Rotary electric machine

Abstract

To provide a rotary electric machine provided with a direct cooling structure capable of sufficiently ensuring a flow rate of a coolant that flows in a cooling flow path in a simple and low cost structure.SOLUTION: A rotary electric machine in which a rotor 2 is cooled with a liquid coolant comprises: an introduction port 13 for supplying the liquid coolant to a horizontal end surface relative to a shaft 5 of the rotor 2; a first flow path 9 provided in the rotor 2 so as to flow the liquid coolant in the shaft 5 direction; a second flow path 10 provided on the first flow path inlet 9a side of the first flow path 9; and a third flow path 11 provided on the first flow path outlet 9b side of the first flow path 9. The second flow path 10 has a mouth opening toward the radial inside. The third flow path 11 has a mouth opening toward the radial outside. The introduction port 13 is provided radially inner side than the mouth of the second flow path 10 so as to discharge the liquid coolant toward the mouth of the second flow path 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 describes a rotating electric machine that "includes a rotor, a shaft that passes through the rotor along the rotation axis and is supported on a bearing, a stator that houses the rotor inside, a rotor cover that is attached to the axial end face of the rotor, and a housing having a flow path for supplying oil to the bearing. The rotor cover forms a concentric gap between the shaft and has an oil receiving portion that receives oil from the bearing in the gap, and an oil distribution passage that communicates with the oil receiving portion and the axial end face of the rotor. The rotating electric machine cools the rotor by supplying oil that has been guided into the gap to the oil distribution passage by centrifugal force."

[0003] Patent document 2 describes a motor in which "in a twin-rotor motor equipped with an inner rotor and an outer rotor, an oil passage is provided on the outer periphery of the outer rotor. Cooling oil is supplied by being discharged from a supply part fixed to the case onto the rotating surface of the outer rotor. The cooling oil flows into the oil receiving part by the action of centrifugal force, and then flows into the interior from the supply port. After passing through the oil passage, the cooling oil is discharged to the outside from the discharge port. In such a cooling structure, the supply part discharges the cooling oil in a direction that gives a speed component along the rotational direction. Furthermore, the discharge part is provided at a position closer to the center of rotation than the oil passage, and the rotational speed of the cooling oil is reduced before being discharged." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7243780 [Patent Document 2] JP 2000-358345 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the fields of industry and mobility, rotating electric machines such as motors need to cool their stators and rotors, and cooling structures are provided for this purpose. In industrial applications, there is a demand for smaller motors with higher power density to reduce installation space. In recent years, the electrification of mobility has progressed, and motors for aircraft, which have strict weight restrictions, and then for automobiles are being made to have higher power density. In these circumstances, there is a demand for further improvements in the cooling performance of rotating electric machines in both fields.

[0006] Direct liquid cooling methods such as oil cooling are effective for improving the cooling performance of rotating electrical machines, but the cooling structure for the rotor tends to be complicated because it is a moving part.

[0007] The above-mentioned Patent Documents 1 and 2 and the like are known as background art of the present invention.

[0008] Patent document 1 discloses a technology in which cooling oil is supplied to the inside of a motor housing through a bearing from a flow passage provided radially in a housing cover at the axial end side of a rotating electric machine, and after flowing radially outward within a radial flow passage formed by installing a rotor cover at the rotor end, the oil passes through a cooling flow passage provided axially in the rotor to directly cool the rotor.

[0009] Furthermore, Patent Document 2 discloses a technology for directly cooling the rotor by providing an oil receiver at the end of the rotor, spraying oil from a supply unit toward the oil receiver, and guiding the cooling oil in the oil receiver to an axial oil passage provided in the rotor.

[0010] Cooling the rotor of a rotating electrical machine involves the following problems.

[0011] First, because the rotor is a rotating body, the coolant introduction path tends to be complicated. Also, depending on the cooling structure, it is technically difficult to completely seal the flow path. For these reasons, rotor cooling structures have the problem of being expensive.

[0012] Secondly, as mentioned in Patent Documents 1 and 2, the refrigerant in the cooling passage can be caused to flow by utilizing the centrifugal force acting on the radial passage of the rotor, but when the rotation speed is slow, the centrifugal force becomes weaker, resulting in a problem of a decrease in the refrigerant flow rate.

[0013] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a rotating electric machine equipped with a direct cooling structure that can ensure a sufficient flow rate of the coolant flowing through the cooling passage with a simple and low-cost structure. [Means for solving the problem]

[0014] The present invention includes multiple means for solving the above-mentioned problems. One example is a rotating electric machine that cools a rotor with a liquid refrigerant, comprising: an inlet port that supplies the liquid refrigerant to an end face of the rotor that is horizontal to the rotational axis of the rotor; a first flow path provided in the rotor and that flows the liquid refrigerant in the direction of the rotational axis; a second flow path provided on the inlet side of the first flow path; and a third flow path provided on the outlet side of the first flow path, wherein the second flow path has an opening that opens radially inward and the third flow path has an opening that opens radially outward, and the inlet port is provided radially inward of the opening of the second flow path and is arranged to discharge the liquid refrigerant in the direction of the opening of the second flow path. Effect of the Invention

[0015] According to the present invention, it is possible to provide a direct cooling structure that can ensure a sufficient flow rate of the coolant flowing through the cooling channel with a simple and low-cost structure. Other objects, configurations and effects than those described above will become apparent from the description of the following embodiments. [Brief description of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a rotating electric machine to which a first embodiment is applied; [Diagram 2] 1 is a view of a rotor of a rotating electric machine according to a first embodiment, seen from an upper end position of an iron core. [Diagram 3]4 is an explanatory diagram of a structure for enhancing the centrifugal effect of the second flow passage of the rotary electric machine according to the first embodiment; FIG. [Figure 4] FIG. 11 is an explanatory diagram of a rotating electric machine to which a second embodiment is applied. [Diagram 5] 11 is a view of a rotor of a rotating electric machine according to a second embodiment, seen from the upper end position of the core. FIG. [Figure 6] 11 is an explanatory diagram of a rotor of a rotating electric machine to which a third embodiment is applied. FIG. [Figure 7] FIG. 11 is an explanatory diagram of a rotating electric machine to which a fourth embodiment is applied. [Figure 8] 13 is a view of a rotor of a rotating electric machine according to a fourth embodiment, seen from the upper end position of the core. FIG. [Figure 9] FIG. 11 is an explanatory diagram of a rotating electric machine to which a fifth embodiment is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a rotating electric machine according to the present invention will be described with reference to the drawings. In the drawings used in this specification, the same or corresponding components are designated by the same or similar reference numerals, and repeated description of these components may be omitted.

[0018] <Example 1> A rotating electric machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

[0019] Hereinafter, an overall configuration of a rotating electric machine to which the first embodiment is applied will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is an explanatory diagram of a rotating electric machine to which the first embodiment is applied. Fig. 2 is an explanatory diagram of a structure of a rotor of the rotating electric machine of Fig. 1, and is a cross-sectional view taken along line AA of Fig. 1.

[0020] The rotating electric machine 30 shown in Figures 1 and 2 is an inner rotor type rotating electric machine in which a stator 1 is arranged on its outer diameter side and a rotor 2 having a permanent magnet 4 on its inner diameter side via an air gap 3 between this stator 1 and the rotor 2, and which is also a vertical type rotating electric machine in which the rotating shaft is installed in the direction of gravity.

[0021] 1, rotor 2 is cooled by a liquid refrigerant. The structure for cooling will be described later.

[0022] The rotor 2 has a rotating shaft that is rotated by a shaft 5, and has a plurality of permanent magnets 4 arranged in the circumferential direction. The rotor 2 is supported by bearings 6 so as to be freely rotatable with respect to a stator 1 fixed to a housing 12.

[0023] In the rotating electric machine 30 of this embodiment, a first flow passage 9, which is a passage for flowing liquid refrigerant in the axial direction of the rotating shaft, is provided in the rotor core 8 inside the rotor 2. The first flow passage 9 is generally formed by punching holes in advance at corresponding positions in the electromagnetic steel sheets that form the rotor core 8, and then laminating the electromagnetic steel sheets to create the rotor core 8.

[0024] As shown in FIG. 2, in the first embodiment, eight first flow passages 9 are provided at equal intervals of 45 degrees in the circumferential direction, but the number of first flow passages in the circumferential direction is not limited to eight, and the number of first flow passages at the same radial position is not limited to one. The intervals between adjacent first flow passages 9 do not need to be equal. Furthermore, although the example shows that all the first flow passages 9 are at the same radial position, the radial position is not limited. In other words, the number of first flow passages 9 and their positions in the circumferential direction and radial direction can be appropriately designed and selected so as to satisfy the performance required for cooling the cooling target including the permanent magnet 4 and the electrical design of the rotating electric machine 30.

[0025] In a vertical type rotating electric machine 30 such as that of this embodiment, a second flow passage 10 is provided on the side of a first flow passage inlet 9a of the first flow passage 9 located on the vertical upper side of the first flow passage 9. The second flow passage 10 extends radially inward from the first flow passage inlet 9a of the first flow passage 9, and has an opening on the inner diameter side.

[0026] In this embodiment, a plurality of first plate blades 15 are provided radially, extending radially inward from the first flow passage inlet 9a side of the first flow passage 9. The upper portion and radially outer end portion of the first plate blade 15 are covered by a first cover 16 that closes the first flow passage inlet 9a of the first flow passage 9 from the radially outer side to the radially inner side, i.e., that covers the first flow passage inlet 9a from the radially outer side to the radially inner side.

[0027] The first plate blade 15 and the first cover 16 form a second flow passage 10 .

[0028] The first plate blade 15 is not particularly limited in the circumferential position with respect to the first flow passage 9, and may be located at any position between the multiple first flow passage inlets 9a. For example, the first plate blade 15 may be located at an equal distance from the adjacent first flow passage inlets 9a, or may be located immediately behind the first flow passage inlets 9a in the circumferential direction, and is not particularly limited.

[0029] Furthermore, in the vertical type rotating electric machine 30 as in this embodiment, a third flow passage 11 is provided on the side of the first flow passage outlet 9b of the first flow passage 9 located on the vertical lower side of the first flow passage 9. The third flow passage 11 extends radially outward from the first flow passage outlet 9b of the first flow passage 9, and has an opening on the outer diameter side.

[0030] In this embodiment, a plurality of second plate blades 17 are provided radially, extending radially outward from the first flow passage outlet 9b side of the first flow passage 9. The lower portion and radially inner end portion of the second plate blade 17 are covered by a second cover 18 provided to close the first flow passage outlet 9b of the first flow passage 9 from its radially inner side to its radially outer side, that is, to cover the first flow passage outlet 9b from its radially inner side to its radially outer side.

[0031] The second plate blade 17 and the second cover 18 form a third flow passage 11.

[0032] The second plate blade 17 is not particularly limited in terms of its circumferential position relative to the first flow passage 9, and may be located at any position between the multiple first flow passage outlets 9b, or at a position equidistant from the multiple first flow passage outlets 9b, or may be located immediately behind the circumferential position of the first flow passage outlet 9b, and is not particularly limited.

[0033] The flow of the liquid refrigerant that cools the rotor 2 is also shown by arrows in FIG.

[0034] 1, refrigerant inlet 13 supplies liquid refrigerant to an end face horizontal to the rotation axis of rotor 2. More specifically, it is provided vertically above rotor 2 and radially inward of the inner diameter side opening of second flow passage 10 so as to discharge liquid refrigerant radially inward from the opening of second flow passage 10 and toward the opening of second flow passage 10.

[0035] In this configuration, the refrigerant falls to the upper end of the rotor 2 by natural flow, flows into the second flow passage 10, flows radially outward in the second flow passage 10 by the action of centrifugal force, flows into the first flow passage 9 from above, flows axially downward, and then flows into the third flow passage 11. The refrigerant in the third flow passage 11 is pumped radially outward by the action of centrifugal force. It then accumulates in the lower part of the housing 12. The refrigerant accumulated in the lower part of the housing 12 is discharged from the outlet 14.

[0036] Next, the effects of this embodiment will be described.

[0037] The rotating electric machine 30 of the above-mentioned embodiment 1 of the present invention cools the rotor 2 with a liquid refrigerant, and includes an inlet 13 that supplies the liquid refrigerant to an end face of the rotor 2 that is horizontal to the rotation axis of the rotor 2, a first flow path 9 that is provided in the rotor 2 and allows the liquid refrigerant to flow in the direction of the rotation axis, a second flow path 10 that is provided on the first flow path inlet 9a side of the first flow path 9, and a third flow path 11 that is provided on the first flow path outlet 9b side of the first flow path 9, the second flow path 10 having an opening that opens radially inward, and the third flow path 11 having an opening that opens radially outward, and the inlet 13 is provided radially inward of the opening of the second flow path 10 and arranged to discharge the liquid refrigerant in the direction of the opening of the second flow path 10.

[0038] According to this configuration, the centrifugal force acts on the refrigerant at two points, the second flow path and the third flow path, and the centrifugal forces acting on the refrigerant in the second flow path 10 and the third flow path 11 are added together, so that the centrifugal pump action is increased, and the flow rate of the refrigerant cooling the rotor 2 can be increased. In particular, since the centrifugal force acts on both the first flow path inlet 9a side and the first flow path outlet 9b side, the refrigerant flows smoothly even if the first flow path 9 has a small diameter. In addition, even if the radial position of the first flow path 9 changes, as long as the positions of the inlet of the second flow path 10 and the outlet of the third flow path 11 do not change, there is an advantage that the total centrifugal force acting on the refrigerant does not change and the centrifugal pump action is stable regardless of the radial position of the first flow path 9.

[0039] In addition, the second flow passage 10 has a first plate blade 15 extending radially inward from the first flow passage inlet 9a side of the first flow passage 9, and a first cover 16 blocking the first flow passage inlet 9a of the first flow passage 9 from its radial outside to its radial inside, and the third flow passage 11 has a second plate blade 17 extending radially outward from the first flow passage outlet 9b side of the first flow passage 9, and a second cover 18 blocking the first flow passage outlet 9b of the first flow passage 9 from its radial inside to its radial outside, so that a large amount of liquid refrigerant can be guided to the first flow passage 9 with a simple configuration.

[0040] Furthermore, since the rotating shaft of the rotating electric machine 30 is installed in the direction of gravity, and the inlet 13 is a vertical shaft arranged vertically above the rotor 2, the coolant can flow down from the inlet 13 under natural flow and reach the inlet opening of the second flow passage 10, so there is no need for a sealed flow passage, and there is no need to pressurize the coolant into the housing 12, so there is no need to pressurize the coolant and spray it from the inlet 13, and the pressure of the coolant circulation pump can be reduced. This makes it possible to simplify the cooling structure compared to the conventional one, thereby suppressing an increase in costs. Furthermore, there is no need to connect the inlet of the second flow passage 10 with a sealed flow passage. If it is necessary to control the flow rate of the inflow, a pump may be used, but even in that case, high pressure is not required, so the pump output can be reduced.

[0041] The rotating electric machine of this embodiment is not limited to the above-mentioned configuration, and may be configured as follows. A modified rotating electric machine will be described below with reference to Fig. 3. Fig. 3 is a diagram showing a modified rotating electric machine 30A that enhances the centrifugal pump action of the second flow path 10A.

[0042] In the rotating electric machine 30 of FIG. 1, the first plate blade 15 is long enough to fit within the first cover 16, whereas in the rotating electric machine 30A of FIG. 3, the first plate blade 15A of the second flow passage 10A of the rotor 2A extends to the inner diameter side beyond the inlet 13.

[0043] In the rotating electric machine 30A having such a configuration, the first plate blades 15A extend to the inner diameter side of the inlet 13, so that the refrigerant flowing in from the inlet 13 falls between the first plate blades 15A and receives centrifugal force at this point, thereby enhancing the centrifugal pump action in the second flow passage 10A.

[0044] <Example 2> Second embodiment A rotating electric machine according to the present invention will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is an explanatory diagram of the rotating electric machine to which the second embodiment is applied, and Fig. 5 is a view of the rotor of the rotating electric machine according to the second embodiment as viewed from the upper end position of the core.

[0045] In the first embodiment, the first flow passage 9 is configured to be parallel to the rotation axis, that is, to be straight in the vertical direction. Naturally, in this case, the centrifugal force does not directly act on the refrigerant in the first flow passage 9.

[0046] Generally, the first flow passage 9, which is an axial flow passage for cooling the rotor 2, cannot be made very large in many cases. This is because reducing the amount of the rotor core 8 increases the magnetic flux density, which deteriorates the characteristics of the rotating electric machine.

[0047] Therefore, the refrigerant flowing through the first flow passage 9 becomes a flow similar to a gap flow, and may be subjected to large viscous friction. For this reason, even in the first flow passage 9, it may be better to apply some kind of pumping action to the refrigerant to actively discharge the refrigerant.

[0048] To achieve this, in the rotating electric machine 30B of this embodiment, as shown in Figures 4 and 5, the first flow path outlet 9b1 of the first flow path 9B is positioned radially outward from the first flow path inlet 9a1 of the first flow path 9B.

[0049] More specifically, the radial position of the first flow passage inlet 9a1 of the first flow passage 9B in the rotor core 8B within the rotor 2B is located on the inner diameter side than the radial position of the first flow passage inlet 9a of the first flow passage 9 in Example 1.

[0050] Accordingly, the radial positions of the two members, the first plate blade 15B and the first cover 16B, which form the second flow passage 10B, are also located on the radially inner side.

[0051] The other configurations and operations are substantially the same as those of the rotating electric machine of the first embodiment described above, and the details are omitted here.

[0052] In the rotating electric machine according to the second embodiment of the present invention, substantially the same effects as those of the rotating electric machine according to the first embodiment described above can be obtained.

[0053] In addition, the first flow passage outlet 9b1 of the first flow passage 9B is arranged radially outward from the first flow passage inlet 9a1 of the first flow passage 9B, so that a pump action due to a centrifugal force acts on the refrigerant in the first flow passage 9B by the difference in radius between the first flow passage inlet 9a1 and the first flow passage outlet 9b1 of the first flow passage 9B, and the refrigerant can be discharged. The configuration of this embodiment is particularly effective when the flow passage cross-sectional area of ​​the first flow passage 9B cannot be made very large.

[0054] In addition, the radial position of the first flow passage outlet 9b1 of the first flow passage 9B in the rotor core 8B within the rotor 2B may be located on the outer diameter side of the radial position of the first flow passage outlet 9b of the first flow passage 9 in Example 1, and the radial positions of the first flow passage inlet and the first flow passage outlet may both be changed to the inner diameter and outer diameter sides, respectively.

[0055] <Example 3> A rotating electric machine according to a third embodiment of the present invention will be described with reference to Fig. 6. Fig. 6 is an explanatory diagram of a rotor of the rotating electric machine to which the third embodiment is applied.

[0056] The rotating electric machine 30C of this embodiment, like the rotating electric machine 30B of embodiment 2, is one of the methods of applying a pumping action to the refrigerant in the first flow path 9C, and the first flow path outlet 9b2 of the first flow path 9C is positioned circumferentially offset in the opposite direction to the rotational direction of the rotor 2 from the first flow path inlet 9a1 of the first flow path 9C.

[0057] The section between the first flow passage inlet 9a1 and the first flow passage outlet 9b2 of the first flow passage 9C may be linear or curved with the same curvature as the outer periphery of the rotor core 8C, without any particular limitation.

[0058] The other configurations and operations are substantially the same as those of the rotating electric machine of the first embodiment described above, and the details are omitted here.

[0059] In the rotating electric machine according to the third embodiment of the present invention, substantially the same effects as those of the rotating electric machine according to the first embodiment described above can be obtained.

[0060] In addition, the first flow passage outlet 9b2 of the first flow passage 9C is arranged offset in the circumferential direction opposite to the rotation direction of the rotor 2 from the first flow passage inlet 9a2 of the first flow passage 9C, so that the refrigerant in the first flow passage 9C receives a force pushing it downward, and therefore the refrigerant in the first flow passage 9C can also be discharged. This embodiment is also effective when the flow passage cross-sectional area of ​​the first flow passage 9C cannot be made very large. It is also possible to dispose the first passage outlet radially outward from the first passage inlet as in the second embodiment, and to displace it in the circumferential direction opposite to the direction of rotation of the rotor 2 as in the third embodiment.

[0061] <Example 4> A rotating electric machine according to a fourth embodiment of the present invention will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is an explanatory diagram of the rotating electric machine to which the fourth embodiment is applied, and Fig. 8 is a view of the rotor of the rotating electric machine according to the fourth embodiment as viewed from the upper end position of the core.

[0062] A rotating electric machine 30D of this embodiment shown in FIGS. 7 and 8 is an example of a specific structure for easily realizing the structure of the first flow passage 9B of the rotating electric machine 30B of the second embodiment.

[0063] The first flow passage 9D provided in the rotor core 8D of the rotor 2D is composed of a slit-shaped through hole 19 having a radially long cross section, a first wedge 20 provided on the radially outer side of the through hole 19 and having a width that increases toward the first flow passage inlet 9a of the first flow passage 9D, and a second wedge 21 provided on the radially inner side of the through hole 19 and having a width that increases toward the first flow passage outlet 9b of the first flow passage 9D.

[0064] The composition of the first wedge 20 and the second wedge 21 of the fourth embodiment is determined according to the electrical characteristics of the rotating electric machine.

[0065] The other configurations and operations are substantially the same as those of the rotating electric machine of the first embodiment described above, and the details are omitted here.

[0066] In the rotating electric machine according to the fourth embodiment of the present invention, substantially the same effects as those of the rotating electric machine according to the first embodiment described above can be obtained.

[0067] In addition, the first flow passage 9D is formed by a slit-shaped through hole 19 having a radially long cross section provided in the iron core of the rotor 2, a first wedge 20 which is wider toward the first flow passage inlet 9a of the first flow passage 9D and provided on the radially outer side of the through hole 19, and a second wedge 21 which is wider toward the first flow passage outlet 9b of the first flow passage 9D and provided on the radially inner side of the through hole 19.This means that only one type of mold is required to punch out the electromagnetic steel plate of the rotor core 8, which has the advantage of further reducing costs in implementing the present invention.

[0068] <Example 5> A rotating electric machine according to a fifth embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 is an explanatory diagram of a rotating electric machine to which the fifth embodiment is applied.

[0069] A rotating electric machine 30E of this embodiment shown in FIG. 9 is a horizontal, inner rotor type rotating electric machine whose rotation shaft is installed in a direction perpendicular to gravity.

[0070] In the rotating electric machine 30E of the present embodiment, a first flow passage 9E, which is a flow passage for flowing a liquid refrigerant in the axial direction of the rotating shaft, is provided in a rotor core 8E in a rotor 2E. Furthermore, a second flow passage 10E extending radially inward from the first flow passage inlet 9a4 of the first flow passage 9E and having an opening on the inner diameter side is provided on a first flow passage inlet 9a4 side of the first flow passage 9E located on the inlet 13E side of the first flow passage 9E, and a third flow passage 11E extending radially outward from the first flow passage outlet 9b4 of the first flow passage 9E and having an opening on the outer diameter side is provided on a first flow passage outlet 9b4 side of the first flow passage 9E.

[0071] The structures of the second flow path 10E and the third flow path 11E are substantially the same as those of the second flow path 10 and the third flow path 11 of the first embodiment.

[0072] The rotating electric machine 30E differs from the rotating electric machine 30 of the first embodiment in that an inlet 13E is disposed vertically below a shaft 5E of a rotor 2E, and its shape is such that the amount of protrusion toward the rotor core 8 side is longer than that of the inlet 13 of the first embodiment, etc., and the inlet 13E is bent vertically downward in an L-shape. Also, an outlet 14E is located vertically below a housing 12E.

[0073] The other configurations and operations are substantially the same as those of the rotating electric machine of the first embodiment described above, and the details are omitted here.

[0074] Even in a configuration in which the rotating shaft is installed in a direction perpendicular to gravity and the inlet 13E is disposed vertically below the shaft 5E, as in the rotating motor 30E of the fifth embodiment of the present invention, effects substantially similar to those of the rotating motor of the first embodiment described above can be obtained.

[0075] In addition, even in a horizontal rotating electric machine such as this embodiment, modified configurations of the first flow path and the second flow path such as the modified example of embodiment 1 (FIG. 3) and embodiments 2 to 4 (FIGS. 4 to 8) can be adopted.

[0076] <Other> The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. The above-mentioned embodiment has been described in detail to explain the present invention in an easily understandable manner, and the present invention is not necessarily limited to the embodiment having all of the described configurations.

[0077] It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with the configuration of another embodiment.

[0078] For example, in the first to fifth embodiments, the embodiments are described with respect to an inner rotor type rotating electric machine, but the present invention can be similarly embodied in an outer rotor type rotating electric machine.

[0079] In addition, the method of forming the second flow path and the third flow path is exemplified as using two components, a plate blade and a cover, but this is not limited to this and the flow paths can be formed by a method such as cutting the end plate of the rotor.

[0080] Furthermore, other embodiments conceivable within the technical spirit of the present invention are also included within the scope of the present invention. [Explanation of symbols]

[0081] 1...Stator 2,2A,2B,2D,2E…Rotor 3...Air gap 4...Permanent magnet 5,5E…Shaft 6…Bearing 7…Stator core 8, 8B, 8C, 8D, 8E...Rotor core 9, 9B, 9C, 9D, 9E...First flow path 9a, 9a1, 9a2, 9a4...First flow path inlet 9b, 9b1, 9b2, 9b4...First flow path outlet 10, 10A, 10B, 10D, 10E...Second flow path 11, 11E…Third flow path 12,12E…Housing 13,13E…Inlet 14,14E…Exhaust port 15,15A,15B,15D…1st plate blade 16, 16B, 16D…First cover 17…Second plate blade 18…Second cover 19...Through hole 20…1st wedge 21…Second wedge 30, 30A, 30B, 30C, 30D, 30E... Rotating electric machine

Claims

1. A rotating electric machine in which a rotor is cooled by a liquid refrigerant, an inlet for supplying the liquid refrigerant to an end surface of the rotor that is horizontal to the rotation axis of the rotor; a first flow passage provided in the rotor and allowing the liquid refrigerant to flow in the direction of the rotation axis; a second flow path provided on an inlet side of the first flow path; A third flow path provided on an outlet side of the first flow path, The second flow passage has an opening that opens radially inward, The third flow passage has an opening that opens radially outward, The inlet port is provided radially inward from the opening of the second flow passage and is configured to discharge the liquid refrigerant toward the opening of the second flow passage. Rotating electric motor.

2. 2. The rotating electric machine according to claim 1, the second flow passage has a first plate blade extending radially inward from an inlet side of the first flow passage, and a first cover closing the inlet of the first flow passage from its radially outer side to its radially inner side, The third flow passage has a second plate blade extending radially outward from an outlet side of the first flow passage, and a second cover closing the outlet of the first flow passage from its radially inner side to its radially outer side. Rotating electric motor.

3. 3. The rotating electric machine according to claim 2, The first plate blade extends to an inner diameter side beyond the inlet. Rotating electric motor.

4. 2. The rotating electric machine according to claim 1, The outlet of the first flow passage is disposed radially outward from the inlet of the first flow passage and shifted in the radial direction. Rotating electric motor.

5. 2. The rotating electric machine according to claim 1, The outlet of the first flow passage is disposed at a position shifted in a circumferential direction opposite to a rotation direction of the rotor from the inlet of the first flow passage. Rotating electric motor.

6. 5. The rotating electric machine according to claim 4, The first flow path is A through hole having a slit shape and a cross section elongated in a radial direction is provided in the iron core of the rotor; a first wedge having a larger width toward an inlet side of the first flow passage and provided on a radially outer circumferential side of the through hole; a second wedge having a larger width toward the outlet side of the first flow passage and provided on a radially inner circumferential side of the through hole; Rotating electric motor.

7. 2. The rotating electric machine according to claim 1, The rotating electric machine is installed with a rotating shaft in the direction of gravity, The inlet is disposed vertically above the rotor. Rotating electric motor.

8. 2. The rotating electric machine according to claim 1, The rotating electric machine is installed so that a rotation axis of the rotating electric machine is perpendicular to gravity. The inlet is disposed vertically below the rotation shaft. Rotating electric motor.

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