JP2008199856A - Stator core, rotary electric machine and rotary electric machine unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core capable of ensuring motor characteristics by reducing the correlation among divided stator cores for the positional relation among the divided stator cores, having good assemblability and improved miniaturization, and to provide a rotary electric machine and a rotary electric machine unit. <P>SOLUTION: The stator core 12A is provided with an assembled stator core which has a plurality of divided stator cores 13 disposed circularly with a distance; circular members 15, 16 which are provided on an end surface positioned in the axial direction of the assembled stator core, and in which an external circumferential surface positioned outside of the radial direction matches the external circumferential surface or is positioned in the inside of radial direction of the assembled stator core; and a plurality of fixed portions provided on the inside of the radial direction of the assembled stator core from the external circumferential surface of the assembled stator core, and used for fixing each of the divided stator cores 13 to the circular members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator core, a rotating electrical machine, and a rotating electrical machine unit, and more particularly, to a stator core, a rotating electrical machine, and a rotating electrical machine unit including a plurality of divided stator cores.

  Conventionally, various rotating electrical machines have been proposed. For example, in a rotating electrical machine described in JP-A-5-95645, an inner stator core having a plurality of radially provided winding frames, and an outer peripheral surface side of the inner stator core. And an outer stator core. And the positioning protrusion by which a winding frame is fitted is formed in the internal peripheral surface of an outer side stator core. In this rotating electrical machine, the positioning of the inner stator core and the outer stator core is facilitated by fitting each winding frame between the positioning protrusions.

  However, in the rotating electrical machine described in the above-mentioned Japanese Patent Application Laid-Open No. 5-95645, the respective winding frames are close to each other, and the work of winding the coil around each winding frame is very troublesome.

  Therefore, conventionally, in order to facilitate coil winding work, the stator core is composed of a plurality of divided stator cores, and the coils can be mounted on the salient pole portions of each divided stator core, thereby facilitating the coil mounting work. Is planned.

  And as a stator core and a rotating electrical machine provided with such a divided stator core, for example, in Japanese Patent Application Laid-Open No. 2003-18780, an insulating plate in which convex portions are formed in holes formed in the divided stator core is mounted. Thus, a rotating electrical machine and a stator core that have improved winding space factor have been proposed.

  In the rotating electric machine described in Japanese Patent Application Laid-Open No. 2005-341684, in a divided stator core configured by stacking iron core sheets, a portion where adjacent divided stator cores partially overlap each other on a back yoke portion of the divided stator core. Is formed. Thereby, the clearance gap between each adjacent division | segmentation stator core is reduced.

In JP-A-2003-61319, a laminated body in which a plurality of divided stator cores are connected in the horizontal direction is formed, and this is bent into an annular shape so that each tooth is inside, and then each divided stator core is formed. There has been proposed a method of forming a stator core by welding and bonding the stator cores.
JP-A-5-95645 JP 2003-18780 A JP 2005-341684 A JP 2003-61319 A

  However, in the rotating electrical machine and the stator core proposed in Japanese Patent Application Laid-Open No. 2003-18780, each of the divided stator cores is in direct contact with each other. As a result, it is difficult to ensure the characteristics of the rotating electrical machine. In particular, when each divided stator core is displaced from a predetermined position, the inner peripheral surface of the salient pole portion of each divided stator core is displaced from the predetermined position. Thus, when each salient pole part shifts from a predetermined position, the attractive force generated between the outer peripheral surface of the rotor and the salient pole part varies by each salient pole part. This causes problems such as vibrations in the rotor.

  Furthermore, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2003-61319, each divided stator core is finally fixed by welding. Generally, the welding work is a very time-consuming work, and as a result, the assemblability of the stator core of the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2003-61319 is not good.

  In Japanese Patent Laid-Open No. 2003-18780, there is no description of fixing means for fixing each divided stator core in an annular shape to form the stator core. On the other hand, in general, when a plurality of divided stator cores are fixed in an annular shape, they are fixed by shrink fitting an annular fixing member on the outer peripheral surface side of the divided stator cores arranged in an annular shape.

  However, in such a shrink fitting method, the fixing member is attached to the outer peripheral surface side of the annularly arranged divided stator core, and the formed stator core becomes large.

  The present invention has been made in view of the problems as described above, and its purpose is to secure motor characteristics by reducing the mutual relationship of each divided stator core with respect to the positional relationship of each divided stator core, and Another object of the present invention is to provide a stator core, a rotating electrical machine, and a rotating electrical machine unit that are easy to assemble and that are reduced in size.

  A stator core according to the present invention is an assembly stator core having a plurality of divided stator cores arranged in an annular manner with an interval between them, and an outer peripheral surface located on the radially outer side provided on an end surface located in the axial direction of the assembly stator core. And an annular member positioned on the radially inner side of the assembled stator core or the outer circumferential surface of the assembled stator core. And it is provided in the diameter direction inner side of an assembly stator core from the peripheral face of the above-mentioned assembly stator core, and is provided with a plurality of fixed parts which fix each division stator core to an annular member.

  Preferably, the annular member includes a first annular member provided on an end surface located in one axial direction of the assembled stator core, and a second annular member provided on the other end surface located in the axial direction, The split stator core is fixed to the first and second annular members.

  Preferably, the fixed part is formed in an annular member and a first protrusion that protrudes toward the first hole part, and is formed in an end face positioned in the axial direction of the split stator core. And a second hole capable of receiving at least a part of the first protrusion.

  Preferably, the fixing portion is formed in the split stator core and extends in the axial direction of the split stator core; the second through hole formed in the annular member and extends in the axial direction of the split stator core; 2 and a bolt inserted into the through hole.

  A rotating electrical machine according to the present invention includes the stator core. A rotating electrical machine unit according to the present invention includes the rotating electrical machine and a housing case capable of housing the rotating electrical machine, and the fixing portion is capable of fixing the annular member and each divided stator core fixed to the annular member to the housing case. Is done.

  According to the stator core, the rotating electrical machine, and the rotating electrical machine unit according to the present invention, each divided stator core can be arranged at a predetermined position, and the inner peripheral surface of the salient pole portion of each divided stator core can be arranged at a predetermined position. And motor characteristics can be secured. Furthermore, according to the stator core, the rotating electrical machine, and the rotating electrical machine unit, it is possible to improve the assemblability and to reduce the size.

  The rotating electrical machine, the stator core, and the rotating electrical machine unit according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view schematically showing a rotating electrical machine unit 200 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.

  With reference to FIG. 1, the rotating electrical machine unit 200 includes a motor 100 and a housing case 90 that houses the motor 100. The motor (rotary electric machine) 100 includes a rotor (rotor) 10 and an annular stator 12 provided on the outer peripheral side of the rotor 10. The rotor 10 is fixed to a rotating shaft 112 provided so as to be rotatable 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 an annular stator core 12A and a coil 70 provided on the stator core 12A.

  The stator core 12 </ b> A includes annular flat plate-like fixing members 15, 16 and an assembled stator core 113 including a plurality of divided stator cores 13 arranged in an annular shape on the main surfaces of the fixing members 15, 16. Each divided stator core 13 includes a stator tooth 14 protruding in the radial direction of the fixing members 15 and 16, and a coil 70 is wound around the stator tooth 14.

  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 the line II-II in FIG. 1, and FIG. 3 is a perspective view showing an internal configuration of the rotating electrical machine unit 200, and is a perspective view in a state where each configuration is disassembled. As shown in FIG. 2, the assembled stator core 113 is formed by arranging a plurality of divided stator cores 13 in an annular shape. The split stator core 13 includes a yoke portion 17 extending in the circumferential direction of the stator core 12A, and a stator tooth 14 that protrudes inward in the radial direction of the stator core 12A from the yoke portion 17 and is wound with a coil 70. I have.

  As shown in FIGS. 2 and 3, one end face 60 </ b> A located in the axial direction of the divided stator core 13 out of the surface of each divided stator core 13 protrudes from the end face 60 </ b> A in the axial direction of each divided stator core 13. Projections (projections) 30, 31, 32, and 33 are formed. The protrusions 30, 31, 32, and 33 are provided in the vicinity of the corners of the yoke portion 17 in the end face 60A. Further, projections 34, 35, 36, and 37 projecting outward from the end surface 60B are also formed on the other end surface 60B. The protrusions 34 to 37 are also provided in the vicinity of each corner of the yoke portion 17 in the end surface 60B.

  FIG. 4 is a perspective view showing a modified example related to the protrusions 30 to 37. As shown in FIG. 4, a plurality of through holes 140 to 143 extending in the axial direction are formed in the divided stator core 13, and pins 130 to 133 are inserted (press-fitted) into the respective through holes 140 to 143. Each projecting portion may be formed by projecting both end portions of ~ 133 from both end surfaces 60A, 60B of the split stator core 13.

  2 and 3, an annular fixing member 15 is provided on the upper surface of the assembly stator core 113 formed in an annular shape, and an annular plate-like fixing member 16 is provided on the lower surface of the assembly stator core 113 as well. It has been.

  The outer peripheral surface 15B positioned on the radially outer side of the fixing member 15 is coincident with the outer peripheral surface of the assembled stator core 113 or is positioned on the radially inner side. Further, the outer peripheral surface 16B on the radially outer side of the fixing member 16 also coincides with the outer peripheral surface of the assembled stator core 113 or is positioned on the radially inner side.

  Of the surface of the fixing member 15, recesses (holes) 50, 51, 52, 53 that can receive the protrusions 30, 31, 32, 33 are formed on the main surface facing the end surface 60 </ b> A of the divided stator core 13. Is formed.

  Also in the fixing member 16, through holes (holes) 54, 55, 56, 57 that can receive the protrusions 34, 35, 36, 37 are formed on the main surface facing the end surface 60 </ b> B of the assembled stator core 113. Has been.

  The protrusions 30, 31, 32, 33 are received in the recesses 50, 51, 52, 53. The protrusions 34, 35, 36 and 37 are received in the through holes 54, 55, 56 and 57. In this way, each divided stator core 13 is fixed to the fixing members 15 and 16, and an assembled stator core 113 is formed. Thus, each divided stator core 13 can be favorably fixed by fixing each divided stator core 13 to the fixing members 15 and 16 at both end faces 60A and 60B. Since only one of the fixing members 15 and 16 can fix the position of each divided stator core 13, each divided stator core 13 may be fixed to one fixing member.

  Here, in FIG. 3, the housing case 90 is formed with a through hole 90 </ b> C capable of receiving the rotating shaft 112 shown in FIG. 1, and a pedestal portion on which the fixing member 16 </ b> B is mounted around the through hole 90 </ b> C. 90A is formed. Furthermore, a peripheral wall 90B extending in the axial direction of the stator core 12A is formed on the outer peripheral edge of the pedestal 90A. The peripheral wall 90B extends along the peripheral surface of the stator core 12A and has a cylindrical shape.

  The pedestal 90A is formed with recesses (holes) 80, 81, 82, 83 that can receive the protrusions 34, 35, 36, 37.

  Here, the protrusions 34, 35, 36, and 37 pass through the through holes 54, 55, 56, and 57 and reach the recesses 80, 81, 82, and 83. Thereby, each divided stator core 13 and the assembled stator core 113 are fixed to the housing case 90.

  Thus, the projecting portions 34, 35, 36, and 37 can fix each divided stator core 13 to the fixing member 16 and can fix each divided stator core 13 and the assembled stator core 113 to the housing case 90. There is no need to provide fixing means, and the motor 100 can be made compact.

  As described above, the divided stator cores 13 are fixed at four positions on the end faces 60A and 60B, respectively, so that their positions are not easily displaced and are arranged at predetermined positions. Each divided stator core may be directly fixed to the housing case 90. Thereby, the number of parts can be reduced.

  Here, as shown in FIG. 3, the outer peripheral surfaces 15B and 16B of the fixing members 15 and 16 coincide with the outer peripheral surface of the stator core 12A, or are positioned on the radially inner side from the outer peripheral surface of the stator core 12A. . Specifically, as shown in FIG. 2, the inner peripheral surface 15 </ b> A of the fixing member 15 is positioned on the yoke portion 17 of each divided stator core 13, and the fixing member 16 is also positioned in the same manner. For this reason, the outer diameter of the stator core 12A is not increased by the fixing members 15 and 16, and the outer diameter of the stator core 12A is kept small.

  Thus, by making the stator core 12A compact, the motor 100 itself can also be made compact.

  The protrusions 30 to 33 and 34 to 37 are formed on the end surfaces 60 </ b> A and 60 </ b> B of the divided stator cores 13 and are located radially inward from the outer peripheral surface of the assembled stator core 113.

  Here, since each divided stator core 13 is fixed individually to the fixing members 15 and 16 and the pedestal 90A, even if one of the divided stator cores 13 deviates from a predetermined size, another divided stator core The position of 13 hardly shifts. For this reason, even if the divided stator core 13 not having a predetermined dimension is mounted, there is almost no influence on the position of the other divided stator core 13. For this reason, it is easy to ensure the motor 100 characteristics. Further, as described above, since each divided stator core 13 can be arranged at a predetermined position, the end faces of the respective stator teeth 14 are also arranged at predetermined positions. For this reason, even when the rotor 10 is disposed in the stator 12 and rotates, it is possible to suppress variations in the attractive force generated between the stator teeth 14 and the rotor 10. For this reason, when the rotor 10 rotationally drives, it can suppress that the rotor 10 vibrates.

  In order to form the stator core 12 </ b> A configured as described above, first, the coil 70 is attached to the stator teeth 14 of each divided stator core 13. Then, each of the divided stator cores 13 is attached to the fixing member 15, and further, the fixing member 16 is attached to the plurality of annularly arranged divided stator cores 13 to constitute the annular stator core 12A. Thereafter, the stator core 12A is mounted on the base 90A of the housing case 90. Thus, according to motor 100 in accordance with the present embodiment, stator core 112A can be easily configured, and assembly work can be simplified.

  Further, as described above, the divided stator cores 13 are fixed by the protrusions 30 to 37 and are not configured to press each other between the divided stator cores 13. For this reason, it is suppressed that a big internal stress arises in each division | segmentation stator core 13, and reduction of an iron loss is achieved.

  Furthermore, since each divided stator core 13 is fixed by each projection 30 to 37, even if the side surfaces of each divided stator core 13 are brought into contact with each other, it is possible to suppress the divided stator cores 13 from being pressed against each other. it can. For this reason, by bringing the divided stator cores 13 into contact with each other, it is possible to reduce the magnetic resistance of the magnetic circuit through which the magnetic flux entering from the end face of each stator tooth 14 flows.

  FIG. 5 is a perspective view showing a modification of the position of the protrusion formed on the split stator core 13. As shown in FIG. 4, for example, through holes 140 and 143 are formed in the vicinity of two corners located on the radially outer side of the corners of the yoke portion 17, and the through holes 140 and 143 are formed in the through holes 140 and 143. The pins 130 and 133 may be inserted, and both ends thereof may protrude from the end faces 60A and 60B.

  Further, a through hole 145 is formed in a portion of the yoke portion 17 located radially outward from the center in the width direction of the stator teeth 14, and a pin 135 is inserted into the through hole 145. Both ends may protrude from the end faces 60A and 60B.

  Here, when the magnetism of the coil 70 wound around the stator tooth 14 of one divided stator core 13 is the S pole, the coil 70 is wound around any stator tooth 14 positioned in the circumferential direction with respect to the stator tooth 14. The magnetism of the coil 70 is N pole.

  For this reason, as shown in FIG. 5, the magnetic flux stuck from the end face of the stator teeth 14 is shunted in the circumferential direction in the yoke portion 17.

  For this reason, the through-hole 145 located in the radial direction outer side with respect to the center part in the width direction of the stator teeth 14 is located at a branch point of the magnetic flux.

  For this reason, it is suppressed by the through-hole 145 that the flow of magnetic flux is inhibited. Further, since the magnetic flux flows radially inward of the yoke portion 17, the flow of magnetic flux is obstructed by the through holes 140 and 141 located at the corners located on the radially outer side of the yoke portion 17. Is suppressed. And in each end surface 60A, 60B, by fixing at three places, each division | segmentation stator core 13 can be fixed favorably.

  FIG. 6 is a perspective view showing a modification of the motor shown in FIG. As shown in FIG. 6, each divided stator core 13 is formed with through holes 240, 241, and 242 that extend in the axial direction of the divided stator core 13.

  The fixing member 15 has through holes 240, 241, and 242 formed in portions that are positioned in the axial direction of the divided stator core 13 with respect to the through holes 240, 241, and 242. Further, the fixing member 16 is also formed with through holes 156, 155, and 156 formed in portions positioned in the axial direction of the divided stator core 13 with respect to the through holes 240, 241, and 242.

  Furthermore, holes 280, 281 and 282 are formed in portions of the pedestal portion 90A located in the axial direction of the divided stator core 13 with respect to the through holes 240, 241, and 242. Screw portions are formed on the inner peripheral surfaces of the hole portions 280, 281, and 282. Bolts 230 are inserted into the through holes 250, 240, 154 and the hole 280, and the divided stator core 13 is fixed to the fixing members 15, 16 and the housing case 90. The bolts 231 are also inserted into the through holes 251, 241, 155 and the holes 281, and the bolts 232 are inserted into the through holes 252, 242, 156 and the holes 282, and the divided stator core 13 is fixed. The members 15 and 16 and the housing case 90 are fixed.

  In such a stator core, each divided stator core 13 and the assembled stator core 113 can be easily attached to the housing case 90, and the stator core can be easily assembled.

  In the stator core 12 </ b> A according to the present embodiment, the divided stator cores 13 are in close contact with each other, but a gap may be provided between the divided stator cores 13. In the present embodiment, each split stator core is formed with a protrusion that protrudes in the axial direction of the split stator core 13 from the end faces 60A and 60B of the split stator core 13, and at least one of the protrusions is provided on each of the fixing members 15 and 16. Although the hole (recessed part) or through-hole which can receive a part is formed, it is not restricted to this. For example, a protrusion is formed on the main surface of each fixing member 15, 16 on the side where each split stator core 13 is provided, and the protrusion is received on each end face 60 </ b> A, 60 </ b> B of each split stator core 13. Possible recesses or through holes may be formed.

  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 is suitable for a stator core, a rotating electrical machine, and a rotating electrical machine unit.

It is sectional drawing which showed typically the rotary electric machine unit mounted in a hybrid vehicle. It is sectional drawing in the II-II line of FIG. It is a perspective view which shows the internal structure of a rotary electric machine unit, and is a perspective view of the state which decomposed | disassembled each structure. It is a perspective view which shows the modification regarding a projection part. It is a perspective view which shows the modification about the position of the projection part formed in the division | segmentation stator core. It is a perspective view which shows the modification of the motor shown by FIG.

Explanation of symbols

  30 to 37 Protrusions, 130 to 133 pins, 10 rotor, 12 stator, 12A stator core, 13 split stator core, 14 stator teeth, 15A inner peripheral surface, 15, 16 fixing member, 15B, 16B outer peripheral surface, 30, 31, 32 , 33, 34, 35, 36, 37 Protruding part, 50, 51, 52, 53 Recessed part, 54, 55, 56, 57 Through hole, 60A, 60B End face, 60-phase cable, 70 Coil, 80, 81, 82, 83 recess, 100 motor (rotary electric machine), 110 rotor core, 113 assembled stator core, 200 rotary electric machine unit.

Claims (6)

An assembled stator core having a plurality of split stator cores arranged annularly at intervals;
An annular annular ring is provided on an end surface located in the axial direction of the assembled stator core, and an outer circumferential surface located on the radially outer side coincides with an outer circumferential surface of the assembled stator core or is located on a radially inner side of the assembled stator core. Members,
A plurality of fixing portions provided on the radially inner side of the assembly stator core from the outer peripheral surface of the assembly stator core, and fixing each of the divided stator cores to the annular member;
Stator core with The annular member includes a first annular member provided on an end face located in one axial direction of the assembly stator core, and a second annular member provided on the other end face located in the axial direction,
The stator core according to claim 1, wherein each of the divided stator cores is fixed to the first and second annular members.   The fixed portion includes a first hole or a first protrusion formed on an end surface positioned in the axial direction of the split stator core, and a first protrusion formed in the annular member and protruding toward the first hole. The stator core according to claim 1, further comprising: a second hole portion that can receive at least a part of the first protrusion portion or the first protrusion portion.   The fixed portion is formed in the split stator core and extends in the axial direction of the split stator core, the second through hole is formed in the annular member and extends in the axial direction of the split stator core, and the first The stator core according to claim 1, further comprising: a bolt inserted into the second through hole.   A rotating electrical machine comprising the stator core according to claim 1. The rotating electrical machine according to claim 5;
A housing case capable of housing the rotating electrical machine,
The fixing unit is a rotating electrical machine unit in which the annular member and the divided stator cores fixed to the annular member can be fixed to the housing case.

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