JP4501664B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine having a structure in which a permanent magnet is mounted on a rotor and used as an electric motor or a generator.

Conventionally, a rotating electrical machine having a structure in which a permanent magnet is mounted on a rotor is known. Many rotating electric machines having such a structure are used for reasons such as low loss and high efficiency, as well as high output. Among them, the axial gap motor in which the rotor and the stator are arranged in the axial direction can be reduced in thickness, and is used when the layout of the motor is limited. For example, in an “electric power unit, electric vehicle, and electric motorcycle” (see Patent Document 1), an axial gap motor is used for driving a motorcycle.
JP 2003-2277 A

However, in the case of a conventional axial gap motor, the back core portion of the stator core on which the stator winding is mounted has a disk shape with a rotating shaft passing through the center, and its thickness is generally constant. In other words, since the longitudinal section has a rectangular shape, the size in the thickness direction is determined by magnetic saturation as it is, so that further downsizing by reducing the thickness is impossible. It was.
An object of the present invention is to provide a rotating electrical machine that can be further reduced in size as a whole.

To achieve the above object, a rotary electric machine according to the present invention, the rotor having a rotor core and a permanent magnet which is rotatably disposed about a rotary axis, wherein the stator teeth stator tooth portion Between the stator winding wound on the stator and the stator having the stator back core portion to which the stator teeth portion is mounted, and is rotatably held with an air gap , the rotor and the stator being In the axial gap type rotating electrical machine disposed opposite to the axial direction , the thickness of the stator back core portion with respect to the axial direction of the rotating shaft differs between the center side and the outer peripheral side of the rotating shaft, and the stator teeth The part has a step having the same height in the axial direction of the rotating shaft .

According to the present invention, the rotary electric machine has a thickness against the axial direction of the rotating shaft of the stator back core section stator tooth portion is attached is different between the central and outer peripheral sides of the rotary shaft, the stator teeth , by having a step of the same height in the axial direction of the rotary shaft, it is possible to increase the cross-sectional area of the stator teeth, it is possible to increase the output torque. As a result, the rotating electrical machine can be further reduced in size as a whole.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic explanatory view of an axial section of the rotating electrical machine according to the first embodiment of the present invention, and FIG. 2 is an enlarged explanatory view of the stator teeth portion of FIG. As shown in FIG. 1, the rotating electrical machine 10 includes a rotor 11, a stator 12, and a case 13. The rotor 11 includes, for example, a thick disk-shaped rotor core 14 in which steel plates are laminated, and a plurality of permanent magnets 15 embedded in the rotor core 14. The permanent magnets 15 are spaced apart at substantially equal intervals along the circumferential direction of the rotor core 14, and are arranged so that the adjacent magnetic poles are different from each other. The rotor core 14 is fixed to a rotary shaft 16 that passes through the center of the plane, and the rotary shaft 16 is rotatably held by the case 13 via a bearing 17 (see FIG. 1). The rotation of the rotor 11 is transmitted to the outside through the rotating shaft 16.

The stator 12 has a stator core 18 made of a ferromagnetic material, for example, a dust core, and a stator winding 19 wound around the stator core 18. The stator core 18 includes a perforated disk-shaped stator back core portion 20 in which a hole 20 a through which the rotating shaft 16 passes is formed, and a plurality of stator teeth portions 21 protruding from the stator back core portion 20. Become. The stator back core portion 20 is formed such that the central portion of the plane in which the hole 20a is opened has a downwardly inclined inclined surface 20b that is thicker than the outer peripheral edge and has a downwardly inclined surface 20b toward the outer peripheral edge. (See FIG. 2).
That is, the stator back core portion 20 has an annular disk shape, and the center portion of the disk surface and the outer peripheral edge portion of the disk surface have different thicknesses in the axial direction of the rotary shaft 16, and the height is increased between the central portion and the peripheral portion. Are formed in a mountain shape having a central portion at the top.

  Each stator tooth portion 21 is formed of a cube having a substantially rectangular cross section, and is substantially orthogonal to the inclined surface 20b, that is, a state inclined to the outer case 13a side with respect to a side case 13b described later (see FIG. 1). ) Are arranged at substantially equal intervals in the circumferential direction. The end surfaces of the stator teeth 21 on the side of the rotor 11 are opposed to the permanent magnets 15 of the adjacent rotors 11 and are substantially parallel to the opposed surfaces of the permanent magnets 15 at a distance from each other. As described above, the inclination of the stator back core portion 20 is the same as the inclination, the inclination direction is inclined in the opposite direction, and the diameter is increased (see FIG. 1). A stator winding 19 is wound around each stator tooth portion 21 in a direction along the inclined surface 20b via an insulator and insulating paper (not shown) (see FIG. 2).

  Further, the outer peripheral edge of the stator back core portion 20 is substantially coincident with the side surface of each stator tooth portion 21, but the center portion of the plane where the hole 20 a is opened is located inside the side surface of each stator tooth portion 21. That is, it has expanded to the position which substantially corresponds to the side surface of the stator winding | coil 19 wound by each stator teeth part 21 (refer FIG. 2). Therefore, the maximum thickness of the stator back core portion 20 remains unchanged (that is, the top portion of the enlarged portion is formed substantially parallel to the bottom surface), and the volume of the radial portion is not substantially a right triangle in the longitudinal section. It is formed substantially the same as the rectangular case, and there is no change in the magnetic saturation condition.

The case 13 includes a cylindrical outer case 13a and two side cases 13b that close both ends of the outer case 13a. The cases 13a and 13b are provided on the cases 13a and 13b, for example, are attached in a flange shape. It is fastened and fixed by bolts and nuts through the section (see FIG. 1). A rotation sensor 22 that detects the rotation of the rotating shaft 16 is mounted on the outer surface of one side case 13b.
The rotor 11 rotates about the rotating shaft 16 by a reaction force generated by the permanent magnet 15 with respect to the rotating magnetic flux applied from the stator 12. Here, an air gap (gap) exists between the rotor 11 and the stator 12 (see FIG. 1), and they do not contact each other.

  As described above, the rotating electrical machine 10 forms the stator back core portion 20 of the stator 12 in a substantially triangular shape with a radial partial vertical cross section having an outward downward inclined surface, and the upper end of the stator teeth portion 21 on the outer side. The stator winding 19 is wound around the rotating shaft (motor shaft) 15 in accordance with the stator teeth portion 21.

  Therefore, since the stator teeth portion 21 is inclined, the cross-sectional area of the stator teeth portion 21 can be increased as compared with the case where the stator teeth portion 21 is not inclined and the vertical axis is parallel to the rotation shaft 16. Output and torque can be increased. As a result, when the output and torque are the same, the stator tooth portion 21 is not inclined and the vertical axis is parallel to the rotary shaft 16, that is, compared to a conventional cylindrical shape in which the central portion and the peripheral portion of the plane are the same height. The stator 12 can be made thinner, and as a result, the entire rotating electrical machine can be further reduced in size.

  Further, the stator back core portion 20 has a substantially cylindrical shape with a trapezoidal longitudinal section in which a conical upper portion is cut in parallel with a bottom surface from a conventional cylindrical shape having a flat central portion and a peripheral portion at the same height. Thus, the volume can be reduced to about 2/3 of the cylindrical shape. Further, the stator winding 19 wound around the stator tooth portion 21 has the inner peripheral side of the stator core 18, that is, the rotating shaft 16 side closest to the rotor 11. Since the magnetic flux passes through the inner peripheral side of the stator core 18, the flow of the magnetic flux becomes the shortest, so the output and torque also increase.

(Second Embodiment)
FIG. 3 is an enlarged explanatory view of a stator tooth portion taken along an axial section of a rotating electrical machine according to the second embodiment of the present invention. As shown in FIG. 3, the stator 30 of the rotating electrical machine has a stator teeth portion 31 having a stepped peripheral surface on which the stator winding 19 is mounted, and the stator winding 19 is arranged in accordance with the shape. Winding. Other configurations and operations are the same as those of the stator 12.

  The stator teeth portion 31 has a plurality of steps whose inner and outer peripheral surfaces have substantially the same height in the height direction, that is, in the axial direction, and each of the steps is the rotation shaft 16 (the center of the stator teeth portion 31). The inner and outer peripheral surfaces of each step are formed in a stepped shape so as to be substantially parallel to the rotating shaft 16. Accordingly, the wound stator winding 19 is inclined on the inner and outer peripheral surfaces at each step portion, but is shifted toward the rotary shaft 16 at each step portion, so that the entire stator tooth portion 31 has an inner and outer periphery. The surface is substantially parallel to the rotation axis 16.

  In this way, the stator teeth portion 31 can be formed with a stepped shape on the outer peripheral surface so that the inclination of the outer peripheral surface is not a straight line but a broken line for each step portion (see the broken line in the figure) The radial length can be maximized for each step portion. Therefore, the cross-sectional area of the stator tooth portion 31 can be made wider than the case where the outer peripheral surface is a straight shape without a step, and as a result, the output of the rotating electrical machine is larger than the case where the outer peripheral surface is a straight shape without a step.・ Torque can be further increased and efficiency can be further improved. Further, the stator winding 19 can be easily wound, and the shape after the stator winding 19 has been wound becomes a substantially rectangular shape, so that the stator can be further miniaturized.

(Third embodiment)
FIG. 4 is an enlarged explanatory view of a stator tooth portion taken along an axial section of a rotating electrical machine according to the third embodiment of the present invention. As shown in FIG. 4, the stator 35 of the rotating electrical machine includes a stator winding 19 and a stator when the stator winding 19 is wound instead of the stator teeth portion 31 having a stepped peripheral surface. The peripheral surface of the insulator 36 to be mounted between the tooth portions is formed in the same step shape as that of the stator teeth portion 31. Other configurations and operations are the same as those of the stator 30.

  The insulator 36 is attached to the stator teeth portion 21 (see the first embodiment, FIG. 2) whose outer peripheral surface has a linear shape with no step, and the peripheral surface is in the height direction, that is, in the axial direction. A staircase having a plurality of steps having substantially the same height, each step being shifted toward the rotating shaft 16 (see FIG. 1), which is the center of the stator teeth portion 21, and the outer peripheral surface being substantially parallel to the rotating shaft 16. It is formed in a shape. By attaching the insulator 36 to the stator teeth portion 21, the same outer shape as the stator teeth portion 31 (see the second embodiment, FIG. 3) can be formed.

  Thus, if the insulator 36 is attached to the stator teeth portion 21 and the stator winding 19 is wound around the stator teeth portion 21 via the insulator 36, the stator teeth portion is not particularly processed. The shape after winding of the stator winding 19 can be easily made substantially rectangular, and the stator can be further miniaturized.

(Fourth embodiment)
FIG. 5 is a schematic explanatory diagram of an axial section of a rotating electrical machine according to the fourth embodiment of the present invention. As shown in FIG. 5, the rotating electrical machine 40 corresponds to the stator 42 having the stator teeth portion 41 formed in a shape corresponding to the inclined shape of the wound stator winding 19, and the stator teeth portion 41. It has the rotor 43 which formed the opposing surface in the shape to carry out. Other configurations and operations are the same as those of the rotating electrical machine 10.

  The stator teeth portion 41 has an end surface on the rotor 43 side corresponding to the inclined shape of the wound stator winding 19, and is formed by an inclined surface that is inclined downward toward the outer case 13 a side. is doing. Further, the rotor 43 is formed by an upward inclined surface toward the outer peripheral case 13a in such a manner that the surface on which the permanent magnet 15 facing the end surface of the stator teeth portion 41 is attached corresponds to the end surface of the stator teeth portion 41. ing.

  The opposing surface of the rotor 43 is formed by an upwardly inclined surface facing the outer case 13a, so that the rotor 43 has the same thickness at the center of the plane where the permanent magnet 15 is not mounted. The outer peripheral portion of the plane on which 15 is mounted is formed so as to be thicker than the central portion of the plane at a constant inclination angle, and the peripheral edge has the maximum thickness. A surface facing the end face of the stator teeth portion 41 of the permanent magnet 15 is also formed in accordance with this inclination, and the stator teeth portion 41 and the permanent magnet 15 face each other substantially in parallel with a substantially equal spacing. Is arranged (see FIG. 5).

  Thus, since the rotor 43 is formed by the inclined surface having the peripheral edge having the maximum thickness, the area of the surface facing the end surface of the stator tooth portion 41 where the permanent magnet 15 is arranged is inclined. As a result, the output and torque of the rotating electrical machine can be increased more than in the case where the rotor 43 is a flat surface.

(Fifth embodiment)
FIG. 6 is a schematic explanatory diagram of an axial section of a rotating electrical machine according to the fifth embodiment of the present invention. As shown in FIG. 6, the rotating electrical machine 45 includes a stator tooth portion 46 whose inclination direction is opposite to that of the stator teeth portion 41, and the stator teeth instead of the stator teeth portion 41 and the rotor 42. A rotor 47 corresponding to the portion 46 is provided. Other configurations and operations are the same as those of the rotating electrical machine 40.

  The stator 48 of the rotating electrical machine 45 has a stator back core portion 49 with a plurality of stator teeth portions 46 protruding therefrom, and the stator back core portion 49 is a central portion of a plane where a hole 49a is opened. The vertical section of the radius portion has an upward inclined surface 49b that is thinner than the outer peripheral edge and goes toward the outer peripheral edge, and is formed into a substantially right triangle (see FIG. 6). That is, the stator back core portion 49 is formed in a bowl-like shape in which the inclination direction is opposite to that of the stator back core portion 20 and the peripheral edge is the apex, and the inclined surface 49b is formed in the stator back core. The inclined direction is opposite to the inclined surface 20b of the portion 20. Each stator tooth portion 46 is substantially perpendicular to the inclined surface 49b, that is, spaced apart from the side case 13b toward the rotary shaft 16 (see FIG. 6) at substantially equal intervals in the circumferential direction. Has been placed.

  The rotor 47 is formed by a downwardly inclined surface toward the outer peripheral case 13 a side corresponding to the end surface of the stator teeth portion 46, the surface on which the permanent magnet 15 facing the end surface of the stator teeth portion 46 is attached. . That is, the rotor 47 is formed in a mountain shape in which the center surface of the plane through which the rotating shaft 16 penetrates protrudes toward the stator teeth portion 46, with the opposing surface of the rotor 47 being a downward inclined surface toward the outer case 13a. ing. An air gap (gap) exists between the rotor 47 and the stator 48 (see FIG. 6), and they do not contact each other.

  As described above, the rotating electrical machine 45 is formed so that each stator tooth portion 46 is inclined toward the rotation shaft 16 with respect to the side case 13b, and is opposed to the end surface of the inclined stator tooth portion 46. The opposing surface of the rotor 47 is formed by an inclined surface, and the stator winding 19 is wound around the rotating shaft 16 in an inclined manner in accordance with the stator teeth portion 46.

  Therefore, since the stator teeth portion 46 is inclined, the cross-sectional area of the stator teeth portion 46 can be increased as compared with the case where the stator teeth portion 46 is not inclined and the vertical axis is parallel to the rotation shaft 16. Output and torque can be increased. As a result, when the output and torque are the same, the stator tooth portion 46 is not inclined and the vertical axis is parallel to the rotary shaft 16, that is, compared to a conventional cylindrical shape in which the central portion of the plane and the peripheral portion are the same height. The stator 48 can be made thinner, and as a result, the entire rotating electric machine can be further reduced in size.

  Further, by making the outer peripheral side of the stator back core portion 49 whose radius section has a substantially triangular shape thick, the strength of the stator 48 can be improved. Since the thickness on the circumferential side, that is, on the rotating shaft 16 side is thicker than the peripheral edge portion, the strength of the rotor 47 can be improved and the number of rotations can be increased.

(Sixth embodiment)
FIG. 7 is an enlarged explanatory view around the stator teeth portion in the axial section of the rotating electrical machine according to the sixth embodiment of the present invention. As shown in FIG. 7, this rotating electrical machine has a stator tooth projecting substantially parallel to the rotating shaft 16 without being inclined, instead of the stator tooth portion 21 (see FIG. 1) inclined toward the outer case 13 a side. The cooling water channel 51 is provided in the side case. Other configurations and operations are the same as those of the rotating electrical machine 10.

  The stator back core portion 52 on which the stator teeth portion 50 protrudes has a plane in which the surface on which the stator teeth portion 50 is installed is substantially orthogonal to the rotating shaft 16, that is, the stator teeth portion 50 of the rotor 14. It is formed so as to be parallel to the opposing surface. That is, the stator back core part 52 has a shape in which the stator back core part 20 is reverse to the installation surface of the stator teeth part 21 and the side surface of the side case 13b. The stator back core portion 52 is attached to an annular protrusion 53 formed on the side case 13b. The protruding portion 53 has a case inclined surface 53a that protrudes toward the stator back core portion 52 and has an inclined direction opposite to the inclined surface 52a facing the side case 13b of the stator back core portion 52. The stator back core portion 52 is arranged with the inclined surface 52a placed on the inclined surface 53a.

  Therefore, the stator teeth portion 50 protruding from the stator back core portion 52 is installed substantially parallel to the rotating shaft 16 (that is, the outer peripheral case 13a) without being inclined, and the stator teeth portion 50 rotates. The end surface on the side of the child 14 is opposed to the permanent magnet 15 of the rotor core 14 that is separated and adjacent to it, and is located substantially parallel to the opposed surface of the permanent magnet 15 at a substantially equal interval. A stator winding 19 is wound around each stator tooth portion 50 substantially in parallel with an opposing surface (not shown) of the permanent magnet 15 via an insulator and insulating paper (not shown) ( (See FIG. 7).

  Further, the protrusion 53 having a substantially right-angled triangular section in the radial portion has a passage having a substantially right-angled triangular section in accordance with the outer shape thereof. It can be used as a cooling water channel 54 through which it passes.

  As described above, the stator back core portion 52 is mounted on the protruding portion 53 having a substantially right-angled triangular longitudinal section formed on the side case 13b, and the stator teeth portion having a substantially right-angled triangular longitudinal section. 50 protrudes substantially parallel to the rotary shaft 16 (see FIG. 1) without being inclined. In addition, a cooling water channel 51 is provided inside the ridge 53.

  That is, the stator back core portion 52 is formed so that the central portion of the board surface and the outer peripheral edge portion of the board surface are different in thickness in the axial direction of the rotary shaft 16, and the stator back core portion 52 is placed on the side case 13 b that houses the rotor and the stator. Cooling in which cooling water is passed inside the case inclined surface 53a while forming the case inclined surface 53a whose inclination direction is opposite to that of the inclined surface 52a of the stator back core portion 52 to which the core portion 52 is mounted. A water channel 51 was formed. Therefore, it can be easily created in the same manner as a normal rotating electrical machine (motor), and the entire rotating electrical machine can be reduced in size.

  As described in the above embodiments, the rotating electrical machine according to the present invention includes a rotor in which a magnet is mounted on a disk-shaped rotor core whose rotation axis passes through the center of the surface of the disk, and a stator teeth portion of the stator core. A rotating electric machine having a stator wound with a stator winding, the rotor and the stator being arranged in an axial direction, and the rotor being rotatably held with an air gap between the stator and the stator. The stator back core portion having an annular disk shape of the stator core is formed such that the center portion of the plate surface and the outer peripheral edge portion of the plate surface have different thicknesses in the axial direction of the rotating shaft.

  Thus, the rotating electrical machine has a stator back core portion having an annular disk shape of the stator core, with the center portion of the panel surface and the outer peripheral edge portion of the panel surface having different thicknesses in the axial direction of the rotating shaft, that is, the stator. By forming the back core part into a shape having an inclined surface, the stator tooth part formed on the stator back core part is inclined, so that the stator teeth part is crossed compared to the case where the stator teeth part is not inclined. Since the area can be increased, the output and torque can be increased. As a result, the rotating electrical machine can be further reduced in size as a whole.

  In each of the above embodiments, when the air gap surface of the stator teeth portion is substantially orthogonal to the tilt axis of the stator teeth portion and the rotor surface is inclined according to the air gap surface (see FIGS. 5 and 6). By increasing the rotor surface, it is possible to further increase the output and torque. Further, by forming the outer peripheral side of the stator back core portion thick and forming the inner peripheral side of the rotor thick accordingly (see FIG. 6), the strength of the rotor is improved and the number of rotations is increased. Is possible. Furthermore, a rotary electric machine can be easily produced by forming a stator core with a dust core.

  In the above embodiment, the rotating electric machine is described, but it may be either an electric motor (motor) or a generator, and the number of poles is not limited. Further, the stator core is not limited to the one formed by the dust core, but may be formed by an electromagnetic steel plate, amorphous, or other ferromagnetic material.

  Further, the structure is not limited to the axial gap type motor, but may be a radial gap type motor, and the number of rotors and stators is not limited to one each, for example, two rotors and a stator. One, one rotor, two stators, two rotors, two stators, etc., each of which may be one or more various combinations.

It is a schematic explanatory drawing by the axial direction cross section of the rotary electric machine which concerns on 1st Embodiment of this invention. FIG. 2 is an enlarged explanatory view of a stator teeth portion in FIG. 1. It is expansion explanatory drawing of the stator teeth part by the axial direction cross section of the rotary electric machine which concerns on 2nd Embodiment of this invention. It is expansion explanatory drawing of the stator teeth part by the axial direction cross section of the rotary electric machine which concerns on 3rd Embodiment of this invention. It is a schematic explanatory drawing by the axial cross section of the rotary electric machine which concerns on 4th Embodiment of this invention. It is a schematic explanatory drawing by the axial direction cross section of the rotary electric machine which concerns on 5th Embodiment of this invention. It is expansion explanatory drawing of the stator teeth part periphery by the axial direction cross section of the rotary electric machine which concerns on 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 40, 45 Rotating electrical machinery 11, 43, 47 Rotor 12, 30, 35, 42, 48 Stator 13 Case 13a Outer case 13b Side case 14 Rotor core 15 Permanent magnet 16 Rotating shaft 17 Bearing 18 Stator core 19 Stator winding 20a, 49a Hole 20b, 49b, 52a Inclined surface 20, 49 Stator back core part 21, 31, 41, 46, 50, 52 Stator tooth part 36 Insulator 51 Cooling channel 53 Projection part 53a Case Inclined surface

Claims (9)

Rotor, stator teeth and the stator teeth stator winding wound around said stator tooth portion having a rotor core and a permanent magnet which is rotatably disposed about an axis of rotation An axial gap type rotating electrical machine that is rotatably held with an air gap between a stator having a stator back core portion to which the rotor is mounted, and in which the rotor and the stator are disposed facing each other in the axial direction. In
The thickness of the stator back core portion with respect to the axial direction of the rotating shaft is different between the center side and the outer peripheral side of the rotating shaft, and the stator tooth portion has a step having the same height in the axial direction of the rotating shaft. A rotating electric machine characterized by   2. The rotating electrical machine according to claim 1, wherein a plurality of the stator teeth portions are provided so as to protrude from the inclined surface of the stator back core portion so as to be inclined with respect to the rotation shaft.   3. The rotating electrical machine according to claim 1, wherein the stator back core portion is formed such that the center side of the board surface is thicker than the outer peripheral edge side of the board surface.   3. The rotating electrical machine according to claim 1, wherein the stator back core portion is formed such that the outer peripheral edge side of the board surface is thicker than the central portion side of the board surface. The stator teeth portion has a center in the height direction along the circumferential direction which is the arrangement direction of the stator teeth portions and whose inner and outer peripheral surfaces are orthogonal to the stator radial direction at substantially the same height in the axial direction of the rotating shaft. 5 has a plurality of steps positioned substantially parallel to the axis of the rotating shaft, and is formed by being bent stepwise along the axial direction of the rotating shaft. Rotating electric machine. Between the stator teeth portion and the stator windings, inner and outer peripheral surfaces along the circumferential direction that is the arrangement direction of the stator teeth portion and perpendicular to the stator radial direction are substantially in the axial direction of the rotating shaft. Through an insulator having a plurality of steps having the same height and a center in the height direction substantially parallel to the axis of the rotating shaft, and being bent stepwise along the axial direction of the rotating shaft The rotary electric machine as described in any one of Claims 1-5.   The rotating electrical machine according to any one of claims 1 to 6, wherein an air gap surface of the rotor facing the stator is formed by an inclined surface that matches an inclination of the stator teeth portion.   The rotating electrical machine according to any one of claims 1 to 7, wherein the stator core is formed of a dust core. Rotor, stator teeth and the stator teeth stator winding wound around said stator tooth portion having a rotor core and a permanent magnet which is rotatably disposed about an axis of rotation An axial gap type rotating electrical machine that is rotatably held with an air gap between a stator having a stator back core portion to which the rotor is mounted, and in which the rotor and the stator are disposed facing each other in the axial direction. In
The thickness of the stator back core portion with respect to the axial direction of the rotating shaft is different between the center side and the outer peripheral side of the rotating shaft, and the stator tooth portion has a step having the same height in the axial direction of the rotating shaft. And the case where the stator and the stator are housed is placed in a state where the stator back core portion is placed, and the case inclined surface whose inclination direction is opposite to the inclined surface of the stator back core portion. A rotating electrical machine that is formed and has a cooling water passage that allows cooling water to pass inside the case inclined surface.

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