JP4709114B2 - Stator for rotating electrical machine - Google Patents

Description

  The present invention relates to a stator used in a rotating electric machine, and more particularly to a structure of a laminated iron core constituting the stator.

  In a conventional stator for a rotating electric machine, a plurality of magnetic pole pieces having a back yoke portion and a teeth portion protruding from the back yoke portion are bent via a joint portion in order to wind the winding with high density. There is a connection body that is connected to each other as possible, and a plurality of the connection bodies are stacked in the thickness direction to form a stacked iron core (for example, see Patent Document 1).

  And, when forming a stator for a rotating electrical machine, conventionally, after winding a winding around a tooth portion of each laminated iron core, the joint portion is bent to form a cylindrical shape, and the end faces of the laminated iron cores Are aligned with each other, and the end surfaces abutted by welding means such as TIG welding are fixed and integrated from the outer peripheral side of each laminated core.

JP-A-9-191588

  By the way, as in the prior art, in order to constitute a stator for a rotating electrical machine, the end faces of the laminated iron cores face each other by welding means such as TIG welding from the outer peripheral side of each laminated iron core. If the core is fixed, a part of the iron core near the end face abutted by the heat of welding is deformed. As a result, the accuracy of the inner diameter of the laminated core is deteriorated, and there is a problem that the gap with the rotor varies in the circumferential direction.

  Further, there are cases where welding conditions vary due to dirt on the surface of the laminated iron core, and sufficient fixing strength cannot be obtained. Furthermore, since it is necessary to use an expensive welding apparatus, there is a problem that capital investment is required and the product unit price increases.

  In addition, it is also possible to fix using an adhesive instead of welding the butt end faces to each other, but when using such an adhesive, the adhesive strength becomes insufficient due to contamination of the butt end faces of the laminated iron core. In addition, the reliability is insufficient because the adhesive strength deteriorates due to aging of the adhesive.

  The present invention has been made to solve the above-described problems, and can ensure the accuracy of the inner diameter of the laminated iron core, and can easily and surely fix and integrate the end faces to which the laminated iron cores are abutted. An object of the present invention is to provide a stator for a rotating electrical machine that is highly reliable and can be manufactured at low cost.

  In order to achieve the above object, according to the present invention, a coupling body in which a plurality of magnetic pole pieces having a back yoke portion and teeth portions protruding from the back yoke portion are connected via a joint portion so as to be bendable. A plurality of the connected bodies are laminated in the thickness direction to form a laminated iron core, the joint portion of the laminated iron core is bent and formed into a cylindrical shape, and the end faces that are abutted to each other are fixed to each other The following structure is adopted in the stator for a rotating electrical machine thus formed.

  That is, in the present invention, a concave portion and a convex portion fitted to each of the coupling bodies are provided on the end surfaces of the laminated core that are abutted with each other, and the concave portion and the convex portion are formed from the lamination direction. A first fitting form that is a combination of shapes that allow fitting but not fitting from the circumferential direction, and a second fitting that is a combination of shapes that allow fitting from both the circumferential direction and the stacking direction Each of the coupling bodies is laminated so that the first fitting form and the second fitting form are alternately generated by a predetermined number along the lamination direction. The end surfaces of the laminated iron core are integrally connected by the fitting of the concave portion and the convex portion that are arranged and are in the first fitting form.

  According to the present invention, since the end surfaces of the laminated core that are abutted with each other are integrally joined by fitting the concave portion and the convex portion constituting the first fitting form, conventional welding and adhesion are unnecessary. is there. For this reason, the inner diameter accuracy of the laminated iron core can be ensured, and the end faces can be fixed easily and reliably, so that there is provided a stator for a rotating electrical machine that is highly reliable and can be manufactured at low cost. can do.

Embodiment 1 FIG.
1 is a perspective view showing a state in the middle of assembling a laminated core of a stator for a rotating electric machine according to Embodiment 1 of the present invention, FIG. 2 is a plan view showing a state in which the laminated core is bent and formed into a cylindrical shape, and FIG. It is a top view which shows the state which couple | bonded end surfaces and assembled the laminated iron core.

  The stator for a rotating electrical machine according to the first embodiment includes a laminated iron core 1, and the laminated iron core 1 has a plurality of (in this example) a back yoke portion 21 and teeth portions 22 protruding from the back yoke portion 21. Nine) magnetic pole pieces 20 each have a connecting body 2 that is foldably connected via a thin joint portion 23, and a plurality (38 in this example) of the connecting bodies 2 are laminated in the thickness direction. Has been configured. The number of the pole pieces 20 and the number of stacked layers of the coupling bodies 2 are merely examples, and the present invention is not limited to such numbers.

  Further, each connecting body 2 constituting the laminated core 1 is provided with a concave portion 24 on one side of both end surfaces that are abutted with each other, and a convex portion 25 that is fitted in the concave portion 24 on the other side. In addition, the shape of the recessed part 24 and the convex part 25 currently formed in each connection body 2 is demonstrated in detail later.

  When forming the stator for a rotating electrical machine, each tooth portion is formed by bending the joint portion 23 so that the teeth portion 22 of the laminated core 1 is positioned outside the arc and turning the entire laminated core 1 backward. The gap between the 22 is increased to reduce interference with the adjacent tooth portion 22. And in this state, the winding which is not shown in figure in each teeth part 22 is wound with high density. After winding, as shown in FIG. 2, the joint portion 23 is bent and formed into a cylindrical shape so that the teeth portion 22 is located inside, and the end faces of the laminated core 1 are brought into contact with each other. As shown in FIG. 4, the end surfaces are integrally coupled by fitting the concave portions 24 and the convex portions 25 formed on both end surfaces of each of the connecting bodies 2 of the laminated core 1 that face each other.

  As described above, the concave portions 24 are provided on one side of both end faces of each of the connecting bodies 2 constituting the laminated core 1, and the convex portions 25 are provided on the other side. The specific shape is as shown in FIG.

  That is, the recess has two types of dovetail shapes as shown in FIGS. 4 (a) and 4 (b). Hereinafter, in order to distinguish the two, the recess having the shape shown in FIG. 4 (a) is provided. The first recess 24a and the recess having the shape shown in FIG. 4B are referred to as a second recess 24b. Moreover, the convex part has two types of ant shapes as shown in FIGS. 4C and 4D, and the convex part of the shape shown in FIG. One convex portion 25a and the convex portion having the shape shown in FIG. 4D are referred to as a second convex portion 25b.

  Here, the relationship between the shapes of the first and second concave portions 24a and 24b and the first and second convex portions 25a and 25b is that the first convex portion 25a is inserted from the circumferential direction with respect to the first concave portion 24a. However, the second protrusion 25b is formed in a shape that allows insertion from both the circumferential direction and the stacking direction. Further, with respect to the second concave portion 24, the first convex portion 25a and the second convex portion 25b are both formed in a shape that allows insertion from both the circumferential direction and the stacking direction.

  Therefore, due to the relationship between the shapes of the first and second concave portions 24a and 24b and the first and second convex portions 25a and 25b, when they are fitted, they are shown in FIGS. Such a combination occurs. That is, the combination of the first concave portion 24a and the first convex portion 25a shown in FIG. 5A allows the first concave portion 24a to be inserted from the stacking direction but is inserted from the circumferential direction. Is an unacceptable fitting form (hereinafter referred to as a first fitting form) X. Further, as shown in FIGS. 5B to 5D, each of the first concave portion 24a and the second convex portion 25b, the second concave portion 24b and the first convex portion 25a, and the second concave portion 24b and the second convex portion 25b. The combination is a fitting form (hereinafter referred to as a second fitting form) Y that allows insertion from both the circumferential direction and the stacking direction.

  And in order to couple | bond together the end surfaces which each connection body 2 faced, the said 1st fitting form X and the 2nd fitting form Y of the laminated iron core 1 at the time of completion of the assembly of the laminated iron core 1 In order to alternately generate a predetermined number of sheets along the stacking direction, the connecting bodies 2 are stacked in advance as follows.

  For example, as shown in FIG. 6A, in order from the top in the stacking direction, the first to second connected bodies 2 have one of them (the left side in the figure) so that the first fitting form X occurs. ) Is formed on the end surface of the first recess 24a (indicated by the oblique line in the figure), and the first protrusion 25a (indicated by the oblique line in the figure) is formed on the other end surface (right side in the figure). About the coupling body 2, the 2nd recessed part 24b is formed in the one end surface, and the 2nd convex part 25b is formed in the other end surface so that the 2nd fitting form Y may arise. In addition, for the tenth to eleventh coupling bodies 2, the first recess 24 a (shown by hatching in the drawing) is provided on one end face and the first end face is provided on the other end face so that the first fitting form X occurs. Protrusions 25b (shown by diagonal lines in the figure) are formed. Further, for the twelfth to eighteenth linked bodies 2, the second concave portion 24b is formed on one end surface and the second convex portion 25b is formed on the other end surface so that the second fitting form occurs. Yes. Hereinafter, the first fitting form X and the second fitting form Y are arranged so as to be alternately generated by a predetermined number along the stacking direction of the connecting body 2.

  In order to integrally connect both end portions of the laminated core 1 constituted by laminating the connecting bodies 2 in this way, the connecting bodies 2 are positioned by two layers in the laminating direction as shown in FIG. As shown in FIG. 6B, the end surfaces of the laminated cores 1 are abutted with each other in a state where the laminated cores 1 are twisted in advance. And fit. In this case, since the laminated iron core 1 is shifted by two layers in the lamination direction, the first fitting form X as shown in FIG. 5A does not occur in each connecting body 2, and FIG. ) To (d) as shown in the second fitting form Y. Therefore, all the convex portions provided on the other end face can be inserted from the circumferential direction with respect to the respective concave portions provided on the one end face of each connecting body 2.

  In this fitted state, the end face is shifted by two layers in the stacking direction. Therefore, as shown in FIG. 6 (c), the stack is made so that the upper and lower surfaces of the end portions that are abutted so as to eliminate this shift are flush with each other. The iron core 1 is press-fitted in the stacking direction. As a result of this press-fitting operation, the first fitting form X as shown in FIG. 5 (a) occurs at the position indicated by the oblique lines in the figure, and the first convex portion 25a is inserted into the first concave portion 24a so that both are fitted. Combined. As a result, the butted end surfaces of the laminated iron core 1 are integrally coupled to each other. In the above description, the number of stacked layers of the connecting bodies 2 when the first fitting form X is generated is two in this example, but is not limited to that number. Further, the positional relationship between the concave portion and the convex portion may be reversed for each connecting body 2.

  As described above, the stator for a rotating electrical machine according to the first embodiment constitutes the first fitting form X only by press-fitting from the laminating direction after the end surfaces of the laminated iron core 1 are shifted and abutted in the laminating direction. Since the butted end faces can be integrally coupled by fitting the first concave portion 24a and the first convex portion 25a, conventional welding and adhesion are unnecessary. For this reason, the influence of thermal deformation etc. of the laminated core 1 can be eliminated, the inner diameter accuracy can be secured, the butt end faces can be fixed easily and reliably, and the reliability is high and the production is inexpensive. It becomes possible to do.

  Further, if the concavo-convex shape as shown in FIG. 4 is used as in the first embodiment, the gap generated between the concavo-convex portions when they are fitted to each other can be minimized. Not only can the generation be reduced, but the number of molds in forming the laminated core 1 can be limited, and therefore, there is an advantage that it can be manufactured at low cost.

Embodiment 2. FIG.
FIG. 7 is a plan view showing a state in the middle of assembling the laminated iron core of the stator for a rotating electrical machine in Embodiment 2 of the present invention, FIG. 8 is a plan view showing a state in which the laminated iron 1 is assembled by joining the end faces, FIG. 9 is a plan view showing a state in which one laminated iron core is wound, and components corresponding to or corresponding to those of the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals.

  The stator for a rotating electrical machine according to the second embodiment is formed by integrally connecting three laminated cores 1a, 1b, and 1c, and each laminated iron core 1a to 1c has basically the same configuration. A magnetic pole piece 20 having a back yoke part 21 and a tooth part 22 protruding from the back yoke part 21 is connected to each other via a joint part 23 so as to be foldable. A plurality (40 in this example) of the coupling bodies 2 are laminated in the thickness direction. Here, in consideration of a three-phase AC rotating electric machine, the number of magnetic pole pieces 20 constituting each coupling body 2 is set to three in correspondence with each phase of UVW. It may be a multiple. Moreover, the number of stacked layers of the above-described connector 2 is merely an example, and the present invention is not limited to such a number.

  Moreover, the recessed part 24 and the convex part 25 are formed for each connection body 2 in each end surface where each laminated | stacked iron core 1a-1c is faced | matched mutually. The specific shapes of the concave portion 24 and the convex portion 25 in this case are the same as those in the first embodiment shown in FIG. 4, and the dovetail-shaped first concave portion 24a and the second concave portion 24b having different shapes are used. And the ant-shaped first convex portion 25a and the second convex portion 25b.

  And when shape | molding the stator for rotary electric machines, as shown in FIG. 9, first, the joint part 23 is bent so that the teeth part 22 of each laminated iron core 1a-1c may be located outside, and a laminated iron core. A winding (not shown) is wound around each tooth portion 22 at a high density in a state in which the whole 1a to 1c is reversely warped so that a gap between the tooth portions 22 is increased. In the case of the second embodiment, since the number of the tooth portions 22 is smaller than that in the first embodiment, the distance between the adjacent tooth portions 22 is widened, and mutual interference during winding is sufficiently reduced. There is an advantage that simple winding can be easily performed.

  After winding, as shown in FIG. 7, the joint part 23 is bent so that the teeth part 22 is located inside, so that the laminated cores 1a to 1c are formed in an arc shape, and then as shown in FIG. In addition, the end surfaces of the three laminated iron cores 1a to 1c are butted against each other, and the recessed portions 24 and the projecting portions 25 formed on the end surfaces of the coupling bodies 2 are fitted to each other so that the butted end surfaces are joined together. To do.

  FIG. 10 shows a state when the end faces of the three laminated iron cores 1a to 1c are butted together and are integrally joined. In the figure, the hatched portions are uneven portions where the first fitting form X occurs. The first concave portion 24a is formed on one end face, and the first convex portion 25a is formed on the other end face. Further, the end portion other than the portion indicated by the oblique lines is formed with the second concave portion 24b on one end face and the second convex portion 25a on the other end face.

  And like the case of Embodiment 1, first, it shows to FIG. 10 (a1), (a2) first so that the end surfaces of each laminated iron core 1a-1c can be inserted from the circumferential direction by a 2nd fitting form. As described above, the end surfaces of the three laminated cores 1a to 1c are abutted with each other in a state in which the positions are shifted by a predetermined number (two in this example) in the stacking direction. Next, as shown in FIGS. 10 (b1) and 10 (b2), the concave portions and the convex portions formed on the both end faces of each connecting body 2 are fitted. In this case, since each laminated iron core 1a-1c is arrange | positioned mutually shifted in the lamination direction, the 1st fitting form X is not produced in each connection body 2, but all become the 2nd fitting form Y. Therefore, it can be fitted from the circumferential direction.

  Next, in order to eliminate the deviation in the stacking direction between the end faces that are butted, as shown in FIGS. 6 (c1), (c2) and (d1), (d2), the top and bottom surfaces of the butted ends are flush with each other. And press-fit in the stacking direction. By this press-fitting work, the first fitting form X is generated at the position indicated by the oblique lines in the figure, and the first convex portion 25 is inserted into the first concave portion 24 so that both are fitted. As a result, the butted end surfaces of the three laminated iron cores 1a to 1c are integrally coupled to each other.

  In the first and second embodiments, the joint portion 23 that connects the magnetic pole pieces 20 is formed by forming a part of the back yoke portion 21 to be thin. The back yoke portions 21 of the pole pieces 20 may be hingedly coupled to each other, and this hinge coupling portion may be configured as a joint portion 23.

It is a perspective view which shows the state in the middle of the assembly of the laminated core of the stator for rotary electric machines in Embodiment 1 of this invention. It is a top view of the state which bent the laminated iron core of FIG. 1 and formed in the cylindrical shape. It is a top view which shows the state which couple | bonded end surfaces and assembled the laminated iron core. It is a top view which shows the uneven | corrugated shape formed in the butt | matching end surface of each connection body of a laminated iron core. It is explanatory drawing of the fitting form of the recessed part and convex part which were formed in the butt | matching end surface of each connection body of a laminated iron core. It is explanatory drawing which shows typically a state when each end surface of a laminated iron core is faced | matched mutually and each connection body is couple | bonded together. It is a top view which shows the state in the middle of the assembly of the laminated iron core of the stator for rotary electric machines in Embodiment 2 of this invention. It is a top view which shows the state which couple | bonded end surfaces and assembled the laminated iron core. It is a top view which shows the state at the time of winding of one laminated iron core. It is explanatory drawing which shows typically a state when end surfaces of three laminated iron cores are faced | matched mutually and each connection body is couple | bonded integrally.

Explanation of symbols

1, 1a-1c laminated iron core, 2 connected body, 20 pole piece, 21 back yoke part,
22 teeth part, 23 joint part, 24 concave part, 24a first concave part,
24b 2nd convex part, 25 convex part, 25a 1st convex part, 25b 2nd convex part,
X 1st fitting form, Y 2nd fitting form.

Claims (4)

A plurality of magnetic pole pieces each having a back yoke portion and a teeth portion protruding from the back yoke portion are connected via a joint portion so as to be bendable, and a plurality of the connected bodies are laminated in the thickness direction. A laminated iron core is configured, and the joint portion of the laminated iron core is bent and formed into a cylindrical shape, and is a stator for a rotating electrical machine in which end faces that face each other are fixed to each other,
On the end surfaces of the laminated cores butted against each other, a concave portion and a convex portion fitted to the concave portion are provided for each coupling body, and the concave portion and the convex portion allow fitting from the lamination direction. A first fitting form that is a combination of shapes that do not allow fitting from the circumferential direction and a second fitting form that is a combination of shapes that allow fitting from both the circumferential direction and the stacking direction are generated. And each of the coupling bodies is stacked and disposed so that the first fitting form and the second fitting form are alternately generated by a predetermined number along the stacking direction. A stator for a rotating electrical machine, wherein the end faces of the laminated core are integrally coupled by fitting a concave portion and a convex portion, which are in a fitting form. The concave portion and the convex portion have two types of concave portions having different shapes and two types of convex portions having different shapes, and one of the four combinations of the shape of the concave portions and the convex portions, The combination of only one convex part comprises the said 1st fitting form, and the combination of another recessed part and a convex part comprises the said 2nd fitting form, The Claim 1 characterized by the above-mentioned. Stator for rotating electrical machines. The laminated iron core is provided in a state of being divided into a plurality of parts along a circumferential direction, and end surfaces of the laminated iron cores that are abutted with each other are integrally coupled to each other. A stator for a rotating electric machine according to 1. The stator for a rotating electrical machine according to claim 3, wherein the number of magnetic pole pieces constituting the coupling body is a multiple of three.

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