JP7117154B2 - motor stator and motor - Google Patents

Description

The present invention relates to a stator for a motor that includes a stator core and coils distributed around the stator core. It also relates to a motor having such a stator and rotor.

A stator for a motor comprising a stator core and a coil distributedly wound around the stator core is described in Patent Document 1. The stator core includes an annular portion and a plurality of salient pole portions projecting inward from the annular portion. A plurality of slots are defined on the inner peripheral side of the annular portion by two circumferentially adjacent salient pole portions and the annular portion. A plurality of slots are arranged in the circumferential direction. The coil includes a first coil portion and a second coil portion that are inserted into two different slots and extend in the axial direction of the stator core, and a first coil portion and a second coil portion that are routed in the circumferential direction on one side of the stator core in the axial direction. A first routed coil portion that connects the two coil portions, and a second routed coil portion on the other side that is routed in the circumferential direction on the other side of the stator core in the axial direction and connects the first coil portion and the second coil portion. And prepare.

Patent Literature 2 describes insulating paper that is inserted into slots to insulate a stator core and a coil. The first type of insulating paper described in Document 2 includes folded portions that are double-folded at both ends in the axial direction of the stator core. In addition, the insulating paper of the second form described in Cited Document 2 includes folded portions that are folded four times at both ends in the axial direction of the stator core. When the insulating paper is inserted into the slot, the folded portion located on one side in the axial direction protrudes from the slot in the one side in the axial direction. Further, when the insulating paper is inserted into the slot, the folded portion located at the other axial groove protrudes from the slot toward the other axial side.

JP 2011-229248 A JP-A-60-162951

When the insulating paper described in Cited Document 2 is used to insulate the stator core and the coil distributedly wound around the stator core, the folded portion on one side of the insulating paper is in the axial direction of the first winding portion of the coil and the stator core. It will be in a crushed state between the end face on one side. Also, the folded portion of the insulating paper on the other side is crushed between the second winding portion of the coil and the end surface of the stator core on the other side.

Here, when the folded portion of the insulating paper is double, the folded portion is likely to be crushed. Therefore, the routed coil portion of the coil is likely to come into contact with the end surface of the stator core, and the insulation between the coil and the stator core may become unreliable.

On the other hand, when the folded portion of the insulating paper is four folds, the folded portion is less likely to be crushed. Therefore, contact between the coil and the stator core can be avoided, and it is easy to ensure insulation therebetween. However, since the folded portion is not crushed between the lead coil portion of the coil and the end surface of the stator core, the lead coil portion is spaced apart from the stator core in the axial direction. Therefore, when the insulating paper is folded four times, there arises a problem that the size of the stator increases in the axial direction.

Here, by pressing the routed coil portion of the coil against the stator core side with a strong force to crush the folded portion, it is possible to suppress an increase in the size of the stator in the axial direction. However, since the folded portion is less likely to be crushed, there is a possibility that the coil may break when the routed coil portion is pressed against the stator core.

In view of the above problems, an object of the present invention is to provide a motor stator that can easily ensure insulation between the distributed winding coil and the stator core, and can prevent or suppress an increase in size in the axial direction. . Another object of the present invention is to provide a motor having such a stator.

In order to solve the above problems, a stator of a motor according to the present invention includes a stator core including an annular portion and a plurality of salient pole portions projecting inwardly from the annular portion; a coil distributed around the stator core; insulating paper for insulating the stator core and the coil, and a plurality of slots are formed on the inner peripheral side of the annular portion by the two adjacent salient pole portions and the annular portion in the circumferential direction of the stator core. The coil is divided into a first coil portion and a second coil portion that are inserted into the two different slots and extend in the axial direction of the stator core, and a side of the stator core in the first axial direction. A first routed coil portion that is routed in the circumferential direction to connect the first coil portion and the second coil portion, and a side of the stator core in a second direction opposite to the first direction are arranged in the circumferential direction. a second routed coil portion that is routed to connect the first coil portion and the second coil portion,
The insulating paper includes a slot insertion portion positioned inside the slot, and a first folded portion triple-folded on the side of the slot insertion portion in the first direction. The folded portion includes an inner folded portion extending from the edge of the insulating paper toward the stator core, an outer folded portion overlapping the inner folded portion from the side where the stator core is positioned, and the inner folded portion. an inner folded portion that overlaps the overlapping portion from the side opposite to the stator core; a first bent portion positioned between the inner folded portion and the outer folded portion; and the outer folded portion. and a second bent portion positioned between the inner folded portion and the inner folded portion, wherein the inner folded portion is continuous with the slot insertion portion, and the first folded portion extends from the stator core. It protrudes in the first direction and is crushed between the first lead coil portion and the stator core , and the first folded portion is crushed between the first lead coil portion and the stator core. In this state, the outer folded portion is in contact with the first end face of the stator core in the first direction, and the inner folded portion is formed between the outer folded portion and the inner folded portion. characterized by being sandwiched between

According to the present invention, the first folded portion of the insulating paper is crushed between the stator core and the first lead-out coil portion of the coil pulled out in the first direction from the slot and wound in the circumferential direction. Therefore, compared to the case where the first folded portion is not crushed between the first lead-out coil portion and the stator core, the stator can be made smaller in the axial direction. Here, since the first folded portion is folded three times, it is thicker even when it is crushed, compared to the case where the first folded portion is double. Therefore, it is easy to avoid contact of the first lead-out coil portion of the coil with the stator core. Therefore, it becomes easy to ensure insulation between the coil and the stator core. Also, since the first folded portion is folded three times, it is more likely to be crushed than when the first folded portion is four times. Therefore, it is easy to crush the first folded portion by pressing the first lead-out coil portion of the coil against the stator core side. In addition, since the first lead coil portion is easily crushed, it is possible to prevent or reduce the occurrence of wire breakage in the coil when the first lead coil portion is pressed against the stator core side.

In the present invention, it is preferable that the first bent portion is in contact with the first end surface of the stator core in the first direction. With this configuration, the axial position of the insulating paper to be inserted into the slot can be defined by the contact between the first bent portion and the stator core. Further, when the first lead-out coil portion of the distributed-wound coil is pressed toward the stator core, it is possible to prevent or suppress the movement of the first folded portion toward the inside of the slot.

In the present invention, the insulating paper includes a central portion extending in the circumferential direction, a one side portion extending radially inward from one end of the central portion in the circumferential direction, and the other side of the central portion in the circumferential direction. The other side portion extending inwardly from a side end, a one side fold line between the center portion and the one side portion, and the other side fold line between the center portion and the other side portion. , the first folded portion may be provided continuously to end portions in the first direction of the central portion, the one side portion, and the other side portion. With this configuration, the insulating paper can be provided with the first folded portion by folding the end portion of the insulating paper twice. Moreover, since the insulating paper is folded in the circumferential direction, it is possible to prevent the folded portion from being opened.

In the present invention, a second insulating paper for insulating the stator core and the coil is provided. a one-side contact portion that extends from one end in the circumferential direction to the outer peripheral side and contacts the one-side portion of the insulating paper from the side opposite to the stator core; a second side contact portion that extends to the outer peripheral side and contacts the other side portion of the insulating paper from a side opposite to the stator core, and a protruding portion that protrudes from the stator core in the first direction, The protruding portion is provided continuously at end portions in the first direction of the blocking portion, the one-side contact portion, and the other-side contact portion, and is provided between the first lead-out coil portion and the stator core. It can be crushed. By doing so, it is easy to ensure insulation between the coil and the stator core by the insulating paper and the second insulating paper.

In the present invention, the one-side contact portion may be in contact with the one-side fold line, and the other-side contact portion may be in contact with the other-side fold line. By doing so, it is possible to secure a contact area between the one-side portion of the insulating paper and the one-side contact portion of the second insulating paper. Also, the contact area between the other side portion of the insulating paper and the other side contact portion of the second insulating paper can be ensured. Therefore, it is possible to prevent the insulating paper and the second insulating paper from moving in the slot. Therefore, the insulating paper and the second insulating paper can easily prevent contact between the coil and the stator core.

In the present invention, the insulating paper includes a second folded portion that is triple-folded on the second direction side of the slot insertion portion, and the second folded portion extends from the stator core to the It is desirable that it protrudes in the second direction and is crushed between the second lead-out coil portion and the stator core. With this configuration, the second folded portion of the insulating paper is crushed between the second lead-out coil portion of the coil and the stator core on the second direction side of the stator core. Therefore, the stator can be made smaller in the axial direction than when the second folded portion is not crushed between the second lead-out coil portion and the stator core. Also, since the second folded portion is folded three times, it is thicker even when it is crushed, compared to the case where the second folded portion is double. Therefore, it is easy to avoid contact of the second lead-out coil portion of the coil with the stator core. Therefore, it becomes easy to ensure insulation between the coil and the stator core. Also, since the second folded portion is folded three times, it is more likely to be crushed than when the second folded portion is four times. Therefore, it is easy to crush the second folded portion by pressing the second lead-out coil portion of the coil against the stator core side. In addition, since the second lead-out coil portion is easily crushed, it is possible to prevent or reduce the occurrence of wire breakage in the coil when the second lead-out coil portion is pressed against the stator core side.

Next, the motor of the present invention includes the above-described stator, and a magnet portion in which S poles and N poles are alternately arranged in the circumferential direction, and is rotatably arranged on the inner peripheral side of the plurality of salient pole portions. and a rotor.

According to the motor of the present invention, it is easy to ensure insulation between the coil and the stator core in the stator. In addition, since it is possible to suppress the increase in size of the stator in the axial direction, it is possible to prevent or suppress the increase in the size of the motor in the axial direction.

ADVANTAGE OF THE INVENTION According to this invention, in a stator, the insulation of a coil and a stator core can be ensured. In addition, it is possible to suppress an increase in the size of the stator in the axial direction. Therefore, it is possible to prevent or suppress the increase in size of the motor in the axial direction.

1 is a schematic configuration diagram of a motor to which the present invention is applied; FIG. FIG. 2 is a cross-sectional view of the stator of the motor of FIG. 1 cut along the axis; 3 is an exploded perspective view of the stator; FIG. FIG. 4 is an explanatory diagram of a first insulating paper; FIG. 4 is a perspective view of the stator core with the first insulating paper set thereon; FIG. 3 is a cross-sectional view of the stator cut along a plane perpendicular to the axis; 4 is a flow chart of a method for manufacturing a stator;

Embodiments of a stator of a motor to which the present invention is applied and a motor to which the present invention is applied will be described below with reference to the drawings.

(motor)
FIG. 1 is a schematic configuration diagram of a motor to which the present invention is applied. FIG. 2 is a cross-sectional view of the stator of the motor of FIG. 1 cut along the axis. In FIGS. 1 and 2, the number of turns of the coil and the like are shown in a simplified manner. A motor 1 of this example includes an annular stator 2 and a rotor 3 arranged on the inner peripheral side of the stator 2 . The rotor 3 is rotatable around a predetermined axis L. As shown in FIG. That is, the rotor 3 is rotatably supported around the axis L by bearings (not shown). Motor 1 is a three-phase DC motor.

The stator 2 includes a stator core 5 having an annular portion 6 and a plurality of salient pole portions 7 projecting inward from the annular portion 6 , and a plurality of coils 10 distributed around the stator core 5 . In this example, the stator core 5 has six salient poles 7 . The stator 2 also has three coils 10 . Six slots 8 are partitioned on the inner peripheral side of the annular portion 6 by two adjacent salient pole portions 7 and the annular portion 6 in the circumferential direction of the stator core 5 . The slots 8 are arranged circumferentially around the axis L at equal angular intervals. In the following description, the direction along the axis L of the motor 1 is the X direction (axial direction), one of the X directions is the first direction X1, and the other is the second direction X2. In addition, the direction perpendicular to the axis L is defined as the radial direction, and the circumference of the axis L is defined as the circumferential direction.

As shown in FIG. 2 , each coil 10 includes a first coil portion 11 and a second coil portion 12 that are inserted into two different slots 8 and extend in the X direction of the stator core 5, and a coil portion that extends in the first direction X1 of the stator core 5. A first coil portion 13 that connects the first coil portion 11 and the second coil portion 12 by circumferentially extending the side of the stator core 5 and connecting the first coil portion 11 and the second coil portion 12, and a second A second lead-out coil portion 14 connecting the first coil portion 11 and the second coil portion 12 is provided. In this example, the first coil portion 11 and the second coil portion 12 are inserted into two slots 8 facing each other with the axis L therebetween.

A first insulating paper 17 (insulating paper) for insulating the coil 10 and the stator core 5 is inserted into each slot 8 . Furthermore, a second insulating paper 18 (second insulating paper) for insulating the coil 10 and the stator core 5 is inserted in each slot 8 .

The rotor 3 has, on its outer peripheral surface, an annular magnet portion 21 in which S poles and N poles are alternately arranged in the circumferential direction. The magnet portion 21 is polarized into two poles in the circumferential direction, and the N pole and the S pole are magnetized. Alternatively, the magnet portion 21 is polarized into four poles in the circumferential direction, and the S pole and the N pole are alternately magnetized. The stator core 5 is coaxial with the axis L here. That is, the axis of the stator core 5 is the axis L of the motor 1, and the inner peripheral surface of each salient pole portion 7 of the stator core 5 and the magnet portion 21 face each other with a narrow gap therebetween. The rotor 3 rotates around the axis L by magnetizing the coils 10 of the stator 2 .

(First insulating paper and second insulating paper)
FIG. 3 is an exploded perspective view of the stator 2. FIG. FIG. 3 shows the stator 2 , one coil 10 distributedly wound around the stator 2 , and the first insulating paper 17 and the second insulating paper 18 inserted into one slot 8 . In FIG. 3, the number of turns of the coil 10 and the like are shown in a simplified manner. FIG. 4 is an explanatory diagram of the first insulating paper 17. As shown in FIG. 5 is a perspective view of the stator core 5 with the first insulating paper 17 inserted into the two slots 8. FIG. FIG. 6 is a cross-sectional view of the stator 2 cut along a plane perpendicular to the axis L. As shown in FIG.

As shown in FIGS. 2 and 3, the first insulating paper 17 inserted into each slot 8 has a slot inserting portion 30 located inside the slot 8 and 3 slots on the side of the slot inserting portion 30 in the first direction X1. It includes a first folded portion 31 that is heavily folded and a second folded portion 32 that is triple folded on the side of the slot insertion portion 30 in the second direction X2. As shown in FIG. 4 , the first folded portion 31 includes an inner folded portion 35 extending from the edge of the first insulating paper 17 toward the stator core 5 in the second direction X2, and an inner folded portion 35 . An outer folded portion 36 that overlaps from the side where the stator core 5 is located, an inner folded portion 37 that overlaps the inner folded portion 35 from the side opposite to the stator core 5, the inner folded portion 35 and the outer folded portion. 36, and a second bent portion 39 positioned between the outer folded portion 36 and the inner folded portion 37. As shown in FIG. The outer folded portion 36 is arranged outside the slot 8 with respect to the inside around which the coil 10 is wound. The inner folded portion 37 is arranged inside the slot 8 around which the coil 10 is wound. The inner peripheral folded portion 37 is continuous with the slot insertion portion 30 .

The second folded portion 32 has a structure similar to that of the first folded portion 31 . That is, the second folded portion 32 includes an inner folded portion 35 extending from the edge of the first insulating paper 17 toward the stator core 5 side, and an outer peripheral side overlapping the inner folded portion 35 from the side where the stator core 5 is positioned. A folded portion 36, an inner folded portion 37 overlapping the inner folded portion 35 from the side opposite to the stator core 5, and a first bend located between the inner folded portion 35 and the outer folded portion 36. and a second bent portion 39 positioned between the outer folded portion 36 and the inner folded portion 37 . The inner peripheral folded portion 37 is continuous with the slot insertion portion 30 .

Further, as shown in FIGS. 3 and 4A, the first insulating paper 17 includes a central portion 40 extending in the circumferential direction and one side extending radially inward from one end of the central portion 40 in the circumferential direction. A portion 41, a second side portion 42 extending inwardly from the other circumferential end of the central portion 40, a one side fold line 43 between the central portion 40 and the one side portion 41, the central portion 40 and the other side portion. and the other side fold line 44 between the side portions 42 . Here, the first folded portion 31 is provided continuously at the ends of the central portion 40, the one side portion 41, and the other side portion 42 in the first direction X1. The second folded portion 32 is provided continuously at the ends of the central portion 40, the one side portion 41, and the other side portion 42 in the second direction X2. The slot insertion portion 30 is provided continuously between the first folded portion 31 and the second folded portion 32 at the central portion 40 , the one side portion 41 and the other side portion 42 .

As shown in FIG. 5, when the first insulating paper 17 is inserted into the slot 8, the first folded portion 31 protrudes from the stator core 5 in the first direction X1. More specifically, the first bent portion 38 of the first folded portion 31 abuts against the first end face 5a of the stator core 5 in the first direction X1 and is locked to the first end face 5a. Also, when the first insulating paper 17 is inserted into the slot 8, the second folded portion 32 protrudes from the stator core 5 in the second direction X2. Although not shown, the first bent portion 38 of the second folded portion 32 abuts against the second end surface 5b of the stator core 5 in the second direction X2 and is locked to the second end surface 5b. .

A second insulating paper 18 is then inserted inside the first insulating paper 17 in each slot 8, as shown in FIG. As shown in FIG. 3, the second insulating paper 18 includes a blocking portion 50 that blocks the opening 8a on the inner peripheral side of the slot 8, and a first insulating paper 18 that extends from one end of the blocking portion 50 in the circumferential direction to the outer peripheral side. A one-side contact portion 51 that contacts the one-side portion 41 of the insulating paper 17 from the side opposite to the stator core 5 , and the other side of the first insulating paper 17 that extends from the other end in the circumferential direction of the block portion 50 to the outer peripheral side. The portion 42 is provided with the other side contact portion 52 that contacts the stator core 5 from the opposite side.

Also, as shown in FIG. 2, the second absolute paper includes a second slot inserting portion 56 located inside the slot 8, a first projecting portion 57 projecting from the stator core 5 in the first direction X1, a stator core 5 A second projecting portion 58 projecting in the second direction X2 from is provided. In addition, the second insulating paper 18 is not folded at the first projecting portion 57 and the second projecting portion 58 . Also, the X-direction dimension of the first protrusion 57 is shorter than the X-direction dimension of the first folded portion 31 of the first insulating paper 17 , and the X-direction dimension of the second protrusion 58 is the same as that of the first insulating paper 17 . is shorter than the dimension in the X direction of the second folded portion 32.

As shown in FIG. 3 , the first projecting portion 57 is provided continuously at end portions of the blocking portion 50, the one-side contact portion 51, and the other-side contact portion 52 in the first direction X1. The second projecting portion 58 is provided continuously at the ends of the blocking portion 50, the one-side contact portion 51, and the other-side contact portion 52 in the second direction X2. The second slot insertion portion 56 is provided continuously between the first projecting portion 57 and the second projecting portion 58 in the blocking portion 50 , the one side contact portion 51 and the other side contact portion 52 .

Here, as shown in FIG. 5 , when the second insulating paper 18 is inserted into the slot 8 , the one-side contact portion 51 contacts the one-side folded line 43 of the first insulating paper 17 . In other words, the outer edge 51 a of the one-side contact portion 51 reaches the one-side folding line 43 of the first insulating paper 17 . Also, the second insulating paper 18 contacts the other side folding line 44 of the first insulating paper 17 when the second insulating paper 18 is inserted into the slot 8 . In other words, the outer edge 52 a of the other contact portion 52 reaches the other fold line 44 of the first insulating paper 17 .

Further, as shown in FIG. 2, the first folded portion 31 of the first insulating paper 17 and the first protruding portion 57 of the second insulating paper 18 are connected to the first lead-out coil portion 13 and the stator core 5 (first end face 5a). It is crushed between The second folded portion 32 of the first insulating paper 17 and the second projecting portion 58 of the second insulating paper 18 are crushed between the second lead-out coil portion 14 and the stator core 5 (second end face 5b).

(Manufacturing method of stator)
FIG. 7 is a flow chart of a method for manufacturing the stator 2. FIG. When manufacturing the stator 2, first, the first insulating paper 17 is inserted into each of the two slots 8 into which one coil 10 is inserted (step ST1).

Here, as shown in FIG. 4( a ), in the first insulating paper 17 , the end portion of the flat first insulating paper 17 in the first direction X1 is valley-folded twice to form a triple first fold. An overlapping portion 31 is formed. Also, in the first insulating paper 17, the second folded portion 32 is formed in three folds by folding the end portion of the first insulating paper 17 in the second direction X2 twice. Furthermore, in the first insulating paper 17, by bending both sides of the first insulating paper 17 in the circumferential direction, the central portion 40, the one-side portion 41, the other-side portion 42, the one-side fold line 43, and A folding line 44 on the other side is formed.

The first insulating paper 17 is inserted into the slot 8 from the X direction (axis L direction). Then, as shown in FIG. 5 , the first bent portion 38 of the first folded portion 31 of the first insulating paper 17 is locked to the first end surface 5 a of the stator core 5 . Also, the first bent portion 38 of the second folded portion 32 of the first insulating paper 17 is locked to the second end surface 5 b of the stator core 5 . Thereby, the first insulating paper 17 is supported by the stator core 5 while being positioned in the X direction.

Next, the coils 10 are inserted into the two slots 8 from the inner peripheral side (step ST2). That is, the coil 10 is inserted into the slot 8 through the opening 8a on the inner peripheral side of the slot 8. As shown in FIG. As a result, the coil 10 is provided with a first coil portion 11 and a second coil portion 12 extending in the X direction within each slot 8, as shown in FIG.

After that, the second insulating paper 18 is inserted into the slot 8 from the X direction (the direction of the axis L) (step ST3). More specifically, while avoiding the coil 10, the second insulating paper 18 is inserted into the inner peripheral side of the first insulating paper 17 (the side opposite to the stator core 5).

As shown in FIG. 3, the second insulating paper 18 is provided with a blocking portion 50, a one-side contact portion 51, and a other-side contact portion 52 by bending both sides in the circumferential direction toward the outer circumference. Then, when inserting the second insulating paper 18 inside the first insulating paper 17, as shown in FIG. 17 is brought into contact with the bent line 43 on one side. Also, the edge 52 a of the outer periphery of the contact portion 52 on the other side of the second insulating paper 18 is brought into contact with the folding line 44 on the other side of the first insulating paper 17 .

Next, the coil 10 is temporarily folded by pushing it toward the stator core 5 from both sides in the X direction (step ST4). As a result, the first lead-out coil portion 13 that connects the first coil portion 11 and the second coil portion 12 on the first direction X1 side of the stator core 5 in the coil 10 is arranged along the first end face 5a of the stator core 5. It is pulled around in the circumferential direction. Also, the first folded portion 31 of the first insulating paper 17 and the first projecting portion 57 of the second insulating paper are crushed between the first lead-out coil portion 13 and the first end surface 5a of the stator core 5. state. Similarly, in the coil 10, the second lead-out coil portion 14 connecting the first coil portion 11 and the second coil portion 12 on the side of the stator core 5 in the second direction X2 is arranged along the second end face 5b of the stator core 5. It is pulled around in the circumferential direction. The second folded portion 32 of the first insulating paper 17 and the second projecting portion 58 of the second insulating paper are crushed between the second lead-out coil portion 14 and the second end surface 5b of the stator core 5. state.

After that, for the other two coils 10, the above steps ST1 to ST4 are performed. That is, the first insulating paper 17 is inserted into the slot 8 and the coil 10 is inserted into the slot 8 . After that, the second insulating paper 18 is inserted into the slot 8, and the coil 10 is temporarily folded by pushing it toward the stator core 5 from both sides in the X direction.

After the temporary folding of all the coils 10 is completed, all the coils 10 are again pressed against the stator core 5 from above and below so as to be crushed (step ST5). This completes the stator 2 .

(Effect)
According to this example, the first folded portion 31 of the first insulating paper 17 is pulled out from the slot 8 in the first direction X1, and the stator core 5 and the first drawn coil portion 13 of the coil 10 drawn in the circumferential direction. It is crushed between Therefore, the stator 2 can be made smaller in the X direction than when the first folded portion 31 is not crushed between the first lead coil portion 13 and the stator core 5 . Here, since the first folded portion 31 is folded three times, the first folded portion 31 is thicker even when crushed, compared to the case where the first folded portion 31 is double. Therefore, it is easy to avoid contact of the first lead-out coil portion 13 of the coil 10 with the stator core 5 . Therefore, it becomes easy to ensure insulation between the coil 10 and the stator core 5 . Moreover, since the first folded portion 31 is folded three times, it is more likely to be crushed than when the first folded portion 31 is four times. Therefore, by pressing the first lead-out coil portion 13 of the coil 10 against the stator core 5 side, the first folded portion 31 can be easily crushed. In addition, since the first lead coil portion 13 is easily crushed, it is possible to prevent or reduce the occurrence of wire breakage in the coil 10 when the first lead coil portion 13 is pressed against the stator core 5 side.

Further, the second folded portion 32 of the first insulating paper 17 is formed between the stator core 5 and the second lead-out coil portion 14 of the coil 10 drawn out in the second direction X2 from the slot 8 and routed in the circumferential direction. It's crushed. Therefore, compared to the case where the second folded portion 32 is not crushed between the second lead coil portion 14 and the stator core 5, the stator 2 can be made smaller in the X direction. Moreover, since the second folded portion 32 is folded three times, it is thicker even when it is crushed, compared to the case where the second folded portion 32 is double. Therefore, it is easy to avoid contact of the second lead-out coil portion 14 of the coil 10 with the stator core 5 . Therefore, it becomes easy to ensure insulation between the coil 10 and the stator core 5 . In addition, since the second folded portion 32 is folded three times, it is more likely to be crushed than when the second folded portion 32 is four times. Therefore, by pressing the second lead-out coil portion 14 of the coil 10 against the stator core 5 side, it is easy to crush the second folded portion 32 . In addition, since the second lead coil portion 14 is easily crushed, it is possible to prevent or reduce the occurrence of wire breakage in the coil 10 when the second lead coil portion 14 is pressed against the stator core 5 side.

In this example, the first bent portion 38 of the first folded portion 31 is in contact with the first end face 5a of the stator core 5 in the first direction X1. A first bent portion 38 of the second folded portion 32 is in contact with the second end surface 5b of the stator core 5 in the second direction X2. This defines the X-direction position of the first insulating paper 17 inserted into the slot 8 .

In each of the first folded portion 31 and the second folded portion 32 , the first bent portion 38 is in contact with the stator core 5 . Therefore, when the first lead-out coil portion 13 of the coil 10 is pressed toward the stator core 5 side, the first folded portion 31 can be prevented or suppressed from moving inside the slot 8 . Similarly, when the second lead-out coil portion 14 of the coil 10 is pressed toward the stator core 5 side, the movement of the second folded portion 32 to the inside of the slot 8 can be prevented or suppressed.

Furthermore, in this example, the first folded portion 31 can be provided in the first insulating paper 17 by folding the end portion of the first insulating paper 17 in the first direction X1 twice. Moreover, since the first insulating paper 17 is folded in the circumferential direction, it is possible to prevent the first folded portion 31 from opening. Similarly, the second folded portion 32 can be provided in the first insulating paper 17 by folding the end portion of the first insulating paper 17 in the second direction X2 twice. Moreover, since the first insulating paper 17 is folded in the circumferential direction, it is possible to prevent the second folded portion 32 from opening.

Moreover, in this example, the second insulating paper 18 for insulating the stator core 5 and the coil 10 is provided. The first projecting portion 57 of the second insulating paper 18 is crushed between the first lead-out coil portion 13 and the stator core 5 . The second projecting portion 58 of the second insulating paper 18 is crushed between the second lead-out coil portion 14 and the stator core 5 . Therefore, it is easy to ensure insulation between the coil 10 and the stator core 5 by the first insulating paper 17 and the second insulating paper 18 .

Further, the one-side contact portion 51 of the second insulating paper 18 contacts the one-side folding line 43 of the first insulating paper 17 , and the other-side contact portion 52 contacts the other-side folding line 44 of the first insulating paper 17 . Thereby, the contact area between the one-side portion 41 of the first insulating paper 17 and the one-side contact portion 51 of the second insulating paper 18 can be secured. Also, the contact area between the other side portion 42 of the first insulating paper 17 and the other side contact portion 52 of the second insulating paper 18 can be ensured. Therefore, it is possible to prevent the first insulating paper 17 and the second insulating paper 18 from moving within the slot 8 . Therefore, contact between the coil 10 and the stator core 5 can be easily prevented by the first insulating paper 17 and the second insulating paper 18 .

Further, in the motor 1 of this example, it is easy to ensure insulation between the coil 10 and the stator core 5 in the stator 2 . In addition, since the stator 2 can be prevented from increasing in size in the X direction, it is possible to prevent or suppress the motor 1 from increasing in size in the X direction.

Reference Signs List 1 Motor 2 Stator 3 Rotor 5 Stator core 5a First end surface 5b Second end surface 6 Annular portion 7 Salient pole portion 8 Slot 8a Opening 10 Coil , 11... First coil part, 12... Second coil part, 13... First lead coil part, 14... Second lead coil part, 17... First insulating paper (insulating paper), 18... Second insulating paper (second 2 insulating paper), 21... magnet part, 30... slot insertion part, 31... first folded part, 32... second folded part, 35... inner folded part, 36... outer peripheral side folded part, 37... Inner peripheral side folded portion 38 First bending portion 39 Second bending portion 40 Central portion 41 One side portion 42 Other side portion 43 One side broken line 44 Other side broken line 50... Blocking part 51... One side contact part 52... Other side contact part 56... Second slot insertion part 57... First projecting part 58... Second projecting part X... Axial direction X1... First direction, X2...second direction

Claims (7)

a stator core including an annular portion and a plurality of salient pole portions projecting inwardly from the annular portion;
a coil distributedly wound around the stator core;
and insulating paper for insulating the stator core and the coil,
A plurality of slots are defined on the inner peripheral side of the annular portion by two adjacent salient pole portions in the circumferential direction of the stator core and the annular portion,
The coil includes a first coil portion and a second coil portion that are inserted into the two different slots and extend in the axial direction of the stator core, and a side of the stator core that extends in the first axial direction in the circumferential direction. A first lead-out coil portion that is turned to connect the first coil portion and the second coil portion, and a side of the stator core facing a second direction opposite to the first direction are drawn around in the circumferential direction. a second routing coil portion that connects the first coil portion and the second coil portion;
The insulating paper includes a slot insertion portion positioned inside the slot, and a first folded portion triple-folded on the side of the slot insertion portion in the first direction,
The first folded portion includes an inner folded portion extending from an edge of the insulating paper toward the stator core, an outer peripheral folded portion overlapping the inner folded portion from the side where the stator core is positioned, an inner folded portion that overlaps the inner folded portion from the side opposite to the stator core; a first bent portion that is positioned between the inner folded portion and the outer folded portion; and the outer folded portion. a second bent portion positioned between the overlapped portion and the folded portion on the inner peripheral side;
The inner peripheral side folded portion is continuous with the slot insertion portion,
The first folded portion protrudes from the stator core in the first direction and is crushed between the first lead-out coil portion and the stator core ,
In a state in which the first folded portion is crushed between the first lead-out coil portion and the stator core, the outer peripheral side folded portion is in contact with the first end surface of the stator core in the first direction. 2. A stator for a motor , wherein said inner folded portion is sandwiched between said outer peripheral folded portion and said inner peripheral folded portion . 2. The stator of a motor according to claim 1 , wherein the first bent portion is in contact with the first end surface of the stator core in the first direction. The insulating paper has a central portion extending in the circumferential direction, a one side portion extending radially inward from one end of the central portion in the circumferential direction, and an end on the other circumferential side of the central portion. The other side portion extending to the inner peripheral side, the one side folding line between the central portion and the one side portion, and the other side folding line between the central portion and the other side portion,
3. The first folded portion according to claim 1 or 2, wherein the first folded portion is provided continuously to end portions of the central portion, the one side portion, and the other side portion in the first direction. motor stator. a second insulating paper for insulating the stator core and the coil;
The second insulating paper includes a blocking portion that blocks the opening on the inner peripheral side of the slot, and an end of the blocking portion on one side in the circumferential direction that extends outward to the one side portion of the insulating paper. a one-side contact portion that contacts the stator core from the side opposite to the stator core, and a contact portion that extends outward from the other end of the blocking portion in the circumferential direction and contacts the other side portion of the insulating paper from the side opposite to the stator core. and a projecting portion projecting from the stator core in the first direction,
The protruding portion is provided continuously at end portions in the first direction of the blocking portion, the one-side contact portion, and the other-side contact portion, and is provided between the first lead-out coil portion and the stator core. 4. The stator of a motor according to claim 3, wherein the stator is crushed by . The one-side contact portion is in contact with the one-side fold line,
5. The stator of a motor according to claim 4, wherein said other side contact portion is in contact with said other side folding line. the insulating paper includes a second folded portion that is triple-folded on the side of the slot insertion portion in the second direction;
6. The second folded portion protrudes from the stator core in the second direction and is collapsed between the second lead-out coil portion and the stator core. A stator of a motor according to any one of the preceding claims. a stator as claimed in any one of claims 1 to 6;
a rotor comprising a magnet portion in which S poles and N poles are alternately arranged in the circumferential direction, the rotor being rotatably arranged on the inner peripheral side of the plurality of salient pole portions;
A motor comprising:

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