WO2014141680A1 - 電流センサ - Google Patents
電流センサ Download PDFInfo
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- WO2014141680A1 WO2014141680A1 PCT/JP2014/001346 JP2014001346W WO2014141680A1 WO 2014141680 A1 WO2014141680 A1 WO 2014141680A1 JP 2014001346 W JP2014001346 W JP 2014001346W WO 2014141680 A1 WO2014141680 A1 WO 2014141680A1
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- plate
- core
- bent
- end portion
- current sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
Definitions
- the present disclosure relates to a current sensor configured to detect the magnitude of the current based on the magnitude of the magnetic flux generated in the core.
- Patent Document 1 has proposed a core for a current sensor formed by bending a magnetic plate. Specifically, in Patent Document 1, there is a core configuration including a core body made of a bent plate material and a gap portion in which both ends of the bent plate material are arranged to face each other with a predetermined gap therebetween. Proposed.
- the core body has an inclined portion that is inclined so that the dimension in the minor axis direction of the plate material, that is, the width size of the plate material, is reduced from the side opposite to the gap to the connection portion between the gap portion and the core body. ing.
- plate material in a gap part is constant.
- the core body is provided with the inclined portion that reduces the width of the plate material, while the gap portion is not provided with the inclined portion. Magnetic field concentrates on the part. For this reason, the magnetic resistance at the connection portion between the core body and the gap portion becomes non-uniform, and a desired current detection characteristic cannot be obtained in the current sensor.
- the present disclosure aims to provide a current sensor including a core having uniform magnetoresistance characteristics.
- the current sensor has a connection portion in which a part of the plate material is bent, and one end portion and the other end portion of the plate material are opposed to each other with a certain magnetic gap on the opposite side to the connection portion. Equipped core.
- the current sensor is configured to detect the magnitude of the current based on the magnitude of the magnetic flux generated in the core when the current to be measured flows through the hollow portion of the core.
- the core includes a first taper portion in which the width of the plate material continuously narrows from the end portion on one end side of the connecting portion to the tip end of the one end portion, and the end portion on the other end side of the connecting portion. To the tip of the other end portion, the second taper portion where the width of the plate material is continuously narrowed.
- first tapered portion and the second tapered portion are provided in the core, there is no portion where the magnetic field concentrates due to the shape of the core from the connecting portion to each tip. Therefore, uniform magnetoresistance characteristics can be obtained in the core.
- FIG. (A) is the top view which looked at each taper part side among cores
- (b) is the side view of a core
- (c) is the front view which looked at the magnetic gap side of the core.
- FIG. 10 is a development view of the core shown in FIG. 9. It is a perspective view of the core which concerns on 3rd Embodiment.
- 11A is a plan view of the core of FIG. 11 as viewed from the side of each tapered portion
- FIG. 11B is a side view of the core of FIG. 11 as viewed from the first plate portion side
- (d) is a front view of the core of FIG. 11 viewed from the magnetic gap side. It is a top view for demonstrating other embodiment.
- the current sensor 10 includes a case 20, a core 30, a circuit unit 40, and a filler 50.
- the case 20 is an appearance of the current sensor 10 and is formed by molding a resin material.
- the case 20 is a quadrangular prism.
- Such a case 20 has a through hole 21, a housing portion 22, and a connector portion 23.
- the through hole 21 is provided so as to penetrate the one surface 24 of the case 20 and the other surface 25 opposite to the one surface 24. A current to be measured flows so as to penetrate through the through hole 21 via a wiring or the like.
- the accommodating portion 22 is a space portion formed by a portion of the one surface 24 of the case 20 being recessed toward the other surface 25 in a portion of the case 20 excluding the portion constituting the through hole 21. . That is, the accommodating portion 22 is provided around the through hole 21.
- the housing portion 22 houses the core 30 and the circuit portion 40.
- the connector part 23 is a connection part for electrically connecting the circuit part 40 and the outside.
- the connector part 23 is provided so as to protrude from the other surface 25 of the case 20 and is connected to a connector of a cable connected to a current detection device (not shown).
- the core 30 is a component that generates a magnetic flux in the core 30 when a current to be measured flows through the hollow portion of the core 30.
- the core 30 is composed of a single plate material 31, and one end portion 32 and the other end portion 33 of the plate material 31 are arranged to face each other with a certain magnetic gap 34 therebetween.
- a magnetic material such as permalloy is used.
- the through hole 21 of the case 20 is positioned in the hollow portion of the core 30. Further, the current to be measured passes through the through hole 21. Therefore, the current to be measured passes through the hollow portion of the core 30.
- the circuit unit 40 is mounted with a hall IC (not shown) for detecting the magnitude of the magnetic flux generated in the core 30 and a circuit chip (not shown) for processing a signal from the hall IC.
- the Hall IC is disposed in the magnetic gap 34 of the core 30.
- the filler 50 is a sealing member filled in the housing portion 22 in a state where the core 30 and the circuit portion 40 are housed in the housing portion 22 of the case 20.
- a material such as urethane is used.
- the surface of the filler 50 filled in the accommodating portion 22 becomes a part of the one surface 24 of the case 20.
- the core 30 includes a bent portion 35 in which a part of the plate material 31 is bent, and a first plate portion 36 and a second plate that are part of the plate material 31 and are connected to the bent portion 35. Part 37. That is, when the core 30 is expanded, the plate 31 is configured such that the bent portion 35 is sandwiched between the first plate portion 36 and the second plate portion 37.
- the one end portion 32 of the plate material 31 corresponds to the end portion on the opposite side of the bent portion 35 in the first plate portion 36. Further, the other end portion 33 of the plate material 31 corresponds to an end portion of the second plate portion 37 opposite to the bent portion 35.
- the bending portion 35 is bent with a constant diameter so as to be a semi-cylindrical shape.
- the “semicircle” is a perfect circle divided into two. Therefore, the “semi-cylindrical shape” indicates a state in which the cylinder is divided into two along the central axis so as to pass through the central axis of the cylinder. As a result, the path of the magnetic flux generated in the bent portion 35 becomes an arc shape having a constant diameter, so that the magnetic resistance in the bent portion 35 can be reduced.
- the core 30 has a first taper portion 36 a on the first plate portion 36 and a second taper portion 37 a on the second plate portion 37.
- the first taper portion 36 a extends from the end portion 35 a on the one end portion 32 side of the bent portion 35 to the tip end 32 a of the one end portion 32.
- variety of the 1st board part 36 is formed so that it may become narrow continuously.
- the end portion 35a on the one end portion 32 side of the bent portion 35 refers to one end portion in the circumferential direction of the semi-cylindrical bent portion 35.
- An end portion 35a of the bent portion 35 indicates a portion of the bent portion 35 connected to the first plate portion 36, and corresponds to the starting point of the first tapered portion 36a.
- the end point of the first taper portion 36 a corresponds to the tip 32 a of the one end portion 32 of the first plate portion 36.
- the width of the second plate portion 37 of the plate 31 is continuous from the end portion 35b on the other end portion 33 side of the bent portion 35 to the tip end 33a of the other end portion 33.
- the end 35 b of the bent portion 35 on the other end 33 side refers to the other end in the circumferential direction of the semi-cylindrical bent portion 35. That is, the end 35b of the bent portion 35 corresponds to the start point of the second taper portion 37a, and the tip 33a of the other end portion 33 of the second plate portion 37 corresponds to the end point of the second taper portion 37a.
- the “width of the first plate portion 36” is not the thickness of the plate material 31 constituting the first plate portion 36 but the width dimension of the first plate portion 36 in the minor axis direction.
- the “width of the second plate portion 37” is the width dimension of the second plate portion 37 in the minor axis direction.
- the side of the bent portion 35 opposite to the side corresponding to the first tapered portion 36a and the second tapered portion 37a, the side of the first plate portion 36 opposite to the first tapered portion 36a, and The side surface of the second plate portion 37 opposite to the second taper portion 37a is located on the same plane.
- the first plate so that one end 32 of the first plate portion 36 forms a magnetic gap 34 with the other end 33 of the second plate portion 37.
- the middle part of the part 36 is bent.
- the opposing distance between the inner wall surface at the end portion 35a on the one end portion 32 side of the bent portion 35 of the core 30 and the inner wall surface at the end portion 35b on the other end portion 33 side of the bent portion 35 is the magnetic gap. It is longer than 34. That is, when the opposing distance of the portion connected to the bent portion 35 side of each plate portion 36, 37, that is, the inner diameter (diameter) of the bent portion 35 is defined as L1, and the magnetic gap 34 is defined as L2, the condition of L1> L2 is satisfied.
- the core 30 is configured to satisfy. In the core 30 that satisfies such a condition, the diameter of the bent portion 35 is increased, so that the magnetic resistance can be reduced.
- first plate portion 36 is connected to the end portion 35 a on the one end portion 32 side of the bending portion 35 along the tangential direction of the end portion 35 a on the one end portion 32 side of the bending portion 35.
- second plate portion 37 is connected to the end portion 35b on the other end 33 side of the bent portion 35 along the tangential direction of the end portion 35b on the other end portion 33 side of the bent portion 35. ing. Thereby, the magnetic flux supplemented by the bending part 35 can be efficiently guided to the first plate part 36 and the second plate part 37.
- the core 30 having the above-described configuration is formed by forming a first taper portion 36a and a second taper portion 37a by pressing one plate material 31, and bending the plate material 31. Since the core 30 can be configured by simply cutting out a part of the plate material 31 in order to provide the respective tapered portions 36a and 37a, the magnetic material can be used efficiently, and the magnetic material can be used without waste. Moreover, since it can be comprised with the board
- the core 30 is provided with gently tapered portions 36a and 37a, the cross-sectional area ratio between the magnetic path and the magnetic gap 34 is large. For this reason, a hysteresis (residual magnetic flux) can be reduced and generation
- the circuit unit 40 processes a signal corresponding to the magnitude of the magnetic flux detected by the Hall IC.
- the magnitude of the current is detected.
- a signal corresponding to the magnitude of the current detected by the current sensor 10 is output to the outside via the connector unit 23.
- the conventional core is one in which a plurality of thin plate-like core pieces are laminated and integrated.
- Such a laminated core is configured by pressing so that a laminate of a plurality of thin plate-like magnetic bodies is formed into a ring shape.
- the laminated core has many unnecessary portions.
- the core 30 may be formed by bending a single plate material 31 instead of laminating a plurality of core pieces.
- the magnetic circuit design to increase the cross-sectional area of the magnetic path, in order to concentrate the magnetic flux density in the magnetic gap 34, it is necessary to reduce the cross-sectional area of the portion constituting the magnetic gap 34 in the core 30. is there. Therefore, the inventors have devised a core 30 having a shape in which the widths of the first plate portion 36 and the second plate portion 37 are continuously narrowed from the bent portion 35, as shown in FIG.
- the width of the first plate portion 36 and the second plate portion 37 of the core 30 is continuously narrowed, that is, the portion constituting the magnetic gap 34 in the first plate portion 36 and the second plate portion 37.
- the effect of not having a constant width will be described.
- the inventors have obtained the distribution of the magnetic flux density of the core 70 as a comparative example in which the width of the portion constituting the magnetic gap 34 is constant, and the magnetic flux density of the core 30 according to the present embodiment shown in FIG. We examined the distribution.
- the result of the comparative example is shown in FIG. 5, and the result of this embodiment is shown in FIG.
- each of the third plate portion 71 and the fourth plate portion 72 of the core 70 is divided into a portion where the width is continuously narrowed and a portion where the width is constant, It can be seen that the magnetic flux density is concentrated in the constricted portions 71a and 72a, which are the connecting portions. This is because the magnetic resistance varies unevenly in the constricted portions 71a and 72a. That is, the shape of the constricted portions 71a and 72a is not a gradual change but is a corner portion, which causes the magnetic resistance to change abruptly.
- a magnetic gap 73 is formed by a portion of the third plate portion 71 and the fourth plate portion 72 that has a constant width.
- the widths of the first plate portion 36 and the second plate portion 37 of the core 30 according to this embodiment are continuously narrow regardless of the magnetic gap 34 portion.
- the first plate portion 36 and the second plate portion 37 there is no portion where the magnetic flux density is concentrated. That is, in this embodiment, since the pole changing part for concentrating the magnetic flux density is not provided in the first plate part 36 and the second plate part 37 of the core 30, the first plate part 36 and the second plate part 37 are magnetic. The resistance can be changed uniformly.
- the changing part corresponds to a portion where the third plate part 71 and the fourth plate part 72 are bent at a right angle in addition to the constricted parts 71a and 72a. It can be said that the pole changing portion is a portion where the magnetic resistance changes rapidly.
- the intermediate portion of the first plate portion 36 is bent in order to adjust the width of the magnetic gap 34, but this bent shape is not a right angle but an R shape having a curved plate surface. ing. For this reason, the magnetic resistance does not change unevenly in the intermediate portion of the first plate portion 36. Therefore, concentration of magnetic flux density can be avoided.
- the core 30 can suppress a sudden increase in magnetic resistance and can constitute a magnetic circuit that efficiently guides the magnetic flux to the magnetic gap 34.
- Linearity is the rate of change of the gradient of magnetic flux density corresponding to the current value. For example, if the linearity is 0%, it indicates that there is no change in the gradient of the magnetic flux density with respect to the current value. That is, the current value and the magnetic flux density are proportional. On the other hand, when the linearity is a negative value, it indicates that the gradient of the magnetic flux density with respect to the current value is small. In this case, the magnetic flux density tends to saturate even if the current value increases.
- the linearity decreases as the current value of the current to be measured increases. This is considered that the linearity deteriorated due to the sudden magnetic saturation caused by the constricted portions 71a and 72a of the core 70.
- the linearity is only slightly lowered. That is, since the core 30 according to the present embodiment does not have the constricted portions 71a and 72a as the pole changing portions, rapid magnetic saturation does not occur as the current value increases. Therefore, the core 30 according to the present embodiment can suppress a decrease in linearity with respect to the current to be measured.
- the inventors examined the S / N ratio of the current to be measured with respect to the length of the magnetic gaps 34 and 73 in each of the cores 30 and 70.
- the length of the magnetic gap 73 is the length from the tip of the portion where the width of the third plate portion 71 and the fourth plate portion 72 is constant to the bent portion side.
- the length of the magnetic gap 34 corresponds to the length of the first plate portion 36 and the second plate portion 37 from the tips 32a and 33a to the bent portion 35 side.
- the S / N ratio of the core 30 according to the present embodiment is generally higher than the S / N ratio of the core 70 of the comparative example shown in FIG. This is because the core 30 according to this embodiment does not have the constricted portions 71a and 72a as the changing portions, and the core 70 shown in FIG. 5 has the constricted portions 71a and 72a as the changing portions. Because. That is, the core 30 according to the present embodiment increases the area of the plate material 31 by the constricted portions 71a and 72b as compared with the core 70 shown in FIG. Can be increased.
- the core 30 is provided with the first tapered portion 36a and the second tapered portion 37a.
- tip 32a, 33a resulting from the shape of the core 30 can be eliminated.
- the intermediate portion of the first plate portion 36 is bent, but the second plate portion 37 is not bent.
- an intermediate portion between the bent portion 35 and the first plate portion 36 can be formed with the second plate portion 37 as a reference. That is, since the second plate portion 37 serves as a processing reference, the processing accuracy of the bent portion 35 and the intermediate portion of the first plate portion 36 can be improved. For this reason, it is possible to prevent the magnetic gap 34 from exceeding a dimensional tolerance by processing.
- the intermediate portion of the first plate portion 36 is bent, a space can be secured on the one end portion 32 side of the first plate portion 36. Therefore, the space efficiency of the accommodating part 22 of the case 20 can be improved.
- corresponds to a connection part.
- the width of the bent portion 35 is larger than the width of the portion of the first plate portion 36 connected to the bent portion 35. Therefore, a portion of the bent portion 35 that is cut by the virtual first tapered portion 36a in the bent portion 35 when the first tapered portion 36a is extended into the bent portion 35 becomes the first corner portion 35c.
- the corner portion on the first taper portion 36a side of the first plate portion 36 is the first corner portion 35c.
- the second corner 35d is a virtual second taper 37a in the bent portion 35 when the second tapered portion 37a of the bent portion 35 is extended into the bent portion 35.
- the portion cut out by the above becomes the second corner 35d.
- the corner portion on the second taper portion 37a side of the second plate portion 37 is the second corner portion 35d.
- the first tapered portion 36 a is the first of the plate materials 31 from the end portion 35 a of the bent portion 35 to the tip end 32 a of the one end portion 32.
- the width of the plate portion 36 is formed to be continuously narrowed.
- the second tapered portion 37a extends from the end portion 35b of the bent portion 35 to the tip end 33a of the other end portion 33.
- the second plate portion 37 is formed so that the width thereof is continuously narrowed. Further, the corner portions 35 c and 35 d do not affect the magnetic characteristics of the core 30.
- the core 80 according to the present embodiment is connected to the connecting portion 82 that is a part of the plate material 81 and a connecting portion 82 in which a part of one plate material 81 is bent, and is connected to the connecting portion 35.
- the fifth plate portion 83 and the sixth plate portion 84 are configured. That is, when the core 80 is expanded, the plate member 81 is configured such that the connecting portion 82 is sandwiched between the fifth plate portion 83 and the sixth plate portion 84.
- the one end portion 85 of the plate member 81 corresponds to the end portion of the fifth plate portion 83 opposite to the connecting portion 82.
- the other end 86 of the plate 81 corresponds to the end of the sixth plate 84 that is opposite to the connecting portion 82.
- one end portion 85 and the other end portion 86 of the plate material 81 are disposed to face each other with a certain magnetic gap 87 interposed therebetween.
- the connecting portion 82 includes a bent portion 88, a first connecting portion 89, and a second connecting portion 90.
- the width of the connecting portion 82 is constant.
- the bent portion 88 is bent with a constant diameter so as to be a semi-cylindrical shape, similar to the bent portion 35 described above.
- the first connecting portion 89 is a plate-like portion that connects the bent portion 88 and the fifth plate portion 83.
- One end portion 89 a of the first connection portion 89 is connected to one end portion 88 a of the bending portion 88, and the other end portion 89 b of the first connection portion 89 is connected to the fifth plate portion 83. Is connected to one end 83a.
- the first connection portion 89 is connected to the end portion 88 a on the one end portion 85 side of the bending portion 88 along the tangential direction of the end portion 88 a on the one end portion 85 side of the bending portion 88. Thereby, the magnetic flux supplemented by the bending part 88 can be efficiently guided to the first connection part 89.
- first connection portion 89 has a first corner portion 89c provided on the other end portion 89b side.
- the first corner portion 89 c is a portion provided by the width of the other end portion 89 b side of the first connection portion 89 being larger than the maximum width of one end portion 83 a of the fifth plate portion 83. is there.
- the second connection portion 90 is a plate-like portion that connects the bent portion 88 and the sixth plate portion 84.
- One end 90 a of the second connection part 90 is connected to the other end 88 b of the bent part 88, and the other end 90 b of the second connection part 90 is of the sixth plate part 84. Is connected to one end portion 84a.
- the 2nd connection part 90 is connected to the edge part 88b by the side of the other end part 86 side of the bending part 88 along the tangential direction of the edge part 88b by the side of the other end part 86 of the bending part 88. Yes.
- the magnetic flux supplemented by the bending part 88 can be efficiently guided to the second connection part 90.
- the 2nd connection part 90 has the 2nd corner
- the second corner portion 90 c has a width on the other end portion 90 b side of the second connection portion 90 that is greater than the maximum width of one end portion 84 a of the sixth plate portion 84. Is a part provided by being large.
- the first corner portion 89c and the second corner portion 90c serve to suppress burrs when the plate material 81 is pressed.
- the fifth plate portion 83 has a third tapered portion 83b.
- the third taper portion 83 b is a portion formed so that the width of the fifth plate portion 83 is continuously narrowed from one end portion 83 a of the fifth plate portion 83 to the tip end 85 a of the one end portion 85. It is. Even if the first connecting portion 89 is provided with the first corner portion 89c, the third tapered portion 83b extends from the end portion 89b of the first corner portion 89c to the tip end 85a of the one end portion 85. The width is continuously narrowed.
- the sixth plate portion 84 has a fourth taper portion 84b.
- the fourth taper portion 84b is formed so that the width of the sixth plate portion 84 is continuously narrowed from one end portion 84a of the sixth plate portion 84 to the tip end 86a of the other end portion 86. Part. Even if the second connecting portion 90 is provided with the second corner portion 90c, the fourth tapered portion 84b extends from the end portion 90b of the second corner portion 90c to the tip end 86a of the other end portion 86. The width 84 is continuously narrowed.
- the other of the second connection portions 90 is formed such that one end portion 85 of the fifth plate portion 83 forms a magnetic gap 87 with the other end portion 86 of the sixth plate portion 84.
- One end portion 83a of the end portion 90b and the fifth plate portion 83 is bent.
- the hollow portion of the core 80 is L-shaped.
- the space efficiency of the core 80 can be improved.
- the space efficiency can be further improved by bending the intermediate portion of the fifth plate portion 83.
- the second connecting portion 90 and the second connecting portion 90 and the inner gap (diameter) of the bent portion 88 are longer than the magnetic gap 87 by facing each other at the end portions 88 a and 88 b of the bent portion 88 of the core 80.
- the fifth plate portion 83 is bent.
- the second connection portion 90 and the fifth plate portion 83 are bent so as to have a shape that is not a pole changing portion, that is, an R shape. Thereby, the magnetic resistance of the core 80 can be reduced.
- the side surface and the side surface of the sixth plate portion 84 opposite to the fourth taper portion 84b are located on the same plane.
- the width of the core 80 is wide as shown in FIG. 12 (d)
- a thick bus bar or the like can be measured.
- the sixth plate portion 84 as a processing reference, the processing accuracy of the bent portion of the core 80 can be improved.
- correspond to a connection part.
- the third taper portion 83b corresponds to the first taper portion
- the fourth taper portion 84b corresponds to the second taper portion.
- the configuration of the current sensor 10 shown in each of the above embodiments is an example, and the present disclosure is not limited to the configuration shown above, and other configurations that can realize the present disclosure can be used.
- the bending portion 35 of the core 30 is an example of a semi-cylindrical shape, and may be bent, for example, in an arc shape within a range that does not affect the magnetoresistance characteristics of the core 30.
- the cores 30 and 80 are configured by the single plate material 31 or 81, but may be configured by a plurality of the plate materials 31 and 81.
- the cores 30 and 80 may be formed by laminating and bending two pressed plate materials 31 and 81.
- a path of magnetic flux can be positively created by the skin effect of the plate materials 31 and 81.
- the current to be measured is an alternating current
- the skin effect is enhanced, so there is an advantage in that the cores 30 and 80 are constituted by a plurality of plate materials 31 and 81.
- the first connecting portion 89 is provided with the first corner portion 89c
- the second connecting portion 90 is provided with the second corner portion 90c.
- the first corner 89c and the second corner 90c may not be provided in the core 80.
- the width on the other end 89 b side of the first connection portion 89 and the maximum width of one end 83 a of the fifth plate portion 83 are the same.
- the width on the other end 90 b side of the second connection portion 90 is the same as the maximum width of one end 84 a of the sixth plate portion 84.
- two Hall ICs 100 may be arranged side by side in the magnetic gap 34 of the core 30.
- the part which comprises the magnetic gap 34 among the cores 30, ie, the part which comprises the magnetic gap 34 among the 1st board part 36 and the 2nd board part 37, is opposingly arranged so that it may become parallel.
- the current to be measured can be measured in two ranges.
- portions of the fifth plate portion 83 and the sixth plate portion 84 that constitute the magnetic gap 87 are parallel. It suffices if they are arranged so as to face each other.
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Abstract
Description
第1実施形態について図を参照して説明する。図1及び図2に示されるように、電流センサ10は、ケース20と、コア30と、回路部40と、充填材50と、を備えて構成されている。
本実施形態では、第1実施形態と異なる部分について説明する。図9の側面図及び図10の展開図に示されるように、板材31としてH幅のロール材を使用した場合、プレス加工時のバリ抑制のために、コア30が第1角部35c及び第2角部35dを有する構成であっても良い。なお、図9及び図10では各角部35c、35dを斜線ハッチングで示している。
本実施形態では、第1、第2実施形態と異なる部分について説明する。図11に示されるように、本実施形態に係るコア80は、1枚の板材81の一部が複数曲げられた連結部82と、板材81の一部であると共に連結部35に接続された第5板部83及び第6板部84と、で構成されている。つまり、コア80を展開すると、板材81は第5板部83と第6板部84とで連結部82を挟んだものとして構成されている。
上記各実施形態で示された電流センサ10構成は一例であり、上記で示した構成に限定されることなく、本開示を実現できる他の構成とすることもできる。例えば、コア30の曲げ部35が半円筒状であることは形状の一例であり、コア30の磁気抵抗特性に影響を及ぼさない範囲で例えば円弧状に曲げられていても良い。
Claims (7)
- 板材(31、81)の一部が曲げられた連結部(35、82)を有すると共に、前記連結部(35、82)とは反対側において前記板材(31、81)の一端部(32、85)と他端部(33、86)とが一定の磁気ギャップ(34、87)を介して対向配置されたコア(30、80)を備え、
前記コア(30、80)の中空部分を貫通するように測定対象の電流が流れることによって前記コア(30、80)に発生する磁束の大きさに基づいて当該電流の大きさを検出するように構成された電流センサであって、
前記コア(30、80)は、
前記連結部(35、82)のうちの前記一端部(32、85)側の端部(35a、89b)から前記一端部(32、85)の先端(32a、85a)に至るまで、前記板材(31、81)の幅が連続して狭くなる第1テーパ部(36a、83b)と、
前記連結部(35、82)のうちの前記他端部(33、86)側の端部(35b、90b)から前記他端部(33、86)の先端(33a、86a)に至るまで、前記板材(31、81)の幅が連続して狭くなる第2テーパ部(37a、84b)と、
を有している電流センサ。 - 前記連結部は、半円筒状となるように一定の径で曲げられた曲げ部(35)として構成されている請求項1に記載の電流センサ。
- 前記板材(31)において、前記曲げ部(35)のうちの前記一端部(32)側の端部(35a)から前記一端部(32)の先端(32a)までを第1板部(36)とすると共に、前記曲げ部(35)のうちの前記他端部(33)側の端部(35b)から前記他端部(33)の先端(33a)までを第2板部(37)とすると、
前記第1板部(36)は、前記曲げ部(35)のうちの前記一端部(32)側の端部(35a)の接線方向に沿って、当該一端部(32)側の端部(35a)に接続されており、
前記第2板部(37)は、前記曲げ部(35)のうちの前記他端部(33)側の端部(35b)の接線方向に沿って、当該他端部(33)側の端部(35b)に接続されている請求項2に記載の電流センサ。 - 前記曲げ部(35)のうちの前記一端部(32)側の端部(35a)における内壁面と前記曲げ部(35)のうちの前記他端部(33)側の端部(35b)における内壁面との対向距離が、前記磁気ギャップ(34)よりも長い請求項2または3に記載の電流センサ。
- 前記連結部は、
半円筒状となるように一定の径で曲げられた曲げ部(88)と、
前記曲げ部(88)のうちの前記一端部(85)側の端部(88a)に接続された第1接続部(89)と、
前記曲げ部(88)のうちの前記他端部(86)側の端部(88b)に接続された第2接続部(90)と、
を有して構成されている請求項1に記載の電流センサ。 - 前記第1接続部(89)は、前記曲げ部(88)のうちの前記一端部(85)側の端部(88a)の接線方向に沿って、当該一端部(85)側の端部(88a)に接続されており、
前記第2接続部(90)は、前記曲げ部(88)のうちの前記他端部(86)側の端部(88b)の接線方向に沿って、当該他端部(86)側の端部(88b)に接続されている請求項5に記載の電流センサ。 - 前記曲げ部(88)のうちの前記一端部(85)側の端部(88a)における内壁面と前記曲げ部(88)のうちの前記他端部(86)側の端部(88b)における内壁面との対向距離が、前記磁気ギャップ(87)よりも長い請求項5または6に記載の電流センサ。
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JP6685598B2 (ja) * | 2016-04-21 | 2020-04-22 | メトロ車両株式会社 | 電流センサー |
JP2018004269A (ja) * | 2016-06-27 | 2018-01-11 | アイシン精機株式会社 | 電流センサ |
JP6988684B2 (ja) * | 2018-05-18 | 2022-01-05 | 株式会社デンソー | 電流センサ |
DE102021111412A1 (de) | 2021-05-03 | 2022-11-03 | Phoenix Contact Gmbh & Co. Kg | Strommesssystem zur Messung eines durch einen elektrischen Stromleiter fließenden Stroms sowie ein entsprechendes Verfahren |
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