JP2018137964A - Motor, and motor manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of easily being assembled.SOLUTION: A motor 10 includes: a stator 13 having a stator core 16 which has a plurality of teeth 16b each extending in a radial direction and armature winding 17 wound on the teeth 16b; a first frame 11 which is formed to cover one end face of the stator 13 in an axial direction; a second frame 12 which is formed to cover one end face of the stator 13 in an axial direction; and a through bolt 14 for joining the first frame 11 the second frame 12 in a state that the stator core 16 held therebetween in the axial direction. In the outer periphery of the stator core 16 and in the outer periphery of the first frame 11 and the second frame 12, circumferential direction positioning concaves 71 to 73 are formed, which are opened outward in a radial direction at positions as the reference in the circumferential direction.SELECTED DRAWING: Figure 3

Description

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

  2. Description of the Related Art Conventionally, a motor includes a stator in which armature windings are wound around teeth of a stator core having a plurality of teeth extending radially inward, and the stator core is axially formed by a first frame and a second frame. As the sandwiched state, there is one in which the first frame and the second frame are fastened with bolts (for example, see Patent Document 1).

JP 2014-147175 A

  By the way, in the motor as described above, it is necessary to position the stator core, the first frame, and the second frame in the circumferential direction during assembly. For example, it may be possible to simply provide a positioning structure that restricts the circumferential rotation of the first frame and the second frame with respect to the stator core. In this case, the axial direction is adjusted while aligning the circumferential positions. It is necessary to move it relative to the assembly. When the positioning structure is not provided, it is necessary to assemble the bolt while holding the stator core, the first frame, and the second frame relative to each other in the axial direction and then holding the same in the circumferential direction. is there. From these things, there existed a problem that an assembly became complicated.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor that can be easily assembled and a method for manufacturing the motor.

  A motor for solving the above problems is provided so as to cover a stator in which armature winding is wound around the teeth of a stator core having a plurality of teeth extending inward in the radial direction, and one axial end surface side of the stator. Fastening member that fastens the first frame and the second frame in a state of sandwiching the stator core in the axial direction, a first frame that is provided so as to cover the other axial end surface side of the stator A circumferential positioning recess that opens radially outward at a reference circumferential position on an outer periphery of the stator core and an outer periphery of at least one of the first frame and the second frame. Is formed.

  According to the same configuration, a circumferential positioning recess is formed on the outer circumference of the stator core and the outer circumference of at least one of the first frame and the second frame. After assembling them in the axial direction, the inserted member can be positioned in the circumferential direction by inserting a jig over the circumferential positioning recesses in the axial direction. Therefore, the fastening member can be easily assembled thereafter.

In the motor, it is preferable that the circumferential positioning recess is formed deeper inward in the radial direction toward the center in the circumferential direction.
According to this configuration, since the circumferential positioning recess is formed deeper in the radial direction toward the center in the circumferential direction, even if the circumferential positioning recess and the jig are slightly displaced in the circumferential direction, the circumferential positioning recess is formed. A jig can be inserted from the outside in the radial direction, and a slight circumferential displacement can be corrected when the jig is inserted.

In the motor, it is preferable that the circumferential positioning recess is formed on an outer periphery of the stator core, an outer periphery of the first frame, and an outer periphery of the second frame.
According to this configuration, the circumferential positioning recesses are formed on the outer periphery of the stator core, the outer periphery of the first frame, and the outer periphery of the second frame. Can be done simultaneously with the tool.

  In the motor, housing recesses that are opened radially outward are formed at equal circumferential intervals in the circumferential direction on the outer periphery of the stator core, and at least one of the housing recesses houses a part of the fastening member. It is preferable that at least one of the receiving recesses be the circumferential positioning recess.

  According to this configuration, since the housing recesses opened radially outward are formed at equal angular intervals in the circumferential direction on the outer periphery of the stator core, a stator core having a good balance (in the same pattern) in the circumferential direction can be obtained. . And since at least 1 of the accommodation recessed part is used as the fastening member accommodation recessed part in which a part of fastening member is accommodated, rotation around a stator core is made | formed. In addition, since at least one of the housing recesses is the circumferential positioning recess, the circumferential positioning can be performed and the assembly can be facilitated.

  In the above motor, the receiving recesses are formed at intervals of 90 degrees, the receiving recesses at intervals of 180 degrees are used as the fastening member receiving recesses, and the receiving recesses at a position spaced 90 degrees from the fastening member receiving recesses. The circumferential positioning recess is preferably used.

  According to this configuration, the receiving recesses are formed at intervals of 90 degrees, the receiving recesses at intervals of 180 degrees are used as the fastening member receiving recesses, and the receiving recesses at a position spaced 90 degrees from the fastening member receiving recesses. Since it is set as the said circumferential direction positioning recessed part, while being able to fasten with sufficient balance, the positioning of the circumferential direction can be performed.

In the above motor, the stator core is preferably in a state in which a stamped and formed stator core sheet is laminated in the axial direction while being rotated 90 degrees.
According to this configuration, the stator core is in a state where the stamped and molded stator core sheets are stacked in the axial direction while being rotated by 90 degrees, and therefore, the stator core should be a balanced stator core in the axial direction and the circumferential direction. Can do. In other words, while making the stator core well balanced in the axial direction and the circumferential direction, the core can be fastened in a well-balanced manner and positioned in the circumferential direction.

  A method of manufacturing a motor that solves the above problem includes a stator in which an armature winding is wound around the teeth of a stator core having a plurality of teeth extending inward in the radial direction, and an axial end face side of the stator. The first frame provided in this manner, the second frame provided so as to cover the other axial end surface side of the stator, and the first frame and the second frame sandwiched in the axial direction of the stator core A fastening member, and a first frame, the stator core, and the second frame are relatively moved in the axial direction and assembled in the axial direction, and then the outer periphery of the stator core; A jig extending in the axial direction in a circumferential positioning recess formed on the outer periphery in the radial direction formed on at least one outer periphery of the first frame and the second frame Insert, fastening the second frame and the first frame at the fastening member in that state.

  According to the method, the first frame, the stator core, and the second frame are relatively moved in the axial direction and assembled in the axial direction, and thereafter, the outer periphery of the stator core and the outer periphery of at least one of the first frame and the second frame. By inserting a jig across the axial direction into the formed circumferential positioning recess opened radially outward, and fastening the first frame and the second frame with the fastening member in that state, the motor can be easily Can be assembled.

  In the motor and the motor manufacturing method of the present invention, assembly can be facilitated.

1 is a schematic cross-sectional view showing a schematic configuration of a motor in one embodiment. The exploded perspective view of the motor in one embodiment. (A) is a side view of the motor in one embodiment, (b) is a sectional view of the motor. 1 is a partial cross-sectional view of a motor in one embodiment. Sectional drawing of the motor in one Embodiment. 1 is a partially enlarged perspective view of a motor according to an embodiment. Sectional drawing of the insulating member in one Embodiment. The top view of the insulating member in one Embodiment.

Hereinafter, an embodiment will be described with reference to FIGS.
As shown in FIG. 1, the motor 10 has a configuration in which an annular stator 13 is sandwiched between a first frame 11 and a second frame 12 in the rotation axis direction. The first frame 11 and the second frame 12 are fixed (fastened) to each other by a plurality of (two in the present embodiment) through bolts 14 disposed 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 an armature winding 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 armature winding 17 is a distributed winding wound around the plurality of teeth 16b. The armature windings 17 are provided for three phases (U phase, V phase, W phase), and each segment conductor is configured to be connected at an axial end. Further, the armature winding 17 is provided such that each winding end portion 17 a (see FIG. 2) extends to one end side in the axial direction and penetrates the first frame 11. Specifically, one end portion 17a of the armature winding 17 of each phase (three) is provided so as to constitute one group Z1 and extend to one end side in the axial direction at a position close to the circumferential direction. The other end portion 17a of the armature winding 17 of each phase constitutes the other group Z2 at a position close to the circumferential direction, and is one end side in the axial direction at a position 180 degrees away from the one group Z1. It is provided so that it may extend.

  As shown in FIGS. 3 (a), 4 and 5, the winding end portion 17a (one group Z1 and the other group Z2) in the first frame 11 is a position through which it is 180 degrees. An insulating member R is fixed at the interval. The insulating member R has a through hole Ra (see FIG. 4) in a state of being pierced by the distal end portion 17b of the winding end portion 17a. The insulating member R is made of a rubber material.

  Specifically, as shown in FIGS. 7 and 8, the insulating member R in a state immediately after being formed does not have the through hole Ra and is fitted into the fitting hole 11 a of the first frame 11. It has a cylindrical portion Rb, a thin portion Rc that closes one end of the cylindrical portion Rb, and a flange portion Rd that extends outward from one end of the cylindrical portion Rb. The thin-walled portion Rc is a portion (a portion where the through-hole Ra is to be formed) that will later be pierced by the tip end portion 17b of the winding end portion 17a, and is an axial direction (a pierced direction). The thickness is thinner than other parts (flange portion Rd and the like). In addition, an inclined surface Re is formed on the inner surface of the tubular portion Rb so as to guide the tip portion 17b of the winding end portion 17a to the thin portion Rc. Further, a return portion Rf is formed on the outer surface of the cylindrical portion Rb so as to make it difficult to come out of the fitting hole 11a.

  As shown in FIGS. 4 and 7, the tip end portion 17b of the winding end portion 17a is formed in a sharp shape. In addition, the front-end | tip part 17b of the coil | winding edge part site | part 17a of this embodiment is formed in the sharp shape by having one inclined plane.

  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 peripheral protrusion 16c is formed along the axial direction from one end to the other end of the annular portion 16a in the axial direction. Each core outer protrusion 16c has an arc recess 16d as a receiving recess that is recessed from the distal end (radially outer end) to the base end of each core outer protrusion 16c and opens radially outward. Is formed. The arc recess 16d is formed deeper in the radial direction toward the center in the circumferential direction, and the shape seen from the axial direction forms an arc shape and has a groove shape penetrating the core outer periphery 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 the circular arc recessed part 16d provided in two places (two places of right and left in FIG.3 (b)) which are 180 degree intervals in the circumferential direction among the four core outer periphery protrusion parts 16c is substantially cylindrical shape extended in an axial direction. It is set as the fastening member accommodation recessed part 16e arrange | positioned so that a part (less than half) of the through bolt 14 which comprises may be accommodated.

  As shown in FIG. 1, the stator core 16 is formed by laminating and integrating a plurality of stator core sheets 18 in a state of being punched and formed from an electromagnetic steel sheet by pressing. At this time, in this embodiment, the stator core sheet 18 that has been stamped and formed in the same process is laminated in the axial direction while rotating 90 degrees, so that, for example, minute distortion or residual stress of the electromagnetic steel sheet material is axially In addition, the stator core 16 is well balanced by being distributed in a balanced manner in the circumferential direction. Further, the end core sheets 66 laminated at both axial end portions of the stator core 16 have an L-shaped cross section provided with a rotor facing portion 65 as an axially extending portion extending radially outward on the radially inner side. It is made into a shape.

  Accordingly, the axial length of the radially inner end face 16f (the face facing the rotor 15) of the teeth 16b is suppressed while keeping the stack thickness of the stator core 16 (the thickness of the stacked stator core sheet 18 and the end core sheet 66 as a whole) small. It is possible to ensure this. In FIG. 3A, the stator core sheet 18 is omitted and the stator core 16 is shown in a simplified manner.

  As shown in FIGS. 1 and 2, the first frame 11 and the second frame 12 that are disposed on both sides of the stator core 16 in the axial direction and are provided so as to cover the opposing end surfaces of the stator core 16 are made of a metal material. It is 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). Each first bolt fastening portion 23 is formed with a first fastening hole 23a (see FIG. 2) through which the through bolt 14 is inserted, and each second bolt fastening portion 33 is screwed with the through bolt 14. A female screw-like second fastening hole 33a (see FIG. 3B) is formed. 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 located between the first fitting walls 25a adjacent in the circumferential direction and overlaps with the first fitting walls 25a in the circumferential direction (alternately). 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 protruding portion 16c is positioned between the second fitting walls 35a adjacent in the circumferential direction and overlaps with the second fitting walls 35a in the circumferential direction (every two). 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. 1, 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 are the first and second frames. First and second centering surfaces 25b and 35b for centering the stator cores 11 and 12 and the stator core 16 are provided.

  The first and second frames 11 and 12 are adjacent to the base end portions of the first and second fitting portions 25 and 35 in a direction orthogonal to the central axis of the first and second stator holding portions 22 and 32. The first and second contact surfaces 26 and 36 are provided. Then, one end surface (the upper end surface in FIG. 1) of the annular portion 16a fitted in the first fitting portion 25 is in contact with the first contact surface 26 in the axial direction. Further, the other end surface (the lower end surface in FIG. 1) of the annular portion 16 a fitted in the second fitting portion 35 is in contact with the second contact surface 36 in the axial direction. In this state, the first frame 11 and the second frame 12 are fixed (fastened) to each other with 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.

  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 knurled portion 51a at the center of the rotating shaft 51 so as to be integrally rotatable, and an outer surface of the rotor core 52 A plurality of permanent magnets 53 are arranged in the circumferential direction so as to be in contact with each other, and a cylindrical nonmagnetic cover 54 that covers and holds the outer surface of each permanent magnet 53. Each permanent magnet 53 is opposed to the inner peripheral surface of the stator core 16 (the radially inner end surface 16f of the teeth 16b) via the nonmagnetic cover 54 in the radial direction. The front end portion (the 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 second frame 12 and to the outside of the motor 10. A joint 55 (see FIG. 2) as a part is attached. Further, the base end portion (upper end portion in FIG. 1) of the rotating shaft 51 passes through the through hole 29 a and protrudes to the outside of the first frame 11, and the protruding portion has a disk shape via a fixing member 56. A sensor magnet 57 is fixed.

  As shown in FIGS. 1 and 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. Various elements including a magnetic sensor 63 a facing the sensor magnet 57 are mounted on the circuit board 63. Further, the tip end portion 17b of the winding end portion 17a 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 armature winding 17 via the circuit board 63, so that the rotor 15 rotates.

  Here, on the outer periphery of the stator core 16 of the present embodiment and the outer periphery of the first frame 11 and the second frame 12, circumferential positioning recesses 71 to 73 opened radially outward at the reference circumferential position are formed. Has been.

  Specifically, as shown in FIGS. 3 (a), 3 (b) and 5, first, it is one of the circular arc recesses 16d of the stator core 16, and is 90 degrees apart from the fastening member receiving recess 16e. One circular arc recess 16d at the above position is a circumferential positioning recess 71.

  As shown in FIGS. 2, 3A, and 4, the circumferential positioning recess 72 of the first frame 11 is the same as the circumferential positioning recess 71 of the stator core 16 that is continuous (extended) in the axial direction. It is formed so as to form a concave portion.

  Further, as shown in FIGS. 3A and 4, the circumferential positioning recess 73 of the second frame 12 is a recess having the same shape as the circumferential positioning recess 71 of the stator core 16 that is continuous (extended) in the axial direction. It is formed to become.

  Thus, after the stator core 16, the first frame 11, and the second frame 12 are assembled in the axial direction (by roughly positioning in the circumferential direction), the circumferential positioning recesses 71 to 73 are straddled in the axial direction. By inserting a single jig 74, it is possible to position the inserted member in the circumferential direction (relative) with high accuracy. The jig 74 is formed in an arc shape when viewed from the axial direction so that the tip is accommodated in the circumferential positioning recesses 71 to 73 with almost no gap, and the axial length of the jig 74 is that of the circumferential positioning recesses 71 to 73. It is set to a series of lengths or less.

  Further, as shown in FIG. 5, the stator core 16 and the first frame 11 of the present embodiment are misassembled so that the axial assembly can be performed only at positions where the relative positions in the circumferential direction are set in advance. An extending portion 81 and a convex portion 82 are provided as restricting portions.

  That is, in the present embodiment, one group Z1 and the other group Z2 of the winding end portion 17a are arranged 180 degrees apart from each other, and the extending portion 81 and the convex portion 82 are not provided. Then, there is a possibility that the stator 13 is erroneously assembled to the first frame 11 at a relative position that is wrong by 180 degrees. In order to make this impossible, an extension part 81 and a convex part 82 are provided. .

  Specifically, the extension portion 81 of the stator core 16 is provided only on the end core sheet 66, and from two core outer peripheral protrusions 16c adjacent to each other in the circumferential direction of the end core sheet 66 (at intervals of 90 degrees). It further extends outward in the radial direction.

Further, the projecting portion 82 of the first frame 11 is projected in the axial direction so as to collide with the extending portion 81 in the axial direction at a position other than the preset position so as to make the assembly in the axial direction impossible.
That is, when the stator 13 (the stator core 16) is assembled so that the winding end portion 17a penetrates the insulating member R at a relative position where the stator 13 (stator core 16) is mistaken by 180 degrees with respect to the first frame 11, The part 81 collides in the axial direction to prevent assembly in the axial direction.

  As shown in FIGS. 5 and 6, the winding end portion 17 a penetrates the insulating member R at a normal position where the stator 13 (stator core 16) is preset with respect to the first frame 11. When assembled in this manner, the extending portion 81 and the convex portion 82 do not collide with each other, and the axial assembly is allowed.

Next, the manufacturing method and operation of the motor 10 configured as described above will be described.
The method for manufacturing the motor 10 of the present embodiment includes a step of fixing the insulating member R at a position where the winding end portion 17a in the first frame 11 is penetrated (the fitting hole 11a is formed). . In addition, the manufacturing method of the motor 10 is such that the first frame 11 and the stator 13 (stator core 16) are relatively moved in the axial direction, and the insulating member R (the thin wall of the insulating member R is formed at the tip end portion 17b of the winding end portion 17a. A step of breaking through the portion Rc) to form the through hole Ra in the insulating member R and providing the winding end portion 17a so as to penetrate the first frame 11 is included. As a result, the tip end portion 17b of the winding end portion 17a is led out of the first frame 11, and can be electrically connected to the circuit board 63 later.

  Further, in the method of manufacturing the motor 10 of the present embodiment, the first frame 11, the stator core 16 and the second frame 12 are relatively moved in the axial direction and assembled in the axial direction, and then the outer periphery of the stator core 16 and the first frame 11 are assembled. And a step of inserting the jig 74 across the axial direction into the circumferential positioning recesses 71 to 73 formed on the outer periphery of the second frame 12. In this state, the first frame 11 and the second frame 12 are fastened with the through-bolt 14 sandwiching the stator core 16 in the axial direction. Thereby, for example, the stator core 16 and the second frame 12 are slightly displaced in the circumferential direction, and the through bolt 14 collides with the second bolt fastening portion 33 without being inserted into the second fastening hole 33 a of the second frame 12. Is prevented.

Next, the effect of the said embodiment is described below.
(1) On the outer periphery of the stator core 16 and the outer periphery of the first frame 11 and the second frame 12, circumferential positioning recesses 71 to 73 that are opened radially outward at the reference circumferential position are formed. Therefore, after assembling them in the axial direction, it is possible to position and hold the inserted member in the circumferential direction by inserting the jig 74 across the axial positioning recesses 71 to 73 in the circumferential direction. . In the present embodiment, the circumferential positioning of all members of the stator core 16, the first frame 11, and the second frame 12 can be performed simultaneously with one jig 74. Therefore, the through bolt 14 can be easily assembled thereafter.

  (2) The circumferential positioning recesses 71 to 73 are formed deeper inward in the radial direction toward the center in the circumferential direction (having an arc shape). Therefore, even if the circumferential positioning recesses 71 to 73 and the jig 74 are slightly displaced in the circumferential direction, the jig 74 can be inserted into the circumferential positioning recesses 71 to 73 from the outside in the radial direction. A slight misalignment in the circumferential direction can be corrected when inserting the.

  (3) On the outer periphery of the stator core 16, arc concave portions 16d opened radially outward are formed at equal angular intervals in the circumferential direction, so that the stator core 16 having a good balance (in the same pattern) in the circumferential direction can be obtained. . Then, since the two arc recesses 16d are fastening member receiving recesses 16e in which a part of the through bolts 14 are received, the periphery of the stator core 16 is stopped. Further, since one of the circular arc recesses 16d is the circumferential positioning recess 71, positioning in the circumferential direction can be performed and assembly can be facilitated.

  (4) The arc recesses 16d are formed at intervals of 90 degrees, the arc recesses 16d at intervals of 180 degrees serve as the fastening member receiving recesses 16e, and the arc recesses 16d at positions spaced 90 degrees from the fastening member receiving recesses 16e. Therefore, the circumferential positioning recess 71 can be fastened in a well-balanced manner and can be positioned in the circumferential direction.

  (5) Since the stator core sheet 18 in the stamped and molded state is in a state of being laminated in the axial direction while being rotated 90 degrees, the stator core 16 is balanced in the axial direction and the circumferential direction. Can do. In other words, while the stator core 16 having a good balance in the axial direction and the circumferential direction can be fastened with a good balance, positioning in the circumferential direction can be performed.

  In other words, in this embodiment, the arc recess 16d is formed every 90 degrees in order to stack the stator core sheet 18 in the axial direction while being rotated 90 degrees and to accommodate a part of the through bolt 14, and the arc By using one of the concave portions 16d as the circumferential positioning concave portion 71, positioning can be performed while the stator core 16 is well balanced.

The above embodiment may be modified as follows.
In the above embodiment, the circumferential positioning recesses 71 to 73 are formed deeper inward in the radial direction toward the center in the circumferential direction (in the shape of an arc), but are not limited thereto. It is good also as shapes other than the circular arc shape deeply formed in radial inside, and good also as a circumferential direction positioning recessed part with constant depth.

  In the above-described embodiment, the circular arc recesses 16d are formed on the outer periphery of the stator core 16 at equal intervals (90 degrees) in the circumferential direction. The housing recess 16e and one of the arc recesses 16d are the circumferential positioning recess 71. However, the configuration is not limited to this, and other configurations may be employed. For example, the stator core 16 is in a state where the stator core sheet 18 is stacked in the axial direction while being rotated 90 degrees, but without being stacked while being rotated, the fastening member receiving recess 16e and the circumferential positioning recess 71 are provided. The formed angular interval may be changed to another angular interval. For example, the circumferential positioning recess 71 may be provided at a position separated from the fastening member housing recess 16e at an angle other than 90 degrees.

  In the above embodiment, the circumferential positioning recesses 71 to 73 are formed on the outer periphery of the stator core 16 and the outer periphery of the first frame 11 and the second frame 12. You may make it form in an outer periphery and the outer periphery of any one of the 1st frame 11 and the 2nd frame 12. In this case, the other of the first frame 11 and the second frame 12 cannot be positioned in the circumferential direction with the same jig 74, but either the stator core 16, the first frame 11, or the second frame 12. Positioning with one can be performed. Therefore, in this case, for example, the through bolt 14 can be easily assembled while holding the other circumferential position of the first frame 11 and the second frame 12 by means other than the jig 74, for example. Can do.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... 1st frame, 12 ... 2nd frame, 13 ... Stator, 14 ... Through bolt (fastening member), 16 ... Stator core, 16b ... Teeth, 16d ... Arc recessed part (accommodating recessed part), 16e ... Fastening member Housing recess, 17 ... armature winding, 18 ... stator core sheet, 71-73 ... circumferential positioning recess, 74 ... jig.

Claims (7)

A stator in which an armature winding is wound around the teeth of the stator core having a plurality of teeth extending inward in the radial direction;
A first frame provided so as to cover one axial end surface side of the stator;
A second frame provided so as to cover the other axial end surface side of the stator;
A motor comprising a fastening member for fastening the first frame and the second frame in a state of sandwiching the stator core in the axial direction;
The outer periphery of the stator core and the outer periphery of at least one of the first frame and the second frame are formed with a circumferential positioning recess that opens radially outward at a reference circumferential position. motor. The motor according to claim 1,
The motor according to claim 1, wherein the circumferential positioning recess is formed deeper inward in the radial direction toward the center in the circumferential direction. The motor according to claim 1 or 2,
The circumferential positioning recess is formed on an outer periphery of the stator core, an outer periphery of the first frame, and an outer periphery of the second frame. The motor according to any one of claims 1 to 3,
On the outer periphery of the stator core, receiving recesses opened radially outward are formed at equal angular intervals in the circumferential direction,
At least one of the accommodation recesses is a fastening member accommodation recess in which a part of the fastening member is accommodated,
At least one of the housing recesses is the circumferential positioning recess. The motor according to claim 4,
The accommodating recesses are formed at intervals of 90 degrees,
The housing recesses at intervals of 180 degrees are the fastening member housing recesses,
The motor according to claim 1, wherein the housing recess at a position 90 degrees apart from the fastening member housing recess is the circumferential positioning recess. The motor according to claim 5,
The stator core is a motor in which a stamped and formed stator core sheet is laminated in the axial direction while being rotated by 90 degrees. A stator in which an armature winding is wound around the teeth of the stator core having a plurality of teeth extending inward in the radial direction;
A first frame provided so as to cover one axial end surface side of the stator;
A second frame provided so as to cover the other axial end surface side of the stator;
A method of manufacturing a motor comprising a fastening member that fastens the first frame and the second frame in a state of sandwiching the stator core in the axial direction,
Assembling the first frame, the stator core, and the second frame in the axial direction by relatively moving in the axial direction;
Then, a jig is inserted across the axial direction in a circumferential positioning recess that is opened radially outwardly on the outer periphery of the stator core and at least one of the outer periphery of the first frame and the second frame,
In this state, the first frame and the second frame are fastened by a fastening member.

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