JPH1198722A - Armature of dynamoelectric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a layer short-circuit which is caused by mutual contact between coil sides inserted into a slot and a grounding which is caused by the mutual contact between the coil side and the wall of the slot. SOLUTION: Retreating parts 12 are provided at both the corners of a bottom part in a slot 4. The retreating parts 12 are so formed as to be recessed into circular-arc shapes, in order to avoid the interferences with the inner circumference side corner parts 6a of a lower layer coil side 6A. As a result of this construction, even if the lower layer coil side 6A is twisted or distorted by the variations in the shape of the slot 4, the dimensions of a lower layer coil, lower layer slot insulating paper 8, etc., and the variations in processes, etc., the inner circumference side corner part 6a of the lower layer coil side 6A does not break the lower layer slot insulating paper 8 and bring itself into direct contact with the inner wall (a bottom surface 4a and a side surface 4b) of the slot 4 and a locally applied excessive load can be avoided. With this constitution, a grounding due to the contact between the lower layer coil side 6A and the inner wall of the slot can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an armature of a rotating electric machine.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Application Laid-Open No. 8-51748 is disclosed.
Patent Application, "Armature of Commutator Type Rotating Electric Machine"
There is an armature described in "Method of Manufacturing Rotor of Rotating Electric Machine" in U.S. Pat. As shown in FIG. 5, the armature includes a substantially U-shaped lower coil conductor 6 and an upper coil conductor 7 which are assembled to the armature core 3, and the lower coil conductor 6A is insulated by a lower slot. After a predetermined number of lower coil conductors 6 are inserted into the slots 4 of the armature core 3 from the radial outside of the armature core 3 together with the paper 8 to assemble the armature core 3 (see FIG. 20), the upper coil The coil side 7A of the conductor 7 is inserted into the slot 4 together with the upper slot insulating paper 10 to assemble a predetermined number of the upper coil conductors 7 into the armature core 3. Finally, a pair of upper coil conductors 7 provided on both sides of the opening of the slot 4 are provided. The caulking claw 5 is tilted to the slot 4 side and caulked and fixed.

[0003]

The above-mentioned coil conductors 6 and 7 are provided with coil sides 6A and 7 inserted into the slots 4.
Since the cross-sectional shape of A is square, if it is formed by drawing like the armature coil having a conventionally known round cross-section, the cross-sectional shape is stable, but the cost is high. For this reason, it is shaped by, for example, cutting out from a plate material or die processing. However, burrs are generated at the time of cutting or punching from a plate material, but it is difficult to completely remove the burrs because the shapes of the coil conductors 6 and 7 are complicated. The lower coil side 6A is connected to the lower slot insulating paper 8.
If the positioning of the armature core 3 and the positioning of the lower coil side 6A and the lower slot insulating paper 8 to be inserted into the slot 4 are not performed correctly when inserted into the slot 4 as shown in FIG. , Lower slot insulating paper 8
The lower coil side 6A is formed at the entrance corner 4A of the slot 4 through
And the lower slot insulating paper 8 may be damaged.

On the other hand, each coil side 6A, 7A is
When the caulking claws 5 provided on both sides of the opening of the slot 4 are caulked and fixed after being inserted into the inside, the caulking load of the right and left caulking claws 5 may be unbalanced. In this case, for example, as shown in FIG. 22, the lower coil side 6A to be inserted into the slot 4 is assembled in a twisted or twisted state, and the lower coil side 6A is assembled in the circumferential direction (the left-right direction in FIG. ), The lower coil side 6A is biased,
The wall surface of the slot 4 is locally pressed by the inner peripheral corner 6a of the lower coil side 6A via the lower layer insulating paper 8, or the upper slot insulating paper 10 is locally pressed by the outer peripheral corner 6b of the lower coil side 6A. Pressed. In such a case, if the aforementioned burrs remain at the corners 6a and 6b of the lower coil side 6A, the burrs cause the lower slot insulating paper 8
In addition, the upper slot insulating paper 10 may be damaged.
If the lower slot insulating paper 8 is already damaged when the lower coil side 6A is inserted into the slot 4 as described above, an excessive pressing force is applied to the lower slot insulating paper 8 so that the lower slot insulating paper 8 may be damaged. The paper 8 may be torn.

Further, when the dimensions (particularly the width of the root of the tooth) of each slot tooth 15 vary due to the processing accuracy of the slot 4, when the imbalance of the swaging load of the right and left swaging claws 5 becomes large, the slot tooth 15 becomes large.
May buckle from the root (see FIG. 23). In this case, as shown in FIG. 23, the lower slot insulating paper 8 and the upper slot insulating paper 10 surrounding the upper coil side 7A.
Is locally pressed against the outer peripheral corner 7b of the upper coil side 7A by the buckled slot teeth 15, so that the lower slot insulating paper 8 and the upper slot insulating paper 10
Could be destroyed. As a result, the coil side 6A of the lower coil conductor 6 and the coil side 7A of the upper coil conductor 7
A contacts with A to induce rare, and each coil side 6A, 7
The problem that A touches the wall surface of the slot 4 to induce grounding occurs. The present invention has been made on the basis of the above circumstances, and has as its object to prevent rotation caused by contact between coil sides inserted into a slot and grounding caused by contact between a coil side and a slot wall surface. An object of the present invention is to provide an armature of an electric machine.

[0006]

[Means for Solving the Problems]

By providing a concave relief at the bottom corner of the slot, it is possible to prevent the inside corner of the lower coil side inserted into the slot from interfering with the wall surface of the slot. As a result, an excessively large load can be prevented from being locally applied to the wall surface of the slot, thereby preventing a problem that the lower coil side breaks the lower layer insulator and grounds. Further, in the present invention, by providing the relief portion at the bottom corner of the slot, the corner R of the mold forming the slot can be enlarged, so that stress concentration on the corner is reduced and the life of the mold can be improved. Further, by dividing and manufacturing a punch for punching a slot, if a corner of the punch is damaged, only the corner can be replaced, so that wear and damage of the punch can be dealt with at low cost.

According to a second aspect of the present invention, in the armature of the rotary electric machine according to the first aspect, the relief portion is provided over two surfaces of the slot side surface and the slot bottom surface forming the bottom corner of the slot. . In this case, even if the lower coil side is biased in the slot due to misalignment when assembling the lower coil conductor to the armature core or caulking unbalance when caulking the claw, the lower coil side Can be prevented from interfering with the inner peripheral side corners and the slot wall surface, thereby preventing the occurrence of grounding.

(Claim 3) A concave relief portion is provided at a substantially central portion in the radial direction of the circumferential side surface of the slot, so that an outer peripheral corner of the lower coil side and an inner peripheral corner of the upper coil side are provided. Can be prevented from interfering with the side surface of the slot. As a result, an excessively large load can be locally prevented from being applied to the side surface of the slot, so that the lower-layer coil insulator and the upper-layer slot insulator do not break the lower-layer coil insulator and the upper-layer slot insulator. The occurrence of grounding on the coil side can be prevented. In addition, it is possible to prevent occurrence of rare between the lower coil side and the upper coil side.

(4) The slot in which the upper side where the upper layer coil side is inserted has a larger circumferential slot width than the lower side where the lower layer coil side is inserted, and
The step width between the lower side and the upper side is set smaller than the thickness of the lower slot insulator. In this case,
Even if the stepped portion of the lower-layer slot insulator is damaged, if the lower-layer slot insulator remains in the slot, the upper-layer slot insulator prevents the upper-layer coil side from interfering with the stepped portion of the slot. And the occurrence of grounding can be prevented. At this time, even in the worst case, even if the stepped portion of the lower slot insulator is inserted into the slot in a damaged state, the upper slot insulator of the same thickness as the lower slot insulator protects the upper coil side, There is no interference between the stepped portion of the slot and the corner of the upper layer coil side, and the occurrence of grounding can be prevented.

According to a fifth aspect of the present invention, in the armature of the rotary electric machine according to the fourth aspect, a recessed relief portion is provided on a circumferential side surface of the slot so as to straddle a step between the lower stage and the upper stage. I have. In this case, since the stepped corner portion is eliminated by providing the relief portion, there is an advantage that the stress concentration on the corner portion of the mold forming the slot is reduced and the life of the mold can be greatly improved.

(Embodiment 6) In the state where the caulking claw is tilted to the slot side and caulked, an escape portion is provided inside the caulking claw to escape from the outer peripheral corner of the upper coil side. In this case, even if the caulking load at the time of caulking the caulking claw is unbalanced, the corner on the outer peripheral side of the upper coil side does not interfere with the caulking claw. This allows
Since the corners of the upper coil side and the corners of the lower coil side are not locally pressed against the slot wall surface, each slot insulator is not broken, and the occurrence of grounding on each coil side can be prevented. .

(Claim 7) In the armature of a rotary electric machine according to claim 6, a concave portion is provided on the inner side surface of the caulking claw, and when the caulking claw is turned down to the slot side and caulked, the concave portion is formed. An escape portion is formed. In this case, since the connecting portion between the outer peripheral surface of the armature core and the caulking claw can be formed large, the life of the mold can be improved, and the punch can be divided and manufactured, so that it is possible to cope with the wear and breakage of the punch at low cost. .

(Means of Claim 8) In the armature of a rotating electric machine according to claim 6, when the swaging pawl is swung down to the slot side and swaged, a swaging portion is formed inside. In this case, as described in claim 6, there is no need to provide a concave portion in the caulking claw in advance, and the same mold as that of the related art can be used, so that the cost for manufacturing a new mold is unnecessary.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an armature of a rotating electric machine according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the inside of the slot. The armature 1 of the present embodiment is used for, for example, a starter motor, and includes a rotating shaft 2, an armature core 3, an armature coil (described later), and the like, as shown in FIG. The armature core 3 is formed by laminating a plurality of disc-shaped core sheets, and is fitted to the outer periphery of the rotating shaft 2 so as to be rotatable integrally with the rotating shaft 2. A predetermined number (for example, 25) of slots 4 (see FIG. 5) are respectively provided in the outer peripheral portion of the armature core 3 along the axial direction.
Are provided at equal pitches in the circumferential direction of the armature core 3.
As shown in FIG. 5, a pair of caulking claws 5 are provided on both sides of the opening of the slot 4 on the outer peripheral surface of the armature core 3.

The armature coil comprises lower coil conductors 6 and upper coil conductors 7 as many as the number of slots 4 respectively. The lower coil conductor 6 and the upper coil conductor 7 are made of a material such as pure copper or pure aluminum having a low electric resistance.
Each is shaped into a predetermined shape extending below. As shown in FIG. 6, the lower coil conductor 6 includes a linear coil side 6A having a rectangular cross section, and a set of coil ends 6B extending from both ends of the coil side 6A at a substantially right angle to the coil side 6A.
A set of coil protrusions 6C extending substantially perpendicularly from the tip of each coil end 6B to the opposite side to the coil side 6A, and the set of coil ends 6B are at predetermined angles in opposite directions about the coil side 6A. It is provided inclined (twisted). In the lower coil conductor 6, the coil side 6A is inserted into the slot 4 together with the lower slot insulating paper 8, and both coil ends 6B are respectively disposed on the outer side of the end face of the armature core 3 in a disk-shaped insulator 9 (see FIGS. 4 and 5). ) Is arranged through.

The overall shape of the upper coil conductor 7 is shown in FIG.
Are shaped into substantially the same shape as the lower coil conductor 6 shown in FIG. More specifically, a linear coil side 7A having a rectangular cross section and having a total length slightly longer than the lower coil side 6A, and a pair of coil ends extending substantially perpendicularly to the coil side 7A from both ends of the coil side 7A. 7B and a set of coil protrusions 7C extending from the tip of each coil end 7B at a right angle to the opposite side to the coil side 7A, and the set of coil ends 7B are in opposite directions about the coil side 7A. Are inclined at a predetermined angle (in a twisted state). This upper coil conductor 7
The coil side 7A is inserted together with the upper-layer slot insulating paper 10 outside the lower-layer coil side 6A in the slot 4, and both coil ends 7B are respectively disposed outside the lower-layer coil end 6B in a disc-shaped insulator 11 (FIG. 4 and FIG. 4). (See FIG. 5).

The lower-layer slot insulating paper 8 has a lower-layer coil side 6A and an armature core 3 (wall surface of the slot 4) in the slot 4.
And is formed in a U-shaped cross section corresponding to the inner surface shape of the slot 4. As shown in FIG. 7, the lower slot insulating paper 8 is previously combined with the lower coil side 6A before being inserted into the slot 4, and is inserted into the slot 4 together with the lower coil side 6A from the radial outside of the armature core 3. Is inserted into. The upper slot insulating paper 10 insulates between the upper coil side 7A, the lower coil side 6A and the armature core 3 (the wall surface of the slot 4) in the slot 4, and has a cross section similar to that of the lower slot insulating paper 8. It is shaped like a letter. After inserting the lower layer coil side 6A together with the lower layer slot insulating paper 8 into the slot 4, the upper layer slot insulating paper 10 is combined with the upper layer coil side 7A and together with the upper layer coil side 7A from the radial outside of the armature core 3. It is inserted into the slot 4. The lower slot insulating paper 8
The upper coil is formed by crimping the caulking claw 5 together with the upper slot insulating paper 10 inserted inside the lower slot insulating paper 8 so that both side end portions protrude outward from the entrance of the slot 4. It is folded so as to enclose the side 7A.

(First Embodiment) In this embodiment, as shown in FIG. 1, both lower corners 6A
Relief portion 12 for avoiding interference with the inner peripheral corner 6a
Is provided. The relief portion 12 is formed, for example, concavely in an arc-shaped cross section, and is provided over the entire length of the slot 4 in the longitudinal direction (axial direction). Since the relief portions 12 are provided at both corners of the inner bottom portion of the slot 4 in this manner, variations in the shape of the slot 4, dimensions of the lower coil conductor 6, the lower slot insulating paper 8, etc., processing variations, etc. occur, and the lower coil Even if the side 6A is twisted or twisted in the slot 4, the inner peripheral corner 6a of the lower coil side 6A breaks the lower slot insulating paper 8 and the wall surface of the slot 4 (the slot bottom surface 4a and the slot bottom surface). It does not directly interfere with the side surface 4b), and it is possible to avoid the local overload. Thereby, grounding due to contact between the lower coil side 6A and the wall surface of the slot can be prevented.

The escape portions 12 provided at both corners of the inner bottom of the slot 4 allow the inner peripheral corner 6 of the lower coil side 6A to be formed.
Since a can be prevented from interfering with the wall surface of the slot 4, it is not necessary to completely remove burrs generated in the process of manufacturing the lower coil conductor 6. As a result, the deburring step can be simplified or eliminated, so that the manufacture of the lower coil conductor 6 can be simplified. Further, in this embodiment, the slot 4
Since the relief portion 12 is provided at the bottom corner of the mold, the corner R of the mold (not shown) forming the slot 4 can be increased, so that stress concentration on the corner is reduced and the life of the mold can be improved. Further, by dividing and manufacturing the punch for punching out the slot 4, when the corner of the punch is damaged, only the corner can be replaced, so that wear and damage of the punch can be dealt with at low cost.

In this embodiment, as shown in FIG. 2, the distance Wn1 from one slot side 4b in the circumferential direction (left side in FIG. 2) to the position of the slot bottom surface 4a of the other relief portion 12 in the circumferential direction.
Is preferably smaller than the circumferential dimension Wc1 of the lower coil side 6A. In this case, interference between the inner corner 6a of the lower coil side 6A and the slot bottom surface 4a can be completely avoided. Also, as shown in FIG. 3, if the distance Wn2 from the outer peripheral end surface of the lower coil side 6A to the position of the slot side surface 4b of the relief portion 12 is smaller than the radial dimension Wc2 of the lower coil side 6A, the lower coil side 6A The interference between the inner peripheral corner 6a and the slot side surface 4b can be completely avoided. Therefore, the relief portion 12 is provided over the slot bottom surface 4a and the slot side surface 4b so as to satisfy the conditions shown in FIGS. 2 and 3 so that the inner peripheral corner 6a of the lower coil side 6A and the slot Since the interference with the wall surface of the slot 4 can be completely avoided, the contact between the lower coil side 6A and the wall surface of the slot can be reliably prevented to prevent grounding.

In this embodiment, the upper coil side 7A is inserted into the lower slot insulating paper 8 together with the upper slot insulating paper 10, and the upper coil side 7A is inserted into both the lower slot insulating paper 8 and the upper slot insulating paper 10. As shown in FIG. 7, after bending the end of the lower-layer slot insulating paper 8 so as to wrap the lower-layer coil side 6A, as shown in FIG. And the end of the upper slot insulating paper 10 may be bent so as to surround the upper coil side 7A. Also in this case, the escape portions 12 are provided at both corners of the inner bottom of the slot 4 as in the first embodiment, thereby preventing contact between the lower coil side 6A and the slot wall surface and earthing can be prevented.

FIG. 8 is a sectional view of the inside of the slot 4. In this embodiment, as shown in FIG. 8, a relief portion 13 is provided at a substantially central portion in the radial direction of the slot side surface 4b.
In this case, even if the shape of the slot 4, the dimensional variation or the processing variation of the lower coil conductor 6 and the lower slot insulating paper 8 and the like occur, the lower coil side 6A is twisted or twisted in the slot 4. In addition, the outer peripheral corner 6b of the lower coil side 6A does not break the lower slot insulating paper 8 and directly interfere with the slot side surface 4b, so that an excessive load can be prevented from being locally applied. Thereby, lower layer coil side 6A
Contact between the upper coil side 6A and the upper coil side 7A can be prevented from being rare. Further, as described in the first embodiment, it is not necessary to completely remove burrs generated in the process of manufacturing the lower coil conductor 6, and it is necessary to completely remove burrs generated in the process of manufacturing the upper coil conductor 7. And the lower coil conductor 6
Further, the manufacture of the upper coil conductor 7 can be simplified.

Further, in the second embodiment, as shown in FIG. 9, the circumferential dimension Wn4 of the relief portion 13 (slot side surface 4b
(The depth of the relief portion 13) from the width Ws of the slot 4
By increasing the circumferential dimension Wc of each coil side 6A, 7A from the above, interference between the outer peripheral corner 6b of the lower coil side 6A and the slot side surface 4b and the inner peripheral angle of the upper coil side 7A are made larger. Since the interference between the portion 7a and the side surface 4b of the slot can be completely avoided, the contact between each of the coil sides 6A, 7A and the side surface 4b of the slot can be surely prevented to prevent grounding. Further, as shown in FIG. 10, the radial dimension Wn3 of the relief portion 13 is made larger than the sum of the thickness Wt1 of the lower slot insulating paper 8 and the thickness Wt2 of the upper slot insulating paper 10, so that the lower coil side Interference between the outer peripheral corner 6b of the upper coil side 7A and the inner peripheral corner 7a of the upper coil side 7A and the slot side 4b can be completely avoided. Grounding can be prevented by preventing contact with the slot side surface 4b.

In this embodiment, the upper coil side 7A is inserted into the lower slot insulating paper 8 together with the upper slot insulating paper 10 together with the upper slot insulating paper 10, so that both the lower slot insulating paper 8 and the upper slot insulating paper 10 have the upper coil side 7A. As shown in FIG. 11, after bending the end portion of the lower slot insulating paper 8 so as to wrap the lower coil side 6A, as shown in FIG. And the end of the upper slot insulating paper 10 may be bent so as to surround the upper coil side 7A. Also in this case, by providing the escape portion 13 on the slot side surface 4b as in the second embodiment, it is possible to prevent contact between the lower coil side 6A and the upper layer coil side 7A and the slot wall surface, thereby preventing grounding.

(Third Embodiment) FIG. 12 is a sectional view of the inside of the slot 4. In this embodiment, as shown in FIG. 12, when the caulking claw 5 is tilted down to the slot 4 side and fixed by caulking, the caulking claw 5 does not interfere with the outer peripheral corner 7b of the upper coil side 7A. An escape portion 14 is provided inside the base of the nail 5. As a result, variations in the shape of the slot 4 and in dimensions and processing of the lower coil conductor 6 and the lower slot insulating paper 8 and the like occur, so that the lower coil side 6A is twisted or twisted in the slot 4. The interference between the outer corner 7b of the upper coil side 7A and the side surface 4b of the slot and the outer corner 7b of the upper coil side 7A and the claw 5 do not directly interfere. For this reason, it is possible to avoid an excessive load being locally applied by caulking and fixing the caulking claw 5, so that the upper coil side 7A and the armature core 3
To prevent grounding.

In the case of the present embodiment, as shown in FIG. 13, a relief recess 5a may be provided inside the base of the caulking claw 5 in advance. In this case, by making the depth Ws1 of the concave portion 5a larger than the thickness Wt2 of the upper slot insulating paper 10, interference between the outer peripheral corner 7b of the upper coil side 7A and the caulking claw 5 can be prevented. The contact between the coil side 7A and the caulking claw 5 can be prevented to prevent grounding. Further, by providing the relief concave portion 5a inside the root portion of the caulking claw 5, the caulking claw 5 can be caulked with a lower load than when there is no concave portion 5a. There is an advantage that the slot teeth 15 can be prevented from buckling from the root.

In this embodiment, the upper coil side 7A is inserted into the lower slot insulating paper 8 together with the upper slot insulating paper 10, and the upper coil side 7A is inserted into both the lower slot insulating paper 8 and the upper slot insulating paper 10. 14 and 15, the end portion of the lower-layer slot insulating paper 8 is bent so as to wrap the lower-layer coil side 6A, and the upper-layer coil side 7A is formed outside the lower-layer slot insulating paper 8 as shown in FIGS. A configuration may be adopted in which the end portion of the upper-layer slot insulating paper 10 is inserted into the slot 4 together with the insulating paper 10 and the end of the upper-layer slot insulating paper 10 is wrapped around the upper coil side 7A. Also in this case, similarly to the third embodiment, when the caulking claw 5 is tilted down to the slot 4 side and fixed by caulking, the caulking claw 5 does not interfere with the outer corner 7b of the upper coil side 7A so as to be caulked. By providing the escape portion 14 on the inner side of the root portion of the nail 5, contact between the upper coil side 7 </ b> A and the armature core 3 can be prevented, and grounding can be prevented.

(Fourth Embodiment) FIGS. 16 and 17 are sectional views of the inside of the slot 4. FIG. This embodiment shows an example of a stepped slot 4 as shown in FIG. 16 or a modified stepped slot 4 as shown in FIG. The stepped slot 4 shown in FIG. 16 has a circumferential slot width greater on the upper side where the upper coil side 7A is inserted than on the lower side where the lower layer coil side 6A is inserted. FIG.
Is formed so that the slot side surface 4b on the lower side is inclined and the slot width gradually decreases toward the bottom.

In such a stepped slot 4 or modified stepped slot 4, the dimension of the bottom slot insulating paper 8 in the circumferential direction at the bottom is smaller than that in the case where the slot width is the same (the first to third embodiments). Therefore, it becomes easy to insert the lower coil side 6A into the slot 4 together with the lower slot insulating paper 8. That is, it can be easily inserted into the slot 4 without interfering with the entrance corner of the slot 4. This allows
Since the lower slot insulating paper 8 is not damaged, the shape of the slot 4, the lower coil conductor 6 and the lower slot insulating paper 8
If the lower coil side 6A is twisted or twisted in the slot 4 due to dimensional variation or processing variation of the lower coil side 6A, the corners 6a and 6b of the lower coil side 6A It does not break and directly interfere with the slot wall. Therefore, the lower coil side 6 is also affected by the imbalance of the caulking load generated when the caulking claw 5 is caulked.
There is no direct interference between A and the slot wall surface, and grounding can be prevented.

In the case of the stepped slot 4 shown in FIG. 16, the stepped width Ws2 of the lower and upper sides is made smaller than the thickness Wt1 of the lower slot insulating paper 8 so that the lower coil side 6A is formed inside the slot 4. Even if the lower-layer slot insulating paper 8 is damaged when it is inserted into the slot 4, if the lower-layer slot insulating paper 8 remains in the slot 4, the thickness Wt1 of the lower-layer slot insulating paper 8 is larger than the step width Ws2, so that the upper coil side 7A The occurrence of grounding can be prevented without interfering with the stepped corner of the slot 4. At this time, in the worst case, even if the lower slot insulating paper 8 is inserted into the slot 4 with the stepped portion damaged, the upper slot insulating paper 10 having the same thickness as the lower slot insulating paper 8 protects the upper coil side 7A. Therefore, the stepped corner of the slot 4 does not interfere with the inner peripheral corner 7a of the upper coil side 7A, and the occurrence of grounding can be prevented.

Further, in the case of the present embodiment, as described in the first embodiment, relief portions for avoiding interference with the inner peripheral corner 6a of the lower coil side 6A are provided at both corners of the inner bottom of the slot 4. 12 may be provided. Thereby, the same effect as in the first embodiment can be obtained. Alternatively, as described in the second embodiment, the relief portion 1 is provided at a substantially central portion in the radial direction of the slot side surface 4b.
3 may be provided. In this case, as shown in FIGS. 18 and 19, the relief portion 13 is provided on the slot side surface 4b, so that the stepped portion of the slot side surface 4b shown in FIGS. 16 and 17 is eliminated. When inserted into the slot 4 together with the slot insulating paper 8, the inner peripheral corner 6 a of the lower coil side 6 A does not interfere with the slot side face 4 b and can be easily inserted. Damage can be further reduced.

When the relief portion 13 is provided on the slot side surface 4b, the radial dimension Wn3 of the relief portion 13 is determined by the thickness Wt1 of the lower slot insulating paper 8 and the thickness Wt1 of the upper slot insulating paper 10 as in the second embodiment. By making the dimension larger than the sum of the thickness Wt2 and the outer peripheral corner 6b of the lower coil side 6A and the slot side 4b, and the inner peripheral corner 7a of the upper coil side 7A and the slot side 4b. Can be completely avoided, so that the contact between each coil side 6A, 7A and the slot side surface 4b can be reliably prevented to prevent grounding.
Further, as described in the third embodiment, when the caulking claw 5 is tilted down to the slot 4 side and fixed by caulking, the caulking claw 5
A relief portion 14 may be provided inside the root portion of the caulking claw 5 so that the upper portion does not interfere with the outer peripheral corner 7b of the upper coil side 7A. Thereby, the outer peripheral corner 7b of the upper coil side 7A
Since the caulking claw 5 does not directly interfere with the caulking claw 5, it is possible to prevent an excessive load from being locally applied due to the caulking fixation of the caulking claw 5, thereby preventing the upper coil side 7 </ b> A from contacting the armature core 3. To prevent grounding.

[Brief description of the drawings]

FIG. 1 is a sectional view of the inside of a slot (first embodiment).

FIG. 2 is a sectional view of the inside of a slot (first embodiment).

FIG. 3 is a sectional view of the inside of a slot (first embodiment).

FIG. 4 is a half sectional view of an armature.

FIG. 5 is an exploded perspective view of the armature.

6A is a side view of the lower coil conductor 6, FIG. 6B is a view A of FIG. 6A, and FIG. 6C is a view B of FIG.

FIG. 7 is a cross-sectional view of the inside of a slot (a modification of the first embodiment).

FIG. 8 is a sectional view of the inside of a slot (second embodiment).

FIG. 9 is a sectional view of the inside of a slot (second embodiment).

FIG. 10 is a sectional view of the inside of a slot (second embodiment).

FIG. 11 is a sectional view of the inside of a slot (a modification of the second embodiment).

FIG. 12 is a sectional view of the inside of a slot (third embodiment).

FIG. 13 is a sectional view of the inside of a slot (third embodiment).

FIG. 14 is a sectional view of the inside of a slot (a modification of the third embodiment).

FIG. 15 is a sectional view of the inside of a slot (a modification of the third embodiment).

FIG. 16 is a sectional view of the inside of a slot (fourth embodiment).

FIG. 17 is a sectional view of the inside of a slot (fourth embodiment).

FIG. 18 is a sectional view of the inside of a slot (a modification of the fourth embodiment).

FIG. 19 is a sectional view of the inside of a slot (a modification of the fourth embodiment).

FIG. 20 is a sectional view showing a process of inserting a lower coil side into a slot together with a lower slot insulating paper (prior art).

FIG. 21 is a cross-sectional view showing a process of inserting a lower coil side into a slot together with a lower slot insulating paper (prior art).

FIG. 22 is a cross-sectional view of the inside of a slot (prior art).

FIG. 23 is a cross-sectional view showing a state where slot teeth are buckled (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Armature 3 Armature core 4 Slot 4a Slot bottom face 4b Slot side face (circumferential side face) 5 Caulking claw 5a Depression 6 Lower coil conductor 6A Lower coil side 7 Upper coil conductor 7A Upper coil side 8 Lower slot insulating paper (Lower slot Insulator) 10 Upper-layer slot insulating paper (Upper-layer slot insulator) 12 Relief section (first embodiment) 13 Relief section (Second embodiment) 14 Relief section

Claims (8)

[Claims] A lower coil having an armature core having a plurality of slots on the outer periphery and a lower coil side having a rectangular cross section, wherein the lower coil side is inserted into the slot via a lower slot insulator. A rotating electric machine comprising: a conductor; and an upper-layer coil conductor having an upper-layer coil side having a rectangular cross-section, the upper-layer coil side being inserted outside the lower-layer coil side in the slot via an upper-layer slot insulator. The armature of a rotary electric machine according to any one of claims 1 to 3, wherein a concave relief portion is provided at a bottom corner of the slot. 2. The armature of a rotating electric machine according to claim 1, wherein said relief portion is provided on two sides of a slot side surface and a slot bottom surface forming a bottom corner of said slot. And the armature of the rotating electric machine. 3. An lower armature having an armature core having a plurality of slots on the outer periphery and a lower coil side having a rectangular cross section, wherein the lower coil side is inserted into the slot via a lower slot insulator. A rotating electric machine comprising: a conductor; and an upper-layer coil conductor having an upper-layer coil side having a rectangular cross-section, the upper-layer coil side being inserted outside the lower-layer coil side in the slot via an upper-layer slot insulator. An armature for a rotary electric machine, wherein a recessed relief portion is provided at a substantially central portion in a radial direction of a circumferential side surface of the slot. 4. An lower armature having an armature core having a plurality of slots on its outer periphery, and a lower coil side having a rectangular cross section, wherein the lower coil side is inserted into the slot via a lower slot insulator. A rotating electric machine comprising: a conductor; and an upper-layer coil conductor having an upper-layer coil side having a rectangular cross-section, the upper-layer coil side being inserted outside the lower-layer coil side in the slot via an upper-layer slot insulator. In the armature, the slot is formed such that the upper-stage side where the upper-layer coil side is inserted has a larger circumferential slot width than the lower-stage side where the lower-layer coil side is inserted, and the lower-stage side and the upper-stage side Wherein the step width of the armature is set to be smaller than the thickness of the lower slot insulator. 5. The armature of a rotary electric machine according to claim 4, wherein a recessed relief portion is provided on a circumferential side surface of the slot so as to straddle a step between the lower stage and the upper stage. An armature of a rotating electric machine. 6. An armature core having a plurality of slots on its outer periphery, a pair of caulking claws on both sides of an opening of the slot, and a lower coil side having a square cross section. A side has a lower coil conductor inserted into the slot via a lower slot insulator, and an upper coil side having a square cross section, and the upper coil side has the upper coil side in the slot via an upper slot insulator. An upper-layer coil conductor inserted outside the lower-layer coil side, wherein the lower-layer coil side is inserted into the slot together with the lower-layer slot insulator, and then the upper-layer coil side is inserted into the slot together with the upper-layer slot insulator. After being inserted into the armature of the rotating electric machine fixed by swaging the pair of swaging claws toward the slot side, tilting the swaging claw toward the slot side. An armature for a rotating electric machine, wherein a relief portion is provided inside the caulking claw in a swaged state to escape from a corner on the outer peripheral side of the upper coil side. 7. The armature of a rotary electric machine according to claim 6, wherein a concave portion is provided on an inner surface of the caulking claw, and the caulking claw is tilted toward the slot side to caulk the claw. An armature for a rotating electric machine, wherein a relief portion is formed. 8. The rotating electric machine according to claim 6, wherein the caulking claw forms the relief portion inside when the caulking claw is swung to the slot side and swaged. Armature.