Magnetic sensor device

Abstract

The invention relates to a magnetic sensor device which can easily arrange a magnetic sensor in a manner that the position of the magnetic sensor relative to a rotating shaft becomes a design position. A magnetic sensor device (3) is provided with: a magnetic sensor (4) having a magnetic wire that plays a large Barkhausen effect; a yoke (21); a housing (22) that houses the magnetic sensor (4) and the yoke (21); and a sensor fixing part (28) that fixes the housing (22) to a substrate. A terminal (15) of the magnetic sensor (4) is a compressed terminal, and the housing (22) is fixed to the substrate by a sensor fixing portion (28), so that the terminal (15) is pressed against a conductor portion of the substrate and electrically connected to the conductor portion.

Description

Technical Field

[0001] The present invention relates to a magnetic sensor device utilizing a large Barkhausen effect. Background Art

[0002] The magnetic sensor utilizing the large Barkhausen effect comprises: a magnetic wire that exerts the large Barkhausen effect, a bobbin with a magnetic wire disposed inside, a coil formed by winding an electric wire around the bobbin, and two terminals for connecting the coil to an external detection circuit. The two terminals are respectively fixed to the two ends of the bobbin. Among the two terminals, one terminal is connected to one end of the electric wire forming the coil, and the other terminal is connected to the other end of the electric wire forming the coil. The magnetic sensor, for example, welds the ends of the two terminals to a conductor portion such as a pad disposed on a substrate, thereby being electrically connected to the circuit on the substrate. In addition, by welding each terminal to the conductor portion, the magnetic sensor is fixed to the substrate, and the position of the magnetic sensor on the substrate is determined. An example of such a magnetic sensor is described in International Publication No. 2016 / 021074 (Patent Document 1).

[0003] For example, as described in International Publication No. 2016 / 021074, when a magnetic sensor is used to detect the rotation of a rotating shaft, a magnet is fixed to the outer periphery of the rotating shaft so that a rotating magnetic field is formed on the outer periphery of the rotating shaft when the rotating shaft rotates. In addition, a plurality of magnetic sensors are provided on a substrate, and the substrate is provided on the outer periphery of the rotating shaft in a manner that does not contact the rotating shaft or any of the magnets. A plurality of magnetic sensors are arranged near the rotating track of the magnet and at positions different from each other in the direction of rotation of the magnet. Thus, a plurality of magnetic sensors can be used to detect the rotating magnetic field formed by the rotation of the rotating shaft, and the rotation amount and direction of rotation of the rotating shaft can be detected based on the detection signal output from the coil of each magnetic sensor.

[0004] Patent Document 1: International Publication No. 2016 / 021074

[0005] For example, when forming a rotation detection device that uses a magnetic sensor to detect the rotation of a rotating shaft, a substrate provided with the magnetic sensor is provided on the outer peripheral side of the rotating shaft. When manufacturing such a rotation detection device, in the past, the magnetic sensor was first fixed to the substrate by welding, and then the substrate to which the magnetic sensor was fixed was fixed to a housing or the like that supports the rotating shaft so that it can rotate, for example, via a component such as a bracket.

[0006] In order to improve the detection accuracy of the magnetic sensor for the rotation of the rotating shaft, it is necessary to configure the magnetic sensor in such a way that the distance between the axis of the rotating shaft and the magnetic sensor and the position of the magnetic sensor relative to the rotating shaft are the designed positions. However, in the process of manufacturing the rotation detection device, the position of the magnetic sensor relative to the rotating shaft may deviate from the designed position.

[0007] As one of the reasons for the positional displacement of the magnetic sensor relative to the rotating shaft, it is conceivable that the position of the magnetic sensor relative to the substrate is displaced during the welding process of welding the magnetic sensor to the substrate. In addition, as another reason for the positional displacement of the magnetic sensor relative to the rotating shaft, it is conceivable that the position of the substrate relative to the housing is displaced during the substrate installation process of installing the substrate welded with the magnetic sensor on a housing that supports the rotating shaft so as to be rotatable. Therefore, in order to configure the magnetic sensor in such a way that the position of the magnetic sensor relative to the rotating shaft becomes the designed position, both the positioning of the magnetic sensor relative to the substrate in the welding process and the positioning of the substrate relative to the housing in the substrate installation process must be strictly performed. Therefore, it is not easy to configure the magnetic sensor in such a way that the position of the magnetic sensor relative to the rotating shaft becomes the designed position. Summary of the invention

[0008] The present invention is completed in view of problems such as those mentioned above, and the subject of the present invention is to provide a magnetic sensor device that can easily configure the magnetic sensor in such a way that the position of the magnetic sensor relative to the rotating shaft becomes a designed position when forming a rotation detection device that uses a magnetic sensor to detect the rotation of a rotating shaft.

[0009] In order to solve the above-mentioned problems, the magnetic sensor device of the present invention is characterized in that it comprises: a magnetic sensor, and a sensor fixing part that uses a fixing part to fix the above-mentioned magnetic sensor to the above-mentioned substrate, the above-mentioned magnetic sensor has: a magnetic wire that exerts a large Barkhausen effect, a winding tube in which the above-mentioned magnetic wire is arranged, a coil formed by winding an electric wire around the above-mentioned winding tube, and two terminals arranged on the above-mentioned winding tube and used to electrically connect one end and the other end of the above-mentioned electric wire to two conductor parts arranged on the substrate, respectively, the above-mentioned two terminals are compression terminals, and the above-mentioned magnetic sensor is fixed to the above-mentioned substrate by the above-mentioned sensor fixing part and the above-mentioned fixing part, so that the above-mentioned two terminals are respectively pressed against the above-mentioned two conductor parts and are respectively electrically connected to the above-mentioned two conductor parts.

[0010] For example, when manufacturing a rotation detection device that detects the rotation of a rotating shaft by a magnetic sensor, in the past, a welding process of welding the magnetic sensor to a substrate and a substrate mounting process of mounting the substrate with the magnetic sensor welded thereon to a housing or the like that supports the rotating shaft so as to be rotatable were performed. Therefore, in order to arrange the magnetic sensor in such a way that the position of the magnetic sensor relative to the rotating shaft becomes the designed position, the staff must strictly perform both the positioning of the magnetic sensor relative to the substrate in the welding process and the positioning of the substrate relative to the housing or the like in the substrate mounting process. In contrast, in the magnetic sensor device of the present invention, the magnetic sensor is fixed to the substrate by a sensor fixing portion and a fixing member, thereby, the two terminals of the magnetic sensor can be pressed against the two conductor portions of the substrate respectively and electrically connected thereto, so that the staff can perform the operation of fixing the magnetic sensor to the substrate after mounting the substrate on the housing or the like. Therefore, when the staff fixes the magnetic sensor to the substrate, for example, a positioning device having a shooting unit and an image processing unit, or a dedicated clamp, etc. can be used to position the magnetic sensor relative to the rotating shaft, thereby, the magnetic sensor can be easily arranged in such a way that the position of the magnetic sensor relative to the rotating shaft becomes the designed position. In the magnetic sensor device of the present invention, since there is no welding process for welding the magnetic sensor to the substrate, the magnetic sensor will not be displaced relative to the substrate during the welding process. In addition, even if the substrate is displaced relative to the housing when the substrate on which the magnetic sensor is not yet provided is mounted to the housing, the position of the magnetic sensor relative to the substrate can be adjusted so that the position of the magnetic sensor relative to the rotation axis is the designed position when the magnetic sensor is mounted on the substrate. By this adjustment, the displacement of the substrate relative to the housing can be absorbed.

[0011] The magnetic sensor device of the present invention may include a yoke for controlling the direction of a magnetic flux of an external magnetic field, and a housing for accommodating the magnetic sensor and the yoke, wherein the sensor fixing portion is provided in the housing.

[0012] In addition, in the magnetic sensor device of the present invention, there are a plurality of magnetic sensors and a housing for accommodating the plurality of magnetic sensors, and the plurality of magnetic sensors may be arranged on a reference plane that is the same as or parallel to the lower surface of the housing, around a reference line orthogonal to the reference plane, at a predetermined interval in the circumferential direction and in a manner such that the extension direction of the magnetic line is parallel to the reference plane. In this case, there may be a plurality of magnetic yokes for controlling the direction of the magnetic flux of the external magnetic field, the plurality of magnetic yokes being arranged in a one-to-one correspondence with the plurality of magnetic sensors, and the plurality of magnetic yokes being accommodated in the housing together with the plurality of magnetic sensors.

[0013] According to the present invention, for example, when forming a rotation detection device that detects the rotation of a rotating shaft using a magnetic sensor, the magnetic sensor can be easily arranged so that the position of the magnetic sensor relative to the rotating shaft is the designed position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an explanatory diagram showing a state of a rotation detection device including a magnetic sensor device according to an embodiment of the present invention, as viewed from above.

[0015] Figure 2 It means along Figure 1 A cross-sectional view of the cross section of the rotation detection device cut along the cutting line II-II as viewed from the lateral direction.

[0016] Figure 3 It is a perspective view showing a magnetic sensor device and a substrate according to an embodiment of the present invention.

[0017] Figure 4 It is an explanatory diagram showing a state of the magnetic sensor device according to the embodiment of the present invention as viewed from below.

[0018] Figure 5 (A) is a perspective view showing a state of the magnetic sensor in the magnetic sensor device according to the embodiment of the present invention as viewed from the upper rear right. Figure 5 (B) is a perspective view showing a state of the bobbin in the magnetic sensor as viewed from the upper rear right.

[0019] Figure 6 This is a perspective view showing a state of a terminal in the magnetic sensor of the magnetic sensor device according to the embodiment of the present invention, as viewed from the upper rear right.

[0020] Figure 7 (A) is an external view showing a state in which the right portion of a bobbin in a magnetic sensor of a magnetic sensor device according to an embodiment of the present invention is viewed from the rear. Figure 7 (B) is an external view showing a state where the right portion of the bobbin in the magnetic sensor is viewed from below.

[0021] Figure 8 It means along Figure 7 A cross-sectional view of the right portion of the bobbin and the terminal cut along the cutting line VIII-VIII in (A) as seen from the right.

[0022] Fig. 9 This is a perspective view showing a state of the magnetic sensor and the yoke in the magnetic sensor device according to the embodiment of the present invention as viewed from the upper front right.

[0023] Fig.10It is an explanatory diagram showing a method of attaching a magnetic sensor to a housing in the magnetic sensor device according to the embodiment of the present invention.

[0024] Fig.11 It is an explanatory diagram showing the arrangement of the magnetic sensor and the yoke in the casing of the magnetic sensor device according to the embodiment of the present invention.

[0025] Fig.12 It is an explanatory diagram showing the arrangement of the magnetic sensor and the yoke in the casing of the magnetic sensor device according to the embodiment of the present invention.

[0026] Fig.13 It is an explanatory diagram showing a method of performing positioning of the magnetic sensor device according to the embodiment of the present invention.

[0027] Fig.14 It is an explanatory diagram showing the magnetic field detection operation of the magnetic sensor and the like in the magnetic sensor device according to the embodiment of the present invention.

[0028] Fig.15 It is an explanatory diagram showing a first modified example of the magnetic sensor device according to the embodiment of the present invention.

[0029] Fig.16 It is an explanatory diagram showing a second modified example of the magnetic sensor device according to the embodiment of the present invention.

[0030] Fig.17 It is an explanatory diagram showing another embodiment of the magnetic sensor device of the present invention.

[0031] Fig.18 It is an explanatory diagram showing still another embodiment of the magnetic sensor device of the present invention.

[0032] Fig.19 It is an explanatory diagram showing a modified example of the terminal in the magnetic sensor of the magnetic sensor device of the present invention.

[0033] Description of Reference Numerals

[0034] 3, 51, 61, 71…magnetic sensor device; 4…magnetic sensor; 5…magnetic wire; 6…bobbin; 15, 81…terminal; 21…yoke; 22, 52, 62…housing; 28, 53, 63, 72…sensor fixing portion; 29…bolt (fixing member); 30…nut (fixing member); S…reference plane; Q…reference line. DETAILED DESCRIPTION

[0035] (Rotation detection device)

[0036] Figure 1 The rotation detection device 1 including the magnetic sensor device 3 according to the embodiment of the present invention is shown as viewed from above. Figure 2 Shown along Figure 1 The cross section of the rotation detection device 1 cut by the cutting line II-II in FIG. Figure 1 The middle is the state of observation.

[0037] exist Figure 1 In the embodiment, the rotation detection device 1 is a device that detects the rotation of a rotating shaft 40 as a rotating body. For example, the rotating shaft 40 is an output shaft of a motor, and the rotation detection device 1 is mounted on the motor.

[0038] The rotation detection device 1 includes a magnetic field forming member 2 that forms a rotating magnetic field, a magnetic sensor device 3 that detects the rotating magnetic field, and a substrate 31 .

[0039] The magnetic field forming member 2 is formed into a ring shape by a magnetic material such as ferrite. The magnetic field forming member 2 is arranged coaxially with the rotating shaft 40 on the outer peripheral side of the rotating shaft 40 and is fixed to the rotating shaft 40. The magnetic field forming member 2 is a magnet that has undergone multi-pole magnetization. In the outer peripheral side portion of the magnetic field forming member 2, four magnetic poles of N pole, S pole, N pole, and S pole are formed in this order, for example, at intervals of 90 degrees in the circumferential direction of the magnetic field forming member 2. In addition, the magnetic field forming member 2 can also be formed by four magnets that are not subjected to multi-pole magnetization.

[0040] The substrate 31 is disposed on the outer peripheral side of the rotating shaft 40. In addition, the substrate 31 is disposed near the magnetic field forming member 2. The substrate 31 is arranged in such a manner that its mounting surface 31A faces upward. Figure 2 As shown, the substrate 31 is arranged so that a plane including the mounting surface 31A is orthogonal to the rotation axis X of the rotating shaft 40. In addition, a shaft insertion hole 32 is formed in the central portion of the substrate 31, and the rotating shaft 40 is inserted into the shaft insertion hole 32. The center of the shaft insertion hole 32 coincides with the rotation center of the rotating shaft 40. In addition, the diameter of the shaft insertion hole 32 is larger than the outer diameter of the rotating shaft 40, and the rotating shaft 40 does not contact the substrate 31. In addition, the substrate 31 is fixed to a housing 41 of a motor that supports the rotating shaft 40 so that it can rotate, for example, via a bracket 42.

[0041] As described later, the magnetic sensor device 3 is formed by housing and fixing three magnetic sensors 4 and three yokes 21 in one housing 22. Figure 1 , three magnetic sensors 4 and three magnetic yokes 21 housed in the housing 22 are shown by dotted lines. The magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 by aligning the reference line Q of the housing 22 with the rotation axis X of the rotating shaft 40 and placing the lower surface of the housing 22 on the mounting surface 31A of the substrate 31. In addition, as described later, the magnetic sensor device 3 is fixed to the substrate 31 by a plurality of sensor fixing portions 28 provided on the housing 22.

[0042] In the state where the magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 in this way, the three magnetic sensors 4 are arranged on the mounting surface 31A of the substrate 31. In addition, the three magnetic sensors 4 are arranged on the outer peripheral side of the magnetic field forming member 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming member 2. In addition, each magnetic sensor 4 is arranged in a manner that the extension direction of the magnetic wire 5 is parallel to the mounting surface 31A of the substrate 31. In addition, when the mounting surface 31A of the substrate 31 is observed from above, each magnetic sensor 4 is arranged so that the central part of the extension direction of the magnetic wire 5 (strictly speaking, the central part in the extension direction of the central axis of the magnetic wire 5) is tangent to the circle D drawn on the outer peripheral side of the magnetic field forming member 2 with the rotation center of the rotation axis 40 as the center.

[0043] In addition, in a state where the magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 as described above, three yokes 21 are arranged on the mounting surface 31A of the substrate. The three yokes 21 are arranged in a one-to-one correspondence with the three magnetic sensors 4. In addition, the three yokes 21 are arranged on the outer peripheral side of the magnetic field forming member 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming member 2. In addition, each yoke 21 is arranged on the inner peripheral side of the magnetic sensor 4 in a manner adjacent to the magnetic sensor 4.

[0044] The magnetic field forming component 2 does not contact any of the three magnetic sensors and the three magnetic yokes. In addition, the magnetic field forming component 2 rotates together with the rotating shaft 40, while the magnetic sensor device 3 does not move. If the magnetic field forming component 2 rotates together with the rotating shaft 40, the magnetic field formed by the magnetic field forming component 2 rotates. As a result, a rotating magnetic field rotating around the rotation axis X of the rotating shaft 40 is formed. The three magnetic sensors 4 detect the rotating magnetic field. Specifically, the direction of the magnetic field acting on each magnetic sensor 4 changes by rotating the magnetic field formed by the magnetic field forming component 2. Each magnetic sensor 4 outputs a pulse signal corresponding to the change in the direction of the magnetic field. Based on the pulse signal output from each magnetic sensor 4, the rotation amount and rotation direction of the rotating shaft 40 can be detected.

[0045] (Magnetic sensor device)

[0046] Figure 3 The magnetic sensor device 3 in a state where it is not mounted on the substrate 31 and the substrate 31 are shown as viewed from an oblique upper side. Figure 4 The magnetic sensor device 3 is shown as viewed from below.

[0047] The magnetic sensor device 3 includes three magnetic sensors 4, three yokes 21, and a housing 22. The magnetic sensor device 3 is a device in which the three magnetic sensors 4 and the three yokes 21 are integrated via the housing 22. Figure 3As shown, three magnetic sensors 4 and three magnetic yokes 21 are housed and fixed in a housing 22. Specifically, as Figure 4 As shown, the three magnetic sensors 4 are installed in three sensor receiving holes 25 provided on the lower surface of the housing 22. In addition, the three yokes 21 are embedded in the housing 22. The three magnetic sensors 4 and the three yokes 21 are arranged at predetermined positions in the housing 22. In addition, the three magnetic sensors 4 are all the same sensors. In addition, the three yokes 21 are all the same yokes.

[0048] (Magnetic sensor and yoke)

[0049] The magnetic sensor 4 and the yoke 21 are described. For the convenience of description, the directions of the front (Fd), rear (Bd), top (Ud), bottom (Dd), left (Ld), and right (Rd) of the magnetic sensor 4 and the yoke 21 are shown in FIG. Figures 5 to 10 , as defined by the arrow depicted at the lower right of 13.

[0050] Figure 5 (A) shows a state where one of the three magnetic sensors 4 is viewed from the upper rear right. Figure 5 (B) shows the state of the bobbin 6 of the magnetic sensor 4 as viewed from the upper rear right.

[0051] The magnetic sensor 4 is a part of the magnetic sensor device 3 that detects the rotating magnetic field. Figure 5 As shown in FIG. 8 (A), the magnetic sensor 4 includes a magnetic wire 5 , a bobbin 6 , a coil 13 , and two terminals 15 .

[0052] The magnetic wire 5 is a magnetic wire that exerts a large Barkhausen effect, and is a wire material called a composite magnetic wire. The magnetic wire 5 is formed, for example, of a semi-hard magnetic material containing iron and cobalt, and has a diameter of, for example, about 0.1 mm to 1 mm, and a length of, for example, about 10 mm to 30 mm. The magnetic wire 5 is formed, for example, by drawing the semi-hard magnetic material and twisting it multiple times while changing the direction. The magnetic wire 5 has a uniaxial anisotropy in which the direction of easy magnetization is the direction of the central axis of the magnetic wire 5. In addition, in the magnetic wire 5, the coercive force of the central side portion is greater than the coercive force of the peripheral side portion. The magnetic wire 5 has the property that the magnetization direction of the magnetic wire 5 (the peripheral side portion thereof) is rapidly reversed according to the change in the direction of the external magnetic field.

[0053] The bobbin 6 is formed of a non-magnetic material such as resin. The bobbin 6 has a bilaterally symmetrical shape. Figure 5As shown in (B), the bobbin 6 includes a wire winding portion 7, two wire support portions 8, two flange portions 9, and a wire receiving groove 10. The wire winding portion 7 is arranged in the middle portion of the bobbin 6 in the left-right direction, and is formed into a cylindrical shape extending in the left-right direction. The wire support portion 8 is provided at the left end and the right end of the bobbin 6, respectively. The flange portion 9 is provided between the wire winding portion 7 and the wire support portion 8 on the left, and between the wire winding portion 7 and the wire support portion 8 on the right, respectively. Each flange portion 9 is larger than the diameter of the wire winding portion 7. The wire receiving groove 10 is a groove extending from the left end to the right end of the bobbin 6.

[0054] The magnetic wire 5 is arranged inside the bobbin 6 in a manner extending linearly in the left-right direction. Specifically, the magnetic wire 5 is arranged in the wire receiving groove 10. The left end of the magnetic wire 5 is supported (fixed) at the left end of the wire receiving groove 10 formed in the wire support portion 8 on the left by a method such as bonding using an adhesive. Similarly, the right end of the magnetic wire 5 is supported (fixed) at the right end of the wire receiving groove 10 formed in the wire support portion 8 on the right. In addition, instead of the wire receiving groove 10, a hole extending from the left end to the right end of the bobbin 6, that is, a wire receiving hole, may be provided, and the magnetic wire 5 may be arranged in the wire receiving hole.

[0055] The coil 13 is disposed on the outer circumference of the magnetic wire 5 disposed in the wire receiving groove 10. Figure 5 As shown in FIG. 2 (A), the coil 13 is formed by winding an insulated electric wire 14 such as an enameled wire around the electric wire winding portion 7, for example.

[0056] Figure 6 Terminals 15 are shown. Figure 7 (A) shows a state where the wire support portion 8 on the right side of the bobbin 6 is viewed from the rear. Figure 7 (B) shows a state where the wire support portion 8 on the right side of the bobbin 6 is viewed from below. Figure 8 Shown along Figure 7 The cross section of the wire support 8 and the terminal 15 cut along the cutting line VIII-VIII in (A) is viewed from the right (at Figure 7 (A) (left) observed state.

[0057] like Figure 6 As shown, each terminal 15 is a compression terminal. In addition, compression terminals are sometimes also called spring terminals. Each terminal 15 is formed of a conductive material such as a metal material. Each terminal 15 includes a base 16, a wire connecting portion 17, a spring portion 18 and a contact portion 19.

[0058] The base 16 is formed into a plate shape that extends in the front-back, left-right and right-left directions and is long in the front-back direction. The wire connection portion 17 is a portion connected to the end of the insulated wire 14 of the coil 13 from which the insulating coating is removed. Although not shown in the figure, one end of the insulated wire 14 is connected to the wire connection portion 17 of one terminal 15 of the two terminals 15, and the other end of the insulated wire 14 is connected to the wire connection portion 17 of the other terminal 15. The wire connection portion 17 extends slightly backward from the rear end of the base 16, then bends upward, then extends upward, then bends backward, and then extends backward. The spring portion 18 is a leaf spring for displacing the contact portion 19 in the up-down direction. The spring portion 18 bends downward from the front end of the base 16, then bends backward, and then extends backward while tilting downward. The contact portion 19 is a portion that contacts the conductor portion 34 (e.g., a pad) provided on the substrate 31 when the magnetic sensor device 3 is fixed to the substrate 31. The contact portion 19 is provided at the lowermost and rearmost end of the spring portion 18. The contact portion 19 is bent upward from the end of the spring portion 18 and then slightly extends upward.

[0059] like Figure 5 As shown in (A), the two terminals 15 are respectively arranged at the lower part of the two wire support parts 8 of the winding tube 6. Specifically, as Figure 8 As shown, a terminal fixing portion 11 is provided at the lower portion of the wire support portion 8 on the right side of the bobbin 6. In addition, a terminal fixing portion 11 is also provided at the lower portion of the wire support portion 8 on the left side of the bobbin 6 in the same manner as the lower portion of the wire support portion 8 on the right side of the bobbin 6. Two terminals 15 are fixed to these terminal fixing portions 11, respectively. In the present embodiment, the terminal fixing portion 11 is a hole extending forward from the rear surface of the lower portion of each wire support portion 8, with the rear end being open and the front end being closed. In addition, a cutout 11A is formed at the lower portion of the rear side of the terminal fixing portion 11. The terminal 15 is fixed to the lower portion of the wire support portion 8 by inserting the base 16 into the terminal fixing portion 11 from the rear. In addition, as Figure 6 As shown, locking protrusions 20 are respectively provided at the left and right ends of the base 16 , and these locking protrusions 20 are respectively locked into the inner surfaces of the left and right sides of the terminal fixing portion 11 to prevent the base 16 from being separated from the terminal fixing portion 11 .

[0060] like Figure 8As shown, in a state where the base 16 of the terminal 15 is fixed in the terminal fixing portion 11, the wire connecting portion 17 protrudes rearward than the rear surface of the wire supporting portion 8. In addition, when the magnetic sensor device 3 is separated from the substrate 31, the front end portion of the spring portion 18 is located in the terminal fixing portion 11, but the rear portion of the spring portion 18 extends from the terminal fixing portion 11 through the cutout 11A and protrudes downward than the lower surface of the wire supporting portion 8. In addition, when the magnetic sensor device 3 is separated from the substrate 31, the contact portion 19 is located below the lower surface of the wire supporting portion 8. On the other hand, when the magnetic sensor device 3 is fixed to the substrate 31, the contact portion 19 is pressed against the upper surface of the conductor portion 34 on the substrate 31, as shown in FIG. Figure 8 As shown by the double-dashed line in the middle, the contact portion 19 is displaced upward against the elastic force of the spring portion 18. As a result, in the vertical direction, the position of the lower end of the contact portion 19 coincides with the position of the lower surface of the wire support portion 8. At this time, the contact portion 19 is pressed against the conductor portion 34 by the elastic force of the spring portion 18, and is strongly in contact with the conductor portion 34. As a result, the contact portion 19 and the conductor portion 34 are reliably electrically connected.

[0061] In addition, if Figure 7 As shown in (B), two protection parts 12 are provided at the lower part of the rear surface of each wire support part 8 of the bobbin 6. The two protection parts 12 protrude rearward respectively and are arranged side by side at intervals in the left-right direction. The upper end of the contact part 19 of the terminal 15 is arranged between the two protection parts 12. Thus, the contact part 19 is protected by the protection part 12. The protection part 12 prevents the contact part 19 from shifting to the left or right.

[0062] Fig. 9 The magnetic sensor 4 and the yoke 21 corresponding to the magnetic sensor 4 are shown as viewed from the upper right front. The yoke 21 has a function of controlling the direction of the magnetic flux of the external magnetic field. Specifically, the yoke 21 controls the direction of the magnetic flux of the magnetic field formed by the magnetic field forming component 2. Fig. 9 As shown, the yoke 21 includes two yoke pieces 21A. Each yoke piece 21A is formed of a soft magnetic material such as iron. A portion of one yoke piece 21A is arranged in front of the left portion of the magnetic sensor 4, and another portion of one yoke piece 21A is arranged above the left end portion of the magnetic sensor 4. In addition, a portion of the other yoke piece 21A is arranged in front of the right portion of the magnetic sensor 4, and another portion of the other yoke piece 21A is arranged above the right end portion of the magnetic sensor 4.

[0063] (shell)

[0064] The housing 22 is formed of a non-magnetic material such as resin. Figure 3 As shown in FIG. 2 , the housing 22 has a structure in which three sensor holding parts 23 are connected via a connecting part 24. Figure 4As shown, one magnetic sensor 4 and one yoke 21 are housed and fixed in each sensor holding portion 23. The three sensor holding portions 23 have the same shape as each other.

[0065] Fig.10 FIG. 2 shows a state where a sensor holding portion 23 in the housing 22 is viewed from an oblique lower side. For the convenience of explanation, the front (Fd), rear (Bd), upper (Ud), lower (Dd), left (Ld), and right (Rd) directions of the sensor holding portion 23 are shown in FIG. Fig.10 It is defined as indicated by the arrow drawn in the lower right corner.

[0066] like Fig.10 As shown, a sensor receiving hole 25 is formed in the sensor holding portion 23. The magnetic sensor 4 is received in the sensor receiving hole 25. The sensor receiving hole 25 is formed on the lower surface of the sensor holding portion 23, is open downward, and is closed at the top. The opening shape of the sensor receiving hole 25 is a quadrilateral corresponding to the shape and size of the magnetic sensor 4, so that the magnetic sensor 4 can be just inserted into the sensor receiving hole 25. The left-right dimension of the sensor receiving hole 25 is substantially equal to the left-right dimension of the magnetic sensor 4, and the front-to-back dimension of the sensor receiving hole 25 is substantially equal to the front-to-back dimension of each wire support portion 8 of the bobbin 6 of the magnetic sensor 4 except the protective portion 12.

[0067] In addition, cutouts 26 are formed at the left rear and right rear portions of the sensor holding portion 23. When the magnetic sensor 4 is inserted into the sensor receiving hole 25, the two protection portions 12 provided at the rear portion of the wire support portion 8 on the left side of the bobbin 6 of the magnetic sensor 4 and a portion of the terminal 15 are arranged inside the cutout 26 on the left side, and the two protection portions 12 provided at the rear portion of the wire support portion 8 on the right side of the bobbin 6 of the magnetic sensor 4 and a portion of the terminal 15 are arranged inside the cutout 26 on the right side.

[0068] In addition, a plurality of protrusions 27 protruding forward are formed on the rear surface of the sensor receiving hole 25. When the magnetic sensor 4 is inserted into the sensor receiving hole 25, each protrusion 27 strongly abuts against the bobbin 6. As a result, the magnetic sensor 4 is fixed in the sensor receiving hole 25. When installing the magnetic sensor 4 in the sensor holding portion 23, the staff presses the magnetic sensor 4 into the sensor receiving hole 25. In addition, when the magnetic sensor 4 is inserted deep into the sensor receiving hole 25 and the magnetic sensor 4 is installed in the sensor holding portion 23, the lower surface of the bobbin 6 of the magnetic sensor 4 (the lower surface of each wire support portion 8) and the lower surface of the sensor holding portion 23, that is, the lower surface of the housing 22 are arranged in the same plane.

[0069] In addition, in this embodiment, the three yokes 21 are integrated with the housing 22 by insert molding. Figure 4 As shown, three yokes 21 are respectively embedded in three sensor holding portions 23. In each sensor holding portion 23, the yoke 21 is located in front of the sensor receiving hole 25.

[0070] like Figure 3 As shown, for the three sensor holders 23, their front parts are connected by the connecting part 24 to be integrated. In addition, for the three sensor holders 23, they are arranged in a manner that their lower surfaces are located in the same plane. In addition, when the housing 22 is observed from above, the three sensor holders 23 are arranged around the reference line Q at intervals of 120 degrees with the reference line Q as the center. In addition, the three sensor holders 23 are arranged in a manner that the front parts of each are facing the reference line Q. In addition, the three sensor holders 23 are arranged in a manner that the distances between the sensor holders 23 and the reference line Q are equal to each other. In addition, when observed from above, the housing 22 has a rotationally symmetrical (three-dimensionally symmetrical) shape with the reference line Q as the center.

[0071] In addition, the connecting portion 24 is formed in a cylindrical shape, and the center of the connecting portion 24 is located on the reference line Q. In addition, the inner diameter of the connecting portion 24 is set to a value larger than the outer diameter of the magnetic field forming member 2. In addition, in the present embodiment, the diameter of the shaft insertion hole 32 of the substrate 31 is set to a value larger than the outer diameter of the magnetic field forming member 2, and the inner diameter of the connecting portion 24 is set to the same value as the diameter of the shaft insertion hole 32 (refer to Figure 1 and Figure 2 ).

[0072] In addition, if Figure 3 As shown, the housing 22 is provided with a plurality of sensor fixing portions 28 for fixing the housing 22 (magnetic sensor device 3) to the substrate 31 using fixing parts. In the present embodiment, the fixing parts are bolts 29 and nuts 30. In the housing 22 of the present embodiment, three sensor fixing portions 28 are arranged on the outer peripheral side portion of the housing 22 around the reference line Q at intervals of 120 degrees from the center of the reference line Q. Each sensor fixing portion 28 is arranged between two sensor holding portions 23 adjacent to each other in the circumferential direction. Each sensor fixing portion 28 is formed in a plate shape and is integrated with two sensor holding portions 23 adjacent to each other. In addition, as shown in Figure 4 As shown, the lower surface of each sensor fixing portion 28 is located in the same plane as the lower surfaces of the three sensor holding portions 23 (the lower surface of the housing 22 ).

[0073] In addition, a bolt insertion hole 28A is provided in each sensor fixing portion 28. Figure 3As shown in FIG. 1 , the outer peripheral portion of the substrate 31 is provided with three sensor fixing holes 33, which is the same number as the sensor fixing portion 28. In the substrate 31, the positions of the three sensor fixing holes 33 are set so as to coincide with the positions of the bolt insertion holes 28A of the three sensor fixing portions 28 when the housing 22 and the substrate 31 are arranged so that the center of the housing 22 (the position through which the reference line Q passes) and the center of the shaft insertion hole 32 of the substrate 31 coincide with each other.

[0074] The magnetic sensor device 3 is fixed to the substrate 31 by inserting the bolts 29 into the bolt insertion holes 28A of the sensor fixing parts 28 and the corresponding sensor fixing holes 33, and tightening the nuts 30 to the distal ends of the bolts 29. In addition, the diameter of each sensor fixing hole 33 is set to a value slightly larger than the diameter of the shaft of the bolt 29 so that the position of the magnetic sensor device 3 relative to the substrate 31 can be adjusted.

[0075] (Configuration of magnetic sensor etc. in the housing)

[0076] Fig.11 The arrangement of the three magnetic sensors 4 and the three yokes 21 in the housing 22 is shown as viewed from above. Fig.12 The configuration of the three magnetic sensors 4 and the three yokes 21 in the housing 22 is shown as viewed from above. Fig.11 and Fig.12 In FIG. 1 , S represents a reference surface located in the same plane as the lower surface of the housing 22. For the convenience of illustration, the reference surface S is given a lattice pattern.

[0077] like Fig.11 and Fig.12 As shown, in the housing 22, three magnetic sensors 4 are arranged on a reference plane S located in the same plane as the lower surface of the housing 22. Specifically, the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 is placed on the reference plane S. In addition, in the housing 22, the three magnetic sensors 4 are arranged at intervals of 120 degrees around a reference line Q orthogonal to the reference plane S. In addition, in the housing 22, the three magnetic sensors 4 are arranged in a manner that the extension direction of the magnetic wire 5 is parallel to the reference plane S. In addition, in the present embodiment, the three magnetic sensors 4 are arranged in the housing 22 so that when the housing 22 is viewed from above, the central portion in the extension direction of the magnetic wire 5 (strictly speaking, the central portion in the extension direction of the central axis of the magnetic wire 5) is tangent to the reference circle C. The reference circle C is a circle drawn on the reference plane S and whose center is located on the reference line Q. The three magnetic sensors 4 are arranged so that their front portions face the reference line Q and the distances between the magnetic sensors 4 and the reference line Q are equal to each other. When the three magnetic sensors 4 are mounted in the three sensor receiving holes 25 of the housing 22 , the three magnetic sensors 4 are arranged in this manner.

[0078] In addition, in the housing 22, three yokes are arranged on the inner circumference of the three magnetic sensors 4 arranged around the reference line Q in a manner adjacent to the three magnetic sensors 4, respectively. Specifically, the three yokes 21 are arranged on the reference plane S at intervals of 120 degrees in a manner such that their front portions face the reference line Q and the distances between the yokes 21 and the reference line Q are equal to each other. The three yokes 21 are embedded in the housing 22 in such a manner as to be arranged in this way.

[0079] (Installation of substrate and magnetic sensor device)

[0080] In order to form the rotation detection device 1 , the method of mounting the substrate 31 and the magnetic sensor device 3 on the housing 41 of the motor is as follows.

[0081] First, electric and electronic components other than the magnetic sensor device 3 are soldered to the mounting surface 31A of the substrate 31 or the like.

[0082] Next, the substrate 31 to which the electric and electronic components other than the magnetic sensor device 3 are welded is arranged on the outer peripheral side of the rotating shaft 40. At this time, the substrate 31 is arranged so that the center of the shaft insertion hole 32 of the substrate 31 coincides with the rotation center of the rotating shaft 40. Then, the substrate 31 is attached to the housing 41 of the motor via the bracket 42 and fixed.

[0083] Next, the magnetic sensor device 3 in which the three yokes 21 are embedded in the housing 22 and the three magnetic sensors 4 are respectively accommodated in the three sensor accommodation holes 25 of the housing 22 is mounted on the mounting surface 31A of the substrate 31 and fixed.

[0084] When the magnetic sensor device 3 is mounted on the mounting surface 31A of the substrate 31 and fixed, first, the position of the magnetic sensor device 3 relative to the rotating shaft 40 is determined. Specifically, the lower surface of the housing 22 and the mounting surface 31A of the substrate 31 are placed in parallel with each other, and the position of the magnetic sensor device 3 is determined so that the reference line Q of the housing 22 coincides with the rotation axis X of the rotating shaft 40. In addition, at this time, the position of the magnetic sensor device 3 is determined so that the positions of the bolt insertion holes 28A of the three sensor fixing parts 28 of the housing 22 coincide with the positions of the three sensor fixing holes 33 of the substrate 31. These positioning can be easily performed using, for example, a positioning device equipped with an imaging unit and an image processing unit, or a dedicated jig.

[0085] Fig.13 (A)~ Fig.13 (D) shows a method of positioning the magnetic sensor device 3 using a dedicated fixture. Fig.13As shown in (A), the jig 45 is made for positioning the magnetic sensor device 3. The lower surface of the jig 45 is formed with recesses 45A and 45B, which are configured to align the reference line Q of the housing 22 with the rotation axis X of the rotation axis 40 and the upper portion of each of the magnetic sensor device 3 and the rotation axis 40. When performing the above positioning, Fig.13 As shown in (B), the upper portion of the magnetic sensor device 3 is inserted into the recess 45A of the jig 45. Then, as Fig.13 (C) and Fig.13 As shown in (D), the jig 45 with the upper part of the magnetic sensor device 3 inserted is placed from above the rotating shaft 40 to the upper end of the rotating shaft 40. The recess 45B of the jig 45 is formed by profiling the upper end of the rotating shaft 40, and by placing the jig 45 on the upper end of the rotating shaft 40, the upper end of the rotating shaft 40 is just inserted into the recess 45B, thereby determining the position of the jig 45 relative to the rotating shaft 40. As a result, the position of the magnetic sensor device 3 inserted in the jig 45 relative to the rotating shaft 40 is determined.

[0086] After the magnetic sensor device 3 is positioned, the bolt 29 is inserted into the bolt insertion hole 28A of each sensor fixing portion 28 and the corresponding sensor fixing hole 33, and the nut 30 is fastened to the tip of each bolt 29. By fastening the nut 30 to each bolt 29, the magnetic sensor device 3 is fixed to the mounting surface 31A of the substrate 31, and as a result, the three magnetic sensors 4 and the three yokes 21 are fixed to the mounting surface 31A of the substrate 31. In this state, the lower surface of the housing 22 is in contact with the mounting surface 31A of the substrate 31. In addition, the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 is in contact with the mounting surface 31A of the substrate 31. In addition, the contact portion 19 of each terminal 15 of each magnetic sensor 4 is in contact with the conductor portion 34 of the substrate 31, and the contact portion 19 is pressed against the conductor portion 34, the spring portion 18 is elastically deformed, and the contact portion 19 is displaced upward. As a result, the contact portion 19 strongly abuts against the conductor portion 34 , and the contact portion 19 and the conductor portion 34 are reliably electrically connected.

[0087] By mounting the housing 22 on the mounting surface 31A of the substrate 31, as shown in FIG. Figure 1 and Figure 2 As shown, the magnetic field forming member 2 is arranged inside the connecting portion 24 of the housing 22 in a state where it does not contact the connecting portion 24. Fig.11 The position of the reference plane S shown in the figure becomes the same as the position of the mounting surface 31A, and the three magnetic sensors 4 and the three yokes 21 are arranged on the outer peripheral side of the magnetic field forming member 2 on the mounting surface 31A of the substrate 31 in a state where the positional relationship between them formed on the reference plane S is maintained. Figure 1 and Figure 2As shown, three magnetic sensors 4 are arranged on the mounting surface 31A of the substrate 31. The three magnetic sensors 4 are arranged on the outer peripheral side of the magnetic field forming component 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming component 2. In addition, each magnetic sensor 4 is arranged in a manner that the extension direction of the magnetic wire 5 becomes parallel to the mounting surface 31A of the substrate 31. In addition, when the mounting surface 31A of the substrate 31 is observed from above, each magnetic sensor 4 is arranged in a manner that the central part of the extension direction of the magnetic wire 5 (strictly speaking, the central part in the extension direction of the central axis of the magnetic wire 5) is tangent to the circle D drawn on the outer peripheral side of the magnetic field forming component 2 with the rotation center of the rotating shaft 40 as the center. When the mounting surface 31A of the substrate 31 on which the housing 22 is mounted is observed from above, the circle D coincides with the reference circle C. In addition, three yokes 21 are arranged on the mounting surface 31A of the substrate. The three yokes 21 are arranged on the outer peripheral side of the magnetic field forming component 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming component 2. In addition, each yoke 21 is arranged adjacent to the magnetic sensor 4 on the inner circumferential side of the magnetic sensor 4. In this way, the predetermined positional relationship among the magnetic field forming member 2 for detecting the rotation of the rotating shaft 40, the three magnetic sensors 4, and the three yokes 21 can be determined at once simply by mounting the housing 22 on the mounting surface 31A of the substrate 31.

[0088] (Magnetic field detection operation of magnetic sensors, etc.)

[0089] Fig.14 (A) shows the positional relationship among the magnetic field forming member 2, three magnetic sensors 4 and three magnetic yokes 21 when the magnetic sensor device 3 is disposed on the substrate 31. Fig.14 The magnetic field detection operation of the magnetic sensor 4 and the yoke 21 will be described with reference to one magnetic sensor 4 and one yoke 21 arranged on the upper side among the three magnetic sensors 4 and the three yokes 21 in (A).

[0090] exist Fig.14 In (A), the S pole of the magnetic field forming component 2 is close to the left front of the upper magnetic sensor 4, and the N pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. If the rotating shaft 40 is rotated 90 degrees clockwise from this state, Fig.14 As shown in (B), the N pole of the magnetic field forming component 2 is close to the left front of the magnetic sensor 4, and the S pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. At this time, the direction of the magnetic field of the magnetic wire 5 acting on the magnetic sensor 4 becomes right. As a result, the magnetization direction of the magnetic wire 5, which was in the left direction just before, is rapidly reversed to the right direction. As a result, Fig.14 As shown in (D) of FIG. 1 , a current pulse P1 in a positive direction, for example, is generated in the coil 13 .

[0091] Thereafter, if the rotating shaft 40 is further rotated 90 degrees clockwise, Fig.14 As shown in (C), the S pole of the magnetic field forming component 2 is close to the left front of the magnetic sensor 4, and the N pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. At this time, the direction of the magnetic field of the magnetic wire 5 acting on the magnetic sensor 4 becomes the left direction. As a result, the magnetization direction of the magnetic wire 5, which was right-directed just before, is rapidly reversed to the left direction. As a result, Fig.14 As shown in (D), a current pulse P2 in a negative direction, for example, is generated in the coil 13 .

[0092] One end of the insulated wire 14 forming the coil 13 is connected to, for example, a detection circuit provided on the substrate 31 via one terminal 15 of the magnetic sensor 4 and one conductor portion 34 provided on the mounting surface 31A of the substrate 31. In addition, the other end of the insulated wire 14 forming the coil 13 is connected to the above-mentioned detection circuit via another terminal 15 of the magnetic sensor 4 and another conductor portion 34 provided on the mounting surface 31A of the substrate 31. With this structure, the current pulses P1 and P2 generated by the coil 13 are output as pulse signals to the above-mentioned detection circuit.

[0093] The detection circuit detects the rotation amount and rotation direction of the rotating shaft 40 based on the pulse signals respectively output from the coils 13 of the three magnetic sensors 4 disposed on the mounting surface 31A of the substrate 31. As a method for detecting the rotation amount and rotation direction of the rotating shaft 40 in the rotation detection device 1, for example, the method described in International Publication No. 2016 / 002437 can be used.

[0094] In order to increase the level of the current pulse generated by the coil 13 or to make the waveform of the current pulse sharp, it is preferable to concentrate the magnetic flux of the magnetic field formed by the two magnetic poles of the magnetic field forming member 2 near the left front and right front of the magnetic sensor 4 on the magnetic line 5. Fig.14 (B) or Fig.14 As shown in (C), a yoke 21 is arranged between the magnetic sensor 4 and the magnetic field forming member 2. The yoke 21 controls the direction of the magnetic flux so that the magnetic flux of the magnetic field formed by the two magnetic poles of the magnetic field forming member 2 near the left front and right front of the magnetic sensor 4 is concentrated on the magnetic line 5. Fig.14 (B) and Fig.14 Arrow F in (C) indicates the flow of magnetic flux whose direction is controlled by yoke 21. Magnetic flux is concentrated on magnetic wire 5 by yoke 21, so that magnetic flux flows along the extending direction of magnetic wire 5 and magnetic flux passes through magnetic wire 5 reliably.

[0095] As described above, the magnetic sensor device 3 according to the embodiment of the present invention includes: the housing 22, the three magnetic sensors 4 are fixed at predetermined positions for detecting the rotation of the rotating shaft 40; and the sensor fixing portion 28, the housing 22 is fixed to the substrate 31 using the fixing parts (bolts 29 and nuts 39), and each terminal 15 of each magnetic sensor 4 is a compression terminal. According to the magnetic sensor device 3 having such a structure, when the substrate 31 and the magnetic sensor device 3 are mounted on the housing 41 of the motor to form the rotation detection device 1, each magnetic sensor 4 can be easily arranged on the substrate 31 in such a manner that the position of each magnetic sensor 4 relative to the rotating shaft 40 is respectively a designed position.

[0096] That is, each terminal 15 of each magnetic sensor 4 is a compression terminal, and the housing 22 is fixed to the substrate 31 through the sensor fixing portion 28 and the fixing member, so that each terminal 15 is pressed against the conductor portion 34 of the substrate 31 and is electrically connected to the conductor portion 34. Therefore, welding is not required in the connection between each terminal 15 and the conductor portion 34. In addition, the housing 22 is fixed to the substrate 31 through the sensor fixing portion 28 and the fixing member, so that each magnetic sensor 4 is fixed to the substrate 31, and therefore welding for fixing the housing 22 and each magnetic sensor 4 to the substrate 31 is also not required. In the prior art, it is necessary to weld the terminals of the magnetic sensors to the pads of the substrate, so after the magnetic sensors are welded to the substrate and mounted on the substrate, the substrate on which the magnetic sensors are mounted must be mounted to the rotation detection device. In contrast, in the embodiment of the present invention, welding for electrically connecting the terminals 15 of the magnetic sensors 4 to the conductors 34 of the substrate 31 is not required, and welding for fixing the housing 22 and the magnetic sensors 4 to the substrate 31 is not required, so the substrate 31 without the magnetic sensor device 3 mounted thereon can be mounted to the housing 41 of the motor. Therefore, in the embodiment of the present invention, after the substrate 31 is mounted to the housing 41 of the motor, the magnetic sensor device 3 can be mounted on the substrate 31, and when the magnetic sensor device 3 is mounted on the substrate 31, the magnetic sensor device 3 can be positioned relative to the rotating shaft 40. According to the embodiment of the present invention, the housing 22 and the magnetic sensors 4 are not welded to the substrate 31, so during welding, the positions of the housing 22 and the magnetic sensors 4 relative to the substrate 31 do not deviate from the designed positions. Furthermore, according to the embodiment of the present invention, after the substrate 31 is mounted on the housing 41 of the motor, the magnetic sensor device 3 is mounted on the substrate 31. When the magnetic sensor device 3 is mounted on the substrate 31, the magnetic sensor device 3 can be positioned relative to the rotating shaft 40. Therefore, even if the substrate 31 is displaced relative to the housing 41 when the substrate 31 is mounted on the motor housing 41, the position of the magnetic sensor device 3 relative to the substrate 31 can be adjusted when the magnetic sensor device 3 is mounted on the substrate 31, thereby absorbing the positional deviation of the substrate 31 relative to the housing 41. That is, even if the substrate 31 is displaced relative to the housing 41, the magnetic sensor device 3 can be arranged so that the position of the magnetic sensor device 3 relative to the rotating shaft 40 is the designed position. That is, even if the substrate 31 is displaced relative to the housing 41, each magnetic sensor 4 can be arranged so that the position of each magnetic sensor 4 relative to the rotating shaft 40 is the designed position.

[0097] In addition, according to the magnetic sensor device 3 of the embodiment of the present invention, even after the magnetic sensor device 3 is fixed to the substrate 31, the position of the magnetic sensor device 3 can be easily adjusted by loosening or removing the fixing part. In addition, the magnetic sensor device 3 can be removed from the motor and reinstalled on the motor without removing the substrate 31 from the housing 41.

[0098] In addition, in the magnetic sensor device 3 of the embodiment of the present invention, the three magnetic sensors 4 are accommodated in the housing 22, and the three magnetic sensors 4 are arranged and fixed at a predetermined position for detecting the rotation of the rotating shaft 40 in the housing 22. That is, in the housing 22, the three magnetic sensors 4 are arranged on the same reference plane S as the lower surface of the housing 22, at intervals of 120 degrees in the circumferential direction around the reference line Q orthogonal to the reference plane S, and the extension direction of the magnetic line 5 is parallel to the reference plane S. Therefore, only by mounting the housing 22 on the substrate 31, the predetermined positional relationship between the magnetic field forming component 2 for detecting the rotation of the rotating shaft 40 and the three magnetic sensors 4 can be determined at once and with high accuracy. As a result, for example, compared with the case where the position of the magnetic sensor 4 relative to the rotating shaft 40 is determined independently for each magnetic sensor 4, the three magnetic sensors 4 can be easily and correctly mounted on the substrate 31.

[0099] Furthermore, in the magnetic sensor device 3 according to the embodiment of the present invention, in addition to the three magnetic sensors 4, the three yokes 21 are also accommodated in the housing 22, and the three magnetic sensors 4 and the three yokes 21 are arranged and fixed at predetermined positions for detecting the rotation of the rotating shaft 40 in the housing 22. Therefore, only by attaching the housing 22 to the substrate 31, the predetermined positional relationship among the magnetic field forming member 2, the three magnetic sensors 4, and the three yokes 21 for detecting the rotation of the rotating shaft 40 can be determined at once and with high accuracy.

[0100] In the above embodiment, the case where three magnetic sensors 4 are arranged at intervals of 120 degrees in the housing 22 of the magnetic sensor device 3 and three yokes 21 are arranged at intervals of 120 degrees is given as an example, but the arrangement of the three magnetic sensors 4 and the arrangement of the three yokes 21 are not limited to this. Fig.15 As shown, three magnetic sensors 4 may be arranged at 60 degree intervals in the housing 52 of the magnetic sensor device 51 and three yokes 21 may be arranged at 60 degree intervals. In this case, a plurality of sensor fixing portions 53 are provided in the housing 52 and bolt insertion holes 53A are provided in each sensor fixing portion 53 .

[0101] In the above embodiment, the case where the three magnetic sensors 4 are arranged in the housing 22 such that the central portion of the magnetic line 5 in the extending direction is tangent to the reference circle C when the housing 22 is viewed from above is given as an example, but the present invention is not limited to this. Fig.16 As shown, the three magnetic sensors 4 can also be configured so that the magnetic lines 5 of each magnetic sensor 4 intersect with the circumference of the reference circle C. In addition, in the case of this configuration, the configuration of the magnetic field forming component (the magnetic pole or magnet for forming the rotating magnetic field) in the rotation detection device also becomes different. For the configuration of the magnetic field forming component, refer to Japanese Patent Gazette No. 2019-200098. In addition, in the configuration of the multiple magnetic sensors in the magnetic sensor device of the present invention, other methods can also be used.

[0102] In addition, in the above embodiment, the case where the reference plane S is a surface located in the same plane as the lower surface of the housing 22 is given as an example, but the present invention is not limited to this. The reference plane S may be set to a surface that is parallel to the lower surface of the housing 22 and is located above or below the lower surface of the housing 22. In this case, in order to ensure the stability of the fixation of the magnetic sensor device 3 on the mounting surface 31A of the substrate 31 and the contact between each terminal 15 and the conductor portion 34, the height position of the lower surface of each sensor fixing portion 28 or the height position of the contact portion 19 of each terminal 15 is adjusted.

[0103] In addition, the number of magnetic sensors provided in the housing of the magnetic sensor device of the present invention is not limited to three, and may be one, two, or four or more. The same is true for the magnetic yoke. For example, Fig.17 The magnetic sensor device 61 shown in the figure has a magnetic sensor 4 and a yoke 21 composed of two yoke pieces 21A housed in a housing 62. Sensor fixing parts 63 are provided at both ends of the housing 62, and each sensor fixing part 63 has a bolt insertion hole 63A.

[0104] In addition, a structure in which a yoke is not provided in the housing of the magnetic sensor device of the present invention may be adopted. Also, as the magnetic sensor device of the present invention, a structure without a housing may also be considered. For example, Fig.18 As shown, the magnetic sensor device 71 may be composed of the magnetic sensor 4 and the sensor fixing parts 72 provided at both ends of the bobbin 6 of the magnetic sensor 4 .

[0105] In addition, the fixing means for fixing the magnetic sensor or the housing to the substrate is not limited to bolts and nuts, and may be, for example, rivets, clips, etc. In addition, the present invention can also be used for purposes other than detecting the rotation of the rotating shaft.

[0106] In addition, in the present invention, the terminals of the magnetic sensor are not limited to Figure 6 Terminal 15 is shown. Instead of terminal 15, for example, Fig.19The terminal 81 shown in FIG. The terminal 81 is a compression terminal, and includes a base 82, a wire connection portion 83, two spring portions 84, and two contact portions 85. The base 82 is formed into a plate-like shape that expands in the front-back, left-right, and front-back directions and is long in the front-back direction. In addition, the front end side portion of the base 82 extends rearward after being bent downward by 180 degrees. The wire connection portion 83 extends rearward from the rear end portion of the upper side of the base 82. Each spring portion 84 extends rearward while tilting downward from the end of the front end side portion of the base 82 bent by 180 degrees, that is, from the rear end portion of the lower side of the base 82. Of the two spring portions 84, one spring portion 84 extends from the left end portion of the rear end portion of the lower side of the base 82, and the other spring portion 84 extends from the right end portion of the rear end portion of the lower side of the base 82. The contact portion 85 is provided at the lowermost and rearmost end portion of each spring portion 84. In addition, each contact portion 85 bends upward from the end portion of the spring portion 84. In addition, a locking protrusion 86 is provided at the left end and the right end of the base 82. The terminal 81 has two spring portions 84 and two contact portions 85, and the two contact portions 85 are respectively in contact with one conductor portion 34 provided on the substrate 31. That is, the terminal 81 has two contact points relative to one conductor portion 34. In addition, the two spring portions 84 can be elastically deformed independently, so the two contact portions 85 can be displaced independently in the up and down directions. According to the terminal 81 having such a structure, the reliability of the contact with respect to the conductor portion 34 can be improved.

[0107] The present invention can be modified appropriately within the scope of the claims and the entire specification without departing from the gist or concept of the invention, and the magnetic sensor device accompanying such modification is also included in the technical concept of the present invention.

Claims

1. A magnetic sensor device, characterized in that: have: A magnetic sensor comprising: a magnetic wire that exerts a large Barkhausen effect, a bobbin in which the magnetic wire is disposed, a coil formed by winding an electric wire around the bobbin, and two terminals provided on the bobbin and used to electrically connect one end and the other end of the electric wire to two conductors provided on a substrate, respectively; and A sensor fixing part, which uses a fixing member to fix the magnetic sensor to the substrate, The two terminals are compression terminals, respectively. The magnetic sensor is fixed to the substrate via the sensor fixing portion and the fixing member, so that the two terminals are pressed against the two conductor portions and are electrically connected to the two conductor portions.

2. The magnetic sensor device according to claim 1, characterized in that A yoke for controlling the direction of magnetic flux of an external magnetic field and a housing for accommodating the magnetic sensor and the yoke are provided. The sensor fixing portion is arranged on the housing.

3. The magnetic sensor device according to claim 1, characterized in that A plurality of the magnetic sensors and a housing for accommodating the plurality of magnetic sensors are provided. The plurality of magnetic sensors are arranged on a reference plane identical to or parallel to the lower surface of the housing at predetermined intervals in the circumferential direction around a reference line orthogonal to the reference plane and in such a manner that the extending direction of the magnetic lines is parallel to the reference plane.

4. The magnetic sensor device according to claim 3, characterized in that A plurality of magnetic yokes are provided to control the direction of the magnetic flux of the external magnetic field. The plurality of magnetic yokes are arranged in a one-to-one correspondence with the plurality of magnetic sensors, The plurality of yokes are accommodated in the housing together with the plurality of magnetic sensors.

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