JP2014206493A - Magnetic field sensor bobbin, and magnetic field sensor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bobbin with few measurement errors, and a magnetic field sensor.SOLUTION: A first bobbin member 12, a second bobbin member 22, and a third bobbin member 32 dispose colar portions 14, 24, and 34 on column portions 13, 23, and 33 for a coil. The collar portion 13 of the first bobbin member 12 is formed to have a diameter smaller than a diameter of the column portion 23 of the second bobbin member 22, and the collar portion 24 of the second bobbin member 22 is formed to have a diameter smaller than a diameter of the column portion 33 of the third bobbin member 32, respectively. In one diameter direction of the column portion 23 of the second bobbin member 22, a rectangular hole 25 for introducing the first bobbin member 12 is provided. In intersecting two diameter directions of the column portion 33 of the third bobbin member 32, a cross hole 35 for simultaneously introducing the first bobbin member 12 and the second bobbin member 22 which are combined is provided. Those bobbin members 12, 22, 32 are formed to enable a combination by a layout relationship in which those bobbin members intersect in three axial directions through the rectangular hole 25 and the cross hole 35.

Description

  The present invention relates to a magnetic field sensor bobbin and a magnetic field sensor using the same, which can detect a magnetic field accurately by matching the axes of three orthogonal axes.

  Many magnetic field measuring instruments that measure magnetic flux or magnetic flux density require two or more axial directions of coils constituting a magnetic field sensor.

  For example, there is a magnetic field sensor disclosed in Patent Document 1 as a magnetic field sensor in which the axial direction of a coil is three orthogonal axes of an X axis, a Y axis, and a Z axis. FIG. 3 is a reprint of the magnetic sensor bobbin shown in FIG.

JP 2006-343178 A

  According to the figure, the magnetic field sensor bobbin 1 is recessed so that the bobbin main body part 2 is a hexahedron and the bobbin main body part 2 is orthogonal to each other with the respective centers positioned. The three annular grooves 3, 4 and 5 are formed, and the grooves 3, 4 and 5 have heights at which the heights of the groove bottom surfaces 3a, 4a and 5a are not identical to each other. It is formed with a difference.

  When the magnetic field sensor bobbin 1 shown in FIG. 3 is used, the wire material is wound around the groove portions 3, 4 and 5 in order from the deepest groove portion 5 side to the groove bottom surfaces 3a, 4a and 5a without winding up. As a result, the magnetic field sensors are formed by aligning the centers of the respective windings in a positional relationship in which the respective windings are orthogonal to each other.

  However, in the case of the magnetic field sensor bobbin 1 shown in FIG. 3, the winding is applied to the groove portion 5 having the deepest depth to the groove bottom surfaces 3 a, 4 a, 5 a, and then the remaining two groove portions 4, 3 are provided. On the other hand, since the windings are applied in order, the windings of the parts orthogonal to the windings of the other axes overlap, and the winding shape becomes linear and deviates from the perfect circle, resulting in an error in the measurement accuracy. There was an inconvenience that occurred.

  Further, in the case of the magnetic field sensor bobbin 1 shown in FIG. 3, all the windings are applied to one bobbin main body part 2, so that any one of the windings of the groove parts 3, 4 and 5 is provided. Even if a trouble occurs, it is not possible to replace only that, and there is a problem that the entire magnetic field sensor has to be handled as a defective product.

  In view of the above-mentioned problems found in the prior art, the present invention makes it possible to perform highly accurate measurement by making the winding shape a perfect circle, and even if any winding has a problem, the corresponding winding An object of the present invention is to provide a magnetic field sensor bobbin capable of exchanging only a line portion and a magnetic field sensor using the bobbin.

The present invention has been made to achieve the above object, and a first invention (bobbin for magnetic field sensor) of the present invention is provided on one side end surface side and the other side end surface side of the cylindrical portion for winding the wire rod. Each of the first bobbin member, the second bobbin member, and the third bobbin member in which the portion is disposed has a second diameter that is smaller than the diameter of the columnar portion of the second bobbin member. The flange portion of the bobbin member is formed in different sizes having a diameter smaller than the diameter of the columnar portion of the third bobbin member, and the opening surface is negative in the one-diameter direction of the columnar portion of the second bobbin member. And a rectangular hole that allows the first bobbin member to be inserted, and the cylindrical surface portion of the third bobbin member has a positive shape and is combined via the square hole in the two-diameter directions perpendicular to each other. A first bobbin member and a second bobbin member; With a cross hole that allows the simultaneous insertion,
The first bobbin member, the second bobbin member, and the third bobbin member are formed so as to be capable of being combined in an arrangement relationship in which the first and second bobbin members are orthogonal to each other in the three-axis directions via the square hole and the cross hole. The most important feature.

  In this case, a fitting portion for stabilizing the entire combination state is provided between at least one of the first bobbin member and the second bobbin member and the third bobbin member. Is preferred.

  On the other hand, in the second invention (magnetic field sensor), the columnar portions of the first bobbin member, the second bobbin member, and the third bobbin member that constitute the magnetic field sensor bobbin described above are respectively The first coil body, the second coil body, and the third coil body are formed by winding each separately so that the output voltages are equal, and the third coil body is combined through the rectangular hole. The most important feature is that the first coil body and the second coil body are combined with each other through the cross-shaped hole to give a function as an orthogonal triaxial coil to the whole.

  According to the first aspect of the present invention, the first bobbin member can be interchangeably combined with the second bobbin member via the square hole, and the first bobbin member and the second bobbin combined in this way are combined. The member can be interchangeably combined with the third bobbin member through the cross hole.

  In addition, the cylindrical portion of the first bobbin member, the cylindrical portion of the second bobbin member, and the cylindrical portion of the third bobbin member can be provided with independent circular windings that do not interfere with each other. A function as a line route can be given.

  According to the second aspect of the present invention, the fitting portion is provided between at least one of the first bobbin member and the second bobbin member and the third bobbin member. The overall shape that is positioned and combined can be maintained more stably.

  According to the third aspect of the present invention, the respective cylindrical portions of the first bobbin member, the second bobbin member, and the third bobbin member are each provided with a winding that is a perfect circle, and the respective output voltages are equal. Since the first coil body, the second coil body, and the third coil body can be formed, by combining these coil bodies, the winding directions are orthogonal to each other and the measurement accuracy is made to match the respective centers. It can be used as a three-axis coil type magnetic field sensor having a high height.

  In addition, when any of the first coil body, the second coil body, and the third coil body constituting the magnetic field sensor has a problem, it can be easily disassembled by following the procedure opposite to the assembly procedure. Can be repaired and replaced easily.

The perspective view shown in the state which decomposed | disassembled an example of the bobbin for magnetic field sensors which concerns on 1st invention. It is explanatory drawing which shows the combination procedure of the bobbin for magnetic field sensors shown in FIG. 1, (a) is the state which combined the 1st bobbin member and the 2nd bobbin member, (b) is the combined state of (a) Each of the states is further combined with the third bobbin member. FIG. 2 is a reprint of a magnetic sensor bobbin shown in FIG.

  FIG. 1 is a perspective view showing an exploded state of an example of a magnetic field sensor bobbin according to the first aspect of the present invention. According to the figure, the magnetic field sensor bobbin 11 has a diameter larger than the diameter of the cylindrical portions 13, 23, 33 on one side end surface side and the other side end surface side of the cylindrical portions 13, 23, 33 for winding the wire. The first bobbin member 12, the second bobbin member 22, and the third bobbin member 32 having the same thickness, in which the flange portions 14, 24, and 34 are arranged in pairs, constitute the whole.

  Moreover, each of the first bobbin member 12, the second bobbin member 22, and the third bobbin member 32 is such that the flange portion 14 of the first bobbin member 12 has a slightly smaller diameter than the diameter of the columnar portion 23 of the second bobbin member 22. The flange portions 24 of the second bobbin member 23 are formed separately under different sizes having a diameter slightly smaller than the diameter of the columnar portion 33 of the third bobbin member 32.

  That is, the first bobbin member 12 made of an insulating synthetic resin material positioned at the top in FIG. 1 has one end face side with respect to a cylindrical portion 13 formed with an appropriate diameter and thickness. And the other end face side are arranged in pairs with the flange portions 14 each having a diameter slightly larger than the diameter of the cylindrical portion 13 to form a whole.

  Further, the second bobbin member 22 made of an insulating synthetic resin material located in the middle in FIG. 1 is formed with a diameter slightly larger than the diameter of the flange portion 14 of the first bobbin member 12. The cylindrical portion 23 is arranged in pairs with a flange portion 24 having a diameter slightly larger than the diameter of the cylindrical portion 23 on each of the one end face side and the other end face side. Is formed.

  Moreover, in the one-diameter direction of the second bobbin member 22, the first bobbin member 22 is penetrated from the one flange part 24 through the column part 23 to the other flange part 24 so that the opening surface 26 exhibits a negative shape. A square hole 25 that allows insertion of the bobbin member 12 is formed.

  In this case, the square hole 25 has one width in the length direction that is slightly longer than the diameter of the flange 14 that is the maximum diameter of the first bobbin member 12 and the other width of the first bobbin member 12. By making the length slightly longer than the thickness, as shown in FIG. 2A, the first bobbin member 12 can be surely introduced and arranged on the second bobbin member 22 side without swinging. Is formed.

  Further, a fitting portion 42 for stabilizing the combined state as shown in FIG. 2A can be formed between the first bobbin member 12 and the second bobbin member 22. .

  Specifically, for example, a small protrusion 43 is provided at a circular center position on the outer surface 14a side of each flange 14 in the first bobbin member 12, and both side wall surfaces 14a in the length direction of the rectangular hole 25 in the second bobbin member 22 are provided. A fitting hole 42 can be formed when combined as shown in FIG. 2A, for example, by providing a small hole 44 that fits into the small protrusion 43 at the center position in the vertical and horizontal directions. Thus, the combined state of the first bobbin member 12 and the second bobbin member 22 can be stabilized.

  The third bobbin member 32 made of an insulating synthetic resin material positioned at the lowest position in FIG. 1 is formed with a diameter slightly larger than the diameter of the flange portion 24 of the second bobbin member 22. With respect to the cylindrical part 33, the collar part 34 provided with a diameter slightly larger than the diameter of the cylindrical part 33 on each of the one side end face side and the other side end face side is disposed as a pair, and the whole is formed. Is formed.

  In addition, in the two orthogonal diameter directions of the third bobbin member 32, by passing through the cylindrical portion 33 from the one flange 34 to the other flange 34 so that the opening surface 38 exhibits a minus shape, A cross hole 35 that allows simultaneous insertion of the first bobbin member 12 and the second bobbin member 22 in a combined state is formed.

  The cross hole 35 in this case is a short dimension that allows insertion of the first bobbin member 12 out of the first bobbin member 12 and the second bobbin member 22 in a combined state as shown in the upper side of FIG. The hole 36 and a long hole 37 that allows the second bobbin member 22 to be inserted are formed.

  That is, the short hole 36 in the cross hole 35 has one width in the length direction slightly longer than the diameter of the flange 14 that is the maximum diameter of the first bobbin member 12 and the other width in the first hole 35. By making the length slightly longer than the thickness of the 1 bobbin member 12, the first bobbin member 12 side is formed so as to be surely introduced and arranged on the third bobbin member 32 side without rattling.

  Further, the long hole portion 37 in the cross hole 35 has one width in the length direction slightly longer than the diameter of the flange portion 24 that is the maximum diameter of the second bobbin member 22 and the other width in the first hole portion 37. By making the length slightly longer than the thickness of the two bobbin member 22, the second bobbin member 12 is formed so as to be surely introduced and arranged on the third bobbin member 32 side without causing the second bobbin member 12 side to rattle.

  For this reason, the first bobbin member 12 and the second bobbin member 22 in a combined state as shown in the upper side of FIG. 2A are in contrast to the third bobbin member 32 shown in the lower side of FIG. The first bobbin member 12 side is simultaneously fed into the short hole portion 36 and the second bobbin member 22 side is simultaneously fed into the long hole portion 37, so that the whole is as shown in FIG. Can be assembled as.

  Also, a fitting portion 45 may be formed between the second bobbin member 22 and the third bobbin member 32 in order to stabilize the combined state as shown in FIG. it can.

  Specifically, for example, when the second bobbin member 22 side is introduced into the elongated hole portion 37 in the cross hole 35 of the third bobbin member 32, each side of the second bobbin member 22 in a positional relationship facing each other. A small protrusion 46 is provided on the outer surface 24 a of the portion 24, and a small hole portion 47 that fits the small protrusion 46 is provided on both side wall surfaces 37 a of the long hole portion 37 in the cross hole 35 of the third bobbin member 32. Thus, the first bobbin member 12, the second bobbin member 22, and the third bobbin member 32 are used for the magnetic field sensor by allowing the fitting portion 45 to be formed when combined as shown in FIG. The bobbin 11 can be stably combined.

  On the other hand, the magnetic field sensor 51 according to the second invention formed by winding the magnetic field sensor bobbin 11 having such a structure will be described. The first bobbin member disassembled as shown in FIG. 12, second bobbin member 22, and third bobbin member 32 are respectively wound with windings (not shown) so that the respective output voltages are equal.

  In this case, the windings are wound roundly in the respective circumferential directions of the cylindrical portions 13, 23, 33 so that all of the windings have appropriate thicknesses that do not exceed the peripheral height of the flanges 14, 24, 34. Thus, the first coil body 19, the second coil body 29, and the third coil body 39 having the same output voltage are formed. Note that both end portions of each winding are respectively drawn out to the power feeding side.

  The first coil body 19, the second coil body 29, and the third coil body 39 after the windings are individually applied in this way are the first bobbin member 12, the second bobbin member 22, and the first coil body already described. Through a combination procedure with the three bobbin member 32, the magnetic field sensor 51 is formed by combination under the arrangement relationship as shown in FIG. 2B, and a function as an orthogonal three-axis coil is given to the whole. Will be able to.

  Since the present invention is configured as described above, the cylindrical portions 13, 23, 33 in the first bobbin member 12, the second bobbin member 22, and the third bobbin member 32 are individually wound. The first coil body 19, the second coil body 29, and the third coil body 39 can be formed with the same output voltage.

  The first coil body 19 that has finished the winding to the first bobbin member 12 side is integrated integrally through a square hole 25 provided in the second coil body 29 that has also finished the winding to the second bobbin member 22 side. Combined.

  At this time, when the fitting portion 42 is formed between the first bobbin member 12 and the second bobbin body member 22, the combined state as shown in the upper side of FIG. I can keep it.

  After the first coil body 19 and the second coil body 29 are integrally combined, the third coil is located at the position shown on the lower side of FIG. Combined with the body 39.

  That is, the first coil body 19 and the second coil body 29 combined in the relationship shown in the upper side of FIG. 2A are the third coils in the relationship shown in the lower side of FIG. With respect to the body 39, the first coil body 19 side is simultaneously fed into the short hole portion 36, and the second coil body 29 side is simultaneously fed into the long hole portion 37, so that the overall shape as shown in FIG. As a result, the magnetic field sensor 51 having a function as a three-axis coil in which the center positions of the windings coincide with each other and are orthogonal to each other can be formed.

  In addition, at this time, when the fitting portion 45 is formed between the second coil body 29 side and the third coil body 39 side, the combined state as shown in FIG. Thus, the performance as a triaxial coil can be more stably exhibited.

  In other words, according to the first aspect of the present invention, the first bobbin member 12 can be interchangeably combined with the second bobbin member 22 via the square hole 25, and the first bobbin member 12 combined in this way. The first bobbin member 12 and the second bobbin member 22 can be interchangeably combined with the third bobbin member 32 through the cross hole 35.

  Moreover, the cylindrical portion 13 of the first bobbin member 12, the cylindrical portion 23 of the second bobbin member 22, and the cylindrical portion 33 of the third bobbin member 32 are provided with round windings that do not interfere with each other. The function as an independent winding route that can be performed can be provided.

  In the first invention, when the fitting portion 45 is provided between at least one of the first bobbin member 12 and the second bobbin member 22 and the third bobbin member 32, the The overall shape that is positioned and combined can be maintained more stably.

  On the other hand, according to the second invention, the cylindrical portions 13, 23, 33 in the first bobbin member 12, the second bobbin member 22, and the third bobbin member 32 are each provided with a winding that is a perfect circle. Since the first coil body 19, the second coil body 29, and the third coil body 39 can be formed with the same output voltage, the first coil body 19, the second coil body 29, and the third coil body can be formed. 39 can be used as an orthogonal three-axis coil type magnetic field sensor 51 with high measurement accuracy in which the winding directions are orthogonal to each other and the centers thereof are matched.

  Moreover, when any of the first coil body 19, the second coil body 29, and the third coil body 39 constituting the magnetic field sensor 51 has a problem, it is easy to follow the procedure reverse to the assembly procedure. Therefore, repair and replacement can be easily performed.

  The present invention has been described with reference to the illustrated example, and the specific contents thereof are not limited thereto. For example, the first bobbin member 12 and the second bobbin member 22 may be combined without forming the fitting portion 42. Further, when the fitting portion 42 is formed between the first bobbin member 12 and the second bobbin member 22, a small hole portion is provided on the first bobbin member 12 side, and a small hole is provided on the second bobbin member 22 side. You may enable it to form the fitting part 42 by providing a protrusion. Further, the fitting portion 45 formed between the second bobbin member 22 and the third bobbin member 32 also has a small hole portion on the second bobbin member 12 side and a small protrusion on the third bobbin member 32 side. It may be formed by.

  Moreover, according to the example of illustration, although the 1st bobbin member 12, the 2nd bobbin member 22, and the 3rd bobbin member 32 differ in the size in a diameter direction, all are formed by the same thickness. If the first coil body 19, the second coil body 29, and the third coil body 39 can be equalized when the first coil body 19, the second coil body 29, and the third coil body 39 are formed by winding each of them, as desired Thus, they can be formed with different thicknesses. Further, unless particularly necessary, the fitting portion 42 between the first bobbin member 12 and the second bobbin member 22 and the fitting portion 45 between the second bobbin member 22 and the third bobbin member 32 are formed. Can be omitted.

  Furthermore, the fitting portion 45 can be formed not between the second bobbin member 22 and the third bobbin member 32 but between the first bobbin member 12 and the third bobbin member 32.

DESCRIPTION OF SYMBOLS 11 Magnetic field sensor bobbin 12 1st bobbin member 13 Cylindrical part 14 collar part 14a outer surface 19 1st coil body 22 2nd bobbin member 23 Cylindrical part 24 collar part 24a Outer surface 25 Square hole 25a Side wall surface 26 Opening surface 29 2nd Coil body 32 Third bobbin member 33 Cylindrical portion 34 Gutter portion 35 Cross hole 36 Short hole portion 37 Long hole portion 37a Side wall surface 38 Open surface 39 Third coil body 42 Fitting portion 43 Small protrusion 44 Small hole portion 45 Fitting 46 Small projection 47 Small hole 51 Magnetic field sensor

Claims (3)

Each of the first bobbin member, the second bobbin member, and the third bobbin member, in which the flanges are disposed on the one side end surface side and the other side end surface side of the column portion for winding the wire, The flange is smaller in diameter than the cylindrical portion of the second bobbin member, and the flange of the second bobbin member is formed in different sizes with different diameters smaller than the diameter of the cylindrical portion of the third bobbin member.
In the one-diameter direction of the cylindrical portion of the second bobbin member, the opening surface has a negative shape and has a square hole that allows the first bobbin member to be inserted,
A cross shape that allows simultaneous insertion of the first bobbin member and the second bobbin member that are combined with each other through the square holes in the two diameter directions perpendicular to the cylindrical portion of the third bobbin member. With holes,
The first bobbin member, the second bobbin member, and the third bobbin member are formed so as to be capable of being combined in an arrangement relationship in which the first and second bobbin members are orthogonal to each other in the three-axis directions via the square hole and the cross hole. A bobbin for a magnetic field sensor. The fitting part for stabilizing the whole combined state was provided between at least one of the first bobbin member and the second bobbin member and the third bobbin member. The magnetic field sensor bobbin described. 3. The output voltages of the first bobbin member, the second bobbin member, and the third bobbin member constituting the magnetic field sensor bobbin according to claim 1 are equal to each other. And winding each separately to form a first coil body, a second coil body and a third coil body,
By combining the first coil body and the second coil body combined with the third coil body through the square hole through the cross-shaped hole, a function as an orthogonal triaxial coil can be obtained as a whole. A magnetic field sensor characterized by being provided.

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