JP6874418B2 - motor - Google Patents

Description

The present invention relates to a motor.

Conventionally, a motor includes a stator in which an armature winding is wound around teeth of a stator core having a plurality of teeth extending inward in the radial direction, and the stator core is axially formed by a first frame and a second frame. In the sandwiched state, the first frame and the second frame are fastened with bolts (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-147175

By the way, in the above-mentioned motor, for example, when the group of winding end portions in the armature winding of the stator is arranged 180 degrees apart, the stator is arranged with respect to the first frame and the second frame. There was a risk that it would be erroneously assembled at a relative position in the circumferential direction that was wrong by 180 degrees. It should be noted that such erroneous assembly causes a group of winding end portions to be erroneously connected to other electric circuit parts, which in turn causes defective products.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor capable of suppressing erroneous assembly.

A motor that solves the above problems is 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 a plurality of accommodating recesses in the circumferential direction opening outward in the radial direction. A state in which the stator core is axially sandwiched between a first frame provided so as to cover one end surface side in the axial direction of the stator, a second frame provided so as to cover the other end surface side in the axial direction of the stator, and the stator core. A motor that fastens the first frame and the second frame and includes a fastening member that is partially accommodated in at least one fastening member accommodating recess among the plurality of accommodating recesses. the first frame and at least one of the second frame is restricting portion erroneous assembly that allows assembly of the axial direction is provided only at a position where one another in the circumferential direction of the relative position has been set in advance The misassembling restricting portion of the stator core is an extending portion extending radially outward from a part in the circumferential direction, and the misassembling restricting portion of at least one of the first frame and the second frame. Is a convex portion that is projected in the axial direction so as to collide with the extending portion in the axial direction at a position other than the preset position .

According to the same configuration, the stator core and at least one of the first frame and the second frame are erroneously assembled so that they can be assembled in the axial direction only at positions where the relative positions in the circumferential direction of each other are set in advance. Since the portion is provided, the assembly in the axial direction other than the position where the relative position in the circumferential direction is set in advance, that is, the erroneous assembly is suppressed.
According to the same configuration, the misassembly restricting portion of the stator core is an extension portion extending radially outward from a part in the circumferential direction, and the misassembly of at least one of the first frame and the second frame. Since the regulating part is a convex part that is projected in the axial direction so as to collide with the extending part in the axial direction at a position other than the preset position, it is possible to specifically suppress erroneous assembly by colliding with them. it can.

In the motor, the armature winding is composed of a large number of segment conductors, and the winding end portion thereof is provided so as to extend to one end side in the axial direction and penetrate the first frame. It is preferable that the group of the line end portions is arranged 180 degrees apart.

According to the same configuration, the armature winding is composed of a large number of segment conductors, and the winding end portion thereof is provided so as to extend to one end side in the axial direction and penetrate the first frame. Since the groups of the parts are arranged 180 degrees apart, the stator is likely to be erroneously assembled at a position relative to the first frame by 180 degrees, but this can be avoided.

In the motor, the stator core is in a state in which stator core sheets are laminated, and the misassembly restricting portion of the stator core is provided only on the end core sheet laminated on the axial end portion. Is preferable.

According to the same configuration, the misassembly restricting portion of the stator core is provided only on the end core sheet laminated on the axial end portion, so that the other stator core sheets have a simple shape that repeats the same pattern in the circumferential direction. Can be.

In the motor of the present invention, erroneous assembly can be suppressed.

FIG. 6 is a schematic cross-sectional view showing a schematic configuration of a motor according to an embodiment. An exploded perspective view of the motor in one embodiment. (A) is a side view of the motor in one embodiment, and (b) is a cross-sectional view of the motor. Partial sectional view of the motor in one embodiment. Sectional drawing of the motor in one Embodiment. Partially enlarged perspective view of the motor in one embodiment. Sectional drawing of the insulating member in one Embodiment. The plan view of the insulating member in one Embodiment.

Hereinafter, one embodiment will be described with reference to FIGS. 1 to 8.
As shown in FIG. 1, the motor 10 has a configuration in which an annular stator 13 is sandwiched between the first frame 11 and the second frame 12 in the direction of the rotation axis. The first frame 11 and the second frame 12 are fixed (fastened) to each other by through bolts 14 as fastening members (two in the present embodiment) arranged on the outer periphery of the stator 13. Further, the rotor 15 is rotatably arranged inside the stator 13. In the present embodiment, the end frame that holds the stator 13 on the axially opposite output side (upper side in FIG. 1) of the motor 10 is the first frame 11, and the end frame that holds the stator 13 on the axial output side is the first frame. It is set to 2 frames 12.

As shown in FIGS. 1 and 2, the stator 13 has 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 forming an annular shape, a plurality of teeth 16b extending radially inward from the annular portion 16a and arranging in the circumferential direction (60 in the present embodiment). It is composed of four core outer peripheral protrusions 16c that protrude outward in the radial direction from the outer peripheral surface of the annular portion 16a and extend along the axial direction. The outer peripheral surface of the annular portion 16a has a cylindrical shape, and both end surfaces of the annular portion 16a in the axial direction have a planar shape orthogonal to the axial direction. Further, the armature winding 17 is a distributed winding wound over a plurality of teeth 16b. Further, the armature winding 17 is provided for three phases (U phase, V phase, W phase), and each of them is configured by connecting a large number of segment conductors at the axial end portions. Further, the armature winding 17 is provided so that each winding end portion 17a (see FIG. 2) extends to one end side in the axial direction and penetrates the first frame 11. Specifically, one winding end portion 17a of each phase (three) armature windings 17 is provided so as to form one group Z1 at a position close to the circumferential direction and extend to one end side in the axial direction. , The other winding 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 180 degrees away from one group Z1 on one end side in the axial direction. It is provided so as to extend to.

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

Specifically, as shown in FIGS. 7 and 8, the insulating member R in the state immediately after being molded does not have the through hole Ra and is fitted into the fitting hole 11a of the first frame 11. It has a tubular portion Rb, a thin-walled portion Rc that closes one end of the tubular portion Rb, and a flange portion Rd that extends outward from one end of the tubular portion Rb. The thin-walled portion Rc is a portion (a portion where the through hole Ra is formed) that will be pierced by the tip portion 17b of the winding end portion 17a later, and is a meat in the axial direction (direction of piercing). The thickness is formed thinner than other parts (flange portion Rd, etc.). Further, 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-walled portion Rc. Further, a return portion Rf is formed on the outer surface of the tubular portion Rb to prevent the tubular portion Rb from coming off from the fitting hole 11a.

Further, as shown in FIGS. 4 and 7, the tip portion 17b of the winding end portion portion 17a is formed in a sharp shape. The tip portion 17b of the winding end portion portion 17a of the present embodiment is formed in a sharp shape by having one inclined flat surface.

As shown in FIGS. 3A and 3B, the core outer peripheral protrusions 16c are provided at four locations having equal intervals (90 ° intervals in the present embodiment) in the circumferential direction on the outer peripheral surface of the annular portion 16a. It is provided in. 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. Further, each core outer peripheral protrusion 16c has an arc recess 16d as a storage recess that is recessed from the tip (diametrically outer end) of each core outer peripheral protrusion 16c toward the base end and opens radially outward. It is formed. The arcuate recess 16d is formed deeper in the radial direction toward the center in the circumferential direction, and has an arcuate shape when viewed from the axial direction and a groove shape which penetrates the core outer peripheral protrusion 16c in the axial direction. .. The radius of curvature of the arc recess 16d is slightly larger than the radius of the male screw-shaped portion of the through bolt 14. Of the four core outer peripheral protrusions 16c, the arc recesses 16d provided at two locations (two locations on the left and right in FIG. 3B) at intervals of 180 ° in the circumferential direction are substantially columnar extending in the axial direction. It is a fastening member accommodating recess 16e arranged so as to accommodate a part (half or less) of the through bolt 14 forming the above.

As shown in FIG. 1, the stator core 16 is formed by laminating and caulking a plurality of stator core sheets 18 in a state of being formed by punching an electromagnetic steel plate material by press working. At this time, in the present embodiment, by laminating the stator core sheet 18 in the state of being punched and molded in the same process in the axial direction while rotating it by 90 degrees, for example, minute strain and residual stress of the electromagnetic steel plate material can be subjected to the axial direction. And the stator core 16 is well-balanced by being dispersed in the circumferential direction in a well-balanced manner. Further, the end core sheet 66 laminated on both ends in the axial direction of the stator core 16 has an L-shaped cross section provided with a rotor facing portion 65 as an axially extending portion extending radially inward and axially outward. It is said to be in shape.

Therefore, while keeping the stacking thickness of the stator core 16 (the thickness of the laminated stator core sheet 18 and the end core sheet 66 as a whole) small, the axial length of the radial inner end surface 16f (opposing surface to the rotor 15) of the teeth 16b. It is possible to secure the size. In FIG. 3A, the stator core sheet 18 is omitted to simplify the stator core 16.

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 and provided so as to cover the opposite end faces of the stator core 16 are made of a metal material. , Formed by casting. The first and second frames 11 and 12 have a substantially disk-shaped first and second main body portions 21 and 31, and a cylindrical first body extending axially from the first and second main body portions 21 and 31. The second stator holding portions 22 and 32 are provided, respectively. Further, a plurality of first and second frames 11 and 12 are 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 (in the present embodiment). It is provided with first and second bolt fastening portions 23 and 33 (two each). The first and second bolt fastening portions 23 and 33 are provided at equal angular intervals (180 ° intervals in this embodiment) in the circumferential direction. Further, 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-shaped second fastening hole 33a (see FIG. 3B) to be combined 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 a through bolt 14 that penetrates the first fastening hole 23a and is screwed into the second fastening hole 33a. 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 extends radially outward from two locations deviated in the circumferential direction from the two second bolt fastening portions 33 in the second main body portion 31. The motor 10 is fixed at a fixed place so that the second frame 12 is located below the first frame 11, for example.

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

The first fitting portion 25 is composed of a plurality of (four in the present embodiment) first fitting walls 25a arranged apart from each other in the circumferential direction. The four first fitting walls 25a are provided at equal angular intervals (90 ° intervals in this 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 to each other in the circumferential direction. That is, the core outer peripheral protrusion 16c is located between the first fitting walls 25a adjacent to each other in the circumferential direction and overlaps the first fitting wall 25a in the circumferential direction (alternately). The core outer peripheral protrusion 16c does not overlap with the first fitting wall 25a in the radial direction. Further, the second fitting portion 35 is composed of a plurality of (eight in this embodiment) second fitting walls 35a arranged apart from each other in the circumferential direction. The second fitting wall 35a is arranged on both sides of each core outer peripheral protrusion 16c in the circumferential direction (that is, two each between the core outer peripheral protrusions 16c adjacent to each other in the circumferential direction). That is, the core outer peripheral protrusion 16c is located between the second fitting walls 35a adjacent to each other in the circumferential direction and overlaps the second fitting wall 35a in the circumferential direction (every other). The core outer peripheral protrusion 16c does not overlap with the second fitting wall 35a in the radial direction.

The first and second fitting portions 25, 35 (first and second fitting walls 25a, 35a) are thicker in the radial direction than the proximal end side portions of the first and second stator holding portions 22, 32. Is formed thinly. Further, the first and second fitting walls 25a and 35a extend in parallel with the axial direction and form an arc shape along the circumferential direction when viewed from the axial direction. Further, the width of each of the first and second fitting walls 25a and 35a in the circumferential direction becomes narrower from the base end toward the tip end (end end on the tip 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 and 35, that is, the radial inner side surfaces of the first and second fitting walls 25a and 35a, respectively, are the first and second frames. The first and second centering surfaces 25b and 35b for centering the 11 and 12 and the stator core 16 are provided.

Further, 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 axes of the first and second stator holding portions 22 and 32. It has first and second contact surfaces 26, 36. Then, one end surface (upper end surface in FIG. 1) in the axial direction of the annular portion 16a fitted into the first fitting portion 25 is in axial contact with the first contact surface 26. Further, the other end surface (lower end surface in FIG. 1) of the annular portion 16a fitted in the second fitting portion 35 in the axial direction is in axial contact with the second contact surface 36. In this state, the first frame 11 and the second frame 12 are fixed (fastened) to each other by the through bolt 14 while sandwiching the stator 13 between the first and second stator holding portions 22 and 32.

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

A bearing accommodating portion 29 is formed in the central portion of the first main body portion 21 so that the ball bearing B1 can be assembled from the stator 13 side (internal side of the motor 10) in the axial direction. The bearing accommodating portion 29 has a circular shape in the axial direction, and its inner peripheral surface has a cylindrical shape extending in the axial direction. Further, the central axis of the bearing accommodating 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 the annular ball bearing B1 in the bearing accommodating portion 29. Further, a through hole 29a is formed in the center of the bottom portion of the bearing accommodating portion 29 so as to penetrate the bottom portion of the bearing accommodating portion 29 in the axial direction. Then, the ball bearing B1 is axially urged toward the stator 13 between the radial outer portion of the through hole 29a at the bottom of the bearing accommodating portion 29 and the ball bearing B1 accommodated in the bearing accommodating portion 29. A wave washer 41 is interposed.

A bearing accommodating portion 40 for accommodating and holding the annular ball bearing B2 is recessed in the central portion of the second main body portion 31. The bearing accommodating portion 40 has a concave shape that is recessed from the axially outer end surface of the second frame 12 to the inner side (stator 13 side) of the motor 10. That is, the bearing accommodating portion 40 is formed so that the ball bearing B2 can be assembled from the outer side (opposite side to the stator 13) of the motor 10. Further, the central axis of the bearing accommodating portion 40 coincides with the central axis of the second stator holding portion 32 (the central axis of the second fitting portion 35). Then, the second frame 12 holds the ball bearing B2 arranged in the bearing accommodating portion 40 so as to be coaxial with the ball bearing B1 held in the first frame 11. Further, the ball bearing B2 is positioned in the axial direction by abutting the bottom portion of the bearing accommodating portion 40 from the axial direction. A through hole 40a is formed in the center of the bottom portion of the bearing accommodating portion 40 so as to penetrate the bottom portion of the bearing accommodating portion 40 in the axial direction.

The rotor 15 includes a rotating shaft 51 rotatably supported by ball bearings B1 and B2, a cylindrical rotor core 52 rotatably fixed to a lorlet portion 51a at the center of the rotating shaft 51, and an outer surface of the rotor core 52. It is provided with a plurality of permanent magnets 53 arranged so as to be in contact with the permanent magnets 53, and a tubular non-magnetic cover 54 that covers and holds the outer surface of each permanent magnet 53. Each permanent magnet 53 is radially opposed to the inner peripheral surface of the stator core 16 (the radial inner end surface 16f of the teeth 16b) via the non-magnetic cover 54. The tip end portion (lower end portion in FIG. 1) of the rotating shaft 51 penetrates 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 portion is attached. Further, the base end portion (upper end portion in FIG. 1) of the rotating shaft 51 penetrates the through hole 29a and protrudes to the outside of the first frame 11, and the protruding portion has a disk shape via the fixing member 56. The sensor magnet 57 is fixed.

As shown in FIGS. 1 and 2, the 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 housed inside the cover 62. Various elements including a magnetic sensor 63a and the like facing the sensor magnet 57 are mounted on the circuit board 63. Further, the tip portion 17b of the winding end portion 17a is electrically connected to the circuit board 63. Further, a connector portion 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 portion 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, 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 are formed with circumferential positioning recesses 71 to 73 that are radially outwardly open at reference circumferential positions. Has been done.

Specifically, as shown in FIGS. 3 (a), 3 (b) and 5, first, it is one of the arc recesses 16d of the stator core 16 and is separated from the fastening member accommodating recess 16e by 90 degrees. One arc recess 16d at the right-angled position is a circumferential positioning recess 71.

Further, as shown in FIGS. 2, 3 (a), and 4, the circumferential positioning recess 72 of the first frame 11 is axially continuous (extended) with the circumferential positioning recess 71 of the stator core 16. It is formed so as to be a concave portion in the shape.

Further, as shown in FIGS. 3A and 4, the circumferential positioning recess 73 of the second frame 12 has 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 so as to be.

As a result, after the stator core 16, the first frame 11, and the second frame 12 are assembled in the axial direction (roughly positioning in the circumferential direction), they straddle the circumferential positioning recesses 71 to 73 in the axial direction. By inserting a single jig 74, it is possible to perform (relative) positioning of the inserted member in the circumferential direction with high accuracy. The jig 74 is formed in an arc shape when viewed from the axial direction so that the tip thereof is accommodated in the circumferential positioning recesses 71 to 73 with almost no gap, and the axial length is 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 erroneously assembled so that they can be assembled in the axial direction only at positions where the relative positions in the circumferential direction of each other are set in advance. An extension portion 81 and a convex portion 82 are provided as regulation portions.

That is, in the present embodiment, one group Z1 of the winding end portion 17a and the other group Z2 are arranged 180 degrees apart, 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 at a position relative to the first frame 11 by 180 degrees, but in order to make this impossible, an extension portion 81 and a convex portion 82 are provided. ..

Specifically, the extending portion 81 of the stator core 16 is provided only on the end core sheet 66, and is provided from two core outer peripheral protrusions 16c (with 90 degree intervals) adjacent to each other in the circumferential direction of the end core sheet 66. It is formed so as to extend further outward in the radial direction.

Further, the convex portion 82 of the first frame 11 is provided 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 that the assembly in the axial direction becomes impossible.
That is, when the stator 13 (stator core 16) is assembled so that the winding end portion 17a penetrates the insulating member R at a position relative to the first frame 11 by 180 degrees, it extends with the convex portion 82. The structure is such that the portion 81 collides with the portion 81 in the axial direction to prevent the assembly in the axial direction.

Then, as shown in FIGS. 5 and 6, the winding end portion 17a penetrates the insulating member R at a normal relative position set in advance with respect to the first frame 11 by the stator 13 (stator core 16). When assembled in this way, the extension portion 81 and the convex portion 82 do not collide with each other, and the assembly in the axial direction is permitted.

Next, a manufacturing method of the motor 10 configured as described above and its operation 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 of the first frame 11 is penetrated (the fitting hole 11a is formed). .. Further, in the method of manufacturing the motor 10, the first frame 11 and the stator 13 (stator core 16) are relatively moved in the axial direction, and the insulating member R (thin wall) is formed at the tip portion 17b of the winding end portion 17a. A step of providing a winding end portion 17a so as to penetrate the first frame 11 while forming a through hole Ra in the insulating member R by penetrating the portion Rc) is included. As a result, the tip portion 17b of the winding end portion portion 17a is led out to the outside 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 moved relative to each other 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. It also includes a step of inserting the jig 74 into the circumferential positioning recesses 71 to 73 formed on the outer periphery of the second frame 12 so as to straddle the axial direction. Then, in that state, the first frame 11 and the second frame 12 in a state where the stator core 16 is sandwiched in the axial direction by the through bolt 14 are fastened. As a result, 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 33a of the second frame 12. It is prevented from doing so.

Next, the effects of the above embodiment will be described below.
(1) The stator core 16 and the first frame 11 have an extension portion 81 as an erroneous assembly restricting portion that enables axial assembly only at a position where a relative position in the circumferential direction of each other is preset. Since the convex portion 82 is provided, the assembly in the axial direction other than the position where the relative position in the circumferential direction is set in advance, that is, the erroneous assembly is suppressed.

(2) The armature winding 17 is composed of a large number of segment conductors, and the winding end portion 17a is provided so as to extend to one end side in the axial direction and penetrate the first frame 11. Groups Z1 and Z2 of the portion 17a are arranged 180 degrees apart. Therefore, the stator 13 is likely to be erroneously assembled at a position relative to the first frame 11 by 180 degrees, but this can be avoided.

(3) Since the extension portion 81, which is an erroneous assembly restricting portion of the stator core 16, is provided only on the end core sheet 66 laminated on the axial end portion, the other stator core sheets 18 have the same pattern in the circumferential direction. It can be a simple shape that repeats. Further, since the end core sheet 66 has a rotor facing portion 65 extending in the radial direction and outward in the axial direction, the radial inner end surface of the teeth 16b (the end surface of the teeth 16b) while keeping the stack thickness of the stator core 16 small. The axial length of the surface facing the rotor 15) can be secured. Then, since the extension portion 81 and the rotor facing portion 65 are integrally provided on one type of end core sheet 66 different from the other stator core sheet 18, the increase in the number of parts (product number) is suppressed. Those effects can be obtained.

(4) The erroneous assembly restricting portion of the stator core 16 is an extension portion 81 extending radially outward from a part in the circumferential direction, and the erroneous assembly restricting portion of the first frame 11 is a preset position. Other than the above, since the convex portion 82 is projected in the axial direction so as to collide with the extending portion 81 in the axial direction, it is possible to specifically suppress erroneous assembly by colliding with them.

The above embodiment may be modified as follows.
In the above embodiment, the armature winding 17 is composed of a large number of segment conductors, and the winding end portion 17a is provided so as to extend to one end side in the axial direction and penetrate the first frame 11. The groups Z1 and Z2 of the winding end portion 17a are arranged 180 degrees apart, but the present invention is not limited to this, and an armature winding (winding end portion) having another configuration may be used. For example, it may be an armature winding composed of a conducting wire wound around a tooth.

-In the above embodiment, the extension portion 81, which is an erroneous assembly restricting portion of the stator core 16, is provided only on the end core sheet 66 laminated on the axial end portion, but the present invention is not limited to this, and the shaft is not limited to this. It may be provided on a stator core sheet other than the direction end portion, or may be provided on a stator core having a non-laminated structure.

In the above embodiment, it is assumed that the end core sheet 66 has a rotor facing portion 65 extending axially outward in the radial direction, but the end core sheet 66 does not have the rotor facing portion 65. An extending portion 81 may be provided as a sheet.

In the above embodiment, the erroneous assembly restricting portion of the stator core 16 is an extension portion 81 extending outward in the radial direction, and the erroneous assembly restricting portion of the first frame 11 is a convex portion 82 projecting in the axial direction. However, other shapes may be used as long as erroneous assembly can be suppressed. For example, the misassembly restricting portion of the stator core 16 is a convex portion that is projected in the axial direction, and the misassembly restricting portion of the first frame 11 is a flat surface that collides with the convex portion in the axial direction at a position other than a preset position. May be. In this case, it is necessary to form a concave portion in the first frame 11 into which the convex portion fits at a position where the relative position in the circumferential direction is set in advance.

-In the above embodiment, the stator core 16 and the first frame 11 are provided with an extension portion 81 and a convex portion 82 as erroneous assembly restricting portions, but the second frame 12 may be similarly provided. ..

The technical ideas that can be grasped from the above embodiments are described below.
(A) The motor according to claim 3, wherein the end core sheet has an axially extending portion extending in the radial direction and outward in the axial direction.

According to the same configuration, since the end core sheet has an axially extending portion extending outward in the axial direction on the inner side in the radial direction, the stacking thickness of the stator core can be kept small in the radial direction of the teeth. The axial length of the inner end surface (the surface facing the rotor) can be secured. Then, since the misassembly regulation part and the axial extension part are collectively provided on one type of end core sheet different from other stator core sheets, the increase in the number of parts (product number) is suppressed. Those effects can be obtained.

10 ... motor, 11 ... first frame, 12 ... second frame, 13 ... stator, 14 ... through bolt (fastening member), 16 ... stator core, 16b ... teeth, 16d ... arc recess (accommodation recess), 16e ... fastening member Containment recess, 17 ... armature winding, 17a ... winding end part, 18 ... stator core sheet, 66 ... end core sheet, 81 ... extension part (wrong assembly regulation part), 82 ... convex part (wrong assembly) Attachment Regulation Department).

Claims (3)

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 a plurality of accommodating recesses in the circumferential direction opened outward in the radial direction.
A first frame provided so as to cover one end surface side in the axial direction of the stator, and
A second frame provided so as to cover the other end surface side in the axial direction of the stator, and
A fastening member that fastens the first frame and the second frame with the stator core sandwiched in the axial direction and is partially accommodated in at least one fastening member accommodating recess among the plurality of accommodating recesses. It is a equipped motor
The stator core and at least one of the first frame and the second frame are provided with an erroneous assembly restricting unit that enables axial assembly only at positions where relative positions in the circumferential direction of each other are preset. Has been
The misassembly restricting portion of the stator core is an extending portion extending radially outward from a part in the circumferential direction.
The misassembly restricting portion of at least one of the first frame and the second frame is a convex portion that is projected in the axial direction so as to collide with the extending portion in the axial direction at a position other than the preset position. motor, characterized in that. The motor according to claim 1.
The armature winding is composed of a large number of segment conductors, and the winding end portion thereof is provided so as to extend to one end side in the axial direction and penetrate the first frame, and is a group of winding end portions. A motor characterized in that the coils are arranged 180 degrees apart. The motor according to claim 1 or 2.
The stator core is in a state where the stator core sheets are laminated.
The motor is characterized in that the misassembly restricting portion of the stator core is provided only on the end core sheet laminated on the axial end portion.

Images