JPH0767272A - Stator structure for synchronous machine, manufacture thereof and its tooth piece - Google Patents

Abstract

PURPOSE:To reduce iron loss by employing an oriented electromagnetic steel plate in place of a non-oriented electromagnetic steel plate in a stator formed by laminating electromagnetic steel plates and to facilitate manufacture of the stator structure. CONSTITUTION:Yokes and teeth constituting a stator are split and the yoke is further split in the peripheral direction. The yoke pieces 20, 21 and the pieces 22, 23 are formed of an oriented electromagnetic steel plate such that the yoke pieces 20, 21 have easy direction of magnetization in the peripheral direction and the teeth pieces 22, 23 have easy direction of magnetization in the radial direction. The yoke pieces and the teeth pieces are jointed alternately in the laminating direction. Consequently, the direction of flux in the yoke pieces 20, 21 and teeth pieces 22, 23 is aligned with the easy direction of magnetization of oriented electromagnetic steel plate and thereby the iron loss is reduced and the efficiency of a motor 40 is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator structure of a synchronous machine, a method of manufacturing the stator structure, and a tooth piece and a yoke piece used for the stator, and more particularly to a technique of using a grain-oriented electrical steel sheet for the stator of the synchronous machine.

[0002]

2. Description of the Related Art Conventionally, a stator of a synchronous machine of this type, for example, a three-phase synchronous motor is constructed by laminating thin electromagnetic steel plates in the axial direction of a rotary shaft. The steel sheets to be laminated have an insulating layer and an adhesive layer formed on the surface, and are laminated and fixed by heating and melting the adhesive layer after assembly. As an example of such a synchronous machine, a "variable reluctance motor" disclosed in Japanese Patent Laid-Open No. 2-119561 is known.

As a material for such a stator, a non-oriented electrical steel sheet is usually used. This is for the following reason. Considering the magnetic flux formed on the stator side, the magnetic flux is in the radial direction of the motor at the tooth portion and is in the rotating direction at the yoke portion. As described above, the magnetic flux directions of the teeth and the yoke are different by almost 90 degrees, and even when the adjacent teeth are compared with each other, the magnetic flux directions of the respective teeth are different by the central angle between the teeth. In an attempt to reduce iron loss as a whole in a stator having different magnetic flux directions, it is preferable to use a non-oriented electrical steel sheet instead of a grain-oriented electrical steel sheet having a direction in which magnetization is easy.

[0004]

Improvement of efficiency of a synchronous machine,
For example, in order to increase the output torque and reduce the size of a three-phase synchronous motor, it is necessary to further reduce iron loss in the teeth and yokes. It was difficult to further reduce By the way, focusing on the teeth, for example, since the direction of the magnetic flux is limited to the radial direction, it is clear that the core loss can be considerably reduced if the grain-oriented electrical steel sheet can be used so that the radial direction is the direction of easy magnetization. These problems are not limited to synchronous motors, but are common to synchronous machines such as synchronous generators.

The stator structure of the synchronous machine of the present invention has been made in view of these points, and an object thereof is to further improve the efficiency of the synchronous machine. Further, the stator manufacturing method of the present invention relates to such a stator structure manufacturing method, and further, the tooth piece and the yoke piece of the present invention are
A member suitable for realizing such an object is provided.
It has the following structure.

[0006]

A first structure of a synchronous machine according to the present invention is a synchronous structure in which a plurality of stators having teeth around which a stator coil is wound are laminated and fixed in the thickness direction. In a stator structure of a machine, at least the teeth and the yoke are separated, at least the teeth are formed of a grain-oriented electrical steel sheet, and the easy-magnetization direction of the grain-oriented electrical steel sheet is a radial direction. To do.

Further, the stator structure of the second synchronous machine is a stator structure of a synchronous machine in which a plurality of stators having teeth around which a stator coil is wound are stacked and fixed in the thickness direction. At least the teeth and the yoke are separated from each other, the yoke is divided into a plurality in the circumferential direction, at least the yoke is formed of a grain-oriented electrical steel sheet, and the easy-magnetization direction of the grain-oriented electrical steel sheet is set to each of the yokes. The gist is that it is in the circumferential direction.

According to a first method of manufacturing a stator of a synchronous machine of the present invention, a yoke and a tooth constituting a stator of the synchronous machine are separately formed, and at least the tooth has a directional electromagnetic field having an insulating layer on its surface. The direction of easy magnetization is formed by the steel plate as the radial direction of the synchronous machine, and the teeth and the yoke are fitted into the assembly jig having the recess having the cross-sectional shape of the stator, and this is repeated in the rotational axis direction of the synchronous machine. The essential point is to stack the teeth and the yoke and fix the stacked teeth and the yoke.

According to a second method of manufacturing a stator of a synchronous machine, a yoke and a tooth constituting the stator of the synchronous machine are separately formed, and at least the yoke is further divided into a plurality of pieces in the radial direction. The yoke is formed of a grain-oriented electrical steel sheet having an insulating layer, the direction of easy magnetization is formed as the rotation direction of the synchronous machine, and the teeth and the yoke are fitted into an assembly jig having a recess having a cross-sectional shape of the stator,
The gist of the invention is to repeat this in the direction of the rotation axis of the synchronous machine to stack the teeth and the yoke, and to fix the stacked teeth and the yoke.

A tooth piece of the present invention used for a stator of a synchronous machine is formed of a grain-oriented electrical steel sheet having an insulating layer on its surface, has an assembly portion with a yoke at an end different from the tip, and the electromagnetic steel sheet. The gist is that the easy magnetization direction is from the tip to the assembly part.

On the other hand, the yoke piece of the present invention used for a stator of a synchronous machine has a shape in which a ring-shaped yoke is divided into a plurality of parts, has an assembly portion with teeth on the inner peripheral side, and has an insulating layer on the surface. With the grain-oriented electrical steel sheet,
The gist is that the direction of easy magnetization of the electromagnetic steel sheet is formed in the circumferential direction.

[0012]

In the stator structure of the first synchronous machine of the present invention configured as described above, at least the teeth of the separate teeth and yoke are formed of grain-oriented electrical steel sheets, and the grain-oriented electrical steel sheets are used. Since the easy magnetization direction is set to the radial direction, the iron loss in the teeth is greatly reduced as compared with the case where the iron loss is formed of a non-oriented electrical steel sheet.

Further, in the stator structure of the second synchronous machine of the present invention, at least the yoke and the yoke, which are separate bodies, are further divided in the circumferential direction and are formed by the grain-oriented electrical steel sheet. Moreover, since the direction of easy magnetization of the grain-oriented electrical steel sheet is the circumferential direction, the iron loss in the yoke is greatly reduced compared to the case where it is formed of the non-oriented electrical steel sheet.

Here, the shape and the arrangement of the teeth and / or the yokes are set so that the connection points between the teeth and the yokes and / or the connection points between the yokes are different from those connection points that are adjacent in the motor axial direction. It is also preferable to make either of the combinations different in order to reduce the loss at the connection point. Furthermore, it is effective that the teeth have an end portion on the side of connection with the yoke that projects outward, in order to increase the magnetic flux density at the connection point and reduce iron loss.

On the other hand, according to the first and second stator manufacturing methods of the present invention, it is possible to easily manufacture the stator having the structure in which the teeth or the yoke are divided and the iron loss in the teeth or the yoke is reduced. .

Further, according to the tooth piece of the present invention having the assembly part with the yoke at the end different from the tip, the direction of easy magnetization in the grain-oriented electrical steel sheet is from the tip to the assembly part. However, when this is used in a synchronous machine, its iron loss is reduced. Similarly, according to the yoke piece of the present invention having a shape in which the ring-shaped yoke is divided into a plurality, the easy magnetization direction in the grain-oriented electrical steel sheet is the circumferential direction of each yoke, and When used for
The iron loss is reduced.

[0017]

Preferred embodiments of the present invention will be described below in order to further clarify the structure and operation of the present invention described above. FIG. 1 shows a stator 30 as an embodiment of the present invention.
2 is a plan view showing the structure of FIG. 2 together with the rotor 50, and FIG. 2 is a sectional view showing the structure of a three-phase synchronous motor 40 incorporating the stator 30.

First, referring to FIG. 2, a three-phase synchronous motor 40
The overall structure of will be described. This three-phase synchronous motor 40
Is composed of a stator 30, a rotor 50, and a case 60 that houses them. The rotor 50 has permanent magnets 51 to 54 attached to the outer periphery thereof, and a rotating shaft 55 provided at the center of the rotor is rotatably supported by bearings 61 and 62 provided in a case 60. The stator 30 includes 12 teeth, and a stator coil 32 wound around the teeth. The detailed configuration of the stator 30 will be described later.

The rotor 50 is formed by laminating a plurality of rotors 57 formed by punching out non-oriented electrical steel sheets.
As shown in the drawing, the rotor 57 has four
The salient poles 71 to 74 are provided at the locations. Each rotor 57
Using a jig that is accurately formed in the same size and shape and that is positioned by the outer shape of the salient poles 71 to 74,
The salient poles 71 to 74 are laminated so as to be aligned in the axial direction of the rotating shaft 55. After the lamination, the rotary shaft 55 is press-fitted to temporarily fix the laminated rotor 57. An insulating layer and an adhesive layer are formed on the surface of the rotor 57 made of this electromagnetic steel sheet, and the laminated layer is heated to a predetermined temperature to melt and fix the adhesive layer.

After the rotor 50 is formed in this manner, four permanent magnets 51 to 54 are axially attached to the outer peripheral surface of the rotor 50 at intermediate positions of the salient poles 71 to 74. It This permanent magnet is magnetized in the thickness direction. When the rotor 50 is assembled to the stator 30, the permanent magnets 51 to 54 form a magnetic path that penetrates the adjacent permanent magnets 51 to 54, the rotor 57, and the stator. The synchronous motor using the permanent magnet rotates the rotor by the interaction between the magnetic flux generated by the permanent magnet and the magnetic flux generated by the alternating current flowing through the stator coil 32, but its operating principle is known. The description here is omitted.

The structure of the stator 30 will be described with reference to FIGS. 1, 3 and 4. FIG. 3 is a plan view showing a state in which one stator and teeth at the ends of the laminated stator 30 are removed. That is, FIGS. 1 and 3 show the shapes of the stator and the teeth that are adjacent to each other in the axial direction. FIG. 4 is an end view of 4-4 in FIG.

The stator 30 has two types of yoke pieces 2 each.
It is composed of 0, 21 and teeth pieces 22, 23. As shown in FIG. 5, the yoke pieces 20 and 21 and the teeth pieces 22 and 23 have slightly different shapes.
Is a connecting portion 2 with a central angle of θa and with which the tooth piece 22 is fitted.
The depth of 0a is Da. On the other hand, in the yoke piece 21, the central angle is θb and the depth of the connecting portion 20b is Db. Teeth pieces 22, 23 fitted to these yoke pieces 20, 21
Has a radial length of Ta and Tb, respectively.

Since there are 12 teeth at the central angles θa and θb of the yoke pieces 20 and 21, the relationship of θa + θb = 360/6 is established. Also, the teeth pieces 22, 23
Of the length Ta, Tb of the yoke pieces 20, 21
The relationship of Ta-Da = Tb-Db is established between a and Db.

Therefore, by alternately repeating the yoke pieces 20 and 21, the peripheral portion (360 degrees) of the stator 30 is formed by 6 sets and 12 pieces of the yoke pieces 20 and 21. on the other hand,
6 sets 1 arranged alternately according to the yoke pieces 20 and 21
The teeth of the stator 30 are formed by the two teeth pieces 22 and 23. The positions of the inner peripheral side end portions of the teeth pieces 22 and 23 are the same with respect to the outer periphery of the rotor 50. The combination of the yoke piece 20 and the teeth piece 22 is shown in FIG.
The combination of the yoke piece 21 and the teeth piece 23 is shown in FIG. 6 (B).
, Respectively.

Unlike the rotor 57, a grain-oriented electrical steel sheet is used for the yoke pieces 20 and 21 and the teeth pieces 22 and 23. The direction of easy magnetization of the grain-oriented electrical steel sheet is as shown by arrows X and Y in FIG.
In the case of 0, 21, the circumferential direction, the teeth pieces 22, 2
In No. 3, it is in the radial direction. Therefore, as shown in FIG. 1, when the magnetic fluxes from the permanent magnets 51 and 52 are taken as an example, in the yoke pieces 20 and 21 and the teeth pieces 22 and 23, the direction of the magnetic field coincides with the easy direction of magnetization in the electromagnetic steel sheet. ing.

The stator 30 is formed by laminating a plurality of yoke pieces 20 and 21 and teeth pieces 22 and 23 formed by punching out the above-mentioned grain-oriented electrical steel sheet. Moreover, as shown in FIGS. 1 and 3, the combination of the yoke piece 20 and the tooth piece 22 and the yoke piece 21 and the tooth piece 2 are combined.
The combination of 3 is arranged alternately also in the stacking direction. An insulating layer and an adhesive layer are formed on the surface of these grain-oriented electrical steel sheets, and after lamination, they are heated to a predetermined temperature to melt and fix the adhesive layer. As a result, as shown in FIG. 4, the yoke pieces 20, 21 and the teeth pieces 22, 23 are formed.
The connection positions with and are adjacent to each other in the stacking direction. Although not shown in particular, the yoke pieces 20, 2
Since 1 also has a different width (center angle) in the circumferential direction, the connection positions of the yoke pieces 20 and 21 adjacent to each other in the stacking direction are also staggered.

For the magnetic flux formed by the permanent magnets 51 to 54, the yoke pieces 20, 21 and the teeth pieces 22,
It is considered that the connection by abutting with 23 lowers the magnetic permeability as compared with the one having an integral structure even if both are closely attached. However, the decrease in iron loss due to the use of the grain-oriented electrical steel sheet more than compensates for the loss in the connection portion. Further, as in the present embodiment, if the connecting portions of the electromagnetic steel sheets are staggered between adjacent ones, the magnetic flux is formed at a portion relatively close to the surface of the electromagnetic steel sheet. The loss due to the connection with the tooth pieces 22 and 23 and the loss due to the connection between the yoke pieces 20 and 21 hardly occur. Therefore, if a grain-oriented electrical steel sheet is adopted and the easy direction of magnetization of the material is aligned with the direction of the magnetic field by the permanent magnets 51 to 54 by the yoke pieces and the teeth pieces, the iron loss decreases by several tens of percent, This can be directly converted to improve the efficiency of the synchronous motor 40.

As a result, the three-phase synchronous motor 40 having such a structure has improved efficiency, and the output torque increases with the same shape. Further, if the same output torque is obtained, the shape can be made smaller, and power saving can be achieved. Therefore, it is possible to improve the performance (distance traveled, maximum load capacity, maximum speed, etc.) of a device equipped with the three-phase synchronous motor 40, such as an electric vehicle.

When the stator 30 is composed of the yoke pieces 20 and 21 and the teeth pieces 22 and 23 as in the present embodiment, it is not necessary to punch the stator at one time using a large mold, and the stator can be used for several minutes. One size mold can be used. As a result, there are advantages such as a reduction in die cost and an improvement in yield due to the reduction of the area of the magnetic steel sheet that cannot be used due to punching.

The yoke pieces 20 and 21 and the tooth piece 2
Various variations can be considered for the shapes of 2, 23. For example, as shown in FIG. 7, it is also preferable to make the ends of the teeth piece 122 on the side of the yoke piece 120 sharp so as to facilitate the formation of magnetic flux from the teeth to the yoke.
In this case, the angle of the tip of the tooth piece 122 is preferably about 90 degrees.

Further, as shown in FIG.
Even if the end portion of 2 is formed by a curved line that bulges outward, the same effect is obtained. Furthermore, if the widthwise convex portions 132a are provided at both ends of the tooth piece 132 and the fitting portion of the yoke piece 130 is formed in a corresponding shape, the connection with the yoke piece 130 is less likely to be lost, and the stator. It is suitable as the structure.

In the above embodiment, two types of yoke pieces and teeth pieces are combined in order to make the positions of connection between the yoke pieces and the teeth pieces different between the adjacent pieces in the stacking direction. As shown, if the yoke pieces 140 and the teeth pieces 142 are left-right asymmetrical and alternately combined on the front and back, at least the teeth pieces 142 of the same type can be used. If it is desired to shift the joining positions of the yoke pieces 140, two types of yoke pieces, that is, a wide yoke piece and a narrow yoke piece, are required. However, as shown in FIG. If the offset yoke pieces 150 are used, only one type can be used. This is because if the yoke pieces 150 are alternately stacked on the front and back sides, the yoke pieces adjacent to each other in the stacking direction shift and overlap, as shown by the broken line in FIG. Needless to say, if the tooth pieces 152 are left-right asymmetric, only one type of tooth piece is sufficient.

Next, a second embodiment of the present invention will be described. As shown in FIG. 11, the stator 230 of the second embodiment has a yoke portion 2 formed by punching out a non-oriented electrical steel sheet.
20 and twelve teeth pieces 222 and 223 assembled to the yoke portion. Teeth piece 2
22 and 223 are formed by punching a grain-oriented electrical steel sheet with a press and have the same shape as the tooth pieces 22 and 23 of the first embodiment (see FIG. 5). It is also the same as the first embodiment in that the easy direction of magnetization of the electromagnetic steel sheet coincides with the radial direction of the tooth.

The yoke portion 220 includes the tooth pieces 222, 2
Corresponding to the difference in the length in the radial direction of 23, a connecting portion having a different depth is provided, and the tooth pieces 222 and 223 are fitted therein.
It is assembled. In the stacking direction, the yoke portion 220 and the tooth pieces 222 and 223 have a relationship in which adjacent ones are displaced from each other by 30 degrees in the rotation direction.
That is, focusing on one tooth, the tooth pieces 222 and the tooth pieces 223 are alternately stacked. In addition, the yoke portion 220, the tooth pieces 222, 223
The stacking method is also the same as in the first embodiment.

According to this embodiment, the iron loss in the teeth is reduced by several tens of percent as compared with the case where the teeth are made of the non-oriented electrical steel sheet, and the iron loss on the stator side is reduced as a whole. Further, as in the first embodiment, the tooth pieces and the yoke portions are connected alternately with each other in the stacking direction, and the loss at the connection points is suppressed to be small. In the present embodiment, there is an advantage that only one type of yoke portion 220 is required. In addition, the yoke portion 220
Is annular, it is easy to secure the strength of the stator 230.

Next, as another embodiment of the present invention, a method of manufacturing a stator will be described. 12 and 13 are explanatory views showing the structure of a jig for assembling the stators 30 and 230 of the above-mentioned several embodiments. FIG. 12 shows the upper jig 300.
And an axial end view of the lower jig 350. FIG.
It is a top view of 0. Note that the left half of FIG. 13 is not shown in detail because it is symmetrical.

In this lower jig 350, a ring-shaped outer peripheral member 320 and a central member 330 are concentrically fixed to the base 310 by screws from the bottom surface.
Twelve positioning members 340 are arranged and fixed between 330 at intervals of 30 degrees with respect to the center of the jig. As a result,
The lower jig 350 has a shape in which the hatched portion in FIG. 13 remains as a recess.

In order to assemble the stator 30 of the first embodiment, first the teeth piece 22, the tooth piece 22,
6 sets 12 of 23 for one layer are fitted, and then the yoke pieces 20 and 21 corresponding thereto are fitted. This completes one layer,
Then, the teeth pieces 22 and 23 are fitted so that they are staggered from the teeth pieces 22 and 23 that have already been fitted. Then, the yoke pieces 20 and 21 are fitted. By alternately performing this step, the yoke pieces 20 and 21 and the teeth pieces 22 and 23 sufficient to form the stator 30 are laminated. This state is shown in FIG.

On the other hand, the upper jig 300 has an upper base 370 connected to a pressing mechanism (not shown) via an arm 360.
Further, the pressurizing unit 380 is fixed by screws. The pressing portion 380 has a shape corresponding to the recess of the lower jig 350, and can be fitted into the recess with a predetermined clearance.

After fitting a predetermined number of layers of the yoke pieces 20 and 21 and the teeth pieces 22 and 23 in the recesses, the entire lower jig 350 is heated to a predetermined temperature to melt the adhesive layer laminated on the surface of the electromagnetic steel sheet. And From this state, the upper jig 300
To the lower jig 350, and the tip of the pressurizing section 380 has the stacked yoke pieces 20, 21, the teeth pieces 22,
After contacting 23, it is pressurized. In this state, the temperature of the entire lower jig 350 is lowered and the yoke piece 2
0, 21 and teeth pieces 22, 23 are fixed to each other. After that, this is assembled to the three-phase synchronous motor 40 as the stator 30.

According to the manufacturing method described above, the stator 30 using the grain-oriented electrical steel sheet can be easily manufactured. In particular, in the stator 30 in which the yoke and the teeth are divided, it is possible to obtain an advantage that many pieces can be easily stacked. In addition, with the same jig,
The stator 230 of the second embodiment shown in FIG. 11 can be manufactured.

The embodiment of the present invention has been described above.
The present invention is not limited to such an embodiment. For example, the number of slots per pole is not 3 and 4
The configuration of the number of poles other than the pole, the configuration applied to the synchronous generator, etc.
Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.

[0043]

As described above, the first and second aspects of the present invention
In the stator structure of the synchronous machine, since grain-oriented electrical steel sheets can be used for the teeth or the yoke, its iron loss can be significantly reduced compared to the conventional one using non-oriented electrical steel sheets. Produce the effect. Furthermore, if any one of the shapes and arrangements of the teeth and the yokes is made different so that the positions of the connecting points are different between the adjoining ones in the stacking direction, it is caused by the connection between the yokes and the teeth or between the yokes. This is more preferable because the problem of increased iron loss can be avoided.

According to the first and second methods of manufacturing a stator of a synchronous machine of the present invention, a stator having a divided tooth or yoke structure and having reduced iron loss in the tooth or yoke can be easily manufactured. It has an excellent effect that it can. Further, according to the tooth piece of the present invention, the easy magnetization direction coincides with the direction of the magnetic field, so that the iron loss when incorporated in a synchronous machine is reduced. Similarly, the iron loss of the yoke piece of the present invention is also reduced.

Therefore, if a synchronous motor or a synchronous generator is manufactured as a synchronous machine to which these inventions are applied, the outer diameter of the stator can be reduced without deteriorating the performance of the synchronous motor or the synchronous generator. Has an extremely excellent effect. As a result, it is possible to reduce the outer diameter shape and weight of the synchronous motor and the synchronous generator, and it is possible to reduce the size and weight of the motor and the like. Further, it also contributes to the improvement of the performance of equipment incorporating the motor or the like, such as an electric vehicle.

[Brief description of drawings]

FIG. 1 is a three-phase synchronous motor 40 according to an embodiment of the present invention.
It is a front view which shows the structure of the stator 30 of FIG.

FIG. 2 is a sectional view showing the structure of a three-phase synchronous motor 40 incorporating the stator 30 of the embodiment.

FIG. 3 is an explanatory diagram showing a structure of adjacent layers of a laminated stator 30.

FIG. 4 is an end view of 4-4 in FIG.

FIG. 5 is a plan view showing the shapes of the yoke pieces 20 and 21 and the tooth pieces 22 and 23 in the embodiment.

FIG. 6 shows a yoke piece 20, a tooth piece 22, and a yoke piece 21.
It is a perspective view which shows the structure which combined the teeth piece 23.

FIG. 7 is an explanatory diagram showing a modified example of the yoke piece and the tooth piece in the embodiment.

FIG. 8 is an explanatory diagram showing another modification of the yoke piece and the teeth piece in the embodiment.

FIG. 9 is an explanatory view showing a shape in the case where only one type of tooth piece is required.

FIG. 10 is an explanatory view showing a shape when only one type of yoke piece is required.

FIG. 11 is a plan view showing the configuration of a stator 230 of the second embodiment.

FIG. 12 is a schematic configuration diagram showing a structure of a jig used in the manufacturing method of the present invention.

FIG. 13 is a plan view of the lower jig 350 of the same.

[Explanation of symbols]

 20, 21 ... Yoke piece 20a ... Connection portion 20b ... Connection portion 22, 23 ... Teeth piece 30, 230 ... Stator 32 ... Stator coil 40 ... Three-phase synchronous motor 50 ... Rotor 51 or 54 ... Permanent magnet 55 ... Rotation Shaft 57 ... Rotor 60 ... Case 61, 62 ... Bearings 71 to 74 ... Salient poles 120, 130, 140, 150 ... Yoke pieces 122, 132, 142, 152 ... Teeth piece 132a ... Projection 220 ... Yoke section 222, 223 ... Teeth piece 230 ... Stator 300 ... Upper jig 310 ... Base 320 ... Outer peripheral member 330 ... Central member 340 ... Member 350 ... Lower jig 360 ... Arm 370 ... Upper base 380 ... Pressurizing section

Claims (8)

[Claims] 1. A stator structure for a synchronous machine, comprising a plurality of stators having teeth around which a stator coil is wound, laminated and fixed in the thickness direction, wherein at least the teeth and the yoke are separate bodies. And a stator structure of a synchronous machine in which at least the teeth are formed of a grain-oriented electrical steel sheet and the direction of easy magnetization of the grain-oriented electrical steel sheet is a radial direction. 2. A stator structure of a synchronous machine, comprising a plurality of stators having teeth around which a stator coil is wound, laminated and fixed in the thickness direction, wherein at least the teeth and the yoke are separate bodies. In addition, the yoke is divided into a plurality of portions in the circumferential direction, at least the yoke is formed of a grain-oriented electrical steel sheet, and the stator of the synchronous machine is such that the direction of easy magnetization of the grain-oriented electrical steel sheet is the circumferential direction of each yoke. Construction. 3. The stator structure for a synchronous machine according to claim 1, wherein a connection point between the teeth and the yoke and / or a connection point between the yokes is different from those connection points adjacent to each other in the stacking direction. A stator structure of a synchronous machine in which the shape, arrangement, and combination of the teeth and / or yokes are changed so that they are positioned. 4. The stator structure for a synchronous machine according to claim 1, wherein the teeth have a shape in which an end portion on a side connected to the yoke projects outward. 5. A yoke and a tooth constituting a stator of a synchronous machine are separately formed, and at least the tooth is made of a grain-oriented electrical steel sheet having an insulating layer on its surface so that its easy magnetization direction is in the radial direction of the synchronous machine. As an assembly jig with a recess having the cross-sectional shape of the stator,
A method for manufacturing a stator of a synchronous machine, in which the teeth and the yoke are fitted, and the teeth and the yoke are laminated by repeating this in the rotation axis direction of the synchronous machine, and the laminated teeth and the yoke are fixed. 6. A yoke and a tooth constituting a stator of a synchronous machine are separately formed, and at least the yoke is further divided into a plurality of pieces in the radial direction, and the yoke is made of a grain-oriented electrical steel sheet having an insulating layer. , An easy-to-magnetize direction is formed as the rotating direction of the synchronous machine, and an assembly jig with a recess having the cross-sectional shape of the stator
A method for manufacturing a stator of a synchronous machine, in which the teeth and the yoke are fitted, and the teeth and the yoke are laminated by repeating this in the rotation axis direction of the synchronous machine, and the laminated teeth and the yoke are fixed. 7. A tooth piece used for a stator of a synchronous machine, the tooth piece being formed of a grain-oriented electrical steel sheet having an insulating layer on a surface thereof, having an assembly portion with a yoke at an end portion different from a tip end, A tooth piece in which the direction of easy magnetization of the steel sheet is from the tip to the assembly portion. 8. A yoke piece used for a stator of a synchronous machine, which has a shape obtained by dividing a ring-shaped yoke into a plurality of pieces, has an assembly portion with teeth on the inner peripheral side, and has an insulating layer on the surface. A yoke piece formed of a grain-oriented electrical steel sheet, wherein the direction of easy magnetization of the electrical steel sheet is the circumferential direction.