CN114624494A - Split-type sensor head and split-type current sensor - Google Patents
Split-type sensor head and split-type current sensor Download PDFInfo
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- CN114624494A CN114624494A CN202111412682.3A CN202111412682A CN114624494A CN 114624494 A CN114624494 A CN 114624494A CN 202111412682 A CN202111412682 A CN 202111412682A CN 114624494 A CN114624494 A CN 114624494A
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Abstract
The present invention provides a split-type sensor head and a split-type current sensor capable of achieving both excellent detection sensitivity and detection accuracy and ease of operation. The split-type sensor head (1) has a pair of partial heads (4) each including a magnetic core (5) and a magnetic sensor (6), the two partial heads (4) are arranged so as to be capable of switching between a closed state in which one ends (5a) of the two magnetic cores (5) are close to each other and the two magnetic cores (5) are annular as a whole and an open state in which the one ends (5a) of the two magnetic cores (5) are separated from each other, each magnetic core (5) has a slit (9) that extends in the circumferential direction from a position away from the one end (5a) toward the other end (5b) and is open in the axial direction, each magnetic sensor (6) is arranged along the slit (9) within the slit (9), and each magnetic core (5) has a split section (10) that is continuous with the slit (9) and in which the magnetic core (5) is at least partially split in the circumferential direction. The split current sensor (2) has a split sensor head (1) and a detection circuit (3) connected to two magnetic sensors (6).
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority from Japanese patent application No. 2020-.
Technical Field
The present invention relates to a split-type sensor head and a split-type current sensor.
Background
A split-type sensor head used for a split-type current sensor or the like has a pair of partial heads each including a magnetic core and a magnetic sensor, and the two partial heads are arranged so as to be able to switch between a closed state in which one ends of the two magnetic cores are close to each other and the two magnetic cores are annular as a whole and an open state in which one ends of the two magnetic cores are separated from each other (see, for example, patent document 1).
On the other hand, a feedthrough sensor head used for a feedthrough current sensor or the like has an annular magnetic core and a magnetic sensor (see, for example, patent document 2).
The split type sensor head as described above can insert a measurement object such as a wire into the inside of the sensor head by opening the two partial heads, and thus can be easily arranged with respect to the measurement object as compared with the case of the through type sensor head.
Documents of the prior art
Patent document 1: japanese patent laid-open publication No. 2019-168405
Patent document 2: japanese patent laid-open publication No. 2014-215103
In order to improve the detection sensitivity and detection accuracy, it is preferable to dispose the magnetic sensor in a range as long as possible in the circumferential direction. However, as described in patent document 1, when the two partial heads are configured such that the one ends of the two magnetic sensors contact each other when they are in the closed state, one end of the magnetic sensor is exposed to the outside at one end of each partial head. Therefore, the exposed portion needs to be protected from damage and contamination, and thus the operation is difficult.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a divided sensor head and a divided current sensor capable of simultaneously achieving excellent detection sensitivity and detection accuracy and ease of operation.
A split-type sensor head of some embodiments has a pair of partial heads respectively including magnetic cores and magnetic sensors, the two partial heads being arranged so as to be able to switch between a closed state in which one ends of the two magnetic cores are close to each other and the two magnetic cores are annular as a whole and an open state in which the one ends of the two magnetic cores are separated from each other, each of the magnetic cores having a slit that extends in a circumferential direction from a position away from the one end toward the other end and is open in an axial direction, each of the magnetic sensors being arranged along the slit within the slit, each of the magnetic cores having a split portion that is connected to the slit and the magnetic core being at least partially split in the circumferential direction. According to this configuration, since the magnetic sensors are arranged along the slit in the slit, the magnetic sensors can be arranged over a long range in the circumferential direction without exposing one end of the core to the outside. For example, the two magnetic sensors can be arranged over a length of 60% or more of the entire circumference of the two partial heads in the closed state as a whole, and the larger the ratio is, the more the influence on the detection result due to the deviation of the relative positions of the magnetic sensors and the measurement object at the time of measurement can be reduced, thereby improving the detection accuracy. Further, according to this configuration, since each of the cores has the split portion connected to the slit, leakage magnetic flux from the core leaking from the split portion can be received by the magnetic sensor, and the magnetic flux in the magnetic sensor can be increased, so that the detection sensitivity can be improved. Therefore, excellent detection sensitivity and detection accuracy can be achieved together with ease of operation.
In one embodiment, the divided portions are provided in pairs at positions opposing each other with the center axes of the two cores interposed therebetween in the closed state. According to this configuration, since the magnetic flux in the magnetic sensor can be made more uniform in the circumferential direction, the influence on the detection result due to the deviation in the relative position between the magnetic sensor and the measurement target at the time of measurement can be further reduced, and the detection accuracy can be further improved.
In one embodiment, each of the magnetic sensors has a field core and an excitation coil configured to surround the field core. With this configuration, the magnetic sensor that can be arranged in the slit can be realized with a simple configuration.
In one embodiment, each of the magnetic sensors is formed of a flexible substrate including a field core and an excitation coil configured to surround the field core. With this configuration, the thickness of the slit and the magnetic sensor in the radial direction can be reduced, and the divided sensor head can be downsized in the radial direction.
In one embodiment, each of the magnetic cores is formed of laminated steel sheets, and the divided portions have a comb-tooth shape. According to this configuration, the comb-teeth-shaped divided portion can exhibit a magnetic shielding function for shielding magnetic noise from the outside, and thus the detection sensitivity can be improved.
In one embodiment, in each of the magnetic cores, a radial width of the magnetic core is fixed over an entire length in a circumferential direction, and a radial width of the slit is fixed over an entire length in the circumferential direction. With this configuration, the influence on the detection result due to the deviation in the relative position between the magnetic sensor and the measurement target during measurement can be further reduced, and the detection accuracy can be effectively improved while the split sensor head is reduced in size.
In one embodiment, in each of the magnetic cores, a distance between an outer peripheral edge of the slit and an outer peripheral edge of the magnetic core is constant over a full length in a circumferential direction, and a distance between an inner peripheral edge of the slit and an inner peripheral edge of the magnetic core is constant over a full length in the circumferential direction. With this configuration, the influence of the deviation in the relative position between the magnetic sensor and the measurement target during measurement on the detection result can be further reduced, and the detection accuracy can be effectively improved while the split sensor head is reduced in size.
The split-type current sensor of some embodiments has the split-type sensor head and a detection circuit connected to both of the magnetic sensors. According to this structure, excellent detection sensitivity and detection accuracy can be achieved together with ease of operation.
According to the present invention, it is possible to provide a divided sensor head and a divided current sensor capable of simultaneously achieving excellent detection sensitivity and detection accuracy and ease of operation.
Drawings
Fig. 1 is a plan view showing a split-type current sensor according to an embodiment.
Fig. 2 is a perspective view showing a magnetic core of the split type current sensor shown in fig. 1.
Fig. 3 is a plan view showing a magnetic sensor of the split type current sensor shown in fig. 1.
Fig. 4 is a graph showing an analysis result of the split type current sensor shown in fig. 1.
Fig. 5 is a perspective view showing a modification of the core of the split-type current sensor shown in fig. 1.
Description of the reference numerals
1-division type sensor head, 2-division type current sensor, 3-detection circuit, 4-division head, one end of 4-division head, the other end of 4-division head, 5-magnetic core, one end of 5-magnetic core, the other end of 5-magnetic core, 6-magnetic sensor, 7-measurement object, 8-laminated steel plate, 8-steel plate, 9-slit, 10-division portion, 11-field iron core, 12-field coil, 13-flexible substrate, 13-a-magnetic layer, 13-b-conductor-pattern layer, 13-c-filled conductor set, 13-d-substrate main body portion, 13-e-branch portion, 13-f-wiring pattern, 13-g-terminal portion, distance between outer peripheral edge of L1-slit and outer peripheral edge of magnetic core, distance between inner peripheral edge of L2-slit and inner peripheral edge of magnetic core, O-center axis, radial width of W1-magnetic core, radial width of W2-slit.
Detailed Description
Embodiments of the present invention will be described below in detail by way of examples with reference to the accompanying drawings.
The split-type sensor head 1 of the present embodiment shown in fig. 1 is used for a split-type current sensor 2. The split type current sensor 2 has a split type sensor head 1 and a detection circuit 3.
The split type sensor head 1 has a pair of partial heads 4. Each partial head 4 has a magnetic core 5 and a magnetic sensor 6 in the shape of circular arcs.
The two partial heads 4 are configured to be able to switch between a closed state in which the one ends 5a of the two cores 5 are close to each other and the two cores 5 are annular as a whole and an open state in which the one ends 5a of the two cores 5 are separated from each other. That is, in the closed state, the one ends 4a of the two partial heads 4 configuring the one ends 5a of the two cores 5 are close to each other, the two partial heads 4 are annular as a whole, and in the open state, the one ends 4a of the two partial heads 4 are separated from each other. In the example shown in fig. 1, when the closed state is changed to the open state, one (right side in fig. 1) partial head 4 moves from the position indicated by the solid line to the position indicated by the two-dot chain line.
Each of the cores 5 may be formed in a U shape other than an arc shape, and the two cores 5 or the two partial heads 4 may be formed in a ring shape other than a circular ring shape (for example, a polygonal ring shape) as a whole in a closed state. Further, in the present embodiment, the two partial heads 4 have the same length in the circumferential direction as each other, but are not limited thereto. For example, the following structure is also possible: one part head 4 has a length less than half a cycle and the other part head 4 has a length exceeding half a cycle.
The two partial heads 4 are arranged such that the other ends 5b of the two cores 5 approach each other in the closed state and the other ends 5b of the two cores 5 are separated from each other in the open state. That is, the other ends 4b of the two partial heads 4 configuring the other ends 5b of the two cores 5 approach each other in the closed state, the two partial heads 4 are annular as a whole, and the other ends 4b of the two partial heads 4 are separated from each other in the open state.
In the present embodiment, a direction along the central axis O of the entire two cores 5 in the closed state is referred to as an axial direction, a direction around the central axis O is referred to as a circumferential direction, and a direction along a straight line orthogonal to the central axis O is referred to as a radial direction.
Each of the partial heads 4 has a not-shown case that houses the magnetic core 5 and the magnetic sensor 6. The other ends 4b of the two sub heads 4 are coupled to each other by a hinge, not shown, having a rotation shaft extending in the axial direction. That is, the two sub heads 4 are configured to be openable and closable by a hinge. The two partial heads 4 are not limited to this, and may be configured to be detachable from each other, and may be configured to be brought into a closed state by being attached to each other and brought into an open state by being detached from each other, for example.
By bringing the two partial heads 4 into the open state, the measurement target 7 such as an electric wire in which current flows in the axial direction can be inserted into the inside of the two partial heads 4 through the gap between the one ends 4a of the two partial heads 4. Therefore, as shown in fig. 1, the split sensor head 1 can be easily arranged with respect to the measurement object 7.
As shown in fig. 2, each magnetic core 5 is formed by a laminated steel plate 8 composed of a plurality of laminated steel plates 8 a. As shown in fig. 1 and 2, each core 5 has a slit 9 that extends in the circumferential direction from a position away from one end 5a to the other end 5b and is open on both sides in the axial direction. The slit 9 is not limited to a structure that opens on both axial sides, and may be a structure that opens on one axial side and closes on the other axial side.
In each core 5, the radial width W1 of the core 5 is constant over the entire length in the circumferential direction, and the radial width W2 of the slit 9 is constant over the entire length in the circumferential direction. In each magnetic core 5, a distance L1 between the outer peripheral edge of the slit 9 and the outer peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction, and a distance L2 between the inner peripheral edge of the slit 9 and the inner peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction.
Each core 5 has a split portion 10 connected to the slit 9 at one circumferential position, and the core 5 is split in the circumferential direction. Each core 5 may have the divided portion 10 at two or more locations in the circumferential direction. The divided portions 10 are provided in pairs at positions facing each other across the center axis O.
The divided portions 10 are provided on both the radially inner side and the radially outer side with respect to the slit 9. Each of the divided portions 10 may be provided on only one of the radial inner side and the radial outer side of the slit 9. Each of the divided portions 10 has a straight line shape extending straight in the axial direction. That is, the divided surfaces formed on all the steel plates 8a are arranged in the axial direction.
Each magnetic sensor 6 is disposed along the slit 9 in the slit 9. Further, as shown in fig. 3, each magnetic sensor 6 is formed of a flexible substrate 13, and the flexible substrate 13 includes a field core 11 and an excitation coil 12 arranged to surround the field core 11.
The flexible substrate 13 includes: a substrate body layer including a strip-shaped magnetic layer 13a that functions as the field core 11 and extends linearly, and an insulator that covers the magnetic layer 13 a; a pair of conductor pattern layers 13b provided on both sides in the thickness direction of the substrate main body layer; the filled conductor group 13c is formed of a conductor filled in a through hole group penetrating the substrate body layer, and the excitation coil 12 is formed of the pair of conductor pattern layers 13b and the filled conductor group 13 c.
Further, the flexible substrate 13 includes: a strip-shaped substrate body 13d which is composed of a substrate body layer, a pair of conductor pattern layers 13b, and a filled conductor group 13c, and which extends linearly; and a branch portion 13e that branches from the substrate main body portion 13 d. The branch portion 13e is provided with terminal portions 13g connected to both ends of the excitation coil 12 via wiring patterns 13 f. The terminal portion 13g is composed of a positive electrode terminal and a negative electrode terminal. The arrangement of the terminal portions 13g is not limited to this, and the flexible substrate 13 may have a structure without the branch portions 13e, for example.
The flexible substrate 13 can be bent in the thickness direction due to its flexibility. Therefore, by bending the substrate main body portion 13d in the thickness direction, the substrate main body portion 13d can be inserted and arranged in the slit 9 extending in the circumferential direction, as shown in fig. 1.
As shown in fig. 1, the detection circuit 3 is connected to the two magnetic sensors 6, and outputs a current value or a voltage value according to the magnitude of a current flowing through the measurement target 7 disposed inside the two partial heads 4 in the closed state. When a direct current or an alternating current flows through the measurement target 7, the two field cores 11 of the two magnetic sensors 6 are excited, and electromotive forces associated with the current flowing through the measurement target 7 are generated in the two field coils 12. The detection circuit 3 outputs a current value or a voltage value associated with the electromotive force. Therefore, the split type current sensor 2 can measure the magnitude of the current flowing through the measurement object 7.
According to the split-type sensor head 1 of the present embodiment, since the respective magnetic sensors 6 are arranged along the slit 9 in the slit 9, the respective magnetic sensors 6 can be arranged over a long range in the circumferential direction without exposing the one end 5a of the core 5 to the outside. For example, the two magnetic sensors 6 may be arranged over 60% or more of the entire circumference of the two partial heads 4 in the closed state. As shown in fig. 4, the longer the field core 11 is, the larger the magnetic flux generated in the field core 11 is, and therefore, in order to improve the detection sensitivity, the longer the circumferential length of the two magnetic sensors 6 is, the better. Fig. 4 shows an analysis result when the direct current 1A is applied to the measurement object 7 in the split-type current sensor 2 shown in fig. 1. More specifically, fig. 4 shows the result of calculating the circumferential component (θ component) of the magnetic flux generated in the field core 11 for each ratio by changing the ratio of the entire circumferential length of the two magnetic sensors 6 to the entire circumferential length of the two partial heads 4 in the closed state. Further, the longer the field core 11, that is, the magnetic sensor 6, is, the less the influence on the detection result is caused by the positional deviation of the measurement object 7 disposed inside the two cores 5 in the closed state from the center axis O (that is, the deviation of the relative position of the magnetic sensor 6 and the measurement object 7 at the time of measurement). Therefore, in order to improve the detection accuracy, the longer the circumferential length of the magnetic sensor 6 is, the better.
Further, according to the split-type sensor head 1 of the present embodiment, since each core 5 has the split portion 10 connected to the slit 9, leakage magnetic flux from the core 5 leaking from the split portion 10 can be received by the magnetic sensor 6, and the magnetic flux in the magnetic sensor 6 can be increased.
Therefore, according to the split-type sensor head 1 of the present embodiment, excellent detection sensitivity and detection accuracy can be achieved at the same time, and ease of operation can be achieved.
Further, according to the present embodiment, since the dividing portions 10 are provided in pairs at the positions facing each other with the center axis line O interposed therebetween in the closed state, the magnetic flux in the magnetic sensor 6 can be made uniform in the circumferential direction, and therefore, the influence on the detection result due to the deviation in the relative position between the magnetic sensor 6 and the measurement target 7 at the time of measurement can be further reduced, and the detection accuracy can be further improved.
Further, according to the present embodiment, since each magnetic sensor 6 includes the field core 11 and the excitation coil 12, the magnetic sensor 6 that can be disposed in the slit 9 can be realized with a simple configuration.
Further, according to the present embodiment, since each magnetic sensor 6 is formed of the flexible substrate 13 including the field core 11 and the field coil 12, the radial thickness of the slit 9 and the magnetic sensor 6 can be reduced, and the divided sensor head 1 can be downsized in the radial direction.
Further, according to the present embodiment, each core 5 has the following structure: since the radial width W1 of the core 5 is fixed over the entire length in the circumferential direction and the radial width W2 of the slit 9 is fixed over the entire length in the circumferential direction, the influence on the detection result due to the deviation in the relative position between the magnetic sensor 6 and the measurement object 7 during measurement can be further reduced, and the detection accuracy can be effectively improved while the split sensor head 1 is reduced in size.
Further, according to the present embodiment, each core 5 has the following structure: since the distance L1 between the outer peripheral edge of the slit 9 and the outer peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction and the distance L2 between the inner peripheral edge of the slit 9 and the inner peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction, the influence on the detection result due to the deviation in the relative positions of the magnetic sensor 6 and the measurement target 7 during measurement can be further reduced, and the size reduction of the split sensor head 1 can be achieved and the detection accuracy can be effectively improved.
Further, the split-type current sensor 2 of the present embodiment includes the split-type sensor head 1 of the present embodiment and the detection circuit 3 connected to the two magnetic sensors 5, and thus can achieve both excellent detection sensitivity and detection accuracy and ease of operation.
In the present embodiment, each core 5 is formed of laminated steel sheets 8 and the split portions 10 are linear, but as in the modification shown in fig. 5, the split portions 10 may have a comb-tooth-like structure. That is, the following structure is also possible: the divided surfaces formed on all the steel plates 8a are alternately shifted in the axial direction between one side and the other side in the circumferential direction for each or a plurality of steel plates 8 a. According to this configuration, the comb-teeth-shaped divided portion 10 can be made to exhibit a magnetic shielding function for shielding magnetic noise from the outside, and thus the detection sensitivity can be further improved.
The above embodiment is an example of the present invention, and various modifications may be made.
For example, the divided sensor head 1 and the divided current sensor 2 of the above embodiment may be variously modified as described below.
The split-type sensor head 1 of the above embodiment includes a pair of partial heads 4 each including a core 5 and a magnetic sensor 6, the two partial heads 4 are arranged so as to be capable of switching between a closed state in which one ends 5a of the two cores 5 are close to each other and the two cores 5 are annular as a whole and an open state in which the one ends 5a of the two cores 5 are separated from each other, each core 5 has a slit 9 extending in the circumferential direction from a position away from the one end 5a toward the other end 5b and opening in the axial direction, each magnetic sensor 6 is arranged along the slit 9 in the slit 9, and each core 5 has a split portion 10 connected to the slit 9 and dividing the core 5 at least partially in the circumferential direction, and various modifications can be made as long as the above configuration is adopted.
However, it is preferable that the divided portions 10 be provided in pairs at positions facing each other with the center axis O of the two cores 5 interposed therebetween in the closed state. Further, each magnetic sensor 6 preferably has a field core 11 and an excitation coil 12 arranged so as to surround the field core 11. Further, it is preferable that each of the magnetic sensors 6 is formed of a flexible substrate 13, and the flexible substrate 13 includes a field core 11 and an excitation coil 12 arranged to surround the field core 11. Preferably, each magnetic core 5 is formed of laminated steel sheets 8, and the divided portions 10 are comb-shaped. In each of the cores 5, the radial width W1 of the core 5 is preferably constant over the entire length in the circumferential direction, and the radial width W2 of the slit 9 is preferably constant over the entire length in the circumferential direction. In each magnetic core 5, preferably, a distance L1 between the outer peripheral edge of the slit 9 and the outer peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction, and a distance L2 between the inner peripheral edge of the slit 9 and the inner peripheral edge of the magnetic core 5 is constant over the entire length in the circumferential direction.
The split-type current sensor 2 of the above embodiment may be modified in various ways as long as it includes the split-type sensor head 1 and the detection circuit 3 connected to the two magnetic sensors 6.
Claims (5)
1. A divided type sensor head is characterized in that,
having a pair of partial heads each comprising a magnetic core and a magnetic sensor,
the two partial heads are configured to be capable of switching a closed state in which one ends of the two cores are close to each other and the two cores are annular as a whole and an open state in which the one ends of the two cores are separated from each other,
each of the magnetic cores has a slit that extends in a circumferential direction from a position away from the one end toward the other end and is open in an axial direction,
each of the magnetic sensors is disposed along the slit within the slit,
each of the cores has a dividing portion connected to the slit and at least partially divided in the circumferential direction.
2. The split sensor head according to claim 1, wherein the split portions are provided in pairs at positions opposing each other across center axes of the two cores in the closed state.
3. The split sensor head according to claim 1 or 2, wherein each of the magnetic sensors is formed of a flexible substrate including a field core and a field coil configured to surround the field core.
4. The split sensor head according to any one of claims 1 to 3,
each of the magnetic cores is formed of laminated steel sheets,
each of the divided portions is comb-shaped.
5. A split-type current sensor characterized by comprising:
a segmented sensor head as claimed in any one of claims 1 to 4; and
and the detection circuit is connected with the two magnetic sensors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020207076A JP7281442B2 (en) | 2020-12-14 | 2020-12-14 | Split type sensor head and split type current sensor |
| JP2020-207076 | 2020-12-14 |
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| Publication Number | Publication Date |
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| CN114624494A true CN114624494A (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111412682.3A Pending CN114624494A (en) | 2020-12-14 | 2021-11-25 | Split-type sensor head and split-type current sensor |
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| JP (1) | JP7281442B2 (en) |
| CN (1) | CN114624494A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3962784B2 (en) | 2003-02-26 | 2007-08-22 | テクトロニクス・インコーポレイテッド | Current probe |
| JP4840964B2 (en) | 2005-08-23 | 2011-12-21 | 日置電機株式会社 | Fluxgate element and current sensor |
| KR100965818B1 (en) | 2008-05-13 | 2010-06-24 | 태화트랜스 주식회사 | Clamp-type current sensor with a rogowski coil |
| EP2562551A1 (en) | 2010-03-31 | 2013-02-27 | Omron Corporation | Magnetic core, current sensor provided with the magnetic core, and current measuring method |
| JP5797101B2 (en) | 2011-09-09 | 2015-10-21 | 日置電機株式会社 | Magnetic sensor and current measuring device |
| JP6338489B2 (en) | 2014-08-20 | 2018-06-06 | 日置電機株式会社 | Sensor component, current sensor and current measuring device |
| GB2546532B (en) | 2016-01-22 | 2018-03-21 | Gmc I Prosys Ltd | Measurement device |
| JP6505653B2 (en) | 2016-10-14 | 2019-04-24 | 横河電機株式会社 | Excitation core, sensor head and current sensor |
| JP7061421B2 (en) | 2018-01-24 | 2022-04-28 | 横河電機株式会社 | Magnetic sensor, sensor head and current sensor |
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| JP2022094190A (en) | 2022-06-24 |
| JP7281442B2 (en) | 2023-05-25 |
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