CN104217843B - Hall current sensor and magnet ring thereof, realize Hall current sensor for the method measuring big electric current - Google Patents
Hall current sensor and magnet ring thereof, realize Hall current sensor for the method measuring big electric current Download PDFInfo
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- CN104217843B CN104217843B CN201410512141.1A CN201410512141A CN104217843B CN 104217843 B CN104217843 B CN 104217843B CN 201410512141 A CN201410512141 A CN 201410512141A CN 104217843 B CN104217843 B CN 104217843B
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Abstract
The present invention relates to current sensing device, particularly relate to Hall current sensor part.The present invention proposes a kind of magnet ring, the ring-type core body that this magnet ring is made up of a permeability magnetic material, this magnet ring has the void openings of the radial direction that spacing is Lg, a cut part at this void openings, and make the height d excising residue face at magnet ring void openings be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring.The present invention also proposes a kind of Hall current sensor with above-mentioned magnet ring.And the present invention also proposes a kind of Hall current sensor that realizes for the method measuring big electric current.The Hall current sensor of present invention improvement and magnet ring thereof, it is hereby achieved that bigger effective range, for current detecting field.
Description
Technical field
The present invention relates to current sensing device, particularly relate to Hall current sensor part.
Background technology
Hall current sensor is current measurement mode widely used in power system.Hall current sensor based on magnetic balance type hall principle, i.e. closed loop principle.Refering to shown in Fig. 1, the magnetic flux produced as primary current IP concentrates in magnetic circuit by high-quality magnetic core, Hall element is fixed in air gap detection magnetic flux, by the compensation electric current that the multiturn coil output being wound on magnetic core is reverse, for offsetting the magnetic flux that former limit IP produces so that in magnetic circuit, magnetic flux remains zero；And through the process of particular electrical circuit, the outfan of sensor can export the curent change accurately reflecting primary current.
Refering to being the sectional structure of existing Hall current sensor shown in Fig. 2, specifically include that the housing 1 of a ring-type closing, the ring of the inside of this housing 1 is provided with the ring-type iron core (or claiming magnet ring) 2 of the void openings with a radial direction, in encapsulation is arranged on this housing 1 and be positioned at the void openings of this ring-type iron core 2, and the circuit board (being not drawn in figure) that is arranged in this housing 1 of encapsulation and be installed in the binding post 4(that this housing 1 electrically connects with circuit board outward and be usually 4).
But the magnet ring of existing Hall current sensor exists some parts that have much room for improvement because design is upper, (current measurement) scope of can effectively measuring causing existing Hall current sensor is not enough.
Summary of the invention
Therefore, the present invention is directed to this Hall current sensor proposing a kind of improvement and magnet ring thereof, it is hereby achieved that bigger effective range.
The present invention adopts the following technical scheme that realization:
A kind of magnet ring, the ring-type core body that this magnet ring is made up of a permeability magnetic material, this magnet ring has the void openings of the radial direction that spacing is Lg, a cut part at this void openings, and makes the height d excising residue face at magnet ring void openings less than the magnet ring external diameter R of magnet ring and magnet ring internal diameter r difference.
Wherein, at the void openings of this magnet ring spacing Lg and the adjusted value of height d excising residue face at magnet ring void openings be make its under big current field at the void openings of this magnet ring the magnetic field intensity of two side areas A2 roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings.
A kind of Hall current sensor, specifically include that the housing of a ring-type closing, the ring of the inside of this housing is provided with the magnet ring of the void openings with a radial direction, encapsulate in being arranged on this housing and be positioned at the void openings of this magnet ring, and encapsulate the circuit board being arranged in this housing and be installed in the outer binding post electrically connected with circuit board of this housing, this magnet ring is above-mentioned magnet ring.
A kind of Hall current sensor that realizes, for the method measuring big electric current, comprises the steps:
A, provides a Hall current sensor；
B, the void openings of the radial direction that spacing is Lg is made it have after the magnet ring of this Hall current sensor is carried out otch, this void openings is in a cut part after carrying out line cutting, and makes the height d excising residue face at magnet ring void openings be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring；
C, adjusts the height d excising residue face at spacing Lg at the magnet ring void openings of this magnet ring and/or magnet ring void openings, so that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at its void openings.
The Hall current sensor of present invention improvement and magnet ring thereof, it is hereby achieved that bigger effective range, for current detecting field.
Accompanying drawing explanation
Fig. 1 is the current detecting principle schematic of Hall current sensor；
Fig. 2 is the structural representation of Hall current sensor；
Fig. 3 is existing magnet ring spatial magnetic field schematic diagram under 1500 amperes of electric current；
Fig. 4 is the existing magnet ring curve chart being positioned at magnetic field intensity at the void openings of this magnet ring under 1500 amperes of electric current；
Fig. 5 is magnet ring spatial magnetic field schematic diagram under 1800 amperes of electric current after improvement；
Fig. 6 be improve after the magnet ring curve chart being positioned at magnetic field intensity at the void openings of this magnet ring under 1800 amperes of electric current；
Fig. 7 is a kind of its each parameter of magnet ring mark schematic diagram improving magnet ring shape and structure；
Fig. 8 is the magnetic field distribution figure that the magnet ring of embodiment 1 is measured under big current field；
Fig. 9 is the magnetic field distribution figure that the magnet ring of embodiment 2 is measured under big current field；
Figure 10 is the magnetic field distribution figure that the magnet ring of embodiment 3 is measured under big current field；
Figure 11 is the magnetic field distribution figure that the magnet ring of embodiment 4 is measured under big current field；
Figure 12 is the magnetic field distribution figure that the magnet ring of embodiment 5 is measured under big current field；
Figure 13 is the magnetic field distribution figure that the magnet ring of embodiment 6 is measured under big current field.
Detailed description of the invention
In conjunction with the drawings and specific embodiments, the present invention is further described.
Inventor is through studying and test discovery with keen determination in a large number: after the shape at the void openings to the magnet ring in Hall current sensor is changed, the magnetic conduction distribution that can cause this magnet ring changes, after specific alteration of form, can obtain compare do not do now any alteration of form magnet ring be less susceptible to the effect that magnetic field is saturated, so that apply the Hall current sensor of this improvement magnet ring to may be used for measuring bigger current value.
Refering to Fig. 3 and Fig. 4, it is the curve chart of the magnet ring not doing any alteration of form in existing Hall current sensor spatial magnetic field situation under 1500 amperes of electric current (A) and the magnetic field intensity being positioned at the void openings of this magnet ring respectively.This magnet ring is that the magnet ring of the conventional size of the permalloy material selecting 1J85 model the most frequently used in Hall current sensor is tested, in figure 3 it can be seen that this magnet ring structure its Distribution of Magnetic Field under electric current 1500A has shown substantially enters saturation；It is the transverse axis coordinate of the distance of 0-5mm in the diagram respectively from opening left-to-right at the void openings of this magnet ring, it is fully saturated that this magnet ring structure visible magnetic field at its void openings under electric current 1500A has tended to intensity, and magnetic field intensity can't be varied from along with the difference of void openings position.Thus show from the test result of Fig. 3 and Fig. 4, it is clear that select this Hall current sensor of test cannot accurately measure current value under 1500 amperes (A).
Refering to Fig. 5 and Fig. 6, it is that the shape at the magnet ring (identical with the material of above-mentioned test magnet ring and dimensional parameters) selecting the Hall current sensor identical with above-mentioned Fig. 3 and Fig. 4 void openings to its magnet ring carries out after cutting changes respectively, the curve chart of the spatial magnetic field situation under 1800 amperes of electric current (A) and the magnetic field intensity being positioned at the void openings of this magnet ring.There is Fig. 5 and Fig. 6 visible, the shape at the void openings of magnet ring is carried out the magnet ring after cutting changes at electric current 1800
Under A, Distribution of Magnetic Field shows close to entering saturation, but the most fully saturated (being better than conventional magnet ring Distribution of Magnetic Field situation under 1500A), this magnet ring structure magnetic field at its void openings under electric current 1800A is the most fully saturated, and magnetic field intensity also can have slight change along with the difference of void openings position.As can be seen here, in the case of identical magnet ring material and size, for shape at the void openings of magnet ring carries out the magnet ring structure compared to routine of the improvement magnet ring structure after cutting changes, it is less susceptible to occur magnetic field saturated, such that it is able to for measuring higher current value.
Inventor continues substantial amounts of research work on the basis of the above and finds, is to excise spacing Lg at the height d in residue face, magnet ring external diameter R and magnet ring internal diameter r and magnet ring void openings and have relation at magnet ring void openings as shown in Figure 7 by changing magnet ring shape and structure.Wherein, owing to the magnet ring external diameter R and magnet ring internal diameter r of identical material and the magnet ring of size model are same factors, can not be taken into consideration.Under the magnet ring of identical material and size model, excising spacing Lg at the height d in residue face and magnet ring void openings at magnet ring void openings is the principal element affecting its final magnetic conduction magnetic field distribution.
Inventor finds after further research, spacing Lg at the height d in residue face and/or magnet ring void openings is excised at magnet ring void openings as long as changing, make to record Distribution of Magnetic Field thereon meet certain in the case of, so that the magnet ring structure that improves after Gai Bianing to be not susceptible to magnetic field compared to conventional magnet ring structure saturated, may be used for measuring higher current value.Show through the experimental results: optimal magnet ring structure changes under the effect being such that in big current field, at magnet ring void openings opposite inside region A1 magnetic field intensity and at magnet ring void openings the magnetic field intensity of two side areas A2 the most equal, such magnet ring may be used for measuring bigger electric current.
Enumerate the magnetic field distribution figure that the magnet ring structure after the height d by after spacing Lg at change magnet ring void openings and excising residue face at magnet ring void openings is measured under big current field separately below.The magnet ring of following several embodiments is all to use magnet ring material the most conventional in existing Hall current sensor and size model to test, if magnet ring material is the permalloy material of 1J85 model, the magnet ring external diameter R and magnet ring internal diameter r of magnet ring is 19.5 millimeters (mm) and 13 millimeters respectively.This rule that can refer to of the magnet ring of other magnet ring materials and size model draws, enumerates the most one by one in this.
Embodiment 1: refering to shown in Fig. 8, it is by advanced person's line cutting at the magnet ring void openings of above-mentioned conventional magnet ring, the height d excising residue face at this magnet ring void openings is 6.5mm, then it is adjusted spacing Lg at magnet ring void openings changing, at this magnet ring void openings, spacing Lg changes into 3mm, but carries out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 can be bigger than the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, the most less desirable state of this magnet ring structure.
Embodiment 2: refering to shown in Fig. 9, it is by advanced person's line cutting at the magnet ring void openings of above-mentioned conventional magnet ring, the height d excising residue face at this magnet ring void openings is 6.5mm, then it is adjusted spacing Lg at magnet ring void openings changing, at this magnet ring void openings, spacing Lg changes into 5mm, but carries out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, this magnet ring structure is more satisfactory state.
Embodiment 3: refering to shown in Figure 10, it is by advanced person's line cutting at the magnet ring void openings of above-mentioned conventional magnet ring, the height d excising residue face at this magnet ring void openings is 6.5mm, then it is adjusted spacing Lg at magnet ring void openings changing, at this magnet ring void openings, spacing Lg changes into 8mm, but carries out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 can be less than the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, the most less desirable state of this magnet ring structure.
Embodiment 4: refering to shown in Figure 11, it is that above-mentioned conventional magnet ring is first carried out otch, make it have the magnet ring void openings that spacing Lg at magnet ring void openings is 5mm, the most again it is carried out line cutting, so that the height d excising residue face at this magnet ring void openings is 3.3mm, but carry out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 can be bigger than the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, the most less desirable state of this magnet ring structure.
Embodiment 5: refering to shown in Figure 12, it is that above-mentioned conventional magnet ring is first carried out otch, make it have the magnet ring void openings that spacing Lg at magnet ring void openings is 5mm, the most again it is carried out line cutting, so that the height d excising residue face at this magnet ring void openings is 5mm, but carry out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, this magnet ring structure is more satisfactory state.
Embodiment 6: refering to shown in Figure 13, it is that above-mentioned conventional magnet ring is first carried out otch, make it have the magnet ring void openings that spacing Lg at magnet ring void openings is 5mm, the most again it is carried out line cutting, so that the height d excising residue face at this magnet ring void openings is 10.1mm, but carry out the result figure of magnetic field intensity test.It can be seen that the magnetic field intensity of two side areas A2 can be less than the magnetic field intensity of opposite inside region A1 at magnet ring void openings at this magnet ring void openings, the most less desirable state of this magnet ring structure.
Comparison by above-described embodiment 1-3 is visible, advanced person's line cutting at the magnet ring void openings of magnet ring, in the case of at this magnet ring void openings, the height d in excision residue face is identical, when at adjustment magnet ring void openings, spacing Lg is to suitable size, make the magnetic field intensity of two side areas A2 at this magnet ring void openings roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings, then this magnet ring structure is in more satisfactory state and (is relatively less susceptible to magnetic saturation, it is thus possible to the response of higher current value can be carried out the measurement of bigger current value), the magnet ring of spacing Lg at excessive or too small magnet ring void openings, at its void openings two side areas A2 magnetic field intensity and at magnet ring void openings, the magnetic field intensity of opposite inside region A1 can be variant, and the structure of nonideality.
nullAnd，Comparison by above-described embodiment 4-6 is visible，It is that above-mentioned conventional magnet ring is first carried out otch，Make it have the magnet ring void openings of same magnetic annular space gap opening part spacing Lg，When it is carried out (i.e. excising the height d modulation in residue face at magnet ring void openings to optimal) line cutting of appropriate level the most again，Make the magnetic field intensity of two side areas A2 at this magnet ring void openings roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings，Then this magnet ring structure is in more satisfactory state and (is relatively less susceptible to magnetic saturation，It is thus possible to the response of higher current value can be carried out the measurement of bigger current value)，The magnet ring of spacing Lg at excessive or too small magnet ring void openings，At its void openings two side areas A2 magnetic field intensity and at magnet ring void openings, the magnetic field intensity of opposite inside region A1 can be variant，And the structure of nonideality.
In addition, routine magnet ring is carried out simultaneously otch and line cutting, the height d excising residue face at spacing Lg at its magnet ring void openings and magnet ring void openings is adjusted the most simultaneously, also the magnetic field intensity of two side areas A2 at this magnet ring void openings can be made roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings, it is thus achieved that a magnet ring structure being in more satisfactory state.The magnet ring structure of 2 ideal states from above-described embodiment 2 and embodiment 5, adjusting respectively and excising the height d in residue face at the magnet ring void openings of the magnet ring structure excising the ideal state that the height d in residue face obtains at magnet ring void openings at spacing Lg and magnet ring void openings at spacing Lg and magnet ring void openings is the most all (d=6.5mm, Lg=5mm in embodiment 2 being closer to；D=5mm, lg=5mm in embodiment 5), and wherein on magnet ring wire cut after magnet ring void openings at excise residue face height d be the more leading factor affecting magnet ring effect.
Inventor shows through big measurement, select the magnet ring of above-mentioned routine, i.e. magnet ring material is the permalloy material of 1J85 model, the magnet ring external diameter R and magnet ring internal diameter r of magnet ring is that the magnet ring of 19.5 mm and 13mm carries out otch and line cutting respectively, make to excise the height d in residue face respectively in the range of following at spacing Lg and magnet ring void openings at its magnet ring void openings, specifically: Lg is the scope between 4mm to 6.5mm, d is the scope between 4.5mm to 7.5mm, the magnet ring structure of more satisfactory state can be obtained, compare conventional magnet ring structure and there is bigger magnetic saturation intensity, it is hereby achieved that bigger effective range.
Select other material and the magnet ring of size to carry out otch and line cutting changes and adjusts the height d excising residue face at spacing Lg at magnet ring void openings and/or magnet ring void openings, so that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at its void openings, also magnet ring structure can be made to be in more satisfactory state (being relatively less susceptible to magnetic saturation, it is thus possible to the response of higher current value can be carried out the measurement of bigger current value).
To sum up, the present invention proposes a kind of magnet ring, the ring-type core body that this magnet ring is made up of a permeability magnetic material, this magnet ring (after carrying out otch) has the void openings of the radial direction that spacing is Lg, by (after carrying out line cutting) excision part at this void openings, and the height d excising residue face at magnet ring void openings is made to be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring.Wherein, at the void openings of this magnet ring spacing Lg and the adjusted value of height d excising residue face at magnet ring void openings be make its under big current field at the void openings of this magnet ring the magnetic field intensity of two side areas A2 roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings.
Supplementary notes, the shape of the ring-type core body of this magnet ring, can be with the ring-type core body of right and wrong annulus in addition to the circular core body cited by the various embodiments described above, such as elliptical ring core body, regular polygon core body (such as octagon ring) etc.；The material of the ring-type core body of this magnet ring is in addition to the permalloy material of the conventional 1J85 model cited by the various embodiments described above simultaneously, can also is that other similar permeability magnetic materials, such as materials such as stalloy, other model permalloys, amorphous and nanometer crystal alloy, ferrocart core, ferrum sial, ferrites.
The present invention also proposes a kind of Hall current sensor, this Hall current sensor is similar with existing Hall current sensor structure, specifically include that the housing of a ring-type closing, the ring of the inside of this housing is provided with the magnet ring of the void openings with a radial direction, encapsulate in being arranged on this housing and be positioned at the void openings of this magnet ring, and encapsulate the circuit board being arranged in this housing and be installed in the outer binding post electrically connected with circuit board of this housing, wherein this magnet ring is the magnet ring with said structure.
And the present invention also proposes a kind of Hall current sensor that realizes for the method measuring big electric current, comprise the steps:
A, provides a Hall current sensor；
B, the void openings of the radial direction that spacing is Lg is made it have after the magnet ring of this Hall current sensor is carried out otch, this void openings is in a cut part after carrying out line cutting, and makes the height d excising residue face at magnet ring void openings be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring；
C, adjusts the height d excising residue face at spacing Lg at the magnet ring void openings of this magnet ring and/or magnet ring void openings, so that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at its void openings.
Although specifically showing in conjunction with preferred embodiment and describing the present invention; but those skilled in the art should be understood that; in the spirit and scope of the present invention limited without departing from appended claims; the present invention can be made a variety of changes in the form and details, be protection scope of the present invention.
Claims (2)
1. a magnet ring, the ring-type core body that this magnet ring is made up of a permalloy material, this magnet ring has the void openings of the radial direction that spacing is Lg, a cut part at this void openings, and make the height d excising residue face at magnet ring void openings be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring；At the void openings of this magnet ring spacing Lg and the adjusted value of height d excising residue face at magnet ring void openings be make its under big current field at the void openings of this magnet ring the magnetic field intensity of two side areas A2 roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings.
Magnet ring the most according to claim 1, it is characterized in that: this permalloy material is the permalloy material of 1J85 model, the magnet ring external diameter R and magnet ring internal diameter r of this magnet ring are 19.5 mm and 13mm respectively, the height d in residue face is excised respectively in the range of following at spacing Lg and magnet ring void openings at this magnet ring void openings, specifically: Lg is the scope between 4mm to 6.5mm, d is the scope between 4.5mm to 7.5mm.
3. a Hall current sensor, specifically include that the housing of a ring-type closing, the ring of the inside of this housing is provided with the magnet ring of the void openings with a radial direction, encapsulate in being arranged on this housing and be positioned at the void openings of this magnet ring, and encapsulate the circuit board being arranged in this housing and be installed in the outer binding post electrically connected with circuit board of this housing, it is characterised in that: this magnet ring is the magnet ring described in the claims 1 or 2.
4. realize Hall current sensor for the method measuring big electric current, comprise the steps:
A, provides a Hall current sensor；
B, the void openings of the radial direction that spacing is Lg is made it have after the magnet ring of this Hall current sensor is carried out otch, this void openings is in a cut part after carrying out line cutting, and makes the height d excising residue face at magnet ring void openings be less than magnet ring external diameter R and the magnet ring internal diameter r difference of magnet ring；
C, adjusts the height d excising residue face at spacing Lg at the magnet ring void openings of this magnet ring and/or magnet ring void openings, so that the magnetic field intensity of two side areas A2 is roughly the same with the magnetic field intensity of opposite inside region A1 at magnet ring void openings at its void openings.
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| CN201410512141.1A CN104217843B (en) | 2014-09-29 | 2014-09-29 | Hall current sensor and magnet ring thereof, realize Hall current sensor for the method measuring big electric current |
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| CN201410512141.1A CN104217843B (en) | 2014-09-29 | 2014-09-29 | Hall current sensor and magnet ring thereof, realize Hall current sensor for the method measuring big electric current |
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| CN104217843B true CN104217843B (en) | 2016-08-24 |
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| CN105629047B (en) * | 2015-12-24 | 2018-06-22 | 中国船舶重工集团公司第七一〇研究所 | A kind of closed-loop current sensors |
| CN107516576A (en) * | 2017-10-25 | 2017-12-26 | 德清明宇电子科技有限公司 | A kind of more spacing magnet ring shells and magnetic ring component with plug-in unit |
| CN108445282A (en) * | 2018-06-14 | 2018-08-24 | 东华大学 | A kind of implementation method of integrated current detection and inductive function |
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| DE4028614A1 (en) * | 1990-09-08 | 1992-03-12 | Emh En Messtechnik Gmbh | Measuring large currents with electricity meter - using Hall element in slotin annular ferrite core with main conductor forming current loop |
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