CN202522605U

CN202522605U - Magnetic core used for current sensor and corresponding current sensor

Info

Publication number: CN202522605U
Application number: CN2012201906912U
Authority: CN
Inventors: 何玉喜; 郭明强; 王广明; 张雨秋
Original assignee: Honeywell International Inc
Current assignee: Honeywell International Inc
Priority date: 2012-04-17
Filing date: 2012-04-17
Publication date: 2012-11-07
Anticipated expiration: 2022-04-17

Abstract

The utility model provides a magnetic core used for a current sensor. The edge of the magnetic core is continuous; a through hole is formed in the main body part enclosed by an external edge of the magnetic core; and the axial direction of the through hole is parallel to the axial direction of the magnetic core. The utility model also provides a current sensor with the magnetic core. The magnetic core is not easy to deform; and simultaneously, the corresponding current sensor is also easy to assemble.

Description

The magnetic core and the corresponding current sensor that are used for current sensor

Technical field

The utility model relates to Techniques in Electromagnetic Measurement, relates in particular to current sensor.

Background technology

Current measurement instrument is very extensive in the application in Techniques in Electromagnetic Measurement field.Current measurement instrument is with regard to its principle of work, and can be divided into two big types: the measurement mechanism of tested size of current, for example shunt are confirmed in the voltage drop on known resistance according to tested electric current; And confirm the measurement mechanism of tested size of current according to magnetic field that tested electric current is set up, like the direct measurement mechanism of Hall element.With regard to this measurement mechanism of latter's indication, it comprises the magnetic core with air gap, the magnetic field detector that is arranged in air gap and interlock circuit device.But the magnetic core easy deformation in the routine techniques causes size to be difficult to control and then influence assembling.

The utility model content

The utility model provides a kind of magnetic core that is used for current sensor.Said magnetic core continuous edge is provided with through hole in the main part that said edge surrounded, the axially parallel of the axial and said magnetic core of said through hole.

Preferably, said through hole is non-regular polygon, that is this through hole is polygon, but is not regular polygon.

Preferably, said through hole is an octagon, but is not octagon.

The utility model also provides a kind of current sensor, comprises former limit conductor, magnetic core; Be arranged on the coil on the magnetic core, the air gap relevant with said magnetic core is arranged on the detecting device in the said air gap; Said coil is electrically connected with said detecting device, it is characterized in that, said magnetic core continuous edge; The through hole that forms air gap is set, the axially parallel of the axial and said magnetic core of said through hole in the main part that said edge surrounded.

Magnetic core disclosed in the utility model, because it cuts off by air gap, and just the sub-fraction of main body is run through and formed air gap and the marginal portion is still continuous, and is therefore not yielding.Thereby the described current sensor of the utility model is because its magnetic core is not easy distortion assembling more easily.

Description of drawings

Fig. 1 is conventional closed loop current principle of sensors structural representation.

Fig. 2 is the perspective exploded view of current sensor assembly.

Fig. 3 is the structural representation according to the magnetic core of an example of the utility model.

Embodiment

Further introduce the utility model below in conjunction with accompanying drawing.Need to prove that the accompanying drawing of the utility model is merely indicative icon, in the practical application, each parts, device equidimension size are not exceeded with what illustrate.

Fig. 1 is conventional closed loop current principle of sensors structural representation.As shown in the figure, the closed loop current sensor comprises magnetic core (being also referred to as ring concentrator) 10, former limit conductor 20, and around the secondary coil 11 that magnetic core 10 is provided with, the air gap 12 in the magnetic core 10, air gap 12 cuts off magnetic core 10.In air gap 12, be provided with magnetic field detector 13, wherein outwards draw and associative operation amplifier 15 and compensating circuit such as formation such as power amplifier 16 grades at the two ends of secondary coil 11.As shown in the figure; Former limit conductor 20 passes magnetic core 10, is arranged on detecting device 13 in the air gap 12 is confirmed this electric current I p through the magnetic induction that detects and measure electric current I p (electric current I p is the electric current of former limit conductor 20 of flowing through) and produced when the magnetic field that forms through magnetic core 10 size.

Closed loop current sensor shown in Figure 1 is when being assembled into assembly, and the compensating circuit part generally can be implemented on the printed circuit board (PCB) (PCB), is combined by this pcb board and other parts, and assembling becomes current sensor.

Fig. 2 is the perspective exploded view of current sensor assembly.Briefly, magnetic core 10 is set on the bracing frame 30, and on magnetic core 10 the sheathed again frame 32 that protects, thus bracing frame 30 with protect frame 32 and coat magnetic cores 10.Center on bracing frame 30 and protect frame 32 secondary coil (not shown) is set; Then the above-mentioned a plurality of assemblies that assemble are packed in the housing 3; And PCB 34 also is attached to housing 3, and with magnetic core 10 on coil and be arranged on magnetic core 10 air gap (not shown) thus in detecting device be electrically connected and form compensating circuit.Fig. 2 has just simply illustrated also its assembling process of brief account just of three-dimensional exploded view and preceding text of current sensor assembly; The concrete structure that it will be appreciated by those skilled in the art that the current sensor assembly is not limited thereto; Because of the utility model does not relate to other parts of this current sensor, just seldom do description at this.

Magnetic core 10 in Fig. 1 and current sensor shown in Figure 2 is cut off by air gap 12.In this case, magnetic core 10 easy stress deformations cause size to be difficult to control and then influence assembling.In addition, in the said structure, be placed on around the detecting device 13 in the air gap 12 general all can clad metal the electromagnetic susceptibility device is to the influence of detecting device 13 on every side to avoid, this has also increased certain cost burden to sensor module.

Fig. 3 is the structure according to the magnetic core 40 of an example of the utility model.As shown in the figure, the outer ledge 401 of magnetic core 40 is continuous with inside edge 403, and in the main body 402 that the outer ledge 401 and the inside edge 403 of magnetic core 40 are surrounded, is provided with the through hole 405 that forms air gap.In the application's a non-limiting example,

border

401 and 403 and magnetic core main body 402 can be one.In another non-limiting example of the application, being shaped as of through hole 405 is polygonal, but is not regular polygon; For example this is shaped as and is not orthohexagonal hexagon, perhaps is the octagon of non-octagon.Form air gap through hole 405 axially with the axially parallel of magnetic core, according to the diagram of the utility model, through hole 405 and magnetic core axially all perpendicular to paper.

Current sensor according to one of the utility model exemplary embodiment is compared with the sensor of anticipating shown in Fig. 1; Also comprise former limit conductor, magnetic core, be arranged on these parts such as coil and compensating circuit on the magnetic core; Difference is that the magnetic core in this embodiment is as shown in Figure 3; Have continuous outer ledge and inside edge, in these two main bodys that the edge surrounded, be provided with through hole, this through hole then forms according to the described air gap of this embodiment; Wherein as indicated above, the axially parallel of the axial and magnetic core of through hole.In this embodiment, magnetic field detector is arranged in the said through hole, is arranged on the coil on the magnetic core, and outwards draw to be electrically connected with likes such as operational amplifier and power amplifiers to form compensating circuit at its two ends.Former limit conductor passes magnetic core, and the magnetic induction that the electric current that measure produces when flowing through the magnetic field that this former limit conductor forms is detected and measured by the detecting device that is arranged in the air gap.The example that aforesaid through hole is anticipated as shown in Figure 3 equally is polygonal, but is not regular polygon; For example this shape is hexagon but non-regular hexagon, or octagon but be not octagon; In addition, though other polygon such as quadrilateral, pentagon etc. are not mentioned scope that is included in the utility model and so at this.

Magnetic core disclosed in the utility model, its do not cut off by air gap but continuous edge only the center section of main body be provided with the through hole that forms air gap, just be not easy stress deformation, help the assembling of current sensor like this.In addition, the magnetic core continuous edge makes and is arranged on being protected of the interior detecting device of air gap on every side, avoided the influence of part external electromagnetic.

It will be appreciated by those skilled in the art that, in above-mentioned each example of the utility model, be that example describes with the closed loop current sensor, but the described magnetic core of the disclosure is equally applicable to open-loop current sensor; In the above-mentioned example, magnetic core be shaped as circle, but magnetic core also can be other shape.

Claims

1. a magnetic core that is used in the current sensor is characterized in that, said magnetic core continuous edge is provided with through hole in the main part of said surrounded by edges, the axially parallel of the axial and said magnetic core of said through hole.

2. magnetic core according to claim 1 is characterized in that, said through hole is non-regular polygon.

3. magnetic core according to claim 2 is characterized in that said through hole is an octagon, but is not octagon.

4. a current sensor comprises former limit conductor, magnetic core; Be arranged on the coil on the magnetic core, the air gap relevant with said magnetic core is arranged on the detecting device in the said air gap; Said coil is electrically connected with said detecting device, it is characterized in that, said magnetic core continuous edge; The through hole that forms said air gap is set, the axially parallel of the axial and said magnetic core of said through hole in the main part of said surrounded by edges.

5. current sensor according to claim 4 is characterized in that, said through hole is non-regular polygon.

6. current sensor according to claim 5 is characterized in that said polygon is an octagon, but is not octagon.