CN106205839A - High frequency lead and preparation method thereof - Google Patents

Abstract

The present invention relates to lead technology field, disclose a kind of high frequency lead and preparation method thereof, to effectively reduce the loss that wire is caused by high frequency magnetic field or electric current and higher hamonic wave.High frequency lead disclosed by the invention, including at least two strands of strands, all enamel-covered wires in each strand are isometric and in arranged in parallel, and between each strand, staggered transposition is arranged in braided；The quantity of the enamel-covered wire in the most each strand is consistent, and the specification of each enamel-covered wire is consistent.Invention additionally discloses the manufacture method of a kind of high frequency lead, including: determine the sectional area size of enamel-covered wire according to the performance indications of Kelvin effect and eddy-current loss, in order to the quantity of enamel-covered wire in the quantity of strand of current-sharing and each strand；Enamel-covered wire in the most each strand is isometric and quantity consistent, and the specification of each enamel-covered wire is consistent；And staggered for each strand transposition is arranged into high frequency lead in braided.

Description

High frequency lead and preparation method thereof

Technical field

The present invention relates to lead technology field, particularly relate to a kind of high frequency lead and preparation method thereof.

Background technology

Wire is the most all operated under alternating magnetic field or turns on alternating current, the most also can carry the higher hamonic wave of many. Being affected by eddy current effect and Kelvin effect etc. due to wire in these cases, wire will produce alternating electromagnetic loss, The alternative frequency of magnetic field and electric current is the highest, and its loss is the biggest.In order to solve this problem, reducing wire cross-section area is to reduce The maximally effective way of high-frequency loss.We generally use the wire of many mutually insulateds and connect use, at same conductive section Under Ji, reduce the sectional area of solid conductor, high frequency magnetic field or electric current can be effectively reduced and wire is caused by higher hamonic wave Loss.The sectional area of solid conductor is the least, and its loss is the lowest.Make owing to wire is usually made various coil With, the winding process of coil uses multiple conducting wires and is wound in technique and is difficult to accomplish that the length of each wire is consistent, this is just After causing each wire and being coiled into coil, the magnetic field intensity in stray field is different, thus induces different induced voltages, In parallel conducting wire, form circulation, the most just create unnecessary loss, make wire be difficult to reduce the purpose of loss.Simultaneously Owing to wire does not has well-regulated several paralleled conductor, wire cannot molding, the also coiling of inconvenient coil.

Summary of the invention

Present invention aim at open a kind of high frequency lead and preparation method thereof, to effectively reduce high frequency magnetic field or electric current And the loss that wire is caused by higher hamonic wave.

For achieving the above object, the invention discloses a kind of high frequency lead, including at least two strands of strands, in each strand All enamel-covered wires isometric and in arranged in parallel, and between each strand, staggered transposition is arranged in braided；The most each strand The quantity of interior enamel-covered wire is consistent, and the specification of each enamel-covered wire is consistent.

For achieving the above object, invention additionally discloses the manufacture method of a kind of high frequency lead, including:

Performance indications according to Kelvin effect and eddy-current loss determine the sectional area size of enamel-covered wire, in order to the wire of current-sharing The quantity of enamel-covered wire in the quantity of bundle and each strand；Enamel-covered wire in the most each strand is isometric and quantity consistent, respectively paints The specification of envelope curve is consistent；And

Staggered for each strand transposition is arranged into high frequency lead in braided.

Preferably, above-mentioned high frequency lead is flat, and the quantity of strand is 2, and the enamel-covered wire in each strand is arranged into String.

The method have the advantages that

Can the size of sectional area of wire as required, use enamel-covered wire different and connect radical and different line footpaths, do Go out the high frequency lead of different cross-sectional, to meet the demand under various operating mode；And in this high frequency lead can be essentially ensures that Every and to connect enamel-covered wire length in coil-winding process consistent, it is achieved effectively replace, it is ensured that every enamel-covered wire realizes current-sharing Purpose, and then Kelvin effect and eddy-current loss are preferably minimized.

Below with reference to accompanying drawings, the present invention is further detailed explanation.

Accompanying drawing explanation

The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the knitting twill schematic diagram of the high frequency lead of the preferred embodiment of the present invention；

Fig. 2 is the manufacture method flow chart of high frequency lead disclosed in the preferred embodiment of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can be defined by the claims Implement with the multitude of different ways covered.

Embodiment 1

The first open a kind of high frequency lead of the embodiment of the present invention, including at least two strands of strands, owning in each strand Enamel-covered wire is isometric and in arranged in parallel, and between each strand, staggered transposition is arranged in braided；Paint in the most each strand The quantity of envelope curve is consistent, and the specification of each enamel-covered wire is consistent.

Preferably, as it is shown in figure 1, the quantity of the strand of this high frequency lead 10 is 2, the enamel-covered wire in each strand is side by side Become string, between two strands, carry out braiding processing by the staggered twill technique of copper litz wire.Wherein, this high frequency lead is permissible It is woven into flat with the weaving of copper litz wire, facilitates coiling and realize this high frequency lead by the transposition during braiding When being turned to coil, it is ensured that and around length basically identical.

What deserves to be explained is, existing copper litz wire, use high-quality circular copper wire or tin plating soft circular copper wire with many stock-traders' know-hows monolayer Or multi-layer braided one-tenth, its pliability solved, dispel the heat, bend and conductivity and the problem such as easy for installation.The present invention then uses it The problem such as Kelvin effect and eddy-current loss of solution.Concrete principle is as follows:

One, the solution to Kelvin effect

When alternating current flows through conductor, the sense of current is alternate, electric current produced alternating magnetic field in the conductor Repulsion active force to electric charge, forces the surface of current charge conductor 801 to be concentrated so that the actually active current carrying area of conductor subtracts Little.When alternating current flows through conductor, there is the phenomenon that electric current conductor 801 surface is concentrated, the referred to as Kelvin effect of alternating current； Electric current leaves the degree that center, conductor current-carrying face is concentrated to surface, can weigh by the Kelvin effect degree of depth.The Kelvin effect degree of depth Can be expressed as:

$d=k\×\frac{66.}{\sqrt{f}}\left(mm\right)$

Note: in formula, f is the frequency (Hz) of electric current, and k is constant (copper conductor is 1)

As shown from the above formula, frequency is the highest, and the Kelvin effect degree of depth is the least, electric current leave center, conductor current-carrying face to table The degree that face is concentrated is the highest, and the present invention utilizes multiply fine rule in parallel, and fine rule is the enamel-covered wire of tape insulation, will a wire or several Root heavy in section is amassed wire and is divided into the parallel connection of a lot of stock small sectional area conductor, effectively prevent the impact that Kelvin effect is brought, so Multiply fine rule parallel connection is utilized to replace solid wire be able to the impact of the Kelvin effect of alternating current be minimized.

Two, the solution to eddy-current loss:

When wire is in the middle of longitudinal leakage magnetic flux, can produce eddy current at the section of wire, longitudinal leakage magnetic flux is produced Eddy current be uniformly distributed at conductor cross-section at the distributional assumption eddy current of conductor cross-section, according to infitesimal analysis method, can obtain at this Simplification eddy-current loss computing formula in the range of conductor cross-section:

$P_x=\frac{{\mathrm{\π}}^2}{6{\mathrm{\ρ}}_{r}r}\×{10}^{-3}G{\left({\mathrm{afB}}_x\right)}^2$

Wherein: ρ_rFor resistance coefficient Ω mm2/m；R is wire density kg/dm, and G is wire weight, kg；B_xClose for magnetic, T； α is the thickness of the conductor infinitesimal taken, mm.

The present invention utilizes multiply fine rule in parallel, and fine rule is the enamel-covered wire of tape insulation, reduces the thickness of wire, i.e. eddy current and damages α in consumption calculating, is preferably minimized eddy-current loss.

To sum up, in the present embodiment can be essentially ensures that high frequency lead every and connect enamel-covered wire in coil-winding process Length is consistent, it is achieved effectively replace, it is ensured that every enamel-covered wire realizes the purpose of current-sharing, and then Kelvin effect and eddy-current loss is dropped To minimum.And the present embodiment can the size of sectional area of wire as required, use enamel-covered wire different and connect radical and not Same line footpath, makes the high frequency lead of different cross-sectional, to meet the demand under various operating mode；Specifically manufacture method such as Fig. 2 institute Show, including:

Step S1, performance indications according to Kelvin effect and eddy-current loss determine the sectional area size of enamel-covered wire, in order to all The quantity of enamel-covered wire in the quantity of the strand of stream and each strand；Enamel-covered wire in the most each strand is isometric and quantity one Causing, the specification of each enamel-covered wire is consistent.

Step S2, the transposition that interlocked by each strand are arranged into high frequency lead in braided.It is also preferred that the left the leading of this high frequency lead The quantity of wire harness is 2, and the enamel-covered wire in each strand is arranged into string, so that made high frequency lead is flat, and side Just the coiling of coil.

Further, following Experimental comparison is relied on to verify the performance of high frequency lead of the present invention further.Testing scheme is for adopting Turn to inductance with different line rule and in conjunction with cross section wire parallel connection, pass to electric current after inductance series connection, contrast the temperature rise of each inductance, Inductance parameters such as table 1 below, corresponding test temperature rise result such as table 2:

Table 1:

Table 2:(ambient temperature: 17 DEG C)

In Table 1, the total sectional area of wire be enamel-covered wire sectional area with and around the product of enamel-covered wire radical.Can from table 2 Know, under conditions of wire total sectional area is basically identical, the most collinear rule and in conjunction with cross section conductor coiling inductance 8A electric current, Temperature rise under the conditions of the equal number of plies and the number of turn etc. has significantly different, wherein minimum (a diameter of for single smallest cross-sectional of temperature rise Φ 0.17) the inductance of conductor coiling, such as order from left to right in table 2, along with the increase that enamel-covered wire section of diameter is long-pending, its temperature Rising and be stepped up, and the temperature rise of solid conductor is the highest, and the heavy in section of existing Φ 1.5 is amassed wire and compared the present invention and painted by Φ 0.17 The high frequency lead that envelope curve parallel connection is formed, the test temperature difference of 100 minutes is up to 44K, conforms exactly to the content that this patent is invented. It should be noted that in experiment, the harmonic content of the electric current that inductance passes to is less than 3%, if changing to the test wrapper that harmonic content is bigger Border, more can embody the technical advantage of patent of the present invention.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (4)

1. a high frequency lead, it is characterised in that include at least two strands of strands, all enamel-covered wires in each strand are isometric also In arranged in parallel, and between each strand, staggered transposition is arranged in braided；The quantity one of the enamel-covered wire in the most each strand Causing, the specification of each enamel-covered wire is consistent.

High frequency lead the most according to claim 1, it is characterised in that described high frequency lead is flat, described strand Quantity be 2, the enamel-covered wire in each strand is arranged into string.

3. the manufacture method of a high frequency lead, it is characterised in that including:

Performance indications according to Kelvin effect and eddy-current loss determine the sectional area size of enamel-covered wire, in order to the strand of current-sharing The quantity of enamel-covered wire in quantity and each strand；Enamel-covered wire in the most each strand is isometric and quantity consistent, each enamel-covered wire Specification consistent；And

Staggered for each strand transposition is arranged into high frequency lead in braided.

The manufacture method of high frequency lead the most according to claim 3, it is characterised in that described high frequency lead is flat, The quantity of strand is 2, and the enamel-covered wire in each strand is arranged into string.