Rotary electric machine

Abstract

To efficiently cool a coil installed in a rotary electric machine.SOLUTION: A rotary electric machine comprises: a cylindrical stator; a rotor arranged inside the stator and formed by laminating plate-like members in a rotation axis direction; and a shaft engaged into the rotor and supporting the rotor in such a manner that the rotor is rotatable around the rotation axis. The rotor comprises an intra-rotor conduit that is formed by laminating the plurality of plate-like members each having at least one conduit-forming hole formed thereon in a state where parts of openings of the conduit-forming holes are overlapped with each other in the rotation axis direction and that has an exit communicating with a space between the stator and the rotor. The shaft comprises an intra-shaft conduit communicating with an exit of an intra-housing conduit that is formed in the housing of a motor and an entrance of the intra-rotor conduit.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] Rotating electric machines such as motors and generators sometimes have difficulty operating efficiently due to heat generated by their coils during operation. For this reason, technologies for cooling the coils mounted in rotating electric machines have been developed. One example of such technology is the cooling device disclosed in Patent Document 1. This cooling device is provided with a cooling oil pipe that is disposed along the rotational axis above the vertically highest points of the stator core and coil ends, and that discharges cooling oil from a discharge hole to an oil application point on the outer circumferential surface of the coil end. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-115651 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the cooling device described above cools the portion of the coil where the cooling oil does not pass only by heat conduction from that portion to the portion where the cooling oil does pass. As a result, the cooling device described above may not be able to cool the coil efficiently. Furthermore, the cooling device described above may not be able to cool the coil uniformly because the temperature of the cooling oil increases as it flows downward.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotating electric machine that can efficiently cool the coils mounted therein. [Means for solving the problem]

[0006] In order to achieve the above object, a rotating electric machine of the present invention includes a cylindrical stator, a rotor disposed inside the stator and formed by stacking plate-like members in the direction of a rotation axis, and a shaft fitted into the rotor and supporting the rotor so that the rotor can rotate about the rotation axis. The rotor is formed by stacking a plurality of the plate-like members, each having at least one conduit-forming hole, such that openings of the conduit-forming holes partially overlap in the direction of the rotation axis, and includes an internal-rotor conduit whose outlet leads to a space between the stator and the rotor. The shaft has an internal-shaft conduit that leads to an outlet of an internal-casing conduit formed in a motor housing and to an inlet of the internal-rotor conduit.

[0007] At least one of the conduit-forming holes may be a depression formed in the surface of the plate-like member or a through-hole that penetrates the plate-like member.

[0008] The rotor internal conduit may have an outlet formed within a predetermined distance from a plane perpendicular to the rotation axis of the rotor and passing through the center of the rotor in the direction of the rotation axis, and a coil attached to the stator.

[0009] The rotor internal conduit may have an outlet formed within a predetermined distance from a portion of the coil attached to the stator whose temperature is equal to or higher than a predetermined temperature.

[0010] The rotor internal conduit may be formed by stacking two types of plate-like members having conduit-forming holes formed at different positions.

[0011] The rotor internal conduit may be formed along a straight line perpendicular to the rotation axis of the rotor.

[0012] At least one of the conduit forming holes may be formed between two adjacent poles in the rotor. [Effects of the Invention]

[0013] According to the present invention, it is possible to efficiently cool a coil mounted on a rotating electrical machine. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view taken along a plane passing through a rotation axis of a motor according to an embodiment. [Figure 2] 1 is a cross-sectional view taken along a plane perpendicular to a rotation axis of a motor according to an embodiment. [Figure 3] FIG. 2 is a perspective view showing a shaft internal conduit and a rotor internal conduit according to the embodiment. [Figure 4] 10A and 10B are views showing a plate-shaped member having holes formed therein that form rotor internal conduits according to an embodiment; [Figure 5] 10A and 10B are views showing a plate-shaped member having holes formed therein that form rotor internal conduits according to an embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view taken along a plane passing through the rotation axis of a motor according to an embodiment. Fig. 2 is a cross-sectional view taken along a plane perpendicular to the rotation axis of a motor according to an embodiment.

[0016] The motor 1 is mounted on, for example, an electric vehicle to rotate the wheels of the electric vehicle. The motor 1 is an example of a rotating electric machine. As shown in FIGS. 1 and 2, the motor 1 includes a housing 20, a housing 30, a housing forming member 40, a housing forming member 50, a shaft 60, a rotor 70, and a stator 80. In the following description, an X-axis that is parallel to the rotation axes of the shaft 60 and the rotor 70, a Y-axis perpendicular to the X-axis, and a Z-axis perpendicular to the X-axis and Y-axis are used. The X-axis, Y-axis, and Z-axis form a right-handed system.

[0017] Housing 20 is a cylindrical member that houses shaft 60, rotor 70, stator 80, etc. Housing 20 also has conduit 21, filter 22, and conduit 23 attached thereto, and internal conduit 20P is formed therein. Conduit 21 is a tube into which refrigerant flows to cool each part of motor 1 by flowing through each part of motor 1, and is attached to housing 20 along the Z direction. Internal conduit 20P is a cylindrical tube into which refrigerant flows from conduit 21. Filter 22 prevents foreign matter contained in refrigerant that has flowed down to the -Z direction side of housing 20 or housing 30 from entering conduit 23. Conduit 23 is a cylindrical tube into which refrigerant that has flowed down to the -Z direction side of housing 20 or housing 30 flows.

[0018] The housing 30 is a cylindrical member attached to the end of the housing 20 on the -X direction side. An internal housing conduit 30P is formed inside the housing 30. The internal housing conduit 30P is a cylindrical tube into which the refrigerant flows from the internal housing conduit 20P. The housing 30 also has a hole into which the end of the shaft 60 on the -X direction side is inserted and a hole into which a bearing 64 (described later) is inserted.

[0019] Housing forming member 40 is a disk-shaped member that covers the opening on the +X direction side of housing 20. Housing forming member 40 also has formed therein a hole into which the end of shaft 60 on the +X direction side is inserted, a hole in which bearing 61 is attached, a hole in which bearing 62 is attached, and a hole in which bearing 63 is attached.

[0020] The housing forming member 50 is a plate-like member that covers the opening on the −X direction side of the housing 30. The housing forming member 50 also has an internal housing conduit 50P formed therein. The internal housing conduit 50P is a cylindrical tube into which the refrigerant flows from the internal housing conduit 30P.

[0021] Shaft 60 is a rod-shaped member that is fitted into rotor 70 and supports rotor 70 in a manner that allows rotor 70 to rotate about the rotation axis. The end of shaft 60 on the +X direction side is inserted into a hole formed in housing 40 and is rotatably supported by bearings 61, 62, and 63 attached to housing 40. The end of shaft 60 on the -X direction side is inserted into a hole formed in housing 30 and is rotatably supported by bearing 64 attached to housing 30.

[0022] FIG. 3 is a perspective view showing an internal-shaft conduit according to an embodiment. The shaft 60 is formed with an internal-shaft conduit 60P. As shown in FIG. 1, the internal-shaft conduit 60P includes a conduit 601P, a conduit 602P, and a conduit 603P. As shown in FIG. 1, the conduit 601P is a cylindrical tube into which the refrigerant flows from the internal-casing conduit 50P and is connected to the outlet of the internal-casing conduit 50P. As shown in FIGS. 1 to 3, the conduit 602P is a cylindrical tube into which the refrigerant flows from the conduit 601P and has a larger cross-sectional area taken along a plane parallel to the YZ plane than the conduit 601P. As shown in FIGS. 1 to 3, the conduit 603P is a cylindrical tube into which the refrigerant flows from the conduit 602P and is connected to the inlet of the internal-rotor conduit 70P described below.

[0023] The rotor 70 is a member that rotates due to the magnetic force generated by the stator 80, and is disposed inside the stator 80. The rotor 70 is made by laminating multiple annular plate-shaped members in the direction of the rotation axis. These plate-shaped members are made of electromagnetic steel sheets. Each of these plate-shaped members has a hole in the center into which the shaft 60 is inserted, and holes into which permanent magnets are inserted are regularly arranged along the circumferential direction.

[0024] FIG. 3 is a perspective view showing an internal-rotor conduit according to an embodiment. The rotor 70 is equipped with an internal-rotor conduit 70P. The internal-rotor conduit 70P is a pipe into which the refrigerant flows from the conduit 603P. The inlet of the internal-rotor conduit 70P is connected to the outlet of the conduit 603, and the outlet is connected to the space between the stator 80 and the rotor 70. The internal-rotor conduit 70P is formed by stacking plate-like members each having at least one hole formed therein such that the openings of the hole overlap in a direction parallel to the rotational axis of the rotor 70. Specifically, the internal-rotor conduit 70P is formed by stacking two types of plate-like members each having a hole formed at different positions.

[0025] 4 is a diagram showing a plate-shaped member having holes formed therein for forming the rotor internal conduits according to the embodiment. As shown in FIG. 4, plate-shaped member 71 has permanent magnet insertion holes 701, permanent magnet insertion holes 703, stress relief holes 705, shaft insertion holes 706, conduit forming holes 711H, conduit forming holes 712H, conduit forming holes 713H, and conduit forming holes 714H formed therein.

[0026] As shown in Fig. 4, there are a total of eight permanent magnet insertion holes 701 and eight permanent magnet insertion holes 703 formed at equal intervals in the circumferential direction. Each permanent magnet insertion hole 701 is a hole that penetrates the plate-shaped member 71, and as shown in Fig. 2, a permanent magnet 702 is inserted into each permanent magnet insertion hole 701. Similarly, each permanent magnet insertion hole 703 is a hole that penetrates the plate-shaped member 71, and as shown in Fig. 2, a permanent magnet 704 is inserted into each permanent magnet insertion hole 701.

[0027] Furthermore, a pair of permanent magnets 702 and 704 adjacent to each other in the circumferential direction forms one pole of the motor 1. For example, the permanent magnets 702 and 704 form a south pole or a north pole in the region M shown in Fig. 2. Similarly, other pairs of permanent magnets 702 and 704 also form such poles.

[0028] As shown in Fig. 4, there are four stress relief holes 705 in total, all of which are formed at equal intervals in the circumferential direction. Each of the stress relief holes 705 is a hole that penetrates the plate-like member 71, and is formed for the purposes of alleviating stress that concentrates at specific points on the plate-like member 71 due to centrifugal force generated as the rotor 70 rotates, and for the purposes of reducing the weight of the rotor 70. Bolts may also be inserted into the stress relief holes 705 when the rotor 70 is assembled.

[0029] The shaft insertion hole 706 is a circular hole that is provided in the center of the plate-like member 71 and passes through the plate-like member 71. The shaft 60 is inserted into the shaft insertion hole 706.

[0030] Conduit forming hole 711H, conduit forming hole 712H, conduit forming hole 713H and conduit forming hole 714H are all recesses formed in the surface of plate-shaped member 71. Specifically, conduit forming hole 711H, conduit forming hole 712H, conduit forming hole 713H and conduit forming hole 714H are all holes in which the surface of plate-shaped member 71 is recessed toward the +X direction in a narrow rectangular region that is elongated in a direction perpendicular to the rotation axis of rotor 70. Furthermore, conduit forming hole 711H, conduit forming hole 712H, conduit forming hole 713H and conduit forming hole 714H all have the same depth.

[0031] Conduit forming holes 711H, 712H, 713H, and 714H are located at the same circumferential position and have the same short side lengths. Furthermore, the long sides of conduit forming holes 711H, 712H, 713H, and 714H are parallel to a line perpendicular to the rotational axis of rotor 70. Furthermore, conduit forming holes 711H, 712H, 713H, and 714H are arranged in the following order from shaft insertion hole 706 outward. Furthermore, conduit forming holes 711H, 712H, 713H, and 714H are formed between two adjacent poles.

[0032] Fig. 5 is a diagram showing a plate-shaped member having holes formed therein that form the rotor internal conduits according to the embodiment. As shown in Fig. 5, plate-shaped member 72 has permanent magnet insertion holes 701, permanent magnet insertion holes 703, stress relief holes 705, shaft insertion holes 706, conduit forming holes 721H, conduit forming holes 722H, and conduit forming holes 723H formed therein. Note that permanent magnet insertion holes 701, permanent magnet insertion holes 703, stress relief holes 705, and shaft insertion holes 706 shown in Fig. 5 are the same as permanent magnet insertion holes 701, permanent magnet insertion holes 703, stress relief holes 705, and shaft insertion holes 706 shown in Fig. 4, respectively.

[0033] Conduit forming holes 721H, 722H, and 723H are all recesses formed in the surface of plate-shaped member 72. Specifically, conduit forming holes 721H, 722H, and 723H are all holes in which the surface of plate-shaped member 71 is recessed toward the −X direction in a narrow rectangular region that is elongated in a direction perpendicular to the rotation axis of rotor 70. Conduit forming holes 721H, 722H, and 723H all have the same depth.

[0034] Conduit forming holes 721H, 722H, and 723H are positioned at the same circumferential position and have the same short side lengths as conduit forming holes 711H, 712H, 713H, and 714H. Conduit forming holes 721H, 722H, and 723H have long sides parallel to a line perpendicular to the rotational axis of rotor 70. Conduit forming holes 721H, 722H, and 723H are arranged outward from shaft insertion hole 706 in the following order: conduit forming hole 721H, conduit forming hole 722H, conduit forming hole 723H. Conduit forming holes 721H, 722H, and 723H are formed between two adjacent poles.

[0035] Plate-like member 71 and plate-like member 72 are stacked such that the opening of conduit forming hole 711H, conduit forming hole 712H, conduit forming hole 713H, or conduit forming hole 714H overlaps in the X direction with the opening of conduit forming hole 721H, conduit forming hole 722H, or conduit forming hole 723H. In this case, the +Z side of the opening of conduit forming hole 711H overlaps in the X direction with the -Z side of the opening of conduit forming hole 721H. Also, in this case, the +Z side of the opening of conduit forming hole 721H overlaps in the X direction with the -Z side of the opening of conduit forming hole 712H.

[0036] Similarly, in the above case, the +Z side of the opening of conduit forming hole 712H and the -Z side of the opening of conduit forming hole 722H overlap in the X direction. In the above case, the +Z side of the opening of conduit forming hole 722H and the -Z side of the opening of conduit forming hole 713H overlap in the X direction. In the above case, the +Z side of the opening of conduit forming hole 713H and the -Z side of the opening of conduit forming hole 723H overlap in the X direction. In the above case, the +Z side of the opening of conduit forming hole 723H and the -Z side of the opening of conduit forming hole 714H overlap in the X direction.

[0037] Due to the shapes and arrangement of the above-described conduit forming holes 711H, 721H, etc., the rotor-internal conduit 70P is formed along a straight line perpendicular to the rotation axis of the rotor 70, and meanders within a plane including the straight line. The rotor-internal conduit 70P also communicates with the outlet of the conduit 603P, and is a pipe that communicates with the space between the stator 80 and the rotor 70.

[0038] Furthermore, the internal-rotor conduit 70P has an outlet formed within a predetermined distance from the intersection of a plane perpendicular to the rotational axis of the rotor 70 and passing through the center of the rotor 70 in the direction of the rotational axis with the coil 82 attached to the stator 80. The portion of the coil 82 close to the intersection has larger eddy current loss and is more likely to generate heat than the other portions. Therefore, the predetermined distance needs to be a distance that allows a sufficient amount of refrigerant to be supplied from the internal-rotor conduit 70P to the portion of the coil 82 close to the intersection where heat generation due to eddy current loss is greater than other portions of the coil 82.

[0039] The rotor 70 also includes a clamp 73, a clamp 74, a clamp cover 75, and a clamp cover 76. The clamps 73 and 74 are annular members that clamp and fasten the plate-like members 71, 72, and other plate-like members that form the rotor 70 in the X direction. The clamp cover 75 is an annular member that covers the end face of the rotor 70 on the +X direction side and the clamp 73. The clamp cover 76 is an annular member that covers the end face of the rotor 70 on the -X direction side and the clamp 74.

[0040] As shown in Figures 1 and 2, the stator 80 includes a stator core 81 and a coil 82. The stator core 81 is a cylindrical member into which the shaft 60 and the rotor 70 are inserted, and has a plurality of teeth formed on the inside. The coil 82 is formed by winding a copper wire around the teeth. When current is applied to the coil 82, it generates a magnetic force that rotates the rotor 70.

[0041] Next, the flow of refrigerant according to this embodiment will be described with reference to Figures 1 and 2. After flowing into conduit 21, the refrigerant flows through in-casing conduit 20P, in-casing conduit 30P, and in-casing conduit 50P, and then flows into conduit 601P, which constitutes in-shaft conduit 60P, as shown by the arrows in Figure 1. Next, the refrigerant flows through conduits 601P, 602P, and 603P, which constitute in-shaft conduit 60P, and then flows into in-rotor conduit 70P.

[0042] The refrigerant present inside conduit 603P or in-rotor conduit 70P is released into the space between stator 80 and rotor 70 by centrifugal force generated by the rotation of shaft 60 and rotor 70, and cools coil 82, etc. Next, the refrigerant passes through the space between stator 80 and rotor 70 and flows down to the −Z direction side of housing 20 or housing 30.

[0043] The refrigerant then passes through filter 22 and flows into conduit 23. The refrigerant that has flowed into conduit 23 flows into a pump installed at the end of conduit 23 and is sent to a water-cooled cooler installed at the end of the pump. The refrigerant that has been cooled by the water-cooled cooler flows back into conduit 21.

[0044] The motor 1, which is an example of a rotating electric machine according to an embodiment, has been described above. The motor 1 includes an in-shaft conduit 60P and an in-rotor conduit 70P. The in-shaft conduit 60P communicates with the outlet of the in-casing conduit 50P formed in the housing of the motor 1 and the inlet of the in-rotor conduit 70P. The in-rotor conduit 70P is formed by stacking plate-shaped members 71 and 72 such that a portion of the openings of the conduit forming holes 711H and 712H overlap in the direction of the rotation axis. The outlet of the in-rotor conduit 70P communicates with the space between the stator 80 and the rotor 70.

[0045] As a result, the motor 1 can supply the refrigerant directly to the space between the stator 80 and the rotor 70, thereby efficiently cooling the coil 82. The motor 1 can also supply the refrigerant to the in-shaft conduit 60P, thereby efficiently cooling the shaft 60P. The motor 1 can also supply the refrigerant to the in-rotor conduit 70P, thereby efficiently cooling the rotor 70. Furthermore, by efficiently cooling the coil 82, the motor 1 can reduce the volume of the coil 82, thereby reducing the cost of manufacturing the coil 82 and enabling the motor 1 to be made more compact.

[0046] Furthermore, the rotor internal conduit 70P is perpendicular to the rotation axis of the rotor 70, and has an outlet formed within a predetermined distance from the intersection of a plane passing through the center of the rotor 70 in the direction of the rotation axis and the coil 82 attached to the stator 80. This allows the motor 1 to supply a sufficient amount of refrigerant to the part of the coil 82 that generates particularly large amounts of heat due to eddy current loss, thereby allowing this part to be sufficiently cooled.

[0047] Furthermore, the internal-rotor conduit 70P is formed by stacking two types of plate-like members, 71 and 72, which have holes formed in different positions. This makes it possible to form the rotor 70 of the motor 1 using only three types of members: the plate-like members 71 and 72, and the conduit-forming holes 711H for forming the internal-rotor conduit 70P, and a plate-like member that does not have the conduit-forming holes 721H. Therefore, the motor 1 requires only three types of molds to manufacture the rotor 70, thereby reducing the cost required to manufacture the rotor 1.

[0048] Furthermore, the intra-rotor conduit 70P is formed along a straight line perpendicular to the rotation axis of the rotor 70. This allows the motor 1 to efficiently transfer the centrifugal force generated by the rotation of the rotor 70 to the refrigerant present inside the intra-rotor conduit 70P and efficiently release the refrigerant into the space between the stator 80 and the rotor 70. Therefore, the motor 1 efficiently cools the coil 82.

[0049] Furthermore, conduit forming holes 711H, 712H, 713H, and 714H are formed between two adjacent poles on rotor 70. Similarly, conduit forming holes 721H, 722H, and 723H are formed between two adjacent poles on rotor 70. This allows motor 1 to prevent magnetic flux saturation and torque reduction caused by the path of magnetic flux passing through each pole becoming narrower.

[0050] In the above-described embodiment, the conduit-forming holes 711H and the like shown in Fig. 4 are recesses formed in the surface of the plate-like member 71, but this is not intended to be limiting. Furthermore, the conduit-forming holes 712H and the like shown in Fig. 5 are recesses formed in the surface of the plate-like member 72, but this is not intended to be limiting. At least one of the holes forming the rotor conduits may be a through-hole that penetrates the plate-like member.

[0051] Furthermore, the outlet of the in-rotor conduit 70P may be formed within a predetermined distance from a portion of the coil 82 attached to the stator 80 where the temperature exceeds a predetermined temperature. This predetermined distance must be such that a sufficient amount of refrigerant can be supplied from the in-rotor conduit 70P to the portion of the coil 82 where the temperature exceeds the predetermined temperature. This allows the motor 1 to supply a sufficient amount of refrigerant to a portion of the coil 82 where the temperature exceeds the predetermined temperature due to the influence of the structure of the casing 20 or other components around the coil 82, and thereby sufficiently cool that portion.

[0052] Furthermore, in the above-described embodiment, the rotor-internal conduit 70P is formed along a straight line perpendicular to the rotational axis of the rotor 70, but this is not limiting. The rotor-internal conduit according to the embodiment may have any path from the inlet to the outlet. For example, the rotor-internal conduit according to the embodiment may be formed along a straight line that passes through the rotational axis of the rotor 70 from the inlet to the outlet but is not perpendicular to the rotational axis of the rotor 70. Furthermore, for example, the rotor-internal conduit according to the embodiment may be curved midway. In these cases, three or more types of plate-shaped members having different hole patterns are required.

[0053] In the above-described embodiment, the motor 1 is a motor mounted on an electric vehicle to rotate the wheels of the electric vehicle, but the present invention is not limited to this. The motor according to the embodiment may be a motor used for purposes other than rotating the wheels of an electric vehicle.

[0054] In the above-described embodiment, the motor 1 has been described as an example of a rotating electric machine, but the present invention is not limited to this. The rotating electric machine according to the embodiment may be a generator that converts mechanical energy into electrical energy, instead of the motor 1 that converts electrical energy into mechanical energy.

[0055] The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. In other words, the present invention includes embodiments in which various modifications, substitutions, design changes, etc. have been made based on the spirit of the present invention, and does not exclude these embodiments. [Explanation of symbols]

[0056] 1...motor, 60...shaft, 600P...conduit inside shaft, 70...rotor, 70P...conduit inside rotor, 711H, 712H, 713H, 714H, 721H, 722H, 723H...holes, 80...stator, 82...coil

Claims

1. a cylindrical stator; a rotor disposed inside the stator and formed by stacking plate-shaped members in the direction of the rotation axis; a shaft fitted to the rotor and supporting the rotor in a manner that allows the rotor to rotate around the rotation axis; Equipped with the rotor is formed by stacking a plurality of the plate-like members, each having at least one conduit-forming hole, in a state in which portions of openings of the conduit-forming holes overlap in the direction of the rotation axis, and has an internal conduit whose outlet communicates with a space between the stator and the rotor; the shaft has an internal conduit that communicates with an outlet of an internal conduit formed in a motor housing and an inlet of the internal conduit; Rotating electric motor.

2. At least one of the conduit-forming holes is a depression formed on the surface of the plate-like member or a through-hole penetrating the plate-like member. The rotating electric machine according to claim 1 .

3. the rotor internal conduit has an outlet formed within a predetermined distance from an intersection of a plane passing through the center of the rotor in the direction of the rotation axis and a coil attached to the stator, the plane being perpendicular to the rotation axis of the rotor; The rotating electric machine according to claim 2 .

4. the rotor internal conduit has an outlet formed within a predetermined distance from a portion of the coil attached to the stator where the temperature is equal to or higher than a predetermined temperature; The rotating electric machine according to claim 2 .

5. the rotor internal conduit is formed by stacking two types of plate-like members, the positions of which the conduit forming holes are formed being different from each other; The rotating electric machine according to claim 2 or 3.

6. the rotor internal conduit is formed along a straight line perpendicular to the rotation axis of the rotor; The rotating electric machine according to claim 2 or 3.

7. At least one of the conduit forming holes is formed between two adjacent poles in the rotor. The rotating electric machine according to claim 2 or 3.

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