JP7357811B2 - Split core, rotating electrical machine, split core manufacturing method, and rotating electrical machine manufacturing method - Google Patents

Description

The present application relates to a split core, a rotating electrical machine, a method for manufacturing a split core, and a method for manufacturing a rotating electrical machine.

In order to reduce the amount of electromagnetic steel sheets used, the stator core of the stator of conventional rotating electric machines is manufactured by dividing the stator core into a split core, and when manufacturing the split core, multiple split cores are arranged in a staggered manner and pressed. It is something.

Patent No. 5387698

In conventional split cores, rotating electrical machines, split core manufacturing methods, and rotating electrical machine manufacturing methods, in order to punch out multiple split cores with a press, it is necessary to leave space between the multiple split cores, which increases costs. There is a problem.

The present application discloses a technology for solving the above-mentioned problems, and aims to provide a low-cost split core, a rotating electrical machine, a method for manufacturing a split core, and a method for producing a rotating electrical machine. shall be.

The split core disclosed in this application is
In a divided core in which a stator core that constitutes a stator of a rotating electric machine is divided into multiple pieces in the circumferential direction,
Each of the divided cores is
a back yoke portion extending in the circumferential direction;
and teeth portions protruding inward in the radial direction from one end side in the circumferential direction of the back yoke portion,
Any two of the divided cores,
The base of the tooth portion on the radially inner inner circumferential surface of the back yoke portion of one of the split cores, and the circumferentially outer circumferential surface of the back yoke portion of the other split core on the radially outer side. When placed with the corner of one end in contact,
The entire inner circumferential surface of the back yoke portion of one of the split cores is formed in a shape that follows the outer circumferential surface of the back yoke portion of the other split core, and
The entire other end surface on the other end side in the circumferential direction of the teeth portion of one of the split cores is formed in a shape along the one end surface on the one end side in the circumferential direction of the other split core.
Furthermore, the rotating electrical machine disclosed in this application is
The stator formed of the split core described above;
The rotor is provided with a rotor disposed opposite to the stator with a gap interposed therebetween.
Furthermore, the method for manufacturing a split core disclosed in this application includes:
The method for manufacturing the split core described above,
In the process of punching out electrical steel sheets,
When punching out the two split cores,
At a position where the base of one of the split cores contacts the corner of the other split core,
The entire inner circumferential surface of the back yoke portion of one of the split cores is along the outer circumferential surface of the back yoke portion of the other split core, and
All of the other end surfaces of the teeth portions of one of the split cores are punched out along the one end surface of the other split core.
Furthermore, the method for manufacturing a rotating electric machine disclosed in the present application includes:
forming the stator with the split core;
A rotor is installed opposite the stator with a gap in between.

According to the split core, the rotating electrical machine, the split core manufacturing method, and the rotating electrical machine manufacturing method disclosed in the present application, the split core and the rotating electrical machine can be formed at low cost.

FIG. 3 is a plan view showing the configuration of a split core according to the first embodiment. FIG. 2 is a plan view showing the configuration of a stator core formed by the split cores shown in FIG. 1. FIG. FIG. 2 is a cross-sectional view showing the configuration of a rotating electric machine formed of the split cores shown in FIG. 1. FIG. FIG. 2 is a plan view showing a method of manufacturing the split core shown in FIG. 1; FIG. 2 is a plan view showing another method of manufacturing the split core shown in FIG. 1; FIG. 2 is a plan view showing another method of manufacturing the split core shown in FIG. 1; 7 is a plan view showing the configuration of a split core according to a second embodiment. FIG. 8 is a plan view showing the configuration of a stator core formed by the split cores shown in FIG. 7. FIG. FIG. 8 is a plan view showing a state in which two divided cores shown in FIG. 7 are arranged. FIG. 7 is a plan view showing the configuration of a split core according to Embodiment 3; 11 is a plan view showing the configuration of a stator core formed of the split cores shown in FIG. 10. FIG. FIG. 11 is a plan view showing a state in which two divided cores shown in FIG. 10 are arranged. FIG. 7 is a plan view for explaining a problem with a divided core of a comparative example. FIG. 3 is a plan view showing another configuration of the split core according to the first embodiment. FIG. 15A is a plan view showing a state before processing the split core of Embodiment 1, and FIG. 15B is a plan view showing a state after processing the split core shown in FIG. 15A. FIG. 7 is a plan view showing another configuration of the core.

In this embodiment, each direction in the rotating electrical machine is shown as a circumferential direction Z, an axial direction Y, a radial direction X, an outer side X1 of the radial direction X, and an inner side X2 of the radial direction X. Therefore, the divided cores constituting the rotating electrical machine will also be described with reference to these directions.

Embodiment 1.
FIG. 1 is a plan view showing the configuration of a divided core according to the first embodiment. FIG. 2 is a plan view showing the configuration of a stator core formed of the split cores shown in FIG. 1. FIG. 3 is a cross-sectional view showing the configuration of a rotating electrical machine formed of split cores according to the first embodiment. FIG. 4 is a plan view showing a method of manufacturing the split core shown in FIG. 1. 5 and 6 are plan views showing another method of manufacturing the split core shown in FIG. 1.

As shown in FIG. 3, the rotating electric machine 30 is formed by installing a stator 32 and a rotor 33 within a frame 31. As shown in FIG. The rotor 33 is disposed opposite to the stator 32 with a gap in between, and is assembled into the frame 31 using a bracket 35 on which a bearing 34 is installed. The stator 32 is formed by winding a coil 36 around a stator core 11, which will be described later.

As shown in FIG. 2, the stator core 11 is formed of a plurality of divided cores 1 in the circumferential direction Z. Therefore, the stator core 11 is configured by arranging a plurality of divided cores 1 in an annular shape. Each divided core 1 is formed in the same shape. As shown in FIG. 1, the split core 1 includes a back yoke portion 3 extending in the circumferential direction Z, and teeth portions 2 protruding from one end side Z1 of the back yoke portion 3 in the circumferential direction Z to an inner side X2 in the radial direction X. and has. Note that one end side Z1 in the circumferential direction Z is a direction shown with respect to one divided core 1, and the other end side will be shown and explained as the other end side Z2 in the circumferential direction Z.

The split core 1 has, as cut surfaces, an inner circumferential surface 7 on the inner side X2 of the back yoke portion 3 in the radial direction X, an outer circumferential surface 6 on the outer side X1 of the back yoke portion 3 in the radial direction the first other end surface 4 as the other end surface of the other end side Z2 of the split core 1, the one end surface 5 of the one end side Z1 of the split core 1 in the circumferential direction Z; 2 other end surface 8, and a tip surface 9 on the inner side X2 of the tooth portion 2 in the radial direction X.

In the split core 1, the root of the teeth 2 on the inner peripheral surface 7 of the back yoke portion 3 is a root portion 301, and one end side Z1 of the outer peripheral surface 6 of the back yoke portion 3 in the circumferential direction Z is a corner portion 302. . For example, as shown in FIG. 4, when two split cores 1 are arranged with the root 301 of one split core 13 touching the corner 302 of the back yoke part 3 of the other split core 14, one The entire inner circumferential surface 7 of the back yoke portion 3 of the split core 13 is formed in a shape along the outer circumferential surface 6 of the back yoke portion 3 of the other split core 14 . Furthermore, the entire first other end surface 4 of the teeth portion 2 of one split core 13 is formed in a shape along one end surface 5 of the other split core 14 .

Note that the entire inner circumferential surface 7 of the back yoke portion 3 of one split core 13 has a shape that follows the outer circumferential surface 6 of the back yoke portion 3 of the other split core 14, and the teeth portion 2 of one split core 13 The shape in which all of the first other end surfaces 4 of There is a gap between the cores 13 and 14 that allows the mold to pass through. Also, in each figure, there is a gap between two adjacent split cores 13 and 14 that is large enough for the mold to pass through, but because the gap is small, the gap is not shown in the figures. . In the following embodiments as well, the term "shape to follow" has the same meaning, so the explanation thereof will be omitted as appropriate.

In order to configure this, specifically, the outer circumferential surface 6 of the back yoke portion 3 and the inner circumferential surface 7 of the back yoke portion 3 are formed with the same radius of curvature. Furthermore, one end surface 5 of the split core 1 is arranged along the radial direction X. One end surface 5 of the split core 1 and the first other end surface 4 of the teeth portion 2 are formed in parallel.

Since the rotating electrical machine 30 is constructed by inserting the stator 32 into the frame 31, the radius of curvature of the outer circumferential surface 6 of the split core 1 and the radius of curvature of the inner surface of the frame 31 need to match. Therefore, the radius of curvature of the outer peripheral surface 6 of the split core 1 is uniquely determined. Furthermore, the radius of curvature of the inner circumferential surface 7 of the split core 1 needs to match the radius of curvature of the outer circumferential surface 6. If the radius of curvature of the outer circumferential surface 6 of the split core 1 is designed together with the radius of curvature of the inner circumferential surface 7 of the split core 1, which is different from the above, the frame 31 of the rotating electrical machine 30 and the outer circumferential surface 6 of the split core 1 will match. Therefore, the roundness of the stator 32 cannot be ensured.

In this way, since the radius of curvature of the outer circumferential surface 6 of the split core 1 is made to match the radius of curvature of the inner circumferential surface 7, the length W2 of the back yoke portion 3 of the second other end surface 8 is The length W1 of the back yoke portion 3 is shorter than the length W1 of the back yoke portion 3. In a normal rotating electrical machine 30, the length of the back yoke portion 3 in the radial direction .

As shown in FIG. 2, the angle θ1 between the second other end surface 8 and one end surface 5 of the split core 1 and the center point Q of the stator core 11 needs to match the angle θ1 for each split core. If the angle θ1 formed by the second other end surface 8 and the one end surface 5 is larger or smaller than the angle θ1 per split core, roundness cannot be ensured when the split cores 1 are assembled to form the stator core 11. It is.

Next, a method for manufacturing the split core of the first embodiment configured as described above and a method for manufacturing the rotating electrical machine will be described using FIG. 4. The production of the split core 1 according to the first embodiment is carried out in a step of punching out an electromagnetic steel sheet using a mold for forming the split core 1. Generally, the split core 1 of the rotating electrical machine 30 is manufactured by punching out a roll of magnetic steel sheet using a press.

As shown in FIG. 4, in the punching process, the electromagnetic steel sheet 17 flows in the direction indicated by the feeding direction A. First, a portion of the outer circumferential surface 6 and a portion of the one end surface 5 of one split core 13 are cut at a cutting position B from arrow to arrow shown by dotted lines. Next, the entire inner circumferential surface 7 and the entire first other end surface 4 of one split core 13 are cut at a cutting position BB shown by a dotted line from arrow to arrow. At this cutting position BB, a portion of the outer peripheral surface 6 and a portion of the one end surface 5 of the other split core 14 are simultaneously cut. When the base 301 of one split core 13 and the corner 302 of the back yoke part 3 of the other split core 14 are placed in contact with each other, the inner circumferential surface 7 of the back yoke part 3 of one split core 13 This is because all of them are formed in a shape that follows the outer circumferential surface 6 of the back yoke portion 3 of the other split core 14. Furthermore, this is because the entire first other end surface 4 of the teeth portion 2 of one of the split cores 13 is formed in a shape that follows the one end surface 5 of the other split core 14 .

Next, the entire second other end surface 8 of one split core 13 and the remaining portion of the outer circumferential surface 6 of the other split core 14 are cut at the first cutting portion 15 . Furthermore, the entire tip surface 9 of one split core 13 and the remaining portion of one end surface 5 of the other split core 14 are cut at the second cutting portion 16 . By repeating these operations, a plurality of split cores 1 can be manufactured. Note that cutting at cutting position B and cutting position BB can be performed using the same die.

Furthermore, if it is desired to improve the dimensional accuracy of the split core 1, holes 20 may be formed at both ends of the electromagnetic steel plate 17 into which pilot pins for conveying the electromagnetic steel plate 17 are inserted, as shown in FIG. Then, the split core 1 is manufactured in the same manner as in the above case. In this case, the dimensional accuracy of the split core 1 improves, but the width of the electromagnetic steel sheet 17 becomes larger due to the hole 20 compared to the above case (the case of FIG. 4), and the amount of electromagnetic steel sheet 21 that is additionally discarded increases. This increases material costs.

FIG. 6 shows an example where it is desired to downsize the mold for forming the split core 1 compared to the above case. In the above case, after cutting a portion of the outer circumferential surface 6 and a portion of the one end surface 5 of one split core 13, the first cut portion 15 and the second cut portion 16 are cut, so the process is divided into two steps. Therefore, the mold becomes large.

On the other hand, as shown in FIG. 6, all of the outer circumferential surface 6, one end surface 5, second other end surface 8, and distal end surface 9 of the split core 13 on the cut side are cut. Next, the outer circumferential surface 6, one end surface 5, second other end surface 8, and tip surface 9 of the other split core 14 are all cut at cutting positions FF shown by solid lines from arrow to arrow. At this cutting position FF, the inner circumferential surface 7 and the first other end surface 4 of one split core 13 are all cut at the same time. This makes it possible to cut one split core 13 and the other split core 14 with fewer steps and a smaller number of molds than in the above case, so it is possible to downsize the press mold. Then, a triangular residual material 23 that is continuous in the feeding direction A of the electromagnetic steel sheet 17 is generated.

If the remaining material 23 is not continuous in the feeding direction A, it will scatter inside the press, and in the worst case, it will get caught in the press, causing the equipment to stop. Therefore, in order to connect the remaining material 23, the width of the electromagnetic steel sheet 17 is made slightly wider. As a result, the width of the electromagnetic steel sheet 17 needs to be increased by about 2 mm compared to the case shown in FIG.

In any of the above methods, one split core 13 and the other split core 14 are separated, the entire inner circumferential surface 7 of the back yoke portion 3 of one split core 13 is Since it is possible to cut along the outer circumferential surface 6 of the yoke portion 3 and also to cut the entire first other end surface 4 of the teeth portion 2 of one split core 13 along the one end surface 5 of the other split core 14, The cutting length of each split core 1 can be reduced to about half compared to the case where the entire length of the outer shape of each split core 1 is cut out. As a result, the Ton number of the press machine used for cutting can be halved, making it possible to suppress capital investment. Moreover, the amount of electromagnetic steel sheet 17 that is not used for punching the split core 1 can be reduced compared to the conventional case, and the material cost of the split core 1 and, by extension, the cost of the rotating electric machine 30 can be reduced.

The stator core 11 is formed by stacking split cores 1 manufactured by any of the methods in the axial direction Y, and assembling the stacked split cores 1 into an annular shape. Next, the coil 36 is installed on the stator core 11 and then inserted into the frame 31. Next, the rotor 33 is inserted, the bracket 35 with the bearing 34 is assembled, and the rotating electric machine 30 is completed.

Unlike Embodiment 1, the split core shown in FIG. The entire inner peripheral surface of the back yoke portion is formed in a shape that does not follow the outer peripheral surface of the back yoke portion of the other split core. Furthermore, all of the first other end surfaces of the teeth portions of one of the divided cores are formed in a shape that does not follow one end surface of the other divided core. In this case, a gap C or an overlap D occurs between one divided core and the other divided core.

Therefore, even if manufactured in the same manner as in Embodiment 1, the gap C between one split core and the other split core may be cut by pressing again, or the split cores may be cut so that the overlap D does not occur. It is necessary to manufacture them further apart from each other, resulting in high mold costs and complicated processes, resulting in high costs. Furthermore, the yield of electrical steel sheets deteriorates.

In order to receive more magnetic flux from the rotor 33, as shown in FIG. 14 or 15, the tip of the inner side X2 of the tooth portion 2 in the radial direction You may. Specifically, as shown in FIG. 1, the tip of the inner side X2 of the tooth portion 2 of the punched split core 1 in the radial direction X is bent in the bending direction G to be plastically deformed to form the protruding portion 51. Alternatively, as shown in FIG. 15A, the notches 52 are formed at the same time as the split core 1 is punched out. Then, the protruding portion 53 is formed by bending and plastically deforming it in the bending direction G. If the notch 52 is formed, the thin wall portion can be more easily plastically deformed than the case shown in FIG.

With this configuration, the magnetic flux from the rotor 33 can also be picked up from the protrusion 51 or the protrusion 53. Therefore, the utilization rate of the magnetic flux from the rotor 33 is improved, and the torque of the rotating electric machine 30 can be increased.

According to the split core, rotating electrical machine, split core manufacturing method, and rotating electrical machine manufacturing method of Embodiment 1 configured as described above,
In a divided core in which a stator core that constitutes a stator of a rotating electric machine is divided into multiple pieces in the circumferential direction,
Each of the divided cores is
a back yoke portion extending in the circumferential direction;
and teeth portions protruding inward in the radial direction from one end side in the circumferential direction of the back yoke portion,
Any two of the divided cores,
The base of the tooth portion on the radially inner inner circumferential surface of the back yoke portion of one of the split cores, and the circumferentially outer circumferential surface of the back yoke portion of the other split core on the radially outer side. When placed with the corner of one end in contact,
The entire inner circumferential surface of the back yoke portion of one of the split cores is formed in a shape that follows the outer circumferential surface of the back yoke portion of the other split core, and
Since the entire other end surface of the tooth portion of one of the split cores on the other end side in the circumferential direction is formed in a shape along the one end surface of the other split core on the one end side of the circumferential direction,
Furthermore, the stator is formed of a split core;
The stator is provided with a rotor disposed opposite to the stator with a gap therebetween,
Furthermore, a method for manufacturing a split core,
In the process of punching out electrical steel sheets,
When punching out the two split cores,
At a position where the base of one of the split cores contacts the corner of the other split core,
The entire inner circumferential surface of the back yoke portion of one of the split cores is along the outer circumferential surface of the back yoke portion of the other split core, and
Since all of the other end surfaces of the teeth portions of one of the split cores are punched out along the one end surface of the other split core,
Furthermore, the stator is formed by the split core,
Since the rotor is installed opposite to the stator with a gap in between,
The yield of electromagnetic steel sheets is improved and the amount of electromagnetic steel sheets used can be reduced, resulting in lower costs for split cores and rotating electric machines.

Further, the outer circumferential surface of the back yoke portion and the inner circumferential surface of the back yoke portion are formed with the same radius of curvature,
The one end surface of the split core is formed along a radial direction,
Since the one end surface of the split core and the other end surface of the teeth portion are formed in parallel,
The amount of electromagnetic steel sheets used can be definitely reduced.

Further, the outer circumferential surface of the back yoke portion and the inner circumferential surface of the back yoke portion are formed with the same radius of curvature,
Since the one end surface of the split core is formed along the radial direction,
The amount of electromagnetic steel sheets used can be definitely reduced.

Furthermore, since the one end surface of the split core is formed along the radial direction,
The amount of electromagnetic steel sheets used can be definitely reduced.

Furthermore, the teeth portion includes a protrusion portion that is bent such that a radially inner tip of the teeth portion protrudes toward the other end side in the circumferential direction,
Further, since the radially inner tips of the teeth portions of the punched split core are bent so as to protrude toward the other end in the circumferential direction to form the protruding portions,
The protrusion improves the utilization rate of the magnetic flux from the rotor and increases the torque of the rotating electric machine.

Embodiment 2.
FIG. 7 is a plan view showing the configuration of a split core according to the second embodiment. FIG. 8 is a plan view showing the configuration of a stator core formed of the split cores shown in FIG. 7. FIG. 9 is a plan view showing two divided cores shown in FIG. 7 arranged side by side. In each figure, the same parts as in Embodiment 1 are given the same reference numerals, and their explanation will be omitted.

In the first embodiment, the split core 1 having an L shape was shown, but in the second embodiment, a split core 1 having a Z shape will be described. In FIG. 7, a shoe portion 24 that protrudes toward one end Z1 in the circumferential direction Z is provided on one end Z1 in the circumferential direction Z of the inner side X2 in the radial direction X of the tooth portion 2. The split core 1 has, as a cut surface, a shoe end surface 25 on one end side Z1 of the shoe portion 24 in the circumferential direction Z, and a shoe outer peripheral surface 27 on the outside X1 of the shoe portion 24 in the radial direction X.

The length W3 of the one end surface 5 of the split core 1 from the corner 302 to the shoe portion 24 on the inside in the radial direction X The length W4 up to X2 is the same length. Therefore, as shown in FIG. 9, when two split cores 1 are arranged with the base 301 of one split core 13 in contact with the corner 302 of the back yoke part 3 of the other split core 14, the above-mentioned result is obtained. As in the first embodiment, the entire inner circumferential surface 7 of the back yoke portion 3 of one split core 13 is along the outer circumferential surface 6 of the back yoke portion 3 of the other split core 14; The entire first other end surface 4 of the teeth portion 2 is along one end surface 5 of the other split core 14 . Furthermore, in the second embodiment, a portion of the distal end surface 9 of one split core 13 is formed along the entire shoe outer peripheral surface 27 of the shoe portion 24 of the other split core 14.

In this way, the Z-shaped split core 1 is composed of the back yoke section 3, the teeth section 2, and the shoe section 24. A stator core 11 is configured as shown in FIG. 8 by assembling a plurality of Z-shaped split cores 1 in an annular shape as in the first embodiment. Further, at the time of cutting, the positional relationship between one split core 13 and the other split core 14 is as shown in FIG. 9, so that the split core 1 can be manufactured in the same manner as in the first embodiment.

According to the split core, rotating electrical machine, split core manufacturing method, and rotating electrical machine manufacturing method of Embodiment 2 configured as described above, the same effects as in Embodiment 1 can be obtained, and
A shoe portion that protrudes toward one end in the circumferential direction is provided on one end in the circumferential direction inside the tooth portion in the radial direction.
In the case where the shoe portion is provided, the amount of electromagnetic steel sheet used can be similarly reduced, so that the cost of the split core and the rotating electric machine can be reduced.

Furthermore, a length of the one end surface of the split core from the corner to the radially inner shoe part;
Since the length of the other end surface of the tooth portion from the root portion to the inside in the radial direction is the same length,
Since the shoe portion can also be cut along, it is possible to reliably reduce the amount of electromagnetic steel sheet used, resulting in lower costs for the split core and the rotating electric machine.

Embodiment 3.
FIG. 10 is a plan view showing the configuration of a divided core according to the third embodiment. FIG. 11 is a plan view showing the configuration of a stator core formed by the split cores shown in FIG. 10. FIG. 12 is a plan view showing two divided cores shown in FIG. 10 arranged side by side. In each figure, the same parts as those in each of the above embodiments are designated by the same reference numerals, and the explanation thereof will be omitted.

In the third embodiment, unlike the second embodiment, a case is shown in which the space 29 (see FIG. 11) for winding the coil 36 is expanded. For this reason, the shoe portion 240 is formed smaller than that of the second embodiment.

In FIG. 10, a shoe portion 240 that protrudes toward one end Z1 in the circumferential direction Z is provided on one end Z1 in the circumferential direction Z of the inner side X2 in the radial direction X of the tooth portion 2. The split core 1 has, as a cut surface, a shoe end surface 250 on one end side Z1 of the shoe portion 24 in the circumferential direction Z, and a shoe outer peripheral surface 270 on the outside X1 of the shoe portion 24 in the radial direction X.

Since the shoe portion 240 is formed smaller than in the second embodiment, the length W30 of the one end surface 5 of the split core 1 from the corner portion 302 to the shoe portion 240 on the inside X2 in the radial direction The length W40 of the first other end surface 4 of the portion 2 from the root portion 301 to the inner side X2 in the radial direction X is longer than the length W40.

Therefore, as shown in FIG. 12, when two split cores 1 are arranged with the root 301 of one split core 13 in contact with the corner 302 of the back yoke part 3 of the other split core 14, the above-mentioned result is obtained. As in each embodiment, the entire inner circumferential surface 7 of the back yoke portion 3 of one split core 13 is along the outer circumferential surface 6 of the back yoke portion 3 of the other split core 14. The entire first other end surface 4 of the teeth portion 2 is along one end surface 5 of the other split core 14 . However, in the third embodiment, unlike the second embodiment, the distal end surface 9 of one split core 13 does not align with the shoe outer peripheral surface 270 of the shoe portion 240 of the other split core 14.

In this way, the Z-shaped split core 1 is composed of the back yoke section 3, the teeth section 2, and the shoe section 240. A stator core 11 is configured as shown in FIG. 12 by assembling a plurality of Z-shaped split cores 1 in an annular shape as in each of the above embodiments. Further, since the positional relationship between one split core 13 and the other split core 14 is as shown in FIG. 12, the split core 1 can be manufactured in the same manner as in each of the above embodiments.

Unlike the second embodiment described above, the length W30 of the one end surface 5 of the split core 1 from the corner 302 to the shoe portion 240 on the inside X2 in the radial direction Since there is no need to consider the length W40 from the portion 301 to the inner side X2 in the radial direction X, the degree of freedom in the shape of the shoe portion 240 is improved.

According to the split core, rotating electrical machine, split core manufacturing method, and rotating electrical machine manufacturing method of Embodiment 3 configured as described above, the same effects as in each of the embodiments described above can be achieved. However, compared to each of the embodiments described above, as shown in FIG. 12, there are portions where the divided cores do not align with each other. Therefore, compared to each of the embodiments described above, the effect of reducing material costs is reduced. However, the degree of freedom in the shape of the shoe portion is improved, and the space for winding the coil can be expanded.

Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments may be applicable to a particular embodiment. The present invention is not limited to, and can be applied to the embodiments alone or in various combinations.
Therefore, countless variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, this includes cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of other embodiments.

1 Split core, 11 Stator core, 13 One split core, 14 Other split core, 15 First cut portion, 16 Second cut portion, 17 Electromagnetic steel plate, 2 Teeth portion, 20 Hole portion, 23 Remaining material, 24 Shoe portion , 240 shoe part, 25 one end surface of the shoe, 250 one end surface of the shoe, 27 outer circumferential surface of the shoe, 270 outer circumferential surface of the shoe, 29 space, 3 back yoke section, 30 rotating electric machine, 301 root section, 302 corner section, 31 frame, 32 stator , 33 rotor, 34 bearing, 35 bracket, 36 coil, 4 first other end surface, 5 one end surface, 51 protrusion, 52 notch, 53 protrusion, 6 outer peripheral surface, 7 inner peripheral surface, 8 second other end surface, 9 Tip surface, A feeding direction, B cutting position, BB cutting position, F cutting position, FF cutting position, C gap, D overlap, G bending direction, X radial direction, X1 outside, X2 inside, Y axial direction, Z circumference Direction, Z1 one end side, Z2 other end side, W1 length, W2 length, W3 length, W30 length, W4 length, W40 length.

Claims (10)

In a divided core in which a stator core that constitutes a stator of a rotating electric machine is divided into multiple pieces in the circumferential direction,
Each of the divided cores is
a back yoke portion extending in the circumferential direction;
and teeth portions protruding inward in the radial direction from one end side in the circumferential direction of the back yoke portion,
Any two of the divided cores,
The base of the tooth portion on the radially inner inner circumferential surface of the back yoke portion of one of the split cores, and the circumferentially outer circumferential surface of the back yoke portion of the other split core on the radially outer side. When placed with the corner of one end in contact,
The entire inner circumferential surface of the back yoke portion of one of the split cores is formed in a shape that follows the outer circumferential surface of the back yoke portion of the other split core, and
A split core in which the entire other end surface on the other end side in the circumferential direction of the teeth portion of one of the split cores is formed in a shape along one end surface on the one end side in the circumferential direction of the other split core. The outer circumferential surface of the back yoke portion and the inner circumferential surface of the back yoke portion are formed with the same radius of curvature,
The split core according to claim 1, wherein the one end surface of the split core is formed along a radial direction. The split core according to claim 1 or 2, wherein the one end surface of the split core and the other end surface of the teeth portion are formed in parallel. The split core according to any one of claims 1 to 3, further comprising a shoe portion projecting toward one end in the circumferential direction on one end in the circumferential direction inside the teeth portion in the radial direction. a length of the one end surface of the split core from the corner to the radially inner shoe part;
The split core according to claim 4, wherein the length of the other end surface of the tooth portion from the root portion to the inner side in the radial direction is the same length. 4 . The tooth portion according to claim 1 , wherein the tooth portion includes a protruding portion that is bent such that a radially inner tip of the tooth portion protrudes toward the other end in the circumferential direction. Split core. The stator formed of the split core according to any one of claims 1 to 6,
A rotating electric machine including a rotor disposed opposite to the stator with a gap therebetween. A method for manufacturing a split core according to any one of claims 1 to 7, comprising:
In the process of punching out electrical steel sheets,
When punching out the two split cores,
At a position where the base of one of the split cores contacts the corner of the other split core,
The entire inner circumferential surface of the back yoke portion of one of the split cores is along the outer circumferential surface of the back yoke portion of the other split core, and
A method for manufacturing a split core, in which all of the other end surfaces of the teeth portions of one of the split cores are punched out along the one end surface of the other split core. A method for manufacturing a split core according to claim 6, comprising:
In the split core manufacturing method according to claim 8, the radially inner tip of the teeth portion of the split core punched out is bent to protrude toward the other end in the circumferential direction to form the protrusion. How to manufacture the core. forming the stator with the split core;
The method for manufacturing a rotating electric machine according to claim 8 or 9, wherein a rotor is installed opposite to the stator with a gap therebetween.

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