CN1274934A

CN1274934A - Silicon steel wire wound transformer core

Info

Publication number: CN1274934A
Application number: CN 99115777
Authority: CN
Inventors: 陈骏
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-20
Filing date: 1999-05-20
Publication date: 2000-11-29

Abstract

By using soft magnetic silicon steel wire as material for transformer core, the core of the present invention has eddy-current loss and generated heat obviously lower than that of traditional core of laminated silicon steel sheets. The present invention makes it possible to save large amount of steel, copper and aluminum and to manufacture transformer core without leftover.

Description

Silicon steel wire wound transformer core

Content of the present invention belongs to electrical engineering and electric apparatus manufacturing technology field, relates to a kind of manufacture craft and product of iron core of transformer.

Iron core is the key member that constitutes transformer magnetic circuit.In the prior art, iron core is repeatedly adorned with electrical steel sheet usually and is formed, and a kind of annular core that rolls with silicon strip is also arranged; The material of making iron core except that most employing electrician with the silicon steel sheet, magnetically soft alloy band (iron-nickel, iron-cobalt-vanadium, the iron-aluminum series alloy) material that uses under specific (special) requirements is also arranged.Make iron core with silicon steel sheet, need to be formed with the magnetic circuit of seam air gap through punching, technical processs such as dress, clamping repeatedly, its goods exist that permeability is lower, iron core eddy current loss is relatively large, iron core easily generates heat and defective such as cost is higher; Roll annular core with silicon strip, need to adopt the steel band rolling technology, because this technology only can be processed the whole circle ring iron core that cross section is a rectangle, making cross section as need is circle, whole EI shape or three-phase three-column, three-phase and five-pole iron core, then processing technology will be very complicated and difficult, and have a large amount of leftover bits losses.

The objective of the invention is to overcome the defective that prior art exists, provide a kind of novel structure, high efficiency and production cost low transformer core.

The technical solution of making is so for achieving the above object: adopt the soft magnetism silicon steel silk with regular geometric cross section to replace the material of the silicon steel sheet of traditional product use as the making iron core, transformer core promptly provided by the present invention is a kind of closo iron core that is formed by the soft magnetism silicon steel wire wound with regular geometric cross section.

Below with reference to accompanying drawing content of the present invention is described further.

Fig. 1 is the stem stem cross section structure schematic diagram of iron core of the present invention.

Fig. 2～4 are respectively the schematic cross-section of three types of silicon steel silks that the coiling iron core uses.

Fig. 5 and Fig. 6 are respectively the structural representation of two specific embodiments of the present invention.

Referring to accompanying drawing, the silicon steel silk that is used for the coiling iron core is that the electrician makes by cold drawn or hot-drawn technology with silicon steel Cross section be the steel wire of regular geometric shape, as required in mould that the continuous close coiled of steel wire is any during making The iron core of shape, but the surface coating insulating layer of steel wire or naked layer. The said regular geometric shape of the present invention horizontal stroke The cross section comprises as shown in Figure 2 circular cross section, regular hexagonal cross section as shown in Figure 3 or such as Fig. 4 institute The square cross section of showing, the string diameter A of silicon steel silk≤1mm.

Adopt silicon steel wire wound transformer core, since the geometric features of silicon steel silk, the eddy-current loss of iron core Be significantly less than the change eddy-current loss of foundary weight core of sheet silicon steel sheet, also reduced magnetic hysteresis loss, increased magnetic flux Amount, therefore, the caloric value of iron core is also littler. Make iron core with silicon steel sheet needs through punching, repeatedly dress, clamping in the past Etc. technical process, be formed with the magnetic circuit of seam air gap, and the silicon steel wire wound iron core adopts continuous coiling in mould Technology, iron core does not have seam and does not have air gap. According to the magnetic circuit Ampere's law: magnetic field intensity vector (H) is along certain closed curve (L) line integral equals to be enclosed in the algebraical sum of each electric current (I) in this curve, i.e. ∮ Hcos α dL=∑ I. According to the magnetic circuit fundamental relation, magnetic field intensity (H) equals magnetic induction intensity (B) with the amassing of permeability (μ) in addition. Becoming Magnetic induction intensity in the depressor magnetic circuit (B) is the designing and calculating definite value, because the permeability (μ of air₀) be several one thousandths of ferromagnetic material permeability, therefore the having in the air-gap magnetic circuit of middle low power transformer, ∮ H falls in the magnetic pressure of air gap part₀cosαdL ₀Accounted for the major part that whole magnetic pressure are fallen. Under the Same Efficieney condition, no air-gap magnetic circuit The iron core transverse sectional area can be less than the cross-sectional area that the air-gap magnetic circuit iron core is arranged; Or in the situation of same cross-sectional area iron core Lower minimizing does not have the circuit part umber of turn in the air-gap magnetic circuit transformer. From the magnetic circuit Ampere's law also as can be known, adopt The exciting current of its circuit winding of the transformer of no air-gap magnetic circuit also will correspondingly reduce, and therefore, adopts the silicon steel silk Coiling does not have the transformer of air-gap magnetic circuit structure, can save a large amount of steel or copper, aluminium. In addition, silicon steel filament winding Iron core processed adopts continuous coiling technology, and its technique for coiling is that the silicon steel silk is many in the winding mold that design processes in advance Layer is arranged continuous coiling, be shaped simple and realize easily mechanization and automated production, the production efficiency height, can around Make the iron core of multiple geometric cross-section iron core and variable cross-section, can in production, realize no corner simultaneously The scrap piece loss processing technology.

Embodiment one

The iron formula does not have air gap three phase mains transformer core in medium-sized, its structure as shown in Figure 5, it is that variable cross-section shape square frame iron core semicircle, that iron yoke cross section is rectangle combines by three iron core column cross sections.Described square frame iron core forms with pouring into a mould with epoxy resins insulation after the circular silicon steel silk multilayer arrangement coiling in variable cross-section shape square frame winding mold again, three phase mains transformer with this iron core manufacturing can fundamentally solve the isometric and magnetic circuit AXIALLY SYMMETRIC PROBLEMS of three-phase magnetic circuit system magnetic circuit, and the exciting current of each phase also equates in the circuit winding part.The continuous technique for coiling of silicon steel silk has been eliminated the seam air gap between traditional structure iron core column and iron yoke, under the situation that no air gap leakage reluctance, exciting current decline, three-phase magnetic circuit symmetry and eddy current loss descend, its electromagnetic performance that manufactures a product all obviously is better than the silicon steel sheet foundary weight core transformer that changes, and steel, the copper material of required usefulness also significantly reduce in making equal power transformer.The present embodiment structure can be widely used in the production of middle low power dry-type transformer.

Embodiment two

Small-sized shell type does not have air gap single-phase transformer iron core, its structure as shown in Figure 6, it is that semicircular square frame iron core is formed by two cross sections.Described square frame iron core is used the epoxy resins insulation moulding by casting with regular hexagon silicon steel silk after by the honeycomb arrangement coiling again in semi-circular cross-section square frame winding mold, the cylindrical wires ring framework is installed on the circular cross section iron core column, is rotated the skeleton winding conductor and just more easily on skeleton, form transformer coil.Making transformer with this iron core does not have the air gap leakage reluctance, and after choosing suitable core window size, the coefficient of mutual inductance design that can make transformer is in optimized scope.Have also that exciting current is little, volume is little and advantage such as caloric value is little with the transformer of this iron core manufacturing.In the production application process, this structure iron core can be used for making the insertion transformer of small power transformer and circuit impedance conversion.

Claims

1, a kind of transformer core is characterized in that said iron core is the closo iron core that is formed by the soft magnetism silicon steel wire wound with regular geometric cross section.

2, transformer core as claimed in claim 1, the soft magnetism silicon steel silk that it is characterized in that being used for the coiling iron core is the silicon steel silk with circle, regular hexagon or square cross section, the silk footpath A≤1mm of silicon steel silk.