JP2004064827A - Stator for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the processing of the sidewall of a main body tooth and the projection of a mounting tooth in case that the teeth provided separately at the periphery of the yoke of a stator core consist each of the main body tooth and the mounting tooth. <P>SOLUTION: The stator core 20 consists of a circular yoke 22 and a plurality of teeth 24 for demarcating a plurality of slots 33. Each tooth 24 consists of the main body tooth 25 which includes a pair of sidewalls 27 and a recess 30, and the mounting tooth 40 which includes a base 41 for retaining a stator coil 34 and a projection 45 to be inserted into the recess 30. A gap 50 is made between the bottom 30a of the recess 30 and the tip 45a of the projection 45. As a result, the processing of the sidewall 27 and the projection 45 becomes easy, and also at engagement of the projection 45 with the recess 30, the gap 50 serves as an escape part for transformation of the projection 45. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator of a rotating electric machine, and more particularly to an improvement of a stator core thereof.
[0002]
[Prior art]
One type of rotating electric machine is a generator (alternator). The alternator includes a stator fixed to a frame and a rotating rotor. The stator includes a stator core and a stator coil, and the stator core has an annular yoke, a number of teeth (teeth), and a number of slots. The teeth protrude radially inward from the inner peripheral surface of the yoke and guide magnetic flux from the rotor. The slots are defined by adjacent teeth, in which the stator coils are housed.
[0003]
The stator coil is wound around the slot sequentially from the opening side. The width of the opening of the slot is preferably wider from the viewpoint of facilitating winding of the stator coil. However, from the viewpoint of the formation of the magnetic circuit, the narrower the better, the narrower the advantage is that the gogging torque is reduced. It is difficult to satisfy these two contradictory requirements with known projection-like teeth.
[0004]
In view of this, the applicant of the present application has previously described in Japanese Patent Application Laid-Open No. 2000-50540 (hereinafter referred to as "conventional example") an assembling-type fixing of a rotating electric machine in which teeth are formed by two parts, namely a main body tooth part and a mounting tooth part. Apply for child core.
[0005]
In this conventional example, as shown in FIG. 4, the stator core 70 includes a yoke 72, teeth (teeth) 74 and a slot 79, and the teeth 74 have a base tooth 75 and a separate tooth 80. The base teeth 75 include a pair of side walls 76 formed on the inner peripheral surface of the yoke 72 and a recess 77 between the side walls 76. On the other hand, the separate tooth portion 80 includes a base portion 81 and a convex portion (shaft portion) 82 protruding from the base portion 81. The width of the intermediate portion in the height direction of the convex portion 82, that is, the width C of the intermediate portion in the depth direction of the concave portion 77 is larger than the width in the circumferential direction of the convex portion 82, that is, the width B of the concave portion 77. , Ie, the width A of the bottom surface of the concave portion 77 is smaller than the circumferential width of the front end of the concave portion 77.
[0006]
According to this conventional example, the stator coil (not shown) is stored in the wide slot 79 before the separate tooth portion 80 is attached to the base tooth portion 75, so that the winding is easy. Then, the stator coil wound around the slot 79 is prevented from falling out of the slot 79 by the protruding portion 81a of the base portion 81 of the separate tooth portion 80. Further, since the width A is smaller than the width B, the insertion of the projection 82 into the recess 77 is facilitated. In addition, since the width C is larger than the width B, it is possible to prevent the inserted convex portion 82 from rattling in the concave portion 77 or coming out of the concave portion 77.
[0007]
[Problems to be solved by the invention]
In the above conventional example, the tolerance between the distal end surface 82a of the convex portion 82 of the separate tooth portion 80 and the bottom surface 77a of the concave portion 77 of the base tooth portion 75, and the distal end surface 76a of the side wall portion 76 and the facing surface 81b of the base portion 81 The tolerances between were both zero. Specifically, the height of the side wall 76 and the height of the projection 82 are equal. With this, with the separate tooth portion 80 attached to the base tooth portion 75, the front end surface 82a of the convex portion 82 is brought into contact with the bottom surface 77a of the concave portion 77, and the front end surface 76a of the side wall portion 76 is opposed to the facing surface 81b of the base portion 81. Trying to abut.
[0008]
However, in order to make both of the two tolerances zero, precise finishing must be performed on the side wall portion 76 of the base tooth portion 75 and the convex portion 82 of the base tooth portion 80, which increases the processing cost.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stator of a rotating electric machine in which machining of two parts or members forming teeth is facilitated and machining cost is low.
[0010]
[Means for Solving the Problems]
The inventor of the present application has considered providing a gap between two parts or members constituting the teeth. However, this gap is likely to cause difficulty in mounting one part or the like to the other part or the like, or cause unstable posture after mounting. Then, the present invention was completed by conceiving the position, shape and size of the gap which is unlikely to cause such a problem.
[0011]
According to a first aspect of the present invention, there is provided a rotating electric machine stator, wherein an annular yoke and a plurality of slots are formed on a peripheral surface of the yoke in a circumferential direction so as to form a magnetic flux passage. And a stator core having a plurality of teeth defining the stator coil, and a stator coil housed in each slot. Here, each tooth protrudes toward the rotor and includes a pair of side walls and a body tooth portion including a concave portion defined by both side walls that are separated in the circumferential direction, and the teeth protrude from the opening of the slot facing the rotor. And a mounting tooth portion having a projection protruding from the base to the side opposite to the rotor and inserted into the recess. Further, a gap is formed between the bottom surface of the concave portion of each main body tooth portion and the tip end surface of the convex portion of the mounting tooth portion.
[0012]
In the stator according to the first aspect, the teeth include the main body teeth formed on the stator core and the mounting teeth separate from the stator core. In this case, the gap can theoretically be provided between the side wall of the main body tooth and the base of the mounting tooth, or between the convex part of the mounting tooth and the recess of the main body tooth. However, considering that the convex portion is easily deformed (extended) in the axial direction by the clamping force (compression force) applied to the convex portion from the side wall portion when the mounting tooth portion is fitted to the main body tooth portion, the tip of the convex portion is considered. A gap was formed between the surface and the bottom of the recess.
[0013]
In this stator, a tolerance is given to the height of the side wall portion of the main body tooth portion and / or the height of the convex portion of the mounting tooth portion, so that the height of the side wall portion and / or the convex portion can be loosely controlled. In addition, when the mounting teeth are fitted to the main body teeth, the gap serves as a relief for deformation of the projection.
[0014]
As described in claim 7, the stator according to the second invention of the present application has a ring-shaped yoke and a plurality of circumferentially spaced circumferential surfaces formed on the yoke to form a magnetic flux path and partition a plurality of slots. The stator core includes teeth and stator coils housed in each slot. Here, the yoke has a holding portion including a pair of side walls protruding toward the rotor and spaced apart in the circumferential direction and a concave portion defined by both side walls. Includes a protruding base and a projection that projects from the base toward the non-rotor side and is inserted into the recess. Further, a gap is formed between the bottom surface of the concave portion of each holding portion and the tip end surface of the convex portion of the tooth.
[0015]
In the stator according to the second aspect, the holding portion is formed on the stator core, and the teeth separate from the stator core are held by the holding portion. Also in this stator, a tolerance is given to the height of the side wall portion of the holding portion of the stator core and / or the height of the convex portion of the teeth, whereby the management of the side wall portion and / or the convex portion can be relaxed. Further, when the teeth are fitted to the holding portions, the gaps serve as escape portions for the deformation of the convex portions.
[0016]
In the first and second aspects of the present invention, the gap between the bottom surface of the concave portion and the tip surface of the convex portion facilitates the processing of the mounting tooth portion or the holding portion and the main body tooth portion or the teeth, and does not cause magnetic resistance as much as possible. The gap is intentionally provided as described above, and should be distinguished from a gap that happens to exist for the convenience of processing and assembly.
[0017]
According to the second or eighth aspect of the present invention, in the first or seventh aspect, the facing surface of the mounting tooth portion or the base portion of the tooth is in contact with the distal end surface of the main body tooth portion or the side wall portion of the holding portion. According to the third or ninth aspect of the present invention, in the second or eighth aspect, the height of the gap is constant over the entire width of the concave portion and the convex portion.
[0018]
According to a fourth or tenth aspect of the present invention, in the second or eighth aspect, the area of the distal end surface of the convex portion is larger than the area of the distal end surface of the side wall portions. In the stator according to claim 5 or 11, in claim 2 or 8, the width of the concave portion gradually increases as the depth increases, reaches a maximum near the center, and then gradually decreases, and the width of the convex portion increases as the height increases. It gradually increases, reaches a maximum near the center, and gradually decreases thereafter.
[0019]
According to a sixth or twelfth aspect of the present invention, in the second or eighth aspect, the width of the base of the side wall portion is from １ ／ to の of the width of the recess, and the height of the gap is from 1/100 of the width of the recess. 1/10.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
<Rotating electric machine>
The rotating electric machine includes a motor, a generator and a motor / generator. Among them, for example, a synchronous motor flows an alternating current through a coil of a stator to form a rotating magnetic field, and attracts or repels a rotor as a fixed magnetic pole to rotate. Further, for example, a three-phase AC generator generates electric power in a coil of a stator by rotating magnetic flux of a rotor.
[0021]
Note that the motor / generator has both functions of a motor and a generator, and functions as a generator when the charge amount of the battery is small, charges the generated power to the power source, and when the engine driving power is insufficient. It functions as a motor and assists the driving force of the engine.
<Stator>
The stator includes a stator core and a stator coil. The stator core includes an annular yoke and a plurality of teeth circumferentially spaced on an inner or outer peripheral surface thereof. In the first invention, each tooth includes a main body tooth formed on the stator core and a mounting tooth separate from the stator core. On the other hand, in the second aspect, the holding portion is formed on the stator core, and the teeth separate from the stator core are held by the holding portion.
[0022]
In both the first invention and the second invention, a stator coil is housed in a slot defined by adjacent teeth and wound around using the teeth. For example, in the case of a three-phase AC generator, three stator coils are wound.
<Main body teeth, holding part>
The main body tooth portion in the first invention, that is, the holding portion in the second invention, includes a pair of side wall portions and a concave portion formed between both side wall portions. The pair of side walls protrude inward from the inner peripheral surface of the yoke or outward from the outer peripheral surface, are circumferentially spaced, and have a symmetrical shape. The cross-sectional shape is an elongated rectangular shape, and the width may be uniform over the entire height, or may increase gradually toward the root. Further, the temperature may gradually decrease to the vicinity of the center toward the root, and then gradually increase. The thickness (axial dimension of the stator core) is the same as the thickness of the yoke.
[0023]
The distance between the side wall portions, that is, the width of the concave portion is determined by the shape of the inner side surface of the side wall portion, and may be uniform over the entire depth, or may gradually decrease as the depth increases. Alternatively, the temperature may gradually increase to near the center in the depth direction, and then gradually decrease. The depth of the recess is determined by the height of the side wall.
<Mounting teeth, teeth>
The attachment tooth portion in the first invention, that is, the tooth in the second invention, includes a base portion and a protruding portion protruding from the base portion, and can have a T-shaped cross section. The base has a rectangular shape curved outward or inward and faces the rotor, and one side (circumferential side) corresponds to the pitch of the slot, and the other side corresponds to the thickness of the yoke. The base can have a central portion, a pair of opposing portions located on both outer sides thereof and facing the side wall portion, and a projecting portion located on both outer sides and projecting to the opening of the slot.
[0024]
The projection protrudes from the center of the base in a direction opposite to the direction of curvature of the base. The height of the convex portion is lower than the height of the side wall portion, and the width and length correspond to those of the concave portion of the main body tooth portion or the holding portion. Thus, the width may be uniform, but may decrease gradually toward the tip or may increase gradually to near the center and then decrease.
[0025]
When the mounting tooth portion or the tooth is fitted to the main body tooth portion or the holding portion, the opposing surface of the opposing portion of the base portion can abut on the distal end surface of the side wall portion. Therefore, the projecting portions on both outer sides of the facing portion are less likely to be deformed inward in the radial direction, and the length thereof can be shortened.
<Gap>
The gap is formed between the bottom surface of the concave portion of the main body tooth portion or the holding portion and the tip end surface of the mounting tooth portion or the convex portion of the tooth. The bottom surface of the recess may be a flat surface extending in the width direction of the side wall portion, an inclined surface forming a predetermined angle with the width direction of the side wall portion, a concave conical surface, or a part of a spherical surface. On the other hand, the tip surface of the projection may be a flat surface extending in the width direction of the projection, an inclined surface forming a predetermined angle with the width direction, a conical surface, or a part of a spherical surface. Various shapes of gaps are defined by the combination of the bottom surface of each shape of the concave portion and the tip surface of each shape of the convex portion.
[0026]
For example, when both the bottom surface of the concave portion and the tip surface of the convex portion are flat surfaces, the height of the gap is uniform over the entire width of the concave portion and the convex portion. In order to form such a gap, a plus tolerance may be provided for the height of the side wall portion and / or a minus tolerance may be provided for the height of the convex portion. If a tolerance is provided for the side wall portion and the convex portion, both processes are facilitated.
[0027]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this embodiment, the rotating electric machine is a three-phase AC generator, and the teeth are composed of main body teeth and mounting teeth.
<Example>
(Constitution)
In FIG. 1, the generator includes a rotor 10, a stator 20, and the like. The rotor 10 includes a shaft (not shown) rotatably supported by a frame (not shown), a rotor core 11 attached to the shaft, S-pole and N-pole magnets 13 housed in a space 12 of the rotor core 11, and the like.
[0028]
On the other hand, the stator 20 has a cylindrical shape as a whole, is mounted on the frame, and houses the rotor 10 in its internal space. The stator 20 is roughly divided into a stator core 22 and a stator coil 34.
[0029]
The stator core 22 is formed by laminating a number of thin iron plates, and includes an annular yoke 23 and a number of teeth (teeth) 24 formed on the inner peripheral surface thereof. More specifically, as shown in an enlarged manner in FIG. 2, the teeth 24 include main body teeth 25 and mounting teeth 40, and the main body teeth 25 include a pair of side walls 27 protruding radially inward. The inner side surface of each side wall 27 is composed of an opening-side vertical surface 28a having a gradually decreasing width and a rear-side inclined surface 28b having a gradually increasing width. The outer surface 29 extends parallel to the radius. The height has a negative tolerance.
[0030]
A recess 30 is formed between the pair of side walls 27. The width of the concave portion 30 increases at a constant rate from the inlet side, becomes maximum at the central portion, and decreases at a constant rate at the back side. The bottom surface 30a of the concave portion 30 is formed of a flat surface formed in parallel with the width direction of the side wall portion 27.
[0031]
A slot 33 is defined by the adjacent teeth 24 (more precisely, the side wall 27) and has a rectangular cross section. The width of the slot 33 is wider than the recess 30, and the depth is deeper than the recess 30. A stator coil 34 is housed in the slot 33 and wound around the teeth 24.
[0032]
The base portion 41 of the mounting tooth portion 40 formed by laminating a plurality of thin iron plates has a rectangular plate shape that is curved outward in its entirety, one side of which is substantially equal to the circumferential pitch of the adjacent slot 33, and the other side. Is equal to the thickness of the yoke 23. The base 41 has a central portion 42, a pair of opposing portions 43 on both outer sides thereof, and a projecting portion 44 on both outer sides thereof. A convex portion 45 protrudes from the central portion 42 in a direction opposite to the bending direction of the base portion 41, that is, in a radially outward direction. The opposing surface 43 a of the opposing portion 43 opposes the tip end surface 27 a of the side wall portion 27, and the projecting portion 44 projects over the opening of the slot 33.
[0033]
The width and length of the protrusion 45 correspond to those of the recess 30 of the main body tooth 25. The distal end surface 45a of the convex portion 45 extends in the width direction and is formed of a flat surface parallel to the bottom surface 30a of the concave portion 30. The height has a plus tolerance, and is slightly higher than the height of the side wall 27. As a result, a gap 50 is formed between the distal end surface 45a of the convex portion 45 and the bottom surface 30a of the concave portion 30 in a state where the opposing surface 43a is in contact with the distal end surface 27a of the side wall portion 27.
[0034]
When the stator coil 34 is wound around the stator core 22, the film-shaped insulators 46 are arranged on the bottom surface and both side surfaces of the slot 33 before the mounting teeth 40 are fitted to the main body teeth 25. In this state, the stator coil 34 is housed in the slot 33, and both ends of the insulator 46 are overlapped on the opening side. Next, the convex portion 45 of the mounting tooth portion 40 is fitted into the concave portion 30 of the main body tooth portion 25, and inserted until the opposing surface 43a contacts the distal end surface 27a.
(Effect)
During operation of the three-phase alternator, magnetic flux from the N-pole magnet 13 of the rotor 10 travels through the air gap in the stator core 22 and returns to the S-pole. When the rotor 10 is rotated by an engine or the like, the magnetic flux flowing in the stator core 22 rotates and moves, and the magnetic flux of the rotor 10 is linked by the stator coil 34, and the three-phase electromotive force is applied to the stator coil 34. Occurs.
[0035]
According to this embodiment, the following effects can be obtained. First, the machining of the side walls 27 of the main body teeth 25 and the projections 45 of the mounting teeth 40 constituting the teeth 24 of the stator core 22 is facilitated. That is, the height of the side wall portion 27 is determined using the tip surface 27a as a reference surface, and a plus tolerance is given to the height. Therefore, it is sufficient that the height of the side wall portion 27 is within the range of the plus tolerance, and the machining becomes easier accordingly. On the other hand, the height of the convex portion 45 is determined using the facing surface 43a as a reference surface, and a negative tolerance is given to the height. Therefore, it is sufficient that the height of the projection 45 is also within the range of the minus tolerance, and the machining is facilitated accordingly.
[0036]
Secondly, the fitting of the projection 45 of the mounting tooth 40 to the recess 30 of the main body tooth 25 is facilitated. As described above, when the convex portion 45 is fitted into the concave portion 30, the width of the convex portion 45 tends to decrease due to the squeezing force received from the side wall portion 27 and extend toward the distal end surface 45 a. However, this extension can be released to the gap 50 between the bottom surface 30a of the concave portion 30 and the distal end surface 45a of the convex portion 45. Therefore, the convex portion 45 can be easily and securely fitted to the concave portion 30.
[0037]
Third, rattling of the mounting teeth 40 fitted to the main body teeth 25 is prevented. As described above, when the S pole or the N pole of the magnet 13 of the rotor 10 faces the teeth 24 in the radial direction, the overhang portion 44 tends to be deformed inward in the radial direction. Also, when the S pole or the N pole of the magnet 13 approaches or separates from the teeth 24, the mounting teeth 40 tend to move in the circumferential direction with respect to the main body teeth 25. In the mounting tooth portion 40 fitted in the concave portion 30 of the portion 25, the opposing surfaces 43 a of the two opposing portions 43 of the base portion 41 are in contact with the distal end surfaces 27 a of the two side wall portions 27. That is, the mounting teeth 40 are held by the main body teeth 25 in a three-point support state. In addition, the inner surfaces 28a and 28b of the concave portion 30, that is, the outer surface of the convex portion 45 are tapered. Therefore, the radially inward deformation of the overhang portion 44 and the rattling of the mounting tooth portion 40 in the circumferential direction are prevented. As a result, the amount of overhang of the overhang portion 44, that is, the circumferential length of the base portion 41 can be reduced.
<Modification>
Hereinafter, a modified example of the gap between the bottom surface of the concave portion 30 and the distal end surface of the convex portion 45 will be described. Here, in any of the modified examples, the shape of the distal end face of the convex portion in the above embodiment is modified.
{Circle around (1)} First Modification As shown in FIG. 3A, in the first modification, the distal end surface 55a of the convex portion 55 is formed of an inclined surface that forms an acute angle slightly smaller than a right angle with respect to the longitudinal direction thereof. A gap 57 is formed between the recess 30 and the bottom surface 30a. The height of the gap 57 is large at one end in the width direction of the concave portion 30 and is small at the other end.
{Circle around (2)} Second Modification As shown in FIG. 3 (b), in the second modification, the distal end surface 60a of the convex portion 60 is formed of a conical surface whose central portion protrudes downward. A gap 62 is formed between them. The height of the gap 62 is small at the center of the protrusion 60 and is large at the periphery.
{Circle around (3)} Third Modification As shown in FIG. 3C, in the third modification, the distal end surface 65a of the convex portion 65 is formed of a circular arc surface whose central portion protrudes downward. A gap 67 is formed between them. The height of the gap 62 is small at the center of the protrusion 65 and is large at the periphery.
[0038]
【The invention's effect】
As described above, according to the first aspect of the present invention, a gap is provided between the bottom surface of the concave portion of the main body tooth portion and the tip end surface of the convex portion of the mounting tooth portion. Therefore, the height of the side wall and the height of the projection can be loosely controlled, and the processing cost can be reduced. In addition, when the mounting tooth portion is fitted to the main body tooth portion, the gap serves as a relief portion of the deformable convex portion, and the insertion of the mounting tooth portion becomes easy. Furthermore, since the opposing surface of the base portion is in contact with the distal end surface of the side wall portion, fluttering of the projecting portion and rattling of the mounting teeth are prevented.
[0039]
On the other hand, according to the stator of the rotary electric machine of the second aspect of the present invention, since a gap is provided between the bottom surface of the concave portion of the holding portion and the tip end surface of the convex portion of the teeth, the side wall portion and the convex portion are formed. Height control can be loosened, and processing costs can be reduced. Further, when the teeth are fitted to the holding portions, the gaps serve as relief portions for the deformed convex portions, and the fitting of the teeth becomes easy.
[0040]
According to the second and eighth aspects of the present invention, there is no gap between the tip surface of the convex portion having a large area and the bottom surface of the concave portion, so that the magnetic resistance does not increase in this portion. According to the stator of the third and ninth aspects, when the mounting tooth portion or the tooth is fitted to the main body tooth portion or the holding portion, deformation is allowed along the entire circumference of the projection.
[0041]
According to the fourth and tenth aspects of the present invention, since the area of the distal end surface of the convex portion is large and the gap is large, large deformation of the convex portion is allowed, and fitting of the mounting tooth portion or the tooth to the main body tooth portion or the holding portion can be performed. It will be easier. According to the stator of the fifth and eleventh aspects, the mounting teeth or the teeth are firmly fitted and held by the main body teeth or the holding parts.
[0042]
According to the stator of the sixth and twelfth aspects, the deformation of the projection is allowed without increasing the width and height of the teeth, and the fitting of the mounting teeth or the teeth to the main body teeth or the holding part is facilitated. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a stator core of a rotating electric machine according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIGS. 3A, 3B, and 3C are cross-sectional views of main parts showing first, second, and third modified examples of a gap, respectively.
FIG. 4 is a cross-sectional view of a main part of a conventional stator core.
[Explanation of symbols]
10: rotor 20: stator 22: stator core 23: yoke 24: teeth 25: body teeth 27: side wall 30: concave portion 30a: bottom surface 40: mounting teeth 45: convex portion 45a: tip surface 50: gap

Claims (12)

A stator core comprising: an annular yoke; and a plurality of teeth circumferentially spaced around a circumferential surface of the yoke to form a magnetic flux path and partition a plurality of slots, each of the teeth facing a rotor. A main body tooth portion including a pair of side walls protruding and circumferentially spaced apart from each other and a concave portion defined by the side wall portions; a base facing the rotor and projecting into an opening of the slot; A stator core including a mounting tooth portion having a protrusion protruding to the side and inserted into the recess,
And a stator coil housed in each of the slots.
A stator for a rotating electrical machine, wherein a gap is formed between a bottom surface of a concave portion of each main body tooth portion and a tip end surface of a convex portion of the mounting tooth portion. The stator according to claim 1, wherein an opposing surface of the base portion is in contact with a front end surface of the side wall portion. The stator according to claim 2, wherein the height of the gap is constant over the entire width of the concave portion and the convex portion. 3. The stator according to claim 2, wherein an area of a front end surface of the convex portion is larger than an area of a front end surface of the both side wall portions. The concave portion gradually increases in width as the depth increases and reaches a maximum near the center and then gradually decreases, and the convex portion gradually increases in width as the height increases and gradually decreases after reaching a maximum near the center. The stator according to claim 2. 3. The stator according to claim 2, wherein a root width of the side wall portion is ４ to の of a width of the recess, and a height of the gap is 1/100 to 1/10 of a width of the recess. 4. . A stator core comprising: an annular yoke; and a plurality of teeth circumferentially spaced on a circumferential surface of the yoke to form a magnetic flux path and define a plurality of slots, the yoke projecting toward the rotor. It has a pair of side walls spaced apart in the circumferential direction and a holding portion including a concave portion defined by the side walls, and the teeth are opposed to the rotor and extend from the base protruding from the opening of the slot. A stator core including a protrusion protruding to the opposite rotor side and inserted into the recess;
And a stator coil housed in each of the slots.
A stator for a rotating electrical machine, wherein a gap is formed between a bottom surface of the concave portion of each of the holding portions and a tip end surface of the convex portion of the tooth. The stator according to claim 7, wherein an opposing surface of the base portion is in contact with a front end surface of the side wall portion. The stator according to claim 8, wherein the height of the gap is constant over the entire width of the concave portion and the convex portion. 9. The stator according to claim 8, wherein an area of a front end surface of the convex portion is larger than an area of a front end surface of the both side wall portions. The concave portion gradually increases in width as the depth increases and reaches a maximum near the center and then gradually decreases, and the convex portion gradually increases in width as the height increases and gradually decreases after reaching a maximum near the center. The stator according to claim 8. 9. The stator according to claim 8, wherein a root width of the side wall portion is 1/4 to 1/2 of a width of the concave portion, and a height of the gap is 1/100 to 1/10 of a width of the concave portion. .

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