CN105140002A - Three-phase metal magnetic powder core structure with symmetrical equivalent air gaps - Google Patents
Three-phase metal magnetic powder core structure with symmetrical equivalent air gaps Download PDFInfo
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- CN105140002A CN105140002A CN201510580898.9A CN201510580898A CN105140002A CN 105140002 A CN105140002 A CN 105140002A CN 201510580898 A CN201510580898 A CN 201510580898A CN 105140002 A CN105140002 A CN 105140002A
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Abstract
The invention discloses a three-phase metal magnetic powder core structure with symmetrical equivalent air gaps. The three-phase metal magnetic powder core structure comprises an upper transverse yoke and a lower transverse yoke, wherein the upper transverse yoke and the lower transverse yoke are arranged in a balanced mode and are uniform in shape and size. Three core columns are arranged, perpendicular to the upper transverse yoke and the lower transverse yoke, between the upper transverse yoke and the lower transverse yoke, and coils are wound around the core columns. In actual application, the sizes and structures of the three core columns are uniform, the three core columns are distributed at equal intervals in a pairwise mode and arranged at the three vertex angles of an equilateral triangle respectively, and therefore the three phases of equivalent air gaps of the three-phase metal magnetic powder core structure are equal. The core structure is ingenious and practical; because the three core columns are arranged at equal intervals in the pairwise mode, all the phases of equivalent air gaps of a three-phase electric reactor are equal to one another, and it is guaranteed that the unbalance degree of inductance values of the three-phase electric reactor is smaller than 4%. By the adoption of the technical scheme, the three-phase magnetic powder core structure can be obtained and is utilized for manufacturing the miniature light three-phase electric reactor low in cost and small in size.
Description
Technical field
The present invention relates to metal magnetic powder core reactor field, in particular a kind of three-phase metal magnetic cored structure of symmetrical effective air gap.
Background technology
Corresponding magnetic material powder mixes with binding agent by metal magnetic powder core usually, by the operation such as mold pressing, solidification, makes corresponding shape, to be applicable to various inductance, is particularly useful for the inductor etc. of EMI/RFI filter inductance, high-frequency low-loss requirement.Owing to mixing a large amount of namagnetic substance in the material of metal magnetic powder core, make air gap be distributed in magnetic core, magnetic field energy in whole magnetic core, avoids the strong electromagnetic radiation because concentrated air gap produces and high-frequency loss with regard to mapped storage.
Because its air gap of structures shape of metal magnetic powder core is evenly distributed in magnetic core substantially, when being applied in single-phase induction structure, there is fabulous performance, but when being applied in three-phase reactor structure, the degree of balance of what asymmetrically distributed air gap was serious the have impact on inductance value of three-phase reactor.This is because conventional three-phase reactor core structure is three-phase three core column structure, if use metal magnetic powder core as the iron core of three-phase reactor, air gap is evenly distributed with equally in upper bottom rail yoke, from the structure of three-phase three stem stem, the length of magnetic path of A, C two-phase (i.e. left and right two-phase) is greater than B phase (center phase), thus makes the effective air gap of A, C phase in metal magnetic powder core much larger than B phase.Size of gaps is very huge on inductance value impact, and the different meeting of effective air gap of three-phase causes the inductance value degree of unbalance of three-phase reactor to go beyond the scope, and even can exceed more than 30%.Therefore, metal magnetic powder core is not adopted to make three-phase reactor structure in current industry.
In practical application, under the requirement that some are special, need the metal magnetic powder core inductance using three-phase, way general is in the industry at present: the metal magnetic powder core inductance of three-phase is resolved into three single-phase inductance, each single-phase inductance uses annular or hollow metal magnetic powder core to make, then three single-phase inductance is connected into three pole reactor use.Three pole reactor is resolved into three single-phase inductance and makes by this mode of production, considerably increases the cost of product, volume, loss, production hour etc., is unfavorable for the energy-saving and cost-reducing theory that the miniaturization of product, low cost, low-loss and country advocate.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of three-phase metal magnetic cored structure of symmetrical effective air gap, be intended to make the effective air gap of each phase of three-phase reactor structure equal, metal magnetic powder core can be applied in three-phase reactor structure.
Three stem stems of traditional three pole reactor structure are generally that planar alignment is arranged, when metal magnetic cored structure is applied in three pole reactor structure, there is larger difference in the effective air gap of AC two-phase and B phase that three stem stems that planar alignment is arranged result in three pole reactor structure, this species diversity directly affects the degree of balance of three pole reactor, time serious, the degree of unbalance of three-phase electricity sensibility reciprocal is made to exceed more than 30%.
In order to make the three-phase effective air gap of three pole reactor structure equal, the present invention proposes following technical scheme: a kind of three-phase metal magnetic cored structure of symmetrical effective air gap, comprise balance arrange, and the consistent upper horizontal yoke of geomery and bottom rail yoke, between upper horizontal yoke and bottom rail yoke, upper horizontal yoke and bottom rail yoke are provided with three stem stems, stem stem is wound with coil, in practical application, the dimensional structure of three stem stems is consistent, three stem stems are equally spaced between two, be separately positioned on three drift angle places of equilateral triangle, make the effective air gap of the three-phase of three-phase metal magnetic cored structure equal.Upper horizontal yoke and bottom rail yoke are fixedly connected with upper surface and the lower surface of three stem stems respectively, form flux circuit, this structure that the present invention proposes, the length of magnetic path of the ABC three-phase of three pole reactor structure is completely equal, therefore its three-phase effective air gap is also substantially completely equal, ensure that the inductance value of three-phase is completely equal, improve the stability of metal magnetic powder core three pole reactor arrangement works, make the degree of unbalance of the inductance value of metal magnetic powder core three-phase reactor be less than 4%.
Concrete, stem stem is the one in cylinder stem stem, cuboid stem stem or polygon stem stem.In practical application, stem stem is preferably cylinder stem stem, and this is due to cylinder core rod structure, the distribution of its internal air gap is more even, make the three-phase reactor structure obtained, its three-phase effective air gap degree of approach is higher, and the degree of balance of the inductance value of three-phase reactor is higher.
But during due to employing cylinder stem stem, the cylinder stem stem of different size needs corresponding different moulds, therefore require that the quantity of mould is too many, greatly improve production cost and reduce convenience and the flexibility of production.In embody rule, the equilateral triangle parts that stem stem is preferably arranged by multiple monomer bond the hexagon stem stem formed by epoxy glue, and hexagon is close to circle, and the distribution of its internal air gap is comparatively even, is beneficial to the degree of balance improving three-phase; Save copper cash and space simultaneously, reduce production cost and decrease small product size.This hexagon core column structure that the present invention proposes, when specifically producing, only need the equilateral triangle parts producing multiple same size, carry out again assembling the hexagon core column structure obtaining different size, also can obtain other regular polygon core column structures by these equilateral triangle assembling parts simultaneously, flexibility is strong, is applicable to the product of different size size.
Further, in order to be beneficial to the bonding of each metal magnetic powder core faying face, the side of the equilateral triangle parts that each monomer is arranged being provided with groove, after multiple equilateral triangle component combination forms stem stem, forming circular groove in stem stem inside.Before assembling, epoxy glue is applied in the groove on equilateral triangle parts side with on side, when the side of adjacent two equilateral triangle parts and lateral junction combined pressure tight time, epoxy glue can be extruded appearance or get in the circular groove at middle part, the equilateral triangle parts arranged by each monomer are firmly bonded together, and improve the reliability of its combination.
Introduce the structure of upper horizontal yoke and bottom rail yoke below.
Upper horizontal yoke and bottom rail yoke are the one in circle, equilateral triangle or Y shape.Further, upper horizontal yoke and bottom rail yoke center are provided with cavity.Being provided with of cavity is beneficial to saving material, is conducive to the smooth degree improving flux circuit simultaneously.In practical application, cavity is circular or equilateral triangle.Preferably, cavity is equilateral triangle, this setup, make the three-phase flux circuit of three-phase reactor definitely, ensure that the length of magnetic path is completely equal, thus ensure that the effective air gap of three-phase is consistent, reduce the degree of unbalance of the inductance value of three-phase reactor further.
In embody rule, the shape of upper horizontal yoke and bottom rail yoke is preferably equilateral triangle, and now the equivalent magnetic circuit length of each phase of core structure is the shortest, and shorter then its inductance value of the length of magnetic path is higher under the same conditions.Meanwhile, upper horizontal yoke and the bottom rail yoke structure of equilateral triangle can conveniently be combined with stem stem, improve integrally-built steadiness, ensure smooth degree and the stability of flux circuit simultaneously.Meanwhile, because the magnetic flux of each phase flows to other two-phase through leg-of-mutton both sides all simultaneously, the sectional area on the institute each limit of equilateral triangle of horizontal yoke and bottom rail yoke above only needs the half of stem stem sectional area, can reach same magnetic flux density, reduce cost.
Further, upper horizontal yoke and the bottom rail yoke structure of equilateral triangle are made up of the cuboid of multiple monomer, form equilateral triangle cavity in the middle part of the horizontal yoke of equilateral triangle.The cuboid of multiple monomer can be combined to form the horizontal yoke structure of equilateral triangle of different size according to actual needs, improves flexibility and the convenience of the production of horizontal yoke structure, decreases the quantity of mould, reduce production cost.Meanwhile, the upper horizontal yoke of this structure or bottom rail yoke have three connecting end surfaces, and the upper and lower end face of corresponding three stem stems of difference or crossing side, its three-phase effective air gap degree of approach is higher, and the degree of balance of the inductance value of three-phase reactor is better.
Beneficial effect of the present invention: the ingenious practicality of structure of the present invention, three stem stems are equidistantly arranged between two, make the effective air gap of each phase of three-phase reactor equal, ensure that the inductance value degree of unbalance of three-phase reactor is less than 4%, and propose a series of prioritization scheme, magnetic circuit is more optimized, processing mold generalization, cost are lower, bonding is more reliable.By technical scheme of the present invention, three-phase powder core structure can be obtained, realize utilizing powder core structure fabrication go out low cost, the miniature lightweight three-phase reactor of small size.
Accompanying drawing explanation
Fig. 1 is the structural representation that horizontal yoke adopts the three-phase metal magnetic cored structure of the symmetrical effective air gap of disc structure.
Fig. 2 is the vertical view of the three-phase metal magnetic cored structure of regular hexagon core column structure.
Fig. 3 is the vertical view that horizontal yoke adopts circular ring structure three-phase metal magnetic cored structure.
Fig. 4 is the vertical view that horizontal yoke adopts entity equilateral triangle structure three-phase metal magnetic cored structure.
Fig. 5 is the vertical view that horizontal yoke is provided with the equilateral triangle structure three-phase metal magnetic cored structure of cavity.
Fig. 6 is the vertical view of the upgrading combination three-phase metal magnetic cored structure of Fig. 5.
Fig. 7 is the vertical view of the upgrading combination three-phase metal magnetic cored structure of Fig. 6.
Fig. 8 is the vertical view of equilateral triangle parts.
Fig. 9 is the vertical view of the stem stem utilizing equilateral delta-shaped members composition in Fig. 8.
Embodiment
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
Embodiment 1
Present embodiment discloses a kind of three-phase metal magnetic cored structure of symmetrical effective air gap, as shown in Figure 1, comprise balance arrange and the upper horizontal yoke 110 that geomery is consistent and bottom rail yoke 120, between upper horizontal yoke 110 and bottom rail yoke 120, upper horizontal yoke 110 and bottom rail yoke 120 are provided with three stem stem 200(and form A phase, B phase and C phase respectively), stem stem 200 is wound with coil 300.In practical application, the dimensional structure of three stem stems 200 is consistent, and three stem stems 200 are equally spaced between two, are separately positioned on three drift angle places of equilateral triangle, and this setup makes the effective air gap of the three-phase of three-phase metal magnetic cored structure equal.
In practical application, stem stem 200 or upper horizontal yoke 110 and bottom rail yoke 120 can use monomer powder core to make, or use multiple powder core to be formed by stacking (utilizing epoxy glue to fix).This powder core adopts corresponding magnetic material powder to mix with binding agent, shaping by molded curing, makes default shape (such as annular, cylindrical, bar shaped etc.).According to the difference of material, powder core is mainly divided into Fe-Si-Al magnetic core, ferrosilicon powder core, iron tantnickel powder core, high magnetic flux iron nickel powder core, iron nickel molybdenum powder core etc.
Upper horizontal yoke 110 and bottom rail yoke 120 are fixedly connected with upper surface and the lower surface of three stem stems 200 respectively, form flux circuit, this structure of the present embodiment is applicable to different powder cores, the length of magnetic path of the ABC three-phase of three pole reactor structure can be made completely equal, therefore its three-phase effective air gap is also substantially completely equal, ensure that the inductance value of three-phase is completely equal, improve the stability of three pole reactor arrangement works.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 4%.
Embodiment 2
See Fig. 2, the present embodiment is basic identical with embodiment 1, unlike, the stem stem 200 of the present embodiment is regular hexagon stem stem, and the equilateral triangle parts 210 that each regular hexagon stem stem is arranged by 6 monomers form, and equilateral triangle parts are arranged to a standard component by this set structure, the stem stem producing different size does not need to use different moulds, only need to utilize equilateral triangle parts to carry out Optional assembling, improve production efficiency, reduce production cost simultaneously.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 4%.
Embodiment 3
See Fig. 3, the present embodiment is basic identical with embodiment 2, unlike, be provided with circular cavity 130(in the middle part of the upper horizontal yoke 110 of the present embodiment and bottom rail yoke 120 and namely go up horizontal yoke 110 and bottom rail yoke 120 adopts circular ring structure), being provided with of cavity 130 is beneficial to coil heat and upwards distributes and save material, is conducive to the smooth degree improving flux circuit simultaneously.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 3%.
Embodiment 4
See Fig. 4, the present embodiment is basic identical with embodiment 2, unlike, the upper horizontal yoke 110 of the present embodiment and bottom rail yoke 120 are arranged to solid equilateral triangle, this setup, compared to the circular configuration in embodiment 2, more save material, simultaneously unnecessary blank is less, and air gap is more concentrated, make the three-phase reactor structure obtained, its three-phase effective air gap degree of approach is higher.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 3%.
Embodiment 5
See Fig. 5, the present embodiment is basic identical with embodiment 4, unlike, the upper horizontal yoke 110 of the present embodiment and the center of bottom rail yoke 120 are provided with the cavity 130 of equilateral triangle, and upper horizontal yoke 110 and bottom rail yoke 120 form (cuboid 140 of this monomer is rectangular-shaped metal magnetic cored structure) by the cuboid 140 of three monomers in triangular arranged.This setup, compared to the structure of embodiment 4, saves material more, three-phase flux circuit definitely simultaneously, ensure that three-phase magnetic circuit length is completely equal, thus ensure that the effective air gap of three-phase is consistent, reduce the degree of unbalance of three-phase reactor inductance value further.On the other hand, three stem stems 200 distance is between any two the shortest, magnetic induction is best, the magnetic flux of each phase flows to other two-phase through leg-of-mutton adjacent both sides all simultaneously, the sectional area on each limit of equilateral triangle of above horizontal yoke 110 and bottom rail yoke 120 only need the half of stem stem 200 sectional area, same magnetic flux density can be reached, reduce cost.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 2%.
Embodiment 6
See Fig. 6, the present embodiment is basic identical with embodiment 5, unlike, the upper horizontal yoke 110 of the present embodiment and each side column of bottom rail yoke 120 adopt the cuboid 140 of 4 monomers to form, corresponding, the equilateral triangle parts 210 that stem stem 200 adopts 24 monomers to arrange form.This set structure, makes the cuboid 140 of monomer form a standard component, for upper horizontal yoke 110 and the bottom rail yoke 120 of different size size, only the cuboid 140 that quantity is different need be adopted to carry out assembling, enhances productivity and reduce production cost; In addition, this set structure increases the power capacity of reactor.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 3%.
Embodiment 7
See Fig. 7, the present embodiment is basic identical with embodiment 6, unlike, the upper horizontal yoke 110 of the present embodiment and each side column of bottom rail yoke 120 adopt the cuboid 140 of 6 monomers to form, and the equilateral triangle parts 210 that stem stem 200 adopts 30 monomers to arrange form, form class parallelogram sturcutre, stem stem 200 with on the intersection of horizontal yoke 110 or bottom rail yoke 120 only need increase by 3 equilateral triangle bodies and supplement.Utilize the three-phase reactor that the three-phase metal magnetic powder core structure fabrication of the present embodiment obtains, the degree of unbalance of its three-phase electricity sensibility reciprocal is less than 3%.
See Fig. 8, three sides of the equilateral triangle parts 210 of the monomer setting that above-described embodiment 2 ~ 7 is used are provided with groove 501, after multiple equilateral triangle parts 210 are assembled and formed stem stem, the inside of this stem stem forms circular groove 502(see Fig. 9).Before assembling, epoxy glue is applied in the groove on equilateral triangle parts side with on side, when the side of adjacent two equilateral triangle parts and lateral junction combined pressure tight time, epoxy glue can be extruded appearance or get in the circular groove at middle part, the equilateral triangle parts arranged by each monomer are firmly bonded together, and improve the reliability of its combination.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (9)
1. the three-phase metal magnetic cored structure of a symmetrical effective air gap, comprise balance arrange and the upper horizontal yoke that geomery is consistent and bottom rail yoke, between upper horizontal yoke and bottom rail yoke, upper horizontal yoke and bottom rail yoke are provided with three stem stems, described stem stem are wound with coil, it is characterized in that, the dimensional structure of described three stem stems is consistent, three stem stems are equally spaced between two, are separately positioned on three drift angle places of equilateral triangle, make the three-phase effective air gap of three-phase metal magnetic cored structure equal.
2. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 1, is characterized in that, described stem stem is the one in cylinder stem stem, cuboid stem stem or polygon stem stem.
3. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 2, is characterized in that, described stem stem is hexagon stem stem.
4. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 3, is characterized in that, the equilateral triangle parts that described stem stem is arranged by multiple monomer form.
5. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 4, it is characterized in that, three sides of described equilateral triangle parts are provided with groove, after multiple equilateral triangle component combination forms stem stem, form circular groove in stem stem inside.
6. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 1, is characterized in that, described horizontal yoke and bottom rail yoke are the one in circle, equilateral triangle or Y shape.
7. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 6, is characterized in that, the center of described horizontal yoke or bottom rail yoke is provided with cavity.
8. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 7, is characterized in that, described cavity is circular cavity or equilateral triangle cavity.
9. the three-phase metal magnetic cored structure of symmetrical effective air gap according to claim 7, it is characterized in that, described horizontal yoke or bottom rail yoke are the horizontal yoke of equilateral triangle, three sides of the horizontal yoke of described equilateral triangle are made up of the cuboid of multiple monomer respectively, form equilateral triangle cavity in the middle part of the horizontal yoke of described equilateral triangle.
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Application publication date: 20151209 |