JP5333037B2 - Rogowski coil - Google Patents

Description

  The present invention relates to a Rogowski coil.

  Rogowski coils are used in many situations to measure the current flowing through the wiring in a non-contact manner. The Rogowski coil includes a toroidal coil and a rewinding conductor extending in the core of the toroidal coil. When current measurement is performed using a Rogowski coil, the wiring to be measured is arranged so as to pass through a closed space closed by a toroidal coil. The Rogowski coil can measure the current flowing through the wiring in a non-contact manner by detecting a magnetic field change caused by the current flowing through the wiring.

  Patent Document 1 discloses an example of a conventional Rogowski coil. The Rogowski coil of Patent Document 1 includes a toroidal coil composed of a core (or also called a bobbin) and a linear winding conductor, and a rewinding conductor extending in the core along the toroidal direction. . The winding conductor is spirally wound around the core surface along the toroidal direction.

Japanese Patent Laid-Open No. 3-91214

  In the Rogowski coil of Patent Document 1, a linear winding conductor is used. For this reason, for example, if irregularities exist on the core surface, the irregularities are reflected in the form of the wound conducting wire, and the cross-sectional area for each turn of the wound conducting wire changes. For example, the cross-sectional area of one turn of the wound conductive wire is reduced in the concave portion, and the cross-sectional area of one turn of the wound conductive wire is increased in the convex portion. In particular, when trying to reduce the size of the Rogowski coil, the number of windings of the winding conductor decreases, so that the variation in the cross-sectional area for each turn becomes obvious. For this reason, for example, the Rogowski coil is easily affected by a magnetic field change (influence of disturbance) caused by a current flowing through a wiring disposed around the Rogowski coil, and the measurement accuracy is deteriorated.

  The technology disclosed in the present specification aims to provide a Rogowski coil that is not easily affected by disturbance.

  The technique disclosed in the present specification is characterized in that the toroidal coil of the Rogowski coil is formed by using a plate-shaped winding conductive plate. Even if irregularities are formed on the surface of the winding guide plate by using a plate-like winding guide plate, the influence of the unevenness in the cross-sectional area of one turn is leveled, and the cross-sectional area variation for each turn Is suppressed. Moreover, by using a plate-shaped winding guide plate, it becomes difficult to be affected by disturbance due to the shielding effect. As described above, when the toroidal coil is formed using the plate-shaped winding guide plate, a Rogowski coil that is hardly affected by disturbance is realized.

  The Rogowski coil disclosed in this specification includes a toroidal coil and a rewinding conductor extending in the core of the toroidal coil. The toroidal coil has a plate-shaped winding guide plate that is spirally wound along the toroidal direction. The winding guide plate is characterized in that the width in the toroidal direction is wide on the outer peripheral surface side and narrow on the inner peripheral surface side. When the winding guide plate has the above-described form, a toroidal coil in which the plate-like winding guide plate is spirally wound is formed.

  It is preferable that the gap width between the winding guide plates adjacent along the toroidal direction is narrower than the width of the winding guide plate in the toroidal direction. In this Rogowski coil, when the toroidal coil is observed along the toroidal direction, the area occupied by the winding guide plate is larger than the gap between adjacent winding guide plates. That is, the area of the winding guide plate that occupies the entire shape of the toroidal coil increases. A Rogowski coil having a toroidal coil of this form has high measurement sensitivity.

  It is preferable that the gap width between the winding guide plates adjacent along the toroidal direction is constant over the entire circumference of the toroidal coil. In this Rogowski coil, the shape of the toroidal coil is common throughout the circumference. A Rogowski coil having this form of toroidal coil is less susceptible to disturbances.

  The winding guide plate is preferably formed of a curved surface in both the toroidal direction and the poloidal direction. The toroidal coil of this form has a torus type (or donut type) form. The toroidal coil having this configuration is highly sensitive and hardly affected by disturbance.

  According to the technique disclosed in the present specification, a Rogowski coil that is not easily affected by a disturbance can be provided by forming a toroidal coil using a plate-shaped winding guide plate.

The conceptual diagram of the Rogowski coil of 1st Example is shown. The perspective view of the Rogowski coil of 1st Example is shown. The perspective view which showed the internal structure of the Rogowski coil of 1st Example with the broken line is shown. The cut figure which cut | disconnected a part of Rogowski coil of 1st Example is shown. Sectional drawing of a winding guide plate and a rewind guide plate is shown. The perspective view of the Rogowski coil of the modification of 1st Example is shown. An example of a method for installing the Rogowski coil of the first embodiment will be shown. Another example of the method of installing the Rogowski coil of the first embodiment will be shown. Another example of the method of installing the Rogowski coil of the first embodiment will be shown. The method to manufacture the Rogowski coil of 1st Example is shown. The conceptual diagram of the Rogowski coil of 2nd Example is shown. The perspective view of the Rogowski coil of 2nd Example is shown. The perspective view which showed the internal structure of the Rogowski coil of 2nd Example with the broken line is shown. An example of a method for installing the Rogowski coil of the second embodiment will be shown.

First, the techniques disclosed in this specification will be organized.
(Toroidal coil)
The planar shape of the toroidal coil is preferably substantially circular. For example, the planar shape of the toroidal coil is preferably circular, elliptical, or polygonal. In addition, the planar shape of the toroidal coil is not necessarily required to go around, and for example, as in a second embodiment described later, an opening / closing point may be provided in part. The cross-sectional shape of the toroidal coil is not particularly limited as long as it is substantially circular. For example, the cross-sectional shape of the toroidal coil is preferably circular, elliptical, or polygonal. The overall shape of the toroidal coil is configured by various combinations of the above-described planar shape and the above-mentioned cross-sectional shape. Preferably, the toroidal type (or the donut type) has a circular planar shape and a circular cross-sectional shape. It is desirable to say. Further, the toroidal coil may include a core (also referred to as a bobbin). In this case, the core is preferably made of a nonmagnetic material. The toroidal coil disclosed in this specification can be manufactured using a three-dimensional additive manufacturing method (rapid prototyping method). Therefore, the toroidal coil disclosed in the present specification can be manufactured without using a core. The toroidal coil disclosed herein is preferably in the form of an air core without a core.

(Wound lead plate)
The winding guide plate is preferably in the form of a plate containing a conductive material. The plate shape as used in this specification refers to a plate having a different cross-sectional height and width. The winding guide plate may be composed of only a conductive material, or a nonmagnetic main body surface such as a resin may be coated with a conductive material. The winding guide plate has a form wound spirally along the toroidal direction, and preferably has a width in the toroidal direction that is narrower on the inner peripheral surface side than on the outer peripheral surface side. The winding guide plate preferably has a maximum width in the toroidal direction on the outer peripheral surface side and a minimum value in the toroidal direction on the inner peripheral surface side. Moreover, as for a winding guide plate, it is desirable for any width by the side of the outer peripheral surface in a toroidal direction to be wider than any width by the side of an inner peripheral surface. A gap is provided between the winding guide plates adjacent to each other along the toroidal direction. This gap preferably appears spirally in the toroidal coil along the toroidal direction.

(Rewinding conductor)
The rewinding conductor is preferably in the form of a wire or a plate containing a conductive material. The rewinding lead may be composed of only a conductive material, or a nonmagnetic main body surface such as a resin may be coated with a conductive material.

  The Rogowski coil 10 of 1st Example is demonstrated with reference to FIGS. In FIG. 1, the conceptual diagram of the Rogowski coil 10 of 1st Example is shown. FIG. 2 is a perspective view of the Rogowski coil 10 of the first embodiment. In FIG. 3, the perspective view which showed the internal structure of the Rogowski coil 10 of 1st Example with the broken line is shown. FIG. 4 shows a cut view of a part of the Rogowski coil 10.

  As shown in FIG. 1, the Rogowski coil 10 is provided at a toroidal coil 20, a rewinding conductor 30 extending along the toroidal direction in the core of the toroidal coil 20, and an end of the toroidal coil 20. A first terminal 40 and a second terminal 50 provided at the end of the rewinding conductor.

  As shown in FIG. 2, the overall shape of the toroidal coil 20 is a torus type (or a donut type). The toroidal coil 20 has a plate-shaped winding guide plate 22 that is spirally wound along the toroidal direction (see the upper left in FIG. 2). The winding guide plate 22 is spirally wound clockwise along the toroidal direction from the winding start point 24 and returns to the winding start point 24 once in the toroidal direction. The start end portion 22a and the end portion 22b of the winding guide plate 22 face each other in the poloidal direction (see the upper left in FIG. 2), and a gap (also referred to as a cut end) between the start end portion 22a and the end end portion 22b extends along the toroidal direction. Is growing. According to this form, the turn constituted by the winding guide plate 22 goes around the toroidal coil 20 continuously. Instead of this example, as shown in FIG. 6, the start end portion 22 a and the end end portion 22 b of the winding guide plate 22 may have a sharp shape. The forms of the start end portion 22a and the end end portion 22b of the winding guide plate 22 can be appropriately determined according to the application.

  The width of the winding guide plate 22 in the toroidal direction is such that the outer peripheral surface side width 22Wa is wider than the inner peripheral surface side width 22Wb. Thereby, the toroidal coil 20 wound spirally along the toroidal direction is formed. In this example, any width 22Wa of the winding guide plate 22 on the outer peripheral surface side is wider than any width 22Wb of the winding guide plate 22 on the inner peripheral surface side. Further, when the toroidal coil 20 is viewed in plan, the width 22Wa at the outermost periphery constituting the outer periphery side contour is the maximum width, and the width 22Wb at the innermost periphery constituting the inner periphery side contour is the minimum width. Further, when the toroidal coil 20 is viewed from the front, the width of the uppermost surface constituting the upper contour matches the width of the lowermost surface constituting the lower contour. Furthermore, the width 22Wg between the winding guide plates 22 adjacent along the toroidal direction is configured to be narrower than the widths 22Wa and 22Wb of the winding guide plate 22 in the toroidal direction. According to this embodiment, when the toroidal coil 20 is observed along the toroidal direction, the area occupied by the winding guide plate 22 is larger than the gap between the adjacent winding guide plates 22, and the entire shape of the toroidal coil 20 is obtained. The area of the winding guide plate 22 occupying is increased. The width 22Wg between the winding guide plates 22 adjacent along the toroidal direction is constant over the entire circumference of the toroidal coil 20. According to this form, the form of the toroidal coil 20 is made uniform over the entire circumference. Furthermore, the winding guide plate 22 has a donut shape, and is formed of a curved surface in both the toroidal direction and the poloidal direction.

  As shown in FIGS. 3 and 4, the rewinding lead wire 30 includes a rewinding lead plate 32 extending in the core of the toroidal coil 20 along the toroidal direction. The unwinding guide plate 32 extends from the unwinding starting point 24 in the toroidal direction counterclockwise around the core of the toroidal coil 20 and returns to the unwinding starting point 24. The starting end portion 32 a of the rewinding conducting wire is connected to the terminal end portion 22 b of the winding conducting plate 22. The first terminal 40 is provided at the start end portion 22 a of the winding guide plate 22, and the second terminal 50 is provided at the end portion 32 b of the rewind guide plate 32. The first terminal 40 and the second terminal 50 protrude from the outer peripheral surface of the toroidal coil 20 toward the side. The first terminal 40 and the second terminal 50 face each other along the poloidal direction.

  FIG. 5 shows a cross-sectional view of the winding guide plate 22 and the rewinding guide plate 32. As shown in FIG. 5, the winding guide plate 22 and the rewind guide plate 32 are made of resin body portions 26 and 36 made of resin, and conductor films 28 and 38 that cover the resin body portions 26 and 36. It has. As will be described later, the Rogowski coil 10 of this embodiment is manufactured by using an optical modeling technique and a plating technique. The resin main body portions 26 and 36 are formed using an optical modeling method, and the conductor coatings 28 and 38 are coated on the surfaces of the resin main body portions 26 and 36 using a plating technique.

The characteristics of the Rogowski coil of this embodiment are organized.
(1) In the Rogowski coil 10 of the present embodiment, the toroidal coil 20 is formed using a plate-shaped winding guide plate 22. Even if irregularities are formed on the surface of the winding guide plate 22 by using the plate-like winding guide plate 22, the influence of the projections and depressions on the cross-sectional area of one turn is leveled, and the break is broken for each turn. Variation in area is suppressed. Moreover, by using the plate-shaped winding guide plate 22, it becomes difficult to be affected by disturbance due to the shielding effect. As described above, when the toroidal coil 20 is formed using the plate-shaped winding guide plate 22, the Rogowski coil 10 which is hardly affected by disturbance can be formed. As a result, the Rogowski coil 10 of the present embodiment can have high measurement accuracy even when it is downsized. In particular, when another wiring is provided around the wiring to be measured, the Rogowski coil 10 of this embodiment flows through the wiring to be measured while suppressing the influence of disturbance caused by the other wiring. Current can be measured with high accuracy.
(2) In the Rogowski coil 10 of the present embodiment, the width 22Wg between the winding guide plates 22 adjacent along the toroidal direction is narrower than the widths 22Wa and 22Wb of the winding guide plate 22 in the toroidal direction. For this reason, the area of the winding guide plate 22 occupying the entire shape of the toroidal coil 20 increases. The Rogowski coil 10 having the toroidal coil 20 of this form has high measurement sensitivity.
(3) In the Rogowski coil 10 of the present embodiment, the width 22Wg between the winding guide plates 22 adjacent along the toroidal direction is constant over the entire circumference of the toroidal coil 20. According to this configuration, the configuration of the toroidal coil 20 is uniform over the entire circumference and is not easily affected by disturbance.
(4) In the Rogowski coil 10 shown in FIGS. 2 to 4, the gap between the start end portion 22 a and the end end portion 22 b of the winding guide plate 22 extends along the toroidal direction, and is configured by the winding guide plate 22. The turn to be made makes a round of the toroidal coil 20 continuously. For this reason, even if there is a wiring that is not to be measured in the vicinity of the first terminal 40 and the second terminal 50, it is difficult to be affected by disturbance caused by the wiring.

  Next, the example which installs the Rogowski coil 10 of 1st Example in the wiring of a measuring object is illustrated. FIG. 7 illustrates an example in which the Rogowski coil 10 is installed on the wiring 82b to be measured among the three wirings 82a, 82b, and 82c.

  As shown in FIG. 7A, the wiring 82b is passed using the gap between the start end portion 22a and the end end portion 22b of the winding guide plate 22. Next, as shown in FIG. 7B, the Rogowski coil 10 is rotated. Next, as shown in FIG. 7C, the wiring 82b is passed through the gap between the start end portion 32a and the end end portion 32b of the rewinding guide plate 32. Next, as shown in FIG. 7D, the wiring 82b is passed using the gap on the inner peripheral surface side of the winding guide plate 22 adjacent in the toroidal direction. Thereby, the wiring 82 b passes through the Rogowski coil 10 and is disposed in the closed space of the Rogowski coil 10. As described above, since the Rogowski coil 10 can be configured in a small size, even when the three wirings 82a, 82b, and 82c are arranged in a narrow range, one of the wirings 82b is arranged. Can be installed easily. Further, as described above, the Rogowski coil 10 can measure the current flowing through the wiring 82b with high accuracy while suppressing the influence of the disturbance caused by the surrounding wirings 82a and 82c.

  In addition, as shown in FIG. 8, when the wiring 84 is of a size that cannot pass through the gap between the winding guide plates 22, the wiring 84 is previously passed through the closed space of the Rogowski coil 10. Also good.

  Further, as shown in FIG. 9, the Rogowski coil 10 can be arranged on the wiring to be measured using a bolt-shaped jig 60. FIG. 9 shows an exploded cut view in which a part of the bolt-type jig 60 is cut. The bolt-shaped jig 60 protrudes from the center part of the head part 62 toward the upper part, a head part 62 of a regular hexagonal column, a shaft part 64 on which a male screw is formed, a cover part 66 surrounding the periphery of the shaft part 64. And an extraction wiring portion 68 connected to the shaft portion 64. The Rogowski coil 10 is provided in a space between the shaft part 64 and the cover part 66, and the shaft part 64 passes through the closed space of the Rogowski coil 10.

  The bolt-type jig 60 is used by being fixed to a hole provided on the surface of an external device (not shown). An internal thread is formed on the inner wall of the hole, and the bottle mold jig 60 is fixed to the external device by engaging with the shaft portion 64 of the bottle mold jig 60. The inner wall of the hole in which the female screw is formed functions as a current extraction terminal of the external device. For this reason, when the bolt-type jig 60 is fixed to the hole, the current can be taken out through the shaft portion 64 and the extraction wiring portion of the bolt-type jig 60. Furthermore, since the Rogowski coil 10 is disposed around the shaft portion 64 of the bolt-shaped jig 60, the current flowing through the shaft portion 64 can be measured.

(Rogowski coil manufacturing method)
With reference to FIG. 10, the manufacturing method of the Rogowski coil 10 is demonstrated. The Rogowski coil 10 is manufactured using an optical modeling apparatus (not shown). The optical modeling apparatus uses, for example, an acrylic resin as a photo-curing resin, and uses ultraviolet light as a laser beam. First, the three-dimensional shape data of the Rogowski coil 10 is input to the optical modeling apparatus. The optical modeling apparatus creates slice data from the three-dimensional shape data. The optical modeling apparatus scans the laser beam based on the slice data, repeats the resin curing and lamination steps as shown in FIGS. 10A to 10D, and the resin main body corresponding to the wound conductor 22 26 and a resin main body 36 (not shown) corresponding to the rewinding guide plate 32 are produced.

Next, using plating technology, for example, copper (Cu
Conductive coatings 28 and 38 are formed. Through these steps, the Rogowski coil 10 is manufactured. In addition, if the shaping | molding technique by the powder sintering method which can be directly modeled from a metal is used, a Rogowski coil can also be formed only with a metal.

  A Rogowski coil 100 according to the second embodiment will be described with reference to FIGS. In the following description, only differences from the Rogowski coil 10 of the first embodiment will be described, and description of common points will be omitted. Moreover, about the component which is substantially common, a common code | symbol is attached | subjected.

  In FIG. 11, the conceptual diagram of the Rogowski coil 100 of 2nd Example is shown. In FIG. 12, the perspective view of the Rogowski coil 100 of 2nd Example is shown. In FIG. 13, the perspective view which added the internal structure of the Rogowski coil 100 of 2nd Example with the broken line is shown.

  As shown in FIG. 11, the Rogowski coil 100 includes a toroidal coil 20, a rewinding wire 30 extending in the toroidal direction in the core of the toroidal coil 20, and one end of the toroidal coil 20. A first terminal 40 provided, a second terminal 50 provided at the other end of the toroidal coil 20, and a holding part 70 provided at an intermediate portion of the rewinding conductor 30 are provided.

  As shown in FIG. 13, in the Rogowski coil 100, the winding guide plate 22 is spirally wound clockwise along the toroidal direction from the winding start point 24, and a half-turned position (hereinafter, It is wound up to an open / close point 25). The first intermediate end portion 22 c of the winding guide plate 22 is connected to the start end portion 32 c of the internal rewind guide plate 32 at the opening / closing point 25. The unwinding guide plate 32 extends from the opening / closing point 25 in the toroidal direction in a counterclockwise direction along the toroidal direction, and returns to the opening / closing point 25. The end portion 32 d of the rewinding guide plate 32 is connected to the second intermediate end portion 22 d of the winding guide plate 22 at the opening / closing point 25. The first intermediate end 22c and the second intermediate end 22d of the winding guide plate 22 are separated from each other. The winding guide plate 22 is spirally wound clockwise from the opening / closing point 25 along the toroidal direction, and returns to the winding start point 24. The start end portion 22a and the end end portion 22b of the winding guide plate 22 face each other in the poloidal direction. The first terminal 40 is provided at the start end portion 22 a of the winding guide plate 22, and the second terminal 50 is provided at the end portion 22 b of the winding guide plate 22, both of which are on the side from the outer peripheral surface of the toroidal coil 20. It protrudes toward the direction. The first terminal 40 and the second terminal 50 face each other along the poloidal direction.

  The holding part 70 is provided in the center part of the rewinding guide plate 32, passes between the first terminal 40 and the second terminal 50, and protrudes laterally from the outer peripheral surface of the toroidal coil 20. The holding unit 70 is used when, for example, the Rogowski coil 100 is fixed to a holder. Moreover, the holding | maintenance part 70 can also be used as a support body at the time of optical modeling.

Next, an example in which the Rogowski coil 100 of the second embodiment is installed on the wiring to be measured will be illustrated with reference to FIG.
As shown in FIGS. 14A and 14B, the Rogowski coil 100 has an opening / closing point 25, and the Rogowski coil 100 can be separated at the opening / closing point 25. Next, as shown in FIG. 14C, the wiring 86 to be measured is placed in the closed space of the Rogowski coil 100 with the Rogowski coil 100 separated at the opening / closing point 25. Next, as shown in FIG. 14D, the open / close point 25 of the Rogowski coil 100 is closed. Thereby, the Rogowski coil 100 is installed in a state in which the current flowing through the wiring 86 is measured.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

10, 100: Rogowski coil 20: Toroidal coil 22: Winding conductor 30: Rewinding conductor 32: Rewinding conductor 40: First terminal 50: Second terminal

Claims (4)

A toroidal coil,
A rewinding conductor extending in the core of the toroidal coil, and
The toroidal coil has a plate-shaped winding guide plate that is spirally wound along the toroidal direction;
A Rogowski coil, characterized in that the width of the winding guide plate in the toroidal direction is wide on the outer peripheral surface side and narrow on the inner peripheral surface side.   The Rogowski coil according to claim 1, wherein a gap width between the winding guide plates adjacent along the toroidal direction is narrower than a width of the winding guide plate in the toroidal direction.   The Rogowski coil according to claim 1 or 2, wherein a gap width between winding guide plates adjacent along the toroidal direction is constant over the entire circumference of the toroidal coil.   The Rogowski coil according to any one of claims 1 to 3, wherein the winding guide plate is formed of a curved surface in both the toroidal direction and the poloidal direction.

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