JP2012168003A - Detection stator, rotation detector, and installing structure for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable positioning of a detection stator to a motor housing, and position adjustment; and to ensure the detection accuracy of a rotation detector.SOLUTION: A motor 2 includes a rotation shaft 14, and a motor housing 11 including the rotation shaft 14. A detection rotor 7 is fixed to the rotation shaft 14 on an inside of the motor housing 11. A detection stator 6 includes a detecting portion 31 formed in a plate shape made from resin, and on which a plane coil 32 is disposed on a surface; an outer peripheral rib 34 formed along an outer peripheral edge of the detecting portion 31; and a plurality of projecting portions 34a formed on an outer peripheral surface of the outer peripheral rib 34. The detection stator 6 is disposed on the inside of the motor housing 11 so that a surface side of the detecting portion 31 is opposed to a surface side of the detection rotor 7, and fixed to the motor housing 11 by a bolt 9 from the outside of the motor housing 11 while the plurality of the projecting portions 34a of the outer peripheral rib 34 abuts on an inner wall of the motor housing 11.

Description

  The present invention relates to a detection stator, a rotation detector, and a mounting structure for the motor that are used for detecting rotation of a rotation shaft of a motor.

  Conventionally, as this type of technology, for example, a rotary transformer type resolver described in Patent Document 1 below is known. The resolver includes a fixed core, a rotating core facing the fixed core via a gap, a primary winding provided on the fixed core, and a secondary winding provided on the rotating core. A rotating transformer unit composed of the primary side winding and the secondary side winding, an excitation winding provided on the rotation side core, a detection winding provided on the fixed side core, and the excitation winding and detection A signal generation unit including windings. The resolver is fixed to the gap surface of the fixed core, and the fixed side sheet coil in which the primary winding of the rotary transformer unit and the detection winding of the signal generation unit are integrally formed, and the gap surface of the rotary side core And a rotating side sheet coil formed integrally by connecting a secondary winding of the rotating transformer unit and an exciting winding of the signal generating unit in series.

  Here, the fixed-side core is fixed to the inside of a bracket that rotatably supports the shaft, and the rotating-side core is fixed on the outer periphery of the shaft while facing the fixed-side core through a gap.

Japanese Patent Laid-Open No. 8-136211

  However, in the resolver described in Patent Document 1, the fixed side core is simply fixed inside the bracket, and the rotary side core is simply fixed on the outer periphery of the shaft. was difficult. For example, when the base material of the fixed side core or the base material of the rotation side core is made of resin, if there is a deformation such as a slight warp in the base material, the fixed side core is in an appropriate state with respect to the bracket. It becomes impossible to fix with. In this case, it is necessary to align and adjust the position of the fixed side core with respect to the bracket. However, Patent Document 1 did not disclose or suggest such alignment or position adjustment. In addition, if the positioning and position adjustment of the fixed core cannot be performed well, it affects the detection accuracy of the resolver, which may affect the productivity of the resolver.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a detection stator capable of aligning and adjusting the position of the detection stator with respect to the motor housing and ensuring the detection accuracy of the rotation detector, An object of the present invention is to provide a rotation detector and its mounting structure.

  In order to achieve the above object, the invention according to claim 1 is an attachment structure for a motor of a rotation detector having a detection stator and a detection rotor, and the motor includes a rotation shaft and a motor including the rotation shaft. Including a housing, a detection rotor is fixed to the rotating shaft inside the motor housing, a detection stator is formed in a plate shape with resin, and a planar coil is arranged on the surface, Including an outer peripheral wall portion formed along the outer peripheral edge of the detection portion and extending in the axial direction; and a plurality of convex portions formed on the outer peripheral surface of the outer peripheral wall portion; and for fixing the detection stator to the motor housing. The detection stator is disposed on the inner side of the motor housing such that the surface side of the detection portion faces the surface side of the detection rotor, and a plurality of convex portions on the outer peripheral wall portion abut against the inner wall of the motor housing. And purpose to be fixed to the motor housing by the fixing member from the outside of the motor housing state.

  According to the configuration of the invention, the detection stator is disposed inside the motor housing, and the plurality of convex portions of the outer peripheral wall are in contact with the inner wall of the motor housing. The contact area becomes smaller, and the detection stator can be easily moved with respect to the inner wall. In the detection stator, the detection portion is reinforced by the outer peripheral wall portion.

  To achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the fixing member is a plurality of tightening members, and the detection stator is tightened to the motor housing from the outside of the motor housing. And a plurality of elongated holes formed in the motor housing corresponding to the plurality of fastening members, and a plurality of fastening members integrated between the plurality of fastening members and the motor housing. The purpose of this invention is to provide a connecting member that is connected in a mechanical manner.

  According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1, in the state where the plurality of fastening members are temporarily fastened to the detection stator from the outside of the motor housing, the plurality of fastening members and the motor housing By moving the connecting member interposed between them in the range of the long hole of the motor housing, the detection stator is moved together with the plurality of fastening members.

  In order to achieve the above object, according to a third aspect of the present invention, in the first aspect of the present invention, the fixing member is a plurality of tightening members, and the detection stator is tightened to the motor housing from the outside of the motor housing. And a plurality of elongated holes formed in the motor housing corresponding to the plurality of tightening members, and an operation for adjusting the position of the detection stator with respect to the motor housing. It is intended that an engagement portion to be formed and an operation hole formed in the motor housing corresponding to the engagement portion are provided.

  According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1, in the state where a plurality of fastening members are temporarily fastened to the detection stator from the outside of the motor housing, the back surface of the detection unit is made through the operation hole of the motor housing. By operating the engaging portion, the detection stator is moved together with the plurality of fastening members within the range of the long hole of the motor housing.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the detection portion is provided with a plurality of fixing convex portions on the back surface thereof, and the outer peripheral wall. The detection stator is fixed to the motor housing by a fixing member from the outside of the motor housing at the plurality of fixing protrusions.

  According to the configuration of the invention described above, in addition to the operation of the invention according to any one of claims 1 to 3, the detection stator is provided with a plurality of fixing convex portions on the back surface of the detecting portion, and these fixing convex portions. Is fixed to the motor housing from the outside of the motor housing by a fixing member, so that the surface of the detection rotor can be parallelized or the surface side of the detection rotor can be adjusted by appropriately adjusting the degree of fixing of the fixing member to each fixing convex portion. And the distance and position are adjusted. In addition, since the fixing member is not directly involved in the detection unit, the surface of the detection unit is hardly distorted. Further, since the outer peripheral wall portion and the plurality of fixing convex portions are integrally formed continuously, the stress when the fixing member is involved in each fixing convex portion is shared between each fixing convex portion and the outer peripheral wall portion. Is done.

  In order to achieve the above object, according to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the detection portion is formed in a central portion of the through hole through which the rotation shaft passes. It is intended to include an inner peripheral wall portion that is formed along the inner peripheral edge of the through hole and extends in the axial direction.

  According to the configuration of the invention, in addition to the operation of the invention according to any one of claims 1 to 4, the detection portion of the detection stator is reinforced by the inner peripheral wall portion.

  In order to achieve the above object, the invention described in claim 6 is that, in the invention described in claim 4, the plurality of fixing convex portions are formed with cavities at positions adjacent to the detection portion. And

  According to the configuration of the above invention, in addition to the operation of the invention according to claim 4, since the plurality of fixing convex portions are formed with cavities at positions adjacent to the detecting portions, each fixing convex portion is molded. Sometimes expansion / contraction is absorbed by the cavity.

  In order to achieve the above object, the invention described in claim 7 is characterized in that, in the invention described in claim 6, ribs that divide the cavity into stripes are formed in the cavity.

  According to the configuration of the above invention, in addition to the action of the invention according to claim 6, since the striped rib is formed in the cavity, the coupling force between each fixing convex part and the detection part is formed in the cavity part. Secured.

  In order to achieve the above object, an invention according to claim 8 is a rotation detector including a detection stator and a detection rotor, and the detection rotor is fixed to the rotation shaft of the motor inside the motor housing. The detection stator is formed in a plate shape with resin, and a planar coil is disposed on the surface, and an outer peripheral wall portion formed along the outer peripheral edge of the detection portion and extending in the axial direction And a plurality of convex portions formed on the outer peripheral surface of the outer peripheral wall portion, and a fixing member for fixing the detection stator to the motor housing. The motor housing is arranged on the inner side of the motor housing so as to face the front surface side, and is fixed by a fixing member from the outside of the motor housing in a state in which the plurality of convex portions of the outer peripheral wall abut on the inner wall of the motor housing And purpose to be configured to be secured.

  According to the configuration of the invention, the rotation detector can be applied to the mounting structure according to any one of claims 1 to 7.

  In order to achieve the above object, an invention according to claim 9 is a detection stator that constitutes a rotation detector together with a detection rotor, and is formed in a plate shape with a resin, and a planar coil is arranged on the surface. And an outer peripheral wall portion formed along the outer peripheral edge of the detection portion and extending in the axial direction, and a plurality of convex portions formed on the outer peripheral surface of the outer peripheral wall portion, the surface side of the detection portion facing the detection rotor The configuration is such that the plurality of convex portions of the outer peripheral wall portion are fixed to the motor by a fixing member from the outside of the motor in a state where the plurality of convex portions are in contact with the inner wall of the motor.

  According to the configuration of the invention, the detection stator can be applied to the rotation detector according to any one of claims 1 to 8.

  According to the first aspect of the present invention, the detection stator can be positioned and adjusted with respect to the motor housing, and the detection accuracy of the rotation detector can be ensured.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to facilitate the alignment and position adjustment of the detection stator with respect to the motor housing.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, it is possible to facilitate the alignment and position adjustment of the detection stator with respect to the motor housing.

  According to the invention of claim 4, in addition to the effect of the invention of any of claims 1 to 3, the detection stator is aligned and adjusted to ensure parallelism and an accurate distance to the detection rotor. The reliability as the detection stator can be ensured, and the detection accuracy as the rotation detector can be ensured. Moreover, the stress which affects the surface of a detection part can be reduced, the reliability as a detection stator can be improved, and the detection accuracy as a rotation detector can be improved.

  According to the fifth aspect of the invention, in addition to the effect of the first aspect of the invention, the inner peripheral wall part is less likely to be distorted on the surface of the detection part, and the reliability as the detection stator can be improved. The detection accuracy as a rotation detector can be improved.

  According to the invention described in claim 6, in addition to the effect of the invention described in claim 4, the detection stator can reduce the influence of the expansion / contraction of each fixing convex portion on the detection unit, The flatness of the surface of the detector can be ensured.

  According to the invention described in claim 7, in addition to the effect of the invention described in claim 6, the integrity of each fixing convex portion and the detection portion can be secured for the detection stator.

  According to the eighth aspect of the present invention, the detection stator can be positioned and adjusted with respect to the motor housing, and the detection accuracy of the rotation detector can be ensured.

  According to the ninth aspect of the present invention, it can be suitably used for the rotation detector according to any one of the first to eighth aspects.

The front sectional view concerning a 1st embodiment which shows a rotation detector and a motor which attached it. The bottom view which concerns on the embodiment and shows the part of the accommodating part of a motor housing seeing from the lower side of FIG. The perspective view which concerns on the same embodiment and shows the detection stator and detection rotor which comprise a rotation detector from diagonally upward. The perspective view which shows the detection stator and detection rotor which concern on the same embodiment and are related to the same embodiment, and comprises a rotation detector from diagonally downward. The top view which concerns on the embodiment and shows a detection stator. The bottom view which shows the detection stator according to the embodiment. The front sectional view showing a detection stator concerning the embodiment. The right view which concerns on the same embodiment and shows a detection stator. The bottom view which concerns on 2nd Embodiment and shows the part of the accommodating part of a motor housing seeing from the lower side. The front sectional view showing a rotation detector and a motor to which it is attached according to the third embodiment. The bottom view which shows the part of the accommodating part of a motor housing concerning the embodiment, seeing from the lower side of FIG. The bottom view which shows the detection stator according to the embodiment. The bottom view which concerns on 4th Embodiment and shows a detection stator.

<First Embodiment>
Hereinafter, a detection stator, a rotation detector, and a mounting structure thereof according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front sectional view showing a rotation detector 1 and a motor 2 to which the rotation detector 1 is attached in this embodiment (hereinafter, the direction of FIG. 1 is a front view for convenience). The motor 2 includes a motor housing 11 having a substantially disk-shaped appearance, a rotary shaft 14 included in the motor housing 11 and supported rotatably via bearings 12 and 13 at the inner center thereof, A motor rotor 15 fixed on the outer periphery of the rotary shaft 14 on the inner side, and a motor stator 16 fixed on the inner side of the motor housing 11 via a gap on the outer peripheral side of the motor rotor 15 are provided. The motor stator 16 is provided with a coil 17.

  In FIG. 1, a housing portion 11 a for housing the rotation detector 1 is integrally formed below the motor housing 11. The accommodating portion 11 a is configured by a substantially annular peripheral wall with the rotating shaft 14 and the bearing 13 as the center. A communication hole 11b communicating with the outside is formed in a part of the outer periphery of the housing portion 11a.

  As shown in FIG. 1, the rotating shaft 14 of the motor 2 has a substantially cylindrical shape, and includes a large diameter portion 14a, a medium diameter portion 14b, and a small diameter portion 14c. The large diameter portion 14a is supported by one bearing 12, and the motor rotor 15 is fixed to the outer periphery thereof. The small-diameter portion 14c is supported by the other bearing 13, and the tip end portion projects outside from a shaft hole 11c formed in the bottom wall of the accommodating portion 11a.

  As shown in FIG. 1, the rotation detector 1 includes a detection stator 6 and a detection rotor 7. The detection rotor 7 is fixed to the outer periphery of the medium diameter portion 14 b of the rotating shaft 14 inside the motor housing 11. That is, the detection rotor 7 is press-fitted into the middle diameter portion 14 b of the rotating shaft 14 and is fixed by the ring-shaped stopper 8. Further, the detection stator 6 is disposed inside the housing portion 11 a of the motor housing 11 so as to face the detection rotor 7 around the rotation shaft 14, and serves as a fixing member and a fastening member from the outside of the motor housing 11. A plurality of (in this case, three) bolts 9 are fixed. Three elongated holes 11d through which the three bolts 9 are inserted are formed in the bottom wall of the accommodating portion 11a. In this embodiment, a connecting member 10 that integrally connects the three bolts 9 is interposed between the three bolts 9 and the accommodating portion 11a.

  FIG. 2 is a bottom view of the housing portion 11a of the motor housing 11 as viewed from the lower side of FIG. The connecting member 10 has a substantially annular shape, three wide seats 10a corresponding to the three bolts 9, and three round holes 10d formed corresponding to the diameters of the shafts of the three bolts 9, And a plurality of recesses 10b formed along the outer periphery thereof. The three long holes 11d formed in the accommodating portion 11a corresponding to the three bolts 9 each have an arc shape and are arranged on the same circumference around the rotation shaft 14.

  FIG. 3 is a perspective view of the detection stator 6 and the detection rotor 7 constituting the rotation detector 1 of this embodiment when viewed obliquely from above. FIG. 4 is a perspective view of the detection stator 6 and the detection rotor 7 constituting the rotation detector 1 of this embodiment when viewed obliquely from below. As shown in FIGS. 3 and 4, the detection rotor 7 includes a resin substrate 21 having an annular flat plate shape, a planar coil 22 (see FIG. 3) disposed on a surface 21 a of the resin substrate 21, and a resin substrate 21. 1 is provided on the inner periphery of the metal member 23, and is provided on the inner periphery of the metal member 23. Two protrusions 23a.

  The resin substrate 21 is formed of PPS resin or the like. The metal member 23 is formed of SUS or the like. The planar coil 22 is formed on the resin substrate 21 by printing using an ink jet or the like, and an insulating layer is formed thereon.

  As shown in FIGS. 3 and 4, the metal member 23 has a plurality of convex portions 23 b that protrude radially in the outer periphery thereof. These convex portions 23b are formed radially at equal angular intervals. The metal member 23 is insert-molded with respect to the resin substrate 21 at the outer peripheral portion including the convex portions 23b.

  As shown in FIGS. 1, 3, and 4, the detection rotor 7 is disposed such that the surface 21 a side of the resin substrate 21 faces the surface side of the detection stator 6, and the medium diameter portion 14 b of the rotating shaft 14. It is attached to the outer periphery. Here, the detection rotor 7 is prevented from coming off by the ring-shaped stopper 8 in a state where the inner periphery of the metal member 23 is press-fitted into the outer periphery of the medium diameter portion 14b of the rotary shaft 14 and positioned at the stepped portion 14d. . Further, the protrusion 23 a provided on the inner periphery of the metal member 23 engages with a key groove (not shown) formed in the medium diameter portion 14 b, and the detection rotor 7 is prevented from rotating with respect to the rotating shaft 14. In this way, the detection rotor 7 is fixed to the rotating shaft 14.

  FIG. 5 is a plan view showing the detection stator 6 of this embodiment. FIG. 6 is a bottom view of the detection stator 6 of this embodiment. FIG. 7 is a front sectional view showing the detection stator 6 of this embodiment. FIG. 8 is a right side view of the detection stator 6 of this embodiment. As shown in FIGS. 1 and 3 to 8, the detection stator 6 is formed in a substantially annular flat plate shape with resin, and a detection unit 31 in which a planar coil 32 is arranged on the front surface 31 a and a back surface of the detection unit 31. A plurality of fixing convex portions 33 provided, an outer peripheral rib 34 as an outer peripheral wall portion formed along the outer peripheral edge on the back surface side of the detection portion 31, and formed in the central portion of the detection portion 31. A through hole 31b through which the rotating shaft 14 passes, an inner peripheral rib 35 as an inner peripheral wall portion formed along the inner peripheral edge of the through hole 31b on the back side of the detection unit 31 and extending in the axial direction, and a detection unit One connector portion 36 facing in the lateral direction (horizontal direction) from 31 is provided. The outer peripheral rib 34 and the plurality of fixing convex portions 33 are formed continuously and integrally. As shown in FIGS. 5 and 6, a plurality (four in this case) of convex portions 34 a that are in contact with the inner periphery of the accommodating portion 11 a are provided on the outer periphery of the outer peripheral rib 34 of the detection stator 6. These convex portions 34 a are arranged at equiangular intervals on the outer periphery of the outer peripheral rib 34. As shown in FIG. 3, the planar coil 32 disposed on the surface 31 a of the detection unit 31 is formed by printing using an inkjet or the like, and an insulating layer is formed thereon.

  As shown in FIGS. 1 and 3 to 8, each fixing convex portion 33 has a cylindrical shape, and in this embodiment, three are arranged at equiangular intervals along the outer periphery on the back surface of the detecting portion 31. Is done. Each fixing projection 33 is provided with a metal bush 37 having a screw hole 37a as a fastening fitting. The metal bush 37 is insert-molded with respect to the fixing convex portion 33. The metal bush 37 is configured such that a bolt 9 is fastened to fix the detection stator 6 to the motor housing 11.

  As shown in FIGS. 3 to 8, each fixing convex portion 33 is formed with a cavity 38 at a position adjacent to the detection portion 31. Ribs 38a are formed in the cavities 38 to divide the cavities 38 into stripes.

  As shown in FIGS. 1 and 7, a plurality of metal terminals 39 are insert-molded in the connector portion 36. Each terminal 39 is bent at a right angle, and the first end 39 a is disposed in the connector portion 36, and the second end 39 b is disposed in the detection portion 31. A coil wire constituting the planar coil 32 is connected to each of the second end portions 39b arranged in the detection unit 31.

  Here, attachment of the detection stator 6 to the housing portion 11a of the motor housing 11 will be described. As shown in FIG. 1, the detection stator 6 is disposed inside the accommodating portion 11 a so that the surface 31 a side of the detection portion 31 faces the surface 21 a side of the resin substrate 21 of the detection rotor 7. At this time, as shown in FIGS. 5 and 6, the outer periphery of the detection stator 6 is fitted inside the accommodating portion 11 a, and a plurality of convex portions 34 a formed on the outer periphery of the outer peripheral rib 34 are formed in the accommodating portion 11 a. Contact the inner wall. In this state, each fixing convex portion 33 is disposed on the bottom wall of the accommodating portion 11a so as to be aligned with each long hole 11d. Then, the bolts 9 are inserted into the respective long holes 11d from the outside of the motor housing 11 with the connecting member 10 interposed, and the bolts 9 are fastened to the metal bushes 37 by the fixing projections 33, thereby detecting The stator 6 is fixed to the accommodating portion 11a. At this time, in a state where the three bolts 9 are loosely temporarily tightened, the position of the detection stator 6 relative to the housing portion 11a is adjusted by rotating the connecting member 10 around the rotation shaft 14 within the range of the long holes 11d. The Further, by appropriately adjusting the tightening degree of the three bolts 9, the parallelism of the surface 31 a of the detection unit 31 and the distance and position with the surface of the detection rotor 7 are adjusted.

  According to the mounting structure of the rotation detector in this embodiment described above, when the rotation detector 1 is mounted on the motor housing 11, the detection stator 6 is disposed inside the housing portion 11a of the motor housing 11, and the outer peripheral wall portion. A plurality of the convex portions 34a of 34 come into contact with the inner wall of the accommodating portion 11a. Therefore, the contact area between the inner wall of the accommodating portion 11a and the detection stator 6 is reduced, and the detection stator 6 can be easily rotated with respect to the inner wall. For this reason, before the detection stator 6 is fixed to the housing portion 11a by the plurality of bolts 9, the detection stator 6 can be rotated to align and detect the position of the detection stator 6 with respect to the motor housing 11. Thus, the detection accuracy of the rotation detector 1 can be ensured.

  Further, in this embodiment, the connecting member 10 interposed between the three bolts 9 and the receiving portion 11a is accommodated in a state where the three bolts 9 are loosely temporarily tightened to the detection stator 6 from the outside of the motor housing 11. The detection stator 6 is moved together with the three bolts 9 by rotating within the range of the long hole 11d of the portion 11a. For this reason, the alignment and position adjustment of the detection stator 6 with respect to the motor housing 11 can be facilitated. Furthermore, since a plurality of concave portions 10b are formed on the outer periphery of the connecting member 10, a jig can be engaged with the concave portions 10b, and the connecting member 10 can be easily rotated for alignment and the like. Can do.

  Furthermore, in this embodiment, the detection stator 6 is provided with three fixing convex portions 33 on the back surface of the detecting portion 31, and is fixed to the housing portion 11 a of the motor housing 11 with the bolts 9 by these fixing convex portions 33. Is done. Therefore, by adjusting the fixing degree of the bolt 9 with respect to each fixing convex portion 33 as appropriate, the parallelism of the surface 31a of the detection unit 31 and the distance and position with the surface side of the detection rotor 7 are adjusted. For this reason, it is possible to facilitate alignment and position adjustment of the detection stator 6 to ensure parallelism and an accurate distance to the detection rotor 7, and it is possible to ensure reliability as the detection stator 6. In terms of meaning, the detection accuracy as the rotation detector 1 can be ensured.

  In this embodiment, the bolts 9 are not directly involved in the surface 31a of the detection unit 31 and the bolts 9 are fastened to the fixing convex portions 33 in the detection stator 6, so that the surface 31a of the detection unit 31 is hardly distorted. . Also in this sense, reliability as the detection stator 6 can be ensured, and detection accuracy as the rotation detector 1 can be ensured.

  In this embodiment, since the outer peripheral rib 34 is formed along the outer peripheral edge of the detection stator 6 on the back surface side of the detection unit 31, the detection unit 31 is reinforced. Moreover, since the inner peripheral rib 35 is formed along the inner peripheral edge on the back surface side of the detection unit 31, the detection unit 31 is reinforced. For this reason, each of the outer peripheral ribs 34 and the inner peripheral ribs 35 hardly causes distortion on the surface 31a of the detection unit 31, and the reliability as the detection stator 6 can be improved, and the detection accuracy as the rotation detector 1 can be improved. Can be improved.

  In this embodiment, since the outer peripheral rib 34 of the detection portion 31 and the plurality of fixing projections 33 are continuously formed integrally with the detection stator 6, the stress when the bolt 9 is associated with each fixing projection 33. However, the fixing protrusions 33 and the outer peripheral ribs 34 share the same. For this reason, the stress which affects the surface of the detection part 31 can be reduced, the reliability as the detection stator 6 can be further improved, and the detection accuracy as the rotation detector 1 can be further improved. .

  In this embodiment, since a cavity 38 is formed at a position adjacent to the detection unit 31 in the plurality of fixing projections 33 for the detection stator 6, expansion / contraction when each fixing projection 33 is resin-molded. Shrinkage is absorbed by the cavity 38. For this reason, with respect to the detection stator 6, the influence of the expansion / contraction of each fixing convex portion 33 on the detection unit 31 can be reduced, and the flatness of the surface 31 a of the detection unit 31 can be ensured.

  In this embodiment, since the striped ribs 38 a are formed in the cavity 38, the coupling force between the fixing protrusions 33 and the detection unit 31 is secured at the cavity 38. For this reason, it is possible to ensure the integrity of each fixing convex portion 33 and the detection portion 31 for the detection stator 6.

  In this embodiment, since the metal bush 37 is provided on each fixing projection 33 for the detection stator 6, the coupling force between each fixing projection 33 and the bolt 9 is increased, and the metal bush 37 and the bolt 9 are connected to each other. Adjustment of the fixing force of the detection stator 6 is facilitated by the cooperation. For this reason, the detection stator 6 can be more reliably fixed to the motor housing 11, and the position adjustment work of the detection stator 6 can be facilitated.

  In this embodiment, since three detection convex portions 33 are provided on the detection unit 31 for the detection stator 6, it is difficult for torsional stress to be generated in the detection unit 31. For this reason, the flatness of the surface 31a of the detection part 31 is substantially securable. If the number of fixing projections 33 is two, it is difficult to adjust the parallelism of the detection unit 31, and if the number of fixing projections 33 is four or more, stress in the twisting direction is likely to occur in the detection unit. Become. For this reason, it can be said that the number of fixing convex portions 33 is three, even in consideration of workability.

  The detection stator 6 of this embodiment can be suitably applied to the rotation detector 1 in the above-described rotation detector mounting structure. Moreover, the rotation detector 1 of this embodiment can be suitably applied to the above-described rotation detector mounting structure.

Second Embodiment
Next, a detection stator, a rotation detector, and a mounting structure thereof according to a second embodiment of the present invention will be described in detail with reference to the drawings.

  In the following description, components equivalent to those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  This embodiment differs from the first embodiment in the configuration of the connecting member 10. In FIG. 9, the part of the accommodating part 11a of the motor housing 11 in this embodiment is shown with the bottom view seen from the lower side. That is, in this embodiment, the connecting member 10 has a substantially annular shape, and is formed corresponding to the diameters of the three wide seat portions 10 a corresponding to the three bolts 9 and the shaft portions of the three bolts 9. It includes three round holes 10d and a plurality of round holes 10c formed along the circumference thereof. Therefore, also in this embodiment, the connection member 10 can obtain the same effects as the first embodiment.

  Other functions and effects in this embodiment are basically the same as those in the first embodiment.

<Third Embodiment>
Next, a detection stator, a rotation detector, and a mounting structure thereof according to a third embodiment of the present invention will be described in detail with reference to the drawings.

  This embodiment is different from the above embodiments in terms of the configuration of the detection stator 6 and the accommodating portion 11a. FIG. 10 is a front sectional view showing the rotation detector 1 and the motor 2 to which the rotation detector 1 is attached in this embodiment. FIG. 11 is a bottom view of a portion of the accommodating portion 11a of the motor housing 11 in this embodiment as viewed from the lower side of FIG. FIG. 12 shows the detection stator 6 in a bottom view. That is, in this embodiment, the detection stator 6 is fastened to the housing portion 11a from the outside of the motor housing 11 by three bolts 9 as in the above embodiments. In addition, three elongated holes 11d are formed in the bottom wall of the accommodating portion 11a corresponding to the three bolts 9. In addition, on the back surface of the detection portion 31 of the detection stator 6, two convex portions 42 are formed as engagement portions that are operated to adjust the position of the detection stator 6 with respect to the housing portion 11 a. In addition, two operation holes 11e are formed in the bottom wall of the accommodating portion 11a corresponding to each convex portion 42. Then, a rod-shaped jig 40 is inserted into each operation hole 11e, and its tip is engaged with a convex portion 42 to operate the detection stator 6.

  Therefore, according to this embodiment, the three bolts 9 from the outside of the motor housing 11 are loosely temporarily tightened to the fixing projections 33 of the detection stator 6, and the detection unit 31 is passed through the operation holes 11e of the storage unit 11a. The detection stator 6 is moved together with the three bolts 9 in the range of the long hole 11d of the housing portion 11a by operating the convex portion 42 on the back surface of the housing 11a. For this reason, the alignment and position adjustment of the detection stator 6 with respect to the motor housing 11 can be facilitated.

  Other functions and effects in this embodiment are basically the same as those in the first embodiment.

<Fourth embodiment>
Next, a detection stator, a rotation detector, and a mounting structure thereof according to a fourth embodiment of the present invention will be described in detail with reference to the drawings.

  This embodiment differs from the third embodiment in the configuration of the detection stator 6. FIG. 13 shows the detection stator 6 in a bottom view. That is, in this embodiment, instead of the convex portion 42 of the third embodiment, a short cylindrical boss portion 41 as an engaging portion is formed on the back surface of the detecting portion 31. The rod-shaped jig 40 is inserted into the operation hole 11e, and the tip of the jig 40 is engaged with the boss portion 41 to operate the detection stator 6.

  Therefore, according to this embodiment, the three bolts 9 are loosely temporarily tightened from the outside of the motor housing 11 to the respective fixing projections 33 of the detection stator 6, and the detection portion 31 of the detection portion 31 is passed through the operation hole 11 e of the storage portion 11 a. By operating the boss portion 41 on the back surface with the jig 40, the detection stator 6 is moved together with the three bolts 9 within the range of the long hole 11d of the housing portion 11a. For this reason, the alignment and position adjustment of the detection stator 6 with respect to the motor housing 11 can be facilitated.

  Other functions and effects in this embodiment are basically the same as those in the first embodiment.

  The present invention is not limited to the above-described embodiments, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention.

  For example, in the above-described embodiment, the detection rotor 7 is fitted and fixed to the outer periphery of the rotation shaft 14, but the detection rotor may be attached to the tip of the rotation shaft.

  The present invention can be used for detecting the rotation of the rotating shaft of a motor.

DESCRIPTION OF SYMBOLS 1 Rotation detector 2 Motor 6 Detection stator 7 Detection rotor 9 Bolt (fixing member, fastening member)
DESCRIPTION OF SYMBOLS 10 Connection member 11 Motor housing 11a Accommodating part 11d Long hole 11e Operation hole 14 Rotating shaft 31 Detection part 31a Surface 31b Through-hole 32 Planar coil 33 Fixing convex part 34
34a Convex part 35 Inner peripheral rib (inner peripheral wall part)
38 Cavity 38a Rib 41 Boss part (engagement part)
42 Convex part (engagement part)

Claims (9)

An attachment structure for a motor of a rotation detector provided with a detection stator and a detection rotor,
The motor includes a rotating shaft and a motor housing containing the rotating shaft;
The detection rotor is fixed to the rotating shaft inside the motor housing;
The detection stator is formed of a resin in a plate shape, a detection portion having a planar coil disposed on a surface thereof, an outer peripheral wall portion formed along an outer peripheral edge of the detection portion and extending in the axial direction, and the outer peripheral wall portion Including a plurality of convex portions formed on the outer peripheral surface of
A fixing member for fixing the detection stator to the motor housing, and the detection stator is disposed inside the motor housing such that a surface side of the detection unit faces a surface side of the detection rotor, An attachment structure for a rotation detector, wherein the plurality of convex portions of the outer peripheral wall portion are fixed to the motor housing by the fixing member from the outside of the motor housing in a state where the convex portions are in contact with the inner wall of the motor housing. The fixing member is a plurality of fastening members, and is configured to fasten the detection stator to the motor housing from the outside of the motor housing;
A plurality of elongated holes formed in the motor housing corresponding to the plurality of tightening members;
2. The rotation detector according to claim 1, further comprising a connecting member that is interposed between the plurality of fastening members and the motor housing and integrally connects the plurality of fastening members. Mounting structure. The fixing member is a plurality of fastening members, and is configured to fasten the detection stator to the motor housing from the outside of the motor housing;
A plurality of elongated holes formed in the motor housing corresponding to the plurality of tightening members;
An engagement portion formed on the back surface of the detection portion and operated to adjust the position of the detection stator with respect to the motor housing;
The rotation detector mounting structure according to claim 1, further comprising an operation hole formed in the motor housing corresponding to the engagement portion.   The detection portion is provided with a plurality of fixing convex portions on the back surface thereof, and the outer peripheral wall portion and the plurality of fixing convex portions are continuously formed integrally, and the detection stator includes the plurality of fixing convex portions. The rotation detector mounting structure according to any one of claims 1 to 3, wherein the rotation detector is fixed to the motor housing by the fixing member from the outside of the motor housing.   The detection unit includes a through hole formed in a central portion thereof, through which the rotation shaft passes, and an inner peripheral wall portion formed along an inner peripheral edge of the through hole and extending in the axial direction. The rotation detector mounting structure according to claim 1.   The rotation detector mounting structure according to claim 4, wherein a cavity is formed at a position adjacent to the detection unit in the plurality of fixing projections.   The rotation detector mounting structure according to claim 6, wherein a rib that divides the cavity into stripes is formed in the cavity. A rotation detector comprising a detection stator and a detection rotor,
The detection rotor is configured to be fixed to the rotating shaft of the motor inside the motor housing;
The detection stator is formed of a resin in a plate shape, a detection portion having a planar coil disposed on a surface thereof, an outer peripheral wall portion formed along an outer peripheral edge of the detection portion and extending in the axial direction, and the outer peripheral wall portion Including a plurality of convex portions formed on the outer peripheral surface of
A fixing member for fixing the detection stator to the motor housing, and the detection stator is disposed inside the motor housing such that a surface side of the detection unit faces a surface side of the detection rotor, The rotation detection device is configured to be fixed to the motor housing by the fixing member from the outside of the motor housing in a state where the plurality of convex portions of the outer peripheral wall portion are in contact with the inner wall of the motor housing. vessel. A detection stator that constitutes a rotation detector together with a detection rotor,
A detection unit in which a planar coil is arranged on the surface, formed in a plate shape with resin;
An outer peripheral wall formed along the outer peripheral edge of the detection unit and extending in the axial direction;
A plurality of convex portions formed on the outer peripheral surface of the outer peripheral wall portion, and arranged such that the surface side of the detection portion faces the detection rotor, and the plurality of convex portions of the outer peripheral wall portion are inner walls of the motor A detection stator configured to be fixed to the motor by a fixing member from the outside of the motor in contact with the motor.

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