A magnetic core structure for a current sensor

Abstract

The utility model relates to sensor magnetic core technical field, specifically disclose a kind of magnetic core structure of current sensor, including magnetic core body and hall chip, the magnetic core body is set to C type, and magnetic core body outer wall is provided with shield sleeve, the shield sleeve size is compatible with the size of magnetic core body, the arc is opened in the shield sleeve outer wall, arc-shaped rubber frame is fixedly installed in the arc, symmetric movable block is horizontally slidably arranged on the arc-shaped rubber frame, damping is arranged between the movable block and arc-shaped rubber frame, sleeve rod is fixedly installed on the movable block, the magnetic core structure of this current sensor, not only can be simply installed to hall chip, save time and effort, improve installation efficiency, but also can be fine-tuned to the horizontal position of hall chip, ensure that hall chip is in air-gap magnetic field center area, effectively eliminate the linearity deviation caused by eccentric installation, effectively improve the precision and stability of current detection, strong practicality.

Description

Technical Field

[0001] This utility model belongs to the field of sensor core technology, and particularly relates to a core structure for a current sensor. Background Technology

[0002] A current sensor is a device that can sense the magnitude of current and convert it into a usable output signal. Its magnetic core structure is a key component, and common types include ring and rectangular cores. They often use high permeability materials to effectively concentrate magnetic lines of force and provide a stable magnetic field path for accurate current measurement.

[0003] In existing current sensor core structures, the Hall chip is difficult to adjust horizontally after installation. It is prone to deviation from the center region of the air gap magnetic field due to installation eccentricity, which in turn causes linearity deviation and seriously affects the accuracy and stability of current detection. Therefore, an improvement is needed. To this end, a new magnetic core structure for current sensors is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a magnetic core structure for a current sensor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a magnetic core structure for a current sensor, comprising a magnetic core body and a Hall chip, wherein the magnetic core body is C-shaped and a shielding sleeve is provided on the outer wall of the magnetic core body, the size of the shielding sleeve being adapted to the size of the magnetic core body, an arcuate channel being formed on the outer wall of the shielding sleeve, an arcuate rubber frame being fixedly installed within the arcuate channel, symmetrical movable blocks being horizontally slidably arranged on the arcuate rubber frame, damping being provided between the movable blocks and the arcuate rubber frame, a sleeve rod being fixedly installed on each movable block, a rubber sleeve being fixedly installed on the inner wall of each sleeve rod, a movable rod being horizontally slidably arranged on each rubber sleeve, damping being provided between the movable rod and the rubber sleeve, a frame being fixedly installed at the end of each movable rod, and a fixing member for fixing the Hall chip being provided on the frame and the Hall chip.

[0006] As a further description of the above solution: by setting up the magnetic core body, Hall chip, shielding sleeve, arc track, arc-shaped rubber frame, movable block, sleeve rod, rubber sleeve, movable rod, frame, and fixing parts to work together, it is not only easy to install the Hall chip, saving time and effort and improving installation efficiency, but also the horizontal position of the Hall chip can be finely adjusted to ensure that the Hall chip is in the center region of the air gap magnetic field, effectively eliminating the linearity deviation caused by installation eccentricity, effectively improving the accuracy and stability of current detection, and making it highly practical.

[0007] Preferably, the fastener includes a mounting opening on the inner wall of the frame, a spring disposed in the mounting opening, a fixing block slidably disposed on the mounting opening, and fixing openings on both sides of the Hall chip.

[0008] As a further description of the above scheme: the components within the fastener are described.

[0009] Preferably, the two ends of the spring are fixedly installed to the frame and the fixing block respectively, and the spring is pressed between the frame and the fixing block. The fixing block and the fixing opening are set as matching arc surfaces.

[0010] As a further description of the above scheme: the connection relationship and shape between the components within the fastener are described.

[0011] Preferably, the frame size is adapted to the side dimensions of the Hall chip.

[0012] As a further description of the above solution: the frame size is adapted to the side size of the Hall chip, which can improve the stability of the Hall chip after installation.

[0013] Preferably, the shielding sleeve is slidably disposed on the magnetic core body.

[0014] As a further description of the above solution: the shielding sleeve is slidably mounted on the magnetic core body, which facilitates easy assembly and disassembly of the shielding sleeve.

[0015] Preferably, the shielding sleeve is made of permalloy.

[0016] As a further description of the above scheme: the shielding sleeve is made of permalloy, which has high magnetic permeability and excellent shielding effect against low-frequency magnetic fields.

[0017] Preferably, the shielding sleeve has a scale on the side of the arc track.

[0018] As a further description of the above solution: the shielding sleeve is provided with a scale on the side of the arc track, which makes it easy to observe and adjust the horizontal position of the Hall chip.

[0019] In summary, compared with the prior art, the beneficial effects of this utility model are as follows: by setting up the magnetic core body, Hall chip, shielding sleeve, arc track, arc-shaped rubber frame, movable block, sleeve rod, rubber sleeve, movable rod, frame, and fixing parts to cooperate, it can not only facilitate the simple installation of Hall chip, saving time and effort and improving installation efficiency, but also finely adjust the horizontal position of Hall chip to ensure that Hall chip is in the center region of air gap magnetic field, effectively eliminate linearity deviation caused by installation eccentricity, effectively improve the accuracy and stability of current detection, and has strong practicality. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2This is a top view of the structural structure of this utility model;

[0022] Figure 3 This is a structural diagram of the frame and Hall chip of this utility model;

[0023] Figure 4 This is a structural diagram of the frame of this utility model;

[0024] Figure 5 This is a side sectional view of the frame structure of this utility model;

[0025] Figure 6 This is a structural diagram of the Hall chip of this utility model.

[0026] Legend:

[0027] 1. Magnetic core body; 2. Hall chip; 3. Shielding sleeve; 4. Arc track; 5. Movable block; 6. Sleeve rod; 7. Movable rod; 8. Frame; 9. Fixing component; 91. Mounting port; 92. Spring; 93. Fixing block; 94. Fixing port. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-6 This utility model provides a technical solution:

[0030] A magnetic core structure for a current sensor includes a magnetic core body 1 and a Hall effect chip 2. The magnetic core body 1 is C-shaped, and a shielding sleeve 3 is provided on the outer wall of the magnetic core body 1. The size of the shielding sleeve 3 is adapted to the size of the magnetic core body 1. An arc-shaped groove 4 is formed on the outer wall of the shielding sleeve 3. An arc-shaped rubber frame is fixedly installed inside the arc-shaped groove 4. A symmetrical movable block 5 is horizontally slidably arranged on the arc-shaped rubber frame. A damping is provided between the movable block 5 and the arc-shaped rubber frame. A sleeve rod 6 is fixedly installed on each movable block 5. A rubber sleeve is fixedly installed on the inner wall of each sleeve rod 6. A movable rod 7 is horizontally slidably arranged on each rubber sleeve. Damping is provided between the movable rod 7 and the rubber sleeve. The ends of the movable rod 7 are all fixedly installed with a frame 8. The frame 8 and the Hall chip 2 are provided with fixing parts 9 for fixing the Hall chip 2. The fixing parts 9 include a mounting port 91 opened in the inner wall of the frame 8, a spring 92 set in the mounting port 91, a fixing block 93 slidably set on the mounting port 91, and fixing ports 94 opened on both sides of the Hall chip 2. The two ends of the spring 92 are fixedly installed with the frame 8 and the fixing block 93 respectively, and the spring 92 is pressed between the frame 8 and the fixing block 93. The fixing block 93 and the fixing port 94 are set as matching arc surfaces.

[0031] In the magnetic core structure of the current sensor, the C-shaped magnetic core body 1 is used to concentrate the magnetic field generated by the measured current, providing a magnetic circuit basis for current detection. The Hall chip 2 is used to sense changes in the magnetic field and convert them into electrical signals to realize current detection. The shielding sleeve 3 on the outer wall of the magnetic core body 1 is used to block external stray magnetic field interference and ensure the stability of the detection environment.

[0032] When the Hall chip 2 needs to be installed, the operator inserts the Hall chip 2 between the two sets of frames 8. As the Hall chip 2 moves into the frame 8, the fixing block 93 is compressed by the squeezing force and the spring 92 moves into the mounting port 91 until the fixing block 93 is aligned with the fixing port 94 on the side of the Hall chip 2. The spring 92 then returns to its original position and pushes the fixing block 93 into the fixing port 94, thus achieving a stable fixation of the Hall chip 2.

[0033] If the horizontal position of Hall chip 2 needs to be adjusted, the frame 8 can be pushed directly so that the movable block 5 slides along the arc 4 of the arc-shaped rubber frame (damping provides stable resistance to prevent slippage). The sleeve rod 6, rubber sleeve and movable rod 7 move synchronously. During the movement, the movable rod 7 slides and retracts on the rubber sleeve, thus completing the adjustment of Hall chip 2.

[0034] The magnetic core structure of this current sensor not only facilitates easy installation of the Hall chip 2, saving time and effort and improving installation efficiency, but also allows for fine adjustment of the horizontal position of the Hall chip 2, ensuring that the Hall chip 2 is located in the center region of the air gap magnetic field. This effectively eliminates linearity deviation caused by installation eccentricity, effectively improving the accuracy and stability of current detection, and making it highly practical.

[0035] The dimensions of the frame 8 are adapted to the side dimensions of the Hall chip 2;

[0036] The dimensions of the frame 8 are adapted to the side dimensions of the Hall chip 2. When the Hall chip 2 is fixed between the two sets of frames 8 by the fastener 9, the inner wall of the frame 8 fits tightly with the side of the Hall chip 2, forming a surface contact support structure. This not only restricts the vertical displacement of the Hall chip 2, but also restricts the horizontal swaying space of the Hall chip 2. Together with the fastener 9, it further enhances the stability of the Hall chip 2 after installation, avoiding chip position displacement due to vibration or mechanical impact, thereby ensuring the long-term reliability of current detection.

[0037] The shielding sleeve 3 is slidably mounted on the magnetic core body 1;

[0038] The shielding sleeve 3 is slidably mounted on the magnetic core body 1. Its inner wall and the outer wall of the magnetic core body 1 are slidably connected through a precision tolerance fit. When it is necessary to install or replace the shielding sleeve 3, the operator can slide the shielding sleeve 3 along the axial direction of the magnetic core body 1 to quickly put it into or take it out of the magnetic core body 1. The disassembly and assembly can be completed without the aid of tools, which simplifies the maintenance process of the shielding sleeve 3.

[0039] Shielding sleeve 3 is made of permalloy;

[0040] The shielding sleeve 3 is made of permalloy. When an external low-frequency magnetic field penetrates the air and approaches the magnetic core body 1, the permalloy shielding sleeve 3 guides the magnetic field lines into its own interior to form a closed loop through its high magnetic permeability. This reduces stray magnetic fields entering the air gap of the magnetic core body 1, reduces the interference of the external magnetic field on the detection signal of the Hall chip 2, and ensures the purity and accuracy of the sensor output signal.

[0041] The shielding sleeve 3 is located on the side of the arc track 4 and has a scale.

[0042] The shielding sleeve 3 is located on the side of the arc track 4 and has a scale. When the operator adjusts the horizontal position of the Hall chip 2, the horizontal position of the Hall chip 2 can be easily observed and adjusted by observing the alignment of the edge of the movable block 5 with the scale.

[0043] Working principle:

[0044] In the magnetic core structure of the current sensor, the C-shaped magnetic core body 1 is used to concentrate the magnetic field generated by the measured current, providing a magnetic circuit basis for current detection. The Hall chip 2 is used to sense changes in the magnetic field and convert them into electrical signals to realize current detection. The shielding sleeve 3 on the outer wall of the magnetic core body 1 is used to block external stray magnetic field interference and ensure the stability of the detection environment.

[0045] When the Hall chip 2 needs to be installed, the operator inserts the Hall chip 2 between the two sets of frames 8. As the Hall chip 2 moves into the frame 8, the fixing block 93 is compressed by the squeezing force and the spring 92 moves into the mounting port 91 until the fixing block 93 is aligned with the fixing port 94 on the side of the Hall chip 2. The spring 92 then returns to its original position and pushes the fixing block 93 into the fixing port 94, thus achieving a stable fixation of the Hall chip 2.

[0046] If the horizontal position of Hall chip 2 needs to be adjusted, the frame 8 can be pushed directly so that the movable block 5 slides along the arc 4 of the arc-shaped rubber frame (damping provides stable resistance to prevent slippage). The sleeve rod 6, rubber sleeve and movable rod 7 move synchronously. During the movement, the movable rod 7 slides and retracts on the rubber sleeve, thus completing the adjustment of Hall chip 2.

[0047] The magnetic core structure of this current sensor not only facilitates the easy installation of the Hall chip 2, saving time and effort and improving installation efficiency, but also allows for fine adjustment of the horizontal position of the Hall chip 2, ensuring that the Hall chip 2 is located in the center region of the air gap magnetic field. This effectively eliminates linearity deviation caused by installation eccentricity, effectively improving the accuracy and stability of current detection, and making it highly practical.

[0048] in,

[0049] The dimensions of the frame 8 are adapted to the side dimensions of the Hall chip 2. When the Hall chip 2 is fixed between the two sets of frames 8 by the fastener 9, the inner wall of the frame 8 is tightly fitted with the side of the Hall chip 2 to form a surface contact support structure. This not only restricts the vertical displacement of the Hall chip 2, but also restricts the horizontal swaying space of the Hall chip 2. Together with the fastener 9, it further enhances the stability of the Hall chip 2 after installation, avoids chip position displacement due to vibration or mechanical impact, and thus ensures the long-term reliability of current detection.

[0050] The shielding sleeve 3 is slidably mounted on the magnetic core body 1. Its inner wall and the outer wall of the magnetic core body 1 are slidably connected through a precision tolerance fit. When it is necessary to install or replace the shielding sleeve 3, the operator can slide the shielding sleeve 3 along the axial direction of the magnetic core body 1 to quickly put it into or take it out of the magnetic core body 1. The disassembly and assembly can be completed without the aid of tools, which simplifies the maintenance process of the shielding sleeve 3.

[0051] The shielding sleeve 3 is made of permalloy. When the external low-frequency magnetic field penetrates the air and approaches the magnetic core body 1, the permalloy shielding sleeve 3 guides the magnetic field lines to its own interior to form a closed loop through its own high magnetic permeability characteristics. This reduces the stray magnetic field entering the air gap of the magnetic core body 1, reduces the interference of the external magnetic field on the detection signal of the Hall chip 2, and ensures the purity and accuracy of the sensor output signal.

[0052] The shielding sleeve 3 is located on the side of the arc track 4 and has a scale. When the operator adjusts the horizontal position of the Hall chip 2, the horizontal position of the Hall chip 2 can be easily observed and adjusted by observing the alignment of the edge of the movable block 5 with the scale.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A magnetic core structure of a current sensor comprising a magnetic core body (1) and a Hall chip (2), characterized in that, The magnetic core body (1) is C-shaped, and a shielding sleeve (3) is provided on the outer wall of the magnetic core body (1). The size of the shielding sleeve (3) is adapted to the size of the magnetic core body (1). An arc track (4) is opened on the outer wall of the shielding sleeve (3). An arc-shaped rubber frame is fixedly installed in the arc track (4). A symmetrical movable block (5) is horizontally slidably arranged on the arc-shaped rubber frame. Damping is provided between the movable block (5) and the arc-shaped rubber frame. A sleeve rod (6) is fixedly installed on each movable block (5). A rubber sleeve is fixedly installed on the inner wall of each sleeve rod (6). A movable rod (7) is horizontally slidably arranged on each rubber sleeve. Damping is provided between the movable rod (7) and the rubber sleeve. A frame (8) is fixedly installed at the end of each movable rod (7). A fixing part (9) for fixing the Hall chip (2) is provided on the frame (8) and the Hall chip (2).

2. A magnetic core structure for a current sensor according to claim 1, characterized in that The fastener (9) includes an installation port (91) opened on the inner wall of the frame (8), a spring (92) disposed in the installation port (91), a fixing block (93) slidably disposed on the installation port (91), and fixing ports (94) opened on both sides of the Hall chip (2).

3. The magnetic core structure of a current sensor according to claim 2, characterized in that, The spring (92) is fixedly installed at both ends to the frame (8) and the fixing block (93) respectively, and the spring (92) is pressed between the frame (8) and the fixing block (93). The fixing block (93) and the fixing opening (94) are set to be compatible arc surfaces.

4. A magnetic core structure for a current sensor according to claim 1, characterized in that, The dimensions of the frame (8) are adapted to the side dimensions of the Hall chip (2).

5. The magnetic core structure of a current sensor according to claim 1, characterized in that, The shielding sleeve (3) is slidably disposed on the magnetic core body (1).

6. The magnetic core structure of a current sensor according to claim 1, characterized in that, The shielding sleeve (3) is made of permalloy.

7. A magnetic core structure for a current sensor according to claim 1, characterized in that The shielding sleeve (3) is provided with a scale on the side of the arc (4).

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