TW201434237A - Rotary machine - Google Patents

Abstract

An objective of this invention is for solving a problem that exists all along in the stator of conventional rotary electric machines such as electric motors and generators, the problem being such that the tooth width of a stator in the central portion having a recess is annularly shortened, causing more adverse effects of cogging torque and torque ripple, and the lowering of efficiency of rotary machine. The rotary machine of this invention has an opening that makes the width of a tooth 1 narrowed which is at a specific position in the radial direction of a stator core 2 on both side surfaces of the tooth 1, the opening extends in the axial direction of the stator core 2, and is formed with a recess 1a of at least one place, wherein the recess 1a is formed in different locations on both sides of the tooth 1.

Description

Rotary motor

The present invention relates to a stator configuration of a rotating electrical machine.

A stator of a conventional rotating electric machine such as a motor or a generator is formed by inserting a stator core formed by laminating a plurality of steel sheets into a winding. For example, when the core of the rotating electrical machine is a cylindrical stator core, teeth are formed on the inner circumferential surface of the stator core so as to extend in parallel along the radius of the stator core and in the axial direction of the stator core. Further, between the teeth adjacent to the circumferential direction of the stator core, a slot extending obliquely along the radius of the stator core and having a certain opening width from the open end to the deep portion thereof is formed. Moreover, the stator has a plurality of overlapping winding coils that incorporate a plurality of slots.

The tooth system is formed such that the cross-sectional shape perpendicular to the central axis of the stator core tapers from the bottom end (the inner circumferential surface of the stator core) toward the end. In the tooth, the side surface of the adjacent two teeth forming the groove is such that the width of the opening in the radial center portion of the stator core of the tooth is increased, and the width of the tooth is recessed in the circumferential direction, and the stator is spread over the stator. The recess is formed in such a manner that the core extends integrally in the axial direction.

The plurality of overlapping winding coils incorporated in the plurality of slots are inserted into a pair of two slots in a plurality of slots of the stator core, and the overlapping coils are wound around the teeth by distributed winding. In addition, two overlapping winding coils are inserted in one slot. Overlapping winding line The loop system is composed of a plurality of windings after the entire row, and a rectangular line having a rectangular cross section is used as the winding. Further, the overlap winding coil is formed in advance in a ring shape having a pair of insertion portions that are inserted into the grooves and a pair of coil terminals that are exposed outward from the grooves. At this time, the overlapping stitches are wound by flat wise bending (see, for example, Patent Document 1).

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2012-39742 (page 13, FIG. 3)

Since the stator of the conventional rotating electric machine such as a motor or a generator has the above configuration, the recessed portion formed on the side surface portion of the full tooth is present in the same position in the circumferential direction of the stator core, so that the tooth width will be The specific radial position of the stator core becomes annularly shortened, with the result that the magnetic saturation acting on the front end portion of the tooth increases. As a result, there is a problem that the influence of the cogging torque and the torque ripple is increased to lower the efficiency of the rotary electric machine.

In addition, in the stator of a conventional rotating electric machine such as a motor or a generator, a coil composed of a rectangular wire wound with an insulating paper is inserted from a slot opening to form a stator. However, when the insulating paper is previously wound and inserted into the winder, the insulating paper and the winding are separated to cause a vacant space in the groove. As a result, there is a problem that the reduction in the area ratio of the winding with respect to the groove area is caused, and the efficiency of the rotary electric machine is lowered.

The present invention has been made in order to solve the above problems, and an object thereof is to provide a rotating electrical machine having a stator which is disposed relative to each tooth The side portions are recessed portions arranged in the radial direction of the stator core, whereby the portions where the tooth width is narrowed are dispersed and suppressed, and the influence of the magnetic saturation on the tip end portion of the teeth is further reduced.

The rotary electric machine according to the present invention has a stator in which a plurality of teeth are arranged in a ring-shaped stator core, and a coil is provided in the toothed coil via an insulating member, and a plurality of grooves are formed in the groove existing between the teeth. a layer coil in which a specific position in the radial direction of the stator core on both sides of the tooth has an opening that narrows the width of the tooth, the opening extending along the axial direction of the stator core, and at least formed A recess of a portion, and the recess is formed at different positions on both sides of the tooth.

In the present invention, the concave side portions of the stator cores are disposed in the radial direction of the stator core, and the magnetic flux acting on the tip end portions of the teeth is relaxed, and the efficiency of the rotary electric machine can be improved.

1, 31, 101, 201‧‧ ‧ teeth

1a‧‧‧ concave part of the tooth

1b, 31b‧‧‧ side of the tooth

1c, 31c‧‧‧ front end of the tooth

1d, 31d‧‧‧ the right side of the nth tooth

1e, 31e‧‧‧ left side of the (n-1)th tooth

2, 32, 102, 202‧ ‧ stator core

3, 33, 103, 203 ‧ ‧ slots

3a, 33a‧‧‧ slot insertion

3b, 33b‧‧‧ the lower part of the stator core side of the groove

10, 310‧‧‧ Stator

12, 312‧‧‧Under insulating paper

12a, 312a‧‧‧ front end of the lower insulation paper

13, 313‧‧‧Upper insulation paper

13a, 313a‧‧‧The lower part of the upper insulation paper

13b, 313b‧‧‧ front end of the upper insulation paper

13c, 313c‧‧‧ upper part of the upper insulation paper

14, 314‧‧‧ middle layer insulation paper

20a, 20b, 20c, 320a, 320b, 320c‧‧‧ distributed winding

31f‧‧‧Departure

Fig. 1 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the first embodiment of the present invention.

Fig. 2 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the first embodiment of the present invention.

Fig. 3 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the first embodiment of the present invention.

Fig. 4 is a view showing the shape of a stator according to a first embodiment of the present invention.

Fig. 5 is a cross-sectional view showing a tooth shape in which the positions of the concave portions on the tooth flanks are different in the first embodiment of the present invention.

Fig. 6 is a cross-sectional view showing the tooth shape in which the concave portion of the tooth flanks is provided at three locations in the first embodiment of the present invention.

Figure 7 is a cross-sectional view showing the separation of the teeth from the stator core in the first embodiment of the present invention.

Fig. 8 is a cross-sectional view showing the state in which the insulating paper is placed at the position of the concave portion of the flank surface in the end portion of the lower insulating paper according to the first embodiment of the present invention.

Fig. 9 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the second embodiment of the present invention.

Fig. 10 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the second embodiment of the present invention.

Fig. 11 is an explanatory view showing the order in which the insulating paper and the winding are attached to the groove shown in the second embodiment of the present invention.

Fig. 12 is a cross-sectional view showing the shape of a tooth having different positions of the step portions on the tooth flanks according to the second embodiment of the present invention.

Fig. 13 is a cross-sectional view showing the tooth shape in which the step portion of the tooth flanks is provided at three locations in the second embodiment of the present invention.

Fig. 14 is a cross-sectional view showing the second embodiment of the present invention in which the teeth are separated from the stator core.

Fig. 15 is a cross-sectional view showing the state in which the insulating paper of the lower insulating paper is bent and inserted into the groove in the second embodiment of the present invention.

(First embodiment)

Fig. 1 through Fig. 3 are explanatory views showing the order in which the insulating paper and the winding are mounted in the groove shown in the first embodiment of the present invention. Figure 4 is a first embodiment of the present invention The shape diagram of the stator shown. In the first to fourth figures, 1 is a tooth portion, 1a is a concave portion formed in the tooth 1, 1b is a side surface of the tooth 1, 1c is a front end portion of the tooth 1, and 1d is a right side surface of the nth tooth 1, 1e is the left side of the (n-1)th tooth 1. 2 is a stator core, 3 is a groove, 3a is a groove insertion portion, 3b is a lower layer portion on the stator core 2 side of the groove 3, and 10 is a stator. 12 is a lower insulating paper, 12a is a front end portion of the lower insulating paper 12, 13 is an upper insulating paper, 13a is a lower layer portion of the upper insulating paper 13, 13b is a front end portion of the upper insulating paper 13, and 13c is an upper layer of the upper insulating paper 13. In the portion, 20a is a lower layer distributed around the coil, and 20b is an upper layer distributed around the coil.

In the first to fourth figures, the stator 10 has an annular stator core 2, and on the inner circumferential surface of the stator core 2, the teeth 1 arranged in a plurality of rows in the circumferential direction are oriented in the axial direction of the stator core 2. Formed in a parallel extension. The stator core 2 constituting the stator 10 is formed by laminating a plurality of steel sheets for the purpose of reducing the eddy current loss. Further, in the stator 10, a groove 3 extending in the radial direction of the stator core 2 is formed between the teeth 1 adjacent to the circumferential direction of the stator core 2. The groove 3 is opened from the lower layer portion 3b on the stator core 2 side toward the groove insertion portion 3a, and the teeth 1 are integrally coupled to the stator core 2. Further, the stator 10 has a plurality of distributed winding coils 20a, 20b incorporated in a plurality of slots 3.

As shown in Fig. 1, the tooth 1 is formed such that the cross-sectional shape perpendicular to the central axis of the stator core 2 is gradually tapered from the bottom end of the inner circumferential surface of the stator core 2. In the teeth 1, on both side faces of the teeth 1 on the adjacent sides of the groove 3, the recess 1a is formed such that a part of the opening width is widened at a specific position in the radial direction of the stator core 2 of the tooth 1, and even the teeth The width of the circumferential direction of 1 is concave, and is formed to extend along the axial direction of the stator core 2. The concave portion 1a is provided on the right side surface 1d and the first side of the adjacent nth tooth 1 which form the mth (m≧1, m=1, 3, 5, ...) groove 3 from the reference groove. N-1) the relative position of the left side 1e of the teeth 1 Set. Here, the width of the concave portion 1a in the radial direction is set to be the thickness of the insulating papers 12, 13. In addition, when it is the case of the m-1th (m≧2, m=2, 4, ...) groove 3 calculated from the groove as the reference, it is adjacent to the adjacent m-th groove 3 A recess 1a that is displaced in the radial direction of the stator core 2 is provided at a position where the positions of the recesses 1a on the side faces of the teeth 1 on the both sides are different. Further, the teeth 1 on the adjacent sides forming the groove 3 are formed in a line symmetrical shape with respect to the radial center line of the stator core 2 of the groove 3.

The reason why the concave portion 1a is provided is that the lower insulating paper 12 and the upper insulating paper 13 are present in the same groove 3, thereby preventing the decrease in the area ratio of the coils 20a and 20b with respect to the distribution of the groove area, and increasing the winding. The insulation distance of the line. In addition, the reason why the position of the recessed portion 1a is different for each adjacent groove 3 is to reduce the backlash effect torque and torque ripple of the rotating electrical machine. When the concave portion 1a is disposed at the same position on the side surface of the full tooth 1, as a whole, the tooth 1 will result in a portion where the tooth width becomes narrow with respect to the specific radial position of the stator core 2, and the front end portion of the tooth 1 is generated. Since the magnetic properties of 1c are saturated, the concave portion 1a is provided by the same position of the right side surface 1d of the adjacent nth tooth 1 forming the groove 3 and the left side surface 1e of the (n-1)th tooth 1 . This can alleviate magnetic saturation and increase the efficiency of the rotating machine.

In the first embodiment of the present invention, the distributed coils 20a and 20b are wound around the teeth 1 by overlapping winding. Further, in each of the grooves 3, the distribution coils 20a and 20b are divided into two layers of the upper layer and the lower layer and inserted. Further, the distributed coils 20a and 20b are inserted from the slot insertion portion 3a toward the lower layer portion 3b on the stator core 2 side, and the end portions of the distributed coils 20a and 20b are disposed until the slot insertion portion 3a.

Next, the mounting procedure of the two layers in which the distribution coils 20a and 20b are stacked on the upper layer and the lower layer in each of the grooves 3 will be described. As shown in FIGS. 2 and 3, the lower insulating paper 12 is formed by bending one rectangular insulating paper while inserting the stator of the slot 3. The lower portion 3b on the side of the core 2. The lower insulating paper 12 covers the lower layer portion 3b on the stator core 2 side of the groove 3 and the side surface 1b of the tooth 1, and is bent from the both corner portions of the lower layer portion 3b on the stator core 2 side of the groove 3, and the lower insulating paper 12 is 2 The front end portions 12a are inserted into the respective concave portions 1a.

Next, the lower insulating paper 12 is inserted into the lower layer portion of the groove 3, and the front end portion 12a of the lower insulating paper 12 is fixed to the two concave portions 1a provided on the side surface 1b of the tooth 1, and then starts from the inside of the lower insulating paper 12. The lower layer is distributed around the coil 20a. When the winding is inserted, the end of the lower layer distributed around the coil 20a is attached to the tooth 1 so as to be filled from the concave portion 1a provided on the side surface 1b of the tooth 1 to the concave portion 1a of the side surface 1b forming the other side of the groove 3. .

After the winding of the coil 20a in the lower layer is completed, the upper insulating paper 13 belonging to the rectangular insulating paper is inserted into the groove insertion portion 3a while being bent from the lower layer around the coil 20a. The lower layer portion 13a of the upper insulating paper 13 is disposed on the upper surface of the coil 20a under the lower surface of the concave portion 1a provided on the side surface 1b of the tooth 1. The one end portion 13b of the upper insulating paper 13 is disposed from the front end portion 1c of the tooth 1 on the side of the groove insertion portion 3a in the radial direction of the stator core 2 to a thickness portion of the upper insulating paper 13. Thereafter, the upper layer is wound around the coil 20b from the lower layer portion 13a of the upper insulating paper 13 in the direction of the groove insertion portion 3a. At this time, the upper layer is wound around the end of the front end portion 13b of the upper insulating paper 13 around the end of the coil 20b. After the winding of the upper layer distributed coil 20b is completed, the upper layer portion 13c of the upper insulating paper 13 is bent so as to cover the upper layer distributed around the coil 20b, and is disposed in contact with the front end portion 13b of the upper insulating finger 13.

As described above, by providing the concave portion 1a in the radial direction of the stator core 2 with respect to the side surface 1b of the tooth 1, the insulating paper can be fixed in such a manner as to be in close contact with the side surface 1b of the tooth 1. 12, 13. As a result, the area ratio of the windings relative to the groove area can be increased, and the efficiency of the rotating electrical machine can be improved.

Further, the concave portion 1a is provided on the right side surface 1d and the first n-th tooth 1 which form the mth (m≧1, m=1, 3, 5, ...) groove 3 from the groove as the reference (n-1) The opposite positions of the left side faces 1e of the teeth 1 are opposite. When it is the case of the m-1th (m≧2, m=2, 4, ...) groove 3 from the groove as the reference, it is on the adjacent sides provided on the mth groove 3 The recessed portion 1a which is displaced in the radial direction of the stator core 2 is provided at a position where the positions of the recesses 1a provided on the side faces of the teeth 1 are different. As a result, the magnetic saturation acting on the tip end portion 1c of the tooth 1 can be alleviated, and the backlash effect torque and torque ripple of the rotary electric machine can be reduced.

Further, by providing the concave portion 1a in the radial direction of the stator core 2 with respect to the side surface 1b of the tooth 1, the front end portion 12a of the lower insulating paper 12 can be fixed, and the movement of the insulating paper in the groove 3 can be restricted.

Further, with respect to the insulating papers 12 and 13 inserted into the grooves 3, the lower insulating paper 12 is inserted in parallel with the side surface 1b of the teeth 1, and the front end portion 12a is bent and disposed inside the concave portion 1a. Further, the upper insulating paper 13 is disposed so as to be superposed on the lower layer distributed coil 20a, and is folded so as to cover the coil 20b so as to cover the upper layer. As a result, the number of insulating paper layers in the groove 3 from the groove insertion portion 3a to the lower layer portion 3b is a three-layer structure from the conventional four-layer structure, so that the number of layers of the insulating paper due to the overlap of the insulating paper can be reduced. As a result, the occupancy area ratio with respect to the groove area can be increased, and the efficiency of the rotary electric machine can be improved.

Further, in the first embodiment of the present invention, the concave portion 1a is provided on the right side surface 1d of the adjacent nth tooth 1 forming the groove 3 and the left side surface 1e of the (n-1)th tooth 1 The same position, but can also be changed to the right side of the nth tooth 1 The position of the concave portion 1a of 1d is different from the position of the concave portion 1a of the left side surface 1e of the (n-1)th tooth 1 . For example, as shown in Fig. 5, the concave portion 1a of the right side surface 1d of the nth tooth 1 is placed near the center of the tooth 1, and the position of the concave portion 1a of the left side surface 1e of the (n-1)th tooth 1 is placed. The position of the concave portion 1a which is smaller than the right side surface 1d of the nth tooth 1 is closer to the groove insertion portion 3a side. In the mounting sequence, the lower insulating paper 12 is inserted into the groove 3, and the front end portion 12a of the lower insulating paper 12 is fixed in the concave portion 1a on both side faces of the tooth 1. After the lower insulating paper 12 is fixed, the lower layer is wound around the coil 20a from the inside of the lower insulating paper 12. Thereafter, the upper insulating paper 13 is inserted from the lower layer around the coil 20a, and the upper layer is wound around the coil 20b. After the winding is completed, the upper insulating paper 13 is bent in the inner side direction of the groove 3 so that the upper layer portion 13c of the upper insulating paper 13 covers the upper layer around the coil 20b. By adopting this shape, the tooth flanks 1b can be made narrow in the wide range of the specific radial position of the stator core 2 without narrowing the tooth width, and the magnetic saturation acting on the tip end portion 1c of the tooth 1 can be alleviated.

Further, in the first embodiment of the present invention, the right side surface 1d of the adjacent nth tooth 1 and the left side surface 1e of the (n-1)th tooth 1 in the groove 3 are respectively provided at one place. The concave portion 1a has a structure in which the groove 3 composed of two layers is formed. However, as shown in Fig. 6, the portion where the concave portion 1a is provided may be changed to two places on each side of the tooth 1, or three places may be provided. Alternatively, a larger number of recesses 1a may be provided. The mounting order of the stator 10 in these cases is the same as that of the first embodiment of the present invention. First, the insulating paper 12 is inserted into the lower portion of the groove 3 and fixed to the concave portion 1a of the flank, and then the winding is inserted. . The same work is performed on each floor. Further, in Fig. 6, 14 is a middle insulating paper, and 20c is a middle layer distributed winding.

Further, although the first embodiment of the present invention has been described using a distributed winding coil, a wave wound coil may be used.

Further, in the first embodiment of the present invention, the cross-sectional shape of the tooth 1 is formed to be tapered from the bottom end of the inner peripheral surface of the stator core 2 toward the tip end, but may be a tooth width from the bottom end to the front end. For a certain tooth shape.

Further, in the first embodiment of the present invention, the stator structure in which the stator core 2 and the teeth 1 are integrally connected is described as a target for the winding, but the stator shown in FIG. 7 may be used. The split structure of the core 102 and the teeth 101 is separated. In this case, after the teeth 101 are pressed into the radial direction of the stator core 102 and inserted, the distribution is wound around the coils into the grooves 103 formed between the teeth 101.

Further, in the first embodiment of the present invention, the distal end portion 12a of the lower insulating paper 12 inserted into the groove 3 is bent toward the inside of the concave portion 1a, but it may be configured as shown in Fig. 8. In order to prevent the front end portion 12a of the lower insulating paper 12 from being inserted into the inside of the concave portion 1a, the distal end portion 12a is disposed in the vicinity of the concave portion 1a, and the distal end portion 12a is along the side surface of the tooth 1.

(Second embodiment)

Fig. 9 through Fig. 11 are explanatory views sequentially showing the procedure of mounting the insulating paper and the winding in the groove in the second embodiment of the present invention. Fig. 12 is a cross-sectional view showing a tooth shape in which the positions of the step portions on the tooth flanks are different according to the second embodiment of the present invention. In Figs. 9 to 12, 31 is a tooth, 31b is a side surface of the tooth 31, 31c is a front end portion of the tooth 31, 31d is a right side surface of the nth tooth 31, and 31e is the (n-1)th tooth. On the left side of 31, 31f is a step. 32 is a stator core, 33 is a groove, 33a is a groove insertion portion, 33b is a lower layer portion on the stator core 32 side of the groove 33, and 310 is a stator. 312 is the lower insulating paper, 312a is the front end portion of the lower insulating paper 312, 313 is the upper insulating paper, 313a is the lower layer of the upper insulating paper 313, 313b is the front end portion of the upper insulating paper 313, and 313c is the upper layer of the upper insulating paper 313. Department, 320a is the lower layer distributed around the coil, 320b is the upper layer The cloth is wound around the coil.

In the ninth to eleventh drawings, the stator 310 has an annular stator core 32, and on the inner circumferential surface of the stator core 32, the teeth 31 arranged in a plurality of rows in the circumferential direction are parallel to the stator core 32. Formed in an axially extending manner. The stator core 32 constituting the stator 310 is formed by laminating a plurality of steel sheets for the reason of reducing the eddy current loss. Further, in the stator 310, a groove 33 extending in the radial direction of the stator core 32 is formed between the teeth 31 adjacent to the circumferential direction of the stator core 32. The groove 33 is opened from the lower layer portion 33b on the stator core 32 side toward the groove insertion portion 33a, and the teeth 31 are integrally coupled to the stator core 32. Further, the stator 310 has a plurality of distributed winding coils 320a, 320b incorporated in a plurality of grooves 33.

As shown in Fig. 9, the teeth 31 are formed such that their cross-sectional shapes are tapered from the bottom end of the inner circumferential surface of the stator core 32 toward the front end. In the teeth 31, on both side faces of the teeth 31 on the adjacent sides of the groove 33, the step portion 31f is such that the tooth width is discontinuously changed along the radial direction of the stator core 32 with respect to both side faces of the tooth 31. The way is formed. The step portion 31f is provided on the right side surface 31d of the adjacent nth tooth 31 which forms the mth (m≧1, m=1, 3, 5, ...) groove 33 from the reference groove 33. The opposite positions of the left side faces 31e of the (n-1)th teeth 31 are opposite. In addition, when it is the case of the m-1th (m≧2, m=2, 4, ...) groove 33 from the groove as the reference, it is adjacent to the mth groove 33, respectively. A position difference portion 31f that is shifted in the radial direction of the stator core 32 is provided at a position where the positions of the step portions 31f on the side faces of the teeth 31 on both sides are different. Further, the teeth 31 on the adjacent sides forming the groove 33 are formed in a line symmetrical shape with respect to the radial center line of the stator core 32 of the groove 33.

The reason why the step portion 31f is provided is that the lower insulating paper 312 and the upper insulating paper 313 are present in the same groove 33, so that the area with respect to the groove can be prevented. The distributed area ratio of the coils 320a, 320b is reduced, and the insulation distance of the winding is increased. In addition, the reason why the position of the step portion 31f is different for each adjacent groove 33 is to reduce the backlash effect torque and torque ripple of the rotating electrical machine. When the step portion 31f is disposed at the same position on the side surface of the full tooth 31, the portion of the tooth 31 as a whole with respect to the specific radial position of the stator core 32 is generated, and the front end portion of the tooth 31 is generated. Since the magnetic property of 31c is saturated, the step portion 31f is provided by the same position only at the same position as the right side surface 31d of the adjacent nth tooth 31 of the groove 33 and the left side surface 31e of the (n-1)th tooth 31. This can alleviate magnetic saturation and increase the efficiency of the rotating machine.

In the second embodiment of the present invention, the distributed winding coils 320a and 320b are wound around the teeth 31 by overlapping winding. Further, in each of the grooves 33, the distribution winding coils 320a and 320b are divided into two layers of the upper layer and the lower layer and inserted. Further, the distributed coils 320a and 320b are inserted from the slot insertion portion 33a toward the lower layer portion 33b on the stator core 32 side, and the end portions of the distributed coils 320a and 320b are disposed until the slot insertion portion 33a.

Next, a procedure for mounting the two layers in which the distribution coils 320a and 320b are stacked on the upper layer and the lower layer in each of the grooves 33 will be described. As shown in FIGS. 10 and 11, the lower insulating paper 312 is formed by bending one rectangular insulating paper and inserting it into the lower portion 33b on the side of the stator core 32 of the groove 33. The lower insulating paper 312 covers the lower layer portion 33b on the stator core 32 side of the groove 33 and the side surface 31b of the tooth 31, and is bent from the both corner portions of the lower layer portion 33b on the stator core 32 side of the groove 33, and the lower insulating paper 312 2 The front end portions 312a are inserted so as to extend to the step portion 31f. Further, since the order of mounting the upper layer portion on the side of the groove insertion portion 33a is the same as that of the first embodiment, only the winding order of the lower layer portion will be described here.

As described above, the stator core 32 is on the side 31b of the tooth 31. The stepped portion 31f is provided in the radial direction, and the insulating papers 312 and 313 can be fixed to the side surface 31b of the tooth 31. As a result, the occupied area ratio of the winding relative to the groove area can be increased, and the efficiency of the rotating electrical machine can be improved.

Further, the step portion 31f is provided on the right side surface 31d of the adjacent nth tooth 31 which forms the mth (m≧1, m=1, 3, 5, ...) groove 33 from the reference groove. (n-1) The opposite positions of the left side faces 31e of the teeth 31 are opposite. When the m-1th (m≧2, m=2, 4, ...) groove 33 is calculated from the groove as the reference, it is disposed on the adjacent sides of the mth groove 33, respectively. A step portion 31f that is shifted in the radial direction of the stator core 32 is provided at a position where the positions of the step portions 31f on the side faces of the teeth 31 are different. As a result, the magnetic saturation acting on the tip end portion 31c of the tooth 31 can be alleviated, and the backlash effect torque and torque ripple of the rotary electric machine can be reduced.

Further, by providing the step portion 31f in the radial direction of the stator core 32 with respect to the side surface 31b of the tooth 31, the front end portion 312a of the lower layer insulating paper 312 can be fixed, and the movement of the insulating paper in the groove 33 can be restricted.

Further, with respect to the insulating papers 312 and 313 inserted into the grooves 33, the lower insulating paper 312 is inserted into the step portion 31f in parallel with the side surface 31b of the teeth 31 in the radial direction of the stator core 32, and the upper insulating paper 313 is superposed and arranged in the lower layer. It is wound around the coil 320a and is bent to cover the coil 320b so as to cover the upper layer. As a result, the number of insulating paper layers in the groove 33 from the groove insertion portion 33a to the lower layer portion 33b is a three-layer structure from the conventional four-layer structure, so that the number of layers of the insulating paper due to the overlap of the insulating paper can be reduced. As a result, the occupancy area ratio with respect to the groove area can be increased, and the efficiency of the rotary electric machine can be improved.

Further, in the second embodiment of the present invention, the step portion 31f is provided on the right side surface 31d and the (n-1)th tooth 31 from the nth tooth 31 forming the groove 33. The configuration of the same position on the left side surface 31e may be changed to the position of the step portion 31f of the right side surface 31d of the nth tooth 31 and the step portion 31f of the left side surface 31e of the (n-1)th tooth 31. The location is relatively different. For example, as shown in Fig. 12, the step portion 31f of the right side surface 31d of the nth tooth 31 is provided near the center of the tooth 31, and the step portion 31f of the left side surface 31e of the (n-1)th tooth 31 is The position is disposed closer to the groove insertion portion 33a than the position of the step portion 31f of the right side surface 31d of the nth tooth 31. In the mounting sequence, the lower insulating paper 312 is inserted into the groove 33, and the front end portion 312a of the lower insulating paper 312 is fixed along the step portion 31f on both side faces of the tooth 31. After the lower insulating paper 312 is fixed, the lower layer is wound around the coil 320a from the inside of the lower insulating paper 312. Thereafter, the upper insulating paper 313 is inserted from above the lower layer distributed coil 320a, and the upper layer is wound around the coil 320b. After the winding is completed, the upper insulating sheet 313 is bent in the inner side direction of the groove 33 so that the upper layer portion 313c of the upper insulating paper 313 covers the upper layer around the coil 320b. By forming this shape, the tooth width can be narrowed in a wide range at a specific radial position of the stator core 32 with respect to the radial direction of the stator core 32 of the tooth side surface 31b, and the front end portion 31c acting on the tooth 31 can be alleviated. Magnetic saturation.

Further, in the second embodiment of the present invention, the right side surface 31d of the adjacent nth tooth 31 of the groove 33 and the left side surface 31e of the (n-1)th tooth 31 are respectively provided with a step at each position. The portion 31f is formed as a groove 33 composed of two layers. However, as shown in Fig. 13, the position where the step portion 31f is provided may be changed to two on each side surface of the tooth 31, or may be set. It is also possible to have a plurality of step portions 31f at three places. The mounting order of the stator 10 in these cases is the same as that of the second embodiment of the present invention, in which the insulating paper 312 is first inserted into the lower portion of the groove 33 and fixed to the step portion 31f of the tooth flanks, and then the winding is inserted. form. The same work is performed on each floor. Further, in Fig. 13, 314 is a middle insulating paper, and 320c is a middle layer distributed winding.

Further, in the second embodiment of the present invention, the stator structure of the stator core 32 and the teeth 31 is integrated, and the winding is described. However, the stator may be a stator as shown in FIG. The two-part structure in which the core 202 is separated from the teeth 201. In this case, after the teeth 201 are pressed into the radial direction of the stator core 202 and inserted, the distribution is wound around the coil into the groove 203 formed between the teeth 201.

Further, in the second embodiment of the present invention, the front end portion 312a of the lower insulating paper 312 inserted into the groove 33 is disposed parallel to the step portion 31f of the flank surface, but as shown in Fig. 15, The front end portion 312a of the lower insulating paper 312 is bent and arranged along the step portion 31f.

1‧‧‧ teeth

1a‧‧‧ concave part of the tooth

1b‧‧‧ side of the tooth

1c‧‧‧ front end of the tooth

1d‧‧‧the right side of the nth tooth

1e‧‧‧left side of the (n-1)th tooth

2‧‧‧STAR core

3‧‧‧ slots

3a‧‧‧Slot insertion

3b‧‧‧The lower part of the stator core side of the groove

Claims (11)

A rotating electrical machine having a stator having a plurality of teeth arranged in a ring-shaped stator core, and a coil is disposed on the toothed coil via an insulating member, and a groove is formed in the groove existing between the teeth a plurality of layers of the coil, wherein the rotating machine has an opening that narrows a width of the tooth at a specific position in a radial direction of the stator core on both sides of the tooth, the opening extending along an axial direction of the stator core And forming a recess having at least one portion, and the recess is formed at a position where the two sides of the tooth are different. The rotary electric machine according to claim 1, wherein the recessed portion is formed in the concave portion of the teeth on the adjacent sides of the groove, and the concave portion is formed equidistant from the stator core in a radial direction. The rotary electric machine according to claim 2, wherein the teeth on the adjacent sides forming the groove form a line symmetrical shape with respect to a radial center line of the stator core of the groove. The rotary electric machine according to any one of claims 1 to 3, wherein an end portion of the insulating member is disposed in the vicinity of the concave portion, and an end portion of the insulating member is along a side surface of the tooth It does not bend toward the inside of the aforementioned recess. The rotary electric machine according to any one of claims 1 to 3, wherein the radial length of the stator core of the recess is the same as the thickness of the insulating member. The rotary electric machine according to claim 5, wherein an end portion of the insulating member is bent and disposed inside the concave portion. A rotating electrical machine having a stator having a plurality of teeth arranged in a ring-shaped stator core, and a coil is disposed on the toothed coil via an insulating member, and a groove is formed in the groove existing between the teeth a plurality of layers of the coil, wherein the rotating machine has a stepped portion in which a width of the tooth is narrowed at a specific position in a radial direction of the stator core on both sides of the tooth, the step being along an axis of the stator core The step extends, and a step portion of at least one portion is formed, and the step portion is formed at a different position on both side surfaces of the tooth. The rotary electric machine according to claim 7, wherein the stepped portions of the teeth formed on adjacent sides of the groove are formed equidistant from the stator core in a radial direction. The rotary electric machine according to claim 8, wherein the teeth on the adjacent sides of the groove are formed in a line symmetrical shape with respect to a radial center line of the stator core of the groove. The rotary electric machine according to any one of claims 7 to 9, wherein an end portion of the insulating member is disposed in the vicinity of the step portion, and an end portion of the member is along a side surface of the tooth It will not bend at the aforementioned step. The rotary electric machine according to any one of claims 7 to 9, wherein the end portion of the insulating member is bent and disposed along the step portion.