JP3137510B2 - Stator for synchronous machine, method of manufacturing the same, teeth piece and yoke piece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, this type of synchronous machine, for example, a stator of a three-phase synchronous motor, is constructed by laminating thin electromagnetic steel plates in the axial direction of a rotating shaft. The laminated steel sheet has an insulating layer and an adhesive layer formed on the surface, and is 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 Application Laid-Open No. 2-119561 is known.

[0003] As a material for such a stator, a non-oriented electrical steel sheet is usually employed. 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 teeth and is in the rotational direction at the yoke. As described above, the direction of the magnetic flux differs between the teeth and the yoke by almost 90 degrees, and even when adjacent teeth are compared, the direction of the magnetic flux differs for each tooth by the central angle between the teeth. In order to reduce the iron loss as a whole in a stator in which the directions of magnetic fluxes are different, it is not possible to use a grain-oriented electrical steel sheet having a direction in which magnetization is easy, and it is desirable to use a non-oriented electrical steel sheet.

[0004]

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

The stator of the synchronous machine according to the present invention has been made in view of these points, and has as its object to further improve the efficiency of the synchronous machine. Further, the method for manufacturing the stator according to the present invention relates to the method for manufacturing such a stator , and the teeth piece and the yoke piece according to the present invention provide members suitable for realizing such an object. It has the following configuration.

[0006]

A stator of a synchronous machine according to the present invention uses a plurality of stators having teeth around which stator coils are wound, stacked and fixed in the thickness direction. Synchronous machine
A stator, and separately at least the teeth and the yoke, the tooth width direction of the end portion of the connection side of the yoke of the teeth project radially outwardly of the teeth and projecting unloading the tooth The gist of the present invention is that the magnetic steel sheet is formed of a grain-oriented electrical steel sheet having a gradually reduced shape, and the direction of easy magnetization of the grain-oriented electrical steel sheet is a radial direction.

[0007] In particular, the stator of the synchronous machine according to the present invention is arranged such that the connection between the teeth and the yoke and / or the connection between the yokes are different from those adjacent to each other in the stacking direction. Preferably, any one of the shape, arrangement, and combination of the yokes is different. Furthermore, it is preferable that the shape of the tooth protruding outward from the end on the connection side with the yoke is a substantially isosceles triangle or an arc-like symmetrical shape, or a left-right asymmetrical shape.

[0008] manufacturing process of the stator of the synchronous machine of the present invention forms a yoke and the teeth constituting the stator of the synchronous machine separately, at least the teeth, the teeth of the end of the connecting side of the yoke The direction of easy magnetization is formed as the radial direction of the synchronous machine by a grain-oriented electrical steel sheet having a shape that is projected outward in the radial direction of the teeth and has a shape in which the projection is gradually reduced in the width direction of the teeth and has an insulating layer on the surface. The teeth and the yoke are fitted into an assembling jig having a concave portion having a cross-sectional shape, and the teeth and the yoke are laminated by repeating this in the rotation axis direction of the synchronous machine. The point is to fix it.

In particular, this manufacturing method, together with at least the yoke between the connection points are divided into a plurality in the circumferential direction so that a position different from those connection points that are adjacent in the stacking direction, insulating the yoke The teeth and the yoke are fitted into an assembly jig having a recess having a cross-sectional shape of a stator by forming the direction of easy magnetization as a rotation direction of the synchronous machine by using a directional electromagnetic steel sheet having a layer. It is preferable that the teeth and the yoke are repeatedly laminated in the direction of the rotation axis, and the laminated teeth and the yoke are fixed.

[0010] The tooth piece of the present invention used for the stator of the synchronous machine is formed of a grain-oriented electrical steel sheet having an insulating layer on the surface, and has an end different from the tip on the connection side with the yoke.
Ends project radially outward of the teeth and
The gist of the present invention is to have an assembling part having a shape gradually reduced in the width direction of the teeth, and that the direction of easy magnetization of the magnetic steel sheet is a direction from the tip to the assembling part.

On the other hand, the yoke piece of the present invention used for the stator of the synchronous machine has a circumferential direction such that the connection point between the ring-shaped yokes is different from those connection points adjacent in the laminating direction. It has a plurality of divided shapes, and has an assembling portion with a tooth having a shape in which the end on the connection side with the yoke projects radially outward of the tooth on the inner peripheral side and the projection is gradually reduced in the width direction of the tooth. In addition, the gist of the present invention is that the direction of easy magnetization of the magnetic steel sheet is formed as a circumferential direction by a grain-oriented magnetic steel sheet having an insulating layer on a surface.

[0012]

In the stator of the present invention configured as described above,
Of the separate teeth and yokes, a grain-oriented electrical steel sheet having a shape in which the end of the teeth on the connection side with the yoke protrudes radially outward of the teeth and the protrusions are gradually reduced in the width direction of the teeth. As a result, since the direction of easy magnetization of the grain-oriented electrical steel sheet is defined as the radial direction, iron loss in the teeth is greatly reduced as compared with the case where the tooth is formed of a non-oriented electrical steel sheet. Moreover, since the teeth are formed such that the ends of the teeth on the connection side with the yoke protrude radially outward of the teeth and the protrusions are gradually reduced in the width direction of the teeth, the teeth in the closed magnetic path from the teeth to the yoke and the rotor are formed. The connection area between the teeth and the yoke is increased, and the iron loss reduction effect in which the teeth are formed of the directional magnetic steel sheets can be synergistically enhanced.

[0013]

Here, the shape, arrangement, and set of the teeth and / or the yoke are such that the connection points between the teeth and the yoke and / or the connection points between the yokes are different from the connection points adjacent to each other in the motor axial direction. It is also preferable to make any one of the adjustments different in order to reduce the loss at the connection point. In particular, the connection with the teeth yoke
The shape protruding outward on the continuation end is approximately an isosceles triangle or
Is in contact with the tooth if it has a substantially arc-shaped symmetrical shape.
The iron loss between the right and left yokes is the same.
This causes the magnetic flux to be generated everywhere on the stator.
Can provide a synchronous machine that operates uniformly and stably.
You. In addition, the shape protruding outside the teeth is asymmetrical left and right
It may be shaped, in this case teeth alternately
By using the same kind of teeth pieces
Synchronous machines can be configured.

Meanwhile, according to the stator manufacturing method of the present invention, having a structure obtained by dividing the teeth or yoke, a stator with reduced iron loss of teeth or the yoke can be easily manufactured.

Further, the present invention is provided with an assembling portion having an end different from the tip, the end on the connection side with the yoke protruding outward in the radial direction of the tooth, and the protrusion being gradually reduced in the width direction of the tooth. According to the tooth pieces, the direction of easy magnetization in the grain-oriented electrical steel sheet is the direction from the tip to the assembly portion, and the area of the connection between the teeth and the yoke in the closed magnetic path from the teeth to the yoke and the rotor is small. Because it is larger, the iron loss reduction effect can be synergistically enhanced, and when this is used in a synchronous machine, the iron loss is further reduced as compared to a configuration using only grain-oriented electrical steel sheets for teeth pieces. You. Furthermore, if a yoke piece having a shape divided into a plurality in the circumferential direction is used so that the connection points between the ring-shaped yokes are different from the connection points adjacent to each other in the stacking direction, the directional electromagnetic The direction of easy magnetization in the steel sheet is the circumferential direction of each yoke, and it is possible to further reduce the iron loss at the connection point. When this is used in a synchronous machine, the iron loss is synergistic. Reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, preferred embodiments of the present invention will be described below. FIG. 1 shows a stator 30 according to an embodiment of the present invention.
2 is a plan view showing the configuration together with the rotor 50, and FIG. 2 is a cross-sectional view showing the structure of a three-phase synchronous motor 40 incorporating the stator 30. In the following description, FIG.
In FIG. 6, the end on the connection side between the teeth and the yoke is substantially straightened.
Although drawn as a line shape (shape of the conventional example),
The teeth are connected to the yoke as shown in FIGS.
It is characterized in that the connecting end has a shape protruding outward.
You.

First, referring to FIG.
Will be described. This three-phase synchronous motor 40
Is composed of a stator 30, a rotor 50, and a case 60 for accommodating them. The rotor 50 has permanent magnets 51 to 54 affixed to its outer periphery, and rotatably supports a rotating shaft 55 provided at the center of the shaft by bearings 61 and 62 provided in a case 60. The stator 30 includes twelve teeth, and includes 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 stamping non-oriented electrical steel sheets.
As shown in the figure, the rotor 57
At positions, salient poles 71 to 74 are provided. Each rotor 57
Using a jig that is exactly the same size and shape and is positioned according to the outer shape of the salient poles 71 to 74,
Lamination is performed so that salient poles 71 to 74 are aligned in the axial direction of the rotating shaft 55. After lamination, the rotating shaft 55 is press-fitted, and the laminated rotor 57 is temporarily fixed. An insulating layer and an adhesive layer are formed on the surface of the rotor 57 made of this electromagnetic steel sheet. After lamination, the rotor 57 is heated to a predetermined temperature to melt and fix the adhesive layer.

After the rotor 50 is formed in this way, four permanent magnets 51 to 54 are attached in the axial direction on the outer peripheral surface of the rotor 50 and at an intermediate position between the salient poles 71 to 74. You. 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 passing through 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. The operation 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 where one stator and teeth at the end of the stacked stator 30 have been removed. That is, FIGS. 1 and 3 show the shapes of the stator and the teeth adjacent to each other in the axial direction. FIG. 4 is a 4-4 end view in FIG.

The stator 30 has two types of yoke pieces 2 each.
0, 21 and teeth pieces 22, 23. The yoke pieces 20, 21 and the tooth pieces 22, 23 have slightly different shapes as shown in FIG.
Is a connecting part 2 having a center angle θa and a tooth piece 22 fitted therein.
The depth of 0a is Da. On the other hand, the center angle of the yoke piece 21 is θb, and the depth of the connecting portion 20b is Db. Tooth pieces 22, 23 fitted to these yoke pieces 20, 21
Has a radial length of Ta and Tb, respectively.

Since the center angles θa and θb of the yoke pieces 20 and 21 have twelve teeth, a relationship of θa + θb = 360/6 holds. In addition, the tooth pieces 22, 23
Lengths Ta and Tb are equal to the depth D of the yoke pieces 20 and 21.
a, Db, the relationship of Ta−Da = Tb−Db is established.

Accordingly, by alternately repeating the yoke pieces 20 and 21, the circumferential portion (360 degrees) of the stator 30 is formed by the six sets of twelve 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 ends of the tooth pieces 22 and 23 are the same with respect to the outer periphery of the rotor 50. FIG. 6A shows a combination of the yoke piece 20 and the tooth piece 22.
FIG. 6B shows a combination of the yoke piece 21 and the tooth piece 23.
Are shown below.

Different from the rotor 57, a grain-oriented magnetic steel sheet is used for the yoke pieces 20, 21 and the tooth pieces 22, 23. As shown by arrows X and Y in FIG.
0, 21 in the circumferential direction, teeth pieces 22, 2
3 is in the radial direction. Therefore, as shown in FIG. 1, taking the magnetic flux generated by the permanent magnets 51 and 52 as an example, in the yoke pieces 20 and 21 and the tooth pieces 22 and 23, the direction of the magnetic field coincides with the direction of easy magnetization of the electromagnetic steel sheet. ing.

The stator 30 is formed by laminating a plurality of yoke pieces 20 and 21 and tooth pieces 22 and 23 formed by punching the above-described grain-oriented electromagnetic 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
3 are alternately arranged also in the laminating direction. An insulating layer and an adhesive layer are formed on the surface of these grain-oriented electrical steel sheets, and after lamination, the laminated layer is 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 tooth pieces 22, 23
Are connected alternately between adjacent ones in the stacking direction. Although not particularly shown, the yoke pieces 20, 2
1 also have different circumferential widths (center angles), so that the connection positions of the yoke pieces 20 and 21 adjacent in the stacking direction are also alternated.

For the magnetic flux formed by the permanent magnets 51 to 54, the yoke pieces 20, 21 and the tooth pieces 22,
It is considered that the connection by abutment with 23 lowers the magnetic permeability as compared with the one having an integral structure even if both are brought into close contact. However, the reduction in iron loss due to the use of the grain-oriented electrical steel sheet more than compensates for the loss at the connection. Furthermore, if the connecting portions of the magnetic steel sheets are staggered between adjacent ones as in the present embodiment, the magnetic flux is formed at a portion relatively close to the surface of the magnetic steel sheets, and the yoke pieces 20, 21 The loss due to the connection with the teeth 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 direction of easy magnetization of the material is adjusted to the direction of the magnetic field by the permanent magnets 51 to 54 between the yoke piece and the tooth piece, iron loss is reduced by several tens of percent, This can be directly converted into an improvement in the efficiency of the synchronous motor 40.

As a result, the efficiency of the three-phase synchronous motor 40 employing such a structure is improved, and the output torque is increased if the three-phase synchronous motor 40 has the same shape. In addition, as long as the same output torque is obtained, the size can be reduced and power saving can be achieved. Therefore, it is possible to improve the performance (e.g., mileage, maximum load, maximum speed, etc.) of a device equipped with the three-phase synchronous motor 40, for example, an electric vehicle.

Further, when the stator 30 is composed of the yoke pieces 20 and 21 and the tooth pieces 22 and 23 as in the present embodiment, it is not necessary to punch out the stator at a time using a large die, which is several minutes of the conventional type. One size mold can be used. As a result, advantages such as a reduction in die cost and an improvement in yield by being able to reduce the area of the electromagnetic steel sheet which cannot be used by punching out are also obtained.

In addition, the yoke pieces 20, 2 in this embodiment are
1 and the actual shapes of the tooth pieces 22 and 23 are
The end on the connection side with the yoke projects radially outward of the tooth.
And the protrusion is gradually reduced in the width direction of the tooth.
Shape is adopted. Various variations are conceivable for this type of shape . For example, as shown in FIG. 7, the yoke piece 120 side end portion of the tooth piece 122 lateral pairs
Pointed into isosceles triangles of nominal shape and connected to the teeth
It is also preferable that the magnetic flux is easily formed on the left and right yokes. In this case, the angle of the tip of the tooth piece 122 is preferably about 90 degrees.

Further, as shown in FIG.
The same effect can be obtained even if the end portion 2 is formed by a curve bulging outward. Furthermore, if convex portions 132a in the width direction are provided at both ends of the end portion of the tooth piece 132 and the fitting portion of the yoke piece 130 has a shape corresponding to this, connection with the yoke piece 130 is hard to be disconnected, and the stator It is suitable as a structure.

In the above embodiment, two kinds of yoke pieces and tooth pieces are combined so that the connection position between the yoke piece and the tooth piece is staggered between adjacent ones in the laminating direction. As shown, if the yoke piece 140 and the tooth piece 142 are left-right asymmetric and are alternately combined on the front and back, at least the tooth piece 142 can be of the same type. In order to shift the joining position between the yoke pieces 140, two types of yoke pieces, a wide yoke piece and a narrow yoke piece, are required. However, as shown in FIG. If the yoke piece 150 shifted from the center is used, only one type can be used. This is because if the yoke pieces 150 are alternately stacked, the yoke pieces adjacent to each other in the stacking direction are shifted and overlap with each other as shown by the broken line in FIG. Note that if the left and right teeth pieces 152 are not symmetrical, it is needless to say that only one type of tooth piece can be used.

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 2 formed by punching a non-oriented electrical steel sheet.
20 and 12 tooth pieces 222 and 223 assembled to the yoke portion. Tooth 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 teeth pieces 22 and 23 of the first embodiment ( the ends on the connection side with the yoke are not shown in the figure).
7 to FIG.
That). The point that the easy direction of magnetization of the magnetic steel sheet coincides with the radial direction of the teeth is also the same as in the first embodiment.

The yoke part 220 includes the tooth pieces 222, 2
23 are provided with connection portions having different depths corresponding to the difference in the length in the radial direction, into which the teeth pieces 222 and 223 are fitted.
It is assembled. In the laminating direction, these yoke portions 220 and the tooth pieces 222 and 223 have a relationship in which adjacent ones are shifted in the rotation direction by 30 degrees.
That is, focusing on one tooth, the tooth pieces 222 and the tooth pieces 223 are alternately stacked. The yoke 220, the teeth 222, 223
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 formed of non-oriented electrical steel sheets, and the iron loss on the stator side is reduced as a whole. Further, similarly to the first embodiment, the connection between the tooth piece and the yoke portion is alternate between those adjacent to each other in the laminating direction, and the loss at the connection portion is suppressed to be small. In this embodiment, there is an advantage that only one type of the yoke 220 is required. Also, the yoke part 220
Are annular, it is easy to ensure the strength of the stator 230.

Next, a method of manufacturing a stator will be described as another embodiment of the present invention. FIG. 12 and FIG. 13 are explanatory views showing the structure of a jig for assembling the stators 30 and 230 of the above several embodiments. FIG. 12 shows the upper jig 300
13 is an axial end view of the lower jig 350 and FIG.
0 is a plan view. In addition, since it is left-right symmetric, the illustration of the left half in FIG. Also the actual tea
7 to 9 similarly to the above-described embodiment.
It has a shape with its connection side end protruding outward.
Shows a simplified one on a substantially straight line.

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

To assemble the stator 30 of the first embodiment, first, the tooth pieces 22 and
23 are fitted into 12 sets of 6 sets for one layer, and then the corresponding yoke pieces 20 and 21 are fitted. This completes one layer,
Subsequently, the tooth pieces 22, 23 are fitted so as to be alternate with the tooth pieces 22, 23 already fitted. Thereafter, the yoke pieces 20 and 21 are fitted. This process is performed alternately, and the yoke pieces 20 and 21 and the tooth pieces 22 and 23 that are sufficient to constitute the stator 30 are stacked. 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.
, A pressing portion 380 is fixed by screws. The pressing portion 380 has a shape corresponding to the concave portion of the lower jig 350, and can be fitted into the concave portion with a predetermined clearance.

After fitting a predetermined number of yoke pieces 20 and 21 and teeth pieces 22 and 23 into the recesses, the entire lower jig 350 is heated to a predetermined temperature, and the adhesive layer laminated on the surface of the electromagnetic steel sheet is melted. And From this state, the upper jig 300
Is lowered toward the lower jig 350, and the tips of the pressing portions 380 are stacked on the yoke pieces 20, 21, the tooth pieces 22,
After contact with 23, it is pressurized. In this state, the temperature of the entire lower jig 350 is lowered, and the yoke piece 2 is
0, 21 and the tooth pieces 22, 23 are fixed to each other. Thereafter, 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 respectively divided, there is obtained an advantage that a large number of pieces can be easily laminated. In addition, with the same jig,
The stator 230 of the second embodiment shown in FIG. 11 can be manufactured.

The embodiments of the present invention have been described above.
The present invention is not limited to such embodiments at all. For example, the number of slots per pole is not limited to three.
Configuration of the number of poles other than poles, configuration applied to synchronous generators, etc.
It goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[0043]

As described above, the synchronous machine according to the present invention is fixed.
In the fixed element , since a grain-oriented magnetic steel sheet can be used for the teeth or the yoke, an excellent effect that the iron loss can be remarkably reduced as compared with the conventional steel sheet using the non-oriented magnetic steel sheet can be obtained. Furthermore, if any one of the shapes, arrangement, and combination of the teeth and the yoke is made different and the connection position is different between adjacent ones in the laminating direction, the connection between the yoke and the teeth or the yokes is caused. Therefore, it is possible to avoid the problem of increased iron loss, which is more preferable. In addition, since the teeth are formed such that the ends on the connection side with the yoke project outward and the projections are gradually reduced in the width direction of the teeth, the teeth and the yoke in the closed magnetic path from the teeth to the yoke and the rotor are formed. The connection area is increased, the formation of magnetic flux is facilitated, and the effect of reducing iron loss, in which the teeth are made of grain-oriented electrical steel sheets, can be synergistically enhanced.

Further, according to the method of manufacturing a stator for a synchronous machine of the present invention, it is possible to easily manufacture a stator having a structure of divided teeth and a yoke and reducing iron loss in the teeth and the yoke. It has an excellent effect that it can be done. Further, according to the tooth piece of the present invention, the direction of easy magnetization coincides with the direction of the magnetic field, so that the iron loss when incorporated in the synchronous machine is reduced. In addition, since the teeth are formed such that the ends on the connection side with the yoke project outward and the projections are gradually reduced in the width direction of the teeth, the teeth and the yoke in the closed magnetic path from the teeth to the yoke and the rotor are formed. The connection area increases,
In addition, the magnetic flux can be easily formed, and the iron loss reducing effect in which the teeth are formed of the grain-oriented magnetic steel sheets can be synergistically enhanced.

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 lowering the performance of the synchronous motor or the synchronous generator. It has an extremely excellent effect. As a result, the outer diameter and the weight of the synchronous motor and the synchronous generator can be reduced, and the size and weight of the motor and the like can be reduced. Furthermore, it also contributes to the improvement of the performance of a device incorporating the motor or the like, for example, an electric vehicle.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory view showing a structure of adjacent layers of a stacked stator 30;

FIG. 4 is a 4-4 end view in FIG. 3;

FIG. 5 is a plan view showing the shapes of yoke pieces 20, 21 and tooth pieces 22, 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 tooth piece and the tooth piece.

FIG. 7 is an explanatory view showing a modification of the yoke piece and the tooth piece in the embodiment.

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

FIG. 9 is an explanatory diagram showing a shape when only one type of tooth piece is used.

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

FIG. 11 is a plan view illustrating a configuration of a stator 230 according to a second embodiment.

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

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

[Explanation of symbols]

 20, 21 ... yoke piece 20a ... connection part 20b ... connection part 22, 23 ... teeth piece 30, 230 ... stator 32 ... stator coil 40 ... three-phase synchronous motor 50 ... rotor 51 to 54 ... permanent magnet 55 ... rotation Shaft 57 ... Rotor 60 ... Cases 61 and 62 ... Bearings 71 to 74 ... Salient poles 120, 130, 140, 150 ... Yoke pieces 122, 132, 142, 152 ... Teeth pieces 132a ... Convex part 220 ... Yoke parts 222, 223 ... Teeth piece 230 ... stator 300 ... upper jig 310 ... base 320 ... outer peripheral member 330 ... center member 340 ... member 350 ... lower jig 360 ... arm 370 ... upper base 380 ... pressing section

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kaoru Kubo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (56) References JP-A-4-217831 (JP, A) JP-A-2-7851 (JP, a) JitsuHiraku Akira 60-186834 (JP, U) JitsuHiraku Akira 61-92171 (JP, U) JitsuHiraku Akira 63-38046 (JP, U) (58 ) investigated the field (Int.Cl. ⁷ , DB name) H02K 1/16 H02K 1/02 H02K 15/02

Claims (8)

(57) [Claims] 1. A plurality of stator provided with a tooth the stator coil is wound, a stator of the synchronous machine be laminated and fixed in the thickness direction, at least the teeth and the yoke separate from And the tee
The teeth are formed of a grain-oriented electrical steel sheet whose end on the connection side with the yoke projects radially outward of the teeth and whose projections are gradually reduced in the width direction of the teeth. A stator of a synchronous machine whose radial direction is the direction of easy magnetization of an electrical steel sheet. 2. The stator 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 are different from the connection points adjacent to each other in the stacking direction. A stator of a synchronous machine in which one of the shapes, arrangement, and combination of the teeth and / or the yoke is different . 3. The synchronous machine according to claim 1 or 2,
A stator for a synchronous machine, wherein a shape of a protruding end of the tooth on the connection side with the yoke outward in a radial direction of the tooth is an approximately isosceles triangular arc-shaped left-right symmetric shape . 4. The synchronous machine according to claim 1 or 2,
A stator for a synchronous machine, wherein a shape of a protruding end of the tooth on the connection side with the yoke outward in a radial direction of the tooth is a left-right asymmetric shape . 5. A yoke and teeth constituting a stator of the synchronous machine are formed separately, and at least the teeth protrude radially outside of the teeth at an end on a connection side with the yoke and connect the protrusions to the teeth. An assembling jig provided with a recess having a cross-sectional shape of a stator, wherein the direction of easy magnetization is formed as a radial direction of the synchronous machine by a grain-oriented electrical steel sheet having a shape gradually reduced in a width direction of the teeth and having an insulating layer on a surface. To
Fitted with said teeth and the yoke, repeat this in the rotation axis direction of the synchronous machine laminating the said tooth and the yoke, the solid of the synchronous machine for fixing the said laminated teeth and the yoke
The method of manufacturing the setum . 6. A method for producing a stator of a synchronous machine according to claim 5, wherein connection points between at least the yoke, circumferentially so as to position different from the those connection points that are adjacent in the stacking direction
Thereby divided into a plurality in a square direction, the yoke by the directional electromagnetic steel sheet having an insulating layer, to form the easy magnetization direction as the rotation direction of the synchronous machine, the assembly jig having a recess having a cross-sectional shape of the stator To
Fitted with said teeth and the yoke, repeat this in the rotation axis direction of the synchronous machine laminating the said tooth and the yoke, the solid of the synchronous machine for fixing the said laminated teeth and the yoke
The method of manufacturing the setum . 7. A tooth piece used for a stator of a synchronous machine, which is formed of a grain-oriented electrical steel sheet having an insulating layer on a surface, and has an end different from an end on a connection side with a yoke for the tooth. A tooth piece having an assembling part projecting radially outward and having a shape in which the projection is gradually reduced in the width direction of the tooth, and wherein the direction of easy magnetization of the magnetic steel sheet is from the tip to the assembling part. 8. A yoke piece used for the stator of the synchronous machine, connection points of the yoke between the ring-shaped, its periphery Direction so that different positions from those connection points that are adjacent in the stacking direction It has a plurality of divided shapes, and has an assembling portion with a tooth having a shape in which the end on the connection side with the yoke projects radially outward of the tooth on the inner peripheral side and the projection is gradually reduced in the width direction of the tooth. And a yoke piece formed of a grain-oriented electrical steel sheet having an insulating layer on the surface, with the direction of easy magnetization of the electrical steel sheet being the circumferential direction.