JP6937811B2 - Rotating machine and manufacturing method of rotating machine - Google Patents

Description

The present application relates to a rotary electric machine and a method for manufacturing a rotary electric machine.

In a conventional rotary electric machine, a split core formed by fixing electromagnetic steel sheets to each other in a tooth portion is welded and fixed in a yoke portion formed in an arc shape on the outer diameter side of the tooth portion and connected in an annular shape to form a stator core. Those constructed are known (see, for example, Patent Document 1).

In this conventional method, the adhesive applied to the tooth portion permeates the welded portion of the yoke portion, and during welding, a part of the adhesive is gasified due to heat input during welding, and the welding accuracy and strength are deteriorated. Although there are problems, there are some that disclose techniques for solving these problems (see, for example, Patent Document 2). In this document, electrical steel sheets having a water-repellent or oil-repellent coating are laminated in the vicinity of welding points connecting adjacent split cores of the stator, and the electrical steel sheets are connected by an adhesive.

Japanese Unexamined Patent Publication No. 5-068352 Japanese Unexamined Patent Publication No. 2002-262485

According to the rotary electric machine disclosed in Patent Document 2, since it has a water-repellent and oil-repellent coating in the vicinity of the welding point where the adjacent split cores are welded and fixed, welding of an adhesive for fixing the electromagnetic steel sheets to each other is performed. It prevents the penetration into the point and prevents the generation of gas. Since each electrical steel sheet is coated with water and oil repellency, there is a problem that the price of the rotary electric machine rises. Further, since the water-repellent and oil-repellent coatings are provided on the insulating film of the electrical steel sheet, the axial dimension of each electrical steel sheet is increased, the space factor of the stator core is reduced, and the performance is improved in the motor having the same core axial length. There is a problem of decreasing.

The present application discloses a technique for solving the above-mentioned problems, and is an adhesive applied to fix an electromagnetic steel sheet adjacent to a split core with an electromagnetic steel sheet having no water-repellent or oil-repellent coating. However, by suppressing the range that spreads to the outer diameter side during assembly and preventing penetration into the welding point, the space factor of the core is not reduced, defects in the welded part are suppressed, and the welded portion is easily adjacent in the circumferential direction. It is an object of the present invention to provide a rotary electric machine capable of welding and fixing between divided cores.

The rotary electric machine disclosed in the present application is
Rotor,
A stator core in which a plurality of cores formed as a columnar body by laminating a plurality of electromagnetic steel sheets having an arc-shaped yoke portion and a tooth portion formed so as to project radially inward of the yoke portion are arranged in an annular shape. A stator, which has a coil wound around the stator core, and is arranged with a gap from the rotor.
It is a rotary electric machine equipped with
The electromagnetic steel plate of the core is formed in combination with a portion closer to the outer diameter of the circumferential end portion forming the outer shell of the yoke portion, and is a portion of the portion that contacts the adjacent split core on the outer peripheral side of the yoke portion. It has a side bending portion composed of a straight line or a curved line , and at the circumferential end portion forming the outer shell of the yoke portion, it is positioned in the radial direction in combination with another electromagnetic steel plate of the core adjacent in the circumferential direction. Has a positioning recess or positioning protrusion for
One of said magnetic steel sheets, in the inner diameter side of the region of the yoke portion of the electromagnetic steel sheet comprising the tooth portion by an adhesive, which is adhered and fixed to the other of the electromagnetic steel plates adjacent in the thickness direction, the The adhesive region on each electrical steel sheet of the adhesive is characterized in that it is provided apart from the side bent portion.

According to the rotary electric machine disclosed in the present application, the adhesive coating region of the split core is combined with the adjacent split core to perform radial positioning from the outermost diameter portion of the positioning concave portion or the positioning convex portion. By arranging the adhesive on the inner diameter side and on the inner diameter side of the side bending portion , the adhesive is applied to the outer peripheral side of the yoke portion by the curved or corner-shaped portion of the dividing core constituting the positioning concave portion or the positioning convex portion. By suppressing the penetration into, it is possible to suppress the deterioration of the shape accuracy of the split core and improve the productivity of the rotary electric machine.

It is sectional drawing which shows an example of the rotary electric machine of Embodiment 1. FIG. It is a perspective view which shows the appearance of the rotary electric machine of Embodiment 1. FIG. It is a perspective view which shows the stator of the rotary electric machine of FIG. It is a figure which shows an example of the split core of the rotary electric machine of Embodiment 1. FIG. It is a figure which shows the stator core which is the aggregate of the divided core of FIG. It is a top view of the electromagnetic steel plate which is a component of the division core of FIG. It is a figure which shows an example of the existence region of an adhesive in the state which assembled the electromagnetic steel sheet of FIG. 6 as a split core. It is a figure which shows an example of the coating area of the adhesive before assembling the electromagnetic steel sheet of FIG. 6 as a split core. It is a top view for demonstrating the stator core of the rotary electric machine of Embodiment 2. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 3. It is a top view for demonstrating the stator of the rotary electric machine of Embodiment 4. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 5. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 6. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 7. It is a figure for demonstrating the weld part of the split core of the rotary electric machine of Embodiment 7. It is a figure which shows an example of the coating area of the adhesive before assembling the electromagnetic steel sheet of FIG. 15 as a split core. It is a top view for demonstrating the electromagnetic steel sheet of the rotary electric machine of Embodiment 8. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 9. It is a top view for demonstrating the split core of the rotary electric machine of Embodiment 10. It is a flowchart for demonstrating an example of the manufacturing method of the split core of the rotary electric machine of Embodiment 11. It is a flowchart for demonstrating an example of the manufacturing method of the split core of the rotary electric machine of Embodiment 12.

Embodiment 1.
Hereinafter, the rotary electric machine according to the first embodiment will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an example of the rotary electric machine 100 of the first embodiment. Further, FIG. 2 is a perspective view showing the appearance of the rotary electric machine according to the first embodiment, and FIG. 3 is a perspective view showing the stator in FIG. 2. The rotary electric machine 100 includes a rotor 1 rotatably provided (the rotor 1 is fixed to a shaft 3 as shown in FIG. 1) and a stator 2 arranged to face the rotor 1 (rotor 1 is fixed to a shaft 3 as shown in FIG. 1). (See FIGS. 1 and 2). Here, the stator 2 includes a stator core 4 and a coil 5 as its components (see FIG. 3).
Further, as shown in FIG. 4, the stator 2 is formed by laminating an electromagnetic steel plate 9 having an arcuate yoke portion 6 and a teeth portion 7 protruding inward in the radial direction from the yoke portion 6 in the thickness direction. The divided cores 10 formed as columnar bodies are arranged in an annular shape in contact with another divided core 10 adjacent to each other at both ends 8 in the circumferential direction of the yoke portion (including the positioning concave portion 8a and the positioning convex portion 8b). The coil 5 is wound around the stator core 4 (see FIG. 5) in which the coil 5 is formed (see FIG. 2). In the following, the divided core may be simply referred to as a core.

The split core 10 combined in an annular shape is welded and fixed to the adjacent split core, and has a cylindrical frame structure on the outer diameter side of the ring portion formed by the outer circumference of the yoke portion 6. The stator core 4 is formed by arranging, fitting and fixing.
Further, in the above-mentioned divided cores, the concave positioning concave portion 8a and the convex positioning convex portion 8b in which adjacent divided cores are combined with each other on the circumferential side surface of the yoke portion to suppress the positional deviation in the radial direction. (See FIGS. 4 and 6).
Further, the electromagnetic steel sheets 9 are laminated by adhering the electromagnetic steel sheets adjacent to each other in the thickness direction with an adhesive at least on the teeth portion (see FIGS. 7 and 8). As this adhesive, an anaerobic adhesive, a thermoplastic adhesive, a thermosetting adhesive and the like can be used.

The region where the electromagnetic steel plate is bonded by the adhesive is a recess for suppressing misalignment at both ends of the yoke portion 6 in the circumferential direction (the left and right ends in the circumferential direction forming the outer shell in the circumferential direction of the yoke portion 6). Two side bending portions 11 (FIG. 6) composed of a concave positioning concave portion 8a having a shape or a convex positioning portion 8b having a convex shape, and a straight line or a curved line of a portion in contact with an adjacent split core on the outer peripheral side of the yoke portion. Is arranged centering on the inner diameter side of the portion surrounded by the dotted line). That is, in FIG. 7, a region (teeth) on the inner diameter side of the outer diameter position indicated by the alternate long and short dash line of the yoke portion 6, which is the region indicated by hatching (hereinafter, the region indicated by hatching is referred to as an adhesive region S). In the region on the outer diameter side of the outer diameter position indicated by the two-dot chain line of the yoke portion 6), from the above two side bending portions 11 (see the portion surrounded by the dotted line in FIG. 7). Placed in isolated areas. More specifically, the yoke portion 6 is arranged in a portion closer to the shape center axis AA (see the alternate long and short dash line in the figure; the same applies hereinafter) of the electromagnetic steel sheet on the inner side in the circumferential direction from both ends in the circumferential direction.

As a result, for example, when the adhesive permeates the outside of the area applied between the electromagnetic steel plates during pressurization or winding to improve the accuracy of the axial dimension of the split core, at both ends in the circumferential direction of the yoke portion. It is possible to prevent the adhesive, which has conventionally flowed to the bent portion of the side, from being stored in the vicinity of the coated region and permeating to the outer peripheral side of the yoke portion.

Further, even when a two-component adhesive consisting of a curing accelerator and a main agent is used as the adhesive, regions to be adhered by the main agent having a larger coating amount than the curing accelerator are formed at both ends in the circumferential direction of the yoke portion. Can obtain the same effect by arranging the above-mentioned side bending portion inside.

When the adhesive is applied, when the laminated electromagnetic steel plates are bonded, the adhesive region is closer to the shape center axis of the electromagnetic steel plate than the side bent portion at both ends of the yoke portion in the circumferential direction. The adhesive application range is set to a limited area (hereinafter referred to as an adhesive application area T) as compared with FIG. 7, as shown by a figure surrounded by a dotted circle in FIG. 8, for example. be able to.

As described above, by limiting the coating range of the adhesive to the adhesive region, the shape accuracy of the outer periphery of the yoke portion of the split core is improved when the adhesive is cured. Further, as a result, when the split core comes into contact with the adjacent split core at both curved or straight portions on the outer peripheral side of the yoke portion in the circumferential direction, the shape accuracy of the contact portion is improved, so that the shape variation of the stator core can be suppressed. The productivity of the rotary electric machine can be improved. Further, this improves the shape accuracy of the outermost diameter of the stator core when the split cores are arranged in an annular shape. It has the effect of facilitating the management of generated stress.

In the above, the example in which each electrical steel sheet has a pair of positioning recesses and positioning protrusions for positioning the core in the radial direction has been described, but the present invention is not limited to this, and only the positioning recesses are provided. An electromagnetic steel sheet having an electromagnetic steel sheet and an electromagnetic steel sheet having only a convex portion for positioning may be used, and these may be alternately adjacent to each other to position the core in the radial direction.
Further, the coil wound around the stator core according to the first embodiment may be wound in a distributed winding manner. As a result, the electromagnetic steel sheet can be punched at a high density at the time of punching, so that the waste area of the electrical steel sheet can be reduced and the material yield can be improved.

Embodiment 2.
Next, the rotary electric machine according to the second embodiment will be described with reference to the drawings. Here, the effect of the rotary electric machine when the adjacent split cores are fixed by welding will be described with reference to FIG. The divided cores are fixed by welding at the adjacent points on the outermost periphery of the yoke portion. The welded portion 12 which is the welded portion is formed in a dot shape at either a position extending in the axial direction or a position in the axial direction.

In the rotary electric machine of the second embodiment, when the adjacent split cores are fixed by welding at the outermost peripheral position of the yoke portion, when the split core of the first embodiment is used, an adhesive is applied to the welding point. Since it does not exist, it is possible to suppress the generation of gas due to the adhesive during welding. Therefore, there is an effect that the welding accuracy can be easily controlled.
Further, in order to prevent the adhesive from penetrating into the welding point, it is not necessary to install an oil-repellent or water-repellent coating on the electromagnetic steel plate, so that the rotary electric machine can be produced at low cost. Further, there is no decrease in the space factor when the electromagnetic steel sheet is laminated due to the oil-repellent or water-repellent coating, and the performance can be improved when manufacturing a rotary electric machine of the same size.

Embodiment 3.
Next, the rotary electric machine according to the third embodiment will be described with reference to the drawings. FIG. 10 is a plan view showing an example of the split core of the rotary electric machine according to the third embodiment. At the center of the yoke portion 6 in the circumferential direction (including the shape center axis AA of the electromagnetic steel sheet 9 and close to the shape center axis; the same applies hereinafter), the peripheral portion in the circumferential direction including both ends 8 in the circumferential direction of the yoke portion (far from the shape center axis). The adhesive region S of the adhesive protrudes toward the outer diameter side from the side (the same applies hereinafter).

In the rotary electric machine of the third embodiment, since the adhesive strength at the time of laminating the laminated steel plate at the yoke portion can be improved, the deformation at the time of assembling can be suppressed and the productivity can be improved.

Embodiment 4.
Next, the rotary electric machine according to the fourth embodiment will be described with reference to the drawings. In the rotary electric machine according to the fourth embodiment, notches are formed in the outermost peripheral portions of both ends in the circumferential direction of the yoke portion of the split core, and the notches are combined. A groove 14 extending in the axial direction is formed, and a portion to be fixed by welding is provided inside the groove 14 (see FIG. 11). When it is not necessary to form the welded portion in the entire axial direction, the grooves 14 may be formed at intervals only in the locations where the welds are welded in the axial direction.

In the rotary electric machine of the fourth embodiment, since the groove shape does not affect the contour shape of the outer circumference of the stator core by the welded portion, it is easy to manage the force at the time of press fitting at the time of fixing the frame or the generated stress. effective. Further, since the frame member 13 provided on the outside of the stator core is used to fix the frame member 13 to the housing of the rotary electric machine, it is not necessary to provide a fixing structure (for example, a screw hole) to the housing on the electromagnetic steel sheet, and the electromagnetic steel plate is deteriorated by processing. This will reduce the number of parts and improve the performance of the rotating electric machine as a whole.

Embodiment 5.
Next, the rotary electric machine according to the fifth embodiment will be described with reference to the drawings. In the rotary electric machine according to the fifth embodiment, as shown in FIGS. 12a and 12b, a cross section of a groove 14 formed at the boundary between two adjacent split cores when cut in a direction perpendicular to the axial direction. The feature is that the shape is formed into a tapered shape that expands (increases in size) as it shifts from the inner diameter side to the outer diameter side.

In the rotary electric machine of the fifth embodiment, since the shape of the groove 14 formed at the boundary between the two adjacent split cores is a tapered shape as described above, the organic film of the electromagnetic steel sheet is formed when the electromagnetic steel sheet is welded. Area where the gas generated when the residual components of the press oil used when punching the electrical steel sheet or the residual components such as the curing accelerator used in the two-component acrylic adhesive melt and vaporize escape to the atmosphere. This makes it possible to improve the welding performance and sufficiently secure the required welding strength. Further, the groove 14 can suppress a dimensional change in the outer diameter of the split core due to the welding bead generated at the time of welding.

Embodiment 6.
Next, the rotary electric machine according to the sixth embodiment will be described with reference to the drawings. In the rotary electric machine according to the sixth embodiment, as shown in FIG. 13, the cross-sectional shape of the groove 14 when cut in the direction perpendicular to the axial direction is changed from the inner diameter side to the outer diameter side. It is characterized in that it is formed to have the same width regardless of the position. The portion formed having the same width regardless of the outer diameter position is hereinafter referred to as an opening.

In the rotary electric machine according to the sixth embodiment, since the positioning at the time of assembly is possible by using the opening at the time of assembling the split core, the productivity is improved. Further, when fixing the adjacent split cores to each other, the opening can suppress the swelling of the weld bead during welding and increase the contact area with the frame, so that the heat generated in the coil portion or the split core can be increased. It is advantageous when the heat generated in the portion is cooled on the outer periphery of the stator core or through the frame. Further, when the rotary electric machine is fixed by the frame, the holding force of the stator core is increased by increasing the contact area with the frame, and the rigidity of the rotary electric machine is improved.

Embodiment 7.
Next, the rotary electric machine according to the seventh embodiment will be described with reference to the drawings. In the rotary electric machine according to the seventh embodiment, as shown in FIGS. 14a and 14b, the split cores are laminated on the outer peripheral side of the yoke portion by connecting electromagnetic steel sheets adjacent to each other in the thickness direction by welding. There is. It has a groove shape on the outer peripheral side of the yoke portion, and welding is performed inside the groove. Here, FIG. 14a shows a case where the welded portions 12 are provided over the entire axial direction of the split core, and FIG. 14b shows the welded portions 12 provided at intervals rather than the entire axial direction of the split core. Indicates the case.

In these cases, as shown in the plan view of the electrical steel sheet of FIG. 15, the adhesive region S on the inner diameter side is larger than the peripheral portion in the circumferential direction in the central portion in the circumferential direction including the shape central axis AA of the electrical steel sheet. The region becomes narrower, and as it approaches the shape center axis AA, it becomes a region of the electromagnetic steel sheet that fits closer to the inner diameter side.

In the central portion in the circumferential direction, the effect of suppressing the expansion of the adhesive region S in the outer diameter direction by the side bending portions provided at both ends in the circumferential direction of the yoke portion is weaker than that in the peripheral portion in the circumferential direction. .. Therefore, as shown in FIG. 15, in order to make the adhesive region in the central portion in the circumferential direction fit on the inner diameter side of both ends in the circumferential direction, the adhesive application region T is set to the case of the above-described first embodiment. It is necessary to make appropriate adjustments so that the region is different from that of (see FIG. 8).
Specifically, as shown in FIG. 16, the adhesive coating region formed in the central portion in the circumferential direction is limited to only the inner diameter side of the electromagnetic steel plate 9 as compared with the adhesive coating region formed in the peripheral portion in the circumferential direction. By forming the adhesive region, it is possible to suppress the expansion of the adhesive region in the outer radial direction in the central portion in the circumferential direction.

In the rotary electric machine according to the seventh embodiment, winding can be easily performed by increasing the number of teeth or the number of split cores for each electrical steel sheet in order to improve the performance and productivity of the rotary electric machine. It becomes possible to respond. In this way, even when the area of the teeth portion or the area of the yoke portion of the split core is reduced, the fixing strength of the laminated magnetic steel sheets can be secured, and the core can be used as a core in an annular state or a single split core state. It is possible to secure the rigidity of. Further, since the welded portion is provided on the outer diameter side of the yoke portion, which is a region where the magnetic flux is not concentrated, it also has an iron loss suppressing effect. Further, by welding in the groove portion, the shape accuracy of the outer shape of the stator core can be ensured, so that the productivity is improved. Further, the adhesive region S on the inner diameter side of the electromagnetic steel plate is located on the inner diameter side of the peripheral portion in the circumferential direction in the central portion in the circumferential direction, thereby suppressing the penetration of the adhesive into the welded portion and improving the workability of welding. Can be improved.

Embodiment 8.
Next, the rotary electric machine according to the eighth embodiment will be described with reference to the drawings. In the rotary electric machine according to the eighth embodiment, as shown in FIGS. 17a and 17b, a positioning recess 8a or a positioning protrusion 8b for suppressing misalignment when manufacturing a stator core from a split core, and a yoke portion 6 The side bending portion 11 formed by a straight line or a curved line of a portion in contact with the adjacent split core on the outer peripheral side of the above is formed in a substantially acute angle shape.

In the rotary electric machine according to the eighth embodiment, the adhesive is stored in the side bending portion 11 having a substantially acute angle, and the effect of suppressing the penetration of the adhesive to the outer diameter side of the electromagnetic steel plate is increased.

Embodiment 9.
Next, the rotary electric machine according to the ninth embodiment will be described with reference to FIG. Since the rotary electric machine according to the ninth embodiment is almost the same as the content shown in the fifth embodiment, only the content different from the fifth embodiment will be described here. The present embodiment is characterized in that the fixing by welding of the divided cores is performed by keyhole type laser welding instead of normal welding.

In the rotary electric machine according to the ninth embodiment, the split cores are fixed to each other by keyhole type welding, and the welded portion is formed in a state where the energy density at the time of laser irradiation is high (high power density laser beam). 15), a sufficient welding penetration depth of the outer diameter of the yoke can be secured. Therefore, the rigidity of the stator core of the rotary electric machine can be further increased. In addition, welding can be performed in a short time, which has the effect of suppressing welding distortion of the welded portion.

Embodiment 10.
Next, the rotary electric machine according to the tenth embodiment will be described with reference to FIG. Since the rotary electric machine according to the tenth embodiment is almost the same as the content shown in the sixth embodiment, only the content different from the sixth embodiment will be described here. The present embodiment is characterized in that the fixing of the divided cores by welding is performed by heat conduction type welding with a laser beam 16 (normal, which is not a high-density type).

In the rotary electric machine according to the tenth embodiment, the split cores are fixed to each other by using a normal laser beam 16 and performing heat conduction type welding with less evaporation of the material, so that the melting depth of the welded portion is shallow. can do. For this reason, the gas vaporized by melting the organic film or the residue of the press oil in the welded portion is easily evaporated to the atmosphere, which has the effect of reducing blowholes or spatter generation in the welded portion due to the vaporized gas. .. In addition, welding accuracy is easy to control and productivity is improved. Further, since the welding width can be secured in the circumferential direction, the welding area can be secured at the butt portion between the adjacent split cores, which is effective against the deviation of the butt portion.

Embodiment 11.
Next, the manufacturing method of the rotary electric machine according to the eleventh embodiment will be described with reference to the drawings. FIG. 20 shows a flowchart of a method for manufacturing a rotary electric machine according to the eleventh embodiment.

As shown in FIG. 20, in the manufacturing method of the eleventh embodiment, the step of transporting the electrical steel sheet before processing (step S1) and the adhesive are applied to a predetermined region (see FIGS. 8 and 16) of the electrical steel sheet. In the step of applying or spraying (step S2), the yoke portion on the arc, the teeth portion protruding radially inward from this yoke portion, and the positioning concave portion and the positioning convex portion for radially positioning the divided cores are formed. The step of forming the grained electrical steel sheet (the formation of the electrical steel sheet in this step includes a punching process by a press, a wire cutting process, and a laser process. Step S3) and the adhesive are cured to laminate the electrical steel sheet. The step of producing the divided cores (step S4), the step of arranging the produced divided cores in an annular shape (step S5), and the contact between the adjacent divided cores on the outermost diameter side of the yoke portion. In the position, the step of welding and fixing in the axial direction (step S6) is included.

Embodiment 12.
Next, the manufacturing method of the rotary electric machine according to the twelfth embodiment will be described with reference to the drawings. FIG. 21 shows a flowchart of a method for manufacturing a rotary electric machine according to the twelfth embodiment. The method for manufacturing a rotary electric machine according to the twelfth embodiment is different from the method for manufacturing a rotary electric machine according to the eleventh embodiment in that a two-component adhesive containing a main agent and a curing accelerator is used as an adhesive. Specifically, the step of applying or spraying the adhesive of the eleventh embodiment (step S2) is divided into two steps (step S12 and step S13) described below.

That is, in the method for manufacturing a rotary electric machine according to the twelfth embodiment, the step of spraying or applying the curing accelerator to the entire surface of the electromagnetic steel sheet (step S12), and subsequently, the main agent is applied to the entire surface of the electromagnetic steel sheet. It is characterized by further including the step (step S13) to be performed. Since the contents of the other steps (step S11, steps S14 to S17) are the same as those of the eleventh embodiment, the description thereof will be omitted here.

In the morphology 12 of the present embodiment, for example, a two-component curable acrylic adhesive can be applied. An example of this manufacturing method will be additionally described below. First, a hardening accelerator is applied or sprayed on an electromagnetic steel sheet which is a hoop material, and the main agent is applied before or at the same time as punching the product shape in a press die. At this time, curing is started by mixing the curing accelerator and the main agent applied to the steel sheet. Electromagnetic steel sheets punched out in the press die are laminated in a state where the curing accelerator and the main agent are applied, and a predetermined number of sheets are laminated, adhered and fixed in the press die, and discharged from the press die. Form a split core.

In the method for manufacturing a rotary electric machine according to the twelfth embodiment, particularly when a two-component acrylic adhesive is used, the curing accelerator is sprayed or applied to the entire surface of the core, but the amount or application of the main agent is applied. By controlling the position, it is possible to control the adhesion region after the reaction between the main agent and the curing accelerator, and when welding the contact position of the adjacent split cores on the outermost diameter side of the yoke portion in the axial direction. , It is possible to set the bonding area that does not affect the welding. Therefore, it is possible to suppress defects in the welded portion and stabilize the quality.

Further, when the split cores are laminated and fixed in the press die, the split cores can be cured at room temperature by using a two-component acrylic adhesive, and the curing speed is high, and the split cores are discharged from the press. It is possible to form a laminated core by. Therefore, since the heating process is not required to cure the adhesive, the productivity is improved by reducing the man-hours or the equipment cost.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments. For example, in the above, each electrical steel sheet has a pair of positioning concave portions and positioning convex portions for positioning the core in the radial direction, but the present invention is not limited to this, and for example, the stator core shown in FIG. When viewed from the top surface, each of the electrical steel sheets having a pair of positioning recesses and a pair of positioning protrusions is included, and the other electrical steel sheets are composed of a pair of positioning recesses and positioning protrusions. May be.

1 rotor, 2 stator, 3 shaft, 4 stator core, 5 coil, 6 yoke part, 7 teeth part, 8 both ends in the circumferential direction of the yoke part, 8a positioning recess, 8b positioning convex, 9 electromagnetic steel plate, 10 split core, 11 Side bending part, 12 welded part, 13 frame member, 14 groove, 15 high power density laser light, 16 laser light, 100 rotary electric machine, S adhesive area, T adhesive application area

Claims (17)

Rotor,
A stator core in which a plurality of cores formed as a columnar body by laminating a plurality of electromagnetic steel sheets having an arc-shaped yoke portion and a tooth portion formed so as to project radially inward of the yoke portion are arranged in an annular shape. A stator, which has a coil wound around the stator core, and is arranged with a gap from the rotor.
It is a rotary electric machine equipped with
The electromagnetic steel plate of the core is formed in combination with a portion closer to the outer diameter of the circumferential end portion forming the outer shell of the yoke portion, and is a portion of the portion that contacts the adjacent split core on the outer peripheral side of the yoke portion. It has a side bending portion composed of a straight line or a curved line , and at the circumferential end portion forming the outer shell of the yoke portion, it is positioned in the radial direction in combination with another electromagnetic steel plate of the core adjacent in the circumferential direction. Has a positioning recess or positioning protrusion for
One of said magnetic steel sheets, in the inner diameter side of the region of the yoke portion of the electromagnetic steel sheet comprising the tooth portion by an adhesive, which is adhered and fixed to the other of the electromagnetic steel plates adjacent in the thickness direction, the A rotary electric machine characterized in that an adhesive region on each electrical steel sheet of an adhesive is provided at a distance from the side bent portion. The rotary electric machine according to claim 1, wherein the core is formed by welding and fixing to each other adjacent cores at outer peripheral positions of both ends in the circumferential direction of the yoke portion. .. The adhesive region is
Both ends of the yoke portion in the circumferential direction are outside the outermost diameter portion of the positioning concave portion or the positioning convex portion, and are on the inner diameter side in the radial direction of the yoke portion.
According to claim 1 or 2, the central portion of the yoke portion protrudes toward the outer diameter side of the yoke portion in the radial direction from the outermost diameter portion of the positioning concave portion or the positioning convex portion. The rotating electric machine described. The rotary electric machine according to any one of claims 1 to 3, wherein the stator core is fixed by a cylindrical frame member by a tight fit. In the core, each of the electromagnetic steel sheets has notches at the outermost peripheral portions at both ends in the circumferential direction of the yoke portion.
A claim characterized in that a groove is formed in the axial direction of the core by two adjacent core notches, and the two adjacent cores are welded and fixed to each other inside the groove. The rotary electric machine according to any one of 2 to 4. The rotary electric machine according to claim 5, wherein the cross-sectional shape of the groove formed by two adjacent cores is a tapered shape extending toward the outer diameter side. The rotary electric machine according to claim 5, wherein the cross-sectional shape of the groove formed by two adjacent cores is open with an equal width in the radial direction. The rotary electric machine according to any one of claims 1 to 7, wherein each of the core electromagnetic steel sheets is welded and fixed to an adjacent electrical steel sheet at the outermost peripheral portion of the yoke portion. The adhesive region is located on the inner diameter side of the outermost diameter portion of the positioning concave portion or the positioning convex portion in the peripheral portion in the circumferential direction of the yoke portion.
The rotary electric machine according to claim 8, wherein the central portion in the circumferential direction of the yoke portion is on the inner diameter side in the radial direction of the electromagnetic steel sheet with respect to the peripheral portion in the circumferential direction of the yoke portion. The welded fixing part that welds and fixes adjacent electromagnetic steel sheets at the yoke part is
The rotary electric machine according to claim 8 or 9, wherein the outermost peripheral portion of the yoke portion of the core is inside a groove formed in the axial direction of the core. Russia over data,
A stator core in which a plurality of cores formed as a columnar body by laminating a plurality of electromagnetic steel sheets having an arc-shaped yoke portion and a tooth portion formed so as to project radially inward of the yoke portion are arranged in an annular shape. A stator, which has a coil wound around the stator core, and is arranged with a gap from the rotor.
It is a rotary electric machine equipped with
The electromagnetic steel plate of the core is formed in combination with a portion closer to the outer diameter of the circumferential end portion forming the outer shell of the yoke portion, and is a portion of the portion that contacts the adjacent split core on the outer peripheral side of the yoke portion. It has a side bending portion composed of a straight line or a curved line , and at the circumferential end portion forming the outer shell of the yoke portion, it is positioned in the radial direction in combination with another electromagnetic steel plate of the core adjacent in the circumferential direction. Has a positioning recess or positioning protrusion for
One of the electrical steel sheets is adhered and fixed to the other electrical steel sheets adjacent in the thickness direction by an adhesive in a region near the inner diameter of the yoke portion of the electrical steel sheet including the teeth portion, and is bonded. In the adhesive region on each electrical steel sheet of the agent, the position of the welded portion for welding and fixing the electrical steel sheet is the position where the split cores are fixed, the adjacent point on the outermost periphery of the yoke portion, and the split. A rotary electric machine characterized in that it is provided depending on which position of the inside of the groove provided on the outer peripheral side of the yoke portion of the laminated split core, which is the position where the core is fixed. .. A claim that the positioning concave portion or the positioning convex portion of the core has an acute-angled shape with a side surface of the yoke portion in which a curved portion or a straight portion forming the shape thereof is in contact with an adjacent core. The rotary electric machine according to any one of 1 to 11. The rotary electric machine according to any one of claims 1 to 12, wherein the coil wound around the stator core is wound in a distributed winding. Rotor,
It has an arcuate yoke portion and a teeth portion formed so as to project inward in the radial direction of the yoke portion, and is formed in combination with a portion closer to the outer diameter of the circumferential end portion forming the outer shell of the yoke portion. A plurality of cores formed as a columnar body by laminating a plurality of electromagnetic steel plates having side bending portions formed by straight lines or curves of portions contacting adjacent split cores on the outer peripheral side of the yoke portion are annular. A method for manufacturing a rotary electric machine, which includes a stator core arranged in a steel shaft, a coil wound around the stator core, and a stator arranged with a gap between the rotor and the rotor.
In the peripheral portion of the electromagnetic steel plate including the circumferential end portion forming the outer shell of the yoke portion, for positioning in the radial direction in combination with the electromagnetic steel plate of the other core adjacent in the circumferential direction. A step of applying or spraying an adhesive to a region formed on the inner diameter side in the radial direction of the yoke portion from the outermost peripheral portion of the positioning concave portion and the positioning convex portion and separated from the side bending portion.
A step of forming an electromagnetic steel sheet having the positioning concave portion and the positioning convex portion at the circumferential end portion, and
The process of curing the adhesive and laminating the electrical steel sheets,
A step of arranging a core formed by laminating the electromagnetic steel sheets in an annular shape, and
A step of welding and fixing the cores in the axial direction at the outer peripheral contact portion of the yoke portion between adjacent cores.
A method for manufacturing a rotary electric machine, which comprises. The method for manufacturing a rotary electric machine according to claim 14, wherein the cores are welded and fixed by keyhole type laser welding. The method for manufacturing a rotary electric machine according to claim 14, wherein the cores are welded and fixed by heat conduction type laser welding. The adhesive is a two-component adhesive containing a main agent and a curing accelerator.
The claim is characterized in that, in the step of applying or spraying the adhesive, the curing accelerator is sprayed or applied to the entire area of the electromagnetic steel sheet, and then the main agent is applied to the entire area of the electromagnetic steel sheet. The method for manufacturing a rotary electric machine according to any one of 14 to 16.

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