JP6582889B2 - Motor and motor manufacturing method - Google Patents

Description

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

  For example, as described in Patent Document 1, some motors have a configuration in which an annular stator core is sandwiched from a pair of end frames in the axial direction and the pair of end frames are connected by through bolts. . The rotation shaft of the rotor arranged inside the stator core is pivotally supported by bearings respectively held by a pair of end frames.

  In the method for manufacturing a motor described in Patent Document 1, first, an arrangement process is performed in which a pair of end frames are arranged on both sides of the stator core in the axial direction. At this time, one end frame and the stator core are centered using a centering jig. Then, the pressurization process which pressurizes an end frame to the stator core side with a pressurization jig is performed. Each end frame has a planar shape perpendicular to the axis of the rotating shaft, and includes a core holding surface that comes into contact with the end surface of the stator core in the axial direction. In the pressurizing step, the pair of end frames are pressed toward the stator core while the core holding surfaces of the pair of end frames are maintained in parallel. Further, a connecting step of connecting the pair of end frames with through bolts is performed during or after the pressing step.

  Thus, by pressing the pair of end frames toward the stator core while maintaining the core holding surfaces of the pair of end frames in parallel, the pair of end frames in the state in which both end surfaces in the axial direction of the stator core are maintained in parallel are paired. The end frame and the stator core can be integrated. And since a pair of end frames which contact | abut to the axial direction both end surfaces of a stator core are maintained in parallel, the axial displacement of the bearings supported by the said pair of end frames, and also the rotating shaft pivotally supported by these bearings. Axis deviation of the rotor having is suppressed.

JP 2014-147172 A

  In the method for manufacturing a motor described in Patent Document 1, when one end frame is arranged on one end side in the axial direction of the stator core in the arranging step, a special jig is used to connect the one end frame to the stator core. Perform centering. Further, in the pressurizing step, when the end frame is pressed toward the stator core by the pressurizing jig while maintaining the centered state of the end frame and the stator core, the end frame is prevented from being deformed by the pressurization. For this reason, a jig for holding the end frame may be required. Therefore, there has been a problem that equipment for manufacturing the motor is large and complicated.

  The present invention has been made to solve the above-described problems, and its object is to align the stator core and the end frame without using complicated equipment, and to further deform the end frame. It is providing the motor which can be suppressed, and the manufacturing method of a motor.

A motor that solves the above problems includes an annular stator core, a pair of end frames that are arranged on both sides of the stator core in the axial direction and respectively hold bearings, and a plurality of end frames that are fixed to each other on the outer periphery of the stator core. The motor includes a through bolt and a rotating shaft rotatably supported by the two bearings, and the stator core includes an annular portion having an annular shape, and a coil that extends radially inward from the annular portion. A plurality of teeth to be mounted, and a core outer peripheral protruding portion that protrudes radially outward from the annular portion and extends along the axial direction so as to surround at least a part of the outer periphery of the through bolt, and each of the end frames A fitting portion in which an end portion in the axial direction of the annular portion is fitted radially inward, a planar shape perpendicular to the axial direction, and an end surface in the axial direction of the annular portion, A non-cutting contact surface that is in contact with the axial end surface of the outer peripheral protrusion, and the inner peripheral surface of the fitting portion is a centering surface for centering the stator core and the end frame And the centering surface is a cutting formation surface, the fitting portion protrudes in an axial direction from the contact surface, and the end frame has an inner peripheral surface of the fitting portion. A groove or a convex portion is provided at a boundary portion with the contact surface .

  According to this configuration, by inserting the axial end of the annular portion of the stator core into the radially inner side of the fitting portion, the stator core and the end frame are centered by the centering surface that is the inner peripheral surface of the fitting portion. It is issued. Therefore, the stator core and the end frame can be easily centered without using a separate centering jig. In addition, the contact surface with which the end surface in the axial direction of the annular portion and the end surface in the axial direction of the core outer peripheral protruding portion abut is a flat surface that is not cut and is not cut. Therefore, the contact surface does not include a step due to cutting. Furthermore, the abutting surface abuts not only on the axial end surface of the annular portion, but also on the axial end surface of the core outer periphery protruding portion. Therefore, each end frame abuts against the end surface of the stator core in the axial direction on a wider surface and is pressed toward the stator core. For these reasons, the pair of end frames are difficult to deform when pressed toward the stator core.

In the motor, it is preferable that the fitting portion is composed of a plurality of fitting walls that are spaced apart in the circumferential direction.
According to this configuration, the inner peripheral surface of the fitting portion is processed to be a centering surface for centering the stator core and the end frame (for example, cutting processing to increase the dimensional accuracy of the fitting portion). The time required can be shortened. Further, even if the motor is flooded and water enters between the outer surface of the stator core and the fitting portion (fitting wall), the fitting walls adjacent in the circumferential direction are separated in the circumferential direction. Water is easily drained to the outside of the motor from between the fitting walls adjacent in the circumferential direction.

In the motor, it is preferable that the core outer peripheral protruding portion is located between the fitting walls adjacent in the circumferential direction and overlaps the fitting wall in the circumferential direction.
According to this configuration, the core outer peripheral protruding portion and the fitting portion (fitting wall) do not overlap in the radial direction. Therefore, even if the stator core has a core outer peripheral protruding portion that protrudes radially outward from the annular portion, the end frame can be prevented from being enlarged in the radial direction.

A method of manufacturing a motor that solves the above problems includes an annular stator core, a pair of end frames that are arranged on both sides of the stator core in the axial direction and that respectively hold bearings, and the pair of end frames are fixed to each other on the outer periphery of the stator core A method of manufacturing a motor comprising a plurality of through bolts and a rotary shaft rotatably supported by the two bearings, wherein the stator core includes an annular part having an annular shape, and a radial direction from the annular part. A plurality of teeth extending inward and wound with a coil, and projecting radially outward from the annular portion and extending along the axial direction so as to surround at least a part of the outer periphery of the through bolt disposed on the outer periphery of the stator core Each of the end frames includes a fitting portion in which an end portion in the axial direction of the annular portion is fitted inward in the radial direction, and an axial direction. It has an orthogonal planar shape and has an end surface in the axial direction of the annular portion and a non-cutting contact surface in contact with the end surface in the axial direction of the core outer peripheral protruding portion, and cuts the inner peripheral surface of the fitting portion. A cutting step for increasing the dimensional accuracy of the inner peripheral surface of the fitting portion, and after the cutting step, the axial end surface of the annular portion and the axial end surface of the core outer peripheral protruding portion become the contact surface. The end frame is arranged with respect to the stator core while centering the stator core and the end frame by fitting the axial end of the annular portion into the radially inner side of the fitting portion until it abuts. The placing step, the pressurizing step for pressurizing the pair of end frames to the stator core side after the placing step, and the pair of end frames in the middle of the pressurizing step or after the pressurizing step. The And a connecting step of fixedly connected at Boruto, the fitting portion, the projects axially from the abutment surface, wherein the end frame, the inner circumferential surface of the fitting portion equivalent A cutting suppression portion that suppresses cutting of the contact surface in the cutting step is provided at a boundary portion with the contact surface .

  According to this method, the dimensional accuracy of the inner peripheral surface of the fitting portion is increased by cutting the inner peripheral surface of the fitting portion. Therefore, the stator core and the end frame can be centered by the inner peripheral surface of the fitting portion by fitting the axial end of the annular portion of the stator core inside the fitting portion in the radial direction. Therefore, the stator core and the end frame can be easily centered without using a separate centering jig. Moreover, the contact surface with which the axial end surface of an annular part and the axial end surface of a core outer periphery protrusion part contact | abut is a plane which is not cut. Therefore, the contact surface does not include a step due to cutting. Furthermore, the abutting surface abuts not only on the axial end surface of the annular portion, but also on the axial end surface of the core outer periphery protruding portion. Therefore, each end frame abuts against the end face in the axial direction of the stator core with a wider surface in the pressurizing step and is pressed toward the same stator core. For these reasons, the pair of end frames are difficult to be deformed when pressed to the stator core side in the pressing step.

Moreover, since the fitting part protrudes from the contact surface in the axial direction, the inner peripheral surface of the fitting part and the contact surface are close to each other. And since it is suppressed by the cutting suppression part that a contact surface is cut in a cutting process, it is suppressed that a level | step difference is formed in a contact surface by cutting.
In the method for manufacturing the motor, the fitting portion is preferably composed of a plurality of fitting walls arranged spaced apart in the circumferential direction.
According to this method, it is easier to cut the inner peripheral surface of the fitting portion in the cutting process than when the fitting portion has an annular shape. Further, the time required for cutting the inner peripheral surface of the fitting portion can be shortened.

In the motor manufacturing method, it is preferable that in the arranging step, the core outer peripheral protruding portion is arranged between the fitting walls adjacent in the circumferential direction and overlaps the fitting wall in the circumferential direction.
According to this method, it arrange | positions so that a core outer periphery protrusion part and a fitting part (fitting wall) may not overlap in radial direction. Therefore, even if the stator core has a core outer peripheral protruding portion that protrudes radially outward from the annular portion, the end frame can be prevented from being enlarged in the radial direction.

  According to the motor and the motor manufacturing method of the present invention, the stator core and the end frame can be centered without using complicated equipment, and the deformation of the end frame can be suppressed.

It is sectional drawing which shows schematic structure of the motor of embodiment. It is a disassembled perspective view of the motor of an embodiment. (A) is a side view of the motor of the embodiment, (b) is a cross-sectional view of the motor of the embodiment (b-b cross-sectional view in (a)). (A) is a perspective view of a second end frame in the embodiment, (b) is a partially enlarged perspective view of the second end frame. It is a partial expanded sectional view of the motor of an embodiment. It is a partial expansion perspective view of the motor of an embodiment. It is sectional drawing which represents typically the manufacturing method of the motor of embodiment. It is a partial expanded sectional view of the motor of another form.

Hereinafter, an embodiment of a motor and a method for manufacturing the motor will be described.
As shown in FIG. 1, the motor 10 includes an annular stator 13 formed by a first end frame 11 (hereinafter referred to as a first frame 11) and a second end frame 12 (hereinafter referred to as a second frame 12). The structure is sandwiched in the direction of the rotation axis. The first frame 11 and the second frame 12 are fixed to each other by a plurality of (two in the present embodiment) through bolts 14 arranged on the outer periphery of the stator 13. A rotor 15 is rotatably arranged inside the stator 13. In this embodiment, the end frame that holds the stator 13 on the opposite side in the axial direction of the motor 10 (upper side in FIG. 1) is referred to as the first frame 11, and the end frame that holds the stator 13 on the axial direction output side is the first frame. Two frames 12 are provided.

  As shown in FIGS. 1 and 2, the stator 13 includes an annular stator core 16 and a coil 17 wound around the stator core 16. As shown in FIG. 3B, the stator core 16 includes an annular portion 16a having an annular shape, and a plurality (60 in the present embodiment) of teeth 16b extending radially inward from the annular portion 16a and arranged in the circumferential direction. It is composed of four core outer protrusions 16c that protrude radially outward from the outer peripheral surface of the annular part 16a and extend along the axial direction. The outer peripheral surface of the annular portion 16a has a cylindrical shape, and both end surfaces in the axial direction of the annular portion 16a have a planar shape orthogonal to the axial direction. The coil 17 is wound around the plurality of teeth 16b.

  As shown in FIGS. 3 (a) and 3 (b), the core outer peripheral protruding portion 16c has four equiangular intervals (90 ° intervals in the present embodiment) in the circumferential direction on the outer peripheral surface of the annular portion 16a. Is provided. Each core outer protrusion 16c forms a ridge extending along the axial direction from one end of the annular portion 16a to the other end, and the shape seen from the axial direction extends in the circumferential direction from the proximal end toward the distal end. It has a substantially trapezoidal shape with a narrow width. Further, each core outer periphery protruding portion 16c is formed with an arc recess 16d that is recessed from the distal end (radially outer end) of each core outer periphery protruding portion 16c toward the base end. The circular arc recess 16d has a circular arc shape when viewed from the axial direction and a groove shape penetrating the core outer peripheral protruding portion 16c in the axial direction. Note that the radius of curvature of the arc recess 16d is slightly larger than the radius of the male screw-like portion of the through bolt 14. And two core outer periphery protrusions 16c (two core outer periphery protrusions provided on the left and right in FIG. 3B) provided at two positions 180 ° apart in the circumferential direction among the four core outer periphery protrusions 16c. A through bolt 14 having a substantially cylindrical shape extending in the axial direction is disposed in the arc recess 16d of 16c). These two core outer peripheral protrusions 16c surround about half of the outer periphery of the through bolt 14 when viewed from the axial direction.

  As shown in FIG. 1, the stator core 16 is formed by laminating a plurality of core sheets 18 formed by stamping a steel plate by press working in the axial direction and integrating them. In addition, the core sheet 18 at both ends in the axial direction of the stator core 16 has an L-shaped cross section in which the radially inner ends of the portions constituting the teeth 16b are bent outward in the axial direction. Therefore, it is possible to secure the axial length of the radially inner end surface 16e (the surface facing the rotor 15) of the teeth 16b while keeping the stack thickness of the stator core 16 (the thickness of the laminated core sheets 18 as a whole) small. It is possible. In FIG. 3A and FIG. 6, the core sheet 18 is omitted and the stator core 16 is simplified.

  As shown in FIGS. 1 and 2, the first frame 11 and the second frame 12 arranged on both sides of the stator core 16 in the axial direction are made of a metal material and formed by casting. The first and second frames 11, 12 are substantially disc-shaped first and second main body portions 21, 31, and cylindrical first members extending in the axial direction from the first and second main body portions 21, 31. And second stator holding portions 22 and 32, respectively. In addition, the first and second frames 11 and 12 include a plurality of (in the present embodiment, integrally provided on the outer peripheral surfaces of the first and second stator holding portions 22 and 32 and the first and second main body portions 21 and 31. First and second bolt fastening portions 23, 33). The first and second bolt fastening portions 23 and 33 are provided at equiangular intervals in the circumferential direction (180 ° intervals in the present embodiment). As shown in FIGS. 2 and 3B, each first bolt fastening portion 23 is formed with a first fastening hole 23 a through which the through bolt 14 is inserted, and each second bolt fastening portion 33. Is formed with a female screw-like second fastening hole 33a into which the through bolt 14 is screwed. In the first frame 11 and the second frame 12, the first and second bolt fastening portions 23 and 33 are connected to each other by the through bolt 14 that passes through the first fastening hole 23a and is screwed into the second fastening hole 33a. Thus, they are fixed and integrated with each other. Further, the second frame 12 has a fixing portion 34 for fixing the motor 10 to an external fixing place with a screw (not shown). The fixing portion 34 is extended radially outward from two locations in the second main body portion 31 that are displaced in the circumferential direction from the two second bolt fastening portions 33. For example, the motor 10 is fixed at a fixed place such that the second frame 12 is positioned below the first frame 11.

  As shown in FIGS. 2 and 3 (a), one end of the stator core 16 in the axial direction (the upper end in FIG. 3 (a)) is fitted radially inward at the tip of the first stator holding portion 22. A first fitting portion 25 is formed. Similarly, a second fitting portion 35 in which the other axial end portion (the lower end portion in FIG. 3A) of the stator core 16 is fitted radially inward is provided at the distal end portion of the second stator holding portion 32. Is formed.

  The first fitting portion 25 is composed of a plurality (four in this embodiment) of first fitting walls 25a that are spaced apart in the circumferential direction. The four first fitting walls 25a are provided at equiangular intervals (90 ° intervals in the present embodiment) in the circumferential direction. Further, the four first fitting walls 25a are arranged one by one between the core outer peripheral protrusions 16c adjacent in the circumferential direction. That is, the core outer peripheral protrusion 16c is positioned between the first fitting walls 25a adjacent in the circumferential direction and overlaps the first fitting wall 25a in the circumferential direction. The core outer periphery protruding portion 16c does not overlap the first fitting wall 25a in the radial direction. The second fitting portion 35 is composed of a plurality of (eight in the present embodiment) second fitting walls 35a that are spaced apart in the circumferential direction. One second fitting wall 35a is disposed on each side in the circumferential direction of each core outer peripheral protrusion 16c (that is, two between the core outer peripheral protrusions 16c adjacent in the circumferential direction). That is, the core outer peripheral protrusion 16c is positioned between the second fitting walls 35a adjacent in the circumferential direction and overlaps with the second fitting wall 35a in the circumferential direction. The core outer periphery protruding portion 16c does not overlap the second fitting wall 35a in the radial direction.

  The first and second fitting portions 25, 35 (first and second fitting walls 25 a, 35 a) are more radially thicker than the proximal end portions of the first and second stator holding portions 22, 32. Is formed thinly. The first and second fitting walls 25a and 35a extend in parallel with the axial direction and have an arc shape along the circumferential direction when viewed from the axial direction. Further, each of the first and second fitting walls 25a and 35a has a narrower width in the circumferential direction from the proximal end toward the distal end (ends on the distal end side of the first and second stator holding portions 22 and 35). .

  As shown in FIG. 2, FIG. 4 (a) and FIG. 4 (b), the inner peripheral surfaces of the first and second fitting portions 25, 35, that is, the diameters of the first and second fitting walls 25a, 35a. The side surfaces on the inner side are first and second centering surfaces 25 b and 35 b for centering the first and second frames 11 and 12 and the stator core 16. In FIG. 4B, dots are given to the second centering surface 35b. The first and second centering surfaces 25b, 35b are inner peripheral surfaces of the first and second fitting portions 25, 35 (in order to increase the dimensional accuracy of the inner peripheral surfaces of the first and second fitting portions 25, 35). That is, it is a surface formed by cutting the radially inner side surfaces of the first and second fitting walls 25a and 35a. In the first frame 11, the four first centering surfaces 25 b are located on the same circle having the center on the central axis of the first stator holding portion 22 when viewed from the axial direction. Similarly, in the second frame 12, the eight second centering surfaces 35b are located on the same circle having the center on the central axis of the second stator holding portion 32 when viewed from the axial direction (FIG. 3B). )reference). In the motor 10, the central axes of the first and second stator holding portions 22, 32 coincide with the central axis of the stator core 16. As shown in FIGS. 2 and 3B, the inner diameters of the first and second fitting portions 25 and 35 are equal to or slightly larger than the outer diameter of the annular portion 16a. That is, the radius of curvature of the first and second centering surfaces 25b and 35b is equal to or slightly larger than the radius of the annular portion 16a. On the other hand, as shown in FIG. 1, the inner diameter of the first and second stator holding portions 22, 32 on the proximal side of the first and second fitting portions 25, 35 is outside the annular portion 16 a. The value is smaller than the diameter.

  As shown in FIGS. 2, 4 (a), and 4 (b), the first and second frames 11, 12 are arranged in a direction perpendicular to the central axes of the first and second stator holding portions 22, 32. It has the 1st and 2nd contact surfaces 26 and 36 adjacent to the base end part of the 1 and 2nd fitting parts 25 and 35. As shown in FIG. In FIG. 4B, dots that are rougher than the dots attached to the second centering surface 35b are attached to the second contact surface 36. In the second frame 12, the second abutment surface 36 includes an axial tip end surface excluding the second fitting portion 35 in the second stator holding portion 32, and an axial direction on the stator core 16 side in the second bolt fastening portion 33. It is provided over the end surface and forms an annular shape. As shown in FIGS. 1, 2, and 3 (a), in the first frame 11, the first contact surface 26 is an axial front end surface excluding the first fitting portion 25 in the first stator holding portion 22. , And the axial end surface of the first bolt fastening portion 23 on the stator core 16 side, and has an annular shape. Further, the first and second contact surfaces 26 and 36 have a planar shape orthogonal to the central axis of the first and second stator holding portions 22 and 32 (same as the axis L1 of the rotation shaft 51 of the rotor 15 described later). There is no. Furthermore, since the first and second contact surfaces 26 and 36 are flat surfaces that are not cut and are not cut, they are flat surfaces that are not stepped. The first abutting surface 26 has one axial end surface (the upper end surface in FIG. 3A) of the annular portion 16a fitted in the first fitting portion 25, and the axis of each core outer peripheral protruding portion 16c. One end surface in the direction (upper end surface in FIG. 3A) is in contact with the axial direction. Further, the second contact surface 36 has the other end surface in the axial direction of the annular portion 16a fitted in the second fitting portion 35 (the lower end surface in FIG. 3A), and the shaft of each core outer peripheral protruding portion 16c. The other end surface in the direction (the lower end surface in FIG. 3A) is in contact with the axial direction. In this state, the first frame 11 and the second frame 12 are fixed to each other by the through bolts 14 while the stator 13 is sandwiched between the first and second stator holding portions 22 and 32.

  In the present embodiment, the first and second fitting portions 25 and 35 (first and second fitting walls 25a and 35a) provided at the tip portions of the first and second stator holding portions 22 and 32 are The first and second contact surfaces 26 and 36 protrude in the axial direction. Therefore, the first centering surface 25b and the first contact surface 26 are close to each other at a right angle in the first frame 11, and the second centering surface 35b and the second contact surface 36 are in the second frame 12. They are close to each other at a right angle.

  As shown in FIG. 1, FIG. 4B and FIG. 5, the first and second stator holding portions 22 and 32 have first and second centering surfaces 25b and 35b and first and second contacts. First and second cutting suppression grooves 27 and 37 are provided at the boundary portions with the contact surfaces 26 and 36. The first and second cutting suppression grooves 27 and 37 are formed when the inner peripheral surfaces of the first and second fitting portions 25 and 35 are cut to form the first and second centering surfaces 25b and 35b. This is to prevent the first and second contact surfaces 26 and 36 from being cut. The first and second cutting suppression grooves 27 and 37 are formed in the first and second stator holding portions 22 and 32 at the first and second fitting walls 25a and 35a at the radially inner portions of the base ends of the first and second fitting walls 25a and 35a. The second centering surfaces 25b and 35b extend along end portions on the first and second contact surfaces 26 and 36 side. The first and second cutting suppression grooves 27 and 37 are recessed in the axial direction. Furthermore, the circumferential lengths of the first and second cutting suppression grooves 27 and 37 are substantially equal to the circumferential widths at the base end portions of the first and second fitting walls 25a and 35a.

  As shown in FIG. 1, a pressurized surface 28 is formed on the axially outer end surface of the first body portion 21, and a pressurized surface 38 is formed on the axially outer end surface of the second body portion 31. . Each of the pressurized surfaces 28 and 38 has a planar shape orthogonal to an axis L1 of a rotation shaft 51 of the rotor 15 described later. Further, the pressurized surface 28 is parallel to the first contact surface 26, and the pressurized surface 38 is parallel to the second contact surface 36. In addition, a stepped portion 39 that protrudes outward in the axial direction from the pressed surface 38 is formed on the axially outer end surface of the second frame 12.

  A bearing housing portion 29 is formed in the center portion of the first main body portion 21 so as to be recessed so that the ball bearing B1 can be assembled from the axial stator 13 side (inside the motor 10). The bearing housing portion 29 has a circular shape when viewed in the axial direction, and has a cylindrical shape with an inner peripheral surface extending in the axial direction. Further, the central axis of the bearing housing portion 29 coincides with the central axis of the first stator holding portion 22 (the central axis of the first fitting portion 25). The first frame 11 accommodates and holds an annular ball bearing B1 in the bearing accommodating portion 29. A through hole 29 a is formed in the center of the bottom of the bearing housing 29 so as to penetrate the bottom of the bearing housing 29 in the axial direction. The ball bearing B1 is urged in the axial direction toward the stator 13 between the radially outer portion of the through hole 29a at the bottom of the bearing housing 29 and the ball bearing B1 housed in the bearing housing 29. A wave washer 41 is interposed.

  A bearing housing portion 40 that houses and holds an annular ball bearing B <b> 2 is recessed in the central portion of the second main body portion 31. The bearing housing portion 40 has a concave shape that is recessed from the axially outer end surface of the second frame 12 toward the inner side (stator 13 side) of the motor 10. That is, the bearing housing portion 40 is formed so that the ball bearing B2 can be assembled from the outside of the motor 10 (the side opposite to the stator 13). Further, the center axis of the bearing housing portion 40 coincides with the center axis of the second stator holding portion 32 (the center axis of the second fitting portion 35). The second frame 12 holds the ball bearing B <b> 2 disposed in the bearing housing portion 40 so as to be coaxial with the ball bearing B <b> 1 held by the first frame 11. Further, the ball bearing B <b> 2 is axially positioned by contacting the bottom of the bearing housing portion 40 from the axial direction. A through hole 40 a that penetrates the bottom of the bearing housing 40 in the axial direction is formed at the center of the bottom of the bearing housing 40.

  The rotor 15 includes a rotating shaft 51 rotatably supported by the ball bearings B1 and B2, a cylindrical rotor core 52 fixed to the rotating shaft 51 so as to be integrally rotatable, and a plurality of members fixed to the outer peripheral surface of the rotor core 52. It consists of a magnet 53. Each magnet 53 faces the inner peripheral surface of the stator core 16 (the radially inner end surface 16e of the teeth 16b) in the radial direction. The distal end portion (lower end portion in FIG. 1) of the rotating shaft 51 passes through the through hole 40a and protrudes from the ball bearing B2 to the outside of the motor 10, and a joint (not shown) as an output portion is formed at the protruding portion. Installed.

  As shown in FIG. 2, a control unit 61 is fixed to the outer surface of the first frame 11. The control unit 61 includes a cover 62 fixed to the first frame 11 and a circuit board 63 accommodated inside the cover 62. The end of the coil 17 is electrically connected to the circuit board 63. Further, a connector part 64 to which an external connector (not shown) for supplying power to the motor 10 is connected is fixed to the circuit board 63, and the connector part 64 is exposed to the outside of the cover 62. Then, the power supplied from the external connector is supplied to the coil 17 via the circuit board 63, so that the rotor 15 rotates.

Next, a method for manufacturing the motor 10 of this embodiment will be described with reference to FIG.
First, the cutting process which raises the dimensional accuracy of the internal peripheral surface of the 1st and 2nd fitting parts 25 and 35 by cutting the internal peripheral surface of the 1st and 2nd fitting parts 25 and 35 is performed. In this cutting step, the first and second fitting walls 25a and 35a of the first and second frames 11 and 12 formed by casting are cut on the radially inner side surfaces. Thereby, the dimensional accuracy of the inner peripheral surfaces of the first and second fitting portions 25 and 35 is enhanced, and the radially inner side surfaces of the first and second fitting walls 25a and 35a are the first and second side surfaces. The centering surfaces 25b and 35b are formed. When cutting the radially inner side surfaces of the first and second fitting walls 25a, 35a, the boundary between the first and second fitting walls 25a, 35a and the first and second contact surfaces 26, 36 The first and second contact surfaces 26 and 36 are suppressed from being cut by the first and second cutting suppression grooves 27 and 37 that are recessed in the axial direction.

  Next, the arrangement | positioning process which each arrange | positions the 1st frame 11 and the 2nd frame 12 to the axial direction both sides of the stator core 16 is performed. A coil 17 is wound around the teeth 16b of the stator core 16 in advance. In the arranging step, first, one end portion in the axial direction of the annular portion 16 a (the upper end portion in FIG. 7) is fitted into the first fitting portion 25 in the radial direction. At this time, in the stator core 16, the outer peripheral surface of the annular portion 16a serves as a centering reference surface, and in the first frame 11, the first centering surface 25b serves as a centering reference surface, and the stator core 16 and the first frame 11 are centered. It is issued. Further, the annular portion 16a is fitted into the first fitting portion 25 until the entire outer peripheral edge portion at one end surface in the axial direction (the upper end surface in FIG. 7) abuts on the first abutting surface 26 from the axial direction. . Furthermore, the axial end faces of the four core outer protrusions 16c are also in contact with the first contact surface 26 from the axial direction (see FIG. 3A). Of the four core outer peripheral protrusions 16c, the two core outer peripheral protrusions 16c that are spaced 180 ° in the circumferential direction are arranged at positions where the positions in the circumferential direction coincide with the two first bolt fastening portions 23, The first contact surface 26 is in contact with a portion provided in the first bolt fastening portion 23 from the axial direction. Moreover, each core outer periphery protrusion part 16c is arrange | positioned between the 1st fitting walls 25a adjacent to the circumferential direction, and overlaps with the 1st fitting wall 25a in the circumferential direction (refer FIG. 2). When viewed from the axial direction, the inner peripheral surface of the arc recess 16d is concentric with the first fastening hole 23a.

  Then, the several place of the circumferential direction of the 1st fitting part 25 is crimped from the radial direction outer side. Then, the caulking portion in the first fitting portion 25 is plastically deformed toward the inner peripheral side and is brought into pressure contact with the outer peripheral surface of the stator core 16. Thereby, the stator core 16 is fixed to the first fitting portion 25, and the integrally assembled product X of the stator core 16 and the first frame 11 is formed.

  Next, the ball bearing B2 is fixed to the bearing housing portion 40 of the second frame 12, and then the rotating shaft 51 of the rotor 15 is assembled to the ball bearing B2. Further, the other ball bearing B1 is assembled in the vicinity of the counter-output end portion of the rotating shaft 51. Further, the wave washer 41 is accommodated in the bearing accommodating portion 29 of the first frame 11 (or the wave washer 41 is externally mounted on the rotating shaft 51 and placed on the upper side of the ball bearing B1 (the side opposite to the stator 13)). In addition, the assembly | attachment to the rotating shaft 51 of the ball bearing B1 does not necessarily need to be performed at this process, and may be performed in advance. Thereafter, the rotating shaft 51 of the rotor 15 is inserted inside the stator core 16, and the ball bearing B <b> 1 is fixed to the bearing housing portion 29 of the first frame 11.

  Next, the integrated assembly X and the second frame 12 are assembled. This step is performed to complete the arrangement step. In this step, the other end portion in the axial direction of the annular portion 16 a, that is, the end portion in the axial direction opposite to the first frame 11 in the annular portion 16 a is fitted into the second fitting portion 35 of the second frame 12. At this time, in the stator core 16, the outer peripheral surface of the annular portion 16a serves as a centering reference surface, and in the second frame 12, the second centering surface 35b serves as a centering reference surface, and the stator core 16 (integrated assembly X) and The second frame 12 is centered. In addition, the annular portion 16a has a second end surface in the axial direction (an end surface opposite to the first frame 11 and a lower end surface in FIG. 7) until the second end surface 36 contacts the second contact surface 36 from the axial direction. 2 is fitted into the fitting portion 35. Furthermore, the other axial end surfaces (end surfaces opposite to the first frame 11) of the four core outer peripheral protrusions 16 c are also in contact with the second contact surface 36 from the axial direction. Of the four core outer protrusions 16c, the two core outer protrusions 16c that are spaced 180 ° in the circumferential direction are arranged at positions where the circumferential positions coincide with the two second bolt fastening parts 33, 2 Abutting from the axial direction on a portion provided on the second bolt fastening portion 33 on the abutting surface 36 (see FIG. 6). Moreover, each core outer periphery protrusion part 16c is arrange | positioned between the 2nd fitting walls 35a adjacent to the circumferential direction, and overlaps with the 2nd fitting wall 35a in the circumferential direction (refer FIG.3 (b)). When viewed from the axial direction, the inner peripheral surface of the arc recess 16d is concentric with the second fastening hole 33a.

  After the above arrangement step, a pressurizing step of pressurizing the first and second frames 11 and 12 toward the stator core 16 using the pressurizing jig 70 having the first pressurizing surface 71 and the second pressurizing surface 72 parallel to each other. I do. The pressurizing jig 70 includes a fixed base 73 and a movable pressurizing unit 74 that are arranged to face each other. The first pressure surface 71 is provided in the movable pressure portion 74 and has a planar shape perpendicular to the axis L <b> 1 of the rotation shaft 51. The second pressure surface 72 is provided on the fixed base 73 and has a planar shape that is orthogonal to the axis L <b> 1 of the rotation shaft 51 and parallel to the first pressure surface 71. In the pressurizing step, the first pressurizing surface 71 is in close contact with the pressed surface 28 of the first frame 11 from the axial direction. Similarly, the second pressure surface 72 is in close contact with the pressure surface 38 of the second frame 12 from the axial direction. Then, the pressed surface 28 of the first frame 11 is pressed toward the stator core 16 side along the axial direction by the first pressing surface 71 of the movable pressing portion 74. That is, the first frame 11 and the second frame 12 are pressed in the axial direction toward the stator core 16 by the pressing jig 70. At this time, the frames 11 and 12 are pressurized toward the stator core 16 side in a state where the first and second contact surfaces 26 and 36 orthogonal to the axis L1 of the rotating shaft 51 are maintained in parallel. Thereby, the stator core 16 is pressurized so that it may be pinched | interposed from the axial direction both sides by the 1st and 2nd contact surfaces 26 and 36 orthogonal to the axis line L1 of the rotating shaft 51. FIG.

  Moreover, in this embodiment, the connection process which connects and fixes the 1st flame | frame 11 and the 2nd flame | frame 12 with the through bolt 14 in the middle of a pressurization process is performed. In other words, the first frame 11 and the second frame 12 are attached to the through bolt 14 in a state where the pressurized surfaces 28 and 38 of the first and second frames 11 and 12 are pressurized by the first and second pressure surfaces 71 and 72. To fix them together. Thus, the first and second frames 11 and 12 and the stator core 16 are assembled together. Then, the control part 61 is assembled | attached to the 1st flame | frame 11, and the motor 10 is completed.

Next, the operation of this embodiment will be described.
The first and second fitting portions 25, 35 are cut by cutting the inner peripheral surfaces of the first and second fitting portions 25, 35, that is, the radially inner side surfaces of the first and second fitting walls 25a, 35a. The dimensional accuracy of the inner peripheral surface 35 is increased. Therefore, the inner peripheral surfaces of the first and second fitting portions 25 and 35, that is, by inserting the end portions in the axial direction of the annular portion 16a inside the first and second fitting portions 25 and 35 in the radial direction, The stator core 16 and the first and second frames 11 and 12 are centered by the first and second centering surfaces 25b and 35b.

  Further, the first and second contact surfaces 26 and 36 with which the end surface in the axial direction of the annular portion 16a and the end surface in the axial direction of the core outer periphery protruding portion 16c abut are flat surfaces that are not subjected to cutting. Therefore, the first and second contact surfaces 26 and 36 are not formed with a step due to the cutting process. Further, the first and second contact surfaces 26 and 36 contact not only the end surface in the axial direction of the annular portion 16a but also the end surface in the axial direction of the core outer periphery protruding portion 16c. Therefore, the first and second frames 11 and 12 of the present embodiment have a wider surface than the case where only the end face in the axial direction of the annular portion 16a contacts the first and second frames 11 and 12. Is pressed against the stator core 16 side. Further, when the pair of frames 11 and 12 are connected and fixed by the through bolts 14 in the connecting step, the portions of the pair of frames 11 and 12 that are pressurized to the stator core 16 side by the through bolts 14 (that is, the first and first frames). Between the two-bolt fastening portions 23 and 33), the core outer peripheral protruding portion 16c is interposed. Therefore, the axial pressure applied to each of the frames 11 and 12 when the through bolt 14 is tightened can also be received by the core outer peripheral protrusion 16c. For these reasons, the pair of frames 11 and 12 are not easily deformed when pressed toward the stator core 16 side.

Next, characteristic effects of the present embodiment will be described.
(1) The centering of the stator core 16 and the first and second frames 11 and 12 can be easily performed without using a separate centering jig. In addition, when the first and second frames 11 and 12 are pressed toward the stator core 16 in the pressurizing step and the connecting step, the first and second frames 11 and 12 are prevented from being deformed by the pressurization as in the past. Therefore, the deformation of the first and second frames 11 and 12 can be suppressed without using a jig for holding the frames 11 and 12. Therefore, centering of the stator core 16 and the first and second frames 11 and 12 can be performed without using complicated equipment, and deformation of the first and second frames 11 and 12 can be suppressed. .

  (2) The 1st and 2nd fitting parts 25 and 35 are comprised from the some 1st and 2nd fitting walls 25a and 35a which are spaced apart and arranged in the circumferential direction. Therefore, the inner peripheral surfaces of the first and second fitting portions 25, 35 are first and second centering surfaces 25 b, 35 b for centering the first and second frames 11, 12 and the stator core 16. Therefore, the time required for the cutting process for performing the cutting process can be shortened. Further, when the motor 10 is submerged in a state where the motor 10 is fixed at a fixed place so that the second frame 12 is positioned below the first frame 11, the outer surface of the stator core 16 and the second fitting portion 35 are immersed. There is a possibility that water may enter between the second fitting wall 35a. In this case, since the second fitting walls 35a adjacent in the circumferential direction are separated from each other in the circumferential direction, the water that has entered between the outer surface of the stator core 16 and the second fitting portion 35 (second fitting wall 35a). Is easily drained to the outside of the motor 10 from between the second fitting walls 35a adjacent in the circumferential direction.

  (3) The core outer peripheral protrusion 16c is located between the first and second fitting walls 25a and 35a adjacent in the circumferential direction and overlaps the first and second fitting walls 25a and 35a in the circumferential direction. Therefore, the core outer periphery protruding portion 16c and the first and second fitting portions 25 and 35 (first and second fitting walls 25a and 35a) do not overlap in the radial direction. Therefore, even if the stator core 16 has the core outer periphery protruding portion 16c that protrudes radially outward from the annular portion 16a, it is possible to prevent the first and second frames 11 and 12 from being enlarged in the radial direction. it can. As a result, it is possible to suppress the deformation of the first and second frames 11 and 12 without using complicated equipment while suppressing the increase in size of the motor 10 in the radial direction.

  (4) Since the first and second fitting portions 25 and 35 (first and second fitting walls 25a and 35a) protrude in the axial direction from the first and second contact surfaces 26 and 36, the first And the inner peripheral surface (namely, 1st and 2nd centering surface 25b, 35b) of the 2nd fitting parts 25 and 35 and the 1st and 2nd contact surfaces 26 and 36 adjoin at right angle. The first and second frames 11 and 12 have first and second centering surfaces at the boundary between the first and second centering surfaces 25b and 35b and the first and second contact surfaces 26 and 36. It has the 1st and 2nd cutting suppression grooves 27 and 37 extended along the edge part by the side of the 1st and 2nd contact surfaces 26 and 36 in 25b and 35b. Therefore, when the inner peripheral surfaces of the first and second fitting portions 25 and 35 are cut in the cutting process, the first and second cutting restrains that the first and second contact surfaces 26 and 36 are cut. It can be suppressed by the grooves 27 and 37. Therefore, it is possible to suppress the formation of steps on the first and second contact surfaces 26 and 36 by cutting. Moreover, since the 1st and 2nd cutting suppression grooves 27 and 37 are grooves, the 1st and 2nd frames 11 and 12 which have the 1st and 2nd cutting suppression grooves 27 and 37 can be formed easily. .

In addition, you may change the said embodiment as follows.
In the above embodiment, the first and second frames 11 and 12 are connected to the inner peripheral surfaces of the first and second fitting portions 25 and 35 (ie, the first and second centering surfaces 25a and 35a) and the first and second frames 11 and 12, respectively. First and second cutting restraining grooves 27 as cutting restraining portions that restrain the first and second abutting faces 26 and 36 from being cut in the cutting process at the boundary portions with the second abutting faces 26 and 36. , 37 are provided. However, the shape of the cutting suppression part which suppresses that the 1st and 2nd contact surfaces 26 and 36 are cut by a cutting process is not restricted to this.

  For example, in the example illustrated in FIG. 8, the second frame 12 includes a cutting suppression convex portion 82 at a boundary portion between the second centering surface 35 b and the second contact surface 36. The cutting suppression convex portion 82 protrudes in the axial direction from the second contact surface 36 toward the stator core 16 at the boundary portion between the second centering surface 35b and the second contact surface 36, and on the second centering surface 35b. It extends along the end (the lower end in FIG. 8) on the second contact surface 36 side. Further, the cutting suppression convex portion 82 has a quadrangular cross-sectional shape perpendicular to the circumferential direction, and the axial height of the cutting suppression convex portion 82 is lower than the thickness of the core sheet 18. In the example shown in FIG. 8, core sheets 18 a (only one sheet on the second frame 12 side is shown in FIG. 8) disposed at both ends in the axial direction among the plurality of core sheets 18 constituting the stator core 16 are: The outer diameter is slightly smaller than that of the plurality of core sheets 18 arranged between the two core sheets 18a. The radial width of the cutting suppression convex portion 82 is such that the outer diameter (radius) between the core sheet 18a disposed at the axial end of the stator core 16 and the core sheet 18b adjacent to the core sheet 18a in the axial direction. It is narrower than the difference.

  In a state in which the end portion in the axial direction of the annular portion 16a is fitted into the second fitting portion 35, the cutting suppression convex portion 82 is opposed to the core sheet 18a at the end in the axial direction of the stator core 16 in the radial direction. It faces the outer peripheral edge of the core sheet 18b adjacent to the core sheet 18a in the axial direction in the axial direction. In the same state, the outer peripheral surface of the annular portion 16a is not in contact with the end portion of the second centering surface 35b on the proximal end side of the second fitting wall 35a. Further, in the same state, a gap G is provided between the outer surface of the stator core 16 (core sheets 18a and 18b) and the cutting suppression convex portion 82. And since the 2nd fitting part 35 is comprised from the several 2nd fitting wall 35a spaced apart in the circumferential direction, this gap | interval G is the space between the 2nd fitting walls 35a adjacent to the circumferential direction. To the outside of the motor 10.

  In this case, when the inner peripheral surface of the second fitting portion 35 is cut to be a second centering surface 35b for centering the stator core 16 and the second frame 12, the second contact surface is cut. Cutting 36 can be suppressed by the cutting suppression convex portion 82. Therefore, it can suppress that a level | step difference is formed in the 2nd contact surface 36 by cutting. Further, the motor 10 may be fixed at a fixed place so that the second frame 12 is positioned below the first frame 11 (see FIG. 1). In this case, even if the motor 10 is submerged and water enters between the outer surface of the stator core 16 and the second fitting portion 35 (second fitting wall 35a), the water is circumferentially introduced from the gap G. Between the second fitting walls 35a adjacent to each other and discharged to the outside of the motor 10 (outside surface of the second main body 31). Thus, since the 2nd fitting wall 35a adjacent to the circumferential direction is spaced apart in the circumferential direction, it permeated between the outer surface of the stator core 16 and the 2nd fitting part 35 (2nd fitting wall 35a). Water is easily drained to the outside of the motor 10 from between the second fitting walls 35a adjacent in the circumferential direction.

  Similarly for the first frame 11, the same cutting suppression protrusion as the cutting suppression protrusion 82 instead of the first cutting suppression groove 27 is formed at the boundary between the first centering surface 25 b and the first contact surface 26. A part may be provided. Further, the first and second frames 11 and 12 do not necessarily have to include the cutting suppression portions such as the first and second cutting suppression grooves 27 and 37 and the cutting suppression convex portions 82.

  In the above embodiment, the core outer peripheral protrusion 16c is positioned between the first and second fitting walls 25a and 35a adjacent in the circumferential direction and overlaps the first and second fitting walls 25a and 35a in the circumferential direction. ing. That is, the first and second fitting walls 25a and 35a do not overlap the core outer peripheral protruding portion 16c in the radial direction. However, the first and second fitting walls 25a and 35a may overlap with the core outer protrusion 16c in the radial direction.

  In the above embodiment, the first fitting portion 25 is composed of four first fitting walls 25a, and the second fitting portion 35 is composed of eight second fitting walls 35a. However, the number of first and second fitting walls 25a and 35a constituting the first and second fitting portions 25 and 35 is not limited to this, and may be plural.

  In the above-described embodiment, the first and second fitting portions 25 and 35 are configured by a plurality of first and second fitting walls 25a and 35a that are spaced apart in the circumferential direction. However, the shape of the 1st and 2nd fitting parts 25 and 35 is not restricted to this, What is necessary is just a shape which can insert the edge part of the axial direction of the cyclic | annular part 16a inside radial direction. For example, the first fitting portion 25 (or the second fitting portion 35) can be fitted with the axial end of the annular portion 16a on the radially inner side, and the axial end of the inserted annular portion 16a. One wall having an arc shape along the circumferential direction that can be held radially inward may be used. For example, the 1st and 2nd fitting parts 25 and 35 may comprise an annular shape.

  -The shape of the core outer periphery protrusion part 16c is not restricted to the shape of the said embodiment. The core outer periphery protrusion part 16c should just protrude in the radial direction outer side from the annular part 16a, and may extend along an axial direction so that at least one part of the outer periphery of the through volt | bolt 14 can be enclosed. For example, the core outer periphery protruding portion 16 c may have an annular shape that completely surrounds the outer periphery of the through bolt 14. In this way, since the area of the axial end surface of the core outer peripheral protrusion 16c is increased, the first and second frames 11 and 12 are wider on the axial end surface of the stator core 16 in the pressurizing step. The stator core 16 is abutted and pressed. Further, the axial pressure applied to each of the frames 11 and 12 when the through bolt 14 is tightened can be received by the core outer peripheral protrusion 16c in a wider area. Therefore, when the first and second frames 11 and 12 are pressed toward the stator core 16 in the pressurizing step and the connecting step, the first and second frames 11 and 12 are more difficult to deform.

  In the above embodiment, the stator core 16 includes the four core outer peripheral protrusions 16c. However, the number of core outer peripheral protrusions 16c included in the stator core 16 is not necessarily four, and may be plural.

  In the above embodiment, the first frame 11 and the second frame 12 are fixed to each other by the two through bolts 14. However, the number of through bolts 14 for fixing the first frame 11 and the second frame 12 is not limited to two and may be three or more. In this case, the number of core outer peripheral protrusions 16c of the stator core 16 may be increased according to the number of through bolts 14.

  In the above embodiment, the core sheets 18 at both ends in the axial direction of the stator core 16 have an L-shaped cross section in which the radially inner ends of the portions constituting the teeth 16b are bent outward in the axial direction. However, the stator core 16 may be composed of a plurality of flat core sheets 18 having the same shape.

  In the above embodiment, the stator core 16 is composed of a plurality of core sheets 18 stacked in the axial direction. However, the stator core 16 does not necessarily have to be composed of a plurality of core sheets 18. For example, the stator core 16 may be formed by sintering (sintered body). Further, the stator core 16 may be formed by connecting a plurality of divided cores in the circumferential direction, each having a shape obtained by dividing the annular portion 16a into a plurality in the circumferential direction so as to have the teeth 16b.

In the above embodiment, the stator core 16 includes 60 teeth 16b, but the number of teeth 16b included in the stator core 16 is not limited thereto, and may be appropriately changed.
-In the said embodiment, although a connection process is performed in the middle of a pressurization process, you may perform a connection process after a pressurization process.

  In the above embodiment, the first fitting portion 25 of the first frame 11 and the stator core 16 are fixed by caulking, but may be fixed by a method other than caulking. For example, the first fitting portion 25 of the first frame 11 and the stator core 16 may be fixed by screws or may be fixed by welding. Further, in the arranging step, the first frame 11 and the first fitting portion 25 are not necessarily fixed.

The bearing provided in the motor 10 is not limited to the ball bearings B1 and B2. For example, the motor 10 may be provided with a pair of sliding bearings instead of the ball bearings B1 and B2.
Next, the technical idea that can be grasped from the embodiment and the modified examples will be added below.

  (A) In the motor according to any one of claims 1 to 3, the fitting portion protrudes in an axial direction from the contact surface, and each of the end frames is connected to the centering surface. A motor having a cutting suppression groove extending along an end portion of the centering surface on the contact surface side at a boundary portion with the contact surface.

  According to this configuration, when the inner peripheral surface of the fitting portion is cut to be a centering surface for centering the stator core and the end frame, the cutting surface is used to prevent the contact surface from being cut. Can be suppressed. Therefore, it can suppress that a level | step difference is formed in the contact surface by cutting. Moreover, since the cutting suppression groove | channel is a groove | channel, the end frame which has the said cutting suppression groove | channel can be formed easily.

  (B) In the motor according to any one of claims 1 to 3, the fitting portion protrudes in an axial direction from the abutting surface, and each end frame is connected to the centering surface. A cutting suppression convex portion protruding in an axial direction from the contact surface toward the stator core side and extending along an end portion of the centering surface on the contact surface side at a boundary portion with the contact surface. Characteristic motor.

  According to this configuration, when the inner peripheral surface of the fitting portion is cut so as to be a centering surface for centering the stator core and the end frame, the cutting-suppressing convex portion prevents the contact surface from being cut. Can be suppressed. Therefore, it can suppress that a level | step difference is formed in the contact surface by cutting.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... 1st end frame as an end frame, 12 ... 2nd end frame as an end frame, 14 ... Through bolt, 16 ... Stator core, 16a ... Annular part, 16b ... Teeth, 16c ... Core outer periphery protrusion part , 17 ... coil, 25 ... first fitting portion as a fitting portion, 25a ... first fitting wall as a fitting wall, 25b ... first centering surface as a centering surface, 26 ... as a contact surface 1st contact surface, 27 ... 1st cutting suppression groove | channel as a cutting suppression part, 35 ... 2nd fitting part as a fitting part, 35a ... 2nd fitting wall as a fitting wall, 35b ... Centering 2nd centering surface as a surface, 36 ... 2nd contact surface as a contact surface, 37 ... 2nd cutting suppression groove | channel as a cutting suppression part, 51 ... Rotating shaft, 82 ... Cutting suppression convex as a cutting suppression part , B1, B2 ... Ball bearings as bearings

Claims (6)

An annular stator core, a pair of end frames arranged on both sides of the stator core in the axial direction and holding bearings, a plurality of through bolts fixing the pair of end frames to each other on the outer periphery of the stator core, and the two bearings A rotating shaft supported rotatably on the motor,
The stator core has a ring-shaped annular portion, a plurality of teeth extending radially inward from the annular portion and wound with a coil, and a diameter from the annular portion so as to surround at least a part of the outer periphery of the through bolt. A core outer peripheral protrusion that protrudes outward in the direction and extends along the axial direction,
Each of the end frames has a fitting portion in which an end portion in the axial direction of the annular portion is fitted inward in a radial direction, a planar shape orthogonal to the axial direction, and an end surface in the axial direction of the annular portion and the outer periphery of the core A non-cutting contact surface that is in contact with the axial end surface of the part,
The inner peripheral surface of the fitting portion is a centering surface for centering the stator core and the end frame, and the centering surface is a cutting surface.
The fitting portion protrudes in the axial direction from the contact surface,
The end frame has a groove or a convex portion at a boundary portion between an inner peripheral surface of the fitting portion and the contact surface . The motor according to claim 1,
The motor is characterized in that the fitting portion is composed of a plurality of fitting walls arranged apart from each other in the circumferential direction. The motor according to claim 2,
The motor is characterized in that the core outer peripheral protrusion is located between the fitting walls adjacent in the circumferential direction and overlaps the fitting wall in the circumferential direction. An annular stator core, a pair of end frames arranged on both sides of the stator core in the axial direction and holding bearings, a plurality of through bolts fixing the pair of end frames to each other on the outer periphery of the stator core, and the two bearings And a rotating shaft supported rotatably on the motor,
The stator core includes an annular part having an annular shape, a plurality of teeth extending inward in the radial direction from the annular part, and at least part of the outer periphery of the through bolt disposed on the outer periphery of the stator core. A core outer peripheral protruding portion that protrudes radially outward from the annular portion so as to surround and extends along the axial direction;
Each of the end frames has a fitting portion in which an end portion in the axial direction of the annular portion is fitted radially inward, a planar shape orthogonal to the axial direction, an axial end surface of the annular portion, and the outer periphery of the core A non-cutting contact surface that contacts the axial end surface of the part,
A cutting step for increasing the dimensional accuracy of the inner peripheral surface of the fitting portion by cutting the inner peripheral surface of the fitting portion;
After the cutting step, the axial end of the annular portion is adjusted to the diameter of the fitting portion until the axial end surface of the annular portion and the axial end surface of the core outer peripheral protruding portion contact the contact surface. An arrangement step of arranging the end frame with respect to the stator core while performing centering of the stator core and the end frame by being fitted inside in the direction;
A pressurizing step of pressurizing the pair of end frames toward the stator core after the arranging step;
A connecting step of connecting and fixing the pair of end frames with the through bolts in the middle of the pressing step or after the pressing step ;
The fitting portion protrudes in the axial direction from the contact surface,
The end frame includes a cutting suppressing portion that suppresses cutting of the contact surface in the cutting step at a boundary portion between an inner peripheral surface of the fitting portion and the contact surface. A method for manufacturing a motor. In the manufacturing method of the motor according to claim 4,
The method for manufacturing a motor according to claim 1, wherein the fitting portion includes a plurality of fitting walls that are spaced apart in the circumferential direction. In the manufacturing method of the motor according to claim 5,
In the arranging step, the core outer periphery protruding portion is arranged between the fitting walls adjacent in the circumferential direction and overlaps with the fitting wall in the circumferential direction.

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