Stator assembly device and stator assembly method

Abstract

The present invention is to solve the problem of providing a stator assembly device that is capable of inserting a coil into a slot without biting into an installed insulating member in the slot when the coil is inserted into the slot from the inside of a stator core. To solve the above problem, the stator assembly device is provided with a leading guide member that is disposed so as to be movable in the direction of the central axis of the stator core, that by moving toward the stator core, inserts into the inside of the insulating member before the coil is inserted, in a state in which at least a portion is fitted inside the open end of the insulating member, and that is disposed in front of the moving direction of the coil that moves toward the slot. The leading guide member has a quadrilateral shape in the length direction, has a shape that is inclined with one end portion side in the radial direction of the stator core as a vertex, and is tapered toward the front end along the center line in the radial direction of the stator core, and the vertex is disposed on the radial direction outside of the stator core.

Description

TECHNICAL FIELD

[0001] The present application relates to a stator assembling device and a stator assembling method. BACKGROUND

[0002] In the past, as a technique for preventing biting into an insulating member while inserting a coil into a slot of a stator core to which the insulating member is attached from the inside of the stator core, the technique described in Patent Literature 1 is known.

[0003] The technique described in Patent Literature 1 is as follows: two guide jigs are inserted into a slot of a stator core to which an insulating member is attached from the outside in the direction of the center axis of the stator core before the insertion of a coil, and the insulating member is opened, and in this state, the coil is moved into the slot while abutting against one of the guide jigs, and after the guide members abut against each other, the two guide jigs are retracted from the slot.

[0004] [Prior Art Documents]

[0005] (Patent Literature)

[0006] Patent Literature 1: Japanese Patent No. 6733823 SUMMARY

[0007] [Problems to be Solved by the Invention]

[0008] However, in the technique described in Patent Literature 1, since the shape of the front end side of the guide jig is only a pair of sides of a substantially quadrangular cross section that is tapered toward the front end along the radial direction of the stator core, in the case where the opening end of the insulating member in the slot becomes a state in which it is narrowed close to a closed state, it can be difficult to insert the guide jig into the slot.

[0009] An object of the present application is to provide a stator assembling device and a stator assembling method in which, even in the case where the opening end of the insulating member in the slot becomes a state in which it is narrowed close to a closed state, the insulating member is restored to an open state before the insertion of the coil, so that the workability of the stator is good.

[0010] [Technical Means for Solving the Problems]

[0011] (1) A stator assembly device (e.g., stator assembly device 1 described later) that assembles a stator (e.g., stator 200 described later) by inserting a coil (e.g., strip coil 100 described later) into a slot (e.g., slot 22 described later) of a stator core (e.g., stator core 2 described later) to which an insulating member (e.g., insulating paper 24 described later) is attached from an inner side of the stator core, in which a preliminary guide member (e.g., preliminary guide member 61 described later) is provided that is movable in a direction of a center axis of the stator core, and that is configured to be inserted into an inner side of the insulating member before the coil is inserted in a state in which at least a portion thereof is positioned within an opening end (e.g., opening end 24a described later) of the insulating member, and to be positioned in front of the coil in a direction of movement of the coil toward the slot, the preliminary guide member has a quadrilateral shape in a lengthwise direction, and a tip end portion (e.g., tip end portion 61a described later) of the preliminary guide member has a shape that is inclined in a radial direction of the stator core with a tip point (e.g., tip point P described later) on one end portion (e.g., one end portion 61b described later) of the preliminary guide member in the radial direction of the stator core as a vertex, and that is tapered toward a center line (e.g., center line O described later) of the preliminary guide member in the radial direction of the stator core, and the tip point is positioned on an outer side of the radial direction of the stator core.

[0012] (2) In the stator assembly device described in (1) above, it is preferable that a lateral width (e.g., lateral width W12, W22 described later) of the preliminary guide member in a circumferential direction of the stator core be greater than a width (e.g., width W0 described later) of the coil in the circumferential direction of the stator core.

[0013] (3) The stator assembly method of the present application assembles a stator (e.g., the stator 200 described later) by inserting a coil (e.g., the strip coil 100 described later) into a slot (e.g., the slot 22 described later) of a stator core (e.g., the stator core 2 described later) to which an insulating member (e.g., the insulating paper 24 described later) is attached, from the inner side of the stator core, and in the stator assembly method, there is provided a process of inserting a leading guide member (e.g., the leading guide member 61 described later) into the inner side of the insulating member in a state where at least a portion of the leading guide member is fitted in an opening end (e.g., the opening end 24a described later) of the insulating member, from the outer side of the center axis direction of the stator core, in a manner to be disposed in front of the moving direction of the coil moving into the slot, before the coil is inserted into the slot, the leading guide member has a quadrangular shape when viewed in the length direction, the leading end portion (e.g., the leading end portion 61a described later) of the leading guide member has a shape that is inclined along the radial direction of the stator core with one end portion (e.g., the one end portion 61b described later) of the radial direction of the stator core as a vertex (e.g., the vertex P described later), and the leading end portion is tapered toward the center line (e.g., the center line O described later) of the leading guide member along the radial direction of the stator core, and the vertex is disposed on the outer side of the radial direction of the stator core.

[0014] In the stator assembly method described in (3) above, it is preferable that the lateral width (e.g., the lateral width W12, W22 described later) of the leading guide member along the circumferential direction of the stator core be greater than the width (e.g., the width W0 described later) of the coil along the circumferential direction of the stator core.

[0015] (Effects of the Invention)

[0016] According to (1) above, even in a case where the opening end of the insulating member becomes a state close to a closed state, the leading guide member can be smoothly inserted into the inner side of the insulating member along the center axis direction of the stator core. Since the leading guide member has a structure that has a quadrangular shape when viewed in the length direction, has a shape that is inclined along the radial direction of the stator core with one end portion of the radial direction of the stator core as a vertex, and the leading end portion is tapered toward the center line of the leading guide member along the radial direction of the stator core, and the vertex is disposed on the outer side of the radial direction of the stator core, and is inserted into the slot in a state where at least a portion of the leading guide member is fitted in the opening end of the insulating member, the opening end of the insulating member can be restored to an open state before the coil is inserted, by simply inserting the leading guide member into the inner side of the insulating member. Therefore, a stator assembly device with good assembly workability of a stator can be provided.

[0017] According to (2) above, since the opening width of the opening end of the insulating member can be made greater than the width of the coil, the insertability of the coil is further improved.

[0018] According to the above (3), even in a case where the opening end of the insulating member becomes a state close to a closed state, the advance guide member can be smoothly inserted into the inside of the insulating member in the direction of the central axis of the stator core. Since the advance guide member has a structure that, viewed in the length direction, has a quadrangular shape, has a shape that is inclined along the radial direction of the stator core with one end portion side of the radial direction of the stator core as a vertex, and has a tip end that is tapered toward the center line of the advance guide member along the radial direction of the stator core, the vertex is disposed on the radial direction outside of the stator core, and the advance guide member is inserted into the slot in a state where at least a part of the advance guide member is fitted in the opening end of the insulating member, the opening end of the insulating member can be restored to an open state before the insertion of the coil only by inserting the advance guide member into the inside of the insulating member. Therefore, a stator assembly method in which the assembly workability of the stator is good can be provided.

[0019] According to the above (4), since the opening width of the opening end of the insulating member can be made larger than the width of the coil, the insertion property of the coil is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a side view illustrating the appearance of a stator assembly device.

[0021] Figure 2 is a perspective view that disassembles a positioning jig and a coil winding jig in the stator assembly device.

[0022] Figure 3 is a perspective view illustrating an insulating member that is mounted to a slot of a stator core.

[0023] Figure 4 is an expanded view illustrating an example of a coil.

[0024] Figure 5 is a perspective view illustrating a state where a coil expansion device is mounted on a coil winding jig that is mounted to the inside of a stator core.

[0025] Figure 6 is a view that observes a guide mechanism of a stator assembly device from the central axis direction.

[0026] Figure 7 is a cross-sectional view illustrating an advance guide member in the guide mechanism.

[0027] Figure 8 is a cross-sectional view illustrating a reinforcing guide member in the guide mechanism.

[0028] Figure 9A is a view that observes a tip end portion of an advance guide member along the radial direction of a stator core.

[0029] Figure 9B is a view of a leading end portion of the leading guide member as viewed in the circumferential direction of the stator core.

[0030] Figure 9C is a view of a leading end portion of the leading guide member as viewed in the central axis direction of the stator core.

[0031] Figure 10 is a view illustrating a state in which the guide member is inserted into the slot of the stator core.

[0032] Figure 11A is a view illustrating a state in which the leading guide member is inserted into the slot to a position of A portion in Figure 9A and Figure 9B is a view illustrating a cross-sectional shape of the leading guide member in the slot when the leading guide member is inserted into the slot to a position of A portion in

[0033] Figure 11B is a view illustrating a cross-sectional shape of the leading guide member in the slot when the leading guide member is inserted into the slot to a position of B portion in Figure 9A and Figure 9B is a view illustrating a cross-sectional shape of the leading guide member in the slot when the leading guide member is inserted into the slot to a position of C portion in

[0034] Figure 11C is a view illustrating a cross-sectional shape of the leading guide member in the slot when the leading guide member is inserted into the slot to a position of C portion in Figure 9A and Figure 9B is a view illustrating a cross-sectional shape of the leading guide member in the slot when the leading guide member is inserted into the slot to a position of C portion in

[0035] Figure 12A is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0036] Figure 12B is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0037] Figure 12C is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0038] Figure 12D is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0039] Figure 12E is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0040] Figure 12F is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0041] Figure 12G is a view illustrating a process of inserting the coil into the slot from the inside of the stator core.

[0042] Figure 12His a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0043] Figure 12I is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0044] Figure 12J is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0045] Figure 13A is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0046] Figure 13B is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0047] Figure 13C is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0048] Figure 13D is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0049] Figure 13E is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0050] Figure 13F is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0051] Figure 13G is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0052] Figure 13H is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0053] Figure 13I is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0054] Figure 13J is a view that explains a movement process of inserting a coil into a slot from an inner side of a stator core.

[0055] Figure 14 is a perspective view that illustrates an appearance of a stator. DETAILED DESCRIPTION

[0056] Hereinafter, an embodiment of the present application will be explained in detail with reference to the drawings. As shown in Figure 1 , Figure 2 the stator assembly device 1 has: a stator core 2; a positioning jig 3 that positions and fixes the stator core 2; a coil winding jig 4 that winds a strip-shaped coil 100 into a circular ring shape; a coil expanding mechanism section 5 that expands the strip-shaped coil 100 wound to the coil winding jig 4; and a guide mechanism section 6 that guides the strip-shaped coil 100 to be inserted into a slot 22 of the stator core 2.

[0057] AsFigure 2 and Figure 3 As shown in FIG. 1, the stator core 2 has, for example, a circular ring portion 21 composed of a laminate in which a plurality of thin-walled core sheets are laminated. The circular ring portion 21 has a through-hole 20 that penetrates in the axial direction in the center thereof. The stator core 2 has a plurality of slots 22 that penetrate in the axial direction of the stator core 2. The slots 22 have opening portions 22a that are arranged in a radial pattern at a certain interval along the circumferential direction of the circular ring portion 21 and open to the through-hole 20 on the radially inner side of the circular ring portion 21. The stator core 2 of the present embodiment has 72 slots 22. The circular ring portion 21 of the stator core 2 has six lug portions 23 that protrude at a certain interval on the outer periphery thereof.

[0058] Further, as shown in FIG. 2, in the stator core 2 and the positioning jig 3, the X direction in which the slots 22 are arranged is the circumferential direction. The Y direction in the radial direction from the center of the through-hole 20 is the radial direction. The Z direction that is orthogonal to the X direction and the Y direction is the central axis direction along the central axis of the through-hole 20 of the stator core 2. Figure 2 As shown in FIG. 3, the positioning jig 3 is formed in a hexagonal prism shape having a central axis direction dimension that is substantially equal to the central axis direction dimension of the stator core 2 and has a stator core insertion hole 31 in the center into which the stator core 2 can be inserted. The positioning jig 3 supports the six lug portions 23 of the stator core 2, respectively, and thereby fixes the stator core 2 to a prescribed position and posture within the stator core insertion hole 31. In the stator assembly device 1 of the present embodiment, the positioning jig 3 is fixed to the central portion of the base 11 of the stator assembly device 1 in such a manner that the central axis direction of the stator core 2 fixed within the stator core insertion hole 31 becomes the horizontal direction.

[0059] Figure 1 As shown in FIG. 4, the stator core 2 has the six lug portions 23 that protrude at a certain interval on the outer periphery of the circular ring portion 21. The positioning jig 3 has six positioning holes 32 that are formed in the stator core insertion hole 31 so as to correspond to the six lug portions 23 of the stator core 2. The six lug portions 23 of the stator core 2 are inserted into the six positioning holes 32 of the positioning jig 3, respectively, and thereby the stator core 2 is fixed to a prescribed position and posture within the stator core insertion hole 31. Figure 2 As shown in FIG. 5, the stator core 2 has the six lug portions 23 that protrude at a certain interval on the outer periphery of the circular ring portion 21. The positioning jig 3 has six positioning holes 32 that are formed in the stator core insertion hole 31 so as to correspond to the six lug portions 23 of the stator core 2. The six lug portions 23 of the stator core 2 are inserted into the six positioning holes 32 of the positioning jig 3, respectively, and thereby the stator core 2 is fixed to a prescribed position and posture within the stator core insertion hole 31.

[0060] Figure 3 As shown in FIG. 6, the stator core 2 has the six lug portions 23 that protrude at a certain interval on the outer periphery of the circular ring portion 21. The positioning jig 3 has six positioning holes 32 that are formed in the stator core insertion hole 31 so as to correspond to the six lug portions 23 of the stator core 2. The six lug portions 23 of the stator core 2 are inserted into the six positioning holes 32 of the positioning jig 3, respectively, and thereby the stator core 2 is fixed to a prescribed position and posture within the stator core insertion hole 31.

[0061] As shown in FIG. 7, the stator core 2 has the six lug portions 23 that protrude at a certain interval on the outer periphery of the circular ring portion 21. The positioning jig 3 has six positioning holes 32 that are formed in the stator core insertion hole 31 so as to correspond to the six lug portions 23 of the stator core 2. The six lug portions 23 of the stator core 2 are inserted into the six positioning holes 32 of the positioning jig 3, respectively, and thereby the stator core 2 is fixed to a prescribed position and posture within the stator core insertion hole 31. Figure 2 ​​As shown, a plurality of flange guides 32 in the shape of long thin plates are arranged in a radial pattern at regular intervals in the circumferential direction on both end faces 3a, 3a in the central axis direction of the positioning jig 3. When the band coil 100 described later is inserted into the slots 22 of the stator core 2, the flange guides 32 support the insulating paper 24 that protrudes from both end faces in the central axis direction of the stator core 2 and guide the movement of the band coil 100 into the slots 22. The flange guides 32 are provided so as to be able to move in and out in the radial direction of the stator core 2 by driving of actuators such as air cylinders, not shown.

[0062] The coil winding jig 4 has a substantially cylindrical jig body 41 and a plurality of comb tooth portions 42 that protrude in a radial pattern from the outer periphery of the jig body 41. The comb tooth portions 42 are provided at both end portions in the central axis direction of the jig body 41, respectively. The number of comb tooth portions 42, 42 between adjacent comb tooth portions 42, 42 in the circumferential direction of the jig body 41 is the same as the number of slots 22 provided in the stator core 2. The coil winding jig 4 is formed so that the outer diameter of the coil winding jig 4, which is defined by the position of the front end of the comb tooth portion 42, is smaller than the hole diameter of the through hole 20 of the stator core 2, so as to be able to be inserted into the through hole 20 of the stator core 2.

[0063] On the plurality of comb tooth portions 42 of the coil winding jig 4, the band coil 100 for mounting on the stator core 2 is wound in a circular ring shape. As shown, Figure 4 The band coil 100 is a long strip-shaped continuous wave coil formed of flat wire 101 having a substantially rectangular cross-sectional shape. Since the wave coil does not require the technology of dividing the coil, which is the mainstream on the market, into a plurality of sections and welding the coil end portions after insertion into the slots, the wave coil does not require the use of high-purity copper material in the coil in order to be able to cope with heat processing at the welding site, for example. Therefore, it is also possible to use recycled copper material containing impurities, and it is possible to contribute to the realization of recycling of resources. Furthermore, since the wave coil does not require welding, it is possible to achieve weight reduction of the coil, and it is possible to achieve weight reduction of the rotary electric machine using the coil. In the case where the rotary electric machine is mounted on a hybrid vehicle, by making the vehicle lightweight, it is possible to reduce carbon dioxide and to reduce the adverse effects on the global environment.

[0064] The strip coil 100 has a plurality of straight portions 102 and a plurality of coil end portions 103. The straight portions 102 are portions inserted into the slots 22 of the stator core 2, extend substantially linearly respectively and are arranged in parallel at a certain interval. The coil end portions 103 are arranged at positions closer to the side ends of the strip coil 100 than the straight portions 102, alternately connect one end portions of the adjacent straight portions 102 to each other and the other end portions to each other in the length direction of the strip coil 100 in a substantially triangular mountain shape. When the strip coil 100 is mounted in the slots 22 of the stator core 2, the coil end portions 103 respectively protrude from the slots 22 toward the axial direction of the stator core 2, and when the strip coil 100 is inserted into the slots 22, the coil end portions 103 are portions pressed by the coil expansion mechanism portions 5 described later. The strip coil 100 of the present embodiment is formed in a long strip shape by bundling six flat wires 101 each of which is bent to have the plurality of straight portions 102 and the plurality of coil end portions 103 in a manner that the straight portions 102 are arranged in parallel at a certain interval.

[0065] The coil winding jig 4 sequentially inserts the straight portions 102 of the strip coil 100 from the outside between the comb tooth portions 42, 42 before being inserted into the through hole 20 of the stator core 2, thereby winding the strip coil 100 in multiple layers. Thus, as shown in FIG. 1, the coil winding jig 4 is configured to wind the strip coil 100 in a circular ring shape. Figure 2

[0066] The coil winding jig 4 inserted into the through hole 20 of the stator core 2 is supported by the positioning jig 3 interposed therebetween, thereby being held at a prescribed position and posture, with a pair of the coil expansion mechanism portions 5 arranged on both sides facing the central axis direction of the stator core 2. As shown in FIG. 2, the coil expansion mechanism portion 5 of the present embodiment has a substantially cylindrical appearance shape, as shown in FIG. 3, is arranged opposite to the central axis direction of the coil winding jig 4 inserted into the inside of the stator core 2. The coil expansion mechanism portion 5 is arranged to be linearly moved on the base 11 by driving of an unillustrated actuator, and is capable of being moved in a direction abutting against and a direction apart from the coil winding jig 4 respectively. Figure 5 Figure 1

[0067] ​​​The coil expansion mechanism portion 5 is formed in a substantially cylindrical shape, and has a plurality of coil pressing portions 51 on the outer periphery of the front end side. The plurality of coil pressing portions 51 are arranged along the outer periphery of the front end side of the coil expansion mechanism portion 5, and are provided so as to be able to expand and contract in the radial direction by the driving of an unillustrated actuator. The outer diameter of the coil pressing portion 51 in the contracted state is smaller than the inner diameter of the annular band-shaped coil 100 wound around the coil winding jig 4. The outer diameter of the coil pressing portion 51 in the expanded state is larger than the outer diameter of the coil winding jig 4. The coil expansion mechanism portion 5 holds the coil winding jig 4 by inserting the coil pressing portion 51 in the contracted state inside the annular band-shaped coil 100 wound around the coil winding jig 4. When the coil pressing portion 51 inserted inside the band-shaped coil 100 expands, the band-shaped coil 100 is pressed outward to expand. Thus, the straight portion 102 of the band-shaped coil 100 moves inside the insulation paper 24 arranged in the slot 22 on the radially outer side, and is inserted into the slot 22. The coil pressing portion 51 of the coil expansion mechanism portion 5 constitutes a pressing unit that presses the band-shaped coil 100 toward the radially outer side, thereby causing the straight portion 102 of the band-shaped coil 100 to move inside the insulation paper 24 in the slot 22.

[0068] As shown in Figure 1 , a pair of guide mechanism portions 6 are arranged in a manner that sandwiches the positioning jig 3 in the middle and faces both sides in the central axis direction of the stator core 2, similarly to the coil expansion mechanism portion 5. The pair of guide mechanism portions 6 are concentrically arranged on the outer periphery side of the coil expansion mechanism portion 5, respectively.

[0069] Since the pair of guide mechanism portions 6 are of the same structure, the structure of one guide mechanism portion 6 will be described with reference to Figure 6 ~ Fig. 9. Figure 6 is a view of one guide mechanism portion 6 as viewed from the direction along the central axis direction of the stator core 2. The guide mechanism portion 6 has a plurality of leading guide members 61 arranged in an annular shape; and a plurality of reinforcing guide members 62 arranged in an annular shape on the outer side of the leading guide members 61.

[0070] The leading guide member 61 is composed of a bar-shaped body having a sufficient length that can be inserted in the central axis direction of the stator core 2 inside the insulation paper 24 mounted in the slot 22. The cross section orthogonal to the length direction of the leading guide member 61 is a quadrangular shape with the corners rounded except for the pointed front end portion. Thus, the leading guide member 61 is in a quadrangular shape as viewed from the length direction. The length direction of the leading guide member 61 is arranged along the central axis direction of the stator core 2.

[0071] The longitudinal width W11 (refer to Fig. 9) of the leading guide member 61 in the radial direction of the stator core 2 is larger than the depth of the slot 22 in the radial direction of the stator core 2. Figure 13AThe longitudinal width W11 of the guide member 61 in this embodiment is set to approximately 1 / 5 of the depth of the slot 22. The transverse width W12 of the guide member 61 along the circumference of the stator core 2 (refer to...) Figure 13A The width W12 of the guide member 61 is smaller than the width W0 of the straight portion 102 of the strip coil 100 inserted into the slot 22 along the circumferential direction of the stator core 2. (Refer to...) Figure 13A )big.

[0072] At least one guide member 61 is provided for each slot 22, and they are arranged in a ring with the same spacing as the slots 22. In this embodiment, one guide member 61 is provided for each slot 22, but multiple guide members 61 may also be provided for each slot 22.

[0073] like Figure 7 As shown, the front end of the guide member 61 is tapered. The shape of the front end of the guide member 61 will be described later. Operating portions 611 protruding radially outward in an annular shape are formed on the base end side of the guide member 61. Guide holes 612 extending radially outward are provided in the operating portions 611. The support plate portion 601 provided in the guide mechanism portion 6 is capable of radially ( Figure 7 It is engaged within the guide hole 612 by sliding in the vertical direction. Thus, the advance guide member 61 is supported on the guide mechanism part 6 in a radially movable manner.

[0074] On the front end side of the operating section 611, one end of the connecting plate 613 is rotatably mounted via a rotating shaft 613a. The other end of the connecting plate 613 extends in the opposite direction to the extending direction of the advance guide member 61 relative to the operating section 611. Figure 7 Extending to the right, the lead guide member support 602 is rotatably mounted on the guide mechanism 6 via a rotating shaft 613b. An elastic member 614 is provided on the other end of the connecting plate 613 opposite to the operating part 611 relative to the rotating shaft 613b. The elastic member 614 is composed of a coil spring or the like that exerts a force on the other end of the connecting plate 613 radially outward.

[0075] The elastic member 614 exerts a lateral radial outward force on the other end of the connecting plate 613, thereby pressing the guide member 61 against the connecting plate 613 and keeping it constantly pressed radially inward. However, when the pressing force exerted on the guide member 61 from radial inward to outward exceeds the force of the elastic member 614, the guide member 61 can move along... Figure 7The hollow arrow moves by expanding its diameter radially outward. When the pressure is released, the guide member 61, under the action of the elastic member 614, shrinks its diameter radially inward to return to a stable state.

[0076] Multiple advance guide components 61 are configured to utilize the settings in Figure 6 The actuator 610 for driving the first guide member of the guide mechanism section 6 shown is driven and can move in the direction of the central axis of the stator core 2. The actuator 610 is composed of... Figure 1 The stator assembly apparatus 1 shown is controlled by a control unit 10. When the actuator 610 is driven, the actuator 610 causes the advance guide member support 602 to move along the central axis of the stator core 2 in the direction toward and away from the stator core 2. By moving the advance guide member support 602 toward the stator core 2, a plurality of advance guide members 61 are inserted into the inner side of the insulating paper 24 in their respective slots 22 from the central axis of the stator core 2. By moving the advance guide member support 602 away from the stator core 2, the plurality of advance guide members 61 disengage from the inner side of the insulating paper 24 in the slots 22 toward the outer side of the central axis of the stator core 2.

[0077] The reinforcing guide member 62 is composed of a rod-shaped body having a sufficient length to be inserted along the central axis of the stator core 2 relative to the inner side of the insulating paper 24 installed in the slot 22, and is shorter than the length of the preceding guide member 61. The cross-section orthogonal to the longitudinal direction of the reinforcing guide member 62 is a quadrilateral shape with rounded corners except for a pointed front end. The longitudinal width W21 of the reinforcing guide member 62 along the radial direction of the stator core 2 (refer to...) Figure 13A The longitudinal width W11 of the leading guide member 61 is approximately the same. The transverse width W22 of the reinforcing guide member 62 along the circumference of the stator core 2 is (refer to...). Figure 13A It is approximately the same as the lateral width W12 of the lead guide member 61.

[0078] The reinforcing guide member 62 is provided with three of each slot 22. That is, as shown in the example... Figure 8As shown, the reinforcing guide member 62 is composed of a first reinforcing guide member 62a on the innermost diameter side, a second reinforcing guide member 62b disposed radially outside the first reinforcing guide member 62a, and a third reinforcing guide member 62c disposed radially outside the second reinforcing guide member 62b. The first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c are arranged in a ring with the same spacing as the spacing of the groove 22, and are stacked radially. However, the first reinforcing guide member 62a on the innermost diameter side of the reinforcing guide member 62 is separated from the preceding guide member 61 by a distance L equivalent to the longitudinal width W11 of one preceding guide member 61 and the longitudinal width W21 of one first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c (see reference). Figure 10 , Figure 13A The specific distance L is set appropriately according to the specifications of the groove 22 and the type of insulating paper 24, and is not particularly limited. In this embodiment, it is set to 4.2mm.

[0079] like Figure 8 As shown, the front ends of the first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c are each formed into a pointed shape. Operating portions 621a, 621b, and 621c, respectively, protruding radially outward in an annular shape, are formed on the base end sides of the first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c. The operating portions 621a, 621b, and 621c are each independently connected to the actuator 620 of the guide mechanism section 6.

[0080] The first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c are configured to move along the central axis of the stator core 2, respectively, by means of an actuator 620 for driving the reinforcing guide members provided in the guide mechanism section 6. Figure 6 As shown, the actuator 620 is composed of a first enhanced guidance actuator 620a, a second enhanced guidance actuator 620b, and a third enhanced guidance actuator 620c. Figure 1 The control unit 10 of the stator assembly device 1 shown is controlled independently.

[0081] When the actuator 620 is driven, it causes the first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c to move individually along the central axis of the stator core 2, respectively, in the direction toward and away from the stator core 2. By moving the first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c toward the stator core 2, they are inserted into the inner side of the insulating paper 24 in the corresponding slot 22 from the central axis of the stator core 2. By moving the first reinforcing guide member 62a, the second reinforcing guide member 62b, and the third reinforcing guide member 62c away from the stator core 2, they are individually disengaged from the inner side of the insulating paper 24 in the slot 22 toward the outer side of the central axis of the stator core 2.

[0082] Here, refer to Figures 9A-9C The shape of the front end of the guide member 61 will be described. The front end portion 61a of the guide member 61 has a vertex P on one end portion 61b side of the guide member 61 along the radial direction of the stator core 2. From this vertex P, the front end portion 61a of the guide member 61 slopes radially towards the other end portion 61c side of the guide member 61 along the radial direction of the stator core 2. The front end portion 61a of the guide member 61 in this embodiment is as follows... Figure 9B It can be tilted in a straight line, but it can also be tilted in a way that depicts a curve.

[0083] Furthermore, such as Figure 9A and Figure 9C As shown, the front end portion 61a of the guide member 61 has a shape that tapers towards the front end of the centerline O of the guide member 61 along the radial direction of the stator core 2. The two side surfaces 61d of the guide member 61 facing the stator core 2 in the circumferential direction gradually taper towards the front end and meet each other approximately on the centerline O. Thus, a ridge Pa is formed at the front end portion 61a of the guide member 61, inclined from the vertex P on one end 61b side to the other end 61c side. This ridge Pa is approximately aligned with the centerline O of the guide member 61. In the guide member 61 of this embodiment, as... Figure 9A As shown, the inclined surfaces 61d1 and 61dl, formed by the tapering of the two side surfaces 61d and the front end of 61d, are formed by a straight inclined plane, but can also be formed by a curved surface.

[0084] like Figure 9B and Figure 9CAs shown, the lead guide member 61, which has such a front end shape, is mounted on the guide mechanism section 6 with its vertex P positioned on the radially outer side (Y1 side) of the stator core 2.

[0085] Next, the process of inserting the straight portion 102 of the strip coil 100 into the inside of the insulating paper 24 in the slot 22 of the stator core 2 in the stator assembly device 1 will be described. Figure 10 , Figures 11A-11C and Figures 12A-12J The diagram schematically illustrates the process of inserting a strip coil 100 wound in the coil winding jig 4 into the inside of the insulating paper 24 within the slot 22 of the stator core 2 from the inside of the stator core 2. Since the actions on both sides of the stator core 2 along its central axis are performed simultaneously, therefore... Figures 12A-12J This only describes the operation process on one side of the central axis direction of the stator core 2. Figures 13A-13J The advance guide member 61 and the reinforcing guide member 62 are schematically shown in a slot 22 of the stator core 2. Figures 13A-13J In terms of time and Figures 12A-12J Corresponding. Additionally, in Figure 10 , Figures 12A-12J and Figures 13A-13J The illustration of positioning fixture 3 is omitted in the text.

[0086] First, such as Figure 10 As shown, after the coil winding jig 4, on which the strip coil 100 is wound, is supported by the coil expansion mechanism 5 in the through hole 20 of the stator core 2, the actuators 610 and 620 of the guide mechanism 6 are driven and controlled by the control unit 10 to insert all the advance guide members 61 and the reinforcing guide members 62 into the inner side of the insulating paper 24 in the slot 22 from both outer sides in the direction of the central axis of the stator core 2. The front ends of the advance guide members 61 and the reinforcing guide members 62 inserted into the inner side of the insulating paper 24 in the slot 22 are arranged opposite each other in the slot 22.

[0087] The advance guide member 61 is disposed on the innermost diameter side of the guide mechanism 6, and is disposed near the opening 22a of the slot 22 when it moves toward the stator core 2 and is inserted into the slot 22. Therefore, by moving toward the stator core 2, the advance guide member 61 is inserted into the inner side of the insulating paper 24 with at least a portion of it overlapping the opening end 24a of the insulating paper 24. Figure 11C ).

[0088] At this time, the advance guide member 61 enters the inner side of the insulating paper 24 from the vertex P side. Since the vertex P is located radially outward (Y1 side) of the stator core 2, the advance guide member 61 enters the inner side of the insulating paper 24 from a position closer to the inner side (Y1 side) of the groove 22 than the opening end 24a of the insulating paper 24. Figure 11A ).

[0089] After that, when the insertion of the leading guide member 61 is performed, the two inclined surfaces 61d1, 61d1 gradually enter from the inner side to the opening end 24a, 24a of the insulation paper 24 along the inclination of the front end portion 61a of the leading guide member 61. Thereby, even if the opening end 24a, 24a of the insulation paper 24 becomes a state of being narrowed to a state close to the closed state, it is possible to guide the opening end 24a, 24a to open from the inner side of the insulation paper 24. At the same time, the both side surfaces 61d, 61d of the leading guide member 61 also guide in a manner of gradually opening from the inner side to the outer side in the vicinity of the opening end 24a, 24a of the insulation paper 24. Figure 11B

[0090] When the insertion of the leading guide member 61 is completed, the leading guide member 61 is disposed in the slot 22 in a state where at least a part thereof is placed inside the opening end 24a, 24a of the insulation paper 24. The side surface of the other end portion 61c side of the leading guide member 61 is disposed on the outer side of the slot 22, that is, the radially inner side (Y2 side) of the stator core 2, in conformity with or more inside than the opening end 24a, 24a of the insulation paper 24. Figure 11C Thereby, the opening end 24a, 24a of the insulation paper 24 is expanded to be larger than the width W0 of the strip coil 100, and the straight portion 102 of the strip coil 100 is guided to smoothly enter the inner side of the insulation paper 24 by abutting against the leading guide member 61.

[0091] In addition, the front end of the reinforcement guide member 62 (the first reinforcement guide member 62a, the second reinforcement guide member 62b, the third reinforcement guide member 62c) can also be formed in the same shape as the front end of the leading guide member 61.

[0092] In a state where the leading guide member 61 and the reinforcement guide member 62 are all inserted into the inner side of the insulation paper 24 in the slot 22, as described above, the leading guide member 61 is disposed in the slot 22 in a state where at least a part thereof is placed inside the opening end 24a, 24a of the insulation paper 24. On the other hand, the first reinforcement guide member 62a, the second reinforcement guide member 62b, and the third reinforcement guide member 62c of the reinforcement guide member 62 are disposed in a state of being stacked on the radially outer side (the inner side of the slot 22) in the slot 22. The leading guide member 61 and the first reinforcement guide member 62a on the innermost diameter side are separated by a distance L.

[0093] ​In this way, the state in which the advance guide member 61 and the reinforcement guide member 62 are inserted into the inner side of the insulation paper 24 in the slot 22, and the state in which the straight portion 102 of the ribbon coil 100 is inserted into the inner side of the insulation paper 24 are achieved. Therefore, the insulation paper 24 before the insertion of the straight portion 102 of the ribbon coil 100 becomes the state of the insulation paper 24 after the insertion of the straight portion 102 of the ribbon coil 100, and the shape of the insulation paper 24 is maintained as an appropriate shape before the insertion of the ribbon coil 100. Also, since at least a part of the advance guide member 61 is arranged in the slot 22 in a state of being fitted in the opening end 24a, 24a of the insulation paper 24, the opening end 24a, 24a of the insulation paper 24 can be maintained in an open state before the insertion of the ribbon coil 100. Therefore, since the insulation paper 24 is prevented from coming into contact with the moving ribbon coil 100, the ribbon coil 100 can be smoothly introduced into the inner side of the insulation paper 24.

[0094] After the insertion of the advance guide member 61 and the reinforcement guide member 62 is completed, the control section 10 causes the coil expansion mechanism section 5 to operate, so that the coil pressing section 51 is expanded in the direction of the hollow arrow shown in FIG. 6. By this, the coil end portion 103 of the ribbon coil 100 wound on the coil winding jig 4 is pressed by the coil pressing section 51 which is expanded, and moves to the radial direction outside of the stator core 2. Along with this movement, the ribbon coil 100 is gradually expanded, and the straight portion 102 gradually moves to the inner side of the insulation paper 24 in the slot 22. Figure 12A Figure 12A Figure 13A

[0095] The expanded ribbon coil 100 is pressed by the coil pressing section 51, and the advance guide member 61 is pressed to the radial direction outside of the stator core 2. By the advance guide member 61 being pressed by the ribbon coil 100, the advance guide member 61 moves to the radial direction outside in a manner of shortening the distance L against the force of the elastic member 614. Therefore, the advance guide member 61 pressed by the ribbon coil 100 comes into contact with or approaches the first reinforcement guide member 62a which is disposed at the innermost side of the reinforcement guide member 62. Figure 12B 13B

[0096] ​​​​​When the preceding guide member 61 is pressed by the belt coil 100, a pressing force toward the radially inner side is generated on the preceding guide member 61 due to the force of the elastic member 614. Therefore, the preceding guide member 61 moves on the inner side of the insulation paper 24 while being pressed toward the coil pressing portion 51 and the radially inner side during movement by the belt coil 100. Thus, since the belt coil 100 is always sandwiched between the preceding guide member 61 and the coil pressing portion 51 during movement, dispersion of the belt coil 100 to the front side in the movement direction is suppressed. In the present embodiment, the link plate 613 and the elastic member 614 constitute a pressing unit for pressing the belt coil 100 toward the radially inner side of the stator core 2.

[0097] When the preceding guide member 61 moves in a manner to shorten the distance L and abuts on or approaches the first reinforcement guide member 62a on the innermost diameter side, the control portion 10 drives the first reinforcement guide actuator 620a to move the first reinforcement guide member 62a to the outer side in the central axis direction of the stator core 2. Thus, the first reinforcement guide member 62a retreats from the inner side of the insulation paper 24 in the slot 22. The preceding guide member 61 and the second reinforcement guide member 62b are separated by the distance L after retreat of the first reinforcement guide member 62a. Figure 12C Figure 13C ).

[0098] Further, in conjunction with the expansion of the belt coil 100, the preceding guide member 61 is pressed by the belt coil 100 to move to the radially outer side in a manner to reduce the distance L from the second reinforcement guide member 62b. Thus, the preceding guide member 61 pressed by the belt coil 100 abuts on or approaches the second reinforcement guide member 62b on the innermost diameter side remaining in the slot 22 and the third reinforcement guide member 62c. Figure 12D Figure 13D ).

[0099] When the preceding guide member 61 moves in a manner to shorten the distance L and abuts on or approaches the second reinforcement guide member 62b, the control portion 10 drives the second reinforcement guide actuator 620b to move the second reinforcement guide member 62b to the outer side in the central axis direction of the stator core 2. Thus, the second reinforcement guide member 62b retreats from the inner side of the insulation paper 24 in the slot 22. The preceding guide member 61 and the third reinforcement guide member 62c are separated by the distance L after retreat of the second reinforcement guide member 62b. Figure 12E Figure 13E ).

[0100] ​​​Further, along with the expansion of the belt coil 100, the leading guide member 61 is pressed by the belt coil 100 to move to the radial outside in a manner to reduce the distance L remaining in the slot 22. Thus, the leading guide member 61 pressed by the belt coil 100 abuts or approaches the radially innermost wall surface 22b in the slot 22 Figure 12F , Figure 13F ).

[0101] When the leading guide member 61 moves to abut or approach the third reinforcement guide member 62c in a manner to reduce the distance L, the control section 10 drives the third reinforcement guide actuator 620c to move the third reinforcement guide member 62c to the outside in the direction of the central axis of the stator core 2. Thus, the third reinforcement guide member 62c retreats from the inside of the insulation paper 24 in the slot 22. On the inside of the insulation paper 24 after the retreat of the third reinforcement guide member 62c, a gap corresponding to the distance L is formed radially outward of the leading guide member 61 Figure 12G , Figure 13G ).

[0102] Further, along with the expansion of the belt coil 100, the leading guide member 61 is pressed by the belt coil 100 to move to the radial outside in a manner to reduce the distance L remaining in the slot 22. Thus, the leading guide member 61 pressed by the belt coil 100 abuts or approaches the radially innermost wall surface 22b in the slot 22 Figure 12H , Figure 13H ).

[0103] When the leading guide member 61 moves to abut or approach the radially innermost wall surface 22b of the slot 22 in a manner to reduce the distance L, the control section 10 drives the actuator 610 to move the leading guide member 61 to the outside in the direction of the central axis of the stator core 2. Thus, the leading guide member 61 retreats from the inside of the insulation paper 24 in the slot 22. On the inside of the insulation paper 24 after the retreat of the leading guide member 61, a gap corresponding to the distance L is formed between the straight portion 102 of the belt coil 100 and the wall surface 22b Figure 12I , Figure 13I ).

[0104] When the belt coil 100 further expands, the belt coil 100 moves to the radial outside in a manner to reduce the distance L remaining in the slot 22. Thus, the straight portion 102 of the belt coil 100 is housed inside the insulation paper 24 in the slot 22 Figure 12J , Figure 13J ). Thus, the belt coil 100 is mounted to the slot 22 of the stator core 2, thereby completing the stator 200 Figure 14 ).

[0105] According to the stator assembly device 1 and the stator assembly method of the above embodiment, the following effects are exerted. That is, the stator assembly device 1 of the present embodiment is a stator assembly device that assembles a stator 200 by inserting a ribbon coil 100 into a slot 22 of a stator core 2 on which an insulating paper 24 is mounted, from an inner side of the stator core 2. The stator assembly device 1 is provided with a preliminary guide member 61 that is disposed so as to be movable in the direction of the central axis of the stator core 2, and that is configured to be inserted into the inner side of the insulating paper 24 before the insertion of the ribbon coil 100, in a state in which at least a portion thereof is positioned inside the opening end 24a of the insulating paper 24, by being moved toward the stator core 2, and to be disposed in front of the moving direction of the ribbon coil 100 that is moved toward the slot 22. The preliminary guide member 61 has a quadrangular shape when viewed in the length direction, and the front end portion 61a of the preliminary guide member 61 has a shape that is inclined in the radial direction of the stator core 2 with one end portion side (Y1 side) of the radial direction of the stator core 2 as a vertex P, and that is tapered toward the center line O of the preliminary guide member 61 in the radial direction of the stator core 2, with the vertex P being disposed on the outer side in the radial direction of the stator core 2. According to this, even in a case where the opening ends 24a, 24a of the insulating paper 24 become narrow to a state close to a closed state, the preliminary guide member 61 can be smoothly inserted into the inner side of the insulating paper 24 in the direction of the central axis of the stator core 2. Since the preliminary guide member 61 has a structure in which it has a quadrangular shape when viewed in the length direction, has a shape that is inclined in the radial direction of the stator core 2 with one end portion side (Y1 side) of the radial direction of the stator core 2 as a vertex P, and that is tapered toward the center line in the radial direction of the stator core 2, with the vertex P being disposed on the outer side in the radial direction of the stator core 2, and is inserted into the slot 22 in a state in which at least a portion thereof is positioned inside the opening end 24a, 24a of the insulating paper 24, the opening ends 24a, 24a of the insulating paper 24 can be returned to an open state before the insertion of the ribbon coil 100, simply by inserting the preliminary guide member 61 into the inner side of the insulating paper 24. Therefore, it is possible to provide a stator assembly device 1 that is excellent in assembly workability of a stator 200.

[0106] In the present embodiment, the lateral width W12 of the preliminary guide member 61 in the circumferential direction of the stator core 2 is larger than the width W0 of the straight portion 102 of the ribbon coil 100 in the circumferential direction of the stator core 2. According to this, since the opening ends 24a, 24a of the insulating paper 24 can be opened wider than the width W0 of the straight portion 102 of the ribbon coil 100, the insertability of the ribbon coil 100 is further improved.

[0107] The stator assembly method of the present embodiment is a stator assembly method of assembling the stator 200 by inserting the strip coil 100 into the slot 22 of the stator core 2 on which the insulating paper 24 is mounted, from the inner side of the stator core 2. The stator assembly method has one process of inserting the leading guide member 61 into the inner side of the insulating paper 24 in a state where at least a part of the leading guide member 61 is fitted in the opening end 24a, 24a of the insulating paper 24, from the outer side of the center axis direction of the stator core 2, before the strip coil 100 is inserted into the slot 22. The leading guide member 61 has a quadrangular shape when viewed in the length direction, and the leading end portion 61a of the leading guide member 61 has a shape that is inclined along the radial direction of the stator core 2 with one end portion side (Y1 side) of the radial direction of the stator core 2 as a vertex P, and the leading end becomes thin toward the center line O along the radial direction of the stator core 2, and the vertex P is disposed on the outer side in the radial direction of the stator core 2. According to this, even in a case where the opening end 24a, 24a of the insulating paper 24 becomes narrow to a state close to the closed state, it is possible to smoothly insert the leading guide member 61 into the inner side of the insulating paper 24 along the center axis direction of the stator core 2. Since the leading guide member 61 has a structure that has a quadrangular shape when viewed in the length direction, has a shape that is inclined along the radial direction of the stator core 2 with one end portion side (Y1 side) of the radial direction of the stator core 2 as a vertex P, and the leading end becomes thin toward the center line O along the radial direction of the stator core 2, and the vertex P is disposed on the outer side in the radial direction of the stator core 2, and is inserted into the slot 22 in a state where at least a part of the leading guide member 61 is fitted in the opening end 24a, 24a of the insulating paper 24, it is possible to restore the opening end 24a, 24a of the insulating paper 24 to the opened state before the strip coil 100 is inserted, only by inserting the leading guide member 61 into the inner side of the insulating paper 24. Therefore, it is possible to provide a stator assembly method of the stator 200 that is excellent in assembly workability.

[0108] In the present embodiment, the width W12 of the leading guide member 61 in the circumferential direction of the stator core 2 is larger than the width W0 of the straight portion 102 of the strip coil 100 in the circumferential direction of the stator core 2. According to this, since it is possible to open the opening end 24a, 24a of the insulating paper 24 wider than the width W0 of the straight portion 102 of the strip coil 100, the insertability of the strip coil 100 is further improved.

[0109] The stator assembly device 1 of the embodiment described above is configured so that the center axis directions of the stator core 2 and the coil winding jig 4 are disposed in the horizontal direction, but can be configured so that the center axis directions of the stator core 2 and the coil winding jig 4 are disposed in a direction other than the horizontal direction such as the vertical direction.

[0110] REFERENCE NUMERALS

[0111] 1 stator assembly device

[0112] 2 stator core

[0113] 22 slot

[0114] 24 insulating paper (insulating member)

[0115] 24a open end

[0116] 61 leading guide member

[0117] 61a front end portion

[0118] 100 strip coil

[0119] 200 stator

[0120] P apex

[0121] W0 width of strip coil

[0122] W12, W22 lateral width

Claims

1. A stator assembly device that assembles a stator by inserting a coil from the inside of a stator core in a slot of the stator core in which an insulating member is installed, characterized by comprising a preliminary guide member that is provided so as to be movable in the direction of the central axis of the stator core, that is inserted into the inside of the insulating member in a state in which at least a portion thereof is fitted in the open end of the insulating member before the insertion of the coil by moving toward the stator core, and that is disposed in front of the moving direction of the coil that moves toward the slot, the preliminary guide member has a quadrangular shape when viewed in the length direction, the tip end portion of the preliminary guide member has a shape in which the two side surfaces that face in the circumferential direction of the stator core gradually approach as they go toward the tip end, the tip end portion of the preliminary guide member has a tip end tapered shape, and the tip end tapered shape has a ridge line that is formed by the mutual abutment of the center lines of the preliminary guide member in the radial direction of the stator core, the ridge line has the radial direction outside of the stator core as a vertex and tilts toward the base end side as it goes toward the radial direction inside of the stator core. the lateral width of the preliminary guide member in the circumferential direction of the stator core is greater than the width of the coil in the circumferential direction of the stator core.

2. The stator assembly apparatus of claim 1, wherein, 3. A stator assembly method that assembles a stator by inserting a coil from the inside of a stator core in a slot of the stator core in which an insulating member is installed, characterized by comprising a step of inserting a preliminary guide member into the inside of the insulating member in a state in which at least a portion thereof is fitted in the open end of the insulating member from the outside of the central axis of the stator core before the insertion of the coil into the slot so as to be disposed in front of the moving direction of the coil that moves toward the slot, the preliminary guide member has a quadrangular shape when viewed in the length direction, the tip end portion of the preliminary guide member has a shape in which the two side surfaces that face in the circumferential direction of the stator core gradually approach as they go toward the tip end, the tip end portion of the preliminary guide member has a tip end tapered shape, and the tip end tapered shape has a ridge line that is formed by the mutual abutment of the center lines of the preliminary guide member in the radial direction of the stator core, the ridge line has the radial direction outside of the stator core as a vertex and tilts toward the base end side as it goes toward the radial direction inside of the stator core. the lateral width of the preliminary guide member in the circumferential direction of the stator core is greater than the width of the coil in the circumferential direction of the stator core. ​ 4. The method of assembling a stator of claim 3, wherein, ​

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