JP2011022102A - Current sensor and method for manufacturing current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current sensor which enables a reduction of manufacturing cost. <P>SOLUTION: The current sensor includes a plurality of first air-core coils 2(2a) which are prepared by winding a first conductor clockwise around a first winding core and also by winding a second conductor counterclockwise around the first conductor, and second air-core coils 3(3a) which are prepared in the same number as the air-core coils 2(2a) by winding a third conductor counterclockwise around a second winding core and also by winding a fourth conductor clockwise around the third conductor. The air-core coils 2(2a) and 3(3a) are arranged annularly so that one end part of each of the air-core coils 2(2a) and 3(3a) and the other end part of each of the air-core coils 3(3a) and 2(2a) adjacent to each of the air-core coils 2(2a) and 3(3a) are opposed to each other, and the first and fourth conductors are connected in series respectively so as to form a clockwise winding conductor line, while the second and third conductors are connected in series respectively so as to form a counterclockwise winding conductor line, and either of the end parts of both of the conductor lines is connected mutually. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a current sensor for detecting current and a manufacturing method thereof.

  As this type of current sensor, a current sensor using various air-core coils such as a Rogowski coil is known. For example, in the coil disclosed in Japanese Patent Application Laid-Open No. 2004-235595, a lead wire is wound around a circular winding core (air core) in a predetermined winding direction (for example, left-handed winding) to the winding start position 1 After winding a conducting wire over the circumference, the winding direction is reversed (in this example, right-handed), and the winding is further wound over one round to the beginning of winding. That is, in the coil disclosed in this publication (hereinafter also referred to as “conventional current sensor”), the winding direction of the first turn and the winding direction of the second turn with respect to the winding core are opposite to each other. Yes. In this case, in the conventional current sensor, after winding the conducting wire over one turn to the winding start position by winding the first turn around the winding core, the winding is performed on the first turn when winding the second turn. A manufacturing method is adopted in which winding is performed so as to alternately pass outside and inside of the conducting wire.

JP 2004-235595 A (page 2-5, FIG. 4-5)

  However, the conventional current sensor has the following problems. That is, the conventional current sensor is manufactured by a method of winding so that the outer side and the inner side of the conductive wire wound in the first turn pass alternately when the second turn of the conductive wire is wound around the core. In this case, in this type of current sensor, the winding wire is wound around the winding core in a state where a certain amount of tension is applied to the conducting wire so that the displacement of the conducting wire relative to the winding core does not occur. There is a need to. Therefore, when winding the conducting wire for the second turn around the winding core, it is very difficult to wind the conducting wire for the second turn so that the inside of the conducting wire for the first turn which is sufficiently tightened is hidden. ing. For this reason, the conventional current sensor has a problem that its manufacturing cost is increased due to the difficulty of winding the conductive wire around the core.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a current sensor capable of reducing the manufacturing cost and a manufacturing method thereof.

  In order to achieve the above object, the current sensor according to claim 1, wherein the first air-core coil has a first conductor wound clockwise around the first core and a second conductor left-turned around the first conductor. And the same number of second air-core coils as the first air-core coil, in which the third conductor is counterclockwise wound around the second core and the fourth conductor is wound clockwise around the third conductor. The air core coils are arranged in an annular shape so that one end portion of each air core coil and the other end portion of each air core coil adjacent to each air core coil face each other. One conducting wire and each fourth conducting wire are connected in series to form a right-handed conducting line, and each second conducting wire and each third conducting wire are connected in series to form a left-handed conducting line, and both Either one end or the other end of the conductive line is connected to each other That.

  The current sensor according to claim 2 is the current sensor according to claim 1, wherein the other end of the first air-core coil and the one end of the second air-core coil are opposed to each other. The air core coils are alternately arranged so that the one end portion in one air-core coil and the other end portion in the second air-core coil face each other.

  Furthermore, in the method of manufacturing a current sensor according to claim 3, a plurality of first air-core coils are formed in which the first conductor is wound around the first core and the second conductor is wound around the first conductor. In addition, the same number of second air-core coils as the first air-core coils are formed by turning the third conductor around the second core and turning the fourth conductor around the third conductor. By arranging each air core coil in an annular shape so that one end portion of the air core coil and the other end portion of each air core coil adjacent to each air core coil are opposed to each other, Each fourth conductor is connected in series to form a right-handed conductor line, and each second conductor and each third conductor are connected in series to form a left-handed conductor, and one end of each of the two conductors The current sensor is manufactured by connecting one of the head and the other end to each other That.

  A current sensor manufacturing method according to claim 4 is the current sensor manufacturing method according to claim 3, wherein the other end portion of the first air-core coil and the one end portion of the second air-core coil are connected to each other. The air core coils are alternately arranged so as to face each other so that the one end portion of the first air core coil and the other end portion of the second air core coil face each other.

  According to the current sensor of claim 1 and the method of manufacturing the current sensor of claim 3, the first conductor is wound around the first winding core and the second conductor is wound around the first conductor. A plurality of first air-core coils and a plurality of second airs (the same number as the first air-core coils) in which the third conductor is counterclockwise wound around the second core and the fourth conductor is wound around the third conductor. The core coil is annularly arranged so that one end of each air-core coil and the other end of each adjacent air-core coil face each other, and each first conductor and each fourth conductor are connected in series to the right. Forming a wound conductor line and connecting each second conductor and each third conductor in series to form a left-handed conductor line, and connecting one end part and the other end part of both conductor lines to each other Conducted wire wound in the first turn when the second turn of the conductive wire is wound around the winding core The area of the annular region formed by the right-handed conducting line and the area of the annular region formed by the left-handed conducting line without performing a complicated winding operation such as winding so as to alternately pass outside and inside Can be easily manufactured. Thereby, according to this current sensor and its manufacturing method, the manufacturing cost can be sufficiently reduced without degrading the performance.

  According to the current sensor of claim 2 and the method of manufacturing the current sensor of claim 4, the other end of the first air core coil and the one end of the second air core coil are opposed to each other, By arranging the air core coils alternately so that one end of one air core coil and the other end of the second air core coil face each other, a plurality of first air core coils or second air core coils are continuously provided. Compared with the current sensor arranged so that the right-handed conductor line and the left-handed conductor line are deformed into an elliptical shape, for example, the area of the annular region formed by the right-handed conductor line and the left-handed conductor line The area of the annular region formed by can be made equal.

1 is an external view of a current sensor 1. FIG. 3 is an enlarged view of a part of the current sensor 1. FIG. It is an external appearance perspective view of air-core coil 2 (2a), 3 (3a). It is an exploded view of the air-core coils 2 (2a) and 3 (3a). It is sectional drawing of the air-core coil 2 (2a). It is sectional drawing of the air-core coil 3 (3a). It is a front view of the air-core coils 2 (2a) and 3 (3a) which show the end surface by the side of the collar part 12a, and the end surface by the side of the collar part 12b. It is a front view of the board | substrate 50a for drawer | drawing-out parts. It is a front view of the board | substrate 50b for folding | returning parts. It is a front view of the board for connection 50c. It is a front view of the board | substrate 50d for a connection. It is a side view of the state which made the other end part P2 of the air-core coil 2 (3) and the one end part P1 of the air-core coil 3 (2) face each other. It is a side view of the state which connected air core coil 2 (3) and air core coil 3 (2). It is explanatory drawing for demonstrating the relationship between the area of the cyclic | annular area | region formed with the right-handed conducting line LR, and the area of the cyclic | annular area | region formed with the left-handed conducting line LL.

  Embodiments of a current sensor and a method for manufacturing the current sensor according to the present invention will be described below with reference to the accompanying drawings.

  In the current sensor 1 shown in FIGS. 1 and 2, a plurality of air-core coils 2 and a plurality (the same number as the air-core coils 2) of air-core coils 3 are alternately connected to form an annular portion R for current detection. At the same time, the annular portion R is separated at the separation portion S so as to be wound around a measurement object (not shown). In the following description, in order to facilitate understanding, the air-core coils 2 and 3 positioned at the separation portion S of the air-core coils 2 and 3 constituting the annular portion R are replaced with other air-core coils 2. , 3 are also referred to as air-core coils 2a and 3a.

  The air-core coil 2 corresponds to a first air-core coil, and includes a bobbin 10, windings 20a and 20b, spacers 40 and 40, and connection boards 50c and 50d as shown in FIGS. Yes. Further, as will be described later, the air-core coil 2a includes a lead-out portion substrate 50a instead of the connection substrate 50c. As shown in FIG. 4, the bobbin 10 includes a winding core 11 (an example of “first winding core”), a flange portion 12 a disposed at one end P <b> 1 of the winding core 11, and the other end of the winding core 11. The flange part 12b arrange | positioned by P2 is integrally molded with the resin material as an example. In this case, the winding core 11 is formed in a cylindrical shape with an insertion hole H1 through which the core material 4 for connecting the air-core coils 2 and 3 can be inserted as described later. Further, as shown in FIG. 7, the flange portion 12 a is formed with a pair of insertion holes 13 for inserting the windings 20 a and 20 b wound around the core 11, and the flange portion 12 b Are formed with a pair of insertion holes 13 through which the windings 20a and 20b wound around the core 11 are inserted.

  The winding 20a is an example of the first conductor, and as shown in FIG. 5, the winding 20a is wound around the winding core 11 of the bobbin 10 with a right-hand winding, and both ends thereof are inserted into the flanges 12a and 12b. The through holes 13 are inserted and pulled out of the bobbin 10. The winding 20b is an example of a second conductor, and is wound around the winding 20a wound around the winding core 11 in a left-handed manner, and both end portions thereof are insertion holes 13 for the flange portions 12a and 12b. Are inserted and pulled out of the bobbin 10 respectively. In this case, the air-core coil 2 is wound so that the number of turns of the winding 20a and the number of turns of the winding 20b are the same.

  As shown in FIG. 4, the spacer 40 is a cushioning material disposed between the bobbin 10 and the connection substrates 50 c and 50 d, and is formed by an elastic member (for example, a foamed resin material). It is formed in a disk shape having substantially the same diameter as the portions 12a and 12b. In this case, as an example, the spacer 40 is formed in a wedge shape in a side view so that the thickness of the portion positioned inside the annular portion R is thinner than the thickness of the portion positioned outside the annular portion R. . Further, an insertion hole H4 that is communicated with the insertion hole H1 of the bobbin 10 and through which the core material 4 can be inserted is formed in the central portion of the spacer 40. Further, the spacer 40 is formed with an insertion hole (not shown) through which the windings 20a and 20b wound around the bobbin 10 and inserted through the insertion holes 13 of the flanges 12a and 12b can be inserted. Yes.

  The connection boards 50c and 50d are boards for connecting the ends of the windings 20a and 20b to the windings 30a and 30b (see FIG. 6) of the air-core coil 3 described later. The bobbin 10 is attached to the end on the flange 12a side via the spacer 40, and the connection board 50d is attached to the end on the bobbin 10 on the flange 12b side via the spacer 40. As described above, the lead-out portion substrate 50a is attached to the end portion on the flange portion 12a side of the air-core coil 2a disposed in the separation portion S of the annular portion R, instead of the connection substrate 50c. . In this case, as shown in FIGS. 8 to 11, the drawer portion substrate 50a, the folded portion substrate 50b, and the connection substrates 50c and 50d are formed in a disc shape as a whole, and a bobbin is formed in the center portion thereof. 10 insertion holes H1 and the insertion holes H4 of the spacers 40 are connected to form insertion holes H5 through which the core material 4 can be inserted.

  As shown in FIG. 10, the connection board 50c is formed with insertion holes 53 and 53 through which one ends of the windings 20a and 20b drawn from the bobbin 10 can be inserted, respectively, and one end of the winding 20a. Are connected to a connection metal fitting 64 to which one end of the winding 20b is connected. In this case, as an example, the metal fittings 64 and 65 for connection are formed in a plate spring shape by bending a flat metal plate. As shown in FIG. 11, the connection board 50d is formed with insertion holes 53 and 53 through which the other ends of the windings 20a and 20b drawn from the bobbin 10 can be inserted, respectively. A connection pattern 66 to which the end portion is connected and a connection pattern 67 to which the other end portion of the winding 20b is connected are formed. On the other hand, as shown in FIG. 8, the lead-out substrate 50a is formed with insertion holes 53 and 53 through which one end portions of the windings 20a and 20b drawn from the bobbin 10 can be inserted, respectively. For example, a wiring pattern 61 in which one end portion of the winding 20b is connected by soldering and a wiring pattern 62 in which one end portion of the winding 20b is connected by soldering are formed. In this case, a signal cable (not shown) for connecting the current sensor 1 to the measuring device (current detecting device) is connected to the wiring patterns 61 and 62 to the connecting portions 61a and 62a.

  On the other hand, the air-core coil 3 corresponds to a second air-core coil and includes a bobbin 10, windings 30a and 30b, spacers 40 and 40, and connection boards 50c and 50d as shown in FIGS. Configured. Further, as will be described later, the air-core coil 3a includes a folded portion substrate 50b in place of the connection substrate 50d. In addition, about the component which has the same function as said air core coil 2 and 2a in this air core coil 3 and 3a, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. In this case, the air-core coils 3 and 3a are formed by winding the windings 30a and 30b in place of the windings 20a and 20b in the air-core coils 2 and 2a.

  Specifically, the winding 30a is an example of a third conductor, and is wound around the winding core 11 (an example of “second winding core”) in the bobbin 10 in a left-handed manner as shown in FIG. At the same time, the both end portions are inserted through the insertion holes 13 of the flange portions 12a and 12b and pulled out of the bobbin 10, respectively. The winding 30b is an example of a fourth conductor, and is wound around the winding 30a wound around the winding core 11 with a right-hand winding, and both ends thereof are insertion holes for the flange portions 12a and 12b. 13 is inserted and pulled out of the bobbin 10. In this case, the air-core coil 3 is wound such that the number of turns of the winding 30a and the number of turns of the winding 30b are the same.

  In the air-core coils 3 and 3a, both ends of the winding 30a are connected to the connection fitting 64 of the connection substrate 50c and the connection pattern 66 of the connection substrate 50d, respectively, and both ends of the winding 30b. Are connected to the connection metal fitting 65 of the connection substrate 50c and the connection pattern 67 of the connection substrate 50d. Further, in the air-core coil 3a, a folded portion substrate 50b (see FIG. 9) is attached to the end of the bobbin 10 on the flange 12b side instead of the connection substrate 50d. In this case, as shown in FIG. 9, the folded portion substrate 50b is formed with insertion holes 53, 53 through which one end portions of the windings 30a, 30b drawn from the bobbin 10 can be inserted, respectively. A wiring pattern 63 for connecting the windings 30a and 30b inserted through the through hole 53 to each other is formed.

  In the current sensor 1, as described above, the air core coils 2 and 3 are alternately connected to form an annular portion R. Specifically, the other end portion P2 of the air-core coil 2 and the one end portion P1 of the air-core coil 3 face each other, and the one end portion P1 of the air-core coil 2 and the other end portion P2 of the air-core coil 3 face each other. As described above, the core material 4 is inserted into the insertion holes H1, H4, and H5 (hereinafter collectively referred to as “insertion holes H”) of the air core coils 2 and 3, respectively. 2 and the air core coil 3 are alternately arranged to form an annular portion R (“one end portion of each air core coil and the other end portion of each air core coil adjacent to each air core coil face each other. An example of a state in which each air-core coil is annularly arranged as described above]. In this case, as shown in FIG. 12, at one end P1 of the air-core coils 2 and 3, a connection board 50c to which connection fittings 64 and 65 are attached is disposed. A connection substrate 50d on which connection patterns 66 and 67 are formed is disposed at the end portion P2.

  Therefore, as shown in FIG. 13, the other end portion P <b> 2 of the air-core coil 2 and the one end portion P <b> 1 of the air-core coil 3 face each other, and the one end portion P <b> 1 in the air-core coil 2 and the other end portion in the air-core coil 3. By alternately connecting the air core coils 2 and 3 so as to face P2, the connection fitting 64 in the air core coil 2 (3) and the connection pattern 66 in the air core coil 3 (2) are electrically connected. The connection fitting 65 in the air-core coil 2 (3) and the connection pattern 67 in the air-core coil 3 (2) are electrically connected. Thus, the winding 20a of the air-core coil 2 and the winding 30b of the air-core coil 3 are alternately connected via the connection fittings 64 and 65 and the connection patterns 66 and 67, and the right-handed conducting line LR (FIG. 14) and the winding 20b of the air-core coil 2 and the winding 30a of the air-core coil 3 are alternately connected to form a left-handed conducting line LL (see FIG. 14). A path is formed. The two conductive lines LR and LL are connected to each other through the wiring pattern 63 in the folded portion substrate 50b of the air core coil 3a, and the wiring patterns 61 and 62 in the lead portion substrate 50a of the air core coil 2a. Are connected to signal cables connected to each.

  In manufacturing the current sensor 1, first, the air core coil 2 (2a) and the air core coil 3 (3a) are respectively manufactured. Specifically, for example, when the air-core coil 2 is manufactured, after winding the winding 20a inserted through the center portion side insertion hole 13 in the flange portion 12a with a right turn around the winding core 11, the flange portion It is pulled out of the bobbin 10 from the insertion hole 13 near the center in 12b. Next, after winding the winding 20b through which the insertion hole 13 near the outer edge in the flange 12a is inserted in a left-handed manner around the winding 20a, the bobbin 10 is inserted from the insertion hole 13 near the outer edge in the flange 12b. Pull out the outside. Subsequently, one end of each of the windings 20a and 20b is inserted into both the insertion holes 53 of the spacer 40 and both the insertion holes 53 of the connection substrate 50c, and is connected to the flange portion 12a via the spacer 40. While the substrate 50c is attached, the other end of each of the windings 20a and 20b is inserted into both the insertion holes 53 of the spacer 40 and both the insertion holes 53 of the connection substrate 50d, and the spacer 40 is inserted into the flange 12b. The connection board 50d is attached through the vias.

  Next, both ends of the windings 20a and 20b are connected to the connection fittings 64 and 65 of the connection board 50c and the connection patterns 66 and 67 of the connection board 50d by, for example, soldering. Thereby, the air-core coil 2 is completed. In addition, about the manufacturing method of the air core coil 3 and the air core coils 2a and 3a, since it is the same as that of the manufacturing method of said air core coil 2, detailed description is abbreviate | omitted. In this case, when one current sensor 1 is manufactured, the same number of air-core coils 2 and 3 are manufactured. Specifically, as an example, 17 air-core coils 2, 17 air-core coils 3, one air-core coil 2a, and one air-core coil 3a are manufactured (first air-core coil, and Example of 18 second air-core coils).

  Subsequently, the air core coils 2 and 3 are alternately inserted into the core material 4 to form the annular portion R. Specifically, as an example, first, the air core coil 3a is fixed to the end of the core material 4 in a state where the core material 4 is inserted into the insertion hole H of the air core coil 3a from the folded portion substrate 50b side. (For example, bonding). Next, the core material 4 is inserted into the insertion hole H of the air core coil 2 from the connection substrate 50d side. At this time, the connection fittings 64 and 65 of the connection board 50c in the air-core coil 3a and the connection patterns 66 and 67 of the connection board 50d in the air-core coil 2 are in contact with each other, so that the connection fittings 64 and 65 and 65 The winding 30b of the air-core coil 3a and the winding 20a of the air-core coil 2 are connected in series via the connection patterns 66 and 67, and the winding 30a of the air-core coil 3a and the winding of the air-core coil 2 are connected. 20b is connected in series.

  Subsequently, the core material 4 is inserted into the insertion hole H of the air-core coil 3 from the connection substrate 50d side. At this time, the connection fittings 64 and 65 of the connection board 50c in the air-core coil 2 and the connection patterns 66 and 67 of the connection board 50d in the air-core coil 3 are in contact with each other, so that the connection fittings 64 and 65 and 65 The winding 20a of the air-core coil 2 and the winding 30b of the air-core coil 3 are connected in series via the connection patterns 66 and 67, and the winding 20b of the air-core coil 2 and the winding of the air-core coil 3 are connected. 30a is connected in series. Thereafter, the core material 4 is alternately inserted into the insertion hole H in the other air-core coil 2 and the insertion hole H in the other air-core coil 3 in the same procedure as described above.

  Subsequently, after the core material 4 was inserted into the insertion hole H in the 17th air-core coil 3, the core material 4 was inserted into the insertion hole H of the air-core coil 2a from the connection substrate 50d side. In the state, the air core coil 2a is fixed (for example, bonded) to the end of the core material 4. At this time, the connection fittings 64 and 65 of the connection board 50c in the seventeenth air-core coil 3 and the connection patterns 66 and 67 of the connection board 50d in the air-core coil 2a are in contact with each other, so that the connection fittings are connected. The winding 30b of the air-core coil 3 and the winding 20a of the air-core coil 2a are connected in series via the 64, 65 and the connection patterns 66, 67, and the winding 30a of the air-core coil 3 and the air-core coil. The winding 2b of 2a is connected in series. Next, the signal cable is connected to the connection portions 61a and 62a of the wiring patterns 61 and 62 in the lead portion substrate 50a of the air-core coil 2a by, for example, soldering. Thereby, as shown in FIG. 1, the current sensor 1 is completed. In FIG. 1 and FIG. 2, illustration of the signal cable connected to the drawer portion substrate 50a is omitted.

  At the time of current detection using the current sensor 1, as shown in FIG. 2, the annular portion R is separated from the air core coil 2a and the air core coil 3a at the separation portion S and wound around a current detection object (for example, a power line). After that (after the annular portion R is disposed around the current detection object), the air-core coils 2a and 3a are brought into contact with each other as shown in FIG. Further, the wiring pattern 61 (connection portion 61a) and the wiring pattern 62 (connection portion 62a) of the air-core coil 2a are connected to a measurement device (current detection device) via a signal cable. Thereby, it is possible to detect the current flowing through the current detection object inserted through the annular portion R. In this case, in the current sensor 1, in the air core coil 2 (2a), the winding 20a wound around the core 11 (same wire wound inward) and the air core coil 3 (3a) A right-handed conductive line LR (see FIG. 14) formed by alternately connecting windings 30b wound around the winding 30a (same lines wound outward), and an air-core coil 2 (2a ) And a winding 30a (inner side) wound around the core 11 in the air-core coil 3 (3a). And the left-handed conductive line LL (see FIG. 14) formed by being alternately connected to each other by the wiring pattern 63 on the folded portion substrate 50b of the air-core coil 3a. ing.

  Further, in this current sensor 1, the number of the air-core coils 2 (2a) and the number of the air-core coils 3 (3a) are equal to each other (in this example, 17 + 1 = 18), and the annular portion R is connected. Is formed. Therefore, the number of turns in which the winding constituting the right-handed conducting line LR is wound inward (the number of turns of the winding 20a) and the number of turns in which the winding constituting the left-handed conducting line LL is wound inward (winding) The number of turns of the winding 30b) is equal to the number of turns, and the number of turns in which the winding constituting the right-handed conducting line LR is wound outward (number of turns of the winding 20b) and the number of turns constituting the left-handed conducting line LL are The number of turns wound outside (the number of turns of the winding 30b) is equal to the number of turns. For this reason, the average winding diameter of the right-handed conducting line LR as the entire annular portion R and the average winding diameter of the left-handed conducting line LL are equal to each other.

  For this reason, as shown in FIG. 14, in the state in which the air core coils 2a and 3a are brought into contact with each other and the annular portion R is formed, the annular region formed by the right-handed conducting line LR (the left diagram in FIG. 14). And the area of the annular region formed by the left-handed conducting line LL (the region filled with the left-down dashed line in the right figure in FIG. 6) is equal to each other. Become. Thereby, compared with the current sensor in which the areas of the two annular regions (sensor windows) are different from each other, the influence of the external magnetic field entering the two conductive lines LR and LL in a direction intersecting the two annular regions is sufficient. It is getting smaller.

  Thus, according to the current sensor 1 and the manufacturing method thereof, the plurality of air-core coils 2 in which the winding 20a is wound clockwise around the winding core 11 and the winding 20b is wound counterclockwise around the winding 20a, and A plurality of air core coils 3 (the same number as the air core coils 2) are wound around each of the air core coils 2 and 3 by winding the winding 30a counterclockwise around the winding core 11 and winding the winding 30b clockwise around the winding 30a. One end P1 and the other end P2 of each air-core coil 3, 2 adjacent to each air-core coil 2, 3 are arranged in an annular shape, and the windings 20a, 30b are connected in series (mutually). Then, the right-handed conductive line LR is formed, and the windings 20b and 30a are connected in series (mutually) to form the left-handed conductive line LL, and one end portions of both the conductive lines LR and LL are connected to each other. Due to the manufacture, when winding the second turn of the conducting wire around the core Formed by the right-handed conductive line LR composed of the windings 20a and 30b without performing a complicated winding operation such as winding so as to alternately pass outside and inside of the conducting wire wound in the first turn. The current sensor 1 can be manufactured in which the area of the annular region formed is equal to the area of the annular region formed by the left-handed conducting line LL formed by the windings 20b and 30a. Thereby, according to this current sensor 1 and its manufacturing method, the manufacturing cost can fully be reduced, without causing a performance fall.

  Further, according to the current sensor 1 and the manufacturing method thereof, the air-core coils 2 and the air-core coils 3 are alternately arranged, so that a plurality of air-core coils 2 or air-core coils 3 are arranged continuously. Compared with the current sensor, the area of the annular region formed by the right-handed conducting line LR even when the annular part R (the right-handed conducting line LR and the left-handed conducting line LL) is deformed into an elliptical shape, for example, The area of the annular region formed by the left-handed conducting line LL can be made equal.

  The configuration of the current sensor is not limited to the above configuration. For example, although the current sensor 1 in which the core member 4 is inserted and connected to the insertion holes H of the air core coils 2 and 3 to form the annular portion R has been described as an example, each of the first air core coils and It is also possible to employ a configuration in which a connecting mechanism (not shown) is provided in each second air core coil to form an annular portion without using the core material 4 or the like. Further, the current sensor 1 in which the windings 20a, 20b, 30a, and 30b are connected to each other via the connection boards 50c and 50d has been described as an example. However, the windings 20a, 20b, 30a, and 30b are directly connected. It is also possible to adopt a configuration in which a right-handed conducting line and a left-handed conducting line are formed. Further, the current sensor 1 in which the right-handed conducting line LR and the left-handed conducting line LL are connected to each other via the wiring pattern 63 of the folded portion substrate 50b has been described as an example. For example, the winding in the air-core coil 3a is described above. A configuration in which the wires 30a and 30b are directly connected and the right-handed conducting line and the left-handed conducting line are connected to each other may be employed.

  Further, the current sensor 1 in which the air core coil 2 (2a) corresponding to the first air core coil and the air core coil 3 (3a) corresponding to the second air core coil are alternately arranged to form the annular portion R. However, as long as the number of air-core coils 2 (first air-core coils) and the number of air-core coils 3 (second air-core coils) are the same, a plurality of air-core coils 2 are provided. A current sensor can also be configured by adopting a configuration in which a plurality of air-core coils 3 are continuously arranged, in other words, a configuration in which the plurality of air-core coils 3 are continuously arranged.

DESCRIPTION OF SYMBOLS 1 Current sensor 2, 2a, 3, 3a Air-core coil 11 Winding core 20a, 20b, 30a, 30b Winding LL Left-handed conducting line LR Right-handed conducting line P1 One end part P2 Other end part R Annular part

Claims (4)

  A plurality of first air core coils in which the first conductor is wound around the first core and the second conductor is wound around the first conductor are provided around the first core, and the third conductor is disposed around the second core. Is provided with the same number of second air-core coils as the first air-core coils, and one end of each air-core coil and each air-core coil. The air core coils are arranged in an annular shape so that the other end portions of the air core coils adjacent to each other face each other, so that the first conductor wires and the fourth conductor wires are connected in series to the right. A winding line is formed, and each of the second and third conductive lines is connected in series to form a left-handed conducting line, and either one end or the other end of the both conducting lines is mutually connected Connected current sensor.   The other end portion of the first air-core coil and the one end portion of the second air-core coil face each other, and the one end portion of the first air-core coil and the other end portion of the second air-core coil. The current sensor according to claim 1, wherein the air-core coils are alternately arranged so as to face each other.   A plurality of first air-core coils are formed around the first winding core, the first conducting wire is wound clockwise and the second conducting wire is wound counterclockwise around the first conducting wire, and the third conducting wire is formed around the second winding core. The same number of second air-core coils as the first air-core coil, which are left-handed and are wound around the third conductor, are adjacent to the air-core coils and one end of each air-core coil. By connecting each air core coil in an annular shape so that the other end of each air core coil faces each other, the first conductor and the fourth conductor are connected in series to form a right-handed conductor. And forming the left-handed conducting line by connecting the second conducting wire and the third conducting wire in series, and connecting either one end or the other end of the conducting wires to each other. A current sensor manufacturing method for manufacturing a current sensor.   The other end portion of the first air-core coil and the one end portion of the second air-core coil face each other, and the one end portion of the first air-core coil and the other end portion of the second air-core coil. The method of manufacturing a current sensor according to claim 3, wherein the air-core coils are alternately arranged so as to face each other.

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