JP6621058B2 - Rotating electric machine and method of manufacturing rotating electric machine - Google Patents

Description

  Embodiments disclosed herein relate to a rotating electrical machine and a method for manufacturing the rotating electrical machine.

  There is known a rotating electric machine in which a plurality of divided iron cores constituting a stator iron core are fixed inside a frame by shrink fitting or press fitting. In such a configuration, due to variations in the inner diameter and thickness of the frame, the outer diameter of the split core, etc., non-uniform compressive stress and strain may occur in the split core, leading to an increase in iron loss, etc. There is sex.

  On the other hand, for example, Patent Document 1 describes a rotating electrical machine in which a stator core is press-fitted into an inner periphery of a frame so that only an outer peripheral portion of a joint portion between split iron cores is pressed into an inner periphery of the frame.

JP 2006-340509 A (FIG. 6)

  In the prior art described above, a gap is formed between the split iron core and the frame at a portion other than the joint portion, so that the uneven compressive stress and strain generated in the split iron core described above can be reduced. However, since only the joint portion having relatively low rigidity is supported by the frame in the split core, when a large compressive force is applied to the outer peripheral surface of the stator core from the frame, a part of the split core is deformed and the stator. There was a possibility that the cylindrical accuracy of the iron core was broken and the gap between the stator and the rotor was changed.

  The present invention has been made in view of such problems, and even when a large compressive force is applied from the frame to the outer periphery of the stator core, it is possible to suppress the occurrence of uneven compressive stress, strain, or the like in the split core. An object of the present invention is to provide a rotating electrical machine and a method of manufacturing the rotating electrical machine that are capable of ensuring the cylindrical accuracy of the stator core.

In order to solve the above problems, according to one aspect of the present invention, there is provided a frame, and a stator core having a plurality of divided cores fixed to the inner peripheral surface of the frame and arranged in the circumferential direction. The split cores have contact surfaces that come into contact with the adjacent split cores at both ends in the circumferential direction, and the stator core has a radially outer side of the contact surface on the outer peripheral surface. A first recess provided in a part of the first recess, and the radial dimension of the stator core in the first recess provided in a part of the outer peripheral surface is a region other than the first recess. In which the split core has a first protrusion on the contact surface of the end portion on one side in the circumferential direction, and is in the circumferential direction. Adjacent to the contact surface of the end on the other side A second recess in which the first protrusion of the split iron core is accommodated, wherein the first protrusion has a cross-sectional shape orthogonal to the axial direction, and a radial width that decreases toward the tip of the one side; A rotating electrical machine having a taper shape and having a gap of a predetermined dimension between the tip of the first protrusion and the bottom of the second recess is applied.
According to another aspect of the present invention, there is provided a frame, and a stator core that is fixed to an inner peripheral surface of the frame and includes a plurality of divided cores arranged in a circumferential direction, and the divided core Each has a contact surface in contact with the adjacent split core at both ends in the circumferential direction, and the stator core is located in a region of the outer peripheral surface located on the radially outer side of the contact surface. The stator core has a first recess provided partially, and the radial dimension of the stator core in the first recess provided partially is the stator core in a region other than the first recess in the outer peripheral surface. The split iron core has a first protrusion on the contact surface of the end on one side in the circumferential direction, and the end on the other side in the circumferential direction. Of the split core adjacent to the contact surface of the part The first protrusion has a taper shape in which a cross-sectional shape perpendicular to the axial direction decreases in a radial direction toward the tip on the one side; A rotating electrical machine characterized in that a gap of a predetermined size is provided between a tip portion of the first protrusion and a bottom portion of the second recess so that the tip portion and the bottom portion face each other substantially in parallel. Applied.

Moreover, according to another viewpoint of this invention, it arrange | positions so that a some division | segmentation iron core may be connected to the circumferential direction, and it exists in the area | region located in the radial direction outer side of the contact surface which the said division iron cores contact among outer peripheral surfaces. A stator core partially provided with a first recess, wherein the radial dimension of the stator core in the partially provided first recess is in a region other than the first recess in the outer peripheral surface. the rather smaller than the radial dimension of the stator core, and the divided core has a first protrusion on the contact surface of the end of one side in the circumferential direction, the end of the other side in the circumferential direction The contact surface of the part has a second recess in which the first projecting part of the adjacent divided core is accommodated, and the first projecting part has a cross-sectional shape orthogonal to the axial direction and a radial width. The first protrusion has a tapered shape that decreases toward the tip of the one side. Between the tip and the bottom of the second recess, a predetermined gap is provided, and forming the stator core is fixed by shrink fitting the frame on the outside of the stator core And a method of manufacturing a rotating electrical machine having the above.
Moreover, according to another viewpoint of this invention, it arrange | positions so that a some division | segmentation iron core may be connected to the circumferential direction, and it exists in the area | region located in the radial direction outer side of the contact surface which the said division iron cores contact among outer peripheral surfaces. A stator core partially provided with a first recess, wherein the radial dimension of the stator core in the partially provided first recess is in a region other than the first recess in the outer peripheral surface. It is smaller than the radial dimension of the stator core, and the split core has a first protrusion on the contact surface at one end in the circumferential direction, and the other end in the circumferential direction. The contact surface has a second recess in which the first projection of the adjacent split core is accommodated, and the first projection has a cross-sectional shape perpendicular to the axial direction and a radial width of the first projection. The first protrusion has a tapered shape that decreases toward the tip on one side. Forming the stator core, wherein a gap of a predetermined dimension is provided between the front end of the second recess and the bottom of the second recess so that the front end and the bottom face each other substantially in parallel, and the fixing There is provided a method of manufacturing a rotating electrical machine, comprising: fixing a frame to the outside of a core core by shrink fitting.

  According to still another aspect of the present invention, a frame, a stator core that is fixed to an inner peripheral surface of the frame and includes a plurality of divided cores arranged in a circumferential direction, and the divided cores contact each other. A rotating electrical machine having means for forming a gap between the outer peripheral surface of the stator core and the inner peripheral surface of the frame is applied at a position corresponding to the contact surface.

  According to the present invention, even when a large compressive force is applied from the frame to the outer periphery of the stator core of the rotating electrical machine, it is possible to suppress the occurrence of uneven compressive stress or strain in the split core, and the stator core Cylindrical accuracy can be ensured.

It is an axial sectional view showing an example of the whole composition of the rotation electrical machinery concerning one embodiment. It is a cross-sectional view by the II-II cross section of FIG. 1 showing an example of the whole structure of the rotary electric machine which concerns on one Embodiment. It is explanatory drawing which extracts and represents a part of stator iron core which the division | segmentation iron core arranged in the circumferential direction. It is explanatory drawing which extracts and represents the vicinity of the contact surface of the division | segmentation iron core adjacent to the circumferential direction. It is explanatory drawing which extracts and represents a part of stator core in which the split iron core of the comparative example 1 was located in the circumferential direction. It is explanatory drawing which extracts and represents the vicinity of the contact surface of the division | segmentation iron core adjacent to the circumferential direction in the modification which the contact surface of the edge part of the both sides in the circumferential direction is flat. In the modification in which the first protrusion of the contact surface at one end in the circumferential direction and the second recess of the contact surface at the other end are substantially rectangular in cross section, the contact surface of the split iron core adjacent in the circumferential direction It is explanatory drawing which extracts and represents the vicinity.

  Hereinafter, an embodiment will be described with reference to the drawings. In the following, for convenience of description of the configuration of the rotating electrical machine and the like, directions such as up and down, left and right, front and rear may be used as appropriate, but the positional relationship of each configuration of the rotating electrical machine and the like is not limited.

<1. Overall configuration of rotating electrical machine>
An example of the overall configuration of the rotating electrical machine 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is an axial cross-sectional view showing an example of the overall configuration of the rotating electrical machine 1, and FIG. 2 is a transverse cross-sectional view taken along the line II-II in FIG. 1 showing an example of the overall configuration of the rotating electrical machine 1.

  As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes a stator 2, a rotor 3, a frame 4, a load side bracket 11, and an anti-load side bracket 13. The rotating electrical machine 1 is used as a motor or a generator.

  The rotor 3 includes a shaft 10, a rotor core 15 provided on the outer periphery of the shaft 10, and a plurality of permanent magnets (not shown) disposed on the rotor core 15. The rotor core 15 is configured by laminating a plurality of electromagnetic steel plates in the axial direction, and is disposed so as to face the stator 2 in the radial direction.

  The load side bracket 11 is fixed to the load side (right side in FIG. 1) of the frame 4, and the anti-load side bracket 13 is fixed to the anti load side (left side in FIG. 1) of the frame 4. The shaft 10 is rotatably supported around the rotation axis AX by a load side bearing 12 provided on the load side bracket 11 and an antiload side bearing 14 provided on the antiload side bracket 13.

  In this specification, the “load side” refers to the direction in which a load is attached to the rotating electrical machine 1, that is, the direction in which the shaft 10 protrudes (right side in FIG. 1) in this example. It points in the opposite direction to the load side (left side in FIG. 1).

  In this specification, “axial direction” refers to the direction along the rotational axis AX of the shaft 10 (rotor 3), “circumferential direction” refers to the circumferential direction around the rotational axis AX, and “diameter”. The “direction” refers to a radial direction around the rotation axis AX.

  The stator 2 is disposed on the inner peripheral side of the frame 4 so as to face the rotor 3 in the radial direction. The stator 2 includes a stator core 5 provided on the inner peripheral surface of the frame 4, a bobbin 6 attached to the stator core 5, a winding 7 wound around the bobbin 6, and a resin portion 35. Have. The bobbin 6 is made of an insulating material in order to electrically insulate the stator core 5 and the winding 7 from each other. The bobbin 6 may be a sheet-like insulator.

  As shown in FIG. 2, the stator core 5 is configured by combining a plurality (12 in the illustrated example) of divided cores 20 (also referred to as core pieces) in the circumferential direction. Each divided iron core 20 is configured by laminating a plurality of electromagnetic steel plates formed in a predetermined shape by, for example, press punching in the axial direction. The split iron core 20 includes a substantially arc-shaped yoke portion 21 and a teeth portion 22 provided integrally with the yoke portion 21. The teeth part 22 is provided with a main body part 22a provided so as to protrude radially inward from the yoke part 21, and a widened part 22b provided at the front end on the inner peripheral side of the main body part 22a and having an increased circumferential width. And have. In the example shown in FIG. 2, the tips of adjacent widened portions 22b are separated in the circumferential direction, but may be in contact with each other.

  After the bobbin 6 and the winding 7 are mounted on the tooth portion 22, the divided cores 20 are connected in the circumferential direction to form the stator core 5. Then, after the stator core 5 is fixed to the inner peripheral surface of the frame 4 by press fitting or shrink fitting, it is molded with resin. As a result, as shown in FIG. 1, the stator core 5 (divided core 20), the bobbin 6, and the winding 7 are integrally fixed by a resin portion 35 made of resin.

  As shown in FIG. 2, the windings 7 attached to the respective tooth portions 22 are accommodated in the slot portions 19 between the teeth portions 22 adjacent in the circumferential direction, and the opposite sides of the winding layers of the windings 7. The parts are arranged with a gap 19a therebetween. Resin is press-fitted into the gap 19a at the time of molding, and the resin portion 35 is filled. In addition, resin is press-fitted into the core groove 18 and the first recess 30 (described later) of each divided iron core 20 at the time of molding, and the resin portion 35 is filled.

  As shown in FIG. 1, substantially annular projecting portions 35 a and 35 b are formed on the load side end portion and the anti-load side end portion of the resin portion 35, respectively. These protrusions 35a and 35b are inlay-fitted to the load side bracket 11 and the anti-load side bracket 13, respectively.

<2. Detailed structure of split core>
An example of the detailed structure of the split iron core will be described with reference to FIGS. 3 and 4. FIG. 3 is an explanatory view showing a part of the rotor core in which the divided cores are arranged in the circumferential direction. FIG. 4 is an explanatory view showing the vicinity of the contact surface of the divided cores adjacent in the circumferential direction. 3 and 4, the bobbin 6 and the resin portion 35 are not shown.

  As shown in FIGS. 3 and 4, the split iron core 20 has an arcuate yoke portion 21 and a teeth portion 22. The teeth part 22 has a main body part 22a and a widened part 22b. A core groove 18 is formed on the outer peripheral surface of the split iron core 20 along the axial direction at the center in the circumferential direction. The core groove 18 is provided to reduce stress concentration on the slot portion 19 when the stator core 5 is attached to the inner peripheral surface of the frame 4 by shrink fitting or the like. The cross-sectional shape of the core groove 18 is, for example, a shape (isosceles trapezoidal shape, so-called dovetail shape) whose width in the circumferential direction increases toward the inside in the radial direction.

  As shown in FIG. 3, each divided iron core 20 has contact surfaces 24 and 26 that come into contact with the adjacent divided iron core 20 at both ends in the circumferential direction. That is, the divided iron cores 20 adjacent in the circumferential direction are connected with the contact surfaces 24 and 26 in contact with each other.

  The split iron core 20 has a first protrusion 23 on the contact surface 24 on one end (left side in FIG. 3) in the circumferential direction, and the contact surface on the other end (right side in FIG. 3) in the circumferential direction. 26 has a second recess 25. The second recess 25 accommodates the first protrusion 23 of the adjacent split iron core 20. The first protrusion 23 has a taper shape (substantially trapezoidal shape) in which the cross-sectional shape orthogonal to the axial direction decreases in the radial direction toward the tip on one side in the circumferential direction. The second recess 25 has the same shape as the first protrusion 23, and the cross-sectional shape orthogonal to the axial direction is such that the radial opening width decreases toward the tip on one side in the circumferential direction (substantially trapezoidal). Groove shape). As shown in FIG. 4, the first projecting portion 23 and the tapered portion of the second recess 25 are surely in contact between the tip of the first projecting portion 23 and the bottom of the second recess 25. A minute gap S is provided.

  Further, the split iron core 20 has two second protrusions 27 on both sides in the radial direction of the second recess 25 as a result of having the second recess 25 on the contact surface 26. The second projecting portion 27 has a cross-sectional shape orthogonal to the axial direction such that the radial width of the tip portion is smaller than the radial width of the root portion.

  A first recess 30 is formed on the outer peripheral surface of the stator core 5 at a position corresponding to the contact surfaces 24 and 26. Specifically, the first recess 30 has a predetermined width in the circumferential direction across the outer peripheral surface of the split core 20 having the first protrusion 23 and the outer peripheral surface of the split core 20 having the second recess 25. It is formed as follows. As shown in FIG. 4, the circumferential width La1 of the first recess 30 in the split core 20 having the second recess 25 (left split core 20 in FIG. 4) is the circumferential depth Lb of the second recess 25. (= Projection length in the circumferential direction of the second protrusion 27). Note that the circumferential width La2 of the first recess 30 in the divided iron core 20 having the first protrusion 23 (the right divided iron core 20 in FIG. 4) is not particularly limited, but in this example, the width La1 is used. It is almost the same. The width La1 and the width La2 may be different.

  In the first recess 30, a large compressive force is applied from the frame 4 to the outer peripheral surface of the stator core 5 by shrink fitting or the like, and the second protrusion on the radially outer side of the second recess 25 is formed by the taper shape of the first protrusion 23. When the portion 27 is deformed by being pushed outward in the radial direction, the second protrusion 27 is allowed to deform toward the frame 4. Thereby, the compressive force from the left and right divided iron cores 20 on the contact surfaces 24 and 26 can be relaxed, and the deformed second protrusion 27 can be prevented from receiving a reaction force from the frame 4. Accordingly, the depth of the first recess 30 in the radial direction is set to a depth that allows the deformation of the second protrusion 27.

  The cross-sectional shape of the corner R1 located between the first recess 30 and the outer peripheral surface of the stator core 5 (in other words, in contact with the inner peripheral surface of the frame 4) is the compressive force from the frame 4. Thus, the shape is chamfered in an arc shape so that stress concentration does not occur in the corner portion R1. Further, the cross-sectional shape of the corner portion R2 located on both sides in the circumferential direction of the bottom portion of the first recess 30 is similarly a chamfered shape in an arc shape. Further, the cross-sectional shape of each corner and each corner (indicated by reference numerals R3 to R8 in FIG. 4) of the contact surfaces 24 and 26 of the split iron core 20 does not cause stress concentration due to the compressive force on the contact surfaces 24 and 26. In this way, each of the shapes is chamfered in an arc shape.

<3. Example of manufacturing method of rotating electrical machine>
The rotating electrical machine 1 of this embodiment is assembled as follows. Each of the divided cores 20 is disposed so as to be connected in the circumferential direction after the bobbin 6 and the winding 7 are mounted on the tooth portion 22, and corresponds to the contact surfaces 24 and 26 where the divided cores 20 on the outer peripheral surface contact each other. The stator core 5 in which the first concave portion 30 is provided is formed at the position to be. Then, the stator core 5 is fixed inside the frame 4 by press fitting or shrink fitting. Thereafter, the stator core 5 and the plurality of windings 7 and the like attached to the stator core 5 are integrated with resin to form the resin portion 35. In this way, the stator 2 is assembled.

  Next, the load side bracket 11 on which the shaft 10 is installed is fixed to the load side of the frame 4 while the shaft 10 and the rotor 3 are inserted inside the stator 2. At this time, the protruding portion 35 a of the resin portion 35 is fitted and positioned in the concave portion of the inner peripheral surface of the load side bracket 11. The anti-load side bracket 13 is fixed to the anti-load side of the frame 4 while pressing the shaft 10 into the anti-load side bearing 14. At this time, the protruding portion 35 b of the resin portion 35 is fitted and positioned in the concave portion on the inner peripheral surface of the anti-load side bracket 13. Thus, the rotating electrical machine 1 is assembled. The order in which the load side bracket 11 and the anti-load side bracket 13 are assembled may be opposite to the above.

<4. Structure and issues of comparative example of split iron core>
Before describing the effects of the present embodiment described above, an example of the structure and problem of a comparative example of a split iron core will be described.

  The stator core 5 ′ of Comparative Example 1 shown in FIG. 5 is configured by connecting a plurality of divided cores 20 ′ in the circumferential direction. The first recess 30 is not provided on the outer peripheral surface of the stator core 5 ′ at a position corresponding to the contact surfaces 24 and 26. Other configurations of the stator core 5 ′ and the split core 20 ′ are the same as those of the rotor core 5 and the split core 20 described above.

  In such a structure of Comparative Example 1, the contact area between the outer peripheral surface of the stator core 5 ′ (divided core 20 ′) and the inner peripheral surface of the frame 4 is relatively large. For this reason, when a large compressive force is applied from the frame 4 to the outer peripheral surface of the stator core 5 ′ due to shrink fitting or the like, variations in the inner diameter and thickness of the frame 4, variations in the outer diameter of the split core 20 ′, etc. As a result, non-uniform compressive stress or strain or the like occurs in the split iron core 20 ', which may lead to an increase in iron loss.

  Further, in the stator core 5 ′ of Comparative Example 1, the first recess 30 is not provided at a position corresponding to the contact surfaces 24, 26 on the outer peripheral surface, so that the outer peripheral surface of the stator core 5 ′ is the contact surface 24, 26 is also in contact with the inner peripheral surface of the frame 4 at a position corresponding to 26. For this reason, when a large compressive force acts on the contact surfaces 24 and 26 and the second protrusion 27 ′ on the outer side in the radial direction is pushed outward in the radial direction due to the tapered shape of the first protrusion 23, Since the outer peripheral surface of the second projecting portion 27 ′ is in contact with the frame 4 and the deformation to the radially outer side is suppressed, the second projecting portion 27 ′ receives a reaction force directed radially inward from the frame 4. receive. Due to this reaction force, non-uniform compressive stress and strain are generated in the vicinity of the contact surfaces 24 and 26 of the split iron core 20 ′, and the split iron core 20 is deformed to the inner side in the radial direction of the second protrusion 27 ′ on the inner side in the radial direction. A part of 'can be deformed. As a result, the cylindrical accuracy of the stator core 5 ′ may be lost, and the gap between the stator 2 and the rotor 3 may vary.

  On the other hand, in order to reduce such compressive stress and strain, as described in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2006-340509), only the outer peripheral portion of the contact surface where the split iron cores contact each other is the frame. A configuration that is press-contacted to the inner peripheral surface is considered (hereinafter referred to as “Comparative Example 2”). In the case of this comparative example 2, since a gap is formed between the divided iron core and the frame in a portion other than the contact surface, it is caused by the above-described variation in the inner diameter and thickness of the frame, variation in the outer diameter of the divided iron core, and the like. Uneven compression stress and strain can be reduced. However, since only the relatively rigid contact surface vicinity of the split iron core is supported by the frame, a part of the split iron core is deformed and fixed when a large compressive force is applied to the outer peripheral surface of the stator iron core from the frame. There is a possibility that the cylindrical accuracy of the core will be lost and the gap between the stator and the rotor may fluctuate. Further, since the contact area between the inner peripheral surface of the frame and the outer peripheral surface of the stator core is reduced, the heat conduction between the stator and the frame is reduced, and the heat dissipation is reduced.

<5. Effects of the embodiment>
According to the present embodiment, the problems of the comparative example 1 and the comparative example 2 can be solved, and the occurrence of non-uniform compressive stress, strain, and the like in the split core 20 can be suppressed. That is, in the rotating electrical machine 1 of the present embodiment, the first recess 30 is formed at a position corresponding to the contact surfaces 24 and 26 on the outer peripheral surface of the stator core 5. As a result, a gap due to the first recess 30 can be formed between the stator core 5 and the frame 4 in the vicinity of the contact surfaces 24 and 26 of the split core 20. As a result, even when a large compressive force acts on the contact surfaces 24 and 26 and portions near the contact surfaces 24 and 26 are deformed to the frame 4 side, the deformation can be allowed by the gap, and the compression on the contact surfaces 24 and 26 is performed. The force can be relaxed and the deformed portion can be prevented from receiving a reaction force from the frame 4. For this reason, since it is possible to suppress the occurrence of unequal compressive stress in the vicinity of the contact surfaces 24 and 26 of the split iron core 20, deformation of the split iron core 20 can be suppressed. As a result, there is no loss of cylindrical accuracy of the stator core 5 due to the deformation of the split core 20, and fluctuations in the gap between the stator 2 and the rotor 3 can be prevented.

  In the present embodiment, since the portion of the tooth portion 22 having relatively high rigidity in the divided iron core 20 is supported by the frame 4, even when a large compressive force acts on the outer peripheral surface of the stator iron core 5 from the frame 4, Cylindrical accuracy of the stator core 5 can be ensured, and fluctuations in the gap between the stator 2 and the rotor 3 can be prevented.

  Furthermore, since the contact area between the inner peripheral surface of the frame 4 and the outer peripheral surface of the stator core 5 can be reduced by the first recess 30 as compared with the first comparative example, the inner diameter and thickness variation of the frame 4 and the divided cores are reduced. The influence of the variation of the outer diameter of 20 can be reduced. Therefore, it is possible to suppress the generation of uneven compressive stress or strain in the split core 20.

  Moreover, since the contact area of the inner peripheral surface of the frame 4 and the outer peripheral surface of the stator core 5 can be increased as compared with the configuration in which only the outer peripheral portion of the contact surface is in contact with the frame 4 as in the comparative example 2, the fixed area The heat conduction between the child 2 and the frame 4 can be improved.

  In the present embodiment, in particular, the split iron core 20 has the first protrusion 23 on the contact surface 24 at one end in the circumferential direction, and is adjacent to the contact surface 26 at the other end in the circumferential direction. The first protrusion 23 has a second recess 25 in which the first protrusion 23 of the split core 20 is accommodated. The first protrusion 23 has a cross-sectional shape orthogonal to the axial direction and a radial width directed toward the tip of the one side. The taper shape becomes smaller. Thereby, there exists the following effect.

  That is, in the present embodiment, the plurality of divided iron cores 20 are connected in the circumferential direction in a state where each first protrusion 23 is accommodated in the second recess 25 of the adjacent divided iron core 20. When assembling the rotating electrical machine 1 having such a configuration, the plurality of divided cores 20 are arranged so as to be connected in the circumferential direction, and the first recess 30 is formed at a position corresponding to the contact surfaces 24 and 26 on the outer circumferential surface. The formed stator core 5 is formed. At this time, the concave and convex fitting between the first projecting portion 23 and the second concave portion 25 facilitates positioning of each divided iron core 20 and makes it easy to maintain the cylindrical shape of the stator iron core 5.

  Further, when the compression force is applied from the frame 4 to the outer peripheral surface of the stator core 5 by shrink fitting or the like, and the large compression force is applied to the contact surfaces 24 and 26, the taper shape of the first protrusion 23 is the second. By compressing and deforming the second protrusions 27 on both sides of the recess 25 in both radial directions, the compressive force of the contact surfaces 24 and 26 can be relaxed. Thereby, it is possible to suppress the occurrence of non-uniform compressive stress, strain, and the like in the split core 20 and to ensure the cylindrical accuracy of the stator core 5.

  In the present embodiment, in particular, the split iron core 20 has two second protrusions 27 arranged on both sides in the radial direction of the second recess 25 on the contact surface 26 at the other end in the circumferential direction. The second projecting portion 27 has a cross-sectional shape orthogonal to the axial direction such that the radial width of the tip portion is smaller than the radial width of the root portion. Thereby, there exists the following effect.

  That is, in the present embodiment, the plurality of divided iron cores 20 are accommodated in the second recesses 25 formed between the two second protrusions 27 of the adjacent divided iron cores 20 with the first protrusions 23 being adjacent to each other. Are connected in the circumferential direction. And the cross-sectional shape orthogonal to the axial direction of the 2nd projection part 27 is a shape whose radial width of a front-end | tip part is smaller than the radial width of a root part. As a result, the cross-sectional shape of the second recess 25 becomes a shape in which the opening width in the radial direction becomes smaller toward the bottom, and can be a shape that fits with the first protrusion 23 having a tapered shape.

  In the present embodiment, in particular, the first recess 30 has a predetermined circumferential direction across the outer peripheral surface of the split core 20 having the first protrusion 23 and the outer peripheral surface of the split core 20 having the second recess 25. The circumferential width La1 of the first recess 30 in the split iron core 20 having the second recess 25 is larger than the circumferential depth Lb of the second recess 25.

  Thereby, it is possible to prevent the compressive force acting on the outer peripheral surface of the stator core 5 from the frame 4 from hindering deformation (deflection) of the second protrusion 27 on the radially outer side of the second recess 25. As a result, it is possible to prevent uneven compression stress, strain, and the like from being generated in the split iron core 20 by preventing the deformation of the second projecting portion 27.

  In the present embodiment, in particular, the first recess 30 has a shape in which a corner R1 located between at least the outer peripheral surface of the stator core 5 is chamfered.

  Thereby, it can suppress that stress concentrates on the corner | angular part R1 by the side of the flame | frame 4 of the 1st recessed part 30 with the compressive force which acts on the outer peripheral surface of the stator core 5 from the flame | frame 4. Therefore, it is possible to suppress the generation of uneven compressive stress or strain in the split core 20.

<6. Modification>
The disclosed embodiments are not limited to the above, and various modifications can be made without departing from the spirit and technical idea thereof. Hereinafter, such modifications will be described.

(6-1. When the contact surface of the split iron core is flat)
In the said embodiment, the split iron core 20 has the 1st projection part 23 in the contact surface 24 of the edge part of the one side in the circumferential direction, and has the 2nd recessed part 25 in the contact surface 26 of the edge part of the other side in the circumferential direction. However, the contact surface may be a flat surface having neither a protrusion nor a recess. An example of the configuration of the contact surface portion of the split iron core in this modification is shown in FIG.

  As shown in FIG. 6, the split core 20 </ b> A of this modification has a flat contact surface 34 in the radial direction at the end portion on one side (left side in FIG. 6) in the circumferential direction, and the other side in the circumferential direction (FIG. 6 has a contact surface 36 that is flat in the radial direction and in contact with the contact surface 34. The plurality of divided iron cores 20A are connected in the circumferential direction with the contact surfaces 34 and 36 in contact with each other. A first recess 30 is formed in the stator core 5A at a position corresponding to the contact surfaces 34 and 36 on the outer peripheral surface. Other configurations of this modification are the same as those of the above embodiment.

  Also in this modified example, when the frame 4 is fixed to the outside of the stator core 5A by shrink fitting or the like, a large compressive force acts on the contact surfaces 34 and 36 between the split cores 20A, and the vicinity of the contact surfaces 34 and 36 is increased. Even when the portion is deformed toward the frame 4, the deformation can be allowed by the first recess 30, and the compressive force of the contact surfaces 34 and 36 can be reduced. Therefore, it is possible to suppress uneven compression stress from occurring in the split iron core 20A.

(6-2. When the sectional shape of the first protrusion and the second recess of the split iron core is substantially rectangular)
In the above embodiment, the split iron core 20 has the first protrusion 23 having a tapered shape whose cross-sectional shape decreases toward the tip on the contact surface 24, and the opening width in the radial direction of the cross-sectional shape on the contact surface 26 is at the tip. However, the first protrusion and the second recess may have a substantially rectangular cross-sectional shape perpendicular to the axial direction. An example of the configuration of the contact surface portion of the split iron core in this modification is shown in FIG.

  As shown in FIG. 7, the split core 20B of the present modification has a cross-sectional shape orthogonal to the axial direction directed toward one side in the circumferential direction on the contact surface 44 on one end (left side in FIG. 7) in the circumferential direction. The first protrusion 43 has a substantially rectangular shape that protrudes. Further, the split iron core 20B has a second recess 45 for accommodating the first protrusion 43 on the contact surface 46 at the other end (right side in FIG. 7) in the circumferential direction. The second recess 45 has a substantially rectangular groove shape in which a cross-sectional shape orthogonal to the axial direction is recessed toward one side in the circumferential direction. Further, the split iron core 20 </ b> B has two second protrusions 47 disposed on both sides in the radial direction of the second recess 45 on the contact surface 46. The second protrusion 47 has a substantially rectangular cross-sectional shape orthogonal to the axial direction. A first recess 30 is formed in the stator core 5B at a position corresponding to the contact surfaces 44 and 46 on the outer peripheral surface. Other configurations of this modification are the same as those of the above embodiment.

  Also in this modified example, when the frame 4 is fixed to the outside of the stator core 5B by shrink fitting or the like, a large compressive force acts on the contact surfaces 44 and 46 of the divided cores 20B, and the second protrusions on the radially outer side. Even when the portion 47 is deformed to the frame 4 side, the deformation can be allowed by the first recess 30 and the compressive force of the contact surfaces 44 and 46 can be relieved. Therefore, it is possible to suppress the occurrence of uneven compressive stress in the split iron core 20B.

  In addition, in the above description, when there are descriptions such as “vertical”, “parallel”, and “plane”, the descriptions are not strict. That is, the terms “vertical”, “parallel”, and “plane” are acceptable in design and manufacturing tolerances and errors, and mean “substantially vertical”, “substantially parallel”, and “substantially plane”. .

  In the above description, when there is a description such as “same”, “same”, “equal”, “different”, etc., in terms of external dimensions, size, shape, position, etc., the description is not strict. That is, “same”, “equal”, and “different” are acceptable in design and manufacturing tolerances and errors, and are “substantially the same”, “substantially the same”, “substantially equal”, “substantially equal”. It means “different”.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination. In addition, although not illustrated one by one, the above-mentioned embodiment and each modification are implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 4 Frame 5 Stator iron core 20 Split iron core 23 1st projection part 24 Contact surface 25 2nd recessed part 26 Contact surface 27 2nd projection part 30 1st recessed part La1 Circumferential width Lb Circumferential depth R1 Corner | angular part

Claims (7)

Frame,
A stator core fixed to the inner peripheral surface of the frame and provided with a plurality of divided cores arranged in the circumferential direction;
The split iron core is
At both ends in the circumferential direction, each has a contact surface that comes into contact with the adjacent divided core,
The stator core is
Of the outer peripheral surface, having a first recess partly provided in a region located on the radially outer side of the contact surface,
In the rotating electrical machine, the radial dimension of the stator core in the partially provided first recess is smaller than the radial dimension of the stator core in a region other than the first recess in the outer peripheral surface. ,
The split iron core is
A first protrusion on the contact surface of the end on one side in the circumferential direction;
The contact surface of the end on the other side in the circumferential direction has a second recess in which the first projection of the adjacent split core is accommodated
The first protrusion is
The cross-sectional shape orthogonal to the axial direction is a tapered shape in which the radial width decreases toward the tip on the one side,
A rotating electrical machine, wherein a gap having a predetermined dimension is provided between a tip portion of the first protrusion and a bottom portion of the second recess . Frame,
A stator core fixed to the inner peripheral surface of the frame and provided with a plurality of divided cores arranged in the circumferential direction;
The split iron core is
At both ends in the circumferential direction, each has a contact surface that comes into contact with the adjacent divided core,
The stator core is
Of the outer peripheral surface, having a first recess partly provided in a region located on the radially outer side of the contact surface,
In the rotating electrical machine, the radial dimension of the stator core in the partially provided first recess is smaller than the radial dimension of the stator core in a region other than the first recess in the outer peripheral surface. ,
The split iron core is
A first protrusion on the contact surface of the end on one side in the circumferential direction;
The contact surface of the end on the other side in the circumferential direction has a second recess in which the first protrusion of the adjacent split core is accommodated;
The first protrusion is
The cross-sectional shape orthogonal to the axial direction is a tapered shape in which the radial width decreases toward the tip on the one side,
A gap of a predetermined dimension is provided between the tip of the first protrusion and the bottom of the second recess so that the tip and the bottom face each other substantially in parallel.
Rotating electric machine characterized by that. The split iron core is
On the contact surface of the end portion on the other side in the circumferential direction, there are two second protrusions arranged on both sides in the radial direction of the second recess,
The second protrusion is
3. The rotating electrical machine according to claim 1 , wherein the cross-sectional shape orthogonal to the axial direction is a shape in which a radial width of a tip portion is smaller than a radial width of a root portion. The first recess is
It is provided to have a predetermined width in the circumferential direction across the outer peripheral surface of the split core having the first protrusion and the outer peripheral surface of the split core having the second recess,
4. The width in the circumferential direction of the first recess in the split iron core having the second recess is larger than a depth in the circumferential direction of the second recess . 5. The rotating electrical machine described. The first recess is
5. The rotating electrical machine according to claim 1, wherein at least a corner portion positioned between the stator core and the outer peripheral surface is chamfered. A stator core in which a plurality of divided cores are arranged so as to be connected in the circumferential direction, and a first recess is partially provided in a region located on the outer side in the radial direction of the contact surface where the divided cores are in contact with each other. a is the radial dimension of the stator core in the first recess provided in said part is rather smaller than the radial dimension of the stator core in the region other than the first recess of the outer peripheral surface And the said split iron core has a 1st projection part in the said contact surface of the edge part of the one side in the said circumferential direction, and the said split iron core adjacent to the said contact surface of the edge part of the other side in the said circumferential direction The first protrusion has a second recess in which the first protrusion is accommodated, and the first protrusion has a taper shape in which a cross-sectional shape perpendicular to the axial direction decreases in a radial direction toward the tip on the one side. And the tip of the first protrusion and the bottom of the second recess During, a predetermined gap is provided, and forming the stator core,
Fixing the frame to the outside of the stator core by shrink fitting;
The manufacturing method of the rotary electric machine characterized by having. A stator core in which a plurality of divided cores are arranged so as to be connected in the circumferential direction, and a first recess is partially provided in a region located on the outer side in the radial direction of the contact surface where the divided cores are in contact with each other. And the radial dimension of the stator core in the partially provided first recess is smaller than the radial dimension of the stator core in a region other than the first recess in the outer peripheral surface, And the said split iron core has a 1st projection part in the said contact surface of the edge part of the one side in the said circumferential direction, and the said contact surface of the edge part of the other side in the said circumferential direction is adjacent to the said split iron core. The first protrusion has a second recess in which the first protrusion is accommodated, and the first protrusion has a taper shape in which a cross-sectional shape orthogonal to the axial direction decreases in a radial direction toward the tip on the one side. Yes, the tip of the first protrusion and the bottom of the second recess During, and their tip and bottom substantially is opposed in parallel, a predetermined gap is provided, and forming the stator core,
Fixing the frame to the outside of the stator core by shrink fitting;
The manufacturing method of the rotary electric machine characterized by having.

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