inductance.

6. The three-phase common mode reactor according to claim 5, characterized in that: the iron core column wound with the coils is respectively wound with three coils from inside to outside, the coils are insulated from each other, and the wiring terminals of the three coils are respectively connected with A, B, C phases of the inverter.

7. The three-phase common mode reactor according to claim 5, characterized in that: three coils are wound on the iron core column with the coils in an upper, middle and lower arrangement mode, the coils are insulated from each other, and the terminals of the three coils are respectively connected with A, B, C phases of the inverter.

8. A three-phase common-mode reactor according to any one of claims 5 to 7, characterized in that: the iron core column is a silicon steel iron core column.