JPH08116632A - Stator for rotary electric machine - Google Patents

Abstract

PURPOSE: To provide a stator for rotary electric machine which can minimize the occurrence of magnetic flux leakage and increase of iron loss and, at the same time, can suppress the fluctuation (distortion, etc.) of the inside diameter of the iron core of the magnetic pole section of a rotary electric machine. CONSTITUTION: A stator contains an iron core 71 for magnetic pole section and iron core 72 for yoke section. The core 71 has a laminated structure composed of a plurality of magnetic sheets and the structure is integrally coupled with the front end part 71c of each pole tooth 71b by welding. The core 72 for yoke section has a laminated structure composed of a plurality of magnetic sheets and putting grooves 72a and small grooves 72b formed on the bottoms of the grooves 72a. The pole teeth 71b of the core 71 are put in their corresponding grooves 72a, with the front end sections of the teeth 71b being put in the small grooves 72b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotary electric machine which is assembled by being divided into a magnetic pole core and a yoke core.

[0002]

2. Description of the Related Art Conventionally, as a stator of a rotating electric machine such as an electric motor or a generator, there is a stator composed of a so-called split core in which a magnetic pole core and a yoke core are mutually combined. Japanese Patent Laid-Open No. 26102/1990
The one described in Japanese Patent Publication No. 5 is known.

Next, this conventional stator will be described with reference to FIGS. 5 is a perspective view showing a structure of a magnetic pole portion core of a conventional stator, FIG. 6 is a plan view showing the magnetic pole portion core of FIG. 5, and FIG. 7 is a perspective view showing the stator by fitting the magnetic pole portion core of FIG. It is a perspective view showing composition of a yoke part core which constitutes.

As shown in FIGS. 5 and 6, the magnetic pole portion iron core 111 of the stator is configured to have a predetermined stacking thickness by laminating a plurality of magnetic thin plates (magnetic steel plates), and has a ring shape. A plurality of magnetic pole teeth 109 are formed to extend radially outward from the connecting portion 110. The magnetic pole teeth 109 are arranged at equal intervals in the circumferential direction of the connecting portion 110,
A closed slot 112 is formed between the magnetic pole teeth 109 by the connecting portion 110. The inner peripheral part of the connecting part 110 is
An insertion hole 114 for defining a rotor (not shown) so as to face each other through a predetermined gap is defined.

As shown in FIG. 7, the yoke iron core 106 of the stator is formed by laminating a plurality of ring-shaped magnetic thin plates (magnetic steel plates) 107 having a plurality of cutout grooves formed in the inner peripheral portion thereof. A fitting groove 108 corresponding to each magnetic pole tooth 109 is formed on the inner peripheral portion. Then, the tips of the magnetic pole teeth 109 of the magnetic pole portion iron core 111 corresponding to the respective fitting grooves 108 can be press-fitted and fitted.

In assembling the magnetic pole core 111, first, a magnetic thin plate is stamped and formed into a shape having a plurality of magnetic pole tooth 109 forming projections extending radially outward from the ring-shaped connecting portion 110. The magnetic cores 111 are formed by stacking a plurality of punched magnetic thin plates and integrally joining them by welding or the like in the stacking direction.

Further, like the magnetic pole core 111, a plurality of ring-shaped magnetic thin plates 1 having a plurality of notches formed in the inner peripheral portion thereof.
The yoke core 106 is formed by, for example, laminating 07 and welding each in the laminating direction.

Then, each magnetic pole tooth 10 of the magnetic pole core 111 is formed.
After mounting the stator windings on the magnetic pole teeth 9, the magnetic pole portion core 111 and the yoke portion core 106 are press-fitted so that the tips of the magnetic pole teeth 109 are fitted into the fitting grooves 108 of the corresponding yoke core 106. The stator is assembled by fitting.

[0009]

However, the magnetic pole teeth 109
When welding is performed on a predetermined portion of the magnetic flux, magnetic flux leakage occurs at the welded portion, and iron loss increases.

Further, since the width of the bridging portion between the magnetic pole teeth 109 of the connecting portion 110 is set to be small, the mechanical rigidity of the bridging portion is small, and the magnetic pole core 111 and the yoke core 106 are small. At the time of fitting, the dimensional error between the tip end of each magnetic pole tooth 109 of the magnetic pole core 111 and each fitting groove 108 of the yoke core 106, the tip of each magnetic pole tooth 109, and each yoke core 106 If burrs or the like are generated in the fitting grooves, an excessive force acts on the bridging portion between the magnetic pole teeth 109 of the connecting portion 110, the bridging portion is easily deformed, and high dimensional accuracy is required. This will have an adverse effect on the inside diameter dimension such as distortion.

An object of the present invention is to minimize the occurrence of magnetic flux leakage and increase in iron loss, and to change the inner diameter of the magnetic pole part core when the magnetic pole part core and the yoke part core are fitted together ( (EN) Disclosed is a stator of a rotating electric machine capable of suppressing distortion and the like.

[0012]

According to the first aspect of the present invention,
A magnetic pole portion core formed with a plurality of magnetic pole teeth radially extending outward from a ring-shaped coupling portion through which the rotor is inserted, and the magnetic pole portion iron core are arranged so as to surround the magnetic pole portion core, A stator of a rotating electric machine, comprising: a yoke iron core having a plurality of fitting grooves formed in a peripheral portion thereof; and the magnetic pole teeth being fitted in the corresponding fitting grooves. The magnetic pole portion core is formed by laminating thin plates and welding the tip portions of the magnetic pole teeth of the laminated magnetic thin plates, and the tip surface of the magnetic pole teeth is formed at the bottom of the fitting groove of the yoke core. A groove for accommodating the welded portion protruding outward from is formed.

According to a second aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, the fitting depth between the magnetic pole teeth and the fitting groove is one of the radial width dimension of the yoke core. /
It is characterized in that it is set to 2 or more.

[0014]

In the stator of the rotating electric machine according to the present invention, the magnetic pole iron core is formed by laminating a plurality of magnetic thin plates and welding the tip end portions of the magnetic pole teeth of the laminated magnetic thin plates. The influence of magnetic flux leakage due to the magnetic short circuit at the welded part due to the stacking and fixing of the is minimized, and the increase in iron loss is minimized, and the outer side from the tip surface of the magnetic pole teeth is inserted in the fitting groove of the yoke core. Since a small groove for accommodating the welded part protruding to is formed, the gap between the inner wall of the fitting groove of the yoke core and the fitting part of the magnetic pole teeth is only the small groove part, and The increase in magnetic resistance in the fitting portion with the magnetic pole teeth can be suppressed small.

Further, when the magnetic pole core and the yoke core are fitted together, a dimensional error occurs between each magnetic pole tooth of the magnetic pole core and each fitting groove of the yoke core, the tip of each magnetic pole tooth, and the yoke. When fitting is too tight due to burrs generated in each fitting groove of the core part, the small groove part of the yoke core deforms so as to spread and absorbs the stress, so the inner diameter of the connecting part of the magnetic pole core Dimensional changes (distortion, etc.) are suppressed.

In the stator of a rotating electric machine according to a second aspect of the present invention, the depth of fitting between the magnetic pole teeth and the fitting groove is 1 of the width of the yoke core.
Since it is set to / 2 or more, when the magnetic pole part core and the yoke part core are fitted together, a dimensional error between each magnetic pole tooth of the magnetic pole part core and each fitting groove of the yoke part core, each magnetic pole tooth Even if there is a burr or the like generated in the tip end portion or each fitting groove of the yoke core, the entire yoke part core is reasonably deformed due to the dimensional error, the burrs, etc., and the above-described distortion suppressing effect is further enhanced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the construction of a vehicle wheel motor to which an embodiment of the stator of the present invention is applied, and FIG. 2 is a transverse cross section showing the construction of the stator portion of the vehicle wheel motor of FIG. FIGS. 3A and 3B are schematic views showing a fitted state of the magnetic pole teeth of the magnetic pole portion core of the stator of FIG. 2 and the fitting groove of the yoke portion core.

The vehicle wheel motor 1 of this embodiment is used as a drive source for an industrial vehicle such as a cargo handling vehicle. As shown in FIG. 1, the wheel motor 1 is installed inside a wheel 3 having tires (wheels) 2 mounted thereon. The housing 60 is provided, and the electric motor 4 and the gear reducer 5 are incorporated in the housing 60. The rotation output of the electric motor 4 is transmitted to the wheel 3 via the gear reducer 5, and the wheel 3 is rotationally driven by the transmitted rotational force.

The housing 60 is a substantially bowl-shaped outer case 6
The partition plate 63 is interposed between the inner case 1 and the inner case 62. The inner case 62 and the outer case 61 are fastened with the bolt 10 with the partition plate 63 sandwiched therebetween.
The outer case 61, the inner case 62 and the partition plate 63 are
Cast by aluminum die casting.

A shaft insertion hole 61a is formed in the center of the outer case 61.
A partition wall 61b is formed inside the outer case 61 (inside the housing 60) to form an isolated space S in which the gear reducer 5 is not arranged.

The inner case 62 is fixed to the vehicle body side (not shown) with bolts (not shown).

The electric motor 4 is housed in the inner case 62 and is composed of a closed slot iron core.
70, a rotor (rotor) 8 rotatably provided inside the stator 70, and an output shaft 9 for transmitting the rotation output of the rotor 8 to the wheel 3 via the gear reducer 5. Have.

As shown in FIG. 2, the stator 70 includes a magnetic pole portion core 71 and a yoke portion core 72 arranged so as to surround the magnetic pole portion core 71 outside. The magnetic pole core 71 is
It has a laminated structure in which a plurality of magnetic thin plates are laminated so that the stacking thickness becomes a predetermined value, and a plurality of magnetic pole teeth 71b radially extending outward from the ring-shaped connecting portion 71a are formed. The laminated structure is integrally joined by welding the tip portions of the magnetic pole teeth 71b in the laminating direction. Welded portion 71 of each magnetic pole tooth 71b
c has a convex cross-sectional shape that projects radially outward from the tips of the magnetic pole teeth 71b.

The magnetic pole teeth 71b are arranged at equal intervals in the circumferential direction of the connecting portion 71a. The width dimension in the circumferential direction of the fitting portion of the tip of each magnetic pole tooth 71b with the yoke core 72 is shown in FIG.
As shown in, the width of each magnetic pole tooth 71b is set smaller than the width of the other portion.

A closed slot is formed between the magnetic pole teeth 71b by the connecting portion 71a, as shown in FIG. The radial width dimension of the connecting portion 71a is set to a value sufficiently smaller than the inner diameter dimension of the connecting portion 71a so as to suppress a decrease in efficiency of the electric motor 4 due to an increase in the zico inductance of the stator 70.

A field coil 74 of three phases is wound around each magnetic pole tooth 71b via a coil bobbin 73, and the field coil 7
A rotating magnetic field is generated by 4.

The yoke core 72 is formed by laminating a plurality of ring-shaped magnetic thin plates each having a plurality of notches formed in the inner peripheral portion thereof. Each notch in this inner peripheral portion is shown in FIG.
As shown in FIG. 7, the fitting groove 72a and the semicircular small groove 72b located at the bottom of the fitting groove 72a are formed. The depth dimension of each fitting groove 72a is set to the dimension D.
Defines the fitting depth between the tip of the magnetic pole teeth 71b and the fitting groove 72a, and is set to be 1/2 or more of the radial width W of the yoke core 72. Each fitting groove 72
A tip portion of the magnetic pole tooth 71b of the corresponding magnetic pole portion iron core 71 is fitted in a, and the welding portion 7 protruding outward from the tip surface.
1c is accommodated in the corresponding small groove 72b.

As shown in FIGS. 1 and 2, a ring-shaped pressing plate 30 is abutted on one surface of the yoke portion iron core 72 (the surface on the vehicle side in FIG. 1), and the pressing plate 30 is attached to the yoke portion. It is arranged coaxially with the iron core 72. The retainer plate 30 and the yoke core 72 are fixed to the partition plate 63 with the bolts 13, and the retainer plate 30 allows the fitting grooves 72a and the magnetic pole teeth 71b to be formed.
The fitting part of and is pressed and fixed from the side surface.

As described above, in the stator 7, since the magnetic pole portion core 71 is formed by welding the tip end portions of the magnetic pole teeth 71b formed by laminating a plurality of magnetic thin plates in the laminating direction, the magnetic pole teeth 71b are formed. The influence of magnetic flux leakage due to a magnetic short-circuit state of the welded portion due to the stacking and fixing of the above is small, the increase of iron loss is suppressed to the minimum, and the welded portion of the magnetic pole teeth 71b is formed on the bottom of the fitting groove 72a of the yoke core 72. Since the small groove 72b for accommodating 71c is formed, the yoke core 72
The gap between the inner wall of the fitting groove 72a and the fitting portion of the magnetic pole teeth 71b is limited to this small groove 72b portion only, and the magnetic resistance in the fitting portion of the fitting groove 72a of the yoke core 72 and the magnetic pole teeth 71b is reduced. The increase of is suppressed small.

As shown in FIG. 1, the rotor 8 has a shaft insertion hole (rotation center hole, which is a rotation center hole) over its entire axial length.
The rotor main body 8b is provided with a hollow portion 8a. A plurality of magnetizing magnets 8c arranged at equal intervals in the circumferential direction are mounted on the outer peripheral portion of the rotor body 8b. In this embodiment, the number of magnetizing magnets 8c is set so that the ratio of the number of magnetizing magnets 8c to the number of closed slots is a non-integer multiple.

The axial length of the inner peripheral portion of the rotor main body 8b is longer than the axial length of the outer peripheral portion, and teeth forming the first gear 5a of the gear reducer 5 are formed in that portion. Rotor body 8
An outer peripheral portion of b having a short axial length is rotatably opposed to an inner peripheral portion of the stator 70, and bearings 14a such as ball bearings press-fitted to both ends of the inner peripheral portion of the rotor main body 8b having a short axial length,
It is configured to rotate around the output shaft 9 via 14b.

A mounting flange 15 is integrally formed at one end of the output shaft 9, and the mounting flange 15 is fixed to the hub 3a of the wheel 3 with bolts 16 and nuts 17. One end of the output shaft 9 has a shaft insertion hole 61 of the outer case 61.
A bearing 18 such as a ball bearing is rotatably supported at a, and the other end is rotatably supported in a central recess of the inner case 62 through a bearing 19 such as a ball bearing.
The output shaft 9 is inserted (penetrated) in the shaft insertion hole 8a of the rotor 8 in a non-contact state.

The electric motor 4 whose main constituent elements are the stator 70 and the rotor 8 is a flat brushless electric motor having a short axial length, and the dimension of the wheel motor 1 as a whole in the output shaft 9 direction is short. Is configured to be.
The output rotation speed of the electric motor 4 is 750 rpm.

A plurality of gear speed reducers 5 (four gears in this embodiment) are used.
(2 pieces) gears 5a, 5b, 5c, 5d. That is, the first gear 5a is integrally formed concentrically on the other end side (the left end side in FIG. 1) of the rotor 8 as described above. Second and third gears 5b, 5c
Are fixed to the same rotary shaft (support shaft) 20 so as to rotate integrally with each other, and the second gear 5b is meshed with the first gear 5a.

The support shaft 20 is arranged eccentrically with the output shaft 9 and below the output shaft 9. One end of the support shaft 20 is rotatably supported in a recess of the partition plate 63 via a bearing 21 such as a ball bearing, and the other end is rotatably supported in a recess of the outer case 61 via a bearing 22 such as a ball bearing. .

The fourth (final stage) gear 5d is fixed to the output shaft 9 so as to rotate integrally with the output shaft 9. The third gear 5c is meshed with the fourth gear 5d.
Therefore, when the rotor 8 rotates due to the rotating magnetic field of the stator 70, the first gear 5a integrally formed with the rotor 8 rotates at the same rotation speed as the rotor 8. The rotation output of the first gear 5a is transmitted to the fourth gear 5d after being decelerated by the second and third gears 5b and 5c, and the output shaft 9 and the wheel 3 are rotated by the fourth gear 5d as the fourth gear 5d is decelerated. It rotates in the same direction as the rotor 8 at the same rotation speed as 5d.

For example, when the rotor 8 rotates forward at 750 rpm, the rotation output shaft 9 and the wheel 3 are connected to each other by the gear reducer 5
The speed is reduced by 150 rpm and the positive rotation is performed at 150 rpm, and the speed reduction ratio is 1/5.

At the center of the partition plate 63, the rotor body 8b is provided.
Insertion hole 6 for inserting (penetrating) the axial length of the non-contact state
3b is formed. A first board 23 for forming a control circuit for driving the electric motor 4 is provided in an isolated space S formed by the partition plate 63 and the partition wall portion 61b of the outer case 61 in which the gear reduction 5 is not arranged. Are attached by screws (not shown). Further, on the back surface of the partition plate 63 (the surface opposite to the surface on which the first substrate 23 is arranged), a doughnut-shaped first drive circuit for driving a electric current to the electric motor 4 driven by a signal from the control circuit. Two substrates 25 are attached.

Various circuit elements (not shown) constituting a control circuit for driving the electric motor 4 are attached to the first substrate 23, and the field coil 73 is connected to the donut-shaped second substrate 25. A power transistor (power MOSFET) 25a for supplying current is attached. An insulating sheet film (not shown) is interposed between the partition plate 63 and the first substrate 23 and the second substrate 25.

The position of the rotor 8 of the electric motor 4 is determined by the position detector 2
Detected at 6. The position detector 26 includes a ring-shaped magneck 26a embedded in the upper surface of the rotor 8 and magnetic poles attached at a predetermined angle (for example, 120 degrees) at a position on the second substrate 25 facing the ring-shaped magneck 26a. It is composed of a sensor 26b.

A magnetic sensor such as a Hall element may be used as the magnetic pole sensor 26b, and the position detecting section 26 may be composed of various known means such as position detection by an optical sensor. is there.

Next, assembling of the stator 70 is shown in FIG.
Will be described with reference to.

The magnetic pole portion core 71 has a ring-shaped connecting portion 71.
a plurality of magnetic pole teeth 71b radially extending from a toward the outside
A magnetic thin plate having a forming projection and a tip portion having a slightly narrow width is punched and formed by a press die, and a predetermined number of the magnetic thin plates are laminated to form a laminated structure.

The magnetic thin plates laminated by welding the tips of the magnetic pole teeth 71b in the laminating direction are integrally combined to form the magnetic pole core 71.
Is formed.

Next, a coil bobbin 73 around which a field coil 74 is wound is inserted around each magnetic pole tooth 71b to wind a three-phase winding.

Similar to the magnetic pole portion iron core 71, a plurality of ring-shaped magnetic thin plates each having a fitting groove and a plurality of small groove forming notches formed in the inner peripheral portion are punched by a press die, and a predetermined number of the magnetic thin plates are formed. After stacking, the yoke core 72 is formed by welding (not shown) the outer peripheral portion in the stacking direction similarly to the magnetic pole core 71.

After the magnetic pole portion core 71 and the yoke portion core 72 are formed, the magnetic pole portion is formed so that the tips of the magnetic pole teeth 71b of the magnetic pole portion core 71 are fitted into the corresponding fitting grooves 72a of the yoke portion core 72. The stator 70 is assembled by press-fitting and fitting the iron core 71 and the yoke portion iron core 72.

By the way, in the above manufacturing process, a dimensional error between the tip of each magnetic pole tooth 71b of the magnetic pole core 71 and each fitting groove 72a of the yoke core 72, each magnetic pole tooth 71.
Burrs and the like at the tip of b and the fitting grooves 72a may occur. However, the magnetic pole core 71 is replaced by the yoke core 7
If the fitting is too tight due to dimensional error, flash, etc., when fitting with 2, the semicircular small groove 72b in the fitting groove 72a of the yoke core 72 is deformed so as to spread and absorb the stress. From the connecting portion 7 of the magnetic pole portion iron core 71
The distortion and the like of 1a are suppressed. In this case, as in the present embodiment, by setting the fitting depth D between the magnetic pole teeth 71b and the fitting groove 72a to be 1/2 or more of the width W of the yoke core 72, The entire core 72 is reasonably deformed, and the above-described distortion suppressing effect is further enhanced.

Further, when punching a magnetic thin plate constituting the magnetic pole portion iron core 71 with a press die, it is general to separate the slot punching step and the split punching step. In this case, for example, FIG. ), The tip of the magnetic pole tooth 71b may be formed at a position slightly deviated from a predetermined position due to a processing error (deviation in the rotational direction of the press die). However, even if the tips of the magnetic pole teeth 71b are formed at positions slightly deviated from the predetermined positions,
Since the width of the tip of the magnetic pole teeth 71b is set narrow,
Since the position of the tip of the magnetic pole tooth 71b is within the width of the magnetic pole tooth 71b, it is easy to insert the coil bobbin 73 from the tip. For example, the magnetic pole tooth 71b as shown in FIG.
It is possible to prevent the coil bobbin 73 from being unable to be inserted due to the displacement of the tip end of the.

Although the electric motor to which the stator of the present invention is applied has been described in this embodiment, it is not necessary to mention that the stator of the present invention can be applied to a generator.

[0052]

As described above, according to the stator of the rotating electric machine according to the first aspect, a plurality of magnetic thin plates are laminated and the tip portions of the magnetic pole teeth of the laminated magnetic thin plates are welded. Since the magnetic pole core is formed by the magnetic pole teeth, it is possible to minimize the occurrence of magnetic flux leakage in the magnetic pole teeth and increase in iron loss, and at the same time, to weld from the tip of the magnetic pole teeth to the bottom of the fitting groove of the yoke core. Since the small groove for accommodating the portion is formed, the gap between the inner wall of the fitting groove of the yoke core and the fitting portion of the magnetic pole tooth becomes very small, and the fitting groove of the yoke core and the magnetic pole tooth fit. It is possible to suppress an increase in magnetic resistance in the joint portion to a small level.

Further, when the magnetic pole core and the yoke core are fitted together, a dimensional error occurs between each magnetic pole tooth of the magnetic pole core and each fitting groove of the yoke core, the tip of each magnetic pole tooth, and the yoke. When fitting is too tight due to burrs generated in each fitting groove of the core core, the small groove part in the fitting groove of the yoke core deforms to spread and absorbs the stress. It is possible to suppress a change (distortion or the like) in the inner diameter of the connecting portion of the.

According to the stator of the rotating electric machine of the second aspect, the fitting depth between the magnetic pole teeth and the fitting groove is set to be 1/2 or more of the radial width of the yoke core. When the magnetic pole core and the yoke core are fitted together, a dimensional error occurs between each magnetic pole tooth of the magnetic pole core and each fitting groove of the yoke core, the tip of each magnetic pole tooth, and each fitting of the yoke core. Even if there is burrs or the like generated in each of the interlocking grooves, the entire yoke core is reasonably deformed, and the above-described distortion suppressing effect is further enhanced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a configuration of a vehicle wheel motor to which an embodiment of a stator of a rotary electric machine of the present invention is applied.

FIG. 2 is a cross-sectional view showing the structure of a stator of the vehicle wheel motor shown in FIG.

3 is a schematic view showing a fitted state of magnetic pole teeth of a magnetic pole part core of the stator of FIG. 2 and a fitting groove of a yoke part core.

FIG. 4 is a schematic view showing an example of a fitted state of magnetic pole teeth of a magnetic pole portion core and a fitting groove of a yoke portion core when the stator of FIG. 2 is assembled.

FIG. 5 is a perspective view showing a configuration of a magnetic pole portion iron core of a conventional stator.

FIG. 6 is a plan view showing the magnetic pole core of FIG. 5;

7 is a perspective view showing a configuration of a yoke core that constitutes a stator by fitting with the magnetic pole core of FIG. 5. FIG.

[Explanation of symbols]

 4 ... Electric motor (rotary electric machine) 8 ... Rotor 60 ... Housing 70 ... Stator 71 ... Magnetic pole part core 71a ... Coupling part 71b ... Magnetic pole teeth 71c ... Welding part 72 ... Yoke part core 72a ... Fitting groove 72b ... Small groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Iijima 1-4-1 Chuo, Wako-shi, Saitama Stock Research Institute Honda Technical Research Institute

Claims (2)

[Claims] 1. A magnetic pole portion core having a plurality of magnetic pole teeth radially extending outward from a ring-shaped coupling portion through which a rotor is inserted, and an outer side of the magnetic pole portion core. And a yoke iron core having a plurality of fitting grooves formed in an inner peripheral portion thereof, and the magnetic pole teeth are respectively fitted in the corresponding fitting grooves. In the above, the magnetic pole portion core is formed by laminating a plurality of magnetic thin plates and welding the tip portions of the magnetic pole teeth of the laminated magnetic thin plates, and at the bottom of the fitting groove of the yoke core, A stator for a rotating electric machine, characterized in that a small groove for accommodating the welding position protruding outward from the tip end surface of the magnetic pole tooth is formed. 2. The fitting depth between the magnetic pole teeth and the fitting groove is set to ½ or more of a radial width of the yoke core. Stator of rotating electric machine.