JP2014073011A - Stator for rotary electric machine and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine which positions a stator center and a case center so that the stator center and the case center are aligned with each other when a stator with low outer diameter accuracy is fixed to the case, and to provide the rotary electric machine including the stator.SOLUTION: A stator 10 for a rotary electric machine includes: a stator core 24; and a stator coil 28. The stator core 24 has an attachment part 38 which extends protruding from an outer peripheral surface to the outer diameter side and serves as an ear part. The outer peripheral surface of the attachment part 38 has a positioning surface for fixing the stator 10 for the electric rotary machine to the case 20.

Description

  The present invention relates to a rotating electrical machine stator and a rotating electrical machine, and more particularly to a rotating electrical machine stator suitable for positioning a stator center and a case center, and a rotating electrical machine including the rotating electrical machine stator.

  2. Description of the Related Art Conventionally, a rotating electrical machine is known that includes a rotor and a stator that is disposed on the outer diameter side of the rotor and generates a rotating magnetic field that rotates the rotor (see, for example, Patent Document 1). In such a rotating electrical machine, the stator has a stator core and a stator coil. As the stator core, there may be used an electromagnetic steel sheet core formed by laminating a plurality of insulating coated electromagnetic steel sheets in the axial direction. For example, in an embedded permanent magnet synchronous motor (IPM) in which a stator core is made of an electromagnetic steel sheet core, the center of the stator and the center of the case necessary for fixing the stator to the motor case are centered. Generally, this is realized by matching the outer diameter of the stator core on which the steel plates are laminated with the inner diameter of the case.

JP-A-6-351206

  However, for example, as in a hybrid excitation type rotating electrical machine, a stator includes a stator laminated core in which a plurality of electromagnetic steel plates are laminated, and a soft magnetic core for a three-dimensional magnetic path disposed on the outer diameter side of the stator laminated core, In the case of a double structure consisting of the above, it is difficult to position the center of the stator and the center of the case by the above method. This is because, unlike the laminated core, the soft magnetic core on the outer diameter side is not integrally formed in an annular shape, but is only attached to the outer diameter side by bonding or the like. This is because the accuracy of the outer diameter is reduced as compared with the structure in which is disposed.

  The present invention has been made in view of the above points, and a stator for a rotating electrical machine capable of positioning a stator center and a case center when a stator having a low outer diameter accuracy is fixed to the case, and An object is to provide a rotating electrical machine.

  The above object is a stator for a rotating electrical machine including a stator core and a stator coil, and the stator core has an ear portion that protrudes from the outer peripheral surface toward the outer diameter side, and the outer peripheral surface of the ear portion. Is achieved by a rotating electrical machine stator having an alignment surface for fixing the rotating electrical machine stator to a case.

  In addition, the above object is achieved by a rotating electrical machine that includes the rotating electrical machine stator and a case to which the rotating electrical machine stator is fixed, and in which the ear portion and the inner peripheral surface of the case are fitted.

  According to the present invention, it is possible to position the stator center and the case center when the stator having a low outer diameter accuracy is fixed to the case.

It is a perspective view showing the structure of the rotary electric machine provided with the stator for rotary electric machines which is one Example of this invention. It is sectional drawing when the rotary electric machine which is one Example of this invention is cut | disconnected by the plane containing an axial centerline. It is sectional drawing when the rotary electric machine which is one Example of this invention is cut | disconnected by III-III shown in FIG. It is sectional drawing when the rotary electric machine which is one Example of this invention is cut | disconnected by IV-IV shown in FIG. 1 is an overall perspective view and an exploded perspective view of a stator for a rotating electrical machine that is an embodiment of the present invention. It is a figure at the time of seeing the stator for rotary electric machines which is one Example of this invention from the axial direction.

  Hereinafter, specific embodiments of a stator for a rotating electrical machine and a rotating electrical machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the structure of a rotating electrical machine 12 including a rotating electrical machine stator 10 according to an embodiment of the present invention. FIG. 1 shows the rotating electrical machine 12 with a part cut. FIG. 2 shows a cross-sectional view of the rotating electrical machine 12 according to the present embodiment cut along a plane including the axial center line. FIG. 3 shows a cross-sectional view of the rotating electrical machine 12 of the present embodiment taken along the line III-III shown in FIG. FIG. 4 shows a cross-sectional view of the rotating electrical machine 12 according to the present embodiment taken along IV-IV shown in FIG. FIG. 5 shows an overall perspective view and an exploded perspective view of the stator 10 for a rotating electrical machine of the present embodiment. Moreover, FIG. 6 shows the figure at the time of seeing the stator 10 for rotary electric machines of a present Example from an axial direction.

  The rotating electrical machine 12 of the present embodiment is, for example, a so-called hybrid excitation type rotating electrical machine that rotates a rotor around an axis by a magnetic path formed in three dimensions. The rotating electrical machine 12 includes a rotor 14 that can rotate about an axis, and a rotating electrical machine stator 10 that generates a rotating magnetic field that rotates the rotor 14 (hereinafter simply referred to as the stator 10). The rotor 14 is rotatably supported by the case 20 via bearings 16 and 18 at both axial ends. The stator 10 is disposed on the outer diameter side of the rotor 14 and is fixed to the case 20. The rotor 14 and the stator 10 are opposed to each other via an air gap 22 having a predetermined length in the radial direction.

  The stator 10 has a stator core 24 and a stator coil 28. The stator core 24 is formed in a hollow cylindrical shape. A stator tooth 26 is formed on the inner peripheral surface of the stator core 24. The stator teeth 26 protrude inward in the radial direction of the stator core 24, that is, toward the axial center, and extend in the axial direction between the axial ends of the stator core 24. A plurality of stator teeth 26 (for example, 12 or 18) are provided in the circumferential direction on the inner circumferential surface of the stator core 24, and are provided at equal intervals along the circumferential direction.

  A stator coil 28 is wound around each stator tooth 26. A plurality of stator coils 28 (for example, 12 or 18) are provided in the circumferential direction on the inner circumferential surface of the stator core 24, and are provided at equal intervals along the circumferential direction. Each stator coil 28 constitutes one of a U-phase coil, a V-phase coil, and a W-phase coil when the rotating electrical machine 12 is applied to, for example, a three-phase AC motor.

  The stator core 24 is divided in the axial direction, and includes a first stator core 30, a second stator core 32, and a third stator core 34. The first to third stator cores 30 to 34 are aligned in the axial direction. The first and third stator cores 30 and 34 are disposed at both ends in the axial direction. The second stator core 32 is disposed at the center in the axial direction, and is sandwiched between the first stator core 30 and the third stator core 34 in the axial direction. The stator core 24 is divided in the axial direction into a second stator core 32 in the center in the axial direction and first and third stator cores 30 and 34 sandwiching the second stator core 32 on both sides in the axial direction.

  The first to third stator cores 30 to 34 are each formed in a hollow cylindrical shape, and have substantially the same inner diameter and the same outer diameter. The first to third stator cores 30 to 34 each have an annular back yoke portion 30a, 32a, 34a, and a stator that protrudes from the inner peripheral surface of the back yoke portion 30a, 32a, 34a toward the axial center. Teeth portions 30b, 32b, and 34b. In each of the first to third stator cores 30 to 34, the back yoke portions 30a, 32a, and 34a and the stator teeth portions 30b, 32b, and 34b are formed integrally with each other. In the second stator core 32, the back yoke portion 32a and the stator teeth portion 32b may be provided separately from each other.

  The stator teeth 30b, 32b, and 34b of the first to third stator cores 30 to 34 are provided so as to be aligned in the axial direction, and constitute the stator teeth 26 as a whole. The stator coil 28 is wound around each stator tooth 26 and is formed so as to penetrate the first to third stator cores 30 to 34 in the axial direction in slots between the stator teeth 26 aligned in the circumferential direction. .

  Each of the first and third stator cores 30 and 34 is a magnetic steel sheet core formed by laminating a plurality of insulating coated steel sheets in the axial direction. The second stator core 32 is a dust core formed of a soft magnetic material such as iron, specifically, a material obtained by compression-molding a soft magnetic powder coated with an insulating coating. The magnetic resistance in the axial direction of the second stator core 32 is smaller than the magnetic resistance in the axial direction of the first and third stator cores 30 and 34.

  The stator core 24 also has a yoke 36. The yoke 36 is a thin-walled cylindrical member provided on the outer diameter side of the first to third stator cores 30 to 34. The yoke 36 is formed so as to cover the entire outer periphery of the first to third stator cores 30 to 34, and supports the first to third stator cores 30 to 34 from the outer peripheral side. Like the second stator core 32, the yoke 36 is a dust core formed of a material obtained by compression-molding an insulating-coated soft magnetic powder. The magnetic resistance in the axial direction of the yoke 36 is smaller than the magnetic resistance in the axial direction of the first and third stator cores 30 and 34. The yoke 36 and the second stator core 32 may be formed integrally with each other. The yoke 36 is bonded and fixed to the outer peripheral surfaces of the first stator core 30 and the third stator core 34. The first stator core 30 and the third stator core 34 are magnetically coupled to each other via the yoke 36 and the second stator core 32.

  The stator core 24 has an attachment portion 38 for attaching and fixing the stator 10 to the case 20. The attachment portion 38 is an ear portion that protrudes and extends from the outer peripheral surface of the yoke 36 toward the outer diameter side. The attachment portion 38 is formed of a plurality of electromagnetic steel plates laminated in the axial direction. The attachment portion 38 includes an attachment portion 38a formed integrally with the first stator core 30, an attachment portion 38b formed integrally with the third stator core 34, and an attachment portion 38c sandwiched between both attachment portions 38a, 38b. Have.

  The attachment portion 38 c is disposed on the outer diameter side of the second stator core 32, and is configured as a block separate from the second stator core 32. Note that the attachment portion 38c may be formed integrally with the second stator core 32 instead of being formed by a plurality of electromagnetic steel plates laminated in the axial direction. The attachment portion 38 is provided at a plurality of locations (for example, three locations) in the circumferential direction with respect to the outer peripheral surface of the yoke 36. The attachment portion 38 is provided with a through hole 40 penetrating in the axial direction. The stator 10 is fixed to the case 20 by fastening bolts 42 that pass through the through holes 40 of the attachment portion 38 to the case 20.

  The rotor 14 is disposed on the inner diameter side of the stator 10. The rotor 14 has a shaft 50 and a rotor core 52. The shaft 50 extends in the axial direction, and extends from the axial end of the stator 10 at both axial ends. The shaft 50 only needs to extend from the axial end portion of the stator 10 at least on one side in the axial direction. The shaft 50 is made of a material having a predetermined iron loss, specifically, carbon steel such as S45C. The rotor core 52 has an outer diameter side rotor core 54 that is disposed on the outer diameter side of the shaft 50 and supported by the shaft 50. The outer diameter side rotor core 54 is formed in a hollow cylindrical shape, and is fixed to the outer peripheral surface of the shaft 50.

  The outer diameter side rotor core 54 is divided in the axial direction, and includes a first outer diameter side rotor core 56 and a second outer diameter side rotor core 58. The first and second outer diameter side rotor cores 56 and 58 are each formed in a hollow cylindrical shape, and are disposed on the outer diameter side of the shaft 50 and supported by the shaft 50. The first and second outer-diameter-side rotor cores 56 and 58 are each formed by laminating a plurality of insulating coated steel sheets in the axial direction. The first outer diameter side rotor core 56 and the second outer diameter side rotor core 58 are separated from each other with an annular gap 60 in the axial direction. The gap 60 is formed to have substantially the same size from the inner diameter side portion to the outer diameter side portion of the first and second outer diameter side rotor cores 56 and 58.

  The outer peripheral surface of the first outer diameter side rotor core 56 is opposed to the inner peripheral surface of the first stator core 30 in the radial direction. That is, the outer peripheral surface of the first outer diameter side rotor core 56 and the inner peripheral surface of the first stator core 30 are opposed to each other in the radial direction. Further, the outer peripheral surface of the second outer diameter side rotor core 58 faces the inner peripheral surface of the third stator core 34 in the radial direction. That is, the outer peripheral surface of the second outer diameter side rotor core 58 and the inner peripheral surface of the third stator core 34 face each other in the radial direction. The gap 60 faces the inner peripheral surface of the second stator core 32 and is provided on the inner diameter side of the second stator core 32.

  A rotor tooth 62 is formed on the outer periphery of the first outer diameter side rotor core 56. The rotor teeth 62 protrude outward in the radial direction of the first outer diameter side rotor core 56. A plurality of (for example, six) rotor teeth 62 are provided in the circumferential direction on the outer peripheral surface of the first outer diameter side rotor core 56, and are provided at equal intervals along the circumferential direction.

  Permanent magnets 64 are attached between the rotor teeth 62 adjacent to each other in the circumferential direction so as to be adjacent to the rotor teeth 62. The permanent magnet 64 is disposed on the outer diameter side of the first outer diameter side rotor core 56. The permanent magnet 64 is, for example, a ferrite magnet. A plurality of permanent magnets 64 (for example, six) are provided in the circumferential direction, and are provided at regular intervals along the circumferential direction. Each permanent magnet 64 has a predetermined width (angle) in the circumferential direction and a predetermined thickness in the radial direction. Each permanent magnet 64 is magnetized to a predetermined polarity (for example, the outer diameter side is an N pole and the inner diameter side is an S pole).

  The outer diameter side end surface of the permanent magnet 64 and the outer diameter side end surface of the rotor teeth 62 are formed at substantially the same distance from the axis center. The first outer diameter side rotor core 56 has a permanent magnet excitation magnetic pole excited by the permanent magnet 64 and a non-excitation permanent magnet non-excitation magnetic pole that is not excited by the permanent magnet 64. This permanent magnet non-excitation magnetic pole is formed in the rotor teeth 62. These permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles are alternately arranged in the circumferential direction. The first outer diameter side rotor core 56 has magnetic poles having different polarities at every predetermined angle, and has a predetermined number (for example, 12) of poles in the circumferential direction by permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles. ing.

  A rotor tooth 66 is formed on the outer periphery of the second outer diameter side rotor core 58. The rotor teeth 66 protrude outward in the radial direction of the second outer diameter side rotor core 58. A plurality of (for example, six) rotor teeth 66 are provided in the circumferential direction on the outer peripheral surface of the second outer diameter side rotor core 58, and are provided at equal intervals along the circumferential direction.

  Permanent magnets 68 are attached adjacent to the rotor teeth 66 between the rotor teeth 66 adjacent to each other in the circumferential direction. The permanent magnet 68 is disposed on the outer diameter side of the second outer diameter side rotor core 58. The permanent magnet 68 is, for example, a ferrite magnet. A plurality (for example, six) of permanent magnets 68 are provided in the circumferential direction, and are provided at regular intervals along the circumferential direction. Each permanent magnet 68 has a predetermined width (angle) in the circumferential direction and a predetermined thickness in the radial direction. Each permanent magnet 68 is magnetized to a predetermined polarity (for example, the outer diameter side is an S pole and the inner diameter side is an N pole) different from the polarity of the permanent magnet 64. That is, the permanent magnet 68 and the permanent magnet 64 have opposite polarities.

  The outer diameter side end surface of the permanent magnet 68 and the outer diameter side end surface of the rotor teeth 66 are formed at positions that are substantially the same distance from the center of the shaft. The second outer diameter side rotor core 58 has a permanent magnet excitation magnetic pole excited by the permanent magnet 68 and a non-excitation permanent magnet non-excitation magnetic pole that is not excited by the permanent magnet 68. This permanent magnet non-excitation magnetic pole is formed in the rotor tooth 66. These permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles are alternately arranged in the circumferential direction. The second outer diameter side rotor core 58 has magnetic poles having different polarities for each predetermined angle, and has the same number of poles as the first outer diameter side rotor core 56 in the circumferential direction by the permanent magnet excitation magnetic pole and the permanent magnet non-excitation magnetic pole. It has a number (for example, 12) of poles.

  The permanent magnet exciting magnetic pole of the first outer diameter side rotor core 56 and the permanent magnet non-exciting magnetic pole of the second outer diameter side rotor core 58 are arranged to face each other through the gap 60 in the axial direction. That is, the permanent magnet 64 of the first outer diameter side rotor core 56 and the rotor teeth 66 of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction. Further, the permanent magnet non-excitation magnetic pole of the first outer diameter side rotor core 56 and the permanent magnet excitation magnetic pole of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction. That is, the rotor teeth 62 of the first outer diameter side rotor core 56 and the permanent magnets 68 of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction.

  In the gap 60, that is, between the first outer diameter side rotor core 56 and the second outer diameter side rotor core 58 in the axial direction, the exciting coil 70 that excites the permanent magnet non-exciting magnetic poles of the rotor teeth 62, 66. Is arranged. The exciting coil 70 is made of an electric wire such as a copper wire and fills almost the entire area of the gap 60. The exciting coil 70 is formed in an annular shape around the shaft 50 and is toroidally wound. The exciting coil 70 is formed so that the axial thickness in each part in the radial direction is substantially uniform. The exciting coil 70 is disposed on the outer diameter side of the shaft 50 and is disposed on the inner diameter side of the second stator core 32, and faces the second stator core 32 in the radial direction.

  The exciting coil 70 is fixed to the stator 10 (specifically, the second stator core 32 of the stator core 24). The excitation coil 70 is fixed to the stator 10 using the holding member 71. The holding member 71 is a clip member made of a resin or the like formed in a U-shaped cross section or a U-shaped cross section so that the annular exciting coil 70 can be held from the inner diameter side. A plurality of holding members 71 are provided in the circumferential direction around the shaft 50. The exciting coil 70 is fixed to the stator 10 by attaching a plurality of holding members 71 to the stator 10 while holding the exciting coil 70 by contacting the radially inner end face and the axial end face of the exciting coil 70. The FIG. 5 shows a state in which the exciting coil 70 is fixed to the stator 10 by a plurality of holding members 71 provided in the circumferential direction.

  As a method for fixing the exciting coil 70 to the stator 10, the exciting coil 70 may be directly fixed to the first to third stator cores 30 to 34, for example, the first stator core 30 and the third stator core 34. The exciting coil 70 may be fixed to the stator 10 by making a hole in the axial end surface facing each other or the inner peripheral surface of the second stator core 32 and hooking the holding member 71 through the hole.

  The lead wire 77 of the exciting coil 70 passes through the stator 10, specifically, as shown in FIG. 1, so as to penetrate the slot between the stator teeth 26 of the stator core 24 of the stator 10 in the axial direction. And is connected to the controller. Lead wire 77 is insulated from stator coil 28 in the slot between stator teeth 26. A direct current is supplied to the exciting coil 70 from the controller. When a direct current is supplied to the exciting coil 70, a magnetic flux that penetrates the inner diameter side (axial center side) of the exciting coil 70 in the axial direction is generated. This amount of magnetic flux has a magnitude corresponding to the direct current supplied to the exciting coil 70.

  The shaft 50 is formed in a hollow shape. The shaft 50 includes a large diameter cylindrical portion 72 having a relatively large diameter and small diameter cylindrical portions 74 and 76 having a relatively small diameter. The small diameter cylindrical portions 74 and 76 are provided at both axial ends. The shaft 50 is supported by the case 20 via the bearings 16 and 18 in the small diameter cylindrical portions 74 and 76. The large-diameter cylindrical portion 72 is provided at the center in the axial direction, and is sandwiched between small-diameter cylindrical portions 74 and 76 at both ends in the axial direction. The first and second outer-diameter-side rotor cores 56 and 58 are disposed on the outer-diameter side of the large-diameter cylindrical portion 72 and supported by the large-diameter cylindrical portion 72, and are fixed to the outer peripheral surface of the large-diameter cylindrical portion 72. Has been.

  The rotor core 52 has an inner diameter side rotor core 80 that is disposed on the inner diameter side of the shaft 50 and supported by the shaft 50. The inner diameter side rotor core 80 is disposed on the inner diameter side of the first outer diameter side rotor core 56 and the second outer diameter side rotor core 58 of the rotor core 52 and the exciting coil 70. A hollow space 82 is formed in the large-diameter cylindrical portion 72 of the shaft 50. The inner diameter side rotor core 80 is accommodated in the hollow space 82 of the large diameter cylindrical portion 72, and is bonded and fixed to the inner peripheral surface of the large diameter cylindrical portion 72. The inner diameter side rotor core 80 is formed of a soft magnetic material, specifically, a material obtained by compression molding a soft magnetic powder coated with an insulating coating. The inner diameter side rotor core 80 is formed of a material whose iron loss is smaller than that of the shaft 50.

  The inner diameter side rotor core 80 is divided in the circumferential direction, and includes a plurality of (for example, six) rotor core pieces 84 formed in a fan shape when viewed from the axial direction. The division in the circumferential direction of the inner diameter side rotor core 80 is performed at equal intervals (equal angles) in the circumferential direction, and the respective rotor core pieces 84 have the same shape. The number of divisions in the circumferential direction of the inner diameter side rotor core 80, that is, the number of rotor core pieces 84 is the number of poles of the first and second outer diameter side rotor cores 56, 58 in the outer diameter side rotor core 54 or a divisor of the number of poles. For example, when the number of poles is “12”, the number of divisions is “2”, “3”, “4”, “6”, or “12” (in FIG. 3 and FIG. 4, the number of divisions is “6”. ”).

  The division in the circumferential direction of the inner diameter side rotor core 80 is also performed by permanent magnets 64 alternately arranged in the circumferential direction in the axial centers of the rotor 14 and the shaft 50 and the first and second outer diameter side rotor cores 56 and 58 of the rotor 14. , 68 and the rotor teeth 62, 66 (that is, the permanent magnet excitation magnetic pole and the permanent magnet non-excitation magnetic pole) are performed on a line passing through the circumferential center of each of two or more of them. That is, each plane including the dividing surface in the circumferential direction of the inner diameter side rotor core 80 passes through the axial center of the rotor 14 and the shaft 50, and any of the permanent magnets 64 and 68 and the rotor teeth 62 and 66 (that is, the permanent magnets). Passes through the center in the circumferential direction of the excitation magnetic pole and permanent magnet non-excitation magnetic pole).

  Further, the inner diameter side rotor core 80 has notch holes 86 and 88 that are vacant in the axial direction at the axial end portion. The notches 86 and 88 are provided at both ends in the axial direction. The cutout holes 86 and 88 are formed in a tapered shape or a stepped shape so that the diameter decreases from the axial end surface to the axial center. The diameters of the axial end portions (the shallowest portion) of the cutout holes 86 and 88 substantially coincide with the inner diameter of the large-diameter cylindrical portion 72 of the shaft 50, and the axial center portions (the deepest portion) of the cutout holes 86 and 88. The diameter is a predetermined diameter. The inner diameter side rotor core 80 has a predetermined thickness in the radial direction at the axially central portion, and has a thickness smaller than the thickness of the axially central portion at each axial end portion. The radial thickness of the large-diameter cylindrical portion 72 of the shaft 50 is set to a thickness that maintains the strength necessary for transmitting the motor torque, and the radial thickness at the axial central portion of the inner diameter side rotor core 80. Is set to a predetermined thickness that does not saturate the magnetic flux generated by the exciting coil 70, the radial thickness at the axially central portion of the inner diameter side rotor core 80 is the radial thickness of the large diameter cylindrical portion 72 of the shaft 50. Greater than thickness.

  The cutout hole 86 and the cutout hole 88 communicate with each other on the axial center side, and are connected through a through hole 89 that penetrates the deepest portions in the axial direction. That is, the inner diameter side rotor core 80 is formed in a hollow shape so that the through hole 89 is formed. The cutout holes 86 and 88 and the through hole 89 of the inner diameter side rotor core 80 are all provided on the axial center line of the shaft 50. The through hole 89 of the inner diameter side rotor core 80 has substantially the same diameter as that of the deepest part of the cutout holes 86 and 88.

  The rotor 14 is divided into two in the axial direction. The shaft 50 is divided into two in the axial direction, and includes two cup-shaped members 90 and 92 that are fitted to each other. The axial division position of the shaft 50 is substantially the center in the axial direction. The cup-shaped member 90 has a small-diameter cylindrical portion 74 and a part of the large-diameter cylindrical portion 72 (specifically, a half on the side connected to the small-diameter cylindrical portion 74). The cup-shaped member 92 has a small-diameter cylindrical portion 76 and a part of the large-diameter cylindrical portion 72 (specifically, a half on the side connected to the small-diameter cylindrical portion 76). The shaft 50 is formed by fitting the cup-shaped member 90 and the cup-shaped member 92 with each other. The cup-shaped member 90 supports the first outer diameter side rotor core 56, and the cup-shaped member 92 supports the second outer diameter side rotor core 58. The first outer diameter side rotor core 56 is fixed to the outer peripheral surface of the cup-shaped member 90, and the second outer diameter side rotor core 58 is fixed to the outer peripheral surface of the cup-shaped member 92.

  The cup-shaped members 90 and 92 are respectively formed with bolt holes 94 and 96 that are open in the axial direction on the center of the shaft. The bolt holes 94 and 96 have substantially the same diameter as the diameter of the through hole 89 of the inner diameter side rotor core 80. Bolts 98 are inserted into the bolt holes 94 and 96 of the cup-shaped members 90 and 92 and the through holes 89 of the inner diameter side rotor core 80. The cup-shaped member 90 and the cup-shaped member 92 are fastened by a bolt 98 while being fitted to each other.

  The inner diameter side rotor core 80 may be divided into two in the axial direction. In this case, the axially divided position of the inner diameter side rotor core 80 may correspond to the axially divided position of the shaft 50, or may be substantially the center in the axial direction. Further, one of the divided inner diameter side rotor cores 80 is bonded and fixed to the inner peripheral surface of the cup-shaped member 90 of the shaft 50, and the other divided one of the inner diameter side rotor core 80 is fixed to the inner peripheral surface of the cup-shaped member 92. What should be done.

  In the structure of the rotating electrical machine 12 described above, when an alternating current is supplied to each of the plurality of stator coils 28 provided in the circumferential direction at an appropriate timing, a magnetic flux that circulates through the inside of each stator coil 28 in the radial direction is returned. Occur. The generation of the magnetic flux is performed in accordance with the rotation of the rotor 14. When such a magnetic flux is generated, the rotor 14 receives a force in the circumferential direction, and a torque is generated that rotates the rotor 14 about its axis.

  Further, when a direct current is supplied to the annular exciting coil 70, a magnetic flux penetrating the inner diameter side (axial center side) of the exciting coil 70 in the axial direction is generated. The magnetic flux generated by the electromagnet using the exciting coil 70 is the permanent magnet non-excited magnetic pole of the first or second outer diameter side rotor cores 56, 58 → the inner diameter side rotor core 80 → the permanent of the second or first outer diameter side rotor cores 58, 56. Magnet non-excitation magnetic pole → air gap 22 → stator core 24 → air gap 22 → first or second outer diameter side rotor cores 56 and 58 are distributed along a path consisting of permanent magnet non-excitation magnetic poles. When such a magnetic flux is generated, the permanent magnet non-excitation magnetic poles of the first and second outer diameter side rotor cores 56 and 58 are excited. The magnetic flux generated by the electromagnet weakens or strengthens the magnetic flux generated by the permanent magnets 64 and 68. The amount of magnetic flux generated by the electromagnet is adjusted according to the magnitude of the direct current flowing through the exciting coil 70.

  Therefore, according to the rotating electrical machine 12 of the present embodiment, torque for rotating the rotor 14 with respect to the stator 10 can be generated by the magnetic flux generated by the electromagnet using the stator coil 28, and the magnetic flux generated by the permanent magnets 64 and 68 can be increased. The torque generated in the entire rotating electrical machine 12 can be adjusted by the combined magnetic flux with the magnetic flux generated by the electromagnet using the exciting coil 70. That is, the rotor 14 is fixed to the stator 10 by a magnetic path formed three-dimensionally by a combined magnetic flux of the magnetic flux generated by the electromagnet using the stator coil 28, the magnetic flux generated by the permanent magnets 64 and 68, and the magnetic flux generated by the electromagnet using the exciting coil 70. Can be generated, and the rotor 14 can be appropriately rotated.

  In the rotating electric machine 12 described above, the stator 10 includes a stator core 24. The stator core 24 is arranged outside the first to third stator cores 30 to 34 so as to cover the entire outer circumference of the first to third stator cores 30 to 34 divided in the axial direction and the first to third stator cores 30 to 34. And a thin-walled cylindrical yoke 36 provided on the radial side. The second stator core 32 is disposed at the center in the axial direction, and is sandwiched between the first stator core 30 and the third stator core 34 in the axial direction.

  Each of the first and third stator cores 30 and 34 described above is a magnetic steel sheet core formed by laminating a plurality of insulating steel sheets coated with insulation in the axial direction. Each of the second stator core 32 and the yoke 36 is a dust core formed of a soft magnetic material such as iron, specifically, a material obtained by compression molding a soft magnetic powder coated with an insulating coating. That is, the stator 10 is composed of a stator core 24 having a double structure in the radial direction, and is composed of different members or materials, and the first and third stator cores 30 and 34 as inner diameter side stator cores, and the outer diameter side stator core. Yoke 36.

  The stator core 24 is also formed by a plurality of electromagnetic steel plates laminated in the axial direction, and has an attachment portion having attachment portions 38a and 38b formed integrally with the first and third stator cores 30 and 34 as inner diameter side stator cores. 38. The attachment portion 38 is an ear portion that protrudes and extends from the outer peripheral surface of the yoke 36 as the outer diameter side stator core toward the outer diameter side. In other words, the first and third stator cores 30 and 34 as the inner diameter side stator core have mounting portions 38a and 38b that project and extend from the outer peripheral surface of the yoke 36 as the outer diameter side stator core toward the outer diameter side.

  The attachment portion 38 is provided at a plurality of locations (for example, three locations) in the circumferential direction with respect to the outer peripheral surface of the yoke 36. The outer peripheral surface of each mounting portion 38 has an alignment surface formed as a reference surface that serves as a reference for fixing the stator 10 to the case 20, and has an inner diameter of the stator 10, that is, at least first and third stator cores. It is formed in an arc shape that is concentric with the inner diameters of 30 and 34. The inner peripheral surface of the case 20 is provided with a recess 100 that is recessed outward in the radial direction. The bottom surface of the recess 100 is formed in an arc shape centered on the axial center of the case 20. The concave portion 100 is provided in a plurality of locations (for example, three locations) in the circumferential direction on the inner peripheral surface of the case 20 in accordance with the mounting portion 38 of the stator 10. The attachment part 38 and the recessed part 100 are each formed in the fitting shape which mutually matched.

  In the structure of the rotating electrical machine 12, the attachment portion 38 that protrudes from the outer peripheral surface of the yoke 36 toward the outer diameter side in the stator core 24 is integrated with the first and third stator cores 30 and 34 on the inner diameter side of the yoke 36. As a result, the center of the circle formed by the outer peripheral surface of the mounting portion 38 and the center of the circle formed by the inner peripheral surfaces of the first and third stator cores 30 and 34 can be easily aligned with each other. Even if the outer diameter accuracy at 36 is low, it is possible to accurately align the outer diameter side and the inner diameter side of the stator 10 itself.

  For this reason, according to the rotating electrical machine 12 of the present embodiment, when the stator 10 is fixed to the case 20, a plurality of mounting portions 38 provided in the circumferential direction are fitted into the recesses 100 on the inner peripheral surface of the case 20. The axis center of 10 and the axis center of the case 20 can be made to coincide with each other, and positioning thereof can be performed. Therefore, according to the present embodiment, the stator 10 can be attached and fixed to the case 20 in a desired positional relationship even if the outer diameter accuracy of the yoke 36 is low, so that the desired electric motor performance is exhibited as the rotating electrical machine 12. It is possible. Further, since it is possible to easily position the axis center of the stator 10 and the axis center of the case 20, the assembly of the stator 10 to the case 20 can be performed at low cost and with high accuracy.

  In the above embodiment, the first and third stator cores 30 and 34 are the “inner diameter side stator core” described in the claims, and the yoke 36 is the “outer diameter side stator core” described in the claims. The attachment portions 38 correspond to the “ear portions” recited in the claims.

  In the above embodiment, the outer peripheral surface of the mounting portion 38 of the stator core 24 is formed in an arc shape that is concentric with the inner diameters of the first and third stator cores 30, 34. If the outer peripheral surface of the mounting portion 38 has an alignment surface formed as a reference surface that serves as a reference for fixing the stator 10 to the case 20, it is not limited to an arc shape. It may be formed in a shape.

  In the above-described embodiment, a plurality of attachment portions 38 are provided in the circumferential direction. However, it is sufficient that at least two attachment portions 38 are provided. In order to accurately position the shaft center of the stator 10 and the shaft center of the case 20, it is desirable to provide three or more locations. However, in the structure in which the outer peripheral surface of the mounting portion 38 is formed in an arc shape that is concentric with the inner diameters of the first and third stator cores 30 and 34 as in this embodiment, two mounting portions 38 are provided. In this case, the yield rate of the stator 10 can be improved. It should be noted that the plurality of attachment portions 38 are preferably arranged at equal intervals in the circumferential direction.

  In the above embodiment, the rotary electric machine 12 is a hybrid excitation type rotary electric machine that rotates the rotor 14 around the axis by a magnetic path formed in three dimensions, but the present invention is not limited to this. Alternatively, the present invention may be applied to a DC field motor in which a magnetic flux generated by the flow of a direct current flows in the stator axial direction.

  Further, in the above-described embodiment, the stator 10 having the double structure including the first and third stator cores 30 and 34 and the yoke 36 each having the stator core 24 made of different members is used. An attachment portion 38 that protrudes from the outer peripheral surface 36 toward the outer diameter side is formed integrally with the first and third stator cores 30 and 34 on the inner diameter side, and the stator 10 is attached to the case as the outer peripheral surface of the attachment portion 38. However, the present invention is not limited to this, and the stator core has a single-layer structure composed of a single member. The outer peripheral surface of the mounting part protruding from the outer diameter side to the outer diameter side shall be applied to the positioning surface for fixing the stator to the case. It may be.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine stator 12 Rotating electrical machine 14 Rotor 20 Case 24 Stator core 26 Stator teeth 28 Stator coil 30 1st stator core 32 2nd stator core 34 3rd stator core 36 Yoke 38 Mounting part 40 Through hole 42 Bolt 100 Recessed part

Claims (9)

A stator for a rotating electrical machine comprising a stator core and a stator coil,
The stator core has ears extending from the outer peripheral surface toward the outer diameter side,
An outer peripheral surface of the ear portion has a positioning surface for fixing the stator for a rotating electrical machine to a case. The stator core has a double structure including an inner diameter side stator core and an outer diameter side stator core constituted by different members,
The stator for a rotating electrical machine according to claim 1, wherein the ear portion is formed on the inner diameter side stator core so as to protrude from the outer peripheral surface of the outer diameter side stator core toward the outer diameter side.   The stator for a rotating electrical machine according to claim 2, wherein the inner diameter side stator core is an electromagnetic steel sheet core formed by laminating a plurality of insulating steel sheets coated with insulation in the axial direction.   4. The stator for a rotating electrical machine according to claim 2, wherein the outer diameter side stator core is a dust core formed by compressing and molding an insulation-coded soft magnetic powder.   5. The stator for a rotating electrical machine according to claim 1, wherein an outer peripheral surface of the ear portion is formed in an arc shape that is concentric with an inner diameter of the stator.   The stator for a rotating electrical machine according to any one of claims 1 to 5, wherein the ear portion is provided at three locations with respect to the outer peripheral surface of the stator core.   6. The stator for a rotating electrical machine according to claim 5, wherein the ear portion is provided at two locations with respect to the outer peripheral surface of the stator core. A stator for a rotating electrical machine according to any one of claims 1 to 7,
A case to which the stator for a rotating electrical machine is fixed,
The rotating electrical machine, wherein the ear portion and the inner peripheral surface of the case are fitted together. The stator core has a double structure including an inner-diameter side stator core and an outer-diameter side stator core constituted by different members, and the ear portion is external to the inner-diameter side stator core from the outer peripheral surface of the outer-diameter side stator core. A DC field motor formed by projecting toward the radial side, in which magnetic flux generated by the flow of direct current flows in the stator axial direction,
9. The rotating electrical machine according to claim 8, wherein the outer diameter side stator core through which magnetic flux flowing in the stator axial direction passes is a dust core formed by compression-molding an insulation-coded soft magnetic powder.