JP5874934B2 - Rotating electric machine - Google Patents

Description

  The disclosed embodiment relates to a rotating electrical machine.

  Patent Document 1 discloses a motor having a stator core, a stator coil wound around the stator core, and a printed circuit board to which lead wires of the stator coil are connected, and molding them with resin. In this motor, a pin header is provided between the printed circuit board and the anti-load side bracket, and an FG connection pin is fixed to the pin header. The FG connection pin has one end connected to the anti-load side bracket and the other end connected to the printed circuit board.

Japanese Patent No. 4474676

  In the above prior art motor, the mold resin is provided with a concave portion and the convex portion is provided on the anti-load side bracket, and the molding resin and the anti-load side bracket are positioned coaxially by fitting the concave portion and the convex portion. Is done. On the other hand, the FG connection pin has a structure that is press-fitted into a pin hole provided in the anti-load side bracket. Therefore, it is necessary to assemble the motor while aligning both the relative position of the fitting portion between the non-load side bracket and the mold resin and the relative position of the FG connection pin and the pin hole, and the motor assembly is automated. It became a factor to inhibit.

  The present invention has been made in view of such problems, and an object thereof is to provide a rotating electrical machine capable of facilitating automation of assembly.

In order to solve the above problems, according to one aspect of the present invention, a rotating electrical machine including a stator and a rotor, wherein a lead wire is connected to a frame provided on the outer peripheral side of the stator. A resin part provided with a connector on one end side of the frame, and one end is connected to the lead wire via the connector, and the other end protrudes to one axial side of the rotor. A conductive pin provided in the resin portion, a first bracket formed with a pin hole having an inner diameter larger than the outer diameter of the pin by a predetermined dimension formed at a position corresponding to the pin, and the pin hole; provided between the pin inserted in the pin hole, for electrically conducting the one with the pin first bracket, a conductive cylindrical member, it has a, the first bracket, the internal bearing Provided and protruded to the resin part side The resin portion has a predetermined interval for coaxial alignment between the frame and the first bracket between the outer periphery of the convex portion inserted on the first bracket side. A rotating electrical machine that is formed so as to have a circular recess is applied.

  ADVANTAGE OF THE INVENTION According to this invention, automation of the assembly of a rotary electric machine can be made easy.

It is a longitudinal section showing the whole rotary electric machine composition of this embodiment. It is a disassembled perspective view showing schematic structure of a rotary electric machine. It is sectional drawing showing the surrounding structure of a connector. It is sectional drawing showing the state before inserting the electroconductive sleeve which obtains conduction | electrical_connection with the anti-load side bracket and the earthing connection pin in a pin hole, and the state after inserting. It is sectional drawing showing the state before inserting in the pin hole of a sleeve in the case of obtaining conduction | electrical_connection with the electroconductive sleeve which provided the processus | protrusion in the outer peripheral surface, and the state after insertion. It is sectional drawing showing the state before inserting in the pin hole of a sleeve in the case of obtaining conduction | electrical_connection with the conductive sleeve which provided the screw | thread in the outer peripheral surface, and the state after insertion. It is sectional drawing showing the case where a grounding pin is bent and conduction | electrical_connection is obtained.

Hereinafter, an embodiment will be described with reference to the drawings.
<Overall configuration of rotating electrical machine>

  First, the whole structure of the rotary electric machine 1 of this embodiment is demonstrated using FIG.1 and FIG.2. FIG. 1 is an axial longitudinal sectional view of the rotating electrical machine 1, and FIG. 2 is an exploded perspective view of the rotating electrical machine 1. In FIG. 2, illustration of a resin portion 14 and the like which will be described later is omitted as appropriate. As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes a cylindrical stator 2 and a cylindrical rotor 3 that is provided on the inner side of the stator 2 so as to be opposed to each other in the radial direction. It is configured as a mold motor. The rotor 3 is fixed to the shaft 8.

  Further, the rotating electrical machine 1 has a conductive (for example, aluminum) cylindrical frame 4 provided on the outer peripheral side of the stator 2 and a conductive material that closes an opening on one axial end side (left side in FIG. 1) of the frame 4. (For example, aluminum) anti-load side bracket 5 (first bracket) and conductive (for example, aluminum) load side bracket 6 that closes the opening on the other axial end side (right side in FIG. 1) of the frame 4. (Second bracket) and a resin part 14 provided with a connector 20 to which the earth lead wire 7 (lead wire) is connected on one end side (left side in FIG. 1) of the frame 4. The connector 20 has a pin header 21.

  The frame 4 is formed of a cylindrical body having a substantially quadrangular cross section, has a circular hollow hole 4a penetrating in the axial direction at the center, and is provided with axial concave grooves 4b that are notched in four corners. An axial through-hole 4c is provided at a proximity position of each concave groove portion 4b of the frame 4, for example, at a proximity position on the clockwise side of the concave groove portion 4b when viewed from the other axial side (the right side in FIG. 2). . The anti-load side bracket 5 and the load side bracket 6 have a substantially rectangular cross section having the same shape as the frame 4, and are provided with small circular hollow holes 5a and 6a penetrating in the axial direction at the center. At the four corners of the anti-load side bracket 5 and the load side bracket 6, axial concave grooves 5 b and concave grooves 6 b corresponding to the concave grooves 4 b of the frame 4 are formed. Further, axial tap holes 5c and through-holes 6c corresponding to the through-holes 4c of the frame 4 are provided at positions close to the concave-groove portions 5b and 6b.

  The anti-load side bracket 5 and the load side bracket 6 include a bearing 10a and a bearing 10b attached inside the hollow hole 5a and the hollow hole 6a, respectively (not shown in FIG. 2). The shaft 8 is rotatably supported by the bearing 10a and the bearing 10b. The mounting portion of the bearing 10a of the anti-load side bracket 5 protrudes to the other side in the axial direction (right side in FIG. 1), and forms a circular convex portion 5d.

  The stator 2 includes an annular stator core 11 having a circular hollow hole 2a penetrating in the axial direction at the center, a stator coil 12 wound around the stator core 11, and an axial direction of the stator coil 12. And a printed circuit board 13 provided on one side (left side in FIG. 1) to which the terminal of the stator coil 12 is connected. The stator 2 is inserted into the hollow hole 4a of the frame 4 and attached by shrink fitting, bonding or the like. After the stator 2 is attached to the frame 4, the stator core 11, the stator coil 12, and the printed circuit board 13 are integrally molded with the pin header 21. Thereby, the resin part 14 is formed and the whole stator 2 is sealed by the resin part 14. Further, the pin header 21 is partially covered by the resin portion 14 so as to form an opening 24 (see FIG. 3 described later) on one side in the radial direction of the pin header 21, so that the connector 20 is formed (of the connector 20 The surrounding structure will be described later). The connector forming portion of the resin portion 14 is exposed to the outside between the frame 4 and the anti-load side bracket 5.

  A circular concave portion 14a into which the convex portion 5d of the anti-load side bracket 5 is inserted is formed on one axial side of the resin portion 14 (left side in FIG. 1). The concave portion 14a of the resin portion 14 is configured such that a predetermined radial interval d (see FIG. 3 described later) is provided between the outer periphery of the convex portion 5d of the inserted anti-load side bracket 5.

  The rotor 3 includes an annular rotor core 15 into which the shaft 8 is inserted into a hollow hole. The rotor 3 is disposed in the stator 2 so as to face the stator core 11 via a magnetic gap.

  The assembly of the rotating electrical machine 1 is generally performed as follows. First, the stator 2 is attached to the hollow hole 4 a of the frame 4. Next, the stator 2 and the pin header 21 are integrally molded with resin to form the resin portion 14. Thereafter, the rotor 3 is disposed in the hollow hole 2 a of the stator 2, and both end portions of the shaft 8 protruding from the stator 2 are supported by the bearings 10 a and 10 b of the anti-load side bracket 5 and the load side bracket 6. Then, four conductive (for example, aluminum) bolts 16 (conductive bolts) are inserted through the through-holes 6c at the four corners of the load-side bracket 6 and the through-holes 4c at the four corners of the frame 4 in this order. 5 is screwed into the tapped holes 5c at the four corners. As a result, the frame 4 and the anti-load side bracket 5 and the load side bracket 6 sandwiching the frame 4 from both sides are assembled together. Thereafter, the rotary electric machine 1 is constructed by closing the encoder chamber 17A containing the encoder 17 and the like with the lid 18.

<Surrounding structure of the connector>
The surrounding structure of the connector 20 will be described with reference to FIGS. 3 and 4. The connector 20 is formed by partially covering the pin header 21 with a resin mold (resin portion 14) so as to provide an opening 24 on one side in the radial direction of the pin header 21 (upper side in FIG. 3). The pin header 21 includes a substantially L-shaped conductive ground pin 22 integrally molded with resin. One end 22a of the ground pin 22 extends from the pin header 21 to the other side in the axial direction (right side in FIG. 3) and is connected to the printed circuit board 13. The other end 22b of the ground pin 22 extends from the pin header 21 to one side in the radial direction. It protrudes into the opening 24 of the resin part 14. The connector 7a of the ground lead wire 7 is inserted into the opening 24, and the ground lead wire 7 and the other end 22b of the ground pin 22 are connected.

  The resin portion 14 is provided with a conductive ground connection pin 23 (conductive pin) which is resin-molded integrally with the pin header 21. The ground connection pin 23 is a linear wire, and one end 23 a of the ground connection pin 23 contacts the ground pin 22 in the pin header 21 and is connected to the ground lead wire 7 via the ground pin 22. On the other hand, the other end 23b of the ground connection pin 23 extends so as to protrude to one side in the axial direction (left side in FIG. 4), and is inserted into a pin hole 25 provided so as to penetrate the anti-load side bracket 5. ing.

  The pin hole 25 has an inner diameter larger than the outer diameter of the ground connection pin 23 by a predetermined dimension. As shown in FIG. 4A, a sleeve 26 (means for conducting, a cylindrical member) is inserted into the pin hole 25. The sleeve 26 is made of a conductive material (for example, aluminum), and electrically connects the ground connection pin 23 and the anti-load side bracket 5. The sleeve 26 has an outer diameter that is substantially the same as the inner diameter of the pin hole 25 and an inner diameter that is substantially the same as the outer diameter of the ground connection pin 23. On one end side (the right side in FIG. 4A) of the sleeve 26 is formed a taper 26b in which the inner diameter of the inner peripheral surface 26a constituting the hollow portion 27 of the sleeve 26 is enlarged. The sleeve 26 is press-fitted into the pin hole 25 from the one end side from the outside of the anti-load side bracket 5 and is fixed to the pin hole 25 by an interference fit. The sleeve 26 may be fixed by adhesion. At this time, since the tapered portion 26 b is formed on the inner peripheral surface 26 a on one end side of the sleeve 26, the other end 23 b of the ground connection pin 23 can be easily inserted from the one end side of the sleeve 26.

  By inserting the sleeve 26 into the pin hole 26, as shown in FIG. 4B, the outer peripheral surface 26c of the sleeve 26 is pressed against the inner peripheral surface 25a of the pin hole 25, and the inner peripheral surface 26a of the sleeve 26 is grounded. The anti-load side bracket 5 and the ground connection pin 23 are electrically connected via the sleeve 26 in pressure contact with the outer peripheral surface 23 c of the connection pin 23. The sleeve 26 is inserted into the pin hole 26 and fixed after the anti-load side bracket 5 and the frame 4 are aligned so as to be coaxial.

<Effect of embodiment>
As described above, the rotating electrical machine 1 according to the present embodiment includes the resin portion 14 including the connector 20 to which the connector 7a of the earth lead wire 7 is connected, and the conductive ground connection pin provided on the resin portion 14. 23. One end 23 a of the ground connection pin 23 is configured to be connected to the ground lead wire 7 through the connector 20. On the other hand, the other end 23 b of the ground connection pin 23 protrudes to one side in the axial direction of the rotor 3 and is inserted into the pin hole 25 of the anti-load side bracket 5. The pin hole 25 has an inner diameter larger than the outer diameter of the ground connection pin 23 by a predetermined dimension. The ground connection pin 23 inserted into the pin hole 25 and the anti-load side bracket 5 are electrically conductive. The sleeve 26 is electrically connected. In this way, conduction between the anti-load side bracket 5 and the ground is ensured.

  Here, if the inner diameter of the pin hole 25 and the outer diameter of the ground connection pin 23 are configured to be substantially equal and the ground connection pin 23 is press-fitted into the pin hole 25, the rotating electrical machine 1 is assembled. There is a possibility that the ground connection pin 23 and the pin hole 25 may interfere with each other, which hinders assembly automation. In the present embodiment, since the inner diameter of the pin hole 25 is configured to be larger than the outer diameter of the ground connection pin 23, the pin hole 25 and the ground connection pin 23 are assembled when the rotating electrical machine 1 is assembled. The anti-load-side bracket 5 can be attached to the frame 4 (the stator 2 and the resin portion 14 are assembled) in a state where there is no interference with. Thereafter, using the gap space between the pin hole 25 and the ground connection pin 23, it is possible to perform alignment with high accuracy so that the anti-load side bracket 5 and the frame 4 are coaxial. Therefore, automation of assembly of the rotating electrical machine 1 can be facilitated.

  In the present embodiment, in particular, the anti-load side bracket 5 has a circular convex portion 5d having a bearing 10a therein, and the convex portion 5d is a circular concave portion 14a formed in the resin portion 14. Inserted into. At this time, it is assumed that the outer diameter of the convex portion 5d of the anti-load side bracket 5 and the inner diameter of the concave portion 14a of the resin portion 14 are substantially equal, and the frame 4 and the anti-load side bracket are fitted by fitting the concave portion 14a and the convex portion 5d. 5, both the relative position of the fitting portion between the concave portion 14 a and the convex portion 5 d and the relative position between the ground connection pin 23 and the pin hole 25 described above are used. It is necessary to assemble the rotating electrical machine 1 while aligning the positions, which becomes a factor that hinders assembly automation.

  In this embodiment, the recessed part 14a formed in the resin part 14 is comprised so that the predetermined space | interval d may leave between the outer periphery of the inserted convex part 5d. Thus, when the rotating electrical machine 1 is assembled, in addition to the interference between the pin hole 25 and the ground connection pin 23 described above, the frame 4 is anti-loaded in the state where there is no interference between the concave portion 14a and the convex portion 5d. A side bracket 5 can be attached. Therefore, automation of assembly of the rotating electrical machine 1 can be facilitated.

  Moreover, according to this embodiment, the following effects can also be obtained. That is, as described above, the outer diameter of the convex portion 5d of the anti-load-side bracket 5 and the inner diameter of the concave portion 14a of the resin portion 14 are configured to be substantially equal, and the frame 4 is formed by fitting the concave portion 14a and the convex portion 5d. When positioning so that the non-load-side bracket 5 is coaxial, there is a possibility that the coaxial accuracy is lowered due to a dimensional error of the concave portion 14a or the convex portion 5d. On the other hand, in this embodiment, after the anti-load side bracket 5 is attached to the frame 4, the space of the gap d between the concave portion 14 a and the convex portion 5 d (the gap space between the pin hole 25 and the ground connection pin 23 described above). In the same manner, it is possible to perform positioning with high accuracy so that the anti-load side bracket 5 and the frame 4 are coaxial by position control using, for example, a camera and image processing. Therefore, it is possible to improve the coaxial accuracy of the frame 4 and the anti-load side bracket 5 as compared with the case where positioning is performed by fitting the concave portion 14a and the convex portion 5d.

Further, in the rotary electric machine 1 of the present implementation mode, since the resin portion 14 is disposed between the anti-load side bracket 5 and the frame 4 are not electrically connected to the frame 4 and the anti-load side bracket 5. Therefore, in the present embodiment, the anti-load side bracket 5 and the load side bracket 6 are connected by sandwiching the resin portion 14 and the frame 4 with the conductive bolt 16. Thereby, the anti-load side bracket 5 and the load side bracket 6 can be conducted through the bolt 16. As a result, the stator 2 is electrically connected to the ground lead wire 7 through the frame 4, the load side bracket 6, the bolt 16, the anti-load side bracket 5, the sleeve 26, the ground connection pin 23 and the ground pin 22. In this way, conduction between the stator 2 and the earth can be ensured through the frame ground.

  In the present embodiment, in particular, as a means for electrically connecting the ground connection pin 23 inserted in the pin hole 25 and the anti-load side bracket 5, the ground connection inserted in the pin hole 25 and the pin hole 25. A conductive sleeve 26 is provided between the working pin 23. Thereby, the electrical connection between the ground connection pin 23 and the anti-load side bracket 5 can be ensured with a simple structure.

  In this embodiment, in particular, the sleeve 26 is fixed by an interference fit by being press-fitted into the pin hole 25. As a result, the sleeve 26 can be prevented from falling off from the pin hole 25 with a simple structure.

  In the present embodiment, in particular, the sleeve 26 has a tapered portion 26b on one end side where the inner diameter of the inner peripheral surface 26a is enlarged. As a result, the other end 23b of the ground connection pin 23 can be easily inserted from one end side of the sleeve 26, so that the process of fitting the sleeve 26 into the pin hole 25 can be facilitated.

<Modification>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order.

(1) Case where conduction is obtained with a sleeve having protrusions on the outer peripheral surface In the above embodiment, the sleeve 26 having no irregularities on the outer peripheral surface is used as the conductive cylindrical member, but the protrusion extending in the cylindrical axis direction is provided on the outer peripheral surface. A provided sleeve may be used. An example of this modification is shown in FIG.

  As shown in FIG. 5A, the sleeve 26A has a plurality (six in this example) of protrusions 28 extending in the cylindrical axis direction on the outer peripheral surface at equal intervals in the circumferential direction. On the other hand, the pin hole 25 </ b> A provided in the anti-load side bracket 5 has a plurality of (six in this example) concave grooves 29 extending in the axial direction on the inner peripheral surface, and the concave portions 29 are connected to the protrusions 28 of the sleeve 26. It is provided at a corresponding circumferential position. As shown in FIG. 5 (a), when the sleeve 26A is press-fitted into the pin hole 25A from one end side (the right side in FIG. 5 (a)), as shown in FIG. 5 (b), the outer peripheral surface of the sleeve 26A. The protrusions 28 fit into the grooves 29 on the inner peripheral surface of the pin hole 25A. That is, the sleeve 26A is fixed to the pin hole 25A by spline coupling. At this time, the inner peripheral surface 26 a constituting the hollow portion 27 of the sleeve 26 </ b> A is in pressure contact with the outer peripheral surface 23 c of the ground connection pin 23 inserted into the hollow portion 27. As a result, the anti-load side bracket 5 and the ground connection pin 23 are electrically connected via the sleeve 26A.

  As described above, in this modification, the sleeve 26A is fixed to the pin hole 25A by the action of the protrusion 28 of the sleeve 26A and the groove 29 of the pin hole 25A. Thereby, the fall prevention effect from the pin hole 25A of the sleeve 26A can be enhanced.

(2) Case where conduction is obtained with a sleeve provided with a screw on the outer peripheral surface In this modification, a sleeve provided with a screw on the outer peripheral surface is used as a conductive cylindrical member. An example of this modification is shown in FIG.

  As shown in FIG. 6A, the sleeve 26B has a male screw 30 formed on the outer peripheral surface thereof. On the other hand, the pin hole 25B provided in the anti-load side bracket 5 has an internal thread 31 corresponding to the external thread 30 formed on the inner peripheral surface. As shown in FIG. 6 (a), when the sleeve 26B is screwed into the pin hole 26B from one end side (right side in FIG. 6 (a)), as shown in FIG. 6 (b), the inside of the hollow portion 27 of the sleeve 26B. With the ground connection pin 23 inserted in the sleeve 26B, the sleeve 26B is fastened to the pin hole 25B. As a result, the anti-load side bracket 5 and the ground connection pin 23 are electrically connected via the sleeve 26B.

  As described above, in this modification, the male screw 30 is formed on the outer peripheral surface of the sleeve 26B, the female screw 31 is formed on the inner peripheral surface of the pin hole 25B, and the sleeve 26B is screwed into the pin hole 25B. Is fixed to the pin hole 25B. Thereby, the fall prevention effect from the pin hole 25B of the sleeve 26B can be further enhanced.

(3) When the ground connection pin is bent to obtain continuity In the present modification, as shown in FIG. 7, the other end 23b of the ground connection pin 23 extends outward from the anti-load side bracket 5, The extended other end 23 b is bent at a substantially right angle so as to come into contact with the anti-load side bracket 5. The bent portion 23b '(conducting means) formed by this bending allows the anti-load side bracket 5 and the ground connection pin 23 to be directly conducted without using another conducting means.

  According to this modification, there is no need to provide a separate member for conduction, and therefore the number of parts can be reduced. Further, the process of aligning and pushing the member is not required as in the case of fitting the member for conduction, and the process of bending the tip of the ground connection pin 23 is sufficient, so the assembly process of the rotating electrical machine 1 is further simplified. it can.

(4) When Conduction is Obtained by Solder Solder may be used as means for electrically conducting the ground connection pin 23 inserted in the pin hole 25 and the anti-load side bracket 5. This eliminates the need to align and push the member as compared with the case where the member for conduction is inserted between the pin hole 25 and the ground connection pin 23 inserted into the pin hole 25. The assembly process of the electric machine 1 can be simplified.

  Although the case where the rotating electrical machine 1 is a motor has been described as an example above, the present embodiment can also be applied to the case where the rotating electrical machine is a generator.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the above-mentioned embodiment and each modification are implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Stator 3 Rotor 4 Frame 5 Anti-load side bracket (first bracket)
5d Convex 6 Load side bracket (second bracket)
7 Ground lead wire (lead wire)
10a Bearing 14 Resin part 14a Recess 16 Bolt 20 Connector 23 Ground connection pin (conductive pin)
23a one end 23b other end 23b 'bent portion (means for conducting)
25 pin hole 26 sleeve (conducting means, cylindrical member)
26A Sleeve (conducting means, cylindrical member)
26B Sleeve (conducting means, cylindrical member)
26b Taper portion 28 Projection 29 Groove 30 Male screw 31 Female screw d Interval

Claims (6)

A rotating electric machine having a stator and a rotor,
A frame provided on the outer peripheral side of the stator;
A resin part provided on one end side of the frame with a connector to which a lead wire is connected;
One end is configured to be connected to the lead wire via the connector, and a conductive pin provided on the resin portion so that the other end protrudes on one axial side of the rotor;
A first bracket formed by penetrating a pin hole having an inner diameter larger than the outer diameter of the pin by a predetermined dimension at a position corresponding to the pin;
A conductive cylindrical member provided between the pin hole and the pin inserted into the pin hole, and electrically conducting the pin and the first bracket ;
I have a,
The first bracket is
A bearing is provided inside, and has a circular convex portion protruding toward the resin portion side,
The resin part is
On the first bracket side, there is a circular concave portion configured such that a predetermined interval for coaxial alignment between the frame and the first bracket is provided between the outer periphery of the inserted convex portion. A rotating electric machine characterized by being formed . A second bracket provided on the other end of the frame;
The rotating electrical machine according to claim 1 , further comprising a conductive bolt that connects the first bracket and the second bracket with the resin portion and the frame interposed therebetween. The cylindrical member is
The rotating electrical machine according to claim 1 , wherein the rotating electrical machine is fixed to the pin hole by an interference fit. The cylindrical member is
A protrusion extending in the cylindrical axis direction is formed on the outer peripheral surface,
The pin hole is
4. The rotating electrical machine according to claim 1 , wherein a groove in which the protrusion fits is formed on an inner peripheral surface. The cylindrical member is
External threads are formed on the outer peripheral surface,
The pin hole is
The rotating electrical machine according to claim 1 , wherein an internal thread is formed on an inner peripheral surface. The cylindrical member is
The rotating electrical machine according to any one of claims 1 to 5 , further comprising a tapered portion on one end side where an inner diameter of the inner peripheral surface is enlarged .

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