JPH09149569A - Stator and rotating electric machine using that stator, and stator assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotating electric machine which is small and favorable in property. SOLUTION: A stator iron core 3A comprises a stacked iron core piece 310 at the rear part and a stacked iron core piece 320 at the tooth part. The iron core piece 310 is in the shape of a circle with a specified width in diametrical direction, and a specified number of iron core pieces 31 provided with cuts 31b at equal intervals at the inside periphery are stacked. The iron core piece 320 is in the shape of an oblong with a specified width, and a specified number of iron core pieces 32 provided with projections to engage with the cuts, at on end in its longitudinal direction, and tongue pieces 32c on both sides in width direction of the opposite ends are stacked, and the projection is engaged with the cut 31b, and a slot 3c to accommodate the stator coil is made of the edge in longitudinal direction of the engaged iron core piece 320, the edge in longitudinal direction of the adjacent iron core piece 320, and the inside periphery of the iron core piece 310.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core, a rotating electric machine using the stator core, and a method for assembling the stator core, and more particularly to a general-purpose electric motor having a relatively small capacity such as an induction motor and a synchronous machine. It is about.

[0002]

2. Description of the Related Art A rotary electric machine such as a general-purpose induction motor having a relatively small capacity will be described with reference to FIG. FIG. 7 is an overall configuration explanatory view including a partial sectional view of a conventional rotating electric machine, and FIG.
FIG. 4 is a sectional view of a stator of a conventional rotating electric machine. In FIG. 7, the upper half is a sectional view and the lower half is an outline drawing.
As shown in the figure, reference numeral 1 denotes a housing, which is also called a frame or a frame, and is formed into a substantially cylindrical shape by casting an iron-based material such as cast iron, and constitutes a casing of an electric motor. Reference numeral 1a is a heat radiation fin, which is in the form of a strip extending in the axial direction, is integrally cast with the housing 1, and is radially formed on the entire outer peripheral surface thereof. Reference numerals 2A and 2B are end brackets, which are also called bearing brackets. The bearings 4A and 4B at both ends of the electric motor rotating shaft 6 (described later) are housed, and the housings 1 and 2 are fitted with spigot fittings. Has become.

As shown in FIG. 8, 3'is a stator,
Stator core 3A 'made of laminated silicon steel sheets
And a plurality of slots 3C provided in the inner peripheral portion of the stator core 3A 'to form a core.
It is composed of a stator coil 3B wound around C.
Reference numeral 5 denotes a rotor, which has a rotary shaft 6, and the rotary shaft 6 is rotatably held by bearings 4A and 4B of the end brackets 2A and 2B. It is configured to rotate at a position facing the stator 3.

In such a conventional electric motor, the stator 3'is previously inserted into the housing 1 and attached to the inner peripheral wall thereof, and then the rotor 5 is inserted into the stator 3 '. Then, the bearings 4A and 4B are fitted to the rotary shaft 6 so that the end brackets 2A and 2B are fitted to both ends of the housing 1, respectively, by a plurality of bolts (not shown) extending in the axial direction. , Housing 1
It is designed to be fixedly attached to and assembled.

One end side (right side in the drawing) of the rotary shaft 6 is inserted into the bearing 4B of the end bracket 2A and protrudes to the outside to form an output shaft, and the other end side (left side in the drawing) of the end bracket 2A. An external cooling fan 9 (hereinafter, referred to as an external fan) is attached to a portion protruding from the bearing 4A. Reference numeral 10 denotes an end cover, which forms a cover for covering the outer fan 9. The end cover 10 is provided with an opening 10a (hereinafter referred to as a ventilation inlet) for taking in outside air with the external fan 9.

The opposite side of the opening 10a is formed into an open cylindrical shape or a deformed cylindrical shape, thereby forming a radial gap between the end bracket 2A and the outer diameter portion of the housing 1. The ventilation outlet 10b is formed. Therefore, the rotor 5 causes the outer fan 9
When is rotated, the outside air is sucked in from the ventilation inlet 10a of the end cover 10 and blown out from the gap 10b, whereby the outside air is vented to the outer surfaces of the end bracket 2A and the housing 1 and the end bracket 2B. However, a cooling effect is obtained.

As described above, the rotor 5 is mounted in the housing 1 of the rotary shaft 6 at a position facing the stator 2. The rotor 5 has a secondary conductor bar (not shown). An end ring 7 is provided, and an internal cooling fan 8 (hereinafter referred to as an inner fan) is formed integrally with the end ring 7. The inner fan 8 is composed of a plurality of blade blades axially protruding from both end surfaces of the end ring 7, and circulates air inside the electric motor to obtain a cooling action.

That is, the air flow generated by the inner fan 8 is the rotor 5, the end ring 7, and the stator coil 3B.
After passing through both end surfaces of the stator core 3A 'while cooling, heat is obtained when passing along the inner surfaces of the end brackets 2A, 2B whose temperature rise is relatively lower than that of the housing 1. -ing

[0009]

By the way, in a general electric rotating machine, miniaturization and weight reduction are always major issues.
Although there are many factors that determine the size of the rotating electric machine, the most important factor among them is that various losses other than windage loss are converted into heat, and this heat causes the temperature inside the machine to rise. The temperature rise is determined by the balance between the amount of heat generated by various losses and the amount of heat released by cooling. Therefore, it is known that the housing is made of aluminum or an aluminum alloy. That is, when it is required to reduce the size and weight of a rotary electric machine, the housing material is made of aluminum or aluminum alloy which is light and has good thermal conductivity. Incidentally, the specific gravity is about 1/3 that of steel and the Young's modulus is about 1/3. , Non-ferrous metal with specific heat of about 2 times and thermal conductivity of about 3 times, and better transfer of heat generated inside the rotating electric machine to the housing to improve cooling, which results in lightweight housing itself. In addition, the size and weight of the rotating electric machine as a whole can be reduced.

However, although the above-mentioned conventional technique can achieve some results in reducing the weight of the rotating electric machine,
It cannot be said that sufficient consideration has been given to the improvement of the characteristics accompanying the miniaturization, and there are the following problems. First, when the rotating electric machine is downsized, the output is generally suppressed due to the temperature rise, and the characteristics thereof tend to be lower than those of the conventional ones, and particularly the maximum output and the stall torque (maximum torque) are reduced. On the other hand, in order to prevent these reductions, there was a problem that the exciting current had to be increased, the magnetic flux density increased, iron loss increased, and the power factor and efficiency thereof deteriorated.

In general, in order to downsize a rotary electric machine, there is a method of reducing the size of the rotor and the stator. However, in the method of reducing the size of the rotor, the volume ratio does not decrease. It is effective to do. In that case, in order to reduce the outer diameter of the stator and output the same torque, the magnetomotive forces must be the same. That is, it is necessary to configure the rotating electric machine without changing the magnetic load. In other words, it is important to keep constant the amount of magnetic flux per unit area of the stator (hereinafter referred to as magnetic flux density) without reducing the amount of magnetic flux generated in the stator.

However, since the volume of the stator is reduced in the same state as before the amount of magnetic flux was reduced,
The magnetic flux density increases more than before, and as a result, the magnetic flux density is saturated, so that the magnetic flux density does not reach a certain level or more, and the characteristics of the rotary electric machine deteriorate. Therefore, in order to configure without changing the magnetic loading so that the magnetic flux density does not saturate even if the stator becomes smaller, secure the area of each part of the magnetic path in the stator to be equal to the area before miniaturization. There is a need. As a result, since the slot area of the stator is reduced, there is a problem that the stator coil cannot be housed in the slot as it was before the miniaturization.

This problem has been solved in the prior art by mechanically protecting the stator coil from the electromagnetic force acting between the stator and the rotor.
Since the slots have a semi-closed type with a narrow entrance, and they were inserted one by one from the narrow opening grooves, the slots were irregularly arranged in the slot, and the coil storage ratio was equal to the slot volume. The volume ratio (hereinafter referred to as space factor) is 6
It was that it stayed in the 0% range, and there was a limit to coil storage.

Therefore, in order to further reduce the size, when the slot area is reduced as described above, the number of coils to be housed is smaller than in the conventional case and the number of windings is reduced, so that the exciting current must be further increased. However, there is a problem that the magnetic flux density is further increased, and the problem of the saturation characteristics of the magnetic flux density is further increased.

A first object of the present invention is to solve the above-mentioned problems of the prior art. The coil space factor can be surely increased even if the rotating electric machine is made compact and lightweight. It is to provide a stator capable of obtaining good characteristics. A second object of the present invention is to provide a rotating electric machine including the stator and having good electric motor characteristics. Further, a third object of the present invention is to provide a stator assembling method in which the stator coil can be easily inserted, the coil space factor is high, and good characteristics can be obtained.

[0016]

In order to achieve the above first object, the structure of the stator according to the first invention is such that a predetermined number of thin plates made of magnetic material are attached to the inner peripheral wall of the housing of the rotating electric machine. In a stator having a stator core formed by stacking and each slot accommodating a stator coil in an inner peripheral portion of the stator core, the stator core is divided into a back portion and a tooth portion, and the back portion Is formed by stacking a predetermined number of annular thin plates each having a predetermined width and provided on the inner peripheral portion with a plurality of engaging portions at equal intervals, and the tooth portion is engaged with the engaging portion at one end in the longitudinal direction. A predetermined number of rectangular thin plates having a predetermined width provided with other engaging portions and tongue portions on both sides in the width direction of the opposite ends of the engaging portions are formed by stacking the plurality of thin sheets. The other engaging portions are respectively engaged with the engaging portions to join the back portion and the tooth portion. And longitudinal edges of the teeth, the longitudinal edges of the other teeth adjacent, is characterized in that is formed by the inner peripheral portion of the back.

Another structure of the stator according to the first aspect of the present invention is the stator, wherein the stator core has a structure in which the back portion is formed by stacking first, second and third cores in the axial direction. , The first and third back portions are formed by providing a plurality of engaging portions on the inner peripheral portion at equal intervals, the second back portion is formed by providing a flat inner peripheral surface, the tooth portion, The other engaging portion that engages with the engaging portion of the back portion is provided at the engaging portion of the first and third back portions, and the flat portion of the back portion is provided at the portion engaging with the second back portion. It is characterized in that a flat surface that comes into contact with the surface is provided.

According to a second aspect of the present invention, there is provided a rotating electric machine having a stator core mounted on an inner peripheral wall of a housing and formed by laminating a predetermined number of thin plates made of a magnetic material, and an inner peripheral portion of the stator core. In a rotating electric machine using a stator having slots for accommodating a stator coil therein, any one of the above stators is used.

According to a third aspect of the present invention, there is provided a stator core assembling method, in which a predetermined number of thin plates which are attached to an inner peripheral wall of a housing of a rotating electric machine and which are composed of a back portion of a magnetic body and a plurality of tooth portions are laminated. In a method of assembling a stator iron core having slots formed from the back portion and the plurality of tooth portions on an inner peripheral portion thereof, and a stator coil housed in the slots, the back portion is provided with a plurality of engaging members. A predetermined number of annular thin plates each having a predetermined width and having a predetermined width are provided at the inner periphery at equal intervals, and the tooth portion is formed on the distal end portion in the longitudinal direction of the engaging portion. A predetermined number of rectangular thin plates having a predetermined width provided with the engaging portion and the tongue portions on both sides in the width direction of the opposite end thereof are formed by laminating a predetermined number, and then, the annular shape between the adjacent engaging portions of the back portion is formed. A stator coil with a predetermined shape is formed in a ring shape at a predetermined position in the radial center direction. Then, the other engaging portion of the tooth portion is engaged with each of the plurality of engaging portions of the back portion, and the longitudinal edge portion of the tooth portion and the length of another adjacent tooth portion are aligned. The edge portion in the direction and the inner peripheral portion of the back portion respectively form a slot portion for housing the stator coil.

The configuration of the above invention will be described in more detail. In the stator of the invention described above, when the stator core is configured as described above, the stator coil is housed in the space portion which becomes the slot in advance, and the tooth core piece is radially arranged in the notch portion of the back laminated core along the radial direction. When is inserted, a slot is formed in the space formed by the tooth portion of the tooth core piece, the tooth portion of the adjacent tooth core piece, and the inner circumference of the back laminated core, and inside the formed slot The stator coil is housed in the housing. Therefore, unlike the prior art, it is not necessary to press-fit the stator coil through the narrow opening of the slot entrance, so that a large number of conductors of the stator coil are accommodated in the slot.

Moreover, by engaging each tooth core piece with the back laminated core in the radial direction, a stator having slots for accommodating the stator coils can be formed, so that a stator coil composed of a large number of conductors can be formed. Compared to the prior art in which each slot is sequentially press-fitted, a large number of stator coils can be stored very easily, and despite the slot area being reduced, the coil space factor in the slot can be reduced. It is something that is surely raised.

Further, the rotating electric machine is provided with the stator core as described above, and since the coil space factor in the slot can be increased by the stator core, the outer diameter of the stator can be reduced and the slot volume can be reduced. Even if the size is reduced, the magnetic load of the rotating electric machine is not changed, and the rotating electric machine is excellent in electric characteristics and torque characteristics without being reduced in power factor and efficiency in spite of the reduction in size and weight. It was done.

[0023]

FIG. 1 is a block diagram showing an embodiment of the present invention.
It will be described with reference to FIG. FIG. 1 is an explanatory diagram of an induction motor using a stator according to an embodiment of the present invention, and FIG.
FIG. 3 is a schematic explanatory view of a stator according to an embodiment of the present invention.
2 is an assembly explanatory view of the iron core piece and the stator coil constituting the stator of FIG. 2, FIG. 4 is an explanatory view of a stator in which the stator core and the stator coil of FIG. 3 are assembled, and FIG. FIG. 6 is a schematic explanatory view of a stator according to another embodiment of the present invention, and FIG. 6 is a schematic explanatory view of a stator according to still another embodiment of the present invention.

[Embodiment 1] In the induction motor shown in FIG. 1, since the stator 3 and the stator core 3A are different from those of the conventional induction motor, the detailed description of the structure will be complicated. The description is omitted, and the parts related to the present embodiment will be briefly described. As shown in the figure, a stator 3 is attached to the inner peripheral wall of the housing 1, and the stator 3 has a stator core 3A formed by laminating a predetermined number of magnetic materials such as silicon steel plates in the axial direction, It has a stator coil 3B housed in a slot 3C of the stator core 3A.

As shown in FIG. 2, in the stator core 3A, the core pieces constituting the stator core 3A are annularly shaped back laminated core pieces 310.
And a tooth portion laminated iron core piece 320 having a rectangular tooth portion, which are divided into two types, and the multiple laminated iron core pieces 320 are engaged and arranged at the annular inner edge of the laminated iron core piece 310. It is composed of

Although the back laminated iron core piece 310 is not shown in FIG. 3, the iron core piece 31 constituting the back laminated iron core piece 310 is shown in the figure. As shown, the iron core 31
Is formed with a back portion 31a having a predetermined width in the radial direction,
A plurality of cutout recesses 31b are provided on the inner circumference of the back portion 31a. The plurality of notch recesses 31b are formed by cutting in a concave shape from the peripheral edge of the inner ring portion of the iron core piece 31 at predetermined equal intervals. And such an iron core piece 31
The back laminated iron core 310 is formed by laminating a predetermined number of layers in the axial direction.

Similarly, in FIG. 3, the tooth portion laminated core piece 3 is described above.
Although not shown in FIG. 20, the iron core piece 32 constituting the element 20 is shown in the figure, and the description will be made with reference to this. As shown in the drawing, a toothed portion 32a having a predetermined width is formed in the longitudinal direction of the iron core piece 32 having a rectangular toothed portion, and tongue pieces 32c are provided on both sides of one end of the toothed portion 32a in the width direction so as to project. The convex portion 32b is provided at the other end so as to project.

By laminating a predetermined number of the rectangular iron core pieces 32 in the axial direction, the rectangular laminated iron core 320 is formed. The tooth portion laminated core 320 has a cutout concave portion 31b at an inner peripheral edge of the back portion laminated iron core 310.
In addition, when the stator 3 is inserted from the center side toward the radial direction of the stator 3, the protrusion 32b of each core piece 320 is inserted.
Are assembled with each other by engaging with the notch recesses 31b of the core piece 310, and the slots 3C are formed by the side edges in the longitudinal direction of the adjacent tooth portions 32a of the laminated core piece 320.

In this state, the rectangular laminated core piece 320 is provided with the cutout recess 31 of the back laminated iron core 310.
It will be arranged in rows at intervals of b. Also, slot 3
C is also the distance between the adjacent laminated core pieces 320. Although not shown, the stator coil 3B is formed in advance as a coil piece so as to have a shape that can be stored in the slot 3C.

A method of assembling the stator of the present embodiment configured as described above will be described with reference to FIGS. First, when the stator core 3A is assembled, a predetermined number of preformed stator coils 3B are annularly arranged and held at a predetermined position at a predetermined angle by a jig (not shown), and the stator coil 3B is attached to the stator coil 3B. On the other hand, the back laminated core 310 (not shown) on which the core pieces 31 are laminated is moved from the outer peripheral direction by a moving means such as an index (not shown), and is shown on both sides of the cutout recess 31b of the laminated core 310 by arrows in FIG. As described above, the stator coil 3B having a predetermined shape is positioned. After that, the tooth portion laminated core 320 on which the iron core pieces 32 are laminated is moved from the radial center of the stator coil 3B and the back portion laminated core 310 by a moving means (not shown) as shown by an arrow in FIG. Move along.

As shown in FIG. 4, when the protrusion 32b of the tooth laminated core 320 is inserted into and engaged with the notched recess 31b of the back laminated iron core 310, the inner peripheral edge between the notched recesses 31b of the back laminated iron core 310. And the tooth portion 32 of the tooth portion laminated core 320
The stator coil 3B can be housed in the slot 3C formed by a and the tooth portion 32a of the adjacent tooth portion laminated core 320.

In this way, the incorporation of the stator core 3A is
Conventionally, the slot was formed first, and then the stator coil 3B
In the present invention, the stator coil 3B is first positioned and arranged, and then the slot 3C surrounding the stator coil 3B is formed. Further, in general, when the stator has a split structure in which a stitch is formed in this manner, leakage magnetic flux at the stitch becomes a problem, but in the present embodiment, since the gap at the stitch is about μ, it does not cause a problem.

Therefore, the preformed stator coil 3B
By assembling the back iron core 310 and the tooth iron core 320, in which the stator iron core 3A is divided and formed, the stator coil 3B can be stored in the slot 3C easily and accurately. Therefore, it is not necessary to press-fit the stator coil 3B into the slot as in the conventional technique, so that a large number of the stator coils 3B can be housed in the slot.

Moreover, the tooth core piece 32 is moved from the center side of the stator 3 in the radial direction and inserted between the stator coils 3B arranged and held between the notches 31b for the slots 3C of the laminated core. For example, since the stator core 3A can be formed, it is possible to store the stator coil very easily as compared with the conventional technique in which the stator coils made of a large number of conductors are press-fitted into the slots one by one.

Therefore, although the area of the slot 3C is reduced, the coil space factor in the slot can be surely increased. In the prior art, the coil width is controlled by the diameter of one coil because the coil is guided and housed in the slot 3C in which the inner surface of the stator core 3A is provided with the inlet groove having a slight width. Therefore, in order to improve the characteristics of the rotary electric machine, it has been limited to arbitrarily select the groove width. However, as described above, the back core piece 3
If the tooth core piece 32 is inserted into 1 and engaged, the stator coil 3
Since B can be stored, the groove width is not limited as in the prior art, the design latitude of the rotating electric machine is increased, and the optimum design can be achieved.

Further, the tongue piece 32c is formed at the tip of the tooth part 32b of the tooth part core piece 32, and the tongue piece 32c forms an opening narrower than the width of the slot 3C. There is no possibility that the conductor will come out from the inside of the slot 3C, and the gap between the tongue piece 32c and the core piece 32c adjacent in the circumferential direction can be made small, so that the noise generated when rotating is reduced. You can also do it.

The present embodiment is not limited to the embodiment described with reference to FIGS. 2, 3 and 4, and many modifications are conceivable. FIG.
Another embodiment will be described with reference to FIG. In FIG. 5, the stator core 3A is the back core piece 3 described in FIG.
1 is divided into three to form a fan-shaped iron core piece 33, and when the iron core piece 33 is laminated in the axial direction, the iron core pieces 33 are laminated at an arbitrary angle so that the seams of the divided portions 33c do not coincide with each other. Is.

Further, as shown in the figure, the notched recess 33b of the fan-shaped iron core piece 33 is formed in a wedge shape. The tooth portion core piece 34 has a rectangular tooth portion 34a having an appropriate width as described in FIG. 3, and a tongue piece 34c is also formed at one end in the longitudinal direction. This tooth core piece 34
Inserts and engages with the notch recess 33b of the iron core 33 to form the slot 3C by the tooth portion 34a of the tooth core piece 34 and the tooth portion 34a of the adjacent tooth core piece 34a. . Therefore, the stator coil is
Similar to the third and fourth embodiments, if they are previously arranged at predetermined positions, they can be easily stored in the slot 3C.
In addition, according to the embodiment of FIG. 5, when the back iron core pieces 33 are laminated in the axial direction, the dividing portions 33c are formed so as to be shifted in the circumferential direction, so that the effect of dividing the iron core back portion is reduced. To be In addition, the engaging portions of the core pieces do not lie on the same line when viewed in the axial direction, and are arranged in the circumferential direction while intersecting, so that the laminated state of the core pieces can be made firm.

[Second Embodiment] Next, another embodiment of the stator according to the present invention will be described with reference to FIG.
In the embodiment shown in FIG. 6, the back laminated core piece is axially divided into three parts, of which two laminated core pieces 33 are provided with cutout recesses 33b, and the other laminated core piece 33 'is provided. The cutout recesses 33b are formed without providing them, and as shown by the arrows in the figure, two laminated core pieces 33 are vertically placed in the axial direction to sandwich the other laminated core piece 33 'to form three layers. It is configured by stacking. On the other hand, in the tooth portion laminated core piece 34, the tooth portion laminated iron core piece 34 has the back portion laminated iron piece 3
34a provided with a convex portion 34b for engaging with 3 and the convex portion 3
A tooth laminated core piece 34 'having no 4b is provided. When these tooth laminated core pieces 34 are laminated in the axial direction, the tooth laminated core pieces 34 ′ are laminated so that the tooth laminated core pieces 33 ′ are inserted in the portions corresponding to the back laminated iron core pieces 33 ′. After arranging the child coils, the tooth laminated core pieces 34 are moved as shown by the arrows in the figure, and are engaged with the back laminated core pieces 33, 33 'to form a stator. In this embodiment, since the engaging portion does not require a complicated shape, the iron core can be easily assembled.

[0040]

As described above in detail, according to the structure of the stator according to the first aspect of the present invention, the stator coils are respectively attached to the engaging portions of the laminated core pieces only by moving the laminated core pieces. Since the slot that can be stored is formed, it is not necessary to press fit the stator coil into the slot as in the prior art, and a large number of conductors of the stator coil can be stored in the slot. . Moreover, by moving each laminated core piece to form each slot and stator, it is possible to store the stator coil very easily. As a result, even if the area of the slot is reduced, the coil space in the slot is occupied. It has the effect of surely increasing the rate. According to the configuration of the rotating electric machine of the second invention,
With the stator core as described above, with the stator core,
Since the space factor of the coil in the slot can be increased, even if the outer diameter of the stator is reduced and the volume of the slot is reduced, the magnetic load of the rotating electric machine is not changed and the power factor and efficiency are reduced. There is no effect, and there is an effect of obtaining a rotating electric machine having good electric characteristics and torque characteristics. Further, in the stator assembling method according to the third aspect of the invention, first, the stator coil is annularly arranged at a predetermined position, and then each laminated core piece is moved to form each slot and the stator. ,
It is easy to insert the stator coil, has a high coil space factor, and has the effect of assembling a stator having good characteristics.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an induction motor using a stator according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a stator according to an embodiment of the present invention.

FIG. 3 is an explanatory view of assembly of an iron core piece and a stator coil that form the stator of FIG. 2;

FIG. 4 is an explanatory diagram of a stator in which the stator core and the stator coil of FIG. 3 are assembled.

FIG. 5 is a schematic explanatory view of a stator according to another embodiment of the present invention.

FIG. 6 is a schematic exploded view of a stator according to still another embodiment of the present invention.

FIG. 7 is an overall explanatory view including a partial cross-sectional view of a conventional rotating electric machine.

FIG. 8 is a sectional view of a stator of a conventional rotating electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... Radiation fin, 2A, 2B ... End bracket, 3 ... Stator, 3A ... Stator core, 3B ...
Stator coil, 3C ... Slot, 31, 33, 33 '...
Back laminated core pieces, 31a, 33a ... Back, 31b, 33
b ... Notch recessed portion, 32, 34, 34 '... Toothed portion laminated core piece, 32a, 34a ... Toothed portion, 32b, 34b ... Convex portion, 3
2c, 34c ... Tongue piece, 33c ... Dividing part, 4A, 4B ... Bearing, 5 ... Rotor, 6 ... Rotating shaft, 7 ... End ring, 8 ...
Inner fan, 9 ... Outer fan, 10 ... End cover, 10a
... Ventilation port, 10b ... Ventilation outlet, 310, 320 ... Laminated iron core

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsukio Sekine, 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside Hitachi, Ltd. (72) Inventor Izumi Shimizu 4-6-Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. In-house (72) Inventor Yukio Endo 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Matsuri 4--6 Kanda Surugadai, Chiyoda-ku, Tokyo In Hitachi, Ltd. (72) Inventor Ryuichi Iwata 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Takahiro Takeda 7-1 Higashi Narashino-cho, Narashino, Chiba Prefecture Hitachi Industrial Equipment Division

Claims (4)

[Claims] 1. A stator core attached to an inner peripheral wall of a housing of a rotating electric machine and formed by laminating a predetermined number of thin plates made of magnetic material, and a stator coil housed in an inner peripheral portion of the stator core. In the stator having each slot, the stator core is divided into a back portion and a tooth portion, and the back portion is provided with an annular thin plate having a predetermined width and a plurality of engaging portions provided in an inner peripheral portion at equal intervals. Formed by stacking a number of sheets, the tooth portion is provided with another engaging portion that engages with the engaging portion at one end in the longitudinal direction, and tongue portions on both sides in the width direction at the opposite end of the engaging portion. A predetermined number of rectangular thin plates having a predetermined width are stacked and formed, and each of the slots joins the back portion and the tooth portion by engaging the other engaging portion with the plurality of engaging portions. The longitudinal edge of the tooth portion, the longitudinal edge of another adjacent tooth portion, and the back portion of the tooth portion. A stator characterized by being formed with an inner peripheral portion. 2. The stator according to claim 1, wherein the stator core has a structure in which the back portion is formed by axially stacking first, second and third iron cores, The back portion is formed by providing a plurality of engaging portions on the inner peripheral portion at equal intervals, the second back portion is formed by providing a flat inner peripheral surface, and the tooth portion is formed by the first and third back portions. The other engaging portion that engages with the engaging portion of the back portion is provided in the portion that engages with, and the flat surface that abuts the flat surface of the back portion is provided in the portion that engages with the second back portion. Stator characterized by that. 3. A stator core attached to an inner peripheral wall of a housing and formed by laminating a predetermined number of thin plates made of a magnetic material, and slots for accommodating a stator coil in an inner peripheral portion of the stator core. A rotary electric machine using the stator, which comprises the stator according to claim 1. 4. A predetermined number of thin plates attached to an inner peripheral wall of a housing of a rotating electric machine and formed from a back portion of a magnetic body and a plurality of tooth portions are stacked, and the back portion and the plurality of tooth portions are formed on the inner peripheral portion thereof. In a method of assembling a stator core in which each slot is formed from and a stator coil that accommodates a stator coil in each slot, the back portion has a plurality of engaging portions at a predetermined width provided at equal intervals on the inner circumference. Formed by laminating a predetermined number of annular thin plates each having a tooth portion, and the tongue pieces on the both ends in the width direction of the tooth portion, the other engaging portion engaging with the engaging portion at the distal end in the longitudinal direction. A predetermined number of rectangular thin plates having a predetermined width are laminated and formed, and then stator coils of a predetermined shape are respectively formed at predetermined positions in the radial center of the annular shape between the adjacent engaging portions of the back portion. Annularly, and then the other engaging part of the tooth part is connected to the back part. Are engaged with a plurality of engaging parts of the stator, and the longitudinal edge of the tooth, the longitudinal edge of another tooth adjacent to the tooth, and the inner peripheral portion of the spine form the stator coil. A method for assembling a stator, characterized in that slot portions for accommodating the are formed respectively.