JP5815336B2 - Rotating electric machine laminated iron core and method of manufacturing rotating electric machine laminated iron core - Google Patents

Description

  The present invention relates to a laminated core of a rotating electrical machine included in a rotating electrical machine used as, for example, a motor or a generator, and a method for manufacturing the laminated core of the rotating electrical machine.

  Conventionally, a stator of a rotating electrical machine in which coils are provided by concentrated winding on magnetic teeth provided respectively on a plurality of back yoke portions, and then each back yoke portion is arranged in an annular shape and the back yoke portions are connected by welding. Is known (see Patent Document 1).

  Conventionally, a plurality of back yoke parts each provided with magnetic teeth are connected by a thin connecting part, and a coil is provided on each magnetic pole tooth in a state where the connecting body of the back yoke part is linearly expanded, and then connected. There is also known a motor stator in which the body is bent into an annular shape and the ends are joined by welding (see Patent Document 2).

  Further, conventionally, the ends of a plurality of back yoke portions each provided with magnetic teeth are connected to each other by a connecting shaft so that the connecting body of the back yoke portions is developed in a linear shape or a reverse warped shape to form a coil. There is also known a stator for a rotating electrical machine in which a connecting body is rolled into an annular shape and ends thereof are joined by welding after being provided on each magnetic pole tooth. In this conventional stator, in order to fix the gap between the magnetic teeth, the outer peripheral portion in the vicinity of the connecting shaft is also welded as necessary (see Patent Documents 3 and 4).

  Further, conventionally, through holes are formed between the back yoke portions by fitting the end portions of a plurality of back yoke portions each provided with magnetic teeth, and the back yoke portion is inserted into the through holes. A stator in which the gaps are connected is also known (see Patent Document 5).

Japanese Patent No. 3355700 Japanese Patent No. 3681487 Japanese Patent No. 3379461 Japanese Patent No. 3625185 JP 2007-20242 A

  However, in the conventional stators disclosed in Patent Documents 1 to 4, the back yoke portions are welded in order to maintain a state in which the magnetic teeth are arranged in an annular shape. Therefore, the stator is distorted by welding and, for example, cogging and torque ripple are easily generated, and the characteristics of the rotating electrical machine are deteriorated.

  Further, in the conventional stator shown in Patent Document 5, due to manufacturing errors of the back yoke portion, even if the end portions of the back yoke portion are fitted together, a part of the through hole may be displaced, In this case, it becomes impossible to insert the needle-like member into the through-hole, or even if the needle-like member can be inserted into the through-hole, the needle-like member easily falls out of the through-hole. I'll be relaxed. Therefore, it takes time to manufacture the stator.

  The present invention has been made to solve the above-described problems, and can provide a laminated iron core for a rotating electrical machine that can suppress the occurrence of distortion and can be easily manufactured. It aims at obtaining the manufacturing method of this.

A laminated iron core of a rotating electrical machine according to the present invention includes a core body configured by having a plurality of core blocks configured by laminating a plurality of core pieces in an axial direction and connecting each core block in an annular shape. In addition, at least one of the connecting portions of the core blocks has a connecting end provided on the core piece of one core block and an connecting end provided on the core piece of the other core block in the axial direction. The connecting end portions that are alternately overlapped with each other and are connected to each other so as to be rotatable about the connecting shaft are open to the outer peripheral side of the core body. In addition, a recess for forming a locking groove is provided by being arranged in the axial direction, and a rotation prevention pin for preventing rotation of the core blocks around the connecting shaft is inserted in the locking groove. .
The laminated core of the rotating electrical machine according to the present invention has a plurality of core blocks formed by laminating a plurality of core pieces in the axial direction, and is formed by connecting each core block in an annular shape. And at least one of the connecting portions between the core blocks connects the core blocks in a state where the flange portion provided in one core block is inserted into the joint groove provided in the other core block. The opening of the joint groove is provided with a stop portion that protrudes from the side surface of the joint groove to the inside of the joint groove. The flange portion avoids the stop portion and is connected to the joint groove from the core block. A protrusion that protrudes inward, and an engagement portion that extends in a bent manner from the tip of the protrusion, and that faces the stop portion in the joint groove. Between the stop portion and the engagement portion, , To prevent the flange from coming out of the joint groove Out prevention pin is inserted.

The method of manufacturing a laminated core of a rotating electrical machine according to the present invention includes a core body manufacturing step of manufacturing an iron core body in which core blocks are connected in a ring shape and at least one of the connecting parts of the core blocks is a rotating connection part, An alignment step of rotating the core blocks around the connecting shaft to align the positions of the concave portions with the positions aligned in the axial direction to form a locking groove, and a rotation prevention pin at the opening of the locking groove A rotation prevention pin inserting step of inserting the rotation prevention pin into the locking groove by pressing from the outside in the radial direction is provided.
In addition, the method for manufacturing a laminated core of a rotating electrical machine according to the present invention is a method of manufacturing a core body in which core blocks are connected in a ring shape, and at least one of the connecting portions of the core blocks is an engagement connecting portion. And a removal prevention pin inserting step of inserting a removal prevention pin into a space between the step and the engaging portion of the flange portion and the stopper provided in the opening of the joint groove.

  According to the laminated core of the rotating electrical machine and the method of manufacturing the laminated core of the rotating electrical machine according to the present invention, the shape of the core body can be held in an annular shape without using welding, and the occurrence of distortion due to welding can be prevented. it can. Thereby, generation | occurrence | production of the distortion of the laminated iron core of a rotary electric machine can be suppressed. Moreover, manufacture of a laminated iron core can be made easy.

It is a top view which shows the rotary electric machine by Embodiment 1 of this invention. It is a top view which shows the stator core of FIG. It is a top view which shows the state which divided | segmented the iron core main body of FIG. It is an enlarged view which shows the principal part of the iron core main body of FIG. It is an enlarged view which shows the principal part of the stator of FIG. It is a top view which shows the 1st core piece arrangement | sequence layer and 2nd core piece arrangement | sequence layer which are contained in the core block coupling body of FIG. It is an enlarged view which shows the connection part of the core blocks of FIG. It is a top view which shows the state which expand | deployed the core block coupling body of FIG. 3 linearly. It is an enlarged view which shows the connection part of the core blocks of FIG. It is a top view which shows the principal part of the stator by Embodiment 2 of this invention. It is an enlarged view which shows the rotation connection part of the core blocks of FIG. It is a top view which shows the principal part of the stator 3 by Embodiment 3 of this invention. It is a top view which shows the state which expand | deployed the core block coupling body of the stator core of FIG. It is an enlarged view which shows the rotation connection part of the core blocks of FIG. FIG. 10 is a plan view showing a first core piece arrangement layer and a second core piece arrangement layer used for manufacturing the stator core according to the third embodiment.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a plan view showing a rotary electric machine according to Embodiment 1 of the present invention. In the figure, the rotating electrical machine 1 includes a rotor 2, a cylindrical stator 3 that surrounds the outer periphery of the rotor 2, and a housing 4 that supports the rotor 2 and the stator 3.

  The rotor 2 is rotatable with respect to the stator 3 about the axis of the rotating electrical machine 1. The rotor 2 includes a columnar rotor core 5 and a plurality of permanent magnets 6 fixed to the outer peripheral surface of the rotor core 5 and arranged in the circumferential direction of the rotor core 5.

  The stator 3 is arranged coaxially with the rotor 2. The stator 3 includes a stator core (laminated core) 7 that surrounds the outer periphery of the rotor 2, and a plurality of drives that are provided on the stator core 7 and arranged at intervals in the circumferential direction of the stator core 7. A coil 8 and an insulator 9 provided on the stator core 7 and interposed between the stator core 7 and each drive coil 8 are provided.

  FIG. 2 is a plan view showing the stator core 7 of FIG. In the figure, the stator core 7 has a core body 11 including a plurality (18 in this example) of core blocks 10 connected in an annular shape. Each core block 10 includes a flat back yoke portion 12 and a magnetic pole tooth portion 13 that protrudes from an intermediate portion of the back yoke portion 12. The iron core body 11 is configured by sequentially connecting the back yoke portions 12 in an annular shape with the magnetic pole teeth portions 13 facing inward.

  As shown in FIG. 1, the drive coil 8 is provided for each core block 10 by winding a conductive wire (magnet wire) around the magnetic pole tooth portion 13 via the insulator 9 in a concentrated manner.

  FIG. 3 is a plan view showing a state where the core body 11 of FIG. 2 is divided. In the drawing, an iron core body 11 includes ends of a plurality of (in this example, two) core block coupling bodies 14 configured by sequentially connecting a plurality of (in this example, nine) core blocks 10 so as to be rotatable. It is formed in an annular shape by connecting the parts.

  On the end surface of the back yoke portion 12 of the core block 10 located at one end of each core block coupling body 14, a flange portion (tenon portion) 21 is provided. A joint groove 22 into which the flange portion 21 is inserted is provided on the end surface of the back yoke portion 12 of the core block 10 located at the other end of each core block coupling body 14.

  The core block 10 provided with the flange 21 and the core block 10 provided with the joint groove 22 are connected to each other in a state where the flange 21 is inserted into the joint groove 22. That is, among the connecting portions between the core blocks 10 in the core body 11, the connecting portions between the core blocks 10 positioned at the end of each core block connecting body 14 are in a state where the flange portion 21 is inserted into the joint groove 22. The engagement connecting portion is formed by connecting the core blocks 10 to each other.

  A stop portion 23 that protrudes from the side surface of the joint groove 22 to the inside of the joint groove 22 is provided at the opening of the joint groove 22. Thereby, the width dimension of the opening part of the joint groove 22 is narrower than the width dimension in the joint groove 22.

  The flange portion 21 has a protruding portion 21a protruding from the end surface of the back yoke portion 12, and an engaging portion 21b extending so as to be bent from the tip end portion of the protruding portion 21a.

  FIG. 4 is an enlarged view showing a main part of the core body 11 of FIG. FIG. 5 is an enlarged view showing a main part of the stator 3 of FIG. In the state in which the flange portion 21 is inserted into the joint groove 22, as shown in FIG. 4, the protruding portion 21 a is inserted into the joint groove 22 avoiding the stop portion 23, and the engaging portion 21 b is inserted into the joint groove 22. Opposite to the stop 23. Further, in the state where the flange portion 21 is inserted into the joint groove 22 and the end surfaces of the back yoke portion 12 are in contact with each other, as shown in FIG. 4, there is a gap between the bottom surface of the joint groove 22 and the engaging portion 21b. (Space) G exists.

  As shown in FIG. 5, a metal rod-shaped detachment prevention pin 24 that prevents the flange portion 21 from being detached from the joint groove 22 is inserted into the space between the engagement portion 21 b and the stopper portion 23. Yes. Thereby, the engaging part 21b is engaged with the stop part 23 via the disengagement prevention pin 24, and the core blocks 10 are firmly connected to each other. Further, since there is a gap G between the bottom surface of the joint groove 22 and the engaging portion 21b, elastic deformation of the engaging portion 21b in a direction away from the stopping portion 23 is allowed, and the engaging portion 21b and the stopping portion 23 It becomes easy to insert the anti-disengagement pin 24 into the space between the two.

  Each core block 10 is configured by stacking a plurality of core pieces formed by punching steel plates in the axial direction. The core block connector 14 is formed by alternately stacking a first core piece array layer and a second core variable array layer in which a plurality of core pieces are arranged in the axial direction.

  FIG. 6 is a plan view showing the first core piece arrangement layer 31 and the second core piece arrangement layer 32 included in the core block connector 14 of FIG. 3, and FIG. 6 (a) is the first core piece. FIG. 6B is a diagram showing the arrangement layer 31, and FIG. 6B is a diagram showing the second core piece arrangement layer 32. In the figure, the metal core pieces 33 arranged in the first and second core piece arrangement layers 31 and 32 protrude from the back yoke constituting portion 34 constituting the back yoke portion 12 and the back yoke constituting portion 34. , A substantially T-shaped plate having a magnetic tooth constituent part 35 constituting the magnetic tooth part 13.

  One end of the back yoke component 34 is provided with a connecting end 34 a that projects in the length direction of the back yoke component 34, and the other end of the back yoke component 34 has the back yoke component 34. A recess 34b that is recessed in the length direction is provided.

  In the first and second core piece arrangement layers 31 and 32, a plurality of core pieces 33 are arranged at a predetermined pitch angle so that the connecting end portion 34a and the recessed portion 34b face each other in the circumferential direction. Further, the direction of the connecting end portion 34a of the core pieces 33 arranged in the first core piece arrangement layer 31 (FIG. 6A) and the core pieces 33 arranged in the second core piece arrangement layer 32 are arranged. The direction of the connecting end 34a (FIG. 6B) is opposite to each other.

  The 1st and 2nd core piece arrangement | sequence layers 31 and 32 are laminated | stacked by matching the position of each magnetic pole teeth structure part 35 about an axial direction. Thereby, the connection end 34a of the core piece 33 arranged in the first core piece arrangement layer 31 and the connection end 34a of the core piece 33 arranged in the second core piece arrangement layer 32 are provided. The first and second core piece arrangement layers 31 and 32 are stacked in a state of being alternately overlapped in the axial direction. The core pieces 33 stacked in the axial direction are integrated by a caulking portion 36 in which a concave portion formed on one of the overlapping core pieces 33 and a convex portion formed on the other are fitted to each other to form the core block 10. It is composed.

  A connecting shaft 37 that protrudes in the axial direction is provided on the surface of the connecting end 34 a of each core piece 33, and a recess in which the connecting shaft 37 is fitted is provided on the back surface of the connecting end 34 a of each core piece 33. Yes. The connecting end portions 34a that overlap each other rotate around the connecting shaft 37 in a state in which the connecting shaft 37 provided in one connecting end portion 34a is fitted in the recess provided in the other connecting end portion 34a. Connected as possible. That is, the connecting portion between the core blocks 10 in the core block connecting body 14 is provided in the connecting end portion 34 a provided in the core piece 33 of one core block 10 and the core piece 33 of the other core block 10. The connecting end portions 34a are alternately overlapped in the axial direction, and the connecting end portions 34a that overlap each other are connected to each other so as to be rotatable about the connecting shaft 37. That is, the core block connector 14 is a joint-connected iron core (joint wrap iron core).

  Each of the connecting end portions 34 a of each core piece 33 is formed with a recess 38 that opens to the outer peripheral side of the core body 11. The recess 38 is provided on the outer side in the radial direction than the connecting shaft 37. Moreover, the recessed part 38 is arrange | positioned on the straight line K along the radial direction which passes along the central axis C of the stator core 7, and the axis line of the connection shaft 37, as shown in FIG.2 and FIG.4.

  FIG. 7 is an enlarged view showing a connecting portion between the core blocks 10 of FIG. As shown in FIG. 7, the width dimension W of the opening of the recess 38 is smaller than the maximum width dimension D in the recess 38 (W <D). In this example, the recess 38 has a substantially C-shaped cross section. The cross-sectional shape of the recess 38 is not limited to a substantially C shape, and may be a trapezoidal shape, for example.

  In the rotation connecting portion in which the core blocks 10 are connected to each other so as to be rotatable around the connection shaft 37, the amount of rotation between the core blocks 10 is adjusted, and the core block connecting body 14 has an arc shape. The positions of the recesses 38 are arranged in the axial direction, and a locking groove is formed along the axial direction by the plurality of recesses 38 arranged in the axial direction.

  A metal rod-shaped anti-rotation pin 41 that prevents the rotation of the core blocks 10 around the connecting shaft 37 is inserted into the locking groove formed by the plurality of recesses 38 aligned in the axial direction. Yes. Thereby, rotation of the core blocks 10 is prevented, and the core block coupling body 14 is maintained in an arcuate state.

  In other words, in this example, of the connecting portions of the core blocks 10 included in the core body 11 formed in an annular shape, two connecting portions are inserted into the joint groove 22 of the flange portion 21 to each other. The other connecting portion is a rotating connecting portion that connects the core blocks 10 via the connecting shaft 37.

  Next, a method for manufacturing the stator 3 will be described. First, the first core piece arrangement layer 31 (FIG. 6A) and the second core piece arrangement layer 32 in which a plurality of core pieces 33 are arranged at a predetermined angular pitch by punching a steel plate with a die punch. (FIG. 6B) is prepared. Thereafter, by alternately laminating and pressing the first core piece arrangement layer 31 and the second core piece arrangement layer 32, as shown in FIG. Two linked core block linked bodies 14 are fabricated (core block linked body fabricating step).

  After that, as shown in FIG. 8, the core block connector 14 is linearly expanded in a direction in which the interval between the magnetic teeth portions 13 is widened, and a conductive wire is wound around the magnetic teeth portions 13 via the insulators 9. A drive coil 8 is provided in the core block 10. At this time, as shown in FIG. 9, the position of the recess 38 of each core piece 33 is shifted from each other when viewed along the axial direction, and no locking groove is formed. At this time, in order to make it easier to wind the conductive wire, the core block connector 14 may be expanded to a reverse warped state in a direction in which the interval between the magnetic pole teeth portions 13 is further increased (driving coil mounting step).

  Thereafter, the core blocks 10 are rotated around the connecting shaft 37 to return the unfolded state of each core block connecting body 14, and the flange portion 21 is inserted into the joint groove 22 to form the engaging connecting portion. The ends of each core block connector 14 are connected to each other. Thereby, the iron core main body 11 in which the plurality of core blocks 10 are annularly connected by the rotation connecting portion and the engaging connecting portion is manufactured (iron core main body manufacturing step).

  Thereafter, the amount of rotation of the core blocks 10 around the connecting shaft 37 is adjusted to make the core body 11 into an annular shape, so that the positions of the recesses 38 are aligned with the positions aligned in the axial direction. A locking groove is formed on the outer periphery (positioning step).

  Thereafter, the rotation prevention pin 41 is applied to the locking groove formed in the alignment step, and the rotation prevention pin 41 is pressed from the radially outer side to the opening of the locking groove, as shown in FIG. Then, the rotation prevention pin 41 is inserted into the locking groove. Thereby, rotation of the core blocks 10 is prevented (rotation prevention pin insertion step).

  Further, in the engagement connecting portion between the core blocks 10, as shown in FIG. 5, the disengagement prevention pin 24 is inserted into the space between the engagement portion 21 b of the flange portion 21 and the stop portion 23 provided in the joint groove 22. Is inserted, and the collar portion 21 is engaged with the stopper portion 23 via the detachment prevention pin 24. Thereby, it is prevented that the collar part 21 remove | deviates from the inside of the joint groove | channel 22, and the edge parts of the core block coupling body 14 are connected firmly (separation prevention pin insertion process). In this way, the stator core 7 is manufactured.

  In such a stator core 7 of a rotating electrical machine, as a connecting portion between the core blocks 10, a connecting end portion 34 a provided on the core piece 33 of one core block 10 and a core piece 33 of the other core block 10. The connecting end portions 34a provided on the connecting portions 34a are alternately overlapped in the axial direction, and the connecting end portions 34a are connected to each other so as to be rotatable about the connecting shaft 37. A recess 38 opened to the outer peripheral side of the core body 11 is provided in each connecting end 34a, and a rotation prevention pin 41 is inserted into a locking groove formed by a plurality of recesses 38 arranged in the axial direction. Therefore, the rotation prevention pins 41 and the recesses 38 can be engaged with each other to prevent the rotation of the core blocks 10. Thereby, the shape of the core body 11 can be held in an annular shape without using welding, and the occurrence of distortion due to welding can be prevented. Therefore, the generation of distortion can be suppressed as a whole of the stator core 7, and the generation of cogging torque, torque ripple, and the like can be suppressed. Further, since the shape of the core body 11 can be held in an annular shape simply by inserting the rotation prevention pin 41 into the locking groove, the stator core 7 can be easily manufactured.

  Further, since the recess 38 is open to the outer peripheral side of the core body 11, the rotation prevention pin 41 is inserted into the locking groove formed by the plurality of recesses 38 arranged in the axial direction from the outside in the radial direction of the core body 11. can do. Thereby, even if it is a case where the position of each recessed part 38 has shifted | deviated a little by the manufacturing error, the rotation prevention pin 41 can be easily inserted in an engaging groove from the opening part of an engaging groove.

  Moreover, since the width dimension W of the opening part of the recessed part 38 is smaller than the maximum width dimension D in the recessed part 38, it is possible to make it difficult for the rotation preventing pin 41 to come out of the locking groove.

  In addition, as a connecting portion between the core blocks 10, an engaging connecting portion in which the flange portion 21 provided in one core block 10 is inserted into the joint groove 22 provided in the other core block 10 is used. A stop portion 23 protruding from the side surface of the joint groove 22 to the inside of the joint groove 22 is provided in the opening portion of the joint groove 22, and the engaging portion 21 b and the stop portion of the flange portion 21 facing the stop portion 23 in the joint groove 22. Since the detachment prevention pin 24 is inserted between the detachment prevention pin 24 and the detachment prevention pin 24, the flange portion 21 can be engaged with the stop portion 23 via the detachment prevention pin 24. Can be prevented. Thereby, the shape of the core body 11 can be held in an annular shape without using welding, and the occurrence of distortion due to welding can be prevented. Therefore, the generation of distortion can be suppressed as a whole of the stator core 7, and the generation of cogging torque, torque ripple, and the like can be suppressed. Further, the shape of the iron core body 11 is held in an annular shape simply by inserting the flange portion 21 into the joint groove 22 and inserting the disengagement prevention pin 24 between the engaging portion 21b and the stopper portion 23 of the flange portion 21. Therefore, manufacture of the stator core 7 can be facilitated.

  Further, since a gap (space) exists between the bottom surface of the joint groove 22 and the engaging portion 21b of the flange portion 21, for example, the distance between the stopper portion 23 and the engaging portion 21b is caused by a manufacturing error or the like. The direction in which the engaging portion 21b is pushed by the disengagement prevention pin 24 inserted between the engaging portion 21b and the stop portion 23 and is separated from the stop portion 23 even if the diameter of the disengagement prevention pin 24 is narrow. The engagement portion 21b can be elastically deformed, and the disengagement prevention pin 24 can be easily inserted between the stopper portion 23 and the engagement portion 21b. Accordingly, the manufacture of the stator core 7 can be further facilitated.

  Further, according to such a method of manufacturing the stator core 7, the core blocks 10 are rotated around the connecting shaft 37, and the locking grooves are formed so that the positions of the recesses 38 are aligned with the positions aligned in the axial direction. The rotation prevention pin 41 is pressed from the outside in the radial direction to the opening of the locking groove, and the rotation prevention pin 41 is inserted into the locking groove, so that the shape of the core body 11 can be formed without using welding. It can hold | maintain to an annular | circular shape and generation | occurrence | production of the distortion by welding can be prevented. Therefore, the generation of distortion can be suppressed as a whole of the stator core 7, and the generation of cogging torque, torque ripple, and the like can be suppressed. Further, since the anti-rotation pin 41 is inserted into the locking groove from the outside in the radial direction, even if the position of each recess 38 is slightly shifted due to a manufacturing error, the locking groove 41 is inserted into the locking groove from the opening of the locking groove. The rotation prevention pin 41 can be easily inserted into the.

  Further, after inserting the flange portion 21 into the joint groove 22, the disengagement prevention pin 24 is inserted into the space between the engaging portion 21 b of the flange portion 21 and the stopper portion 23 provided at the opening portion of the joint groove 22. Therefore, the shape of the iron core body 11 can be held in an annular shape without using welding, the occurrence of distortion due to welding can be prevented, and the manufacture of the stator iron core 7 can be facilitated.

Embodiment 2. FIG.
FIG. 10 is a plan view showing a main part of stator 3 according to the second embodiment of the present invention, and corresponds to FIG. 5 of the first embodiment. FIG. 11 is an enlarged view showing a rotation connecting portion between the core blocks 10 of FIG. In the figure, one notch 51 is provided on each of the left and right sides of each recess 38 provided in each coupling end 34a that overlaps each other. Thus, a pair of walls 52 that form the respective side surfaces of the recesses 38 are formed between the notches 51 and the recesses 38. By providing the notch 51 on the back side of the wall 52 when viewed from the recess 38, elastic deformation of the wall 52 in the direction in which the width dimension of the recess 38 increases is allowed. Other configurations are the same as those in the first embodiment.

  In such a stator core 7, the notches 51 that allow elastic deformation of the wall 52 that forms the side surface of the recess 38 are provided on both sides of the recess 38. The wall 52 is easily elastically deformed by being pushed by the prevention pin 41, and the rotation prevention pin 41 can be easily inserted into the engagement groove even if the position of each recess 38 forming the engagement groove is slightly shifted due to, for example, a manufacturing error. Can be inserted into. Accordingly, the manufacture of the stator core 7 can be further facilitated.

  In the above example, the notches 51 are provided on the left and right sides of the recess 38, respectively, but the notches 51 may be provided only on one side of the recess 38. Even in this case, elastic deformation of the wall formed between the notch 51 and the recess 38 can be allowed, and the rotation prevention pin 41 can be easily inserted into the locking groove.

Embodiment 3 FIG.
FIG. 12 is a plan view showing a main part of stator 3 according to the third embodiment of the present invention, and corresponds to FIG. 5 of the first embodiment. In the figure, the shape of the outer peripheral surface 61 provided with the recess 38 of each connecting end 34 a is an arc with the same radius centered on the connecting shaft 37. In addition, a pair of inclined surfaces 62 extending from the arc-shaped outer peripheral surface 61 of the connecting end portion 34 a and symmetrically formed with respect to a plane including the axis of the connecting shaft 37 are provided on the outer peripheral portions of the adjacent back yoke portions 12. It has been. Accordingly, the pair of inclined surfaces 62 are formed on both sides of the recess 38 when viewed along the axial direction of the connecting shaft 37.

  FIG. 13 is a plan view showing a state where the core block connector 14 of the stator core 7 of FIG. 12 is developed. FIG. 14 is an enlarged view showing a rotation connecting portion between the core blocks 10 of FIG. In FIG. 13 and FIG. 14, the core block connector 14 is expanded in a straight line with the magnetic pole teeth 13 being substantially parallel. In the state where the core block connector 14 is deployed, the positions of the recesses 38 when viewed along the axial direction of the connecting shaft 37 are shifted from each other as shown in FIG. On the other hand, the angle θ formed between each of the one and the other inclined surfaces 62 formed on both sides of the recess 38 and the plane including the axis of the connecting shaft 37 is such that the core blocks 10 rotate around the connecting shaft 37. Are kept the same as shown in FIG. Further, the arcuate outer peripheral surface 61 of each connecting end 34a when viewed along the axial direction of the connecting shaft 37 is shown in FIG. 14 even if the core blocks 10 are rotated about the connecting shaft 37. As shown, they are moved on a common circle without crossing each other. Other configurations are the same as those in the first embodiment.

  Next, a method for manufacturing the stator core 7 according to Embodiment 3 will be described. FIG. 15 is a plan view showing a first core piece arrangement layer 31 and a second core piece arrangement layer 32 used for manufacturing the stator core 7 according to the third embodiment, and FIG. FIG. 15B is a view showing the second core piece arrangement layer 31, and FIG. 15B is a view showing the second core piece arrangement layer 31. When the stator core 7 is manufactured, the first core piece arrangement layer 31 and the second core piece arrangement layer 32 are respectively produced by punching a steel plate with a die punch. The core pieces 33 are not arranged in a predetermined angular pitch, but are punched out in a state where a plurality of core pieces 33 are arranged in a straight line as shown in FIG. 32 are prepared.

  Here, the arc-shaped outer peripheral surface 61 provided with the concave portions 38 of the respective connecting end portions 34 a is located on a common circle, and the pair of inclined surfaces 62 formed on both sides of the concave portions 38 are the axis of the connecting shaft 37. As shown in FIG. 15, it is possible to punch a steel plate with the same mold punch 71 when the first and second core piece arrangement layers 31 and 32 are respectively produced. become. The subsequent manufacturing procedure is the same as in the first embodiment.

  In such a stator core 7, the shape of the outer peripheral surface 61 provided with the recesses 38 of the respective connecting end portions 34 a is an arc shape centered on the connecting shaft 37. Even if the connecting end portions 34a rotate, it is possible to avoid the outer peripheral surfaces 61 of the connecting end portions 34a from crossing each other when viewed along the axial direction of the connecting shaft 37. As a result, when the first core piece arrangement layers 31 and the second core piece arrangement layers 32 are alternately stacked and pressed, the burr or sagging formed on the connecting end 34a causes the gaps between the core pieces 33. It is possible to prevent the stacking gap from changing. Therefore, the assembly accuracy of the stator core 7 can be improved, and the occurrence of cogging torque, torque ripple, and the like can be further suppressed. Further, when the core blocks 10 are rotated, it is possible to avoid burrs or sagging between the connecting end portions 34a, so that the force when the core block connector 14 is expanded or rolled is reduced. be able to.

  Further, in addition to the shape of the outer peripheral surface 61 provided with the recess 38 of each connecting end 34 a being an arc, a pair of inclined surfaces formed symmetrically with respect to the plane including the axis of the connecting shaft 37. 62 is provided on the outer peripheral portion of the back yoke portion 12 adjacent to each other, so that the outer peripheral portions of the first core piece arrangement layer 31 and the second core piece arrangement layer 32 are formed by a common die punch 71. Thus, the productivity of the first and second core piece arrangement layers 31 and 32 can be improved. Moreover, since the core pieces 33 can be punched out in a linear arrangement, the material yield can be improved.

  In the above example, the pair of inclined surfaces 62 formed symmetrically with respect to the plane including the axis of the connecting shaft 37 are formed in a circular arc shape on the outer peripheral surface provided with the concave portion 38 of each connecting end 34a. Although the structure provided in the outer peripheral part of the adjacent back yoke part 12 is applied to the structure of Embodiment 1, these structures may be applied to the structure of Embodiment 2.

  Moreover, in each said embodiment, although two connection parts are made into the engagement connection part among the connection parts of the core blocks 10, the number of engagement connection parts may be one. Three or more may be sufficient. Moreover, it is good also considering all the connection parts of core blocks 10 as an engagement connection part.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 7 Stator core (laminated core), 10 Core block, 11 Iron core body, 21 Gutter part, 21a Protruding part, 21b Engaging part, 22 Joint groove, 23 Stop part, 24 Detachment prevention pin, 33 Core piece 34a, connection end, 37 connection shaft, 38 recess, 41 rotation prevention pin, 51 notch, 52 wall, 61 outer peripheral surface.

Claims (7)

It has a plurality of core blocks configured by laminating a plurality of core pieces in the axial direction, and includes an iron core body configured by connecting each of the core blocks in a ring shape,
At least one of the connecting portions of the core blocks includes a connecting end portion provided on the core piece of one core block and a connecting end portion provided on the core piece of the other core block. Are alternately connected to each other in the axial direction, and the connecting end portions that overlap each other are connected to each other so as to be rotatable about the connecting shaft.
Each of the connecting end portions is provided with a recess that is open to the outer peripheral side of the core body and forms a locking groove by being aligned in the axial direction.
A laminated iron core of a rotating electrical machine in which a rotation prevention pin for preventing rotation of the core blocks around the connecting shaft is inserted into the locking groove.   The laminated iron core for a rotating electrical machine according to claim 1, wherein a notch that allows deformation of a wall that forms a side surface of the recess is provided on a side of the recess.   The laminated core of the rotating electrical machine according to claim 1 or 2, wherein a shape of an outer peripheral surface in which the concave portion is provided in each of the connection end portions is an arc shape centering on the connection shaft. Of the connecting portions between the core blocks, the connecting portion different from the rotating connecting portion is a state in which the flange portion provided in one of the core blocks is inserted into the joint groove provided in the other core block. And, it is an engagement connecting part that connects the core blocks,
The opening of the joint groove is provided with a stopper that protrudes from the side surface of the joint groove to the inside of the joint groove.
The flange extends from the core block so as to avoid the stopper and protrudes from the core block into the joint groove, and is bent from the tip of the protrusion, and faces the stopper in the joint groove. An engaging portion,
The rotation according to any one of claims 1 to 3, wherein a disengagement prevention pin is inserted between the stopper portion and the engaging portion to prevent the flange portion from coming off from the joint groove. Electric laminated iron core. A method for producing a laminated core of a rotating electrical machine for producing the laminated core of a rotating electrical machine according to any one of claims 1 to 4,
The core body manufacturing step of manufacturing the core body in which the core blocks are connected in a ring shape, and at least one of the connecting parts of the core blocks is the rotating connection part,
An alignment step of rotating the core blocks around the connecting shaft to align the positions of the recesses with the positions aligned in the axial direction to form the locking grooves, and opening the locking grooves A method for manufacturing a laminated core of a rotating electrical machine, comprising: a rotation prevention pin insertion step of pressing the rotation prevention pin from the outside in the radial direction and inserting the rotation prevention pin into the locking groove. It has a plurality of core blocks configured by laminating a plurality of core pieces in the axial direction, and includes an iron core body configured by connecting each of the core blocks in a ring shape,
At least one of the connecting portions between the core blocks is a state in which the flanges provided in one of the core blocks are inserted into the joint grooves provided in the other core block, and the core blocks are connected to each other. It is an engagement connecting part to connect,
The opening of the joint groove is provided with a stopper that protrudes from the side surface of the joint groove to the inside of the joint groove.
The flange extends from the core block so as to avoid the stopper and protrudes from the core block into the joint groove, and is bent from the tip of the protrusion, and faces the stopper in the joint groove. An engaging portion,
A detachment prevention pin is inserted between the stopper and the engaging portion to prevent the flange from coming off from the joint groove .
A laminated core of a rotating electrical machine in which a space allowing elastic deformation of the engaging portion exists between the bottom surface of the joint groove and the engaging portion . A method for producing a laminated core of a rotating electrical machine for producing a laminated core of a rotating electrical machine according to claim 6 ,
The core body manufacturing step of manufacturing the core body in which the core blocks are connected in a ring shape, and at least one of the connecting portions of the core blocks is the engagement connecting portion, and the engaging portion of the flange portion And a detachment prevention pin inserting step of inserting the detachment prevention pin into a space between the joint groove and the stopper provided in the opening of the joint groove.

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