WO2017141761A1

WO2017141761A1 - Stator of rotating electric machine, rotating electric machine using same, and manufacturing method for stator of rotating electric machine

Info

Publication number: WO2017141761A1
Application number: PCT/JP2017/004341
Authority: WO
Inventors: 智史箱田; 隆之鬼橋; 直弘桶谷
Original assignee: 三菱電機株式会社
Priority date: 2016-02-16
Filing date: 2017-02-07
Publication date: 2017-08-24
Also published as: JPWO2017141761A1; CN108702044A; DE112017000839T5; CN108702044B; JP6486545B2

Abstract

The present invention is provided with a plurality of magnetic pole pieces (2) and yoke pieces (3) disposed in a loop. The magnetic pole pieces (2) each have a back yoke portion (4A) disposed on the loop-shaped outer periphery portion of the magnetic pole piece, and a tooth (5) that extend towards the center of the loop from the back yoke portions (4A). The yoke pieces (3) each have only a back yoke portion (4B) disposed along the loop-shaped outer periphery of the yoke piece. The magnetic pole pieces (2) and the yoke pieces (3) are disposed alternately in a loop and are linked so as to be bendable at the ends of the mutually adjacent back yoke portions (4A, 4B).

Description

Stator for rotating electrical machine, rotating electrical machine using the same, and method for manufacturing stator for rotating electrical machine

The present invention relates to a stator for a rotating electrical machine, a rotating electrical machine using the stator, and a method for manufacturing a stator for a rotating electrical machine.

For a stator of a rotating electrical machine, a laminated iron core having a structure in which a plurality of thin silicon steel plates punched by a press or the like are laminated and integrated by caulking or welding is used. Further, by winding the windings around the stator at high density, it is possible to increase the efficiency, capacity, and size of the rotating electrical machine. In order to improve workability, a split core obtained by dividing the stator core into a plurality of parts is employed. For example, a stator is disclosed in which the back yoke portions are connected to each other so as to be bendable, and two unit cores are continuously wound as a set, and three sets are arranged in an annular shape (for example, Patent Document 1).
In this stator, the back yoke parts are connected so that they can be bent, and the coil is continuously wound around each pole piece without cutting, thereby reducing the number of connection of the winding terminal part and reducing the production cost. it can.

JP 2010-246352 A (paragraphs [0011], [0012] and FIGS. 1 and 2)

However, when the invention disclosed in Patent Document 1 is applied to, for example, a stator of 4 teeth and each pole piece is arranged in an annular shape, the back yoke portion has an arc shape, and when winding around the teeth portion, The operating range is restricted by the back yoke. For this reason, in a rotating electrical machine that requires a higher space factor, it is necessary to devise winding work.

The present invention has been made to solve the above-described problem, and provides a stator for a rotating electrical machine that can take a wide space between teeth portions, a rotating electrical machine using the stator, and a method for manufacturing a stator for a rotating electrical machine. The purpose is to provide.

A stator for a rotating electrical machine according to the present invention includes a plurality of magnetic pole pieces and yoke pieces arranged in an annular shape, and the magnetic pole pieces include a back yoke portion arranged along an annular outer peripheral portion, and a back yoke portion. An annular teeth portion extending in the center direction, and the yoke piece has only a back yoke portion disposed along the annular outer peripheral portion, and at least one yoke piece is provided between at least a pair of adjacent magnetic pole pieces. And a pair of magnetic pole pieces and a yoke piece between the pair of magnetic pole pieces are connected so as to be bendable.

A rotating electrical machine according to the present invention includes a stator of the rotating electrical machine and a rotor provided rotatably in the stator of the rotating electrical machine.

A method of manufacturing a stator for a rotating electrical machine according to the present invention includes a plurality of magnetic pole pieces and yoke pieces arranged in an annular shape, and the magnetic pole pieces are arranged along an annular outer peripheral portion, and a back yoke Teeth portion extending in the center direction of the ring, the yoke piece has only the back yoke portion arranged along the annular outer peripheral portion, and the pole pieces and the yoke pieces are alternately arranged in an annular shape. In the stator of a rotating electrical machine, the pole piece and the yoke piece are foldably connected so that the longitudinal direction of the back yoke portion of the magnetic pole piece and the longitudinal direction of the back yoke portion of the yoke piece coincide with the rolling direction of the electromagnetic steel sheet. Punching, punching process for stacking and fixing in the axial direction, winding process for winding the coil around the teeth part, and the pole piece and yoke piece around which the coil is wound around the tooth part are bent into an annular shape and attached together Combining a core closing step integrating it is made of and.

According to the stator of the rotating electrical machine according to the present invention, since it is composed of the magnetic pole piece having the back yoke portion and the tooth portion and the yoke piece having only the back yoke portion, a large space between the tooth portions can be taken.

According to the rotating electrical machine according to the present invention, since the stator of the rotating electrical machine including the magnetic pole piece having the back yoke portion and the tooth portion and the yoke piece having only the back yoke portion is used, the space between the tooth portions is reduced. Can be taken widely.

According to the method for manufacturing a stator of a rotating electrical machine according to the present invention, since the magnetic pole piece having the back yoke portion and the tooth portion and the yoke piece having only the back yoke portion are formed, a large space is provided between the tooth portions. Can do.

It is sectional drawing which shows the structure of the stator of the rotary electric machine of the electric motor which concerns on Embodiment 1 of this invention. It is a board drawing of the magnetic pole piece and yoke piece which concern on the stator of the rotary electric machine of Embodiment 1 of this invention. It is explanatory drawing of the coil | winding operation | work which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is fitting explanatory drawing at the time of the connection which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is sectional drawing which shows the structure of the comparative example which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is a plan drawing of the pole piece of the comparative example which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is explanatory drawing of the winding operation | work of the comparative example which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. FIG. 3 is an explanatory diagram illustrating a relationship between a magnetic pole piece and a yoke piece according to the stator of the rotating electrical machine according to the first embodiment of the present invention. FIG. 3 is an explanatory diagram illustrating a relationship between a magnetic pole piece and a yoke piece according to the stator of the rotating electrical machine according to the first embodiment of the present invention. It is a flowchart which concerns on the manufacturing method of the stator of the rotary electric machine of Embodiment 1 of this invention. It is sectional drawing which shows the other structural example which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is sectional drawing which shows the other structural example which concerns on the stator of the rotary electric machine of Embodiment 1 of this invention. It is explanatory drawing of the coil | winding operation | work which concerns on the stator of the rotary electric machine of Embodiment 2 of this invention. It is explanatory drawing of the winding operation | work of the comparative example which concerns on the stator of the rotary electric machine of Embodiment 2 of this invention. It is explanatory drawing of the connection means which concerns on the stator of the rotary electric machine of Embodiment 3 of this invention. It is sectional drawing which shows the structure which concerns on the stator of the rotary electric machine of Embodiment 4 of this invention. It is sectional drawing which shows the structure of the rotary electric machine of Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiment 1 relates to a stator for a rotating electrical machine that includes a magnetic pole piece and a yoke piece, and a method for manufacturing a stator for a rotating electrical machine that includes a punching process, a winding process, and a core closing process.

FIG. 1 is a cross-sectional view showing the configuration of a stator of a rotating electrical machine, and shows the configuration of the stator of the rotating electrical machine, and the plate of the magnetic pole piece and the yoke piece according to Embodiment 1 of the present invention. FIG. 2 which is a diagram, FIG. 3 which is an explanatory diagram of winding work, FIG. 4 which is a fitting explanatory diagram at the time of connection, FIG. 5 which is a cross-sectional view showing the structure of a comparative example, 6 is an explanatory diagram of winding work of a comparative example, FIG. 7 is a flowchart for explaining a method of manufacturing a stator of a rotating electrical machine, FIGS. 8 to 9 are explanatory diagrams of the relationship between a pole piece and a yoke piece, and FIG. 10 and FIG. 11 to FIG. 12, which are sectional views of other configuration examples of the stator of the rotating electrical machine, will be described.

First, the stator configuration of the rotating electrical machine of the first embodiment will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a configuration of a stator 1 of a rotating electrical machine.
In the first embodiment, a stator 1 of a rotating electrical machine composed of four pole pieces 2 and yoke pieces 3 will be described as an example.
The pole piece 2 has a structure in which a plurality of thin electromagnetic steel plates are laminated in the axial direction. The pole piece 2 includes a back yoke portion 4A extending in a direction perpendicular to the stacking direction and a teeth portion 5 protruding from the back yoke portion 4A toward the inside in the stator radial direction.
The yoke piece 3 has a structure in which a plurality of thin electromagnetic steel plates are laminated along the axial direction. The yoke piece 3 has only a back yoke portion 4B extending in a direction perpendicular to the stacking direction.
Although the back yoke portion of the magnetic pole piece 2 is distinguished from 4A and the yoke piece 3 back yoke portion is distinguished from 4B, it is appropriately described as the back yoke portion 4 when it is not necessary to distinguish between them.

The pole pieces 2 and the yoke pieces 3 are alternately arranged in an annular shape, and are connected so as to be bendable by thin portions 6 on the outer periphery of the

back yoke portions

4A and 4B adjacent to each other. However, only one of the adjacent

back yoke portions

4A and 4B is not connected, but is provided with a coupling convex portion 7 on one side and a coupling concave portion 8 on the other side, and is abutted against each other.
That is, the stator 1 of the rotating electric machine includes a plurality of magnetic pole pieces 2 and yoke pieces 3 arranged in an annular shape, and the magnetic pole piece 2 includes a back yoke portion 4A arranged along the annular outer peripheral portion, And a tooth portion 5 extending from the yoke portion 4A toward the center of the ring. The yoke piece 3 has only the back yoke part 4B arrange | positioned along the cyclic | annular outer peripheral part.
An insulator 9 covers the periphery of the tooth portion 5 of the magnetic pole piece 2, and a coil 10 is wound around the insulator 9.
In addition, although it expressed with cyclic | annular here, as it is clear also from sectional drawing of FIG. 1, the cyclic | annular form here is not restricted only to the cyclic | annular form whose cross section is a perfect circle. For example, it is a concept including a case of a substantially annular shape such as a substantially quadrangular shape, a substantially hexagonal shape, a substantially octagonal shape, and other polygons.
Moreover, in FIG. 1, the arrow H has shown the direction through which magnetic flux flows. In other drawings, the arrow H similarly indicates the direction in which the magnetic flux flows.

Next, plate cutting and punching for manufacturing the magnetic pole piece 2 and the yoke piece 3 relating to the stator 1 of the rotating electrical machine from the electromagnetic steel plate 31 will be described.
FIG. 2 is a plan view in the case where a steel plate piece 32 is cut from a strip-shaped electromagnetic steel plate 31 for the stator 1 of the rotating electrical machine.
In FIG. 2, an arrow J indicates the feeding direction of the electromagnetic steel sheet 31. In other drawings, the arrow J similarly indicates the feeding direction of the electromagnetic steel sheet 31. The feeding direction J of the electromagnetic steel sheet 31 and the rolling direction J of the electromagnetic steel sheet 31 are the same.
The steel plate piece 32 includes the magnetic pole piece 2 and the yoke piece 3, and the longitudinal direction of the back yoke portion 4A of the magnetic pole piece 2 and the longitudinal direction of the back yoke portion 4B of the yoke piece 3 coincide with each other. The longitudinal direction of the steel plate piece 32, that is, the longitudinal direction of the back yoke portions 4 </ b> A and 4 </ b> B of the magnetic pole piece 2 and the yoke piece 3 coincides with the feeding direction J of the electromagnetic steel plate 31. In the vertical direction, two steel plate pieces 32 are arranged in parallel.
At this time, the two steel plate pieces 32 are arranged so that the tooth portions 5 of the both steel plate pieces 32 are opposed to each other, and the other steel plate piece is interposed between the tooth portion 5 and the tooth portion 5 of the one steel plate piece 32. The teeth 32 of the pieces 32 are arranged in parallel so as to be accommodated.

As shown in FIG. 2, two steel plate pieces 32 arranged on the electromagnetic steel plate 31 are punched out. A predetermined number of steel plate pieces 32 punched from the strip-shaped electromagnetic steel plate 31 are automatically laminated and fixed by caulking to constitute the magnetic pole piece 2 and the yoke piece 3 of the stator 1 of the rotating electrical machine.
Thereafter, an insulator 9 made of an insulating material is integrally formed on the outer periphery of the tooth portion 5 of the pole piece 2.
In FIG. 2, A0 is the area of the hatched portion, that is, the area of one steel plate piece 32.

Next, the winding work concerning the stator 1 of the rotating electrical machine will be described.
FIG. 3 is an explanatory diagram of the winding work performed using the automatic winding machine 21 when forming the stator 1 of the rotating electrical machine. FIG. 3A is a top view of the magnetic pole piece 2, the yoke piece 3 and the automatic winding machine 21 during the winding operation. FIG. 3B is a cross-sectional view taken along the line XX ′ of FIG.
For easy understanding of the winding state, a state in which the coil 10 is wound around the tooth portions 5 of the four magnetic pole pieces 2 is shown, and the tooth portion 5 on which the winding is applied shows a cross section.
In order to make the following description easy to understand, in FIG. 3 (a), the left pole piece 2 is replaced by the first pole piece 2, the second pole piece 2, the third pole piece 2, and the right end pole piece. 2 is referred to as a fourth pole piece 2.

The automatic winding machine 21 includes a fixing jig 22 for fixing the magnetic pole piece 2 and the yoke piece 3 before winding, and a flyer 23 for winding the coil supply. The fixing jig 22 includes a base portion 24, a pressing plate 25, screws 26, and guide pins 27.
The pole piece 2 is installed on the end face in the axial direction of the base portion 24 so that the longitudinal direction of the back yoke portion 4A of the pole piece 2 and the longitudinal direction of the back yoke portion 4B of the yoke piece 3 coincide. As shown in FIG. 3 (b), the end surface of the yoke piece 3 on the outer side in the radial direction and the base portion 24 are positioned by surface contact. The holding plate 25 is for holding the back yoke portion 4B of the yoke piece 3 between the base portion 24 and the plate in the axial direction. The back yoke portion 4B of the yoke piece 3 is sandwiched between the presser plate 25 and the base portion 24 and fixed with screws 26.

The guide pin 27 is for guiding the connecting wire 20 that connects the coil 10 wound around the tooth portion 5 of each pole piece 2 during winding. The guide pin 27 is installed on the base portion 24 so as to be positioned near the rotation center of the bent portion connecting the magnetic pole piece 2 and the yoke piece 3. The flyer 23 is arranged so that the rotation axis B coincides with the longitudinal direction of the tooth portion 5 of the magnetic pole piece 2, and slides in the direction C coincident with the longitudinal direction of the tooth portion 5 of the magnetic pole piece 2. The sliding movement is also performed in a direction D that coincides with the longitudinal direction of the second back yoke portion 4A.

After the winding work to the tooth portion 5 of the first magnetic pole piece 2 is finished, the flyer 23 is slid in the direction D, and the teeth portion 5 and the flyer 23 of the adjacent second magnetic pole piece 2 not wound. The rotation axis B is moved to a position where the rotation axis B faces. At this time, the winding end portion of the coil 10 wound around the tooth portion of the first magnetic pole piece 2 is not cut, and is used as a crossover 20 along the outside of the guide pin 27 included in the fixing jig 22. . Subsequently, the coil 10 is wound in the direction opposite to the direction in which the coil 10 is wound around the first tooth portion 5 with respect to the tooth portion 5 of the second magnetic pole piece 2. As described above, the winding work is sequentially performed from the tooth portion 5 of the first magnetic pole piece 2 to the tooth portion 5 of the fourth magnetic pole piece 2.

Next, after completion of the winding work of the teeth portion of the pole piece 2, the work of closing and integrating the core to complete the stator 1 of the rotating electrical machine will be described.
FIG. 4 is a view when the four magnetic pole pieces 2 and the yoke pieces 3 after the end of the winding operation are bent and deformed from the linear shape at the time of the winding operation. The tip end of each magnetic pole piece 2 on the free end side of the tooth portion 5 is sequentially pressed against the core metal 30, and the magnetic pole piece 2 and the yoke piece 3 are bent in an annular shape from the linear shape at the time of winding.
A coupling convex portion 7 and a coupling concave portion 8 are formed on the end faces of the magnetic pole piece 2 and the yoke piece 3 that are abutted when the ring is closed, and both end faces are fitted by insertion from the circumferential direction. After fitting, from the outer peripheral side of the fitting portion between the coupling convex portion 7 and the coupling concave portion 8, the end faces abutted by, for example, welding means such as TIG (tungsten inert gas) welding are coupled and integrated. This completes the core closing operation and completes the stator 1 of the rotating electrical machine.
By providing the coupling convex portion 7 and the coupling concave portion 8 on the butting surface, it is possible to suppress the play in the radial direction when butting, and to improve the inner diameter roundness.

Next, in order to clarify the characteristics of the stator 1 of the rotating electrical machine composed of the magnetic pole piece 2 and the yoke piece 3, a comparison with a comparative example is performed.
FIG. 5 is a cross-sectional view showing the configuration of the stator 101 of the rotating electrical machine of the comparative example. The stator 101 of the rotating electrical machine has only four magnetic pole pieces 102. The pole piece 102 has a structure in which a plurality of thin electromagnetic steel plates are laminated along the axial direction, and a back yoke portion 104 extending in a direction perpendicular to the laminating direction and a tooth extending from the back yoke portion 104 in an annular central direction. Part 105. A coil 110 is wound around an insulator covering the tooth portion 105. The pole pieces 102 are connected so as to be bendable by thin portions 106 on the outer periphery of the back yoke portions 104 adjacent to each other.
In FIG. 5, an arrow H indicates the direction in which the magnetic flux flows.

FIG. 6 is a plan view in the case where a steel plate piece 132 is cut from the strip-shaped electromagnetic steel plate 31 for the stator 101 of the rotating electrical machine. The steel plate pieces 132 have a shape in which the longitudinal directions of the back yoke portions 104 of the magnetic pole pieces 102 coincide with each other. Two steel plate pieces 132 are arranged in parallel in a direction perpendicular to the feeding direction J of the electromagnetic steel plate 31 in which the longitudinal direction of the back yoke portion 104 of the magnetic pole piece 102 coincides with the feeding direction J of the electromagnetic steel plate 31. .
Similar to the stator 1 of the rotating electrical machine described with reference to FIG. 2, the two steel plate pieces 132 are arranged so that the tooth portions 105 of both the steel plate pieces 132 are opposed to each other. Then, the two steel plate pieces 132 are arranged in parallel and punched out so that the tooth portion 105 of the other steel plate piece 132 fits between the teeth portion 105 and the teeth portion 105 of one steel plate piece 132.
In FIG. 6, B 0 is the area of the hatched portion, that is, the area of one steel plate piece 132.

Here, the difference in the magnetic material usage rate between the stator 1 of the rotating electrical machine of the first embodiment and the stator 101 of the rotating electrical machine of the comparative example will be described based on FIG. 2 and FIG. 6.
In the planing arrangement of the stator 1 of the rotating electrical machine of the first embodiment shown in FIG. 2, the material usage rate (2A0 / (L1 × L2)) is 37.8%, where A0 is the area of the steel plate piece 32.
On the other hand, in the planing arrangement of the stator 101 of the rotating electrical machine of the comparative example shown in FIG. 6, when the area of the steel plate piece 132 is B0, the material usage rate (2B0 / (L3 × L4)) is 36.7%. It is.
As described above, the stator 1 of the rotating electrical machine according to the first embodiment configured by the magnetic pole piece 2 and the yoke piece 3 is compared with the stator 101 of the rotating electrical machine of the comparative example configured by only the magnetic pole piece 102. High material usage rate can be obtained.
The reason for this is that the longitudinal direction of each of the

back yoke portions

4A and 4B of the pole piece 2 and the yoke piece 3 is in the rolling direction J of the electromagnetic steel sheet 31 in the planing arrangement of FIG. This is because the matching amount is large.

Moreover, in the planing arrangement of the stator 1 of the rotating electrical machine shown in FIG. 2, the direction H of the magnetic flux flowing through the back yoke portion 4 of the magnetic pole piece 2 and the yoke piece 3 in FIG. Yes.
On the other hand, in the planer arrangement of the stator 101 of the rotating electrical machine of the comparative example shown in FIG. 6, the direction of the inner magnetic flux of the magnetic flux flowing through the back yoke portion 104 of the pole piece 102 of FIG. The amount corresponding to J is smaller than that of the stator 1 of the rotating electrical machine.
Generally, in the rolling direction and the direction perpendicular thereto, the rolling direction has a smaller magnetic resistance, and iron loss can be reduced. For this reason, the pole piece 2 and the yoke piece 3 having better magnetic characteristics in the plate arrangement of the stator 1 of the rotating electric machine of the first embodiment than in the plate arrangement of the stator 101 of the rotary electric machine of the comparative example. Is obtained.

FIG. 7 is an explanatory diagram of a winding operation performed using the automatic winding machine 21 in the stator 101 of the rotating electrical machine of the comparative example. In FIG. 7, the fixing jig is omitted.
When winding the tooth portion 105 of the magnetic pole piece 102, if the winding is attempted on the back yoke portion 104 side of the tooth portion 5 of the magnetic pole piece 102, the turning surface Q of the flyer 23 and the back yoke portion 104 interfere with each other. . For this reason, it is difficult to wind around this part using only the flyer 23.
On the other hand, in the stator 1 of the rotating electrical machine according to the first embodiment, when the winding work is performed on the tooth portion 5 of the pole piece 2 as is apparent in FIG. 3, the back yoke portion 4B of the yoke piece 3 is the flyer 23. It is located outside the turning surface Q. For this reason, it is possible to reliably avoid the back yoke portion 4B of the yoke piece 3 from interfering with the flyer 23. Thereby, the alignment winding to the back yoke part 4A side of the teeth part 5 of the magnetic pole piece 2 can be facilitated, and high-speed winding is possible.

Further, the pitch E1 between the tooth portions 5 of each pole piece 2 during winding of the stator 1 of the rotating electrical machine according to the first embodiment (FIG. 3) and each magnetic pole during winding according to the stator 101 of the rotating electrical machine of the comparative example. When the pitch E2 between the tooth portions 105 of the piece 102 (FIG. 7) is compared, E1> E2. For this reason, when winding around the tooth part 5 of the magnetic pole piece 2, it is easy to avoid that the tooth part 5 of the adjacent magnetic pole piece 2 interferes with the flyer 23.

Next, the relationship between the magnetic pole piece 2 and the yoke piece 3 according to the stator 1 of the rotating electrical machine of the first embodiment will be described with reference to FIGS. 8 and 9. 8 and 9, a portion corresponding to the thin portion 6 is a seam 11.
FIG. 8 shows a case where the circumferential lengths of the back yoke portion 4A and the yoke piece 3 back yoke portion 4B of the magnetic pole piece 2 constituting the stator 1 of the rotating electrical machine, that is, the interval between the joints 11 are different. Here, FIG. 8A is a cross section showing the configuration of the stator 1 of the rotating electrical machine, and FIG. 8B shows the arrangement shape at the time of winding.
In FIG. 8A, the angle formed by the joint 11 and the central axis at both ends of the pole piece 2 is θ1, and the angle formed by the joint 11 and the central axis at both ends of the yoke piece 3 is θ2. Here, the magnetic pole piece 2 and the yoke piece 3 are arranged so that θ1> θ2.
For this reason, as shown in FIG. 8B, the back yoke portion 4 </ b> A of the magnetic pole piece 2 exists on the back surface of the insulator 9 on the back yoke side. Therefore, when the coil is wound around the tooth portion 5 of the pole piece 2 by arranging the longitudinal direction of the back yoke portion 4A of the pole piece 2 and the longitudinal direction of the back yoke portion 4B of the yoke piece 3 to coincide with each other, The fall to the back yoke side can be suppressed.

On the other hand, FIG. 9 shows a case where the circumferential lengths of the back yoke portion 4A and the yoke piece 3 back yoke portion 4B of the magnetic pole piece 2 constituting the stator 1 of the rotating electrical machine, that is, the interval between the joints 11 are equal. Here, FIG. 9A is a cross section showing a configuration of the stator 1 of the rotating electrical machine, and FIG. 9B shows an arrangement shape at the time of winding.
In FIG. 9A, the angle formed by the joint 11 and the central axis at both ends of the pole piece 2 is θ3, and the angle formed by the joint 11 and the central axis at both ends of the yoke piece 3 is θ4. Here, the magnetic pole piece 2 and the yoke piece 3 are arranged so that θ3 = θ4.
For this reason, as shown in FIG. 9B, the back yoke portion 4A of the pole piece 2 does not exist on a part of the back surface of the insulator 9 on the back yoke side. Therefore, when the coil is wound around the teeth portion 5 of the pole piece 2 by arranging the back yoke portion 4A of the pole piece 2 so that the longitudinal direction of the back yoke portion 4B of the yoke piece 3 coincides, In the portion without the yoke portion 4A, the insulator 9 falls to the back yoke side.

Therefore, in the stator 1 of the rotating electrical machine of the first embodiment, the magnetic pole piece 2 and the yoke piece 3 are arranged so that θ1> θ2, and the back yoke portion 4A of the magnetic pole piece 2 is configured as shown in FIG. The circumferential length is made larger than the circumferential length of the yoke piece 3 back yoke part 4B.

Next, a method for manufacturing the stator of the rotating electrical machine of the first embodiment described above will be described based on the flowchart of FIG.
The method for manufacturing a stator for a rotating electrical machine according to the first embodiment is a method for manufacturing a stator 1 for a rotating electrical machine including a magnetic pole piece 2 and a yoke piece 3, and includes steps 1 to (S01) below. 3 (S03).

In the punching process of Step 1 (S01), the longitudinal direction of the back yoke portion 4A of the magnetic pole piece 2 and the longitudinal direction of the back yoke portion 4B of the yoke piece 3 are arranged so as to coincide with the rolling direction J of the electromagnetic steel sheet 31. The magnetic pole piece 2 and the yoke piece 3 are connected so as to be foldable and punched, and a predetermined number of sheets are laminated in the axial direction and fixed by caulking to form the magnetic pole piece 2 and the yoke piece 3. .

In the winding process of Step 2 (S02), the coil 10 is wound around the teeth portion 5 of the pole piece 2 using an automatic winding machine.

In the core closing step of Step 3 (S03), the linear magnetic pole piece 2 and the yoke piece 3 in which the coil 10 is wound around the teeth portion 5 of the magnetic pole piece 2 are bent into an annular shape, and the magnetic pole piece 2 and the yoke piece are then bent. The coupling convex part 7 and the coupling concave part 8 on the three end faces are fitted together, and the end faces are joined together by welding.

As described above, the first embodiment has been described by taking as an example the stator of a rotating electrical machine constituted by four magnetic pole pieces and yoke pieces, but the number of magnetic pole pieces 2 and yoke pieces 3 is not limited to four each. , 6 pieces, 8 pieces or more.
The above description has been made assuming that the magnetic pole piece 2 and the yoke piece 3 have a structure in which a plurality of thin electromagnetic steel plates are laminated along the axial direction. However, the pole piece 2 may be a block with the yoke piece 3.

Next, another configuration example will be described with reference to FIGS. For the sake of distinction, in FIG. 11, the stator 71 of the rotating electrical machine, the magnetic pole piece 72, the yoke piece 73, the back yoke portion 74A of the magnetic pole piece 72, the back yoke portion 74B of the yoke piece 73, and the teeth portion 75 of the magnetic pole piece 72. It is said. In FIG. 12, the stator 81, the magnetic pole piece 82, the yoke piece 83, the back yoke portion 84A of the magnetic pole piece 82, the back yoke portion 84B of the yoke piece 83, and the tooth portion 85 of the magnetic pole piece 82 are used.
The above is the description of the case where the number of the pole pieces and the yoke pieces is the same, that is, the case where the pole pieces and the yoke pieces are alternately arranged in an annular shape. However, as shown in FIG. 11, even when there are a plurality of yoke pieces 73 between the

pole pieces

72 and 72, that is, even when the number of yoke pieces is larger than the pole pieces, It is possible to avoid the yoke portion from interfering with the flyer of the winding machine.

FIG. 12 shows a case where there is a portion where the yoke piece 83 does not exist between the magnetic pole piece 82 and the magnetic pole piece 82. That is, even when the number of yoke pieces is small with respect to the pole pieces, it is possible to avoid the back yoke portion from interfering with the flyer of the winding machine.
From the above description, if the structure has at least a yoke piece between at least one adjacent magnetic pole piece, the portion having the yoke piece between one adjacent magnetic pole piece is separated from the turning surface of the flyer at the time of winding. Since they can be separated, it is possible to avoid the back yoke portion from interfering with the flyer of the winding machine.

As described above, the first embodiment is a stator for a rotating electrical machine including a pole piece and a yoke piece, and a method for manufacturing a stator for a rotating electrical machine including a punching process, a winding process, and a core closing process. It is about.
For this reason, the stator of the rotating electrical machine and the manufacturing method thereof according to Embodiment 1 can take a wide space between the tooth portions and avoid the back yoke portion from interfering with the flyer of the winding machine.

Embodiment 2. FIG.
The stator of the rotating electrical machine according to the second embodiment and the manufacturing method thereof perform winding work simultaneously on the teeth portions of two magnetic pole pieces using two automatic winding machines.

Hereinafter, the stator of the rotating electrical machine according to the second embodiment and the manufacturing method thereof will be described with reference to FIG. 13 that is an explanatory diagram of a winding operation and FIG. 14 that is an explanatory diagram of a winding operation of a comparative example. The difference will be mainly explained. 13 and 14, the same or corresponding parts as those in FIGS. 3 and 7 of the first embodiment are denoted by the same reference numerals. In FIG. 14, the fixing jig is omitted.

In the winding work related to the stator of the rotating electrical machine according to the first embodiment, the winding work is sequentially performed on the tooth portions 5 of the plurality of magnetic pole pieces 2 by using one automatic winding machine 21. In the winding work related to the stator of the rotating electrical machine according to the second embodiment, the winding work is simultaneously performed on the tooth portions 5 of the two magnetic pole pieces 2 by using two automatic winding machines 21.
Also in FIG. 13, for easy understanding, the left pole piece 2 is the first pole piece 2, the second pole piece 2, the third pole piece 2 and the right end pole piece 2 are the fourth pole pieces. Of the magnetic pole piece 2.

As shown in FIG. 13, the winding work is simultaneously performed on the teeth portions 5 of the two magnetic pole pieces 2 by the flyers 23 of the two automatic winding machines 21. The two automatic winding machines 21 (flyers 23) are arranged in parallel so that the respective rotation axes B coincide with the longitudinal direction of the teeth portion 5 of the magnetic pole piece 2. After the winding work of the first and third magnetic pole pieces 2 to the teeth portion 5 is finished, the two automatic winding machines 21 are simultaneously slid in the direction D, and the adjacent second and second unwinding coils are wound. The tooth portion 5 of the fourth magnetic pole piece 2 is moved to a position where the rotation axis B of the automatic winding machine 21 faces.

At this time, the winding end portion of the coil 10 wound around the teeth portion 5 of the first and third magnetic pole pieces 2 is not cut, and this is used as a connecting wire 20 for the guide pin 27 of the fixing jig 22. Along the outside. Subsequently, winding is applied to the teeth portion 5 of the second and fourth magnetic pole pieces 2 in the direction opposite to the direction wound around the tooth portions 5 of the first and third magnetic pole pieces 2. In this way, the winding work is sequentially performed on the teeth portion 5 of the pole piece 2 that is not wound.
By using the two automatic winding machines 21, the time for the winding work is greatly reduced as compared with the first embodiment.

Also, as a comparative example, it is possible to use two automatic winding machines 21 for the stator 101 of the rotating electrical machine described in the first embodiment. However, as shown in FIG. 14, in the stator 101 of the rotating electrical machine of the comparative example, the pitch E2 between the tooth portions 105 of the magnetic pole piece 102 is E1 of the pitch between the tooth portions 5 of the magnetic pole piece 2 of the stator 1 of the rotating electrical machine shown in FIG. Narrower than. For this reason, the two flyers 23 of the automatic winding machine 21 are likely to interfere with each other, and applying the simultaneous winding to the stator 101 of the rotating electrical machine is more difficult than applying it to the stator 1 of the rotating electrical machine.

In the second embodiment, since the stator 1 of the rotating electrical machine includes the tooth portions 5 of the four magnetic pole pieces 2, two automatic winding machines 21 are used. Furthermore, for a stator of a rotating electrical machine having a large number of magnetic pole piece 2 teeth 5, it is not limited to two automatic winding machines 21, but three or more automatic winding machines 21 can be applied simultaneously. it can.

As described above, the stator of the rotating electrical machine and the manufacturing method thereof according to the second embodiment perform winding work simultaneously on the teeth portions of two magnetic pole pieces using two automatic winding machines. is there. For this reason, the stator of the rotating electrical machine and the manufacturing method thereof according to Embodiment 2 can take a wide space between the tooth portions and avoid the back yoke portion from interfering with the flyer of the winding machine. Furthermore, the winding work time can be greatly reduced.

Embodiment 3 FIG.
The third embodiment is a stator of a rotating electrical machine having a structure in which a projecting portion and a recessed portion provided on a magnetic pole piece and a yoke piece are used as a connecting means in place of the thin portion on the outer periphery of the back yoke portion of the stator of the rotating electrical machine of the first embodiment. It is about.

Hereinafter, the configuration of the stator of the rotating electrical machine according to the third embodiment will be described with a focus on the difference from the first embodiment, based on FIG.
FIG. 15A is a cross-sectional view showing the configuration of the stator of the rotating electric machine according to the third embodiment, and FIG. 15B is a YY ′ cross-sectional view of FIG. 15A.
In FIG. 15, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals.
In addition, in order to distinguish from the stator 1 of the rotary electric machine of Embodiment 1, it is set as the stator 51, the magnetic pole piece 52, the yoke piece 53, each

back yoke part

54A, 54B, and the teeth part 55 of a rotary electric machine.

In the stator 1 of the rotating electrical machine of the first embodiment, the magnetic pole piece 2 and the yoke piece 3 are connected by the thin portion 6 so as to be bendable.
In the stator 51 of the rotating electrical machine of the third embodiment, the pole piece 52 and the yoke piece 53 are provided with a convex portion 57 and a concave portion 58 at circumferential end portions adjacent to each other as shown in FIG. The convex portion 57 and the concave portion 58 are connected to each other in the stacking direction so as to be connected so as to be bent.

In the stator 51 of the rotating electrical machine of the third embodiment, the handling of the magnetic pole piece 52 and the yoke piece 53 after winding the coil 10 in an annular shape is handled in the rotating electrical machine of the first embodiment using the thin portion 6 as a connecting means. Compared with the stator 1, it becomes easier. For this reason, productivity can be further improved. Further, mechanical accuracy can be improved. Furthermore, it is possible to avoid the occurrence of defects such as cracking even if bent multiple times, resulting in a decrease in magnetic characteristics due to an increase in magnetic resistance.

As described above, the third embodiment relates to a stator for a rotating electrical machine having a structure in which a convex portion and a concave portion provided on a magnetic pole piece and a yoke piece are used as connecting means for the stator of the rotating electrical machine.
For this reason, the stator of the rotary electric machine of Embodiment 3 can take a wide space between the tooth portions, and can prevent the back yoke portion from interfering with the flyer of the winding machine. Furthermore, the productivity and mechanical accuracy of manufacturing the stator of the rotating electrical machine can be improved.

Embodiment 4 FIG.
The fourth embodiment relates to a stator of a rotating electric machine having a multipolar structure in which the number of magnetic pole pieces and yoke pieces is increased as compared with the stator of the rotating electric machine of the first embodiment.

Hereinafter, the configuration of the stator of the rotating electrical machine according to the fourth embodiment will be described with a focus on differences from the first embodiment based on FIG. 16, which is a cross-sectional view showing the configuration of the stator of the rotating electrical machine.
In FIG. 16, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals.
In addition, in order to distinguish from the stator 1 of the rotary electric machine of Embodiment 1, it is set as the stator 61, the magnetic pole piece 62, the yoke piece 63, each

back yoke part

64A, 64B, and the teeth part 65 of a rotary electric machine.

The stator 61 of the rotating electrical machine in FIG. 16 has a configuration in which the number of the tooth portions 5 of the magnetic pole piece 2 is increased as compared with the stator 1 of the rotating electrical machine of the first embodiment, and the magnetic pole piece 62 and the six yoke pieces 63 are provided. It is.
By increasing the number of teeth 5 of the pole piece 2 and increasing the number of teeth, torque ripple generated in the rotating electrical machine can be reduced.

In the fourth embodiment, as an example of multipolarization, a stator 61 of a rotating electrical machine having six magnetic pole pieces 62 and six yoke pieces 63 has been described. The number of the pole pieces 62 and the yoke pieces 63 is not limited to six, and a stator for a rotating electrical machine including a larger number of the pole pieces 62 and the yoke pieces 63 can be configured.

As described above, the fourth embodiment relates to a stator for a rotating electrical machine having a multipolar structure in which the number of magnetic pole pieces and yoke pieces is increased as compared with the stator of the rotating electrical machine of the first embodiment. For this reason, the stator of the rotary electric machine of Embodiment 3 can take a wide space between the tooth portions, and can prevent the back yoke portion from interfering with the flyer of the winding machine. Furthermore, torque ripple generated in the rotating electrical machine can be reduced.

Embodiment 5 FIG.
The fifth embodiment relates to a rotating electric machine using the stator of the rotating electric machine of the first embodiment.

Hereinafter, the configuration of the rotating electrical machine of the fifth embodiment will be described based on FIG. 17 which is a cross-sectional view showing the configuration of the rotating electrical machine.
In FIG. 17, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals.

Referring to FIG. 17, description will be made by taking as an example the case of using a stator 1 of a rotating electrical machine composed of four pole pieces 2 and yoke pieces 3. In FIG. 17, the portions denoted by the same reference numerals as those in FIG. 1 of the first embodiment have the same configurations as the portions described in the first embodiment, and thus the description thereof is omitted here.

The rotating electrical machine 201 includes a stator 1 and a rotor 202 that is rotatably provided in the stator 1. The rotor 202 has a shaft 203 and a magnet 204.
The rotating electrical machine 201 has a structure in which a necessary rotational force is obtained by causing a current to flow through the coil 10 provided in the stator 1 to generate a magnetic field and rotating the rotor 202. The rotating electrical machine 201 configured as described above can take a wide space between the tooth portions 5 of the stator 1 and avoid the

back yoke portions

4A and 4B from interfering with the flyer of the winding machine. Therefore, the coil 10 can be efficiently wound around the stator 1, and the productivity of the rotating electrical machine 201 can be increased.

Here, the stator of the rotating electrical machine constituted by each of the four magnetic pole pieces and the yoke piece of the first embodiment has been described as an example. The number of pole pieces and yoke pieces is not limited to four each, and may be six, eight, or more.
Further, here, the case where the number of the pole pieces and the yoke pieces is the same is described. However, as shown in FIG. 11 of the first embodiment, when the number of the yoke pieces is large with respect to the pole pieces, or FIG. As shown in FIG. 12, the number of yoke pieces may be small with respect to the pole pieces.
Furthermore, the stator of the rotating electrical machine described in the third and fourth embodiments can also be used.

It should be noted that the present invention can be freely combined with each other within the scope of the invention, and the embodiments can be appropriately modified or omitted.

The present invention is composed of a pole piece having a back yoke portion and a tooth portion, and a yoke piece having only the back yoke portion, and can be widely applied to a stator of a rotating electrical machine because a large space can be taken between the teeth portions. .

Claims

Provided with a plurality of magnetic pole pieces and yoke pieces arranged in an annular shape,
The magnetic pole piece includes a back yoke portion disposed along the annular outer peripheral portion, and a teeth portion extending from the back yoke portion toward the annular central direction,
The yoke piece has only a back yoke portion arranged along the annular outer peripheral portion,
A stator of a rotating electrical machine having at least one yoke piece between at least a pair of adjacent magnetic pole pieces, wherein the pair of magnetic pole pieces and the yoke piece between the pair of magnetic pole pieces are foldably connected.
The angle formed by the longitudinal end faces of the back yoke portion of the magnetic pole piece with respect to the central axis is larger than the angle formed by the longitudinal end faces of the back yoke portion of the yoke piece with respect to the central axis. The stator of the rotary electric machine according to claim 1.
3. The magnetic pole piece and the yoke piece for coupling in an annular shape are provided with a coupling concave part on one end face of the magnetic pole piece and the yoke piece and a coupling convex part on the other end face. The stator of the rotary electric machine as described in 2.
The thin-walled part is provided in the outer periphery of the said back yoke part of the said magnetic pole piece, and the said back yoke part of the said yoke piece, in order to connect the said magnetic pole piece and the said yoke piece so that bending is possible. The stator of the rotary electric machine of any one of Claims.
The magnetic pole piece and the yoke piece are formed by laminating thin plates along the axial direction, and in order to connect the magnetic pole piece and the yoke piece in a foldable manner, circumferential ends of the magnetic pole piece and the yoke piece The stator of the rotary electric machine according to any one of claims 1 to 3, wherein a convex portion and a concave portion that are fitted to each other in the axial direction are provided on the portion.
A plurality of magnetic pole pieces and yoke pieces arranged in an annular shape, the magnetic pole pieces extending along the annular outer periphery, and extending from the back yoke portion toward the center of the annular shape A rotating electrical machine in which the yoke piece has only a back yoke portion arranged along the annular outer peripheral portion, and the magnetic pole pieces and the yoke pieces are alternately arranged in an annular shape. In the stator of
The pole piece and the yoke piece are connected so as to be foldable so that the longitudinal direction of the back yoke portion of the magnetic pole piece and the longitudinal direction of the back yoke portion of the yoke piece coincide with the rolling direction of the electromagnetic steel sheet. A punching process for stacking and fixing in the axial direction;
A winding step of winding a coil around the teeth portion;
A core closing step in which the magnetic pole piece and the yoke piece around which the coil is wound around the teeth portion are bent into an annular shape, the end faces to be joined together are combined, and integrated;
A method of manufacturing a stator for a rotating electrical machine.
The method of manufacturing a stator for a rotating electrical machine according to claim 6, wherein, in the winding step, the coils are wound around a plurality of the tooth portions simultaneously using a plurality of automatic winding machines.
A rotating electrical machine comprising the stator of the rotating electrical machine according to any one of claims 1 to 5 and a rotor rotatably provided in the stator of the rotating electrical machine.