JP2014147172A - Method of manufacturing motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a motor in which concentricity of bearings provided in a pair of end frames on both sides of a stator core in the axial direction can be ensured by suppressing inclination of the stator core.SOLUTION: A method of manufacturing a motor includes an arrangement step for arranging first and second frames 11, 12, respectively, on both sides of a stator core 17 in the axial direction, so that the bottom surfaces 24a, 25a at the fitting parts 24, 25 of the first and second frames 11, 12 abut, respectively, against both end faces of a stator core 17 in the axial direction, a press step for pressing the pressed surfaces 26, 27 of the first and second frames 11, 12 to the stator core 17 in the axial direction, by means of first and second pressing surfaces 54, 55 parallel with each other, following to the arrangement step, and a coupling step for coupling the first and second frames 11, 12 each other in the way of the press step.

Description

  The present invention relates to a method for manufacturing a motor.

  Conventionally, as shown in Patent Document 1, for example, there is a motor including a first end frame and a second end frame that are assembled on both sides in the axial direction of the stator and sandwich the stator in the axial direction. The stator includes a stator core obtained by stacking a plurality of core sheets punched from a steel plate in the axial direction of the rotating shaft and integrally forming by caulking or the like, and a winding wound around the teeth of the stator core. . The end frames are connected to each other by, for example, fastening through bolts with the stator core sandwiched from both sides in the axial direction. Thereby, each end frame is integrally configured with the stator core sandwiched in the axial direction. Further, the rotation shaft of the rotor disposed inside the stator is rotatably supported by bearings assembled to the first and second end frames.

JP-A-11-146616

  By the way, in the assembly of the motor as described above, the end frames are fastened and fixed with through bolts or the like in a state where the first and second end frames are arranged on both sides in the axial direction of the stator core. Here, since the stator core has a laminated structure of a plurality of core sheets, the parallelism of both axial end surfaces (core sheets at both axial ends) of the stator core due to variations in dimensions (thickness, flatness, etc.) of each core sheet. Difficult to keep. And if the parallelism of the axial direction both end surfaces of a stator core will deteriorate, one end frame will be in the state inclined with respect to the other end frame. For this reason, with the motors described above, it is difficult to ensure the coaxiality of the bearings supported by each end frame, and the smoothness of the rotor is hindered by the deterioration of the coaxiality of the bearings, resulting in noise and vibration. Will occur.

  The present invention has been made to solve the above-described problems, and its object is to suppress the inclination of the stator core and ensure the coaxiality of the bearings provided on the pair of end frames on both sides in the axial direction of the stator core. An object of the present invention is to provide a method for manufacturing a motor that can be used.

  A method of manufacturing a motor that solves the above problems includes a stator having an annular stator core, first and second end frames that are assembled to each other on both sides in the axial direction of the stator and connected to each other, and each end frame. A rotating shaft rotatably supported by a provided bearing; and a rotor fixed to the rotating shaft so as to rotate integrally with the rotating shaft at an inner peripheral side position of the stator core, the stator core being stacked in an axial direction of the rotating shaft A method of manufacturing a motor comprising a plurality of plate-like core sheets, wherein the first and second end frames each have a planar core holding surface perpendicular to the axis of the rotating shaft, and the core A pressed surface that is parallel to the holding surface, and the core holding surfaces of the first and second end frames are aligned with both axial end surfaces of the stator core. An arrangement step of arranging the first and second end frames on both sides in the axial direction of the stator core so as to contact each other, and a first pressure surface and a second pressure surface parallel to each other after the arrangement step A pressurizing step of pressurizing the pressurized surfaces of the first and second end frames to the stator core side in the axial direction with the first and second pressurization surfaces using a pressurizing jig; and A connecting step of connecting the first and second end frames to each other midway or after the pressurizing step.

  According to this manufacturing method, each end frame is pressed toward the stator core while maintaining the parallelism of the core holding surface, so that the stator core has parallelism between axial end surfaces (core sheets at both axial ends). It is integrated in a state where is maintained. Accordingly, since the parallelism of the first and second end frames that respectively contact the both axial end surfaces of the stator core is maintained, it is possible to ensure the coaxiality of the bearings supported by the first and second end frames. It becomes possible. As a result, it is possible to suppress noise and vibration caused by the rotor shaft misalignment.

  In the motor manufacturing method, in the arranging step, an inner peripheral surface or an outer peripheral surface of the stator core is used as a core-side centering reference surface, and the core-side centering reference surface and a centering reference surface of the first end frame are used. The stator core and the first end frame are assembled to each other in a state of being centered by using the center core, and then the centering reference surface of the integrally assembled product of the stator core and the first end frame and the second end frame. Preferably, the integrated assembly and the second end frame are centered using a centering reference surface.

  According to this manufacturing method, the axial displacement of each end frame and the stator core in the direction perpendicular to the axis can be suppressed, and the coaxiality of the bearings supported by the first and second end frames can be further improved.

  In the motor manufacturing method, the stator core and the first end frame are fixed to each other in a centered state, and then the stator core and the first end frame integrated assembly and the second end frame It is preferable to perform centering.

  According to this manufacturing method, since the stator core and the first end frame are once fixed in the centered state, the axial deviation between the stator core and the first end frame can be more reliably suppressed.

In the motor manufacturing method, the stator core and the first end frame are preferably fixed by caulking.
According to this manufacturing method, the stator core and the first end frame can be fixed with a simple configuration, which can contribute to simplification of the manufacturing method.

  In the motor manufacturing method, the centering reference surface of the integrally assembled product is an outer peripheral surface of the stator core, and the centering reference surface of the second end frame is fitted into the axial end of the stator core. It is preferable that the inner peripheral surface of the fitting portion.

  According to this manufacturing method, centering (positioning) of the integrally assembled product (stator core and first end frame) and the second end frame is possible by fitting the stator core into the fitting portion of the second end frame. It becomes.

  In the motor manufacturing method, the core-side centering reference surface is an inner peripheral surface of the stator core, and the centering reference surface of the first end frame is a bearing housing that houses the bearing in the first end frame. The inner peripheral surface of the part is preferable.

  According to this manufacturing method, the inner peripheral surfaces of the stator core and the first end frame are used as centering reference surfaces, thereby suppressing an increase in the size of the centering jig used for centering the stator core and the first end frame. Is possible.

  In the motor manufacturing method, in the centering of the stator core and the first end frame, an inner peripheral surface of the stator core that is the core-side centering reference surface, and a centering reference surface on the first end frame side. In the centering of the stator core and the integrally assembled assembly of the first end frame and the second end frame, a first centering jig for positioning the outer peripheral surface of the first end frame is used. It is preferable to use a second centering jig for positioning the outer peripheral surface of the one end frame and the centering reference surface of the second end frame.

  According to this manufacturing method, since the second centering jig is used for centering the stator core and the first assembly of the first end frame and the second end frame, the stator core and the second end frame are fitted together. Higher fitting accuracy is not required than when centering. This facilitates the assembly of the integrally assembled product and the second end frame.

  In the motor manufacturing method, in the centering of the stator core and the first end frame, an outer peripheral surface of the stator core, which is the core side centering reference surface, and a centering reference surface on the first end frame side. A first centering jig for positioning the inner peripheral surface of the bearing housing portion is used, and the outer periphery of the stator core is centered between the integrated assembly of the stator core and the first end frame and the second end frame. It is preferable to use a second centering jig for positioning the surface and the centering reference surface of the second end frame.

  According to this manufacturing method, since the second centering jig is used for centering the stator core and the first assembly of the first end frame and the second end frame, the stator core and the second end frame are fitted together. Higher fitting accuracy is not required than when centering. This facilitates the assembly of the integrally assembled product and the second end frame.

  In the motor manufacturing method, in the centering of the stator core and the first end frame, an outer peripheral surface of the stator core, which is the core side centering reference surface, and a centering reference surface on the first end frame side. Using a centering jig that positions the outer peripheral surface of the first end frame, the centering jig holds the centering assembly state of the stator core and the first end frame, while maintaining the outer periphery of the stator core. It is preferable that the integral assembly and the second end frame are centered using a surface and a centering reference surface of the second end frame.

  According to this manufacturing method, since the centering assembly state of the stator core and the first end frame is held by the centering jig, it is necessary to fix the stator core and the first end frame to each other after the centering. As a result, the manufacturing process can be simplified.

In the motor manufacturing method, it is preferable that in the connecting step, the first end frame and the second end frame are connected to each other with a through bolt.
According to this manufacturing method, the first and second end frames can be easily fixed by fastening the through bolts, which can contribute to simplification of the manufacturing method.

  According to the motor manufacturing method of the present invention, the inclination of the stator core can be suppressed, and the coaxiality of the bearings provided on the pair of end frames on both sides in the axial direction of the stator core can be ensured.

It is sectional drawing which shows schematic structure of the motor of embodiment. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of the form. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of the form. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example. It is sectional drawing for demonstrating the assembly | attachment aspect of the motor of another example.

Hereinafter, an embodiment of a motor manufacturing method will be described.
As shown in FIG. 1, the motor 10 of this embodiment includes an annular stator 13 formed by a first end frame 11 and a second end frame 12 (hereinafter simply referred to as a first frame 11 and a second frame 12). It is configured to be sandwiched in the direction of the rotation axis. Ball bearings B1 and B2 are provided on the first and second frames 11 and 12 so as to be coaxial with each other, and a rotating shaft 15 of the rotor 14 is pivotally supported on each of the ball bearings B1 and B2. . A frame that holds the axially opposite output side (the upper side in FIG. 1) of the motor 10 is referred to as a first frame 11, and a frame that holds the axially output side is referred to as a second frame 12. The frames 11 and 12 are fastened and fixed by through bolts 16 at positions on the outer peripheral side of the stator 13 so as not to be separated from each other.

  The stator 13 has an annular stator core 17. A plurality of teeth 18 extending radially inward are formed on the stator core 17, and coils 19 are wound around the teeth 18. The stator core 17 is formed by laminating a plurality of core sheets 17a formed by punching a steel plate by press working in the axial direction and integrating them. The core sheets 17a at both ends in the axial direction of the stator core 17 have an L-shaped cross section in which the radially inner ends of the teeth 18 are bent outward in the axial direction. Accordingly, the axial length of the radially inner end surface 18a (the surface facing the rotor 14) of the teeth 18 is ensured while the stack thickness of the stator core 17 (the thickness of the laminated core sheets 17a as a whole) is kept small. Is possible.

  Each frame 11 and 12 is formed with metal materials, such as aluminum and steel. Each of the frames 11 and 12 includes a substantially disc-shaped main body portion 21 and a cylindrical stator holding portion 22 that extends from the main body portion 21 along the axial direction of the rotary shaft 15.

  Fitting portions 24 and 25 into which the axial end portions of the stator core 17 are fitted are formed at the distal end portions (axially inner end portions) of the stator holding portions 22 of the first and second frames 11 and 12, respectively. . Each of the fitting portions 24 and 25 is a portion formed by reducing the thickness in the radial direction by increasing the inner diameter of the tip portion of the stator holding portion 22, and has an annular shape. The bottom surfaces 24 a and 25 a (axial end surfaces) of the fitting portions 24 and 25 have a planar shape orthogonal to the axis of the rotary shaft 15, and the bottom surfaces 24 a and 25 a are axial end surfaces of the stator core 17 ( It is in axial contact with the core sheet 17a) at the axial end.

  Pressurized surfaces 26 and 27 that are pressurized in the axial direction during assembly, which will be described later, are formed on the axially outer end surfaces of the main body portions 21 of the frames 11 and 12. Each of the pressurized surfaces 26 and 27 has a planar shape orthogonal to the axis of the rotating shaft 15. Further, a stepped portion 28 that protrudes outward in the axial direction from the pressurized surface 27 is formed on the axially outer end surface of the second frame 12.

  Further, a plurality of bolt fastening portions 21 a (only two are shown in FIG. 1) extending outward from the outer shape of the stator 13 are extended and formed on the main body portion 21 of each frame 11, 12. Bolt fastening portions 21 a are connected and fixed to each other by through bolts 16. Accordingly, the frames 11 and 12 are fixed in a state where the stator 13 is sandwiched by the stator holding portion 22.

  A bearing housing portion 31 is formed at the central portion of the main body portion 21 of the first frame 11 so that the ball bearing B1 can be assembled from the stator 13 side (motor internal side) in the rotation axis direction. The bearing housing portion 31 has a circular shape when viewed in the axial direction, and a pressing portion 32 having a through-hole 32 a having a smaller diameter than the bearing housing portion 31 is formed in a portion of the bearing housing portion 31 outside the motor. A wave washer 33 is provided between the pressing portion 32 and the ball bearing B1 accommodated in the bearing accommodating portion 31 to apply pressure to the ball bearing B1 toward the axial stator 13 side.

  A bearing housing portion 34 that houses the ball bearing B <b> 2 is formed at the center of the main body portion 21 of the second frame 12. The bearing housing portion 34 has a shape that is recessed from the axially outer end surface of the second frame 12 toward the motor inner side (stator 13 side). In other words, the bearing housing portion 34 is configured such that the ball bearing B2 can be assembled from the motor external side (anti-stator side). In addition, a positioning bottom portion 35 that is in axial contact with the ball bearing B2 is formed at the end of the bearing housing portion 34 on the motor inner side. The positioning bottom portion 35 abuts on the ball bearing B2 in the axial direction to determine the position of the ball bearing B2 in the axial direction.

  The rotor 14 includes a rotating shaft 15 supported by the ball bearings B1 and B2, a cylindrical rotor core 41 fixed to the rotating shaft 15 so as to be integrally rotatable, and a plurality of magnets fixed to the outer peripheral surface of the rotor core 41. 45. Each magnet 45 faces the inner peripheral surface of the stator core 17 (the radially inner end surface 18a of the tooth 18) in the radial direction. The distal end portion (lower end portion in FIG. 1) of the rotating shaft 15 protrudes from the ball bearing B2 to the outside of the motor, and a joint (not shown) as an output portion is attached to the protruding portion.

Next, the manufacturing method of the motor 10 of this embodiment is demonstrated.
In the assembly of the motor 10 according to the present embodiment, first, an arrangement process is performed in which the first and second frames 11 and 12 are arranged on both sides of the stator core 17 in the axial direction.

  In the placement step, first, as shown in FIG. 2, the stator core 17 and the first frame 11 around which the coil 19 is wound are assembled while being centered. At this time, in the stator core 17, the inner peripheral surface (the radially inner end surface 18a of the teeth 18) is used as a centering reference surface, and in the first frame 11, the inner peripheral surface of the bearing housing portion 31 is used as the centering reference surface. To do. Then, the stator core 17 is extrapolated to the large diameter portion 52 of the cored bar 51 as a centering jig, and the inner peripheral surface of the stator core 17 is brought into contact with the outer peripheral surface of the large diameter portion 52. Thereafter, the bearing housing portion 31 of the first frame 11 is extrapolated to the small-diameter portion 53 of the core metal 51, and the first frame 11 is fitted while the inner peripheral surface of the bearing housing portion 31 is brought into contact with the outer peripheral surface of the small-diameter portion 53. The joint portion 24 is fitted on one end of the stator core 17 in the axial direction. At this time, the bottom surface 24a of the fitting portion 24 is in contact with the one axial end surface of the stator core 17 in the axial direction. In this way, the stator core 17 and the first frame 11 are centered (positioned) by the cored bar 51 that abuts on the inner peripheral surfaces of the stator core 17 and the bearing accommodating portion 31. In addition, the diameter of the inner peripheral surface of the fitting portion 24 is set to a dimension with a slight margin with respect to the outer peripheral surface 17b of the stator core 17. In the present embodiment, centering is performed by bringing the large-diameter portion 52 and the small-diameter portion 53 of the cored bar 51 into contact with the inner peripheral surface of the stator core 17 and the inner peripheral surface of the bearing housing portion 31, respectively. However, it is not always necessary to abut them for centering. For example, the large-diameter portion 52 and the small-diameter portion 53 of the cored bar 51 may be configured to face the inner peripheral surface of the stator core 17 and the inner peripheral surface of the bearing housing portion 31 with a very small gap, respectively. Thereby, it is possible to center the stator core 17 and the first frame 11.

  After that, by caulking from the outer side in the axial direction at a plurality of locations in the circumferential direction of the fitting portion 24, the caulked location is plastically deformed inward on the inner peripheral side and is pressed against the outer peripheral surface 17 b of the stator core 17. Thereby, the stator core 17 is fixed with respect to the fitting part 24, and the integral assembly X of the stator core 17 and the 1st flame | frame 11 is comprised.

  Next, the ball bearing B2 is fixed to the bearing housing portion 34 of the second frame 12, and then the rotating shaft 15 of the rotor 14 is assembled to the ball bearing B2. Further, the other ball bearing B1 is assembled in the vicinity of the opposite end portion of the rotary shaft 15 on the output side. In addition, the assembly | attachment to the rotating shaft 15 of the ball bearing B1 does not necessarily need to be performed at this process, and may be performed in advance.

  Next, the ball bearing B <b> 1 is fixed to the bearing housing portion 31 of the first frame 11, and then assembled with the ball bearing B <b> 1 while the rotating shaft 15 of the rotor 14 is inserted inside the stator core 17.

  Next, the integrally assembled product X of the stator core 17 and the first frame 11 fixed to each other in the above process and the second frame 12 are assembled. In this step, the end of the stator core 17 on the side opposite to the first frame in the axial direction is fitted into the fitting portion 25 of the second frame 12, and the axial end surface of the stator core 17 extends in the axial direction with the bottom surface 25 a of the fitting portion 25. Abutted. In addition, the fitting accuracy of the inner peripheral surface of the fitting portion 25 of the second frame 12 is increased by cutting. By fitting the outer peripheral surface 17b of the stator core 17 to the fitting portion 25, the stator core 17 ( The center assembly X) and the second frame 12 can be centered. That is, the centering reference surface of the integrally assembled product X is the outer peripheral surface 17 b of the stator core 17, and the centering reference surface of the second frame 12 is the inner peripheral surface of the fitting portion 25. Before assembling the integrally assembled product X and the second frame 12, the wave washer 33 is accommodated in the bearing accommodating portion 31 of the first frame 11 (or the wave washer 33 is extrapolated to the rotating shaft 15. It is placed on the upper side (on the opposite side of the stator) of the ball bearing B1).

  After the above placement step, as shown in FIG. 3, the pressing step is performed using a pressing jig 56 having a first pressing surface 54 and a second pressing surface 55 that are parallel to each other. In the present embodiment, the second pressure surface 55 is provided on the fixed table 57 side (lower side in FIG. 3) of the pressure jig 56, and the first pressure surface 54 is on the movable pressure part 58 side (FIG. 3). In the upper side). In this step, the first and second pressure surfaces 54 and 55 are arranged so as to be orthogonal to the axis of the rotating shaft 15 and are in close contact with the pressure-receiving surfaces 26 and 27 of the first and second frames 11 and 12. Abut. Then, the pressed surface 26 of the first frame 11 is pressed toward the stator core 17 by the first pressing surface 54. At this time, the frames 11 and 12 are pressed toward the stator core 17 in a state where the parallelism of the bottom surfaces 24a and 25a of the fitting portions 24 and 25 orthogonal to the axis of the rotating shaft 15 is maintained. Thereby, the stator core 17 is pressurized so that it may be pinched | interposed from the axial direction both sides by each bottom face 24a, 25a orthogonal to the axis line of the rotating shaft 15. FIG.

  In addition, the first and second frames 11 and 12 are attached to the through bolts 16 in a state where the pressurized surfaces 26 and 27 of the first and second frames 11 and 12 are pressed by the first and second pressing surfaces 54 and 55. Are connected and fixed to each other (connection step). Thereby, each frame 11 and 12 and the stator core 17 are assembled | attached integrally.

Next, the operation of this embodiment will be described.
In the assembling method of the present embodiment, the bottom surfaces 24a and 25a of the fitting portions 24 and 25 perpendicular to the axis of the rotating shaft 15 are in contact with the both axial end surfaces of the stator core 17 in the axial direction. The 12 pressurized surfaces 26 and 27 are pressurized toward the stator core 17 by the first and second pressure surfaces 54 and 55 that are parallel to each other. Thereby, the stator core 17 is integrated in a state in which the parallelism of both axial end surfaces (core sheets 17a at both axial ends) is maintained, and the parallelism of the frames 11 and 12 is also maintained. For this reason, it becomes possible to ensure the coaxiality of the ball bearings B1 and B2 supported by the first and second frames 11 and 12, and as a result, it is possible to suppress noise and vibration caused by the axis deviation of the rotor 14. Is possible.

  In the assembling method of this embodiment, the frames 11 and 12 are connected and fixed to each other by the through bolts 16 while the frames 11 and 12 are pressed by the first and second pressing surfaces 54 and 55. This makes it possible to integrate the frames 11 and 12 and the stator core 17 in a state where the parallelism of the frames 11 and 12 is more reliably maintained, and the coaxiality of the ball bearings B1 and B2 is more reliably ensured. It is possible to secure.

  In the present embodiment, since the cored bar 51 is used for centering the first frame 11 and the stator core 17, high accuracy is not required for the fitting between the fitting portion 24 of the first frame 11 and the stator core 17. For this reason, it is not necessary to perform cutting or the like for obtaining high accuracy on the fitting portion 24, and as a result, it is possible to contribute to simplification of the manufacturing process.

Next, characteristic effects of the present embodiment will be described.
(1) Each of the first and second frames 11 and 12 has bottom surfaces 24a and 25a (core holding surfaces) of the fitting portions 24 and 25 having a planar shape perpendicular to the axis of the rotating shaft 15, and the bottom surfaces 24a and 25a. The pressed surfaces 26 and 27 have a planar shape parallel to the surface. In the manufacturing method of the present embodiment, the first and second frames 11 and 12 are connected to the shaft of the stator core 17 so that the bottom surfaces 24a and 25a of the fitting portions 24 and 25 are in contact with both axial end surfaces of the stator core 17, respectively. The placement step of placing the first and second frames 11 and 12 in the axial direction with the first and second pressure surfaces 54 and 55 parallel to each other after the placement step and the placement step, respectively. A pressurizing step for pressurizing the stator core 17 and a connecting step for connecting the first and second frames 11 and 12 to each other during the pressurizing step are provided. According to this manufacturing method, each of the frames 11 and 12 is pressurized toward the stator core 17 while maintaining the parallelism of the bottom surfaces 24a and 25a of the fitting portions 24 and 25, so that the stator core 17 has both axial ends. The surfaces (core sheets 17a at both ends in the axial direction) are integrated in a state where the parallelism is maintained. Accordingly, since the parallelism of the first and second frames 11 and 12 that are in contact with both axial end surfaces of the stator core 17 is maintained, the ball bearings B1 and B1 supported by the first and second frames 11 and 12 are maintained. It becomes possible to ensure the coaxiality of B2. As a result, it is possible to suppress the inclination of the stator core 17 and to suppress noise and vibration caused by the axis deviation of the rotor 14.

  (2) In the arrangement step, the inner peripheral surface of the stator core 17 (the radially inner end surface 18a of the teeth 18) is used as a core-side centering reference surface, and the inner peripheral surface of the stator core 17 and the centering reference on the first frame 11 side. The stator core 17 and the first frame 11 are assembled to each other in a state where centering is performed using the inner peripheral surface of the bearing housing portion 31 that is a surface. Thereafter, the one end portion in the axial direction of the stator core 17 in the integrally assembled product X is fitted into the fitting portion 25 of the second frame 12, whereby the integral assembled product X and the second frame 12 are centered. According to this manufacturing method, axial misalignment between the frames 11 and 12 and the stator core 17 can be suppressed, and the coaxiality of the ball bearings B1 and B2 supported by the first and second frames 11 and 12 can be reduced. It can be improved further.

  Further, in the centering of the stator core 17 and the first frame 11, each centering reference surface is set to the inner peripheral surface, so that the inner peripheral surface of the stator core 17 and the inner peripheral surface of the bearing housing portion 31 are fitted. The cored bar 51 to be used can be used as a centering jig, and as a result, an increase in the size of the centering jig can be suppressed. Further, in the centering of the integrally assembled product X and the second frame 12, it is only necessary to fit (internally fit) one axial end of the stator core 17 to the fitting portion 25 of the second frame 12. Can contribute to simplification of the process.

  (3) The stator core 17 and the first frame 11 are fixed to each other in the centered state, and then the integrated assembly X of the stator core 17 and the first frame 11 and the second frame 12 are centered. According to this manufacturing method, since the stator core 17 and the first frame 11 are once fixed in the centered state, the axial deviation between the stator core 17 and the first frame 11 can be more reliably suppressed. Furthermore, since the stator core 17 and the first frame 11 are fixed by caulking, the stator core 17 and the first frame 11 can be fixed with a simple configuration, which can contribute to simplification of the manufacturing method.

  (4) In the connecting step, the first and second frames 11 and 12 are connected to each other by the through bolts 16. Therefore, the first and second frames 11 and 12 can be easily fixed by fastening the through bolts 16, and as a result. This can contribute to simplification of the manufacturing method.

In addition, you may change the said embodiment as follows.
The method of centering the stator core 17 and the first frame 11 and the centering of the integrally assembled product X and the second frame 12 are not limited to the above-described embodiment. For example, FIGS. A method as shown in FIG.

  In the method shown in FIG. 4, when the stator core 17 and the first frame 11 are centered, the inner peripheral surface of the stator core 17 (the radially inner end surface 18 a of the teeth 18) is used as the core-side centering reference surface, and the first frame 11 side. In FIG. 2, a part of the outer peripheral surface 11a of the main body 21 is used as a centering reference surface. Then, centering is performed using a first centering jig 61 that positions each centering reference surface.

  The first centering jig 61 is a cored bar portion 61a that is fitted to the inner peripheral surface of the stator core 17 from the side opposite to the first frame, and similarly extends from the side opposite to the first frame in the axial direction to the first frame. 11 and a positioning portion 61b for positioning the outer peripheral surface 11a of the main body portion 21. The cored bar 61a positions the inner peripheral surface of the stator core 17 by contacting the inner peripheral surface of the stator core 17 in the radial direction or facing the radial direction with a very small gap. And the positioning part 61b positions this outer peripheral surface 11a by contact | abutting in the radial direction with respect to the outer peripheral surface 11a of the main-body part 21 of the 1st flame | frame 11, or having a very slight clearance. The cored portion 61a and the positioning portion 61b center the stator core 17 and the first frame 11. The stator core 17 and the first frame 11 are caulked and fixed in the centered state, as in the above embodiment.

  Thereafter, as shown in FIG. 5, the second core 12 is centered between the stator core 17 and the integrally assembled product X of the first frame 11 and the second frame 12. In the centering of the integrally assembled product X and the second frame 12, the centering reference surface of the integrally assembled product X is the outer peripheral surface 11a of the first frame 11, and the centering reference surface on the second frame 12 side is the centering reference surface. The outer peripheral surface of the step portion 28 is used.

  The second centering jig 62 includes a positioning portion 62 a for positioning the outer peripheral surface 11 a of the first frame 11 and a fitting recess 57 a provided on the fixing base 57 of the pressure jig 56. The positioning part 62a positions the outer peripheral surface 11a by contacting the outer peripheral surface 11a of the first frame 11 in the radial direction or facing the outer peripheral surface 11a with a very small gap. Then, the stepped portion 28 of the second frame 12 is fitted into the fitting recess 57a and positioned in the radial direction (abutting or facing with a very small gap), so that the integrated assembly X and the second Centering with the frame 12 is performed.

  In this state, similarly to the above-described embodiment, the pressurized surfaces 26 and 27 of the first and second frames 11 and 12 are pressed in the axial direction by the first and second pressing surfaces 54 and 55 of the pressing jig 56. In addition, the first and second frames 11 and 12 are connected and fixed to each other by the through bolts 16.

  Also by such a manufacturing method, substantially the same effect as the above embodiment can be obtained. Further, since the second centering jig 62 is used for centering the integrated assembly X and the second frame 12, the centering is performed by fitting the stator core 17 and the second frame 12 as in the above embodiment. High fitting accuracy is not required compared to the case of doing. Therefore, the assembly of the integrally assembled product X and the second frame 12 is facilitated.

  In the method shown in FIG. 6, when the stator core 17 and the first frame 11 are centered, the outer peripheral surface 17 b of the stator core 17 is used as a core-side centering reference surface, and the inner side of the bearing housing portion 31 is formed on the first frame 11 side. The peripheral surface is the centering reference surface. Then, centering is performed using a first centering jig 71 that positions each centering reference surface.

  The first centering jig 71 has a cored bar part 71 a fitted into the bearing housing part 31 of the first frame 11 and a positioning part 71 b for positioning the outer peripheral surface 17 b of the stator core 17. The cored bar portion 71 a positions the inner peripheral surface of the bearing housing portion 31 by contacting the inner circumferential surface of the bearing housing portion 31 in the radial direction or facing the radial direction with a very small gap. To do. And the positioning part 71b positions this outer peripheral surface 17b by contact | abutting in the radial direction with respect to the outer peripheral surface 17b of the stator core 17, or opposing with a very slight clearance gap. The core bar 71a and the positioning part 71b center the stator core 17 and the first frame 11. The stator core 17 and the first frame 11 are caulked and fixed in the centered state, as in the above embodiment.

  Thereafter, as shown in FIG. 7, the second core 12 is centered by the second frame 12 and the integral assembly X of the stator core 17 and the first frame 11. In the centering of the integrally assembled product X and the second frame 12, the centering reference surface of the integrally assembled product X is the outer peripheral surface 17b of the stator core 17, and the centering reference surface on the second frame 12 side is the step portion 28. The outer peripheral surface.

  The second centering jig 72 includes a positioning portion 72 a for positioning the outer peripheral surface 17 b of the stator core 17 and a fitting recess 57 a provided on the fixing base 57 of the pressurizing jig 56. The positioning portion 72a positions the outer peripheral surface 17b by contacting the outer peripheral surface 17b of the stator core 17 in the radial direction or opposing the stator core 17 with a very small gap. Then, the stepped portion 28 of the second frame 12 is fitted into the fitting recess 57a and positioned in the radial direction (abutting or facing with a very small gap), so that the integrated assembly X and the second Centering with the frame 12 is performed.

  In this state, similarly to the above-described embodiment, the pressurized surfaces 26 and 27 of the first and second frames 11 and 12 are pressed in the axial direction by the first and second pressing surfaces 54 and 55 of the pressing jig 56. In addition, the first and second frames 11 and 12 are connected and fixed to each other by the through bolts 16.

  Also by such a manufacturing method, substantially the same effect as the above embodiment and the method shown in FIGS. 4 and 5 can be obtained. Further, since the outer peripheral surface 17b of the stator core 17 is used as a centering reference surface, and the outer peripheral surface 17b of the stator core 17 can easily ensure the required accuracy by pressing the core sheet 17a, FIG. As shown in FIG. 5, the manufacturing process can be simplified as compared with the case where the outer peripheral surface 11a of the first frame 11 is used as the centering reference surface. As shown in FIGS. 4 and 5, when the outer peripheral surface 11a of the first frame 11 is used as the centering reference surface, the outer peripheral surface 11a of the first frame 11 is cut to ensure the required accuracy. Is required.

  Note that the stator core 17 and the first frame 11 are centered using the first centering jig 61 shown in FIG. 4 or the first centering jig 71 shown in FIG. As described above, the stator core 17 (integrated assembly X) and the second frame 12 may be centered by fitting the stator core 17 and the fitting portion 25 of the second frame 12.

  In the method shown in FIG. 8, when the stator core 17 and the first frame 11 are centered, the outer peripheral surface 17 b of the stator core 17 is used as a core-side centering reference surface, and the outer periphery of the main body portion 21 is formed on the first frame 11 side. A part of the surface 11a is used as a centering reference surface. Then, centering is performed using a centering jig 81 that abuts on each of the centering reference surfaces (or faces the centering reference surface with a very small gap).

  The centering jig 81 extends in the axial direction from the non-stator side of the first frame 11 to position the outer peripheral surface 11a of the main body portion 21 of the first frame 11, and the first positioning portion 81a. And a second positioning portion 81b that further extends from the portion 81a to the stator core 17 side and positions the outer peripheral surface 17b of the stator core 17. The first positioning portion 81a is in contact with the outer peripheral surface 11a of the main body portion 21 of the first frame 11 in the radial direction, or is opposed to the outer peripheral surface 11a in the radial direction with a very small gap, so that the outer peripheral surface 11a is Position. The second positioning portion 81b positions the outer peripheral surface 17b by abutting in the radial direction with respect to the outer peripheral surface 17b of the stator core 17 or facing the radial direction with a very small gap. The first and second positioning portions 81 a and 81 b center the stator core 17 and the first frame 11, and the centering assembly state is held by the centering jig 81.

  Thereafter, as shown in FIG. 9, the stepped portion 28 of the second frame 12 is fitted into the fitting recess 57 a of the fixing base 57 of the pressure jig 56 constituting the centering jig 81, and the integrally assembled product X and the second frame 12 are centered.

  In this state, similarly to the above-described embodiment, the pressurized surfaces 26 and 27 of the first and second frames 11 and 12 are pressed in the axial direction by the first and second pressing surfaces 54 and 55 of the pressing jig 56. In addition, the first and second frames 11 and 12 are connected and fixed to each other by the through bolts 16.

  Also by such a manufacturing method, substantially the same effect as the above embodiment and the method shown in FIGS. 4 and 5 can be obtained. Further, since the centering assembly state of the stator core 17 and the first frame 11 is held by the centering jig 81, it is not necessary to fix them to each other after the centering of the stator core 17 and the first frame 11, As a result, the manufacturing process can be simplified.

  -In above-mentioned embodiment, although the fitting part 24 and the stator core 17 of the 1st flame | frame 11 were fixed by caulking, it is not specifically limited to this, For example, it is good also as fastening fixation with a screw, or welding fixation. .

  In the above embodiment, the second pressure surface 55 is the fixed side and the first pressure surface 54 is the movable side (pressure side). However, the present invention is not particularly limited thereto. The second pressurizing surface 55 may be the movable side, and active pressurization may be performed from the pressurizing surfaces 54 and 55.

  In the above embodiment, the stator holding portions 22 of the frames 11 and 12 are externally fitted to the stator core 17. However, for example, the stator holding portion 22 may be internally fitted to the stator core 17. .

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... 1st end frame, 11a ... Outer peripheral surface of 1st end frame (body part), 12 ... 2nd end frame, 13 ... Stator, 14 ... Rotor, 15 ... Rotary shaft, 16 ... Through bolt, DESCRIPTION OF SYMBOLS 17 ... Stator core, 17a ... Core sheet | seat, 17b ... Outer peripheral surface of a stator core, 18a ... Radial inner side end surface (core side centering reference surface), 24, 25 ... Fitting part, 24a, 25a ... Bottom face of fitting part (Core holding surface), 26, 27 ... pressurized surface, 31, 34 ... bearing housing portion, 54 ... first pressure surface, 55 ... second pressure surface, 56 ... pressure jig, 61, 71 ... first Centering jig, 62, 72, second centering jig, 81, centering jig, B1, B2, ball bearings (bearings), X, integrated assembly.

Claims (10)

A stator having an annular stator core;
A first end frame and a second end frame assembled to each other on both sides in the axial direction of the stator and connected to each other;
A rotating shaft rotatably supported by a bearing provided in each end frame;
A motor comprising a plurality of plate-shaped core sheets laminated in the axial direction of the rotary shaft, the rotor being fixed to the rotary shaft so as to be integrally rotatable at an inner peripheral side position of the stator core A method,
Each of the first and second end frames has a core holding surface having a planar shape perpendicular to the axis of the rotation axis, and a pressed surface having a flat shape parallel to the core holding surface,
An arranging step of arranging the first and second end frames on both axial sides of the stator core so that the core holding surfaces of the first and second end frames are in contact with both axial end surfaces of the stator core, respectively. ,
After the placing step, a pressure jig having a first pressure surface and a second pressure surface that are parallel to each other is used, and the surfaces to be pressed of the first and second end frames are formed by the first and second pressure surfaces. A pressurizing step of applying pressure to the stator core side in the axial direction;
A motor manufacturing method comprising: a connecting step of connecting the first and second end frames to each other during or after the pressurizing step. In the manufacturing method of the motor according to claim 1,
In the arrangement step, the inner peripheral surface or the outer peripheral surface of the stator core is used as a core-side centering reference surface, and centering is performed using the core-side centering reference surface and the centering reference surface of the first end frame. In the state, the stator core and the first end frame are assembled together,
Thereafter, using the centering reference surface of the integrally assembled product of the stator core and the first end frame and the centering reference surface of the second end frame, the core of the integrally assembled product and the second end frame is used. A method for manufacturing a motor, wherein In the manufacturing method of the motor according to claim 2,
Fixing the stator core and the first end frame to each other in the centering state;
Thereafter, the stator core and the first end frame integrally assembled with the second end frame are centered. In the manufacturing method of the motor according to claim 3,
The method of manufacturing a motor, wherein the stator core and the first end frame are fixed by caulking. In the manufacturing method of the motor according to claim 3 or 4,
The centering reference surface of the integrally assembled product is an outer peripheral surface of the stator core,
The method for manufacturing a motor according to claim 1, wherein the centering reference surface of the second end frame is an inner peripheral surface of a fitting portion in which an axial end portion of the stator core is fitted. In the manufacturing method of the motor according to claim 5,
The core-side centering reference surface is an inner peripheral surface of the stator core,
The method of manufacturing a motor according to claim 1, wherein the centering reference surface of the first end frame is an inner peripheral surface of a bearing housing portion that houses the bearing in the first end frame. In the manufacturing method of the motor according to claim 3 or 4,
In the centering of the stator core and the first end frame, the inner peripheral surface of the stator core that is the core-side centering reference surface and the first end frame that is the centering reference surface on the first end frame side Using a first centering jig that positions the outer peripheral surface,
In the centering of the stator core and the integrally assembled assembly of the first end frame and the second end frame, a second position for positioning the outer peripheral surface of the first end frame and the centering reference surface of the second end frame. A method for manufacturing a motor, characterized by using a centering jig. In the manufacturing method of the motor according to claim 3 or 4,
In the centering of the stator core and the first end frame, the outer peripheral surface of the stator core that is the core-side centering reference surface and the inner peripheral surface of the bearing housing portion that is the centering reference surface on the first end frame side And using a first centering jig for positioning
A second centering that positions the outer peripheral surface of the stator core and the centering reference surface of the second end frame in the centering of the stator core and the integrally assembled assembly of the first end frame and the second end frame. A method for manufacturing a motor, characterized by using a jig. In the manufacturing method of the motor according to claim 2,
In the centering of the stator core and the first end frame, the outer peripheral surface of the stator core that is the core-side centering reference surface, and the outer periphery of the first end frame that is the centering reference surface on the first end frame side Using a centering jig to position the surface,
The integrated assembly using the outer peripheral surface of the stator core and the centering reference surface of the second end frame while holding the centering assembly state of the stator core and the first end frame by the centering jig. A method for manufacturing a motor, wherein the accessory and the second end frame are centered. In the manufacturing method of the motor of any one of Claims 1-9,
In the connecting step, the first end frame and the second end frame are connected to each other with through bolts.