CN203551633U

CN203551633U - Iron core used for weak signal current sensor

Info

Publication number: CN203551633U
Application number: CN201320684004.7U
Authority: CN
Inventors: 王永利; 付浩; 姜言金; 宋文国; 李铁锋; 孙志伟
Original assignee: JILIN POWER SUPPLY COMPANY JILIN ELECTRIC POWER Co Ltd; Tieling Power Supply Co Of Liaoning Electric Power Co Ltd; State Grid Corp of China SGCC
Current assignee: JILIN POWER SUPPLY COMPANY JILIN ELECTRIC POWER Co Ltd; Tieling Power Supply Co Of Liaoning Electric Power Co Ltd; State Grid Corp of China SGCC
Priority date: 2013-11-02
Filing date: 2013-11-02
Publication date: 2014-04-16
Anticipated expiration: 2023-11-02

Abstract

The utility model provides an iron core used for a weak signal current sensor. The iron core comprises a first iron core, a rivet and a second iron core. The iron core used for the weak signal current sensor is characterized in that the first iron core and the second iron core are identical in structure and present to be semi-annular. Two ends of each semi-annular iron core are respectively provided with connecting plugs which are fixedly connected as a whole. The first iron core and the second iron core are oppositely arranged. The connecting plugs of the two ends of the first iron core and the connecting plugs of the two ends of the second iron core are mutually plugged. A plugging requirement of the iron core of the weak signal current sensor can be ensured, and area of the cross section of the iron core of the weak signal current sensor can also be reduced so that magnetic induction intensity B is increased, and resolution of the weak signal current sensor is enhanced. Therefore, the iron core used for the weak signal current sensor has advantages of being simple in structure, low in cost and high in sensitivity.

Description

For the iron core of feeble signal current sensor

Technical field

The utility model relates to current sensor, is a kind of iron core for feeble signal current sensor.

Background technology

The current sensor of prior art is to carry out transmission of signal by the conversion of electromagnetism, the problem existing is, when current signal is very faint, the magnetic flux of feeble signal in iron core does not reach the value of iron core initial permeability, affects to a great extent the resolution of current sensor.

Magnetic induction density and iron core magnetic permeability and magnetic field intensity have following relation:

μ×H =B （1）

In formula: μ-iron core magnetic permeability, B-magnetic induction density, H-magnetic field intensity;

Have equally:

μ _i×H =B （2）

In formula: μ _i-iron core initial permeability;

Because magnetic field intensity is to be produced by measured electric current, can only improve magnetic induction density B to increase signal intensity by improving μ.And iron core magnetic permeability μ and magnetic induction density B and there is the relation as Fig. 1 with magnetic field intensity H.Therefore, when current signal is very faint, reduce the sectional area of iron core, can improve magnetic induction density B, this process is equivalent to μ, the relative H horizontal coordinate of B curve to move to left.

Summary of the invention

Technical problem to be solved in the utility model is: overcome the shortcoming of prior art, provide a kind of simple in structure, can effectively improve the very iron core for feeble signal current sensor of low current signal resolution.

The scheme of the utility model technical solution problem is: a kind of iron core for feeble signal current sensor, it comprises the first iron core, rivet and the second iron core, it is characterized in that: described the first iron core is identical with the second core structure, all be semicircle annular, the two ends of semicircle annular core arrange the connection-peg being fixed with one respectively, and the first iron core and the second iron core are opposed, the connection-peg at the first iron core two ends and the connection-peg at the second iron core two ends are pegged graft mutually.

The width of described semicircle annular lamination is L, and one end of semicircle annular lamination is provided with the short plug being fixed with one, and the width of short plug is L ₁, L ₁> L, in the centre of short plug, being h with the end face distance of short plug, position arranges rivet hole; The long plug that the other end setting of semicircle annular lamination is fixed with one, the width of long plug is all L mutually with the width of short plug ₁, in the centre of long plug, being H with the end face distance of long plug, position arranges rivet hole, H > h; Quantity is that several laminations of odd number alternately superpose, by rivet, are connected with short plug and the long plug of one end.

The physical dimension of described lamination is as follows: lamination outside diameter φ 68 ㎜, inside diameter φ 58 ㎜, width L=5 ㎜; Short plug outside diameter φ 71 ㎜, inside diameter φ 55 ㎜, width L ₁=8 ㎜, with the end face distance h=4.5 ㎜ of short plug; Long plug outside diameter φ 71 ㎜, inside diameter φ 55 ㎜, width L ₁=8 ㎜, with the end face distance H=16 ㎜ of long plug; Thick 0.5 ㎜ of lamination, rivet hole diameter phi=1.9 ㎜.

The utility model is for the iron core of feeble signal current sensor, and the width L of its lamination is less than the width L of short plug and long plug ₁, having guaranteed the grafting requirement of the iron core of feeble signal current sensor, the core section that has reduced again feeble signal current sensor is long-pending, has increased magnetic induction density B, has improved the resolution of feeble signal current sensor.Have advantages of simple in structure, cost is low, highly sensitive.

Accompanying drawing explanation

Fig. 1 is iron core magnetic permeability μ and magnetic induction density B and the coordinate diagram with magnetic field intensity H relation;

Fig. 2 is that the utility model is looked schematic diagram for the master of the iron core of feeble signal current sensor;

Fig. 3 is that schematic diagram is looked on a left side of Fig. 2;

Fig. 4 is that the master before the utility model is pegged graft for the iron core of feeble signal current sensor looks schematic diagram;

Fig. 5 is that schematic diagram is looked on a left side of Fig. 4;

Fig. 6 is that the utility model is looked schematic diagram for the lamination master of the iron core of feeble signal current sensor;

Fig. 7 is that schematic diagram is looked on a left side of Fig. 6;

Fig. 8 is the lamination physical dimension front view of the utility model for the iron core of feeble signal current sensor;

Fig. 9 is that schematic diagram is looked on a left side of Fig. 8;

In figure: 1 first iron core, 2 rivets, 3 second iron cores, 4 short plugs, 5 long plugs, 6 laminations, 7 rivet holes.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

With reference to Fig. 2～Fig. 9, the utility model is for the iron core of feeble signal current sensor, it comprises the first iron core 1, rivet 2 and the second iron core 3, several laminations 6 that described the first iron core 1 is odd number by quantity superpose and consist of rivet 2 riveted joints, the first iron core 1 is semicircle annular, the two ends of semicircle annular core arrange the connection-peg being fixed with one respectively, described the second iron core 3 has structure and the annexation identical with the first iron core 1, the first iron core 1 and the second iron core 3 are opposed, the connection-peg at the connection-peg at the first iron core 1 two ends and the second iron core 3 two ends is pegged graft mutually, described lamination 6 is semicircle annular, outside diameter φ 68 ㎜ of semicircle annular lamination 6, inside diameter φ 58 ㎜, width L=5 ㎜, short plug outside diameter φ 71 ㎜, inside diameter φ 55 ㎜, the width of semicircle annular lamination 6 is L=5mm, and thickness is 0.5mm, and one end of semicircle annular lamination 6 arranges the short plug 4 being fixed with one, and the width of short plug 4 is L ₁=8mm, in the centre of short plug 4, being h=4.5mm with the end face distance of short plug 4, position arranges the rivet hole 7 that diameter phi is 1.9mm, the long plug 5 that the other end setting of semicircle annular lamination 6 is fixed with one, the width of long plug 5 is L ₁=8mm, in the centre of long plug 5, being H=16mm with the end face distance of long plug 5, position arranges the rivet hole 7 that diameter phi is 1.9mm, quantity is that several laminations 6 of odd number alternately superpose, by rivet 2 riveted joints, are connected with short plug 4 and the long plug 5 of one end.

In the present embodiment, the permalloy of lamination 6 material selection 1j85, material thickness 0.5mm, adopts the 6 stack riveted joints of 9 laminations, has formed similar caliper brake sensor core structure.In the measurement of practical application, measured 0.05mA electric current, than not having the iron core resolution before improvement to improve 20%.

Claims

1. the iron core for feeble signal current sensor, it comprises the first iron core, rivet and the second iron core, it is characterized in that: described the first iron core is identical with the second core structure, all be semicircle annular, the two ends of semicircle annular core arrange the connection-peg being fixed with one respectively, and the first iron core and the second iron core are opposed, the connection-peg at the first iron core two ends and the connection-peg at the second iron core two ends are pegged graft mutually.

2. the iron core for feeble signal current sensor as claimed in claim 1, is characterized in that: the width of described semicircle annular lamination is L, and one end of semicircle annular lamination is provided with the short plug being fixed with one, and the width of short plug is L ₁, L ₁> L, in the centre of short plug, being h with the end face distance of short plug, position arranges rivet hole; The long plug that the other end setting of semicircle annular lamination is fixed with one, the width of long plug is all L mutually with the width of short plug ₁, in the centre of long plug, being H with the end face distance of long plug, position arranges rivet hole, H > h; Quantity is that several laminations of odd number alternately superpose, by rivet, are connected with short plug and the long plug of one end.

3. the iron core for feeble signal current sensor as claimed in claim 1 or 2, is characterized in that: the physical dimension of described lamination is as follows: lamination outside diameter φ 68 ㎜, inside diameter φ 58 ㎜, width L=5 ㎜; Short plug outside diameter φ 71 ㎜, inside diameter φ 55 ㎜, width L ₁=8 ㎜, with the end face distance h=4.5 ㎜ of short plug; Long plug outside diameter φ 71 ㎜, inside diameter φ 55 ㎜, width L ₁=8 ㎜, with the end face distance H=16 ㎜ of long plug; Thick 0.5 ㎜ of lamination, rivet hole diameter phi=1.9 ㎜.