JP2008199854A - Stator core and rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core in which divided stator cores can be correctly disposed on predetermined positions while suppressing the dimension accuracy required for each of the stator cores at low and vibration etc. can be prevented on the rotor, and to provide a rotary electric machine. <P>SOLUTION: The stator core 102 is provided with an assembled stator core 13 formed by circularly disposing a plurality of divided stator cores 13A1 and 13B1; and a fixing member 11 fixable in a state where the divided stator cores 13A1, 13B1 are circularly disposed. The first divided stator core 13A1 is supported with a first contact portion P1 contacting the second divided stator core 13B1, a second contact portion P2 contacting the third divided stator core 13B2 and a third contact portion P3 contacting the fixing member 11, wherein a portion other than the first and second contact portions P1, P2 is separated from the first and second divided stator cores. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator core and a rotating electrical machine including the stator core, and more particularly to a stator core formed by a split stator core and a rotating electrical machine including the stator core.

  In recent years, various rotating electrical machines in which a stator core is formed by a plurality of divided stator cores have been proposed. The stator core of this rotating electrical machine is configured by winding a coil around each divided stator core, then arranging the divided stator core in an annular shape, and shrink fitting from the outside, so that the coil can be easily wound.

  As described above, as a rotating electrical machine in which a stator core is constituted by a plurality of divided stator cores, for example, there is a rotating electrical machine described in JP-A-8-205434.

  The rotating electrical machine described in Japanese Patent Laid-Open No. 8-205434 includes a connection recess formed on one side surface of each divided stator core and a connection protrusion formed on the other side surface. The divided stator cores are annularly connected by connecting the recesses and the connecting projections.

  Further, in the rotating electrical machine described in JP-A-8-149726 and JP-A-6-105487, as well as the rotating electrical machine described in JP-A-8-205434, one of the divided stator cores is provided. The stator core is configured by fitting the protrusion formed on the side surface and the recess formed on the other side surface.

Further, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 8-149725, notches are formed on both side surfaces of each divided stator core, and each divided stator core is annularly formed by attaching a pin to each notched portion. Are combined.
JP-A-8-205434 JP-A-8-149726 JP-A-6-105487 JP-A-8-149725

  However, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 8-205434, the divided stator cores are connected to each other by connecting recesses and connecting protrusions, and the side surfaces are substantially in contact with each other. For this reason, it is necessary to take not only the dimensional accuracy of the connecting recess and the connecting protrusion but also the dimensional accuracy of both side surfaces.

  Similarly, in the rotating electrical machines described in JP-A-8-149726, JP-A-6-105487, and JP-A-8-149725, substantially the entire side surfaces of the respective divided stator cores are also formed. Since they are in contact with each other, a high dimensional accuracy of each divided stator core is required.

  If a divided stator core having a dimensional error is assembled, the distance between the end surface of the stator teeth and the rotor varies for each divided stator core. As described above, when the positions of the stator teeth are varied, the attractive force generated in the rotor varies depending on each stator tooth, and there is a problem that vibration occurs when the rotor rotates.

  The present invention has been made in view of the above problems, and its object is to accurately dispose each divided stator core at a predetermined position while keeping the dimensional accuracy required for each divided stator core low. It is possible to provide a stator core and a rotating electrical machine that can suppress vibrations and the like from being generated in the rotor.

  A stator core according to the present invention is formed by arranging a plurality of divided stator cores in an annular shape, arranged on the circumferential surface of the assembled stator core and the assembled stator core, and pressing each divided stator core toward the radially inner side of the assembled stator core. And a fixing member that can be fixed in a state where the divided stator core is arranged in an annular shape. The split stator core is positioned on the opposite side of the first split stator core, the second split stator core adjacent to the first split stator core in the circumferential direction of the assembled stator core, and the second split stator core. And a third divided stator core. Further, the first split stator core is supported by a first contact portion that contacts the second split stator core, a second contact portion that contacts the third split stator core, and a third contact portion that contacts the fixing member. . Further, in the first side surface of the first split stator core where the first contact portion is located, a portion other than the first contact portion is separated from the surface of the second split stator core, and the first contact portion is located. Of the second side surface of the split stator core, a portion other than the second contact portion is separated from the third contact portion.

  Preferably, the said 1st contact part and the 2nd contact part are arranged on the virtual circle centering on the center of an assembly stator core.

  Preferably, the first divided stator core includes a first concave portion or a first convex portion formed on the first side surface, and a second concave portion or a second convex portion formed on the second side surface, and the second divided stator core. Includes a third convex portion formed on a third side surface facing the first side surface and entering the first concave portion or a third concave portion capable of receiving the first convex portion. And the said 3rd division | segmentation stator core is formed in the 4th side surface opposite to a 2nd side surface, and contains the 4th recessed part which receives the 4th convex part or 2nd convex part which penetrates in a 2nd recessed part. The first contact portion is a contact portion between the first convex portion and the third concave portion or a contact portion between the first concave portion and the third convex portion, and the second contact portion is the second convex portion and the fourth concave portion. Or a contact portion between the second concave portion and the fourth convex portion.

  Preferably, the surfaces of the first to fourth convex portions are curved surfaces, and the first to fourth concave portions are curved surfaces having a larger radius of curvature than the curved surfaces of the first to fourth convex portions.

  Preferably, the first contact portion is located on the radially outer side of the assembled stator core in the first side surface, and the second contact portion is located on the radially outer side of the assembled stator core in the second side surface. To do.

  Preferably, a portion other than the third contact portion of the peripheral surface of the first split stator core where the third contact portion is located is separated from the inner surface of the fixing member.

  Preferably, the split stator core protrudes radially inward of the assembled stator core and has a salient pole portion having a salient pole portion on which a coil is mounted, and is positioned radially outward from the end face of the salient pole portion. Interposing stator core.

  A rotating electrical machine according to the present invention includes the stator core.

  According to the stator core and the rotating electrical machine according to the present invention, each divided stator core can be accurately arranged at a predetermined position, while the dimensional accuracy required for each divided stator core can be kept low, and the rotor can rotate. The occurrence of harmful effects such as vibration can be suppressed.

  The motor 100 and the stator core 12 according to the present embodiment will be described with reference to FIGS. In addition, the same code | symbol may be attached | subjected to the same and corresponding structure, and the description may be abbreviate | omitted.

  FIG. 1 is a cross-sectional view schematically showing a motor mounted on a hybrid vehicle. A hybrid vehicle equipped with the motor in the figure uses an internal combustion engine such as a gasoline engine or a diesel engine and a rechargeable secondary battery (battery) as power sources.

  Referring to FIG. 1, a motor (rotating electrical machine) 100 includes a rotor (rotor) 10 and a stator 12 disposed on the outer periphery of the rotor 10. The rotor 10 includes a rotating shaft 123 that rotates about a central axis O.

  The rotor 10 includes a rotor core 110 and a permanent magnet 111 provided on the surface of the rotor core 110. In the example shown in FIG. 1, an SPM (Surface Permanent Magnet) is used, but an IPM (Interior Permanent Magnet) may be used. The rotor core 110 has a shape extending in a cylindrical shape along the central axis O. The rotor core 110 includes a plurality of electromagnetic steel plates 121 stacked in the axial direction of the central axis O.

  The stator 12 includes a stator core 102 and a coil 70 attached to the stator core 102.

  The coil 70 is electrically connected to the control device 95 by a three-phase cable 60. The three-phase cable 60 includes a U-phase cable 61, a V-phase cable 62, and a W-phase cable 63. The coil 70 includes a U-phase coil, a V-phase coil, and a W-phase coil, and a U-phase cable 61, a V-phase cable 62, and a W-phase cable 63 are connected to terminals of these three coils, respectively.

  A torque command value to be output from the motor 100 is sent to the control device 95 from an ECU (Electrical Control Unit) 80 mounted on the hybrid vehicle. The control device 95 generates a motor control current for outputting the torque specified by the torque command value, and supplies the motor control current to the coil 70 via the three-phase cable 60.

  2 is a cross-sectional view taken along line II-II in FIG. In the example shown in FIG. 2, the stator core 102 includes an assembly stator core 13 formed by annularly arranging a plurality of divided stator cores 13 </ b> A and 13 </ b> B, and a fixing member 11 disposed on the peripheral surface of the assembly stator core 13. I have. The divided stator cores 13A and the divided stator cores 13B are alternately arranged.

  The divided stator core 13 </ b> A includes a stator tooth 14 that protrudes inward in the radial direction of the assembled stator core 13, and a coil 70 is wound (mounted) on the stator tooth 14.

  The end surface 14 a of the stator tooth 14 is slightly separated from the outer peripheral surface of the rotor 10, and a gap is formed between the end surface 14 a of the stator tooth 14 and the outer peripheral surface of the rotor 10.

  FIG. 3 is an enlarged cross-sectional view of a part of FIG. As shown in FIG. 3, the divided stator core 13 </ b> A is an I-shaped divided stator core extending in the radial direction of the assembled stator core 13, and the divided stator core 13 </ b> B is a single-character divided extending in the circumferential direction of the assembled stator core 13. Is the core.

  The end face 14a located radially inward of the split stator core 13A is located radially inward from the inner peripheral face 14b of the split stator core 13B.

  For this reason, the slot which accommodates the coil 70 is prescribed | regulated by the stator teeth 14 adjacent to the circumferential direction, and the division | segmentation stator core 13B.

  A concave portion (first concave portion) 40 is formed on one side surface (first side surface) 15a of the divided stator core 13A, and a concave portion (second concave portion) 41 is also formed on the other side surface (second side surface) 15b. Has been.

  Then, a protruding portion (third convex portion) that projects toward the concave portion 40 is formed on the side surface 17a of the divided stator core (second divided stator core) 13B2 that is located on the side surface 15a side with respect to the divided stator core (first divided stator core) 13A1. ) 44 is formed.

  On the other side surface 17b of the split stator core 13B2, an overhang portion 45 is formed that projects in the direction opposite to the overhang portion 44.

  An overhanging portion 43 that protrudes toward the recess 41 is formed on the side surface 16b of the divided stator core (third divided stator core) 13B1 located on the other side surface 15b side with respect to the divided stator core 13A1. And the overhang | projection part 42 projected in the direction opposite to the overhang | projection part 43 is formed in the other side surface 16a of division | segmentation stator core 13B1.

  Here, the recessed portions 40 and 41 are curved surfaces that are recessed toward the inner side of the divided stator core 13A1. On the other hand, the projecting portions 44 and 43 are curved surfaces that project toward the concave portions 40 and 41. Here, the curvature radii of the overhang portions 44 and 43 are smaller than the curvature radii of the recesses 40 and 41. For this reason, at least a part of the overhanging portions 44 and 43 enters the recesses 40 and 41. And the overhang | projection part 44 is contacting with the surface of the recessed part 40 in the contact part P1. And in this contact part P1, the vertex part of the overhang | projection part 44 and the vertex part of the recessed part 40 are mutually contact | abutting.

  On the other hand, as the distance from the contact portion P1 increases, the surface of the recess 40 and the surface of the overhang portion 44 are separated from each other. Furthermore, a portion of the side surface 15a of the split stator core 13A1 that is adjacent to the recess 40 and a portion of the side surface 17a of the split stator core 13B2 that is adjacent to the overhanging portion 44 are separated from each other.

  The overhang portion 43 is in contact with the surface of the recess 41 at the contact portion P2. On the other hand, as the distance from the contact portion P2 increases, the surface of the recess 41 and the surface of the overhang portion 43 are separated from each other. Further, the portion of the side surface 15b of the split stator core 13A1 that is adjacent to the recess 41 and the portion of the side surface 16b of the split stator core 13B1 that is adjacent to the overhang portion 43 are separated from each other.

  The outer peripheral surface 49 located radially outward of the divided stator core 13A1 is a curved surface that projects outward in the radial direction from the end in the width direction toward the center in the width direction. .

  And the center part of the width direction of this outer peripheral surface 49 is made into the contact part (3rd contact part) P3 which contacts the inner peripheral surface of the fixing member 11. FIG. Note that the outer peripheral surface 49 and the inner peripheral surface of the fixing member 11 are separated from each other toward the end of the outer peripheral surface 49 from the contact portion P3.

  Thus, the split stator core 13A1 is supported by the split stator core 13B2 at the contact portion P1, is supported by the split stator core 13B1 at the contact portion P2, and is further fixed at the contact portion P3. 11 is supported.

  Thus, since the divided stator core 13A is supported by the three contact portions P1 to P3, the position is fixed and the displacement is suppressed.

  On the other hand, portions of the divided stator core 13A1 other than the contact portions P1 to P3 are retracted away from the surface of each member so as not to contact other members.

  The divided stator core 13A2 is located on the side opposite to the divided stator core 13A1 with respect to the divided stator core 13B2.

  Of the side surfaces 18a and 18b of the divided stator core 13A2, a concave portion 51 is formed on the side surface 18b facing the divided stator core 13B2, and a concave portion 50 is also formed on the other side surface 18a.

  And at least one part of the overhang | projection part 45 formed in the side surface 17b of division | segmentation stator core 13B2 has entered into the recessed part 51, and is contacting in the contact part P5.

  The outer peripheral surface 46 located radially outward of the divided stator core 13B2 is a curved surface that bulges outward in the radial direction from the end side toward the center in the width direction.

  And the center part of the width direction of the outer peripheral surface 46 of division | segmentation stator core 13B2 and the internal peripheral surface of the fixing member 11 are mutually contacting in the contact part P4. Note that the inner peripheral surface and the outer peripheral surface 46 of the fixing member 11 are separated from each other toward the width direction of the outer peripheral surface of the split stator core 13B2 from the contact portion P4.

  Thus, the split stator core 13B2 is also supported by the split stator core 13A1 at the contact portion P1, supported by the fixing member 11 at the contact portion P4, and supported by the split stator core 13A2 at the contact portion P5. Yes. For this reason, since the divided stator core 13B2 is also supported at three points where the three points are not arranged in the same straight line, the position is fixed and the displacement is suppressed.

  That is, each of the divided stator cores 13A and 13B is supported by the divided stator core 13A or the divided stator core 13B located on both sides in the circumferential direction of the assembled stator core 13 and supported by the fixing member 11.

  Here, the fixing member 11 is fitted into the peripheral surface of the assembled stator core 13 by shrink fitting, and presses each of the divided stator cores 13A and 13B toward the radially inner side of the assembled stator core 13.

  For this reason, for example, the divided stator core 13A1 is pressed by the divided stator core 13B2 at the contact portion P1, is pressed by the divided stator core 13B1 at the contact portion P2, and is the contact portion of the fixed member 11 at the contact portion P3. Pressed at P3, the position is fixed. The divided stator core 13B2 is also pressed by the contact portions P1, P4, and P5, and the position thereof is fixed. The contact portions P1, P2, and P5 are arranged on the virtual circle L1, and the contact portions P3 and P4 are also arranged on the virtual circle L2 with the central axis O as the center.

  Here, the virtual circle L1 is located radially outward from the radial center of the divided stator core 13A1 as described above. For this reason, as described above, the contact portions P1 and P2 are located radially outward from the central portion of the divided stator core 13A1. Here, even if dislocation or the like occurs in the split stator core 13A1 due to the pressing force applied from the contact portions P1 and P2, the magnetic flux that has entered the split stator core 13A from the stator teeth 14 of each split stator core 13A is the contact portion P1. , P2 passes through the radially inner side, flows to the adjacent divided stator core 13B, and does not pass through the regions of the contact portions P1 and P2. For this reason, it will arise in the position away from the magnetic flux path through which magnetic flux passes, and generation | occurrence | production of an iron loss can be suppressed.

  A method for manufacturing the motor 100 configured as described above will be described with reference to FIGS.

  FIG. 4 is a cross-sectional view showing a first step in the manufacturing process of the motor 100. As shown in FIG. 4, the divided stator cores 13 </ b> A are arranged on the outer surface 90 a of the columnar mold 90 at regular intervals. At this time, the end surface 14a of the divided stator core 13A is brought into contact with the outer peripheral surface 90a of the mold 90 to position each divided stator core 13A. The center of the mold 90 coincides with the central axis O shown in FIG.

  And the coil 70 made into an annular shape by an insulator or the like is attached to each divided stator core 13A from the radially outer side.

  FIG. 5 is a cross-sectional view showing a second step of the manufacturing process of the motor 100. As shown in FIG. 5, the divided stator core 13B is inserted between the divided stator cores 13A. And at least one part of the overhang | projection part formed in each division | segmentation stator core 13B enters into the recessed part formed in the side surface of the division | segmentation stator core 13A which adjoins. In this way, the divided stator cores 13A and 13B are arranged in an annular shape.

  At this time, each of the divided stator cores 13A and 13B is displaceable to some extent, but since each projecting portion of each of the divided stator cores 13B enters the recess of the divided stator core 13A, each of the divided stator cores 13A and 13B is It is easy to maintain an annular arrangement.

  FIG. 6 is a cross-sectional view showing a part of FIG. 5 in detail. In the example shown in FIG. 6, the end face 14a of the divided stator core 13A1 is separated from the outer surface 90a of the mold 90, and the divided stator cores 13A and 13B are also slightly shifted from predetermined positions.

  FIG. 7 is a cross-sectional view showing a third step of the manufacturing process of the motor 100, and FIG. 8 is an enlarged cross-sectional view of a part of FIG. As shown in FIG. 7, the annular fixing member 11 is shrink-fitted from the outer peripheral surface side of the plurality of divided stator cores 13A and 13B arranged in an annular shape.

  Then, as shown in FIG. 8, when the contact portions P1, P2, P5, and P6 where the respective divided stator cores 13A and 13B are in contact with each other are arranged along the virtual circle L1 centering on the central axis O, the respective partial stator cores The entire surface of the end surface 14 a of 13 A is in contact with the outer peripheral surface 90 a of the mold 90. Furthermore, contact portions P3 and P4 between the outer peripheral surfaces 49 and 46 of the divided stator cores 13A and 13B and the inner peripheral surface of the fixing member 11 are also arranged on the virtual circle L2.

  Here, in FIG. 6, when the fixing member 11 is shrink-fitted in a state where the divided stator cores 13 </ b> A and 13 </ b> B are slightly shifted from predetermined positions, the outer peripheral surfaces of the divided stator cores 13 </ b> A and 13 </ b> B are It is pressed by the inner peripheral surface of the fixing member 11.

  For example, when the outer peripheral surfaces 49 and 46 of the split stator cores 13A and 13B are positioned radially outward from a predetermined position, a large stress is applied from the fixing member 11, and the split stator cores 13A and 13B are Attempts to displace radially inward. Thereby, the divided stator cores 13A and 13B adjacent to the divided stator cores 13A and 13B are also displaced.

  Here, in the split stator core 13A1 and the split stator core 13B1, in the process in which the split stator cores 13A1 and 13B1 are displaced from each other with the overhanging portion 43 of the split stator core 13B1 entering the recess 41, the overhanging portion 43 and the recess 41 The surface may contact each other at a portion other than the contact portion P2.

  In this case, the stress applied to each divided stator core 13A, 13B is not balanced, and each divided stator core 13A, 13B tends to be further displaced toward a predetermined position.

  At this time, even when the overhanging portion 43 enters the recess 41 and the surface of the recess 41 and the overhanging portion 43 are in contact with each other, the surface of the recess 41 and the overhanging portion are not included in the portion other than the contact point. The side surface 15b of the split stator core 13A and the side surface 16b of the split stator core 13B1 are spaced apart from each other.

  Therefore, when the split stator cores 13A1 and 13B1 are displaced so that the contact point between the surface of the overhang portion 43 and the surface of the recess 41 becomes the contact portion P1, the side surface 15b of the split stator core 13A1 and the side surface of the split stator core 13B1 Interference with 16b is suppressed.

  For this reason, the divided stator core 13A1 and the divided stator core 13B1 can be displaced from each other, and can be displaced to predetermined positions.

  Further, the surface of the overhanging portion 43 is formed into a curved surface or a hemispherical surface, and the surface of the concave portion 41 is also a curved surface or hemispherical surface that is larger than the curved surface of the overhanging portion 43 or the curvature radius of the hemispherical surface. Therefore, the friction generated between the overhanging portion 43 and the concave portion 41 is suppressed to be small, and the overhanging portion 43 can be favorably moved along the surface of the concave portion 41. The concave portion 40 and the overhang portion 44 are formed in the same manner.

  And the contact part P2 is located in the vertex of the recessed part 41, and the vertex part of the overhang | projection part 43 contact | abuts to this contact part P2.

  Furthermore, since the outer peripheral surfaces 49 and 46 of the divided stator cores 13A1 and 13B1 are arcuate curved surfaces having a smaller radius of curvature than the inner peripheral surface of the fixing member 11, when the divided stator cores 13A and 13B rotate. The outer peripheral surfaces 49 and 46 and the inner peripheral surface of the fixing member 11 are prevented from contacting at a plurality of locations. For this reason, the rotational displacement of the split stator cores 13A and 13B is allowed.

  As described above, when the fixing member 11 is shrink-fitted from the outer peripheral side of the annularly arranged divided stator cores 13A and 13B, the divided stator cores 13A and 13B can be displaced, and are displaced toward a predetermined position. Thus, the divided stator cores 13A and 13B are arranged at predetermined positions.

  Then, as shown in FIG. 8, the divided stator cores 13A and 13B are arranged, the substantially entire surface of the end face 14a of each divided stator core 13A is in contact with the outer peripheral face 90a, and the end faces 14a can be arranged at accurate positions. .

  At this time, for example, the stress received by the divided stator core 13A from the contact portions P1, P2 of the divided stator core 13A1 can be divided into a radial component force and a circumferential component force. The resultant force in the radial direction of the stress received from the contact portions P1 and P2 is balanced with the radial stress received from the fixing member 11 from the contact portion P3. The component force in the circumferential direction of the stress received from the contact portion P1 and the component force in the circumferential direction of the stress received from the contact portion P2 are balanced.

  As described above, the divided stator core 13A1 is fixed by the stress applied from the contact portions P1, P2, and P3, and the dimensional accuracy of the contact portions P1, P2, and P3 in the divided stator core 13A1 is required. On the other hand, portions other than the contact portions P1, P2, and P3 in the divided stator core 13A1 do not come into contact with other members, so that high dimensional accuracy is not required. For this reason, the split stator core 13A can be manufactured easily while being able to reduce the manufacturing cost.

  In the split stator core 13B2, the stress received from the contact portion P1 and the contact portion P5 can be divided into a radial component force and a circumferential component force of the assembled stator core 13. The component force in the radial direction of the stress received from the contact portions P1 and P5 is balanced with the stress received from the fixing member 11 from the contact portion P4. Note that the component force in the circumferential direction of the stress received from the contact portion P1 and the component force in the circumferential direction of the stress received from the contact portion P5 are balanced.

  Even in this divided stator core 13B2, it is only necessary to ensure the accuracy of the positions of the contact portions P1, P5, and P4. In other portions, high dimensional accuracy is not required, and it can be easily manufactured, thereby reducing the cost. Can be planned.

  Then, by pulling out the mold 90 in a state where the divided stator cores 13A and 13B are arranged at predetermined positions, the position of the end face 14a of each divided stator core 13A is accurately aligned, and the assembled stator core 13 can be obtained. .

  In such an assembled stator core 13, even if the rotor 112 shown in FIG. 2 rotates, it is possible to prevent the suction force from being varied after each stator tooth, and the rotor 112 vibrates. Occurrence can be suppressed.

  In the present embodiment, an example is shown in which a recess is formed on the side surface of the I-shaped split stator core 13A, while an overhang is formed on the side surface of the single-shaped split stator core 13B. Not limited.

  For example, a concave portion is formed on one side surface of the divided stator core 13A, an overhang portion is formed on the other side surface, an overhang portion is formed on one side surface of the divided stator core 13B, and the other side surface concave portion is formed. May be. Further, the protruding portions may be formed on both side surfaces of the divided stator core 13A, and the concave portions may be formed on both side surfaces of the divided stator core 13B.

  Furthermore, as described above, the assembly stator core 13 is not limited to the case where it is formed of an I-shaped divided stator core and a single-shaped divided stator core.

  FIG. 9 is a cross-sectional view showing a first modification of the rotating electrical machine according to the present embodiment, and FIG. 10 is an enlarged cross-sectional view of a part of FIG. As shown in FIGS. 9 and 10, the assembled stator core 13 is formed by annularly arranging a plurality of divided stator cores 113. The split stator core 113 includes a main body 150 that is elongated in the circumferential direction, and a salient pole 114 that is formed on the inner circumferential surface of the main body 150 and projects radially inward. The coil 70 is wound around the salient pole portion 114.

  Of the side surfaces 113a and 113b arranged in the circumferential direction of the assembled stator core 13, the side surface 113b is formed with an overhanging portion 143 that projects in the circumferential direction, and the other side surface 113a is formed with a recess 144. .

  The surface of the overhanging portion 143 has a curved surface shape and a hemispherical shape, and the surface of the concave portion 144 has a curved surface shape and a hemispherical shape with a radius of curvature larger than that of the overhanging portion 143.

  Then, at least a part of the protruding portion 143 of the divided stator core 113 that is adjacent to the divided stator core 113 in the circumferential direction enters the concave portion 144 of the one divided stator core 113, and contacts each other at the contact portion P10. Touching. In the contact portion P10, the apex portion of the overhang portion 143 and the apex portion of the concave portion 144 are in contact with each other. And each contact part P10 of each division | segmentation stator core 113 is arranged on the virtual circle L3 centering on the central axis O. As shown in FIG. The virtual circle L3 is also located on the radially outward side from the radial center of the main body 150. For this reason, reduction of iron loss is achieved.

  A substantially entire surface of the outer peripheral surface 113 c located radially outward of each divided stator core 113 is in contact with the peripheral surface of the fixing member 11.

  For this reason, the split stator core 113 is supported by the contact portion P10 located at the apex portion of the recess 114, the contact portion P10 located at the apex of the overhang portion 143, and the outer peripheral surface 113c. The position of is fixed.

  When forming the assembled stator core 13 having such a divided stator core 113, a cylindrical mold is first arranged. Then, the plurality of divided stator cores 114 are annularly arranged so that the end surfaces 114a of the respective divided stator cores abut on the peripheral surface of the mold. At this time, at least a part of the overhanging portion 143 of each divided stator core 113 enters the recessed portion 144 of the divided stator core 113 adjacent in the circumferential direction.

  Thereafter, the fixing member 11 is shrink-fitted from the outer peripheral side of the plurality of divided stator cores 113 arranged in an annular shape. At this time, also in the examples shown in FIGS. 9 and 10, when each divided stator core 113 is displaced, contact with the adjacent divided stator core 113 at a plurality of locations is suppressed, and the displacement is possible. Yes.

  For this reason, each divided stator core 113 is displaced so that the apex portion of the overhang portion 143 contacts the concave portion 144 of the adjacent divided stator core 113.

  And in each divided stator core 113, it arranges so that each overhang | projection part 143 and the recessed part 144 may mutually contact in the contact part P10.

  At this time, in each divided stator core 113, the radial component of the pressing force applied from the fixing member 11 to the outer peripheral surface 113c and the contact portion P10 located at the apex portion of the overhang portion 143 and the apex portion of the recess 144 are positioned. The resultant force of the component force in the radial direction of the pressing force received from the contact portion P10 is balanced.

  For this reason, in each divided stator core 113, it is necessary to ensure the dimensional accuracy of the outer peripheral surface 113c, the apex of the overhanging portion 143, and the apex of the recessed portion 144, but in other portions, it does not come into contact with other members. The required dimensional accuracy can be kept low.

  Thereby, the division | segmentation stator core 113 can be manufactured easily and manufacturing cost can be reduced.

  As described above, due to shrink fitting of the fixing member 11, each divided stator core 113 is positioned at a predetermined position, and the position of the end face 114a of each divided stator core 113 is accurately arranged at a predetermined position. Thereafter, the stator can be obtained by pulling out the mold 90.

  FIG. 11 is a cross-sectional view showing a second modification of the rotating electrical machine according to the present embodiment. In the example shown in FIG. 11, each divided stator core 213 is formed in a portion located on the radially inner side of one side surface 223a, and an overhang portion 243 that projects in the circumferential direction, and the other side The side surface 223b includes an overhanging portion 244 that is formed at a portion located inward in the radial direction and extends in the circumferential direction.

  The overhang portions 244 and 243 are in contact with the overhang portions 244 and 243 of the split stator core 213 adjacent in the circumferential direction.

  On the other hand, the divided stator cores 213 adjacent to each other in the circumferential direction are not in contact at portions other than the overhang portions 243 and 244.

  In such an assembled stator core 13, the magnetic flux flowing inside flows from the divided stator core 213 to the adjacent divided stator core 213 via the overhang portions 243 and 244. Here, since each overhang | projection part 243,244 is located in radial direction inner side, a magnetic flux path | route can be shortened and the reduction | decrease of the magnetic resistance of the magnetic path | route where a magnetic flux flows can be aimed at as a result. .

  Moreover, FIG. 12 is sectional drawing which shows the 3rd modification of the rotary electric machine which concerns on this Embodiment. In the example shown in FIG. 12, the overhang portions 243 and 244 formed on the side surfaces 223a and 223b of each divided stator core 213 are located on the outer peripheral surface side of the divided stator core 213 among the side surfaces 223a and 223b.

  The positions where the projecting portions 243 and 244 of the adjacent split stator cores 213 are in contact with each other are located on the outer peripheral surface side of the split stator core 213 and are radially inward from the contact positions of the projecting portions 243 and 244. In the portion, the divided stator cores 213 are separated from each other and a gap is formed.

  Here, the protruding portions 243 and 244 of the divided stator cores 213 are pressed by the adjacent divided stator cores 243 and 244. For this reason, in each divided stator core 213, an internal stress is applied to a region that passes through the protruding portion 243 and the protruding portion 244 and extends in the circumferential direction of the assembled stator core. And in the part in the division | segmentation stator core 213 located in a radial direction inner side from the said area | region, internal stress is reduced rather than the said area | region.

  Here, the magnetic flux that has entered from the salient pole portion 214 of each divided stator core 213 circulates radially inward from the overhang portions 243 and 244 in each divided stator core 213. Then, it passes through the gap formed between the divided stator cores 213 and enters the divided stator cores 213 adjacent in the circumferential direction.

  As described above, since the magnetic flux that has entered the split stator core 213 passes through a region where the internal stress is not large, iron loss can be reduced even in the rotating electrical machine shown in FIG.

  FIG. 13 is a side view of a portion located between each of the divided stator cores 213A and 213B in FIG. As shown in FIG. 13, overhang portions 243A and 243B are formed on the side surface 223a of the split stator core 213A so as to project from the side surface 223a in the circumferential direction of the assembled stator core. The overhang portions 243A and 243B are formed at the upper end portion and the lower end portion of the side surface 223a, respectively. And the recessed part 317A is formed in the part located between overhang | projection parts 243A and 243B among the side surfaces 223a.

  Further, overhang portions 244A and 244B are also formed on the side surface 223b of the divided stator core 213B adjacent to the divided stator core 213A. The overhang portions 244A and 244B are also formed at the upper end portion and the lower end portion of the side surface 223b. And the recessed part 223b is formed in the part located between overhang | projection part 244A, 244B among the side surfaces 223b of the division | segmentation stator core 213B.

  The overhanging portion 243A of the split stator core 213A and the overhanging portion 244A of the divided stator core 213B are in contact with each other, and the overhanging portion 243B and the overhanging portion 244B are in contact with each other. On the other hand, the divided stator core 213A and the divided stator core 213B are separated from each other at portions other than the overhang portions 243A, 243B, 244A, 244B.

  For this reason, the divided stator cores 213A and 213B have no pressing force applied from the outside in the regions other than the overhang portions 243A, 243B, 244A, and 244B, and the magnetic flux can flow well, reducing iron loss. Is planned. In particular, the iron loss at the axially central portion of the assembled stator core can be satisfactorily reduced among the divided stator cores 213A and 213B.

  In the example shown in FIG. 13, the case where the present invention is applied to the rotating electric machine shown in FIG. 12 has been described, but the present invention is not limited to this. That is, the present invention can also be applied to the rotating electrical machines shown in FIGS.

  Further, in the present embodiment, the position of each divided stator core is fixed by three contact portions. However, the present invention is not limited to this, and for example, four or more contact portions are provided, The position may be fixed.

  For example, a triangular concave portion may be formed on one side surface of each divided stator core, and a curved surface-like overhanging portion may be formed on the other side surface so as to contact the surface of the concave portion at two locations.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to a stator core and a rotating electric machine including the stator core, and is particularly suitable for a stator core formed of a split stator core and a rotating electric machine including the stator core.

It is sectional drawing which represented typically the motor mounted in a hybrid vehicle. It is sectional drawing in the II-II line of FIG. FIG. 3 is a cross-sectional view in which a part of FIG. 2 is enlarged. It is sectional drawing which shows the 1st process of the manufacturing process of a rotary electric machine. It is sectional drawing which shows the 2nd process of the manufacturing process of a rotary electric machine. It is sectional drawing which shows a part of FIG. 5 in detail. It is sectional drawing which shows the 3rd process of the manufacturing process of a rotary electric machine. FIG. 8 is an enlarged cross-sectional view of a part of FIG. 7. It is sectional drawing which shows the 1st modification of the rotary electric machine which concerns on this Embodiment. It is sectional drawing to which a part of FIG. 9 was expanded. It is sectional drawing which shows the 2nd modification of the rotary electric machine which concerns on this Embodiment. It is sectional drawing which shows the 3rd modification of the rotary electric machine which concerns on this Embodiment. In FIG. 12, it is a side view in the part located between each division | segmentation stator core.

Explanation of symbols

  12 stator, 13A, 13B split stator core, 13 assembled stator core, 14 stator teeth, 42, 44, 43 overhang, 50, 51 recess, 100 motor, 102 stator core, P1, P2, P3, P4, P5 contact, L1 , L2, L3 Virtual circle.

Claims (8)

An assembly stator core formed by arranging a plurality of divided stator cores in an annular shape, and
A fixing member that is arranged on a peripheral surface of the assembled stator core, and that can be fixed in a state where the divided stator core is annularly arranged by pressing the divided stator cores inward in the radial direction of the assembled stator core;
With
The divided stator core includes a first divided stator core, a second divided stator core adjacent to the first divided stator core in the circumferential direction of the assembled stator core, and a side opposite to the second divided stator core with respect to the first divided stator core. A third divided stator core located at
The first split stator core is supported by a first contact portion that contacts the second split stator core, a second contact portion that contacts the third split stator core, and a third contact portion that contacts the fixing member,
Of the first side surface of the first split stator core where the first contact portion is located, a portion other than the first contact portion is separated from the surface of the second split stator core, and the second contact portion is located. A stator core for a rotating electrical machine in which a portion other than the second contact portion of the second side surface of the first split stator core is separated from the third contact portion.   2. The stator core for a rotating electrical machine according to claim 1, wherein the first contact portion and the second contact portion are arranged on a virtual circle centered on a center of the assembled stator core. The first split stator core includes a first concave portion or a first convex portion formed on the first side surface, and a second concave portion or a second convex portion formed on the second side surface,
The second split stator core includes a third convex portion formed on a third side surface facing the first side surface and entering the first concave portion or a third concave portion capable of receiving the first convex portion,
The third split stator core includes a fourth convex portion that is formed on a fourth side surface facing the second side surface and that enters the second concave portion or a fourth concave portion that receives the second convex portion,
The first contact portion is a contact location between the first convex portion and the third concave portion or a contact location between the first concave portion and the third convex portion,
The said 2nd contact part was made into the contact location of the said 2nd convex part and the said 4th recessed part, or the contact location of the said 2nd recessed part and the said 4th convex part, The Claim 1 or Claim 2 characterized by the above-mentioned. Stator core for rotating electrical machines.   The surface of the first to fourth convex portions is a curved surface, and the first to fourth concave portions are curved surfaces having a larger radius of curvature than the curved surfaces of the first to fourth convex portions. A stator core for a rotating electrical machine according to claim 3. The first contact portion is located on a radially outer side of the assembled stator core in the first side surface,
The stator core for a rotating electrical machine according to any one of claims 1 to 4, wherein the second contact portion is located on a radially outward side of the assembled stator core in the second side surface.   6. The part according to claim 1, wherein a portion other than the third contact portion is separated from an inner surface of the fixing member in a peripheral surface of the first divided stator core where the third contact portion is located. Stator core of rotating electrical machines.   The split stator core protrudes inward in the radial direction of the assembled stator core, and is located on the radially outer side from the end surface of the salient pole part, with an I-type split stator core having a salient pole part on which a coil is mounted. The stator core of the rotary electric machine according to any one of claims 1 to 6, comprising an intervening stator core.   A rotating electrical machine comprising the stator core according to any one of claims 1 to 7.

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