JP2000324735A - Stator of electric rotating machine and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of an electric rotating machine which can prevent the ventilation ducts of a stator core from deformation and avoid increase of pressure loss, when cooling gas is made to flow through the ventilation ducts and the manufacturing method of the stator. SOLUTION: The stator of an electric rotating machine has a stator core composed of a plurality of punched-out plates, which are punched out from thin steel plates and stacked and a plurality of ventilation ducts 1a which are formed in spaces formed partially in the piling direction of the punched-out plates by inserting spacers 2 between the piled punched-out plates. The thicknesses of the facing punched-out plates on the side facing the inside of the ventilation duct 1a are made larger than the thicknesses of other punched- out plates which are stacked directly.

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 and a method of manufacturing the same, and more particularly to a stator of a rotary electric machine for reducing a flow loss of a ventilation duct of a stator core and a method of manufacturing the stator. Things.

[0002]

2. Description of the Related Art A rotating electric machine such as a turbine generator includes a stator and a rotor. In a general rotating electric machine, the current flowing through the stator coil wound on the stator becomes large, so that cooling on the stator side is a design point.

[0003] To cool the stator, a ventilation duct is provided in the stator core. A ventilation duct is a radially inserted rod-shaped member, called a spacing piece, that is inserted radially in the direction connecting the inner and outer circumferences of the core to a part of the iron core in which many thin electromagnetic steel sheets are stacked. A gap is provided from the side to the outer circumference or vice versa, through which the cooling gas can freely pass. For example, in the case of a large turbine generator, it is provided every several tens of millimeters in the axial direction. For example, in the case of a generator having an iron core having a total length of 5 m in the axial direction, the number of stacked electromagnetic steel sheets is 10,000 or more, and the number of ventilation ducts in the axial direction reaches 100 or more.

[0004] When manufacturing a stator core including such a ventilation duct, electromagnetic steel plates called punched plates conventionally produced by punching from a steel plate are stacked while providing ventilation ducts at predetermined intervals, and finally stacked. The entire iron core is pressed in the axial direction to apply compression in the stacking direction to make the contact between the punched plates dense. The purpose of using such a method is to prevent loosening of the iron core due to warpage of the cut surface generated during the production of individual punched plates, and to secure the contact surface pressure between the punched plates to improve heat conduction in the core axis direction. It is in.

[0005] By the way, when stacking punched plates and manufacturing, a ventilation duct is formed by inserting spacing pieces. However, when a pressing load is finally applied to the iron core, there is a problem that the ventilation duct is crushed.

The phenomenon of collapse of the ventilation duct will be described with reference to FIGS. FIG. 21 is a cross-sectional view at right angles to the core axis showing a part of the ventilation duct portion of the stator core, and FIGS. 22 and 23 are enlarged cross-sectional views taken along arrows A and B in FIG. 21, respectively.

As shown in FIG. 21, the ventilation duct 1a is
The plurality of blanks 1 are formed by arranging spacing pieces 2 radially at equal intervals in the circumferential direction in a stacked portion of a predetermined number of the blanks 1 and providing a gap between the blanks 1. The ventilation duct 1a forms a flow passage through which the cooling gas can pass through the inner and outer peripheral sides of the stator core. The stator coil 3 is inserted into a slot formed on the inner peripheral side of the punched plate 1, and is fixed and held by a wedge 4.

In the stator core having such a structure, in particular, in the case of the indirect cooling system, that is, in the case of the system in which the stator coil 3 is cooled from outside the insulating material, a refrigerant is flowed inside the stator coil. Unlike the direct cooling method that cools
The heat of the stator coil 3 must be cooled by the cooling gas passing through the cooling duct together with the heat generated in the iron core itself.

However, in the related art, there is a problem that a part of the duct 1a is crushed and deformed in a pressing process of the entire iron core when the above-described iron core is manufactured, so that a flow passage area is reduced. That is, FIG. 22 is a view of the portion of the ventilation duct 1a shown in FIG. 21 viewed from the outer peripheral side (viewed from an arrow A), and shows a state in which the center of the duct 1a is particularly crushed and deformed by pressing. . FIG. 23 shows the ventilation duct 1a shown in FIG.
Is viewed from the inner peripheral side (viewed from the arrow B), and shows a state in which the spacing pieces 2 and the wedges 4 are alternately arranged. In particular, the iron core teeth portion 5 (the portion where the stator coil is inserted) is shown. In this case, a portion in which the cutting plate has the shape of a comb tooth is opened at the end of the tooth due to the pressing load, and the duct narrows in the opposite direction.

[0010]

In the ventilation duct 1a in which such crushing deformation occurs, the duct 1a into which the cooling gas enters is provided.
And the outlet loss of the outlet from which the cooling gas is discharged from the ventilation duct 1a increases. In this case, the flow velocity is increased or the flow is disturbed due to the narrowing of the flow path due to the collapse of the duct at the entrance or the exit of the duct 1a, and the entrance loss and the exit loss are greatly increased. Fluid analysis and measurement using a full-scale model of a certain turbine generator showed that the pressure loss of the fluid due to the deformation of the duct 1a was about 30
% Increase.

When the pressure loss of the duct 1a increases, the pressure loss of the entire ventilation passage inside the rotary electric machine increases, so that when the same cooling gas circulation fan is used, the total air volume is reduced and the required cooling is performed. If the temperature of the coil or iron core rises, or if the performance of the fan is improved to secure the flow rate of the cooling gas, the fan power is required more and the total loss of the rotating electric machine increases. And reduce the efficiency.

[0012] The present invention has been made in view of such circumstances, and prevents deformation of a ventilation duct of a stator core,
An object of the present invention is to provide a stator for a rotating electric machine that does not increase pressure loss when a cooling gas passes through a ventilation duct, and a method for manufacturing the stator.

[0013]

According to a first aspect of the present invention, there is provided a stator core comprising a stack of a plurality of punched plates formed from a thin steel plate,
A plurality of ventilation ducts are formed in a part of the stator core in the blanking plate stacking direction, and the ventilation ducts are rotated by gaps generated by inserting spacing pieces between the blanking plates to be stacked. In the stator of the electric machine, the thickness of the punched plate on the side facing the inside of the ventilation duct opposed to the space piece is thicker than other punched plates directly stacked, To provide a stator for a rotating electric machine.

According to the present invention, deformation of the iron core punching plate facing the inside of the ventilation duct on the side facing the inside of the ventilation duct can be prevented by using a material thicker than other punching plates.

According to a second aspect of the present invention, in the rotating electric machine stator according to the first aspect, a portion between the circumferentially adjacent spacing pieces of both sides or one side of the cutout plate facing each other across the spacing piece, A stator for a rotating electric machine, wherein a notch is formed by removing a certain area from an outer peripheral end toward an inner peripheral side.

According to the present invention, even if the cutout plate is deformed during the pressing of the iron core,
In the notch on the outer peripheral end side, the ventilation duct is not narrowed by the thickness of the punched plate.

According to a third aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, the inner peripheral end located on the teeth portion side of the opposite side or one side of the cutout plate with the interval piece interposed therebetween is the interval piece. A stator for a rotating electrical machine, characterized in that a notch in which a certain area is removed from a part toward a slot part is formed.

According to the present invention, even if the cutout plate is deformed during the pressing of the iron core,
In the notch portion on the inner peripheral side of the teeth portion, the ventilation duct is not narrowed by the thickness of the cutout plate as described above.

According to a fourth aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, the punched plates on both sides or one side sandwiching the spacing piece and the punched plates adjacent thereto are made of materials having different linear expansion coefficients. A punched plate is joined to each other, and of the two joined punched plates, the punched plate facing one side of the spacing is formed of a material having a larger linear expansion coefficient than the adjacent punched plate. And a stator for a rotating electric machine.

According to the present invention, the punched plate on the side facing the inside of the ventilation duct is made by firmly joining two punched plates made of different materials, applying a material having a different linear expansion coefficient, and linearly expanding each punched plate. Due to the difference between the coefficients and the like, the core temperature rises during the operation of the rotating electric machine, so that the ventilation duct is deformed in the direction in which the ventilation duct is widened by the bimetal action of the punched plate sandwiching the spacing piece.

According to a fifth aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, a part of the outer peripheral end side of one or both of the cutout plates opposed to each other across the spacing piece is in a direction opposite to the ventilation duct side. The present invention provides a stator for a rotating electric machine, wherein iron cores are laminated using a punched plate provided with a warp curved toward the rotating electric machine.

According to the present invention, deformation of the ventilation duct at the time of pressing the core can be prevented by laminating the iron cores using the punched plate provided with the warp in the direction opposite to the ventilation duct side.

According to a sixth aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, the spacing piece and the opposite of the spacing piece are provided at the tips of the teeth portions of both sides or one side of the cutout plate facing each other across the spacing piece. Provided is a stator for a rotating electric machine, wherein iron cores are laminated using a punched plate provided with a warp curved toward a side.

According to the present invention, the core is laminated at the tip end of the teeth of the punched plate by using a punched plate provided with a warp in the direction opposite to the ventilation duct side in advance, so that the ventilation duct at the time of pressing the iron core as described above. The flow loss can be greatly reduced especially at the position where the flow path is narrowest on the inner peripheral side of the ventilation duct where the flow velocity of the cooling gas is high.

According to a seventh aspect of the present invention, there is provided a stator core formed by stacking a plurality of punched plates formed from a thin steel plate, and a plurality of the stator cores are partially spaced in the stacking plate stacking direction. Forming a ventilation duct, the ventilation duct, in the stator of the rotating electrical machine formed by a gap generated by inserting a spacing piece between the punched plates stacked, in addition to the spacing piece forming the ventilation duct portion, A stator for a rotating electric machine, characterized in that a spacing piece shorter than the spacing piece is inserted on the outer peripheral end side of the blanking plate.

According to the present invention, in addition to the spacing piece forming the ventilation duct portion, a spacing piece shorter than the spacing piece is inserted into the outer peripheral side of the punched plate, so that the iron core has the widest portion on the outer periphery side of the ventilation duct. Of the ventilation duct can be prevented.

[0027] In the invention according to claim 8, a stator core is formed by stacking a plurality of punched plates formed from a thin steel plate. In the stator of the rotating electrical machine formed by a gap formed by inserting a spacing piece between the blanks to be stacked, the ventilation duct is formed by a blanking plate of the spacing piece. A stator for a rotating electric machine, characterized in that a recess is provided on the joining side, and a stator core is formed using the spacing pieces.

According to the present invention, by providing a recess on the side of the punching plate of the spacing piece forming the ventilation duct, the recess of this spacing piece tends to spread the ventilation duct on the blanking plate during core pressing. , Which can prevent the ventilation duct from collapsing.

According to the ninth aspect of the present invention, there is provided a stator core formed by stacking a plurality of punched plates formed from a thin steel plate, and a plurality of the stator cores are spaced apart from each other in the stacking plate stacking direction. Forming a ventilation duct, the ventilation duct, in the method of manufacturing a stator of a rotating electrical machine formed by a gap formed by inserting a spacing piece between the punched plates stacked, the inner peripheral side of the ventilation duct and A method for manufacturing a stator for a rotating electric machine, which comprises inserting a spacer having the same thickness as the width of the ventilation duct into at least any part on the outer peripheral side, and then applying a press load to the iron core. provide.

According to the present invention, when the stator core is manufactured, a spacer having the same thickness as the width of the ventilation duct is inserted into the inner peripheral side or the outer peripheral side of the ventilation duct, and then a pressing load is applied to the iron core. In addition, deformation during pressing can be prevented.

According to the tenth aspect, in the ninth aspect,
In the above-described method for manufacturing a stator for a rotating electric machine, there is provided a method for manufacturing a stator for a rotating electric machine, wherein the spacer sandwiches a sheet-shaped member on both sides in the width direction of the ventilation duct.

According to the present invention, the spacer can be easily removed after pressing the iron core by sandwiching the sheet-like member of the polymer material on both sides of the spacer.

[0033] According to the eleventh aspect of the present invention, there is provided a stator core formed by stacking a plurality of punched plates formed from a thin steel plate. Forming a ventilation duct, the ventilation duct, in the method of manufacturing a stator of a rotating electrical machine formed by a gap formed by inserting a spacing piece between the punched plates to be stacked, after applying a core press load, A wedge-shaped jig is applied to each ventilation duct portion, and a deformation on the inner peripheral side or the outer peripheral side of the ventilation duct is corrected by applying a pressing force or a hitting force or both of the jigs to the jig. Provided is a method for manufacturing a stator of a rotating electric machine.

According to the present invention, after a core press load is applied, a step of applying a wedge-shaped jig to each ventilation duct portion and hitting it with a hammer or the like to correct deformation on the inner peripheral side or outer peripheral side of the ventilation duct is added. Thereby, the ventilation duct deformed by the press can be corrected, and the pressure loss of the cooling gas can be reduced.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment (FIGS. 1 and 2) Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view showing a cross section perpendicular to the core axis of a stator of a rotating electric machine according to a first embodiment of the present invention.
(A) and (B) are enlarged views taken along arrows C and D in FIG. 1, respectively.

The stator core of the rotary electric machine according to the present embodiment is formed by stacking punched plates 1 made of thin electromagnetic steel plates in the axial direction of the core. It is inserted and fixed and held by the wedge 4. In order to cool the heat generated in the stator coil 3 and the iron core during operation of the rotary electric machine, ventilation ducts 1a are provided at predetermined intervals in the core axis direction. That is, when the punched plates 1 are laminated, a plurality of spacing pieces 2 are radially inserted at certain intervals in the circumferential direction so that the cooling gas flows from the inner circumference side to the outer circumference side of the stator core or vice versa. A ventilation duct 1a is provided as a flow path through which the air flows.

In the present embodiment, the punched plates 1 (8) on both sides (the side facing the inside of the ventilation duct 1a) sandwiching the spacing piece 2
Is formed of a plate having a sufficient thickness with respect to the other blanking plate 1 (7). That is, FIG.
As shown in an enlarged manner in FIG.
Are formed on both sides of the spacing piece 2. These figures 2
In (A) and (B), the vertical direction of the drawing is the core axis direction, and for example, the other punched plates 7 mainly constituting the iron core.
Is 0.35 mm, the thickness of the blank 8 facing the ventilation tact 1 a is 0.5 mm or more.

According to the present embodiment, the thickness of the iron core punching plate 8 on the side facing the inside of the ventilation duct 1a is made of a material thicker than the other punching plates 7, so that the deformation toward the ventilation duct side is prevented. Can be prevented.

Second Embodiment (FIGS. 3 and 4) FIG. 3 is a view showing a cross section perpendicular to the core axis of a stator of a rotary electric machine according to a second embodiment of the present invention. Are formed by the spacing piece 2 and two punched plates 1 sandwiching the spacing piece 2. The spacing piece 2 is fixed to one of the two punched plates 1 sandwiching it by welding. The blank 1 to which the spacing piece 2 is welded appears as shown in FIG. 3, and the blank 1 to which the spacing piece 2 is not welded appears as shown in FIG.

In the present embodiment, a notch 9 is provided on the outer peripheral end side of the punched plate 1 so as to avoid the space piece 2, and the teeth 5 on the inner peripheral end side of the punched plate 1 A notch 11 facing the slot 10 is provided except for the space piece 2. Each of these cutouts 11 has a rectangular shape from the end side of the blank 1 and has a shape in which the corners are curved.

According to the present embodiment having such a configuration, the two punched plates 1 sandwiching the spacing piece 2 forming the ventilation duct 1a.
By notching the outer peripheral side of, the crush deformation of the ventilation duct 1a due to the iron core press load can be suppressed. This is because the punched plate 1 is deformed by the press load so as to crush the ventilation duct 1a, but the middle portion of the interval piece on the outer peripheral end side of the punched plate 1 on the ventilation duct 1a side where the crushing deformation is increased is cut off. Therefore, it is possible to prevent the thickness of the punched plate 1 from being crushed.

For example, it is assumed that the width of the ventilation duct 1a is 8 mm, and the ventilation duct 1a is crushed by 1 mm at the maximum at the time of pressing the iron core, and the duct width becomes 7 mm. In this case, the ventilation duct 1a
Assuming that the thickness of the cutout plate 1 on the side is 0.5 mm, the duct width becomes 7 mm if there is no notch 9. However, by providing this notch 9, the duct width becomes 7 mm + 0.5 mm. × 2 = 8 mm, and the deformation due to the press load can be offset.

The same applies to the case where the notch 11 is provided in the teeth portion 5 of the blanking plate 1. If the notch 11 is not provided, the duct width becomes 7 mm. The duct width is 7mm + 0.5
mm × 2 = 8 mm, and the effect of being able to cancel the deformation due to the press load can be obtained.

Third Embodiment (FIGS . 5 and 6) FIGS. 5 and 6 illustrate a third embodiment of the present invention. FIG. 5 shows a ventilation duct of a stator core from an outer peripheral side.
FIG. 6 is shown from the inner peripheral side.

In the present embodiment, the cutout plates 1 on both sides of the spacing piece 2 forming the ventilation duct 1a with the ventilation duct 1a interposed therebetween are formed by firmly joining two plates 12, 13 respectively. The plates 12 and 13 have different coefficients of linear expansion from each other, and the plates 12 and 13 each have a larger coefficient of linear expansion than the ventilation duct 1a.

The punched plates 1 on both sides of the spacing piece 2 are firmly joined by superimposing the plates 12 and 13, and the plate 12 on the side of the ventilation duct 1a is made of, for example, rolled brass (coefficient of linear expansion). 2.0), and a rolled steel plate (coefficient of linear expansion: 1.
1) is used.

According to the configuration of the present embodiment, since the temperature of the surroundings is higher during the operation of the rotating electric machine due to heat generation than in the manufacturing of the punched plate, the punched plate 1 having the structure in which the plates 12 and 13 are joined together is used. Tends to thermally deform to the side opposite to the ventilation duct 1a due to the bimetal principle. By this action,
The deformation at the time of pressing the iron core also acts in the direction of returning the collapse of the ventilation duct 1a during operation, and can reduce the pressure loss of the cooling gas during operation.

Fourth Embodiment (FIGS. 7 to 10) FIGS. 7 to 10 illustrate a fourth embodiment of the present invention. These drawings show a spacing piece 2 forming a ventilation duct 1a of a stator core. And two punched plates 1 sandwiching this.

Also in this embodiment, the spacing piece 2 is fixed by welding to one of the two punched plates 1 sandwiching it. FIG. 7 shows a blank 1 to which a spacing piece 2 is welded.
FIG. 8 shows the blank 1 on the side not to be welded. FIG. 9 shows a state of the stator core viewed from the outer peripheral side of the ventilation duct, and FIG. 10 shows a state of the stator core viewed from the inner peripheral side.

In the present embodiment, warpages 14 and 1 are formed on the outer peripheral end and the inner peripheral end of the punched plate 1 on both sides of the spacing piece 2.
5 are provided. The position of these warps 14, 15;
The range and shape are indicated by broken lines in FIGS. 7 and 8, and by solid lines in FIGS. 9 and 10, respectively. That is, as shown in FIG. 7 and FIG. 9, on the outer peripheral end side (excluding the interval piece position) of the punched plate 1, the outer peripheral end of the punched plate 1 partially faces in the direction opposite to the ventilation duct 1 a. Deformation is given in advance to warp. Even if such a given deformation causes deformation such that the ventilation duct 1a is crushed by the pressing force at the time of pressing the iron core, the crushing is canceled out.

On the inner peripheral side of the stator core, as shown in FIGS. 8 and 10, the teeth 15 of the punched plate 1 on both sides of the spacing piece 2 A warp 15 is provided. The warp 15 has a shape in which the tip of the tooth portion 5 of the punched plate 1 warps in a direction opposite to the ventilation duct 1a. , And the collapse of the ventilation duct 1a can be canceled at the time of pressing the iron core as described above.

According to the present embodiment, the warpage 1
The provision of 4, 15 can prevent the ventilation duct from being crushed at the time of pressing the iron core.

Fifth Embodiment (FIGS . 11 and 12) FIGS. 11 and 12 illustrate a fifth embodiment of the present invention. FIG. 11 is a cross section perpendicular to the axis showing a ventilation duct of a stator core. FIG. 12 is a diagram showing a state where the ventilation duct is viewed from the outer peripheral side.

In this embodiment, as shown in these figures, in addition to the long interval pieces 2 extending from the inner peripheral side to the outer peripheral side of the iron core, or from the slot 10 of the punched plate 1 in which the stator coil 3 enters to the outer peripheral side, Is positioned between the respective spacing pieces 2 and substantially in parallel with the spacing pieces 2 on the outer peripheral side of the punched plate 1.
6 are provided.

According to the present embodiment having such a configuration, another space piece 16 is partially added to the outer peripheral side where the space between the space pieces 2 constituting the ventilation duct 1a is widened, so that the time required for iron core pressing can be reduced. The crush deformation of the ventilation duct 1a can be prevented.

Sixth Embodiment (FIGS . 13 and 14) FIGS. 13 and 14 illustrate a sixth embodiment of the present invention, and show a state in which a ventilation duct is viewed from, for example, the outer peripheral side. FIG. 13 shows one configuration example, and FIG. 14 shows another configuration example.

In one configuration example of the present embodiment, as shown in FIG. 13, an arc-shaped concave recess 17 which is gently curved is provided on both surfaces of the spacing piece 2 on the side of the punched plate 1. When the punched plate 1 is pressurized by the depressions 17 at the time of pressing the iron core, the ventilation duct 1a is deformed in a direction in which the ventilation duct 1a spreads, as indicated by a broken line.

In another configuration example, as shown in FIG. 14, the recess 18 of the spacing piece 2 has a concave shape with a rectangular cross section.
As shown by a broken line in FIG. 4, the air duct 1a is deformed in a direction in which it spreads.

According to this embodiment having such a configuration, it is possible to prevent the air duct from being crushed and deformed at the time of pressing the iron core.

Seventh Embodiment (FIGS. 15 to 17) This embodiment shows a method for manufacturing a stator core of a rotating electric machine. 15 to 17 are diagrams for explaining the method of the present embodiment. FIG. 15 shows a cross section perpendicular to the axis of the iron core ventilation duct, and FIG. 16 shows a state viewed from the outer peripheral side of the ventilation duct. Reference numeral 17 denotes a state viewed from the inner peripheral side.

As shown in these figures, when forming an iron core by laminating thin steel plates, the outer peripheral side spacer 19 and the inner peripheral side spacer 20 are inserted into the ventilation duct 1a from the outer peripheral side and the inner peripheral side, respectively. I do. These spacers 19, 20
Has the same thickness as the height of the ventilation duct 1a.

Therefore, at the time of pressing the iron core after laminating the blank 1, these spacers 19, 2 are formed in the ventilation duct portion.
0 will share the press load.

According to the method of this embodiment, it is possible to prevent the air duct 1a from being crushed and deformed by the action of inserting the spacer during the pressing operation.

These spacers 19 and 20 are removed after pressing the iron core.

Eighth Embodiment (FIGS. 18 and 19) This embodiment relates to a modification of the seventh embodiment, and FIG. 18 shows a state where the ventilation duct is viewed from the outer peripheral side, and FIG. This shows a state viewed from the inner peripheral side.

In this embodiment, FIG. 18 and FIG.
As shown in FIG. 9, the outer peripheral side spacer 21 and the inner peripheral side spacer 23 are inserted into the ventilation duct 1a from the outer peripheral side and the inner peripheral side, respectively, at the time of assembling the iron core. In this case, in the present embodiment, sheets 22 and 24 made of a polymer material such as Teflon are attached to both sides in the thickness direction of the spacers 21 and 23, respectively.

According to the method of this embodiment, the spacer 2
The fact that the air duct 1a is prevented from being crushed and deformed by the iron core press during the core pressing is the same as in the seventh embodiment,
Further, when removing the spacers 21 and 23 after pressing, the punched plate 1 is formed by the sheets 22 and 24 made of a polymer material.
And the spacers 21 and 23 can be easily removed.

FIG . 9 Embodiment (FIG. 20) FIG . 20 shows a ninth embodiment according to the present invention, and relates to a method of manufacturing a stator core of a rotating electric machine.

In this embodiment, a step of applying a wedge 25 to the ventilation duct 1a, which has been deformed after the core pressing, and hitting it with a hammer 26 or the like to insert the wedge 25 to correct the deformed deformation.

According to the method of this embodiment, although the number of manufacturing steps is slightly increased, the crushing deformation of the ventilation duct 1a can be surely corrected by inserting the wedge 25 by pressing force, tapping force or the like. .

[0072]

As described above in detail, according to the present invention, it is possible to prevent or correct the ventilation duct of the stator core of the rotating electric machine from being crushed and deformed during the pressing of the core in the manufacturing process. Therefore, the pressure loss when the cooling gas passes through the ventilation duct during operation can be greatly reduced, and as a rotating electric machine, the airflow of the cooling gas is increased to enhance the cooling of the stator coil and iron core, and the temperature is increased. Can be reduced. Further, when the cooling gas is circulated with the same air volume as the conventional one, the pressure of the fan can be reduced, and the efficiency of the rotating electric machine can be improved by reducing the fan power.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a stator core of a rotating electric machine according to a first embodiment of the present invention.

2A is an enlarged view showing a state where the stator core shown in FIG. 1 is viewed from an outer peripheral side, and FIG. 2B is a view showing a state where the stator core shown in FIG. 1 is viewed from an inner peripheral side; Enlarged view.

FIG. 3 is a configuration diagram showing a ventilation duct portion of a stator core according to a second embodiment of the present invention.

FIG. 4 is an enlarged view showing a blank plate of FIG. 3;

FIG. 5 is a configuration diagram showing a stator core according to a third embodiment of the present invention, showing a ventilation duct portion viewed from an outer peripheral side.

FIG. 6 is a configuration diagram showing a stator core according to a third embodiment of the present invention, showing a ventilation duct portion viewed from an inner peripheral side.

FIG. 7 is a configuration diagram showing, from a welding side, a spacing piece and a punched plate forming a ventilation duct of a stator core according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a spacing piece and a punched plate forming a ventilation duct of a stator core according to a fourth embodiment of the present invention from a non-welding side.

FIG. 9 is a configuration diagram of a blank plate forming a ventilation duct according to the embodiment, showing a state viewed from an outer peripheral side.

FIG. 10 is a configuration diagram of a punched plate forming a ventilation duct according to the embodiment, showing a state viewed from an inner peripheral side.

FIG. 11 is a configuration diagram showing a ventilation duct portion of a stator core according to a fifth embodiment of the present invention.

FIG. 12 is a diagram illustrating a state in which the ventilation duct illustrated in FIG. 11 is viewed from an outer peripheral side.

FIG. 13 is a view showing a sixth embodiment of the present invention and showing a spacing piece and its operation as viewed from an outer peripheral side.

FIG. 14 is a view showing a sixth embodiment of the present invention and showing a spacing piece and its operation as viewed from an inner peripheral side.

FIG. 15 is a configuration diagram illustrating a method of manufacturing a stator core according to a ninth embodiment of the present invention.

FIG. 16 is a diagram showing the stator core of FIG. 15 as viewed from the outer peripheral side.

FIG. 17 is a diagram showing the stator core of FIG. 15 as viewed from the inner peripheral side.

FIG. 18 is a view for explaining the method of manufacturing the stator core according to the eighth embodiment of the present invention, and is a view showing a state viewed from the outer peripheral side.

FIG. 19 is a diagram for explaining the method of manufacturing the stator core according to the eighth embodiment of the present invention, and is a diagram showing a state viewed from the inner peripheral side.

FIG. 20 is a diagram illustrating a method for manufacturing a stator core according to the ninth embodiment of the present invention.

FIG. 21 is a diagram illustrating a ventilation duct portion of a stator core of a rotating electric machine according to a conventional technique and its operation.

FIG. 22 is a diagram showing a state where the duct unit of FIG. 21 is viewed from the outer peripheral side.

FIG. 23 is a diagram showing a state where the duct portion of FIG. 21 is viewed from the inner peripheral side.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 punching plate 1 a ventilation duct 2 spacing piece 3 stator coil 4 wedge 5 teeth 7 punching plate 8 punching plate 9 cutout 10 slot 11 cutout 12 plate 13 plate 14 outer-side warp 15 inner-side warp 16 interval piece 17 recess 18 recess 19 outer peripheral side spacer 20 inner peripheral side spacer 21 outer peripheral side spacer 22 sheet 23 inner peripheral side spacer 24 sheet 25 wedge 26 hammer

Claims (11)

[Claims] A stator core is formed by stacking a plurality of punched plates formed from a thin steel plate, and a plurality of ventilation ducts are formed at intervals in a part of the stator core in the stacking direction of the punched plates. In the stator of a rotating electrical machine, the ventilation duct is formed by a gap formed by inserting a spacing piece between the stacked punched plates, the draft on the side facing the inside of the ventilation duct facing the spacing piece. A stator for a rotating electric machine, wherein a thickness of a plate is larger than that of another punched plate directly stacked. 2. The stator of a rotating electric machine according to claim 1, wherein a portion between two adjacent ones of the blanks on either side or one side of the blank plate facing each other with the spacers interposed therebetween is arranged from the outer peripheral end side to the inner periphery. A stator for a rotating electrical machine, wherein a notch formed by removing a certain area toward a side is formed. 3. The stator for a rotating electrical machine according to claim 1, wherein the inner peripheral end located on the teeth side of the opposite side or one side of the cutout plate with the spacing piece interposed therebetween faces from the spacing piece to the slot. A stator for a rotating electrical machine, wherein a notch is formed by removing a certain area from the stator. 4. The stator for a rotating electrical machine according to claim 1, wherein the punched plate on both sides or one side sandwiching the spacing piece and the punched plate adjacent thereto are formed by punched plates made of materials having different linear expansion coefficients. The fixing of the rotating electric machine, wherein the cut-out plate facing to the one side of the interval is formed of a material having a larger coefficient of linear expansion than the adjacent cut-out plate among the two cut-out plates joined together. Child. 5. A warp curving in a direction opposite to a ventilation duct side in a stator of a rotating electric machine according to claim 1, wherein a part of an outer peripheral end side of one or both sides of a punched plate opposed to each other with a spacing piece interposed therebetween. A stator for a rotating electric machine, wherein iron cores are laminated using a punched plate provided with a core. 6. The stator for a rotating electrical machine according to claim 1, wherein the tip of a tooth portion of a punched plate on both sides or one side facing the space piece is curved toward the space piece and the opposite side. A stator for a rotating electric machine, wherein iron cores are laminated using a punched plate provided with a warp. 7. A stator core constituted by stacking a plurality of punched plates formed from a thin steel plate, and a plurality of ventilation ducts are formed at intervals in a part of the stator core in the stacking direction of the punched plates. In the stator of the rotating electrical machine formed by a gap formed by inserting a spacing piece between the punched plates, the ventilation duct is shorter than the spacing piece in addition to the spacing piece forming the ventilation duct portion. A stator for a rotating electric machine, wherein a spacing piece is inserted into an outer peripheral end side of the blanking plate. 8. A stator core constituted by stacking a plurality of punched plates formed from a thin steel plate, and a plurality of ventilation ducts are formed at intervals in a part of the stator core in the stacking direction of the punched plates. In the stator of the rotating electric machine, which is formed by a gap formed by inserting a spacing piece between the punched plates to be stacked, the ventilation duct is provided with a depression on the punched plate joining side of the spacing piece forming the ventilation duct portion. A stator for a rotating electric machine, wherein a stator core is formed using the spacing pieces. 9. A stator core formed by stacking a plurality of punched plates formed from a thin steel plate, wherein a plurality of ventilation ducts are formed at intervals in a part of the stator core in the stacking direction of the punched plates. In the method for manufacturing a stator of a rotating electric machine, the ventilation duct is formed by a gap formed by inserting a spacing piece between the punched plates to be stacked, at least one of an inner peripheral side and an outer peripheral side of the ventilation duct is provided. A method for manufacturing a stator for a rotating electric machine, comprising: inserting a spacer having the same thickness as the width of a ventilation duct into such a portion; and applying a press load to an iron core. 10. The method for manufacturing a stator of a rotating electric machine according to claim 9, wherein the spacer sandwiches a sheet-shaped member on both sides in the width direction of the ventilation duct. Production method. 11. A stator core constituted by stacking a plurality of punched plates formed from a thin steel plate, wherein a plurality of ventilation ducts are formed at intervals in a part of the stator core in the stacking direction of the punched plates. In the method of manufacturing a stator of a rotating electric machine, the ventilation duct is formed by a gap formed by inserting a spacing piece between the punched plates to be stacked. Of the stator of the rotating electric machine, characterized in that by applying a pressing force or a hitting force or both forces to the jig, the deformation on the inner circumferential side or the outer circumferential side of the ventilation duct is corrected. Production method.