CN113970663A - Magnetic core for closed-loop Hall current sensor - Google Patents
Magnetic core for closed-loop Hall current sensor Download PDFInfo
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- CN113970663A CN113970663A CN202111248859.0A CN202111248859A CN113970663A CN 113970663 A CN113970663 A CN 113970663A CN 202111248859 A CN202111248859 A CN 202111248859A CN 113970663 A CN113970663 A CN 113970663A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention discloses a magnetic core for a closed-loop Hall current sensor, belongs to the technical field of current sensors, and aims to solve the problems that a winding coil of the existing structure is difficult to wind on a plastic sheath, and the existing structure easily influences the performance of the closed-loop Hall current sensor. The magnetic gathering ring is composed of a plurality of U-shaped magnetic sheets, two sides of each U-shaped magnetic sheet are respectively a long side and a short side, the long sides of the U-shaped magnetic sheets are mutually overlapped to form a long end, the short sides which are not overlapped form 2 short ends, and the 2 short ends are oppositely arranged; the second convex block is sleeved in the middle of the long strip-shaped structure, two ends of the long strip-shaped structure are respectively sleeved with the first convex block, a mounting hole is formed in the second convex block, the mounting hole is communicated with the long strip-shaped structure, and the Hall element enters the middle of the long strip-shaped structure from the mounting hole; each short end part is inserted from two ends of the strip-shaped structure, and the opposite short end parts are respectively attached to two surfaces of the Hall element; the winding coil is wound on the strip-shaped structure. The method is used for detecting the current state when the aircraft launches and flies.
Description
Technical Field
The invention relates to a magnetic core structure in a Hall current sensor, and belongs to the technical field of current sensors.
Background
Closed-loop hall current sensors are widely used in the field of current detection and various fields in which a current is a control target. The closed-loop Hall current sensor generally comprises a Hall element, a magnetic core, a circuit on a PCB and a sensor shell. The magnetic core comprises a winding coil, a coil framework and a magnetism gathering ring. The closed-loop Hall current sensor magnetic core in the current market is generally formed by processing a soft magnetic material into a flaky strip material by a machining means, stacking and fastening the flaky strip material, and then forming a magnetic gathering ring by opening an air gap on the flaky strip material. The magnetic gathering ring is sleeved with a plastic sheath, and a winding coil is wound on the plastic sheath to form a magnetic core.
The above core design suffers from the following problems: the plastic sheath is added on the magnetic gathering ring, so that the section of the magnetic gathering ring is increased, the path of the winding coil is lengthened, the internal resistance of the winding coil is increased, the anti-saturation capacity of the magnetic core is deteriorated, and the linear range of the closed-loop Hall current sensor is reduced. In order to reduce the internal resistance of the winding coil, the wire diameter of the winding coil must be increased, which increases the sensor volume and weight of the closed-loop hall current, is not favorable for miniaturization of the sensor, consumes more material, and results in increased product cost. In addition, the magnetic core is difficult to wind a winding coil, and the uniform winding of the coil is difficult to maintain, and when a Hall element is inserted into an air gap of the magnetic core, the installation consistency cannot be guaranteed, and the magnetic core is not easy to be installed and fixed with a PCB (printed Circuit Board), so that the performance of the closed-loop Hall current sensor is negatively affected. In addition, the cost of the soft magnetic material used for manufacturing the magnetic gathering ring is too high, and the production cost is also increased.
Disclosure of Invention
The invention aims to solve the problems that a winding coil of the existing structure is difficult to wind because the winding coil is wound on a plastic sheath, and the existing structure easily influences the performance of a closed-loop Hall current sensor, and provides a magnetic core for the closed-loop Hall current sensor.
A magnetic core for a closed-loop Hall current sensor comprises a winding coil, a coil framework and a magnetic gathering ring,
the magnetic gathering ring is composed of a plurality of U-shaped magnetic sheets, two sides of each U-shaped magnetic sheet are respectively a long side and a short side, the long sides of the U-shaped magnetic sheets are mutually overlapped to form a long end part, the short sides which are not overlapped form 2 short end parts, and the 2 short end parts are oppositely arranged;
the coil framework comprises a strip-shaped structure, 2 first lugs and 1 second lug, wherein the strip-shaped structure is hollow inside, the second lug is sleeved in the middle of the strip-shaped structure, two ends of the strip-shaped structure are respectively sleeved with the first lug, and the strip-shaped structure, the 2 first lugs and the 1 second lug are of an integrated structure;
the second bump is provided with a mounting hole which is communicated with the strip-shaped structure, and the Hall element enters the middle part of the strip-shaped structure from the mounting hole;
each short end part is inserted from two ends of the strip-shaped structure, and the opposite short end parts are respectively attached to two surfaces of the Hall element;
the winding coil is wound on the strip-shaped structure.
The invention has the beneficial effects that:
1. the assembled structure design of the magnetic core is beneficial to winding and positioning of a winding coil, the cross section of the quasi-rectangular annular magnetic core in the magnetic gathering ring without the plastic sheath is rectangular, so that under the condition of the same wire diameter, the number of turns of the coil on the magnetic gathering ring is more, the range of the sensor is wider, the path of the coil is shorter, the internal resistance is lower, the linear range of the sensor is larger, the anti-saturation capacity is enhanced, and the size of the current sensor can be greatly reduced by the structural design.
2. The magnetic gathering ring is inserted on the coil framework through the split design, the existing plastic sheath is removed, the winding difficulty of the winding coil is reduced, the production efficiency is improved, and the manufacturing cost is reduced. The magnetic gathering ring is made of permalloy by adopting a machining process, the response speed of the current sensor is high, the consistency among the sheets is good, and the manufacturing cost is greatly reduced.
3. The second bump is arranged in the middle of the coil framework, and the mounting hole formed in the second bump is used for avoiding the problem that the Hall element touches the magnetic core when being mounted, so that the quality problems such as device damage and the like are caused, and also ensuring that the Hall element can be automatically aligned when being mounted, so that the problem that the mounting consistency of the sensor is influenced due to incomplete alignment between the Hall element and the air gap, and performance indexes such as sensitivity, precision and the like are avoided. The coil framework is provided with the mounting holes for mounting and positioning the Hall element, so that the Hall element can be guaranteed to be always positioned at the geometric center of the gap of the magnetic core, the mounting consistency is good, and the performance consistency of the sensor is guaranteed.
The magnetic core for the closed-loop Hall current sensor can be applied to severe environments such as high impact and high temperature.
The closed-loop Hall current sensor manufactured by the magnetic core is mainly used for measuring current parameters in an aircraft, the working temperature range is-40-125 ℃, and the measurable maximum current is 200A. The invention can be applied to the technical field of sensors and provides technical support for the current state detection problem during launching and flying of an aircraft.
The magnetic core for the closed-loop Hall current sensor has the advantages of small size, low cost, simple process and the like, the consistency of the installation and assembly of the follow-up closed-loop Hall current sensor is ensured, and the problem that a magnetic core assembly is not easy to be accurately installed and fixed with a Hall element is solved.
Drawings
FIG. 1 is a top view of a magnetic core for a closed loop Hall current sensor;
FIG. 2 is a top view of a flux ring;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a structural view of a single U-shaped magnetic sheet;
FIG. 5 is a top view of the bobbin;
FIG. 6 is a side view of FIG. 5;
fig. 7 is a view from right below of fig. 5.
Detailed Description
Example (b):
the present embodiment is described with reference to fig. 1 to 7, and is a magnetic core for a closed-loop hall current sensor, the magnetic core includes a winding coil 1, a coil skeleton 2 and a magnetism-gathering ring 3,
the magnetic gathering ring 3 is composed of 10U-shaped magnetic sheets 4, two sides of each U-shaped magnetic sheet 4 are called long sides and short sides, the long sides and the short sides are unequal, the long sides of the 10U-shaped magnetic sheets 4 are mutually overlapped to form long end parts, the non-overlapped short sides form 2 short end parts, and the 2 short end parts are oppositely arranged;
the coil framework 2 comprises a strip-shaped structure 2-1 with a hollow interior, 2 first bumps 2-2 and 1 second bumps 2-3, the second bumps 2-3 are sleeved in the middle of the strip-shaped structure 2-1, two first bumps 2-2 are respectively sleeved at two ends of the strip-shaped structure 2-1, and the strip-shaped structure 2-1, the 2 first bumps 2-2 and the 1 second bumps 2-3 are of an integrated structure;
a mounting hole 5 is formed in the second bump 2-3, the mounting hole 5 is communicated with the strip-shaped structure 2-1, and the Hall element enters the middle of the strip-shaped structure 2-1 from the mounting hole 5;
each short end part is inserted from two ends of the strip-shaped structure 2-1, and the 2 short end parts are respectively attached to two surfaces of the Hall element;
the winding coil 1 is wound on the strip-shaped structure 2-1.
In a preferred embodiment, the material of the bobbin 2 is teflon.
In a preferred embodiment, as shown in fig. 1, a winding coil is wound on a coil frame 2 by using an automatic winding machine, the number of turns of the winding coil 1 is 1000, the diameter of the winding coil is 0.06mm, the material of the winding coil is copper, and polyimide is coated on the outer portion of the copper wire to serve as an insulation layer and a heat insulation layer.
In the preferred embodiment, the U-shaped magnetic sheet 4 is manufactured by adopting a machining process, and the U-shaped magnetic sheet 4 is made of permalloy.
In a preferred embodiment, each U-shaped magnetic sheet 4 comprises a long edge, a short edge and a bottom edge, the long edge, the short edge and the bottom edge form a U shape, the long edge and the short edge are oppositely arranged, an included angle between the long edge and the bottom edge is 90 degrees, and an included angle between the short edge and the bottom edge is 90 degrees.
In this embodiment, the first bump 2-2 is used to prevent the winding coil 1 from coming off; a second bump 2-3 is arranged in the middle of the coil framework 2, and a mounting hole 5 for accommodating a Hall element is formed in the second bump 2-3;
as shown in fig. 2 and 3, when the hall element is mounted, the long end parts of 10U-shaped magnetic sheets 4 are overlapped with each other, 5U-shaped magnetic sheets are respectively arranged at 2 short end parts, 5U-shaped magnetic sheets are respectively inserted into the middle part of the strip-shaped structure 2-1 from two ends of the strip-shaped structure 2-1 with a hollow interior, and because a gap is formed between the 2 short end parts, the 2 short end parts also have a gap in the strip-shaped structure 2-1 with a hollow interior, the hall element is just placed in the gap through a mounting hole, the hall element is a common chip on the market, the hall element is mounted in the gap, and the front and the back of the hall element just contact with the two short end parts respectively after the hall element is mounted. The coil framework and the magnetic sheets are accurately processed, so that the magnetic gathering ring can be accurately positioned in the coil framework; therefore, the relative distance and the installation angle between the magnetic gathering ring and the Hall element can be ensured, and the problem of poor output consistency of the current sensor caused by poor assembly consistency is avoided.
The short ends of the current sensor 2 have gaps therebetween, and the gaps are too wide or too narrow to affect the overall performance of the current sensor, so the current sensor is empirically installed with a suitable gap. In addition, if not adopting coil skeleton, directly with the coil winding on square gather magnetic ring piece, can lead to the coil winding inhomogeneous because of actual technology, and this application lets the coil evenly wind as far as on the skeleton, can strengthen magnetic field homogeneity and stability through hall device, occupation space in also can the unnecessary sensor simultaneously. In addition, the long end parts of 10U-shaped magnetic sheets 4 are overlapped, and the short end parts of the left side and the right side are respectively provided with 5U-shaped magnetic sheets 4 which can extend into the coil frame.
The middle part of the coil framework is provided with a second bump 2-3, and a mounting hole 5 for accommodating the Hall element is formed in the second bump 2-3, so that the damage of a device caused by the friction between the Hall element and the magnetism gathering ring in the assembling process is avoided, the Hall element and the magnetism gathering ring can be accurately positioned, and the performance reduction of the sensor caused by inaccurate positioning is avoided.
Claims (6)
1. A magnetic core for a closed-loop Hall current sensor is characterized in that the magnetic core comprises a winding coil (1), a coil framework (2) and a magnetic gathering ring (3),
the magnetic gathering ring (3) is composed of a plurality of U-shaped magnetic sheets (4), two sides of each U-shaped magnetic sheet (4) are called long sides and short sides, the long sides of the plurality of U-shaped magnetic sheets (4) are mutually overlapped to form long end parts, the short sides which are not overlapped form 2 short end parts, and the 2 short end parts are oppositely arranged;
the coil framework (2) comprises a strip-shaped structure (2-1) with a hollow interior, 2 first bumps (2-2) and 1 second bumps (2-3), the second bumps (2-3) are sleeved in the middle of the strip-shaped structure (2-1), two ends of the strip-shaped structure (2-1) are respectively sleeved with the first bumps (2-2), and the strip-shaped structure (2-1), the 2 first bumps (2-2) and the 1 second bumps (2-3) are of an integrated structure;
a mounting hole (5) is formed in the second bump (2-3), the mounting hole (5) is communicated with the long-strip-shaped structure (2-1), and the Hall element enters the middle of the long-strip-shaped structure (2-1) from the mounting hole (5);
each short end part is inserted from two ends of the strip-shaped structure (2-1), and the 2 short end parts are respectively attached to two surfaces of the Hall element;
the winding coil (1) is wound on a strip-shaped structure (2-1) which is hollow inside.
2. The closed-loop Hall current sensor magnetic core according to claim 1, wherein the material of the bobbin (2) is Teflon.
3. The closed-loop Hall current sensor magnetic core according to claim 1, wherein the winding coil (1) has 1000 turns, a diameter of 0.06mm, and is made of copper, and the copper wire is coated with polyimide as an insulating and heat-insulating layer.
4. A closed-loop hall current sensor core as claimed in claim 1, characterized in that the U-shaped magnetic sheet (4) is permalloy.
5. A closed-loop hall current sensor core as defined in claim 1, wherein the flux ring (3) is composed of 10 magnetic sheets.
6. The closed-loop Hall current sensor magnetic core according to claim 1, wherein each U-shaped magnetic sheet (4) comprises a long side, a short side and a bottom side, the long side, the short side and the bottom side form a U-shape, the long side and the short side are oppositely arranged, the included angle between the long side and the bottom side is 90 degrees, and the included angle between the short side and the bottom side is 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111248859.0A CN113970663A (en) | 2021-10-26 | 2021-10-26 | Magnetic core for closed-loop Hall current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111248859.0A CN113970663A (en) | 2021-10-26 | 2021-10-26 | Magnetic core for closed-loop Hall current sensor |
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| Publication Number | Publication Date |
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| CN113970663A true CN113970663A (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111248859.0A Pending CN113970663A (en) | 2021-10-26 | 2021-10-26 | Magnetic core for closed-loop Hall current sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594340A (en) * | 2024-01-15 | 2024-02-23 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202711934U (en) * | 2012-01-19 | 2013-01-30 | 邹高芝 | Axisymmetric magnetic circuit and magnetic core coil block for full printed circuit board (PCB) installation type high-precision closed loop type Hall current transducer |
| CN104520721A (en) * | 2012-01-19 | 2015-04-15 | 邹高芝 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
| CN205992012U (en) * | 2015-12-31 | 2017-03-01 | 深圳青铜剑科技股份有限公司 | A kind of closed-loop Hall current sensor |
| CN106908636A (en) * | 2017-01-23 | 2017-06-30 | 宁波中车时代传感技术有限公司 | A kind of novel magnetic circuit |
| CN112834801A (en) * | 2021-03-03 | 2021-05-25 | 南京托肯电子科技有限公司 | Magnetic core does not have sheath mounting structure |
-
2021
- 2021-10-26 CN CN202111248859.0A patent/CN113970663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202711934U (en) * | 2012-01-19 | 2013-01-30 | 邹高芝 | Axisymmetric magnetic circuit and magnetic core coil block for full printed circuit board (PCB) installation type high-precision closed loop type Hall current transducer |
| CN104520721A (en) * | 2012-01-19 | 2015-04-15 | 邹高芝 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
| CN205992012U (en) * | 2015-12-31 | 2017-03-01 | 深圳青铜剑科技股份有限公司 | A kind of closed-loop Hall current sensor |
| CN106908636A (en) * | 2017-01-23 | 2017-06-30 | 宁波中车时代传感技术有限公司 | A kind of novel magnetic circuit |
| CN112834801A (en) * | 2021-03-03 | 2021-05-25 | 南京托肯电子科技有限公司 | Magnetic core does not have sheath mounting structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594340A (en) * | 2024-01-15 | 2024-02-23 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
| CN117594340B (en) * | 2024-01-15 | 2024-04-16 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
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Application publication date: 20220125 |