CN213070768U

CN213070768U - Combined magnetic core, three-phase reactor inductance magnetic core and three-phase reactor

Info

Publication number: CN213070768U
Application number: CN202022089219.7U
Authority: CN
Inventors: 屈子铎
Original assignee: Shanxi Zhongci Shangshan Technology Co ltd
Current assignee: Shanxi Zhongci Shangshan Technology Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-04-27
Anticipated expiration: 2030-09-22

Abstract

The utility model relates to a reactor technical field, concretely relates to combination magnetic core and three-phase reactor inductance magnetic core and three-phase reactor. The utility model provides a three-phase reactor inductance magnetic core, is mainly by the horizontal "day" style of calligraphy structure that upper yoke portion, lower yoke portion and three core leg are constituteed, the core leg is the cylinder, mainly forms by a plurality of cylinder magnetic path axial combination. The utility model discloses a magnetic core structure group to among the prior art improves, changes the cross-sectional geometry of magnetic core wherein into circularly to gain the minimum wire length of each circle, falls to the minimum with the wire quantity, thereby effective reduce cost.

Description

Combined magnetic core, three-phase reactor inductance magnetic core and three-phase reactor

Technical Field

The utility model relates to a reactor technical field, concretely relates to combination magnetic core and three-phase reactor inductance magnetic core and three-phase reactor.

Background

Reactors, also called inductors, are electrical conductors that, when energized, generate a magnetic field in a certain spatial area occupied by the conductor, so that all electrical conductors capable of carrying current are inductive in a general sense. However, the inductance of the electrified long straight conductor is small, and the generated magnetic field is not strong, so that the actual reactor is in a mode that a conducting wire is wound into a solenoid, and is called as an air-core reactor; sometimes, in order to make this solenoid have a larger inductance, a magnetic core is inserted into the solenoid. Reactance is divided into inductive reactance and capacitive reactance, and the more scientific classification is that inductive reactance (inductor) and capacitive reactance (capacitor) are collectively called reactor, however, since the inductor is existed in the past and is called reactor, the capacitor is called reactor now, and the reactor is specially called inductor.

In a general industrial system for high power application, three-phase ac is a preferred choice for energy efficiency and stability, and is commonly found in motors, compressors, frequency converters, inverters, charging piles, communication power supplies, and the like. The trace of the three-phase reactor is commonly found in the requirements of power factor correction, electromagnetic noise suppression, current ripple control and the like. In the design specification of the three-phase reactor, the inductance values of the three groups of coils must be controlled within a certain difference range. The conventional three-phase reactor has an E + E-type magnetic core combination mode, and the high inductance of the middle coil is adjusted by forming an air gap in the middle of the middle magnetic pole or by using a spacer to separate the air gap at three joint surfaces. The phenomenon that the inductance of the middle coil is higher is that the magnetic path of the magnetic flux excited by the magnetomotive force of the middle coil is different from the magnetic path of the magnetic flux excited by the magnetomotive force of the two coils at the outer side, the magnetic resistance of the magnetic path excited by the middle coil is lower than that of the outer coil, and the inductance is higher when the magnetic resistance is lower, so that the air gap of the center pillar is used for increasing the magnetic resistance of the magnetic path excited by the middle coil so as to achieve the purpose of reducing the inductance. However, at the air gap edges the flux spreads out, i.e. spreads the flux. The magnetic flux is generated by air gap magnetic potential, appears in a magnetic core window, and cuts a conductor in the window close to the air gap at high frequency to cause eddy current loss, so that the temperature rise of the conductor in the area is too high, and the service life of the reactor is shortened.

In order to solve the above problems, the present applicant has disclosed an inductance balance magnetic core and a three-phase reactor (CN 209357573U) of a three-phase reactor in the utility model previously applied, wherein three groups of vertical magnetic pillars are vertically divided into a plurality of layers, each layer is a plurality of magnetic blocks and is arranged in an array, and wherein the magnetic pillars are square or rectangular pillars. There is a demonstration in mathematical geometry that: the perimeter of a square is smaller than the perimeter of a rectangle, and the perimeter of a circle is smaller than the perimeter of a square, for the same area. Since the wire is wound around one turn in relation to the circumference of the cross-sectional geometry of the vertical pole, it can be seen that the core structure in the aforementioned utility model patent (CN 209357573U) fails to achieve a reduced amount of benefit in the amount of wire length used.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a combination magnetic core and three-phase reactor inductance magnetic core and three-phase reactor, the utility model discloses a magnetic core structure group to among the prior art improves, changes the cross-sectional geometry of magnetic core wherein into circularly to gain each minimum wire length of circle, with the wire quantity reduce to minimum, thereby effective reduce cost.

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

a composite magnetic core, comprising: the combined magnetic core is mainly formed by axially combining a plurality of cylindrical magnetic blocks.

Furthermore, the two ends of the combined magnetic core are respectively provided with an end magnetic block, the end face of the combined magnetic core is right opposite to the center of the end face of the end magnetic block, and the end magnetic block completely covers the end face of the combined magnetic core.

Furthermore, the end faces of the end magnetic blocks are rectangular, wherein any side length of the rectangle is larger than the diameter of the combined magnetic core.

The utility model provides a three-phase reactor inductance core, mainly by the horizontal "day" style of calligraphy structure that upper yoke portion, lower yoke portion and three core leg constitute, its characterized in that: the magnetic core column is a cylinder and mainly formed by axially combining a plurality of cylindrical magnetic blocks.

Furthermore, the upper yoke part and the lower yoke part are respectively divided into three yoke part magnetic blocks along the length direction, and the three yoke part magnetic blocks respectively correspond to the three magnetic core columns.

Furthermore, a gasket is arranged on one side, facing the magnetic core column, of the middle yoke magnetic block, and gaskets are also arranged on the sides, facing away from the magnetic core column, of the yoke magnetic blocks on the two sides.

Furthermore, the end face of the yoke magnetic block is rectangular, the end face of the magnetic core column is opposite to the center of the end face of the yoke magnetic block, and any side length of the rectangle is larger than the diameter of the magnetic core column.

Further, any side length of the rectangle is larger than the outer diameter of the coil wound on the magnetic core column.

Furthermore, the yoke magnetic block is formed by combining a plurality of magnetic blocks.

A three-phase reactor comprises the three-phase reactor inductance magnetic core.

The utility model has the advantages that:

(1) the utility model discloses a magnetic core structure group to among the prior art (utility model discloses a CN 209357573U) improves, changes the cross-sectional geometry of three vertical magnetic poles of group wherein into circularly to gain each circle minimum wire length, so can reduce the copper line quantity of three group's coils to minimum, thereby effectively reduce three-phase reactor's cost.

(2) The utility model discloses what will go up yoke portion size setting is big than the core column terminal surface, covers the core column terminal surface moreover totally, and upper and lower yoke portion can increase the effect that shields to the coil magnetism, and then the local inductance that increases realizes under the condition that does not increase the coil number of turns, the local inductance that increases.

Drawings

Fig. 1 is a schematic view of a composite magnetic core.

Fig. 2 is a schematic front view of a three-phase reactor inductor core.

Fig. 3 is a side schematic view of a three-phase reactor inductor core.

Fig. 4 is a schematic cross-sectional view of a three-phase reactor inductor core.

Fig. 5 is an assembly schematic of a three-phase reactor inductor core.

Fig. 6 is a schematic front view of a three-phase reactor.

Fig. 7 is a side schematic view of a three-phase reactor.

In the figure: 1. the magnetic core comprises an upper yoke part, 2 a lower yoke part, 3 a magnetic core column, 4 a gasket, 5 a coil, 6 a cylindrical magnetic block, 7 a container, 8 and a screw rod.

Detailed Description

In order to better understand the present invention, the technical solution of the present invention is further described below with reference to the following embodiments.

Example one

As shown in FIG. 1, a combined magnetic core is a cylinder, and is mainly formed by axially combining five cylindrical magnetic blocks 6. The specific number of the cylindrical magnetic blocks 6 can be determined according to the specific requirements and the size of the magnetic core, the universality is improved, and the using amount of conducting wires can be reduced due to the circular combined magnetic core.

The magnetic core comprises a combined magnetic core and is characterized in that end part magnetic blocks are arranged at two ends of the combined magnetic core respectively, the end face of the combined magnetic core is opposite to the center of the end face of each end part magnetic block, and the end part magnetic blocks completely cover the end face of the combined magnetic core. The end magnetic block is of a cuboid structure with a square cross section and can be formed by gluing two smaller strip-shaped magnetic blocks, wherein the side length of the square cross section is larger than the diameter of the combined magnetic core. The effect of magnetic shielding of the coil 5 can be increased by the large end magnetic block, and therefore inductance is locally increased under the condition that the number of turns of the coil 5 is not increased.

Example two

As shown in fig. 2, the three-phase reactor inductance core is a transverse structure in a shape of a Chinese character ri, which is mainly composed of an upper yoke 1, a lower yoke 2 and three core legs 3.

As shown in fig. 2, 3 and 4, the magnetic core column 3 is a cylinder with a diameter D, and is mainly formed by axially combining five cylindrical magnetic blocks 6, and the diameter of each cylindrical magnetic block 6 is also D.

As shown in fig. 2 and 4, each of the upper yoke portions 1 (the lower yoke portion 2 and the upper yoke portion 1) is divided into three yoke magnetic blocks in the length direction, and the three yoke magnetic blocks correspond to the three core legs 3, respectively.

And a spacer 4 is arranged on one side of the magnetic block of the middle yoke part, which faces the magnetic core column 3, and an air gap is formed for the middle magnetic core column 3, so that the inductances of the three groups of coils reach a balanced state. The air gap generated by the gasket 4 is positioned at the outer side of the coil 5, so that the influence of the diffused magnetic flux effect at the edge of the air gap on the coil 5 can be reduced to the minimum, thereby effectively reducing unnecessary eddy current loss on the coil 5 and prolonging the service life.

As shown in fig. 5, a spacer 4 is also disposed on one side of the yoke magnetic blocks on both sides, which faces away from the core column 3, to compensate for the offset between the yoke magnetic blocks on both sides and the yoke magnetic block in the middle, so that the entire surface of the upper yoke 1 forms a coplanar surface. Wherein the spacers 4 are all of a non-magnetic conductive material.

As shown in fig. 3 and 4, the yoke magnetic block is a rectangular parallelepiped structure with a square cross section and is formed by gluing two rectangular parallelepiped magnetic blocks. Wherein, the end surface of the magnetic core column 3 is just opposite to the center of the end surface of the magnetic block of the yoke part.

The side length W of the square cross section of the yoke magnetic block is larger than or equal to the diameter D of the magnetic core column 3, preferably larger than the outer diameter of the coil 5, and the difference between the area of the square cross section of the yoke magnetic block and the area of the end face of the magnetic core column 3 is smaller than 10%.

Mainly aiming at the shielding consideration of the scattered magnetic field of the openings at the two ends of the coil 5; if W is equal to D, the shielding effect is limited, and the inductance is slightly low; if W > D, the shielding effect is gradually increased, and the inductance is also gradually increased. The effect of magnetic shielding of the coil 5 can be increased, so that the inductance is locally increased, and the inductance is locally increased under the condition that the number of turns of the coil 5 is not increased.

EXAMPLE III

A three-phase reactor, as shown in fig. 6 and 7, comprises the three-phase reactor inductance core described in the second embodiment.

The three-phase reactor inductance core is characterized in that each core column 3 of the three-phase reactor inductance core is provided with a coil 5, the upper end and the lower end of the three-phase reactor inductance core are respectively provided with a container 7, the upper yoke part and the lower yoke part are fixed, and the two containers 7 are fixedly connected through a screw 8.

Manufacturing a three-phase reactor:

(1) before the three-phase reactor assembly works, the components such as the coil 5, the magnetic blocks (the upper yoke part 1, the lower yoke part 2 and the magnetic core column 3) of each section, the container 7 and the screw 8 are prepared in advance. The selection of the magnetic block material, the stacking manner, the size and the number of the magnetic blocks are designed according to the working frequency, the maximum load current and the required inductance in the application condition. In the selection of the magnetic block material, a soft magnetic metal alloy powder core is taken as a main material, such as an iron-silicon powder core, an iron-silicon-aluminum powder core, an iron-nickel powder core and the like, and if the working frequency exceeds 100KHz, a manganese-zinc ferrite magnetic core can also be another magnetic block material. The magnetic block stack with each section is designed, and after the size is determined, other components (the container 7 and the screw 8) can be designed according to the size required by assembly.

(2) The small magnetic blocks in the magnetic blocks (the upper yoke part 1, the lower yoke part 2 and the magnetic core column 3) in each section are firstly glued to complete the fixed connection of the magnetic blocks in each section. The spacers 4 are then mounted to form a coplanar surface, as shown in fig. 5.

(3) After the parts are manufactured, the upper and lower yokes can be placed into the container 7 and glued and fixed. Then the magnetic core column 3 is respectively sleeved into the three coils 5 which are wound, and is placed on the lower yoke part 2; the upper yoke part 1 inserted into the receiver is then placed on the upper end surface of the core leg 3 from above. Finally, the screw 8 is fixedly connected to achieve the purpose of tight fit.

The above description is only an example of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the present invention is not limited to the above description.

Claims

1. A composite magnetic core, comprising: the combined magnetic core is mainly formed by axially combining a plurality of cylindrical magnetic blocks (6); the magnetic core comprises a combined magnetic core and is characterized in that end part magnetic blocks are arranged at two ends of the combined magnetic core respectively, the end face of the combined magnetic core is opposite to the center of the end face of each end part magnetic block, and the end part magnetic blocks completely cover the end face of the combined magnetic core.

2. The composite magnetic core of claim 1, wherein: the end faces of the end magnetic blocks are rectangular, wherein any side length of the rectangle is larger than the diameter of the combined magnetic core.

3. The utility model provides a three-phase reactor inductance core, mainly by last yoke portion (1), lower yoke portion (2) and the horizontal "day" style of calligraphy structure that three magnetic core post (3) are constituteed, its characterized in that: the magnetic core column (3) is a cylinder and mainly formed by axially combining a plurality of cylindrical magnetic blocks (6).

4. A three-phase reactor inductor core according to claim 3, characterized in that: the upper yoke part (1) and the lower yoke part (2) are divided into three yoke part magnetic blocks along the length direction, and the three yoke part magnetic blocks correspond to the three magnetic core columns (3) respectively.

5. The three-phase reactor inductor core of claim 4, wherein: and a gasket (4) is arranged on one side, facing the magnetic core column (3), of the middle yoke magnetic block, and a gasket (4) is also arranged on one side, facing away from the magnetic core column (3), of the yoke magnetic blocks on the two sides.

6. The three-phase reactor inductor core of claim 4, wherein: the end face of the yoke magnetic block is rectangular, the end face of the magnetic core column (3) is opposite to the center of the end face of the yoke magnetic block, and any side length of the rectangle is larger than the diameter of the magnetic core column (3).

7. The three-phase reactor inductor core of claim 6, wherein: any side of the rectangle is larger than the outer diameter of a coil (5) wound on the magnetic core column (3).

8. The three-phase reactor inductor core of claim 4, wherein: the yoke magnetic block is formed by combining a plurality of magnetic blocks.

9. A three-phase reactor is characterized in that: comprising a three-phase reactor inductor core according to any of claims 3-8.