Manufacturing apparatus for rotating electric machine and manufacturing method for rotating electric machine

Abstract

To provide a manufacturing device and a manufacturing method for a rotary electric machine that are able to eliminate circumferential positional deviation of a stator without forming a positioning recess in an outer peripheral part of the stator.SOLUTION: An assembling device 30 includes: a frame fixing portion 50 for fixing circumferential positions of a first frame 12 and a second frame 13 while a stator 11 is kept sandwiched in an axial direction; and a drive roller 61 that rotates in contact with a stator outer peripheral surface 29 of the stator 11, thereby rotating the stator 11 relatively in a circumferential direction so that a circumferential position of the stator 11 with respect to the first frame 12 and the second frame 13 is a designed position.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an apparatus for manufacturing a rotating electric machine and a method for manufacturing a rotating electric machine. [Background technology]

[0002] Conventionally, as disclosed in Patent Document 1, there is known a method for manufacturing a rotating electric machine including a stator, a first frame provided on one axial side of the stator, a second frame provided on the other axial side of the stator, and through bolts for fastening the first frame and the second frame together while sandwiching the stator in the axial direction. In Patent Document 1, positioning recesses are formed on the outer peripheral surfaces of the stator, the first frame, and the second frame, respectively, and jigs are inserted into the positioning recesses to position the stator, the first frame, and the second frame in the circumferential direction, and the first frame and the second frame are fastened together using through bolts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-137964 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of products in which it is not possible to form positioning recesses on the outer circumferential surface of the stator, a circumferential misalignment occurs during assembly, in which the circumferential position of the stator relative to the first and second frames deviates from the designed position. If the first and second frames are fastened together with through bolts in a state in which a circumferential misalignment occurs, assembly defects will occur in later processes.

[0005] The present invention has been made in consideration of the above-mentioned points, and its object is to provide a manufacturing apparatus for a rotating electric machine and a manufacturing method for a rotating electric machine that can suppress circumferential misalignment of a stator without forming a positioning recess on the outer periphery of the stator. [Means for solving the problem]

[0006] The manufacturing apparatus for a rotating electric machine of the present invention includes a frame fixing portion that fixes the circumferential position of a first frame and a second frame that axially sandwich a stator, and a drive roller that rotates while in contact with the outer peripheral surface of the stator, thereby rotating the stator circumferentially relative to the first frame and the second frame so that the circumferential position of the stator relative to the first frame and the second frame is as designed.

[0007] The manufacturing method of the rotating electric machine of the present invention includes a frame fixing process for fixing the circumferential position of the first frame and the second frame which axially sandwich the stator, and a stator rotation process for rotating the stator circumferentially relative to the first frame and the second frame by rotating a drive roller which is in contact with the outer peripheral surface of the stator, so that the circumferential position of the stator relative to the first frame and the second frame becomes as designed.

[0008] By using the drive rollers to rotate the stator in the circumferential direction relative to the stator in this manner, it is possible to suppress the circumferential position shift of the stator without forming a positioning recess on the outer periphery of the stator, thereby preventing assembly failure in a later process. [Brief description of the drawings]

[0009] [Figure 1] 1 is a vertical cross-sectional view of a rotating electric machine manufactured by a manufacturing apparatus according to an embodiment; [Diagram 2] Cross-sectional view of line II-II in Figure 1. [Diagram 3] 3 is a view of the stator, the first frame, and the through bolt in FIG. 1 as viewed from the direction of arrow III. [Figure 4] FIG. [Diagram 5] Cross-sectional view of line VV in Figure 4. [Figure 6] 6 is a view of the manufacturing apparatus of FIG. 4 as seen from the direction of arrow VI. [Figure 7]FIG. 7 is an enlarged view of a portion VII in FIG. 6, illustrating a state in which the circumferential position of the stator is at a designed position. [Figure 8] FIG. 8 corresponds to FIG. 7 and shows a state in which the circumferential position of the stator is deviated from the designed position. [Figure 9] 5A to 5C are process diagrams illustrating a manufacturing method for manufacturing a rotating electric machine using the manufacturing apparatus of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a manufacturing apparatus and a manufacturing method for a rotating electrical machine will be described with reference to the drawings.

[0011] [One embodiment] First, a rotating electric machine manufactured by a manufacturing apparatus according to an embodiment will be described. As shown in Fig. 1 to Fig. 3, a motor 10 as a rotating electric machine includes a stator 11, a first frame 12 provided on one side of the stator 11 in the axial direction, a second frame 13 provided on the other side of the stator 11 in the axial direction, and through bolts 14 fastening the first frame 12 and the second frame 13 together with the stator 11 sandwiched therebetween in the axial direction.

[0012] One end of the stator 11 is fitted into a fitting portion 15 of the first frame 12. The other end of the stator 11 is fitted into a fitting portion 16 of the second frame 13. In one embodiment, two through bolts 14 are provided. The first frame 12 has a first flange portion 17 that serves as a seat for the through bolts 14. The second frame 13 has a second flange portion 18 into which the through bolts 14 are screwed.

[0013] The first frame 12 and the second frame 13 rotatably support the rotor 19. An axis O of the stator 11 coincides with the center of rotation of the rotor 19. In the following, a direction parallel to the axis O is defined as an axial direction. A direction perpendicular to the axis O is defined as a radial direction. A direction around the axis O is defined as a circumferential direction.

[0014] A control unit 21 and a cover 22 that covers the control unit 21 are provided on the opposite side of the first frame 12 to the stator 11. A through hole 23 that penetrates the first frame 12 in the axial direction is formed. A terminal wire 25 connected to the winding 24 of the stator 11 is inserted through the through hole 23 in the axial direction and connected to the control unit 21. In one embodiment, the through hole 23 is formed at two locations separated in the circumferential direction. Three terminal wires 25 are inserted through one through hole 23.

[0015] The control unit 21 is fixed to the first frame 12 using bolts. The first frame 12 is formed with screw holes 26 for bolt fixing. In one embodiment, the screw holes 26 are formed on both sides in the circumferential direction of the through hole 23. The first frame 12 has a protrusion 27 that protrudes in the radial direction. The tip of a connector 28 of the control unit 21 is exposed to the outside through an opening formed between the protrusion 27 and the cover 22.

[0016] (manufacturing equipment) Next, a description will be given of the assembly device 30 serving as a manufacturing device for the motor 10. As shown in Fig. 4 to Fig. 8, the assembly device 30 includes a conveying unit 40, a frame fixing unit 50, a driving roller unit 60, a driven roller unit 70, a roller moving unit 80, an image analysis unit 90, and a bolt tightening unit 95.

[0017] The conveying section 40 conveys the pallet 41 carried in from the previous process to a predetermined assembly position, and also carries the pallet 41 that has completed the process by the assembly device 30 to the subsequent process. The stator 11, rotor 19, first frame 12, and second frame 13 are placed on the pallet 41. The second frame 13 is positioned with respect to the pallet 41 by fitting with a positioning pin (not shown). The stator 11 and the second frame 13 are stacked such that the axis O is perpendicular to the plate-shaped pallet 41. By fitting the stator 11 with the fitting sections 15 and 16, it becomes immovable in the radial direction with respect to the first frame 12 and the second frame 13 but rotatable in the circumferential direction relative thereto.

[0018] The frame fixing parts 50 fix the circumferential positions of the first frame 12 and the second frame 13 in the assembled position with the stator 11 sandwiched in the axial direction. The frame fixing parts 50 press the pressing parts 51 into the recesses 42 of the pallet 41 to fit therein, and sandwich the pallet 41 between the pressing parts 51 and the guide parts 52, thereby fixing the pallet 41 in the assembled position. This fixes the circumferential and radial positions of the second frame 13. The frame fixing parts 50 also fix the circumferential position of the first frame 12 by sandwiching the protruding parts 27 between the pair of clamping parts 53.

[0019] The drive roller unit 60 has a drive roller 61, a support unit 62 that supports the drive roller 61 rotatably around a central axis parallel to the axis O, a transmission mechanism 63 connected to the drive roller 61, and a servo motor 64 that rotationally drives the drive roller 61 via the transmission mechanism 63. The drive roller unit 60 rotates the drive roller 61 in contact with the stator outer circumferential surface 29 of the stator 11, thereby rotating the stator 11 relative to the first frame 12 and the second frame 13 in the circumferential direction.

[0020] The driven roller portion 70 has a driven roller 71 that contacts the stator outer surface 29 on the opposite side of the axis O from the driving roller 61 while the driving roller 61 rotates the stator 11 relatively in the circumferential direction, and a support portion 72 that supports the driven roller 71 rotatably around a central axis parallel to the axis O.

[0021] The roller moving unit 80 moves the driving roller 61 and the driven roller 71 between a contact position where they contact the stator 11 and a retreat position where they are separated from the stator 11. The roller moving unit 80 has a first moving unit 81 that moves the driving roller 61 and the driven roller 71 in a direction approaching and separating from the stator 11, and a second moving unit 82 that moves the entire unit 35 consisting of the driving roller unit 60, the driven roller unit 70, and the first moving unit 81 in a direction perpendicular to the pallet conveying direction and approaching and separating from the stator 11. The driving roller 61 and the driven roller 71 are moved from the retreat position toward the stator 11 by the second moving unit 82, and then moved toward the stator 11 by the first moving unit 81, thereby moving to the contact position. In FIG. 4, the unit 35 located at the retreat position is indicated by a two-dot chain line.

[0022] As shown in FIG. 7 and FIG. 8, the position of one end of a predetermined terminal wire 25 when the first frame 12 is viewed from the axial direction is defined as a first reference position p1. In one embodiment, the middle terminal wire 25 of the three terminal wires 25 is used as a reference. In addition, the position of the center of the screw hole 26 as the "predetermined portion" when the first frame 12 is viewed from the axial direction is defined as a second reference position p2. In one embodiment, two screw holes 26 are used as references. The amount indicating how much the circumferential position of the stator 11 with respect to the first frame 12 and the second frame 13 is deviated in the circumferential direction from the designed position is defined as the circumferential position deviation amount. FIG. 7 shows a state when the circumferential position of the stator 11 is in the designed position. FIG. 8 shows a state when the circumferential position of the stator 11 is deviated from the designed position. The position of one end of the middle terminal wire 25 when the circumferential position of the stator 11 is in the designed position is defined as p0. The image analysis unit 90 determines the amount of circumferential positional deviation by image analysis based on the relative positional relationship between the first reference position p1 and the second reference position p2.

[0023] The drive roller 61 rotates in contact with the stator outer peripheral surface 29 of the stator 11, thereby relatively rotating the stator 11 in the circumferential direction so that the circumferential position of the stator 11 is as designed. In accordance with the amount of circumferential positional deviation calculated by the image analysis unit 90, the drive roller 61 relatively rotates the stator 11 in the circumferential direction so that the amount of circumferential positional deviation becomes zero.

[0024] The bolt fastening portion 95 fastens the first frame 12 and the second frame 13 together using the through bolts 14. The drive rollers 61 maintain the circumferential position of the stator 11 at the designed position while the bolt fastening portion 95 fastens the first frame 12 and the second frame 13 together. The drive rollers 61 maintain the circumferential position of the stator 11 by stopping rotation while remaining in contact with the stator 11.

[0025] A contact portion 65 of the drive roller 61 that comes into contact with the stator 11 is made of rubber. The drive roller 61 rotates during the period from when it starts to move from the contact position to the waiting position in order to unload the motor 10 for which assembly has been completed, until it moves back to the contact position after the next motor 10 to be assembled is carried in, thereby changing the contact point between the contact portion 65 and the stator 11. In one embodiment, the point at which the contact portion 65 first comes into contact with the stator 11 during assembly is a point that has moved a predetermined angle in the circumferential direction from the point at which the contact portion 65 first came into contact with the stator 11 during the previous assembly.

[0026] (Manufacturing method) Next, a manufacturing method for motor 10 will be described with reference to Fig. 9. This manufacturing method includes a carrying-in process P1, a frame fixing process P2, a roller moving process P3, a stator rotating process P4, a bolt tightening process P5, a roller retracting process P6, and a carrying-out process P7.

[0027] In the carry-in process P1, the assembling device 30 transports the pallet 41 carried in from the device in the previous process to a predetermined assembling position.

[0028] In the frame fixing process P2, the assembly device 30 fixes the circumferential positions of the first frame 12 and the second frame 13 in a state in which the stator 11 is sandwiched in the axial direction.

[0029] In the roller movement process P3, the assembly device 30 moves the drive roller 61 and the driven roller 71 from a retracted position away from the stator 11 to a contact position where they come into contact with the stator 11.

[0030] In the stator rotation process P4, the assembly device 30 determines the amount of circumferential misalignment by image analysis based on the relative positional relationship between the first reference position p1 and the second reference position p2. Next, the assembly device 30 rotates the drive roller 61 in contact with the stator outer peripheral surface 29 to rotate the stator 11 in the circumferential direction relative to the first frame 12 and the second frame 13 so that the amount of circumferential misalignment becomes zero, so that the circumferential position of the stator 11 relative to the first frame 12 and the second frame 13 becomes the designed position. In one embodiment, the calculation of the amount of circumferential misalignment by image analysis and the rotation of the stator 11 are repeated until the amount of circumferential misalignment becomes zero.

[0031] In the bolt tightening process P5, the assembly device 30 fastens the first frame 12 and the second frame 13 together using the through bolts 14. While the bolt tightening portions 95 fasten the first frame 12 and the second frame 13 together, the drive rollers 61 maintain the circumferential position of the stator 11 at the designed position.

[0032] In the roller retraction process P6, the assembly device 30 moves the drive roller 61 and the driven roller 71 from the contact position to the retracted position.

[0033] In the carrying-out process P7, the assembly device 30 carries the pallet 41 out to a device in the subsequent process.

[0034] (effect) As described above, in one embodiment, the assembly device 30 includes a frame fixing portion 50 that fixes the circumferential position of the first frame 12 and the second frame 13 while axially sandwiching the stator 11, and a drive roller 61 that rotates while in contact with the stator outer circumferential surface 29 of the stator 11, thereby rotating the stator 11 relative to the first frame 12 and the second frame 13 in the circumferential direction so that the circumferential position of the stator 11 relative to the first frame 12 and the second frame 13 is as designed.

[0035] The manufacturing method of the motor 10 includes a frame fixing process P2 in which the circumferential position of the first frame 12 and the second frame 13 which axially sandwich the stator 11 is fixed, and a stator rotation process P4 in which the drive roller 61 which is in contact with the stator outer circumferential surface 29 of the stator 11 is rotated to rotate the stator 11 relative to the first frame 12 and the second frame 13 in the circumferential direction so that the circumferential position of the stator 11 relative to the first frame 12 and the second frame 13 becomes the designed position.

[0036] In this manner, by relatively rotating the stator 11 in the circumferential direction using the drive rollers 61, it is possible to eliminate circumferential positional deviation of the stator 11 without forming positioning recesses on the outer periphery of the stator 11. Therefore, the first frame 12 and the second frame 13 can be fastened together in a state in which the circumferential positional deviation of the stator 11 is eliminated, and assembly defects in a later process can be avoided.

[0037] In one embodiment, while the drive roller 61 rotates the stator 11 relatively in the circumferential direction, one driven roller 71 is provided which contacts the stator outer circumferential surface 29 on the opposite side of the axis O from the drive roller 61. This allows the driven roller 71 to support the stator 11 and prevent the stator 11 from falling over.

[0038] In one embodiment, the assembly device 30 includes a bolt tightening unit 95 that fastens the first frame 12 and the second frame 13 together using the through bolts 14. The drive roller 61 maintains the circumferential position of the stator 11 at the designed position while the bolt tightening unit 95 fastens the first frame 12 and the second frame 13 together. This makes it possible to fasten the first frame 12 and the second frame 13 together while eliminating any misalignment of the stator 11 in the circumferential direction.

[0039] In one embodiment, the contact portion 65 of the drive roller 61 that contacts the stator 11 is made of rubber. The assembly device 30 includes a roller moving unit that moves the drive roller 61 between a contact position where the drive roller 61 contacts the stator 11 and a retracted position where the drive roller 61 is separated from the stator 11. The drive roller 61 rotates during the time from when it starts to move from the contact position to the retracted position until it moves back to the contact position, thereby changing the contact location between the contact portion 65 and the stator 11. This makes it possible to suppress uneven wear of the contact portion 65.

[0040] In one embodiment, the terminal wires 25 connected to the windings 24 of the stator 11 are inserted axially through the through holes 23 of the first frame 12. The assembly device 30 includes an image analysis unit that determines the amount of circumferential misalignment by image analysis based on the relative positional relationship between the first reference position p1 and the second reference position p2. The drive rollers 61 relatively rotate the stator 11 in the circumferential direction in accordance with the amount of circumferential misalignment. This allows the circumferential position of the stator 11 to be aligned with high precision.

[0041] [Other embodiments] In another embodiment, two or more driven rollers may be provided. In another embodiment, the drive roller does not need to rotate from the time when it starts to move from the contact position to the retracted position until it moves back to the contact position.

[0042] The present invention is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit of the invention. [Explanation of symbols]

[0043] 10 motor (rotating electric machine), 11 stator, 12 first frame, 13 second frame, 14 through bolt, 50 frame fixing portion, 29 stator outer circumferential surface, 61 drive roller, O shaft center.

Claims

1. A manufacturing device for a rotating electric machine (10) including a stator (11), a first frame (12) provided on one side of the stator in the axial direction, a second frame (13) provided on the other side of the stator in the axial direction, and through bolts (14) fastening the first frame and the second frame together in a state in which the stator is sandwiched in the axial direction, If the direction around the axis (O) of the stator is defined as the circumferential direction, a frame fixing portion (50) that fixes the circumferential positions of the first frame and the second frame in a state in which the stator is sandwiched in the axial direction; a drive roller (61) that rotates while in contact with a stator outer peripheral surface (29) of the stator, thereby relatively rotating the stator in the circumferential direction so that the circumferential position of the stator with respect to the first frame and the second frame is as designed; A manufacturing apparatus for a rotating electric machine comprising:

2. 2. The manufacturing apparatus for a rotating electric machine according to claim 1, further comprising one or more driven rollers (71) that contact the outer peripheral surface of the stator on the opposite side of the axis from the drive roller while the drive roller rotates the stator relatively in the circumferential direction.

3. The manufacturing apparatus for the rotating electric machine further includes a bolt tightening unit (95) that fastens the first frame and the second frame using the through bolt, 2. The manufacturing apparatus for a rotating electric machine according to claim 1, wherein the drive roller maintains the circumferential position of the stator at the designed position while the bolt tightening portion fastens the first frame and the second frame.

4. A contact portion (65) of the drive roller that contacts the stator is made of rubber, The manufacturing apparatus for the rotating electric machine further includes a roller moving unit (80) that moves the drive roller between a contact position where the drive roller contacts the stator and a retreat position where the drive roller is separated from the stator, 4. The manufacturing apparatus for a rotating electric machine according to claim 3, wherein the drive roller rotates during a period from when it starts to move from the contact position to the retreat position until it moves back to the contact position, thereby changing a contact point between the contact portion and the stator.

5. A terminal wire (25) connected to the winding (24) of the stator is inserted axially through a through hole (23) of the first frame, A position of one end of the terminal wire when the first frame is viewed from the axial direction is defined as a first reference position (p1), a position of a predetermined portion of the first frame when the first frame is viewed from the axial direction is defined as a second reference position (p2), and a circumferential deviation amount of the circumferential position of the stator from the designed position is defined as a circumferential position deviation amount. The manufacturing apparatus for the rotating electric machine further includes an image analysis unit (90) that determines the circumferential positional deviation amount by image analysis based on a relative positional relationship between the first reference position and the second reference position, The manufacturing apparatus for a rotating electric machine according to claim 1 , wherein the drive roller relatively rotates the stator in the circumferential direction in accordance with the amount of the circumferential positional deviation.

6. A method for manufacturing a rotating electric machine including a stator, a first frame provided on one side of the stator in an axial direction, a second frame provided on the other side of the stator in the axial direction, and through bolts fastening the first frame and the second frame together in a state in which the stator is sandwiched in the axial direction, the method comprising: If the direction around the axis of the stator is defined as the circumferential direction, a frame fixing process (P2) of fixing a circumferential position of the first frame and the second frame in a state in which the stator is sandwiched in the axial direction; a stator rotating step (P4) of rotating a drive roller in contact with an outer peripheral surface of the stator to rotate the stator in a circumferential direction relative to the first frame and the second frame so that the circumferential position of the stator is a designed position with respect to the first frame and the second frame; A method for manufacturing a rotating electric machine comprising the steps of:

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