JP2021136802A - Stator and manufacturing method of stator - Google Patents

Abstract

To improve rigidity.SOLUTION: A stator comprises: an annular stator core 10 having a plurality of teeth 13 arranged in a peripheral direction on an inner peripheral face side, and forming a plurality of slots 14 between the adjacent teeth 13; a coil 21; a plurality of slot sheets 30 arranged between an inner wall face 14a of the slot 14 and the coil 21, and having a sheet end part 31 projected in an axial direction Z from the slot 14; a varnish impregnated and hardened in the slot 14; and a first annular member 40. The first annular member 40 includes: a first annular part 42 arranged on the inner peripheral face side of a coil end part 24; and a first projection 43 that is projected from the first annular part 42 to be arranged on the side of an end face 13a in the axial direction Z of the teeth 13, and has a shape of entering between the sheet end parts 31 of the slot sheets 30 adjacent in the peripheral direction.SELECTED DRAWING: Figure 2

Description

This technique relates to a stator and a method of manufacturing a stator constituting a rotary electric machine.

Conventionally, as a stator used for a rotary electric machine mounted on a vehicle such as an electric vehicle, an insulating paper (slot paper) is arranged in a slot of a substantially ring-shaped stator core in which steel plates are stacked, and a coil is assembled. , The one manufactured by the manufacturing method of curing the varnish by dropping the varnish, impregnating it, and heating it is widely used. As a method of dropping the varnish in this case, for example, a method of dropping the varnish from the axial direction of the stator core to the coil end portion is known (see Patent Document 1).

JP-A-2019-170105

However, in the stator described in Patent Document 1, most of the varnish dropped on the coil end portion during manufacturing flows downward between the coil and the insulating paper along the coil. On the other hand, the varnish transmitted through the coil is difficult to enter between the slot and the insulating paper, and the rigidity of the stator after the varnish is cured may be reduced.

Therefore, it is an object of the present invention to provide a stator and a method for manufacturing the stator which can improve the rigidity.

This stator has an annular stator core having a plurality of teeth arranged in the circumferential direction on the inner peripheral surface side and forming a plurality of slots between the adjacent teeth, and a slot of a portion housed in the slot. A coil having an accommodating portion and a projecting portion of a portion projecting in the axial direction of the central axis of the stator core in succession to the slot accommodating portion, and a plurality of the projecting portions are combined to form a coil end portion as an aggregate. And a plurality of insulating papers arranged between the inner wall surface of the slot and the slot accommodating portion of the coil and having a paper edge portion protruding in the axial direction from the slot, and impregnated into the slot and cured. The varnish, the annular portion arranged on the inner peripheral surface side of the coil end portion, and the annular portion protruding from the annular portion and arranged on the axial end surface side of the teeth and adjacent to each other in the circumferential direction. An annular member having a protrusion having a shape that penetrates between the edges of the paper is provided.

Further, in the method for manufacturing the present stator, a ring-shaped stator core having a plurality of teeth arranged in the circumferential direction on the inner peripheral surface side and having a plurality of slots formed between the adjacent teeth and a ring-shaped stator core are housed in the slots. A coil having a slot accommodating portion of the formed portion and a protruding portion of a portion projecting in the axial direction of the central axis of the stator core continuously from the slot accommodating portion, an inner wall surface of the slot, and the slot accommodating portion of the coil. A stator having a plurality of insulating papers arranged between the above and having a paper end portion protruding in the axial direction from the slot, and the plurality of the protruding portions are combined to form a coil end portion as an aggregate. In the manufacturing method, the annular portion of the annular member having the annular portion and the protrusion protruding from the annular portion is assembled to the inner peripheral surface side of the coil end portion, and the shaft of the teeth is assembled. An annular member assembling step in which the protrusion is inserted between the paper ends adjacent to each other in the circumferential direction on the end face side in the direction, and a dropping step in which the varnish is dropped onto the coil end portion from the axial direction. To be equipped.

According to the present stator and the method for manufacturing the stator, the rigidity can be improved.

The perspective view of the stator which concerns on 1st Embodiment. The side view which shows the 1st protrusion of the 1st annular member which concerns on 1st Embodiment. The perspective view of the 1st annular member which concerns on 1st Embodiment. It is a perspective view of the 1st annular member which concerns on 1st Embodiment, (a) is a 1st protrusion, (b) is a 1st groove part. FIG. 3 is a perspective view of a first inclined portion of the first annular member according to the first embodiment. The perspective view of the 1st engaging part of the 1st annular member which concerns on 1st Embodiment. FIG. 5 is a perspective view in which the vicinity of the first groove portion of the first annular member is cut in the stator according to the first embodiment. The side view of FIG. FIG. 5 is a perspective view in which the vicinity of the first engaging portion of the first annular member is cut in the stator according to the first embodiment. The flowchart which shows the manufacturing method of the stator which concerns on 1st Embodiment. It is a side view which shows the shape of the paper end portion of the slot paper which concerns on 1st Embodiment, (a) is the shape which is not bent, (b) is the shape which is bent in the first direction. The perspective view of the stator which concerns on 2nd Embodiment. The perspective view which shows the 1st annular member which concerns on 2nd Embodiment. The perspective view which shows the 1st protrusion and the paper edge part of the 1st annular member which concerns on 2nd Embodiment. FIG. 5 is a cross-sectional view showing a first protrusion and a paper edge portion of the first annular member according to the second embodiment. The perspective view which shows the 1st protrusion which concerns on 2nd Embodiment.

<First Embodiment>
Hereinafter, the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11. In this embodiment, the stator is used, for example, in a three-phase AC motor.

[Constituent configuration]
First, the configuration of the stator 1 will be described with reference to FIG. The stator 1 is formed in a substantially annular shape, and includes a stator core 10, a coil set 20, a slot paper 30 (see FIG. 2) which is an example of insulating paper, and a first annular member 40 which is an example of an annular member. It has a second annular member 41 and a hardened varnish. The stator core 10, the coil set 20, the slot paper 30, the first annular member 40, and the second annular member 41 are integrally fixed by a varnish impregnated and cured in the slot 14 (inside the slot), which will be described later.

The stator core 10 is formed by laminating substantially ring-shaped electromagnetic steel plates, and on the outer peripheral side thereof, ribs 11 and bolt holes 12 for fixing the stator core 10 to a motor case (not shown), and an inner peripheral surface 10a It has a plurality of teeth 13 arranged in the circumferential direction provided on the side (see FIG. 7) (inner peripheral surface side). A plurality of slots 14 for accommodating the coil set 20 are formed between the adjacent teeth 13 (between the teeth).

The coil set 20 is an aggregate of a plurality of coils 21, and the coils 21 wound around a flat conducting wire having a rectangular cross section are arranged in an annular shape while being shifted by one tooth while being shifted in the circumferential direction. Is formed in. The flat conductor is formed by covering the entire circumference of a conductor portion made of copper or the like with an insulating coating material such as enamel.

As shown in FIG. 2, the coil 21 protrudes in the axial direction Z of the central axis C (see FIG. 1) of the stator core 10 continuously with the slot accommodating portion 22 of the portion accommodated in the slot 14 and the slot accommodating portion 22. It has a protruding portion 23 of the formed portion. In the present embodiment, a plurality of protruding portions 23 are combined to form a coil end portion 24 as an aggregate. A space portion 15 is formed between the end surface 13a on the first direction D1 side (first direction side) of the teeth 13 and the coil end portion 24.

The slot papers 30 are provided in each slot 14 and are arranged in the circumferential direction. The slot paper 30 is provided by being folded into a substantially channel shape with the inner peripheral side of the stator core 10 open so as to cover the inner wall surface of the slot 14 when viewed from the axial direction Z. The slot paper 30 is an example of a paper edge portion that is arranged between the inner wall surface 14a of the slot 14 and the slot accommodating portion 22 and projects from the slot 14 to the first direction D1 side that is one side of the axial direction Z. It has one paper edge 31 and a second paper edge (not shown) protruding in the second direction D2 opposite to the first direction D1. The first paper end portion 31 is folded in the second direction D2 side (second direction side) in the space portion 15 on the first direction D1 side of the teeth 13 to prevent the slot paper 30 from falling off in the axial direction Z. It is preventing.

[Ring road member]
Next, the first annular member 40 will be described in detail with reference to FIGS. 1 to 9. As shown in FIG. 1, the first annular member 40 has a substantially annular shape and is provided concentrically with the central axis C of the stator core 10 on the first direction D1 side of the stator core 10. In the present embodiment, the first annular member 40 is made of a resin such as PPS. However, it is not limited to being formed of resin, and may be made of metal, for example. As shown in FIGS. 3 and 4A, the first annular member 40 has a substantially annular first annular portion 42 and a first protrusion 43.

In the present embodiment, the first protrusion 43 is formed so as to project from the first ring portion 42 in the axial direction Z, and has a substantially triangular shape when viewed from the radial direction. As shown in FIGS. 7 and 8, the first annular portion 42 is provided so as to abut on the inner diameter side of the coil end portion 24 on the first direction D1 side of the slot 14. As shown in FIG. 2, the first protrusion 43 projects from the first ring portion 42 toward the second direction D2. The first protrusion 43 has a shape that fits between the first paper end portions 31 of the adjacent slot papers 30. That is, the first protrusion 43 is held in a state where the space between the first paper end portions 31 of the adjacent slot papers 30 is open so that the space between the first paper end portions 31 is not closed.

As a result, the varnish W dropped on the coil end portion 24 during the manufacture of the stator 1 travels through the coil 21 to reach the first annular member 40, travels from the first annular portion 42 to the first protrusion 43, and is adjacent to each other. It is possible to improve the rigidity of the stator 1 by entering between the first paper end portions 31 of the slot paper 30 and impregnating between the teeth 13 and the slot paper 30. Further, as shown in FIG. 7, since the first protrusion 43 enters the space portion 15 on the first direction D1 side of the teeth 13, the flow of the varnish W trying to flow through the space portion 15 to the inner diameter side is obstructed. It suppresses leakage from the stator core 10 to the inner diameter side.

Further, in the present embodiment, as shown in FIG. 1, the first annular member 40 is mounted on the inner peripheral side of the coil end portion 24. Then, as shown in FIG. 8, in the first annular member 40, the innermost peripheral portion 22a of the slot accommodating portion 22 of the coil 21 (see FIG. 1) has a tip gap (predetermined) with respect to the inner peripheral surface 10a of the stator core 10. It also functions as a regulating member that has an interval (G) and regulates the position on the outer peripheral side.

As shown in FIG. 3, the first annular member 40 includes a first groove 44 as an example of a groove, a first inclined portion 45 as an example of an inclined portion, and a first engaging portion as an example of an engaging portion. It has 46 and. As shown in FIGS. 3, 4 (b), and 5 (a), the first groove portion 44 penetrates the outer portion of the first annular portion 42 along the axial direction Z, and is on the side of the first protrusion 43. The end portion (on the protrusion side) is formed in a groove shape facing the first protrusion 43. In the present embodiment, the direction of the first groove portion 44 is parallel to the axial direction Z, and the first groove portion 44 and the first protrusion 43 are aligned with each other in the circumferential direction. As a result, as shown in FIG. 7, the varnish W dropped on the coil end portion 24 during the manufacture of the stator 1 travels through the coil 21 and reaches the first annular member 40, and the first groove portion of the first annular portion 42. It travels from 44 through the first protrusion 43, enters between the first paper ends 31 of the adjacent slot papers 30, and impregnates between the teeth 13 and the slot paper 30.

The first inclined portion 45 is provided at an end portion on the outer peripheral side on the first direction D1 side, and has a shape inclined toward the outer peripheral side toward the second direction D2 side. As a result, as shown in FIG. 8, the varnish W dropped on the coil end portion 24 during the manufacture of the stator 1 travels through the coil 21 and reaches the first annular member 40, and the first inclination of the first annular portion 42 Since it is transmitted to the outer peripheral side along the portion 45, it is suppressed from leaking from the stator core 10 to the inner diameter side.

As shown in FIGS. 3 and 6, the first engaging portion 46 is radially engaged with the space portion 15 formed between the end surface 13a on the first direction D1 side of the teeth 13 and the coil end portion 24. It is provided as possible. The first engaging portions 46 are provided at three locations at equal intervals in the circumferential direction, for example. As shown in FIG. 9, by engaging the first engaging portion 46 with the space portion 15, the first annular member 40 can be positioned and fixed to the inner peripheral side of the coil end portion 24 before being fixed with the varnish. can.

The second annular member 41 mounted on the second direction D2 side of the stator core 10 has a ring-shaped second annular portion (not shown) and a second annular portion (not shown) protruding from the second annular portion in the axial direction Z. It has protrusions. Further, each of the second annular member 41 has a second groove portion (not shown), a second inclined portion, and a second engaging portion. The second annular member 41 has the same configuration as the first annular member 40, and the second annular portion, the second protrusion, the second groove portion, the second inclined portion, and the second engaging portion are each a first annular member. Since the configuration is the same as that of the portion 42, the first protrusion 43, the first groove portion 44, the first inclined portion 45, and the first engaging portion 46, detailed description thereof will be omitted.

In the present embodiment, the inner diameter of the first annular portion 42 of the first annular member 40 is larger than the inner diameter of the stator core 10, and the inner diameter of the second annular portion of the second annular member 41 is larger than the inner diameter of the stator core 10. .. That is, both the first annular member 40 and the second annular member 41 are provided on the outer peripheral side of the inner peripheral surface 10a of the stator core 10 when viewed from the axial direction Z. Therefore, the rotor can be mounted on the stator 1 from either the first direction D1 side or the second direction D2 side. That is, in order to mount the rotor on the stator 1, at least one of the first annular member 40 and the second annular member 41 is provided on the outer peripheral side of the inner peripheral surface 10a of the stator core 10 when viewed from the axial direction Z.

[Manufacturing method of stator]
By the way, as shown in FIGS. 1 and 2, when manufacturing the stator, a varnish is applied to the stator core 10 in which the first annular member 40 and the second annular member 41 are not provided from the axial direction Z to the coil end portion 24. When dropped on the varnish, most of the varnish flows downward through the coil 21 between the slot accommodating portion 22 of the coil 21 and the slot paper 30. The varnish transmitted through the coil 21 is difficult to enter between the slot 14 and the slot paper 30, and the rigidity of the stator 1 after the varnish is cured may be reduced. Further, a part of the varnish dropped on the coil end portion 24 may flow along the coil 21 in the radial direction and leak to the outside from the inner peripheral surface or the outer peripheral surface of the stator core 10. There is a risk that the yield during manufacturing of the stator 1 will deteriorate. Therefore, in the present embodiment, the varnish easily flows between the slot 14 and the slot paper 30, and is prevented from leaking from the stator core 10 in the radial direction.

Hereinafter, the method for manufacturing the stator according to the present embodiment will be described with reference to the flowchart shown in FIG. First, a plurality of coils 21 are assembled to the stator core 10 (step S1). Specifically, first, a coil set 20 in which a plurality of coils 21 are combined in an annular shape is formed. The slot paper 30 is mounted in the slot 14. The coil set 20 is arranged in the space on the inner diameter side of the stator core 10. By moving the plurality of coils 21 to the outer diameter side, the coils 21 are arranged inside the slot paper 30 arranged in the slot 14. Here, the case where the slot paper 30 is arranged in the slot 14 in advance before the coil 21 is arranged in the slot 14 will be described, but the present invention is not limited to this, and the slot paper 30 is attached to the coil set 20. Later, it may be arranged in the slot 14 together with the coil set 20.

The first annular member 40 and the second annular member 41 are assembled to the stator core 10 to which the coil 21 is assembled (step S2, annular member assembling step).

Next, the stator core 10 to which the coil 21 is assembled is preheated (step S3). Specifically, the entire stator core 10 is preheated to, for example, about 100 ° C.

After preheating, a varnish for fixing the coil 21 to the stator core 10 is dropped from the axial direction Z onto the coil end portion 24 (step S4, dropping step). First, as shown in FIG. 7, the varnish W is dropped on the coil end portion 24 from the first direction D1 side (upper side). The dropping of the varnish W is performed in a state where the stator core 10 is arranged so that the central axis C of the stator core 10 is along the axial direction Z. The varnish W dropped on the coil end portion 24 reaches the first annular member 40 from the upper side to the lower side of the coil 21 due to the capillary phenomenon and gravity, and is guided to the outer peripheral side by the inclined portion 45. It travels from the first groove 44 of the ring portion 42 through the first protrusion 43, enters between the first paper end portions 31 of the adjacent slot papers 30, and impregnates between the teeth 13 and the slot paper 30. Further, since the first protrusion 43 enters the space portion 15 on the first direction D1 side of the teeth 13, the flow of the varnish W trying to flow through the space portion 15 to the inner diameter side is obstructed, and the leakage from the stator core 10 to the inner diameter side. Suppress the release.

After the varnish W is dropped and the predetermined time elapses, the dropping of the varnish W is temporarily stopped, the stator core 10 is turned upside down, and the varnish is dropped again. As a result, the varnish W is dropped from the second direction D2 side to the coil end portion 24 on the second direction D2 side. The varnish W dropped on the coil end portion 24 reaches the second annular member 41 and is impregnated between the teeth 13 and the slot paper 30 from the second direction D2 side.

Then, the varnish is cured by heating the stator core 10 (step S5). Here, the stator core 10 is heated to, for example, about 140 ° C. The varnish is cured by heating at about 140 ° C. for several minutes. The stator 1 can be manufactured by executing steps S1 to S5 described above.

As described above, according to the stator 1 of the present embodiment, the first protrusion 43 of the first annular member 40 has a shape that is inserted between the first paper ends 31 of the adjacent slot papers 30. The varnish W dropped on the coil end portion 24 during the production of 1 travels through the coil 21 to reach the first annular member 40, travels from the first annular portion 42 to the first protrusion 43, and is transmitted from the adjacent slot paper 30 to the adjacent slot paper 30. It can be inserted between the edges 31 of the first paper and impregnated between the teeth 13 and the slot paper 30. As a result, the varnish can easily flow between the slot 14 and the slot paper 30, so that the rigidity of the stator 1 can be improved.

Further, according to the stator 1 of the present embodiment, the first protrusion 43 has a shape protruding from the first ring portion 42 toward the second direction D2. Therefore, the varnish W that flows down along the first annular portion 42 is easily collected by the first protrusion 43, so that the varnish W can be easily flowed between the slot 14 and the slot paper 30.

Further, according to the stator 1 of the present embodiment, in the first annular member 40, the innermost peripheral portion 22a of the slot accommodating portion 22 of the coil 21 has a tip gap G with respect to the inner peripheral surface 10a of the stator core 10. It also functions as a regulating member that regulates the position on the outer peripheral side. Therefore, by securing the tip gap G, iron loss of the motor can be suppressed.

Further, according to the method for manufacturing the stator 1 of the present embodiment, the varnish W that tries to distribute the space portion 15 to the inner diameter side by inserting the first protrusion 43 into the space portion 15 on the first direction D1 side of the teeth 13. Since it is possible to obstruct the flow of the water, it is possible to prevent leakage from the stator core 10 to the inner diameter side. As a result, it is possible to suppress a decrease in the yield during manufacturing of the stator 1 due to leakage of the varnish.

In the above-described embodiment, as shown in FIG. 2, the case where the first paper edge portion 31 has a shape folded toward the second direction D2 side has been described, but the present invention is not limited to this. For example, as shown in FIG. 11A, the first paper end portion (paper end portion) 32 of the slot paper 30 may have a shape extending in the first direction D1 without being bent, or as shown in FIG. 11B. As shown, the first paper edge portion (paper edge portion) 33 may be folded in the first direction D1 side. In either case, the first protrusion 43 of the first annular member 40 is inserted between the first paper end portions 31 of the adjacent slot papers 30 to hold the gap between the first paper edges 31 and the first paper edge. It is possible to prevent the space between the parts 31 from closing.

Further, in the present embodiment, the case where the first protrusion 43 has a substantially triangular shape when viewed from the radial direction has been described, but the present invention is not limited to this. For example, if the first paper end portion 32 has a shape as shown in FIG. 11A, the first protrusion 43 may have a substantially trapezoidal shape or a substantially square shape when viewed from the radial direction.

Further, in the present embodiment, the case where the first annular member 40 is mounted on the inner peripheral side of the coil end portion 24 has been described, but the present invention is not limited to this. For example, the first annular member 40 may be mounted on the outer peripheral side of the coil end portion 24. In this case, since the first protrusion 43 enters the space portion 15 on the first direction D1 side of the teeth 13 to obstruct the flow of the varnish W trying to circulate the space portion 15 to the outer diameter side, it is outside the stator core 10. It is possible to suppress leakage to the diameter side.

Further, in the present embodiment, the inner diameter of the first annular portion 42 of the first annular member 40 is larger than the inner diameter of the stator core 10, and the inner diameter of the second annular portion of the second annular member 41 is larger than the inner diameter of the stator core 10. However, it is not limited to this. For example, the inner diameter of one of the first ring portion 42 and the second ring portion may be smaller than the inner diameter of the stator core 10. That is, in order to mount the rotor on the stator 1, at least one of the first annular member 40 and the second annular member 41 may be larger than the inner diameter of the stator core 10.

Further, in the present embodiment, the varnish W dropping step is executed after assembling the first annular member 40 and the second annular member 41, and in the dropping step, the stator core 10 is turned upside down to the first direction D1 side and the first. The case where the varnish W is dropped in order from the two-way D2 side has been described, but the present invention is not limited to this. For example, the first annular member 40 is assembled, the second annular member 41 is not assembled, and the varnish W dropping step is executed. Then, the second annular member 41 may be assembled to drop the varnish W only from the second direction D2 side.

<Second embodiment>
Next, the stator 101 of the second embodiment of the present disclosure will be described with reference to FIGS. 12 to 16. The present embodiment is different from the first embodiment in that the first annular member 140 has a first protrusion 143 facing the outer peripheral side in the radial direction. However, since the other configurations are the same as those in the first embodiment, the same reference numerals are given and detailed description thereof will be omitted.

As shown in FIG. 12, the first annular member 140 of the present embodiment has a substantially annular shape and is provided concentrically with the central axis C of the stator core 10 on the first direction D1 side of the stator core 10. In the present embodiment, the first annular member 140 is made of a resin such as PPS. However, it is not limited to being formed of resin, and may be made of metal, for example. As shown in FIG. 13, the first annular member 140 has a substantially annular-shaped first annular portion 142 and a first protrusion 143.

As shown in FIG. 14, the first protrusion 143 is provided in contact with the inner diameter direction X1 side of the coil end portion 24 on the first direction D1 side of the slot 14 (see FIG. 1). Further, the end surface 142a of the first annular portion 142 on the second direction D2 side abuts on the end surface 13a of the teeth 13 on the first direction D1 side. As a result, the flow of the varnish that tries to flow through the space portion 15 on the first direction D1 side of the teeth 13 to the inner diameter direction X1 side is obstructed, and leakage from the stator core 10 to the inner diameter direction X1 side is suppressed.

As shown in FIG. 15, the first protrusion 143 is formed in a shape protruding in the radial direction X from the first ring portion 142. In the present embodiment, the first protrusion 143 has a shape protruding from the outer peripheral surface of the first ring portion 142 toward the outer diameter direction X2. The first protrusion 143 has a shape that fits between the first paper end portions 31 of the adjacent slot papers 30. That is, the first protrusion 143 is held in a state where the space between the first paper end portions 31 of the adjacent slot papers 30 is open so that the space between the first paper end portions 31 is not closed.

As a result, the varnish dropped on the coil end portion 24 during the manufacture of the stator 101 travels through the coil 21 to reach the first annular member 140, travels from the first annular portion 142 through the first protrusion 143, and is adjacent to the slots. It is possible to improve the rigidity of the stator 101 by entering between the first paper end portions 31 of the paper 30 and impregnating between the teeth 13 and the slot paper 30.

Further, in the present embodiment, the first annular member 140 is mounted on the inner peripheral side of the coil end portion 24. Then, as shown in FIG. 14, in the first annular member 140, the innermost peripheral portion 22a of the slot accommodating portion 22 of the coil 21 has a tip gap (predetermined interval) G with respect to the inner peripheral surface 10a of the stator core 10. It also functions as a regulating member that regulates the position on the outer peripheral side.

As shown in FIG. 16, the first protrusion 143 of the first annular member 140 is located at the end on the outer diameter direction X2 side on the second direction D2 side, and on the outer diameter direction X2 side toward the first direction D1 side. It has a first inclined portion 145 having an inclined shape. Further, the first protrusion 143 is formed with chamfered portions 147 at two edge portions along the axial direction Z on the outer diameter direction X2 side, respectively. As a result, when the first annular member 140 is mounted on the coil end portion 24 along the axial direction Z during the manufacture of the stator 101, the first inclined portion 145 and the chamfered portion 147 of the first protrusion 143 are adjacent to each other. It can be easily inserted between the first paper edges 31 of the paper 30. The varnish dropped on the coil end portion 24 travels through the coil 21 to reach the first annular member 140, travels through the first protrusion 143 of the first annular portion 142, and reaches the first paper end portion of the adjacent slot paper 30. It enters between 31 and impregnates between the teeth 13 and the slot paper 30.

Further, as in the first embodiment, as shown in FIG. 12, the second annular member 141 mounted on the second direction D2 side of the stator core 10 has a ring-shaped second annular portion (not shown). It has a second protrusion (not shown) that protrudes from the second ring portion to the X2 side in the outer radial direction. Since the second annular member 141 has the same configuration as the first annular member 140, detailed description thereof will be omitted. Further, also in the present embodiment, the inner diameter of the first annular portion 142 of the first annular member 140 is larger than the inner diameter of the stator core 10, and the inner diameter of the second annular portion of the second annular member 141 is larger than the inner diameter of the stator core 10. doing. That is, both the first annular member 140 and the second annular member 141 are provided on the outer peripheral side of the inner peripheral surface 10a of the stator core 10 when viewed from the axial direction Z. Therefore, the rotor can be mounted on the stator 1 from either the first direction D1 side or the second direction D2 side.

As described above, according to the stator 101 of the present embodiment, the first protrusion 143 of the first annular member 140 has a shape that is inserted between the first paper end portions 31 of the adjacent slot papers 30. The varnish W dropped on the coil end portion 24 during the production of 1 travels through the coil 21 to reach the first annular member 140, travels from the first annular portion 142 through the first protrusion 143, and is transmitted from the adjacent slot papers 30 to the first annular member 140. It can be inserted between the edges 31 of the first paper and impregnated between the teeth 13 and the slot paper 30. As a result, the varnish can easily flow between the slot 14 and the slot paper 30, so that the rigidity of the stator 101 can be improved.

Further, according to the stator 101 of the present embodiment, the first protrusion 143 has a shape protruding from the first annular portion 142 toward the outer diameter direction X2. Therefore, the varnish that flows down along the first annular portion 142 is easily collected by the first protrusion 143, so that the varnish can be easily flowed between the slot 14 and the slot paper 30.

<Summary of each embodiment>
It should be noted that each of the above-described embodiments includes at least the following configurations. The stators (1,101) of each embodiment have a plurality of teeth (13) arranged in the circumferential direction on the inner peripheral surface (10a) side, and a plurality of slots (14) are provided between the adjacent teeth (13). ), The slot accommodating portion (22) of the portion accommodated in the slot (14), and the center of the stator core (10) continuous with the slot accommodating portion (22). A coil having a protruding portion (23) of a portion protruding in the axial direction (Z) of the shaft (C), and a plurality of the protruding portions (23) are combined to form a coil end portion (24) as an aggregate. (21), a paper arranged between the inner wall surface (14a) of the slot (14) and the slot accommodating portion (22) of the coil (21), and protruding in the axial direction from the slot (14). A plurality of insulating papers (30) having ends (31, 32, 33), a varnish (W) impregnated and cured in the slot (14), and an inner peripheral surface side of the coil end (24). (42, 142) arranged in the ring portion (42, 142) and projecting from the annular portion (42, 142), arranged on the side of the tooth (13) on the end surface (13a) in the axial direction (Z). An annular member (40, 41, 140, 141) having a protrusion (43,143) having a shape inserted between the paper edges (31, 32, 33) adjacent to each other in the circumferential direction is provided.

According to this configuration, the protrusions (43,143) of the annular member (40,41,140,141) have a shape that fits between the adjacent paper edges (31,32,33) in the circumferential direction. The varnish (W) dropped on the coil end portion (24) during the manufacture of the stator (1,101) travels along the coil (21) to reach the annular member (40, 41, 140, 141) and reaches the annular portion (40, 41, 140, 141). From 42,142), it travels through the protrusions (43,143), enters between the adjacent paper edges (31,32,33) in the circumferential direction, and is between the teeth (13) and the insulating paper (30). Can be impregnated. As a result, the varnish (W) can easily flow between the slot (14) and the insulating paper (30), so that the rigidity of the stator (1,101) can be improved.

Further, in the stator (1) of the first embodiment, the protrusion (43) has a shape protruding from the annular portion (42) toward the stator core (10) in the axial direction (Z). According to this configuration, the varnish (W) flowing down along the annulus (42) is easily collected by the protrusion (43), and the varnish (W) is placed between the slot (14) and the insulating paper (30). Since it can easily flow in, the rigidity of the stator (1) can be improved.

Further, in the stator (1) of the first embodiment, the annular portion (42) has the innermost peripheral portion (22a) of the slot accommodating portion (22) of the coil (21) the stator core (10). It is a shape that regulates the position on the outer peripheral side with a predetermined distance from the inner peripheral surface (10a) of the above. According to this configuration, in the annular member (40, 41), the innermost peripheral portion (22a) of the slot accommodating portion (22) of the coil (21) is predetermined with respect to the inner peripheral surface (10a) of the stator core (10). It can function as a regulating member that regulates the position on the outer peripheral side with an interval (G) of. Therefore, by securing a predetermined interval (G), iron loss of the motor can be suppressed.

Further, in the stator (1) of the first embodiment, the annular member (40, 41) has a groove portion (44) penetrating the outer portion in the radial direction along the axial direction (Z). The end of the groove (44) on the protrusion (43) side faces the protrusion (43). According to this configuration, the varnish (W) dropped on the coil end portion (24) during the manufacture of the stator (1) reaches the annular member (40, 41) along the coil (21) and reaches the annular portion (40, 41). From the groove (44) of 42), it travels through the protrusion (43), enters between the adjacent paper edges (31, 32, 33), and impregnates between the teeth (13) and the insulating paper (30). Can be done. As a result, the varnish (W) can easily flow between the slot (14) and the insulating paper (30), so that the rigidity of the stator (1) can be improved.

Further, in the stator (1) of the first embodiment, the annular member (40, 41) has the stator core (40, 41) at the end on the outer peripheral side opposite to the stator core (10) in the axial direction (Z). It has an inclined portion (45) that inclines toward the outer peripheral side toward the side of 10). According to this configuration, the varnish (W) dropped on the coil end portion (24) during the manufacture of the stator (1) reaches the annular member (40, 41) along the coil (21) and reaches the annular portion (40, 41). Since it is flowed to the outer peripheral side along the inclined portion (45) of 42), it is possible to suppress leakage from the stator core (10) to the inner diameter side. As a result, it is possible to suppress a decrease in the yield during manufacturing of the stator (1) due to leakage of the varnish (W).

Further, in the stator (1) of the first embodiment, the annular member (40, 41) has the end face (13a) of the teeth (13) in the axial direction (Z) and the coil end portion (24). It has an engaging portion (46) that is radially engaged with the space portion (15) formed between the two. According to this configuration, by engaging the engaging portion (46) with the space portion (15), the annular member (40, 41) is placed in the coil end portion (24) before being fixed by the varnish (W). Since it can be positioned and fixed on the peripheral side, workability during dropping and curing of the varnish (W) can be improved.

Further, in the stator (101) of the second embodiment, the protrusion (143) protrudes in the radial direction from the outer peripheral surface of the annular portion (142) toward the inner peripheral surface of the coil end portion (24). Shape. According to this configuration, the varnish (W) flowing down along the annulus (142) is easily collected by the protrusion (143), and the varnish (W) is placed between the slot (14) and the insulating paper (30). Since it can easily flow in, the rigidity of the stator (101) can be improved.

Further, in the stator (101) of the second embodiment, the protrusion (143) has the innermost peripheral portion (22a) of the slot accommodating portion (22) of the coil (21) inside the stator core (10). It is a shape that regulates the position on the outer peripheral side with a predetermined distance from the peripheral surface (10a). According to this configuration, in the annular member (140, 141), the innermost peripheral portion (22a) of the slot accommodating portion (22) of the coil (21) is predetermined with respect to the inner peripheral surface (10a) of the stator core (10). It can function as a regulating member that regulates the position on the outer peripheral side with an interval (G) of. Therefore, by securing a predetermined interval (G), iron loss of the motor can be suppressed.

Further, in the stator (101) of the second embodiment, the end surface (142a) of the annular portion (142) on the side of the stator core (10) in the axial direction (Z) is the said of the teeth (13). It abuts on the end face (13a) in the axial direction (Z). According to this configuration, since the end faces (142a, 13a) of the annular member (140, 141) and the stator core (10) abut against each other in the axial direction (Z), the varnish is formed between the end faces (142a, 13a). It is possible to reduce the leakage of (W) in the radial direction.

Further, in the stator (1,101) of each embodiment, the inner diameter of the annular portion (42, 142) is larger than the inner diameter of the stator core (10). According to this configuration, the rotor can be reliably mounted, and restrictions on the component dimensions can be reduced for the annular members (40, 41, 140, 141) on the side where the rotor is not mounted.

Further, in the stators (1,101) of each embodiment, the insulating paper (30) protrudes from the slot (14) toward the first direction (D1) in the axial direction, and the paper end portions (31, 32). , 33), and a second paper edge projecting in the second direction (D2) opposite to the first direction (D1) in the axial direction (Z). The annular member (40, 41, 140, 141) has a first annular portion (42, 142) which is the annular portion (42, 142) and a first projection which is the protrusion (43, 143). It is a first annular member (40,140) having (43,143), and is arranged on the inner peripheral surface side of the coil end portion (24) on the second direction (D2) side of the slot (14). The second ring portion and the second ring portion that protrudes from the second ring portion and is arranged on the end surface (13a) side of the teeth (13) in the second direction (D2) and is adjacent to each other in the circumferential direction. It includes a second annular member (41, 141) having a second protrusion having a shape that is inserted between the two paper edges. According to this configuration, annular members (40, 41, 140, 141) can be provided on both sides of the stator core (10) in the first direction (D1) and the second direction (D2).

Further, in the stator (1,101) of each embodiment, the inner diameter of at least one of the first annulus portion (42,142) and the second annulus portion is larger than the inner diameter of the stator core (10). According to this configuration, the rotor can be reliably mounted, and restrictions on the component dimensions can be reduced for the annular members (40, 41, 140, 141) on the side where the rotor is not mounted.

Further, in the method for manufacturing the stator (1,101) of each embodiment, a plurality of teeth (13) arranged in the circumferential direction are provided on the inner peripheral surface (10a) side, and between the adjacent teeth (13). The stator core (10) having a ring shape forming a plurality of slots (14), and the slot accommodating portion (22) and the slot accommodating portion (22) of the portion accommodated in the slot (14) are continuously connected to the stator core. The coil (21) having a protruding portion (23) of a portion protruding in the axial direction of the central axis (C) of (10), the inner wall surface (14a) of the slot (14), and the coil (21). A plurality of insulating papers (30) arranged between the slot accommodating portion (22) and having paper edge portions (31, 32, 33) protruding in the axial direction from the slot (14). In a method for manufacturing a stator (1,101) in which a plurality of protruding portions (23) are combined to form a coil end portion (24) as an aggregate, an annular portion (42, 142) and the annular portion are formed. The annular portion (42, 142) of the annular member (40, 41, 140, 141) having the protrusion (43, 143) protruding from the portion (42, 142) is inside the coil end portion (24). Assembling to the peripheral surface side, the teeth (13) are on the side of the axial direction (Z) end surface (13a), and are located between the paper end portions (31, 32, 33) adjacent to each other in the circumferential direction. It includes an annular member assembling step in which the protrusions (43,143) are inserted, and a dropping step in which the varnish (W) is dropped onto the coil end portion (24) from the axial direction (Z).

According to this configuration, the protrusions (43,143) of the annular member (40,41,140,141) are inserted between the paper edges (31,32,33) of the adjacent insulating papers (30). Therefore, the varnish (W) dropped on the coil end portion (24) during the manufacture of the stator (1,101) travels through the coil (21) and reaches the annular member (40, 41, 140, 141), and forms an annulus. It travels from the portion (42, 142) through the protrusion (43, 143) and enters between the paper edges (31, 32, 33) of the adjacent insulating paper (30), and enters between the teeth (13) and the insulating paper (30). ) Can be impregnated. As a result, the varnish (W) can easily flow between the slot (14) and the insulating paper (30), so that the rigidity of the stator (1,101) can be improved.

Further, since the protrusions (43,143) are inserted into the first direction (D1) side of the teeth (13), the flow of the varnish (W) to be distributed to the inner diameter side can be obstructed, so that the diameter from the stator core (10) is increased. It is possible to suppress leakage in the direction. As a result, it is possible to suppress a decrease in the yield during manufacturing of the stator (1,101) due to leakage of the varnish (W).

1,101 ... Stator 10 ... Stator core 10a ... Inner peripheral surface 13 ... Teeth 13a ... End surface 14 ... Slot 14a ... Inner wall surface 15 ... Space part 21 ... Coil 22 ... Slot accommodating part 22a ... Innermost peripheral part 23 ... Protruding part 24 ... Coil end 30 ... Slot paper (insulated paper)
31, 32, 33 ... 1st paper edge (paper edge)
40, 140 ... First annular member (annular member)
41, 141 ... Second annular member (annular member)
42, 142 ... 1st annulus (annulus)
43, 143 ... 1st protrusion (protrusion)
44 ... 1st groove (groove)
45 ... First inclined portion (inclined portion)
46 ... First engaging portion (engaging portion)
142a ... End face C ... Central axis D1 ... First direction D2 ... Second direction G ... Tip gap (predetermined interval)
W ... Varnish Z ... Axial direction

Claims (13)

An annular stator core having a plurality of teeth arranged in the circumferential direction on the inner peripheral surface side and forming a plurality of slots between the adjacent teeth.
It has a slot accommodating portion of a portion accommodated in the slot and a projecting portion of a portion continuously protruding from the slot accommodating portion in the axial direction of the central axis of the stator core, and a plurality of the projecting portions are combined to form an aggregate. With the coil that formed the coil end part as
A plurality of insulating papers arranged between the inner wall surface of the slot and the slot accommodating portion of the coil and having a paper edge portion protruding from the slot in the axial direction.
The varnish impregnated and cured in the slot,
An annular portion arranged on the inner peripheral surface side of the coil end portion and a paper end portion protruding from the annular portion and arranged on the axial end surface side of the teeth and adjacent to each other in the circumferential direction. A stator comprising an annular member having a recessed protrusion. The stator according to claim 1, wherein the protrusion has a shape protruding from the ring portion toward the stator core in the axial direction. Claim 1 is a shape in which the innermost peripheral portion of the slot accommodating portion of the coil is regulated so as to be located on the outer peripheral side with a predetermined distance from the inner peripheral surface of the stator core. Or the stator according to 2. The stator according to claim 3, wherein the annular member has a groove portion that penetrates an outer portion in the radial direction along the axial direction, and the groove portion has an end portion on the protrusion side facing the protrusion. The stator according to claim 3 or 4, wherein the annular member has an inclined portion that is inclined toward the outer peripheral side toward the side of the stator core at an end portion on the outer peripheral side opposite to the stator core in the axial direction. .. Any one of claims 1 to 5, wherein the annular member has an engaging portion that is radially engaged with a space portion formed between the axial end surface of the tooth and the coil end portion. The stator described in. The stator according to claim 1, wherein the protrusion has a shape protruding in the radial direction from the outer peripheral surface of the annular portion toward the inner peripheral surface of the coil end portion. The seventh aspect of claim 7, wherein the protrusion regulates the innermost peripheral portion of the slot accommodating portion of the coil so as to be located on the outer peripheral side with a predetermined distance from the inner peripheral surface of the stator core. Stator. The stator according to claim 7 or 8, wherein the end surface of the ring portion on the side of the stator core in the axial direction abuts on the end surface of the teeth in the axial direction. The stator according to any one of claims 1 to 9, wherein the inner diameter of the annular portion is larger than the inner diameter of the stator core. The insulating paper protrudes from the slot in the first paper end portion, which is the paper end portion protruding in the first direction side in the axial direction, and in the second direction side opposite to the first direction in the axial direction. It has a second paper edge and
The annular member is a first annular member having a first annular portion which is the annular portion and a first projection which is the protrusion.
A second annulus portion arranged on the inner peripheral surface side of the coil end portion on the second direction side of the slot, and a side of the end surface of the tooth in the second direction so as to project from the second annulus portion. The stator according to any one of claims 1 to 10, further comprising a second annular member having a second protrusion having a shape of being arranged between the edges of the second paper adjacent to each other in the circumferential direction. The stator according to claim 11, wherein the inner diameter of at least one of the first annulus portion and the second annulus portion is larger than the inner diameter of the stator core. An annular stator core having a plurality of teeth arranged in the circumferential direction on the inner peripheral surface side and forming a plurality of slots between the adjacent teeth, a slot accommodating portion of a portion accommodated in the slot, and the above. A coil having a portion protruding in the axial direction of the central axis of the stator core continuously connected to the slot accommodating portion, and the slot accommodating portion arranged between the inner wall surface of the slot and the slot accommodating portion of the coil. In a method for manufacturing a stator, which comprises a plurality of insulating papers having paper edges protruding in the axial direction from the above, and a plurality of the protruding portions are combined to form a coil end portion as an aggregate.
The annular portion of the annular member having the annular portion and the protrusion protruding from the annular portion is assembled to the inner peripheral surface side of the coil end portion, and the end surface of the teeth in the axial direction is assembled. An annular member assembling step in which the protrusion is inserted between the paper edges adjacent to each other in the circumferential direction on the side.
A method for manufacturing a stator, comprising a dropping step of dropping varnish on the coil end portion from the axial direction.

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