Rotating machines and electric compressors

Abstract

To provide a rotary machine and a motor compressor comprising the rotary machine, in which a cooling effect of a coil is increased while reducing cost and suppressing a use amount of resin in a resin mold.SOLUTION: A motor housing 10 has: a core outer periphery opposing section 41 on which a stator core 33 is fixed; and a second end outer periphery opposing section 43 which faces an outer periphery of a second coil end 34b. The second coil end 34b is covered with a heat-conductive second resin mold 62. An outer housing 16, which forms a cooling flow path 80 for cooling a stator 31 with the motor housing 10 in-between, is provided in the outside of the motor housing 10. An outer peripheral surface 62a of the second resin mold 62 abuts against an inner peripheral surface 10f of the motor housing 10 in the second end outer periphery opposing section 43. An inner diameter of the second end outer periphery opposing section 43 is smaller than that of the core outer periphery opposing section 41.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotary machine and an electric compressor. [Background technology]

[0002] An example of a conventional rotary machine is disclosed in Patent Document 1. This rotary machine includes a cylindrical motor housing, a drive shaft provided in the motor housing and rotatable about a drive shaft center, and an electric motor provided in the motor housing and rotating the drive shaft.

[0003] The electric motor has a stator and a rotor that is disposed within the stator and has a drive shaft fixed thereto.

[0004] The stator includes a stator core and a coil. The stator core is fixed to the inner peripheral surface of the motor housing and has a cylindrical shape extending in the direction of the drive shaft. The coil is wound around the stator core and has coil ends protruding from the stator core in the direction of the drive shaft.

[0005] The motor housing has a core outer periphery facing portion to which the stator core is fixed, and an end outer periphery facing portion that faces the outer periphery of the coil end.

[0006] The rotating machine further includes a cylindrical outer housing. The outer housing is disposed on the outer periphery of the motor housing and defines a cooling passage between the outer housing and the motor housing, through which a coolant for cooling the stator is supplied. The cooling passage extends spirally along the drive shaft centerline across the region of the core outer periphery facing portion and the region of the end outer periphery facing portion.

[0007] In this rotating machine, in order to efficiently cool the coil ends, the equivalent diameter of the cooling flow passages in the end outer periphery facing portion is set smaller than the equivalent diameter of the cooling flow passages in the core outer periphery facing portion, thereby improving the heat transfer coefficient of the cooling flow passages in the end outer periphery facing portion and efficiently cooling the coil ends.

[0008] In another conventional rotating machine disclosed in Patent Document 2, the coil and the gap between the coil and the stator core are molded with a heat-conductive resin. Heat generated in the coil is transferred to the stator core through the resin mold, and the heat from the stator core is dissipated into the air from heat dissipation fins provided on the outer periphery of the motor housing that fixes the stator core. This enhances the cooling effect of the coil. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-201521 [Patent Document 2] Japanese Utility Model Application Publication No. 03-40860 Summary of the Invention [Problem to be solved by the invention]

[0010] However, in the rotary machine disclosed in Patent Document 1, the coil ends do not abut against the motor housing, so even if the heat transfer coefficient of the cooling flow passage in the end outer periphery opposing portion is improved, there is a limit to how much the cooling effect of the coil ends can be increased.

[0011] Furthermore, in the rotating machine disclosed in Patent Document 2, heat transferred from the coil to the resin mold is transferred to the motor housing via the stator core, resulting in poor heat transfer efficiency. To improve heat transfer efficiency and enhance the cooling effect of the coil ends, it would be advantageous to transfer the heat transferred from the coil to the resin mold directly to the motor housing. However, this requires the resin mold to abut against the motor housing, which requires the use of a large amount of expensive resin material and leads to increased manufacturing costs.

[0012] The present invention has been made in consideration of the above-mentioned conventional situation, and aims to solve the problem of providing a rotary machine that improves the cooling effect of the coil while reducing the amount of resin used in the resin mold to reduce costs, and an electric compressor equipped with such a rotary machine. [Means for solving the problem]

[0013] The rotary machine of the present invention comprises: a cylindrical motor housing; a drive shaft provided in the motor housing and rotatable about a drive axis; an electric motor provided in the motor housing and configured to rotate the drive shaft, the motor housing has a motor chamber that accommodates the drive shaft and the electric motor, the electric motor includes a stator and a rotor disposed within the stator and to which the drive shaft is fixed; The stator includes a cylindrical stator core fixed to an inner peripheral surface of the motor housing and a coil wound around the stator core, The coil has a first coil end that protrudes from one side of the stator core and a second coil end that protrudes from the other side of the stator core, the motor housing has a core outer periphery facing portion to which the stator core is fixed, a first end outer periphery facing portion facing the outer periphery of the first coil end, and a second end outer periphery facing portion facing the outer periphery of the second coil end, the rotary machine has a heat-conductive resin mold that covers the first coil end and the second coil end and abuts against the first end outer circumferential facing portion and the second end outer circumferential facing portion, a cooling flow path through which a coolant for cooling the stator is supplied is formed between the first end outer periphery facing portion, the core outer periphery facing portion, the second end outer periphery facing portion, and an outer housing provided outside the motor housing; The second end outer periphery facing portion has an inner diameter smaller than that of the core outer periphery facing portion. Ku, the motor chamber has a first chamber defined by the first coil end, a first stator core end face of the stator core facing one side in the drive shaft direction, a first end axially opposing portion opposing the first coil end and the first stator core end face in the drive shaft direction, and the first end outer peripheral opposing portion; and a second chamber defined by the second coil end, a second stator core end face of the stator core facing the other side in the drive shaft direction, a second end axially opposing portion opposing the second coil end and the second stator core end face in the drive shaft direction, and the second end outer peripheral opposing portion, The resin mold has a first resin mold filled in the first chamber and covering the entire outer surface of the first coil end and the end face of the first stator core, and a second resin mold filled in the second chamber and covering the entire outer surface of the second coil end and the end face of the second stator core.It is characterized by:

[0014] In the rotating machine of the present invention, a heat-conductive resin mold covering the first coil end abuts against the first end outer periphery facing portion of the motor housing. Similarly, a heat-conductive resin mold covering the second coil end abuts against the second end outer periphery facing portion of the motor housing. Therefore, heat transferred from the first coil end to the resin mold is transferred directly to the motor housing without passing through the stator core. Similarly, heat transferred from the second coil end to the resin mold is transferred directly to the motor housing without passing through the stator core. Furthermore, heat from the stator core is transferred directly from the stator core to the motor housing. The heat transferred to the motor housing is absorbed by the coolant flowing through the cooling channels in the first end outer periphery facing portion, the core outer periphery facing portion, and the second end outer periphery facing portion. In this way, the stator can be effectively cooled by the coolant flowing through the cooling channels.

[0015] In this rotating machine, the inner diameter of the second end outer periphery facing portion of the motor housing is smaller than the inner diameter of the core outer periphery facing portion, and the outer periphery of the resin mold covering the second coil end abuts against the inner periphery of the motor housing at the second end outer periphery facing portion.

[0016] In this case, the amount of resin used in the resin mold between the second coil end and the second end outer circumferential facing portion can be reduced by the amount that the inner diameter of the second end outer circumferential facing portion is reduced.

[0017] Furthermore, the smaller inner diameter of the second end outer peripheral facing portion shortens the heat transfer distance in the resin mold from the second coil end to the motor housing. Shortening the heat transfer distance in the resin mold between the second coil end and the second end outer peripheral facing portion facilitates heat transfer from the second coil end to the second end outer peripheral facing portion of the motor housing via the resin mold, improving the cooling effect of the second coil end. This improves the cooling effect of the second coil end, which in turn improves the cooling effect of the entire coil.

[0018] Therefore, in the rotary machine of the present invention, the amount of resin used in the resin mold can be reduced to reduce costs, while the cooling effect of the coil can be improved.

[0019] It is preferable that the inner peripheral end of the cooling flow passage in the second end outer peripheral facing portion be located closer to the inner peripheral side of the stator core than the outer peripheral end of the stator core.

[0020] In this case, the distance between the cooling flow path and the resin mold between the second coil end and the second end outer periphery facing portion is shortened, so the cooling effect of the second coil end can be further improved.

[0021] The cooling passage preferably extends spirally along the drive shaft centerline from the core outer periphery facing portion to the second end outer periphery facing portion, and the width of the cooling passage in the drive shaft centerline at the second end outer periphery facing portion is preferably smaller than the width of the cooling passage in the core outer periphery facing portion.

[0022] When the inner circumferential end of the cooling flow passage in the second end outer circumferential facing portion is located closer to the inner circumferential side of the stator core than the outer circumferential end of the stator core, the cooling flow passage in the second end outer circumferential facing portion may be longer in the transverse direction, which is perpendicular to the drive shaft direction, than the cooling flow passage in the core outer circumferential facing portion. As the length of the cooling flow passage in the transverse direction increases, the cross-sectional area of ​​the cooling flow passage increases accordingly. The increased cross-sectional area of ​​the cooling flow passage reduces the flow rate of the coolant flowing through the cooling flow passage, thereby reducing the cooling effect of the coolant. Therefore, when the inner circumferential end of the cooling flow passage in the second end outer circumferential facing portion is located closer to the inner circumferential side of the stator core than the outer circumferential end of the stator core, the cooling effect of the coolant flowing through the cooling flow passage in the second end outer circumferential facing portion may be lower than the cooling effect of the coolant flowing through the cooling flow passage in the core outer circumferential facing portion.

[0023] In this regard, if the width of the cooling flow passage in the drive axis direction is reduced, the flow passage cross-sectional area of ​​the cooling flow passage is reduced accordingly. Therefore, even if the inner peripheral end of the cooling flow passage in the second end outer peripheral facing portion is located more inward than the outer peripheral end of the stator core, as long as the width of the cooling flow passage in the drive axis direction in the second end outer peripheral facing portion is smaller than the width of the cooling flow passage in the drive axis direction in the core outer peripheral facing portion, it is possible to prevent a decrease in the cooling effect due to an increase in the flow passage cross-sectional area.

[0024] outside It is preferable that the side housing also form a cooling flow passage between itself and the second end axially opposing portion. stomach.

[0025] In this case, the end face of the resin mold covering the second coil end in the drive shaft direction abuts the end face of the motor housing on the second coil end side at the axially opposed portion of the second end. Therefore, heat transferred from the second coil end to the resin mold also travels in the drive shaft direction and is transferred directly to the motor housing. The heat transferred to the motor housing is absorbed by the coolant flowing through the cooling flow path at the axially opposed portion of the second end. This allows the second coil end to be cooled even more effectively.

[0026] The present invention 1st The electric compressor includes the rotary machine of the present invention, a housing including the motor housing and the outer housing; the drive shaft has one end extending to one side of the drive shaft center and another end extending to the other side, with the rotor sandwiched therebetween; the first coil end is disposed on one end side of the drive shaft within the housing, the second coil end is disposed on the other end side of the drive shaft within the housing, a first compression unit provided in the housing and connected to the one end, the first compression unit compressing fluid drawn into the housing by rotation of the drive shaft; and a second compression section that is provided within the housing and connected to the other end, and that further compresses the fluid compressed in the first compression section as the drive shaft rotates. A second electric compressor of the present invention includes a cylindrical motor housing, a drive shaft provided in the motor housing and rotatable about a drive axis; an electric motor provided in the motor housing and configured to rotate the drive shaft, the electric motor includes a stator and a rotor disposed within the stator and to which the drive shaft is fixed; The stator includes a cylindrical stator core fixed to an inner peripheral surface of the motor housing and a coil wound around the stator core, The coil has a first coil end that protrudes from one side of the stator core and a second coil end that protrudes from the other side of the stator core, the motor housing has a core outer periphery facing portion to which the stator core is fixed, a first end outer periphery facing portion facing the outer periphery of the first coil end, and a second end outer periphery facing portion facing the outer periphery of the second coil end, the rotary machine has a heat-conductive resin mold that covers the first coil end and the second coil end and abuts against the first end outer circumferential facing portion and the second end outer circumferential facing portion, a cooling flow path through which a coolant for cooling the stator is supplied is formed between the first end outer periphery facing portion, the core outer periphery facing portion, the second end outer periphery facing portion, and an outer housing provided outside the motor housing; an inner diameter of the second end outer periphery facing portion is smaller than that of the core outer periphery facing portion and the first end outer periphery facing portion; a housing including the motor housing and the outer housing; the drive shaft has one end extending to one side of the drive shaft center and another end extending to the other side, with the rotor sandwiched therebetween; the first coil end is disposed on one end side of the drive shaft within the housing, the second coil end is disposed on the other end side of the drive shaft within the housing, a first compression unit provided in the housing and connected to the one end, the first compression unit compressing fluid drawn into the housing by rotation of the drive shaft; and a second compression section that is provided within the housing and connected to the other end, and that further compresses the fluid compressed in the first compression section as the drive shaft rotates.

[0027] The present invention First and second In an electric compressor, fluid compressed in the first compression section is further compressed in the second compressor. As a result, the second compression section within the housing becomes hotter than the first compression section. As a result, the second coil end located on the second compression section side in the drive shaft direction is more likely to become hotter than the first coil end located on the first compression section side. Rera In the electric compressor, the second coil end can be cooled effectively, and therefore the coil can be cooled effectively. [Effects of the Invention]

[0028] The rotary machine of the present invention can reduce the amount of resin used in the resin mold to reduce costs, while improving the cooling effect of the coil.

[0029] The electric compressor of the present invention includes the rotary machine of the present invention, and therefore can reduce the amount of resin used in the resin mold to reduce costs, while improving the cooling effect of the coil. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a cross-sectional view of a turbo-fluid machine including a rotary machine according to an embodiment. [Figure 2] FIG. 2 is an enlarged partial cross-sectional view of a turbo-fluid machine including a rotary machine according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. The turbo fluid machine of the embodiment is an example of a specific embodiment of the electric compressor of the present invention. This turbo fluid machine includes a rotary machine 100, which is an example of a specific embodiment of the rotary machine of the present invention. This turbo fluid machine is mounted on a fuel cell vehicle and is connected to a fuel cell stack. The fuel cell vehicle and fuel cell stack are not shown in the drawings.

[0032] As shown in FIGS. 1 and 2, the turbo fluid machine of the embodiment includes a housing 1, an electric motor 3, a drive shaft 5, a first impeller 7, and a second impeller 9.

[0033] In this embodiment, the front-rear direction of the turbo fluid machine is defined by the solid arrows shown in Figures 1 and 2. This front-rear direction is an example of the "drive shaft direction" in the present invention. Note that the turbo fluid machine can change its own attitude as appropriate depending on the vehicle in which it is installed.

[0034] The housing 1 is made of an aluminum alloy and consists of a motor housing 10, a first plate 11, a second plate 12, a third plate 13, a first compressor housing 14, a second compressor housing 15, and an outer housing 16, as shown in FIG.

[0035] The motor housing 10 has an end wall 10a, a first peripheral wall 10b, and a second peripheral wall 10c, and is made of an aluminum alloy.

[0036] The end wall 10a is located at the rear end of the motor housing 10 and extends in the radial direction of the motor housing 10. This radial direction coincides with the axis-perpendicular direction, which is a direction perpendicular to the direction of the drive axis O described below.

[0037] The end wall 10a has a first end surface 101 facing forward and a second end surface 102 facing rearward and located opposite the first end surface 101. The second end surface 102 forms the rear end surface of the motor housing 10.

[0038] The first peripheral wall 10b is integral with the end wall 10a and extends forward from the end wall 10a in a cylindrical shape. The second peripheral wall 10c is integral with the first peripheral wall 10b and extends forward from the first peripheral wall 10b in a cylindrical shape. The first peripheral wall 10b has a smaller diameter than the second peripheral wall 10c. The second peripheral wall 10c is open at the front. The end wall 10a, the first peripheral wall 10b, and the second peripheral wall 10c form the motor housing 10 in a cylindrical shape with a bottom. A flange portion 10d is formed at the front end of the second peripheral wall 10c. The flange portion 10d protrudes radially from the motor housing 10 beyond the outer circumferential surface of the second peripheral wall 10c.

[0039] The inner diameter of the first peripheral wall 10b is smaller than the inner diameter of the second peripheral wall 10c, that is, the outer diameter of a stator core 33, which will be described later.

[0040] The outer housing 16 has an outer housing end wall 16a and an outer housing peripheral wall 16b. The outer housing 16 is made of steel.

[0041] The outer housing end wall 16a is located rearward of the motor housing 10 and extends in the radial direction of the motor housing 10. The outer housing end wall 16a has a first outer housing end face 161 that faces forward and a second outer housing end face 162 that faces rearward and is located opposite the first outer housing end face 161. The second outer housing end face 162 forms the rear end face of the outer housing 16.

[0042] The outer housing peripheral wall 16b is integral with the outer housing end wall 16a and extends forward from the outer housing end wall 16a in a cylindrical shape with a constant inner diameter. The outer housing peripheral wall 16b is open at the front. The outer housing end wall 16a and the outer housing peripheral wall 16b form the outer housing 16 in a cylindrical shape with a bottom.

[0043] The first plate 11 is located in front of the motor housing 10. The first plate 11 has a first front surface 11a located in the front and a first rear surface 11b located in the rear. The first plate 11 is connected to the flange portion 10d and the outer housing 16 with the first rear surface 11b abutting against the flange portion 10d and the outer housing 16. As a result, the first plate 11 closes the openings of the second peripheral wall 10c and the outer housing 16. An O-ring 20 seals the gap between the front end surface of the second peripheral wall 10c and the first rear surface 11b of the first plate 11. In this way, a motor chamber 30 is defined inside the motor housing 10 by the end wall 10a, the first peripheral wall 10b, the second peripheral wall 10c, and the first rear surface 11b.

[0044] A first boss portion 11c, a first recess portion 11d, and a first shaft hole 11e are formed in the first plate 11. The first boss portion 11c protrudes rearward from the first rear surface 11b in a cylindrical shape and extends into the motor chamber 30. A first radial bearing 21a is provided inside the first boss portion 11c.

[0045] The first recess 11d is recessed rearward from the first front surface 11a. A first thrust bearing 23a and a second thrust bearing 23b are provided inside the first recess 11d. The first shaft hole 11e is located in the center of the first plate 11 and penetrates the first plate 11 in the front-to-rear direction. As a result, the first shaft hole 11e communicates with the first recess 11d at its front end and with the first boss portion 11c at its rear end. The first boss portion 11c, the first recess 11d, and the first shaft hole 11e are coaxial with one another.

[0046] The outer housing end wall 16a of the outer housing 16 is formed with a first outer housing boss 16c, a second outer housing boss 16d, and a second shaft hole 16e. The first outer housing boss 16c protrudes forward from the inner circumferential edge of the first outer housing end face 161 in a cylindrical shape and extends into the motor chamber 30. The second outer housing boss 16d protrudes further forward from the first outer housing boss 16c in a cylindrical shape. The second outer housing boss 16d has a smaller diameter than the first outer housing boss 16c. A second radial bearing 21b is provided inside the second outer housing boss 16d. The second shaft hole 16e is located in the center of the outer housing end wall 16a and penetrates the outer housing end wall 16a in the front-rear direction. As a result, the front end of the second shaft hole 16e is in communication with the second outer housing boss 16d. The first outer housing boss portion 16c, the second outer housing boss portion 16d, and the second shaft hole 16e are coaxial with the first boss portion 11c, the first recess portion 11d, and the first shaft hole 11e.

[0047] The second plate 12 is located in front of the first plate 11. The second plate 12 has a second front surface 12a located in the front and a second rear surface 12b located in the rear. The second plate 12 is connected to the first plate 11 with the second rear surface 12b abutting against the first front surface 11a.

[0048] The second plate 12 is formed with a second recess 12c and a third shaft hole 12d. The second recess 12c is recessed rearward from the second front surface 12a. The second recess 12c has a smaller diameter than the first recess 11d. A first seal member 25a is provided inside the second recess 12c. The third shaft hole 12d is located in the center of the second plate 12 and penetrates the second plate 12 in the front-rear direction. As a result, the third shaft hole 12d is connected to the second recess 12c at its front end and to the first recess 11d at its rear end. The second recess 12c and the third shaft hole 12d are coaxial with the first boss portion 11c, the first recess 11d, and the first shaft hole 11e.

[0049] The third plate 13 is located rearward of the outer housing 16. The third plate 13 has a third front surface 13a located forward and a third rear surface 13b located rearward. The third plate 13 is connected to the outer housing 16 with the third front surface 13a abutting against the second outer housing end surface 162 of the outer housing end wall 16a.

[0050] The third plate 13 is formed with a third recess 13c and a fourth shaft hole 13d. The third recess 13c is recessed forward from the third rear surface 13b. The third recess 13c is formed with the same diameter as the second recess 12c. A second seal member 25b is provided inside the third recess 13c. The fourth shaft hole 13d is located in the center of the third plate 13 and penetrates the third plate 13 in the front-to-rear direction. As a result, the fourth shaft hole 13d is connected to the second shaft hole 16e at its front end and to the third recess 13c at its rear end. The third recess 13c and the fourth shaft hole 13d are coaxial with the second outer housing boss portion 16d and the second shaft hole 16e. That is, the third recess 13c and the fourth shaft hole 13d are coaxial with the first boss portion 11c, the first recess 11d, the first shaft hole 11e, the second recess 12c, and the third shaft hole 12d.

[0051] The first compressor housing 14 is located in front of the second plate 12. The first compressor housing 14 is cylindrical and is connected to the second plate 12 while abutting against the second front surface 12a of the second plate 12. As a result, the first compressor housing 14 forms the front end portion of the housing 1. The first compressor housing 14 is also formed with a first intake port 14a and a first discharge port 14b.

[0052] The first suction port 14a is coaxial with the third axial hole 12d and extends in the front-rear direction inside the first compressor housing 14. The front end of the first suction port 14a opens to a front end face 140 of the first compressor housing 14. An suction pipe 17 is connected to the first suction port 14a. Air containing oxygen is drawn into the first suction port 14a from outside the housing 1 through the suction pipe 17. Air is an example of the "fluid" in the present invention.

[0053] The first discharge port 14b extends radially inside the first compressor housing 14 and opens to an outer peripheral surface 141 of the first compressor housing 14. The first discharge port 14b is connected to the communication pipe 8, which will be described later.

[0054] Additionally, a first impeller chamber 27a, a first discharge chamber 27b, and a first diffuser passage 27c are formed between the first compressor housing 14 and the second front surface 12a. The first impeller chamber 27a is in communication with the first suction port 14a. The first discharge chamber 27b extends around the axis of the first suction port 14a around the periphery of the first impeller chamber 27a. The first discharge chamber 27b is in communication with the first discharge port 14b. The first diffuser passage 27c connects the first impeller chamber 27a and the first discharge chamber 27b. As a result, the first impeller chamber 27a is in communication with the first discharge port 14b via the first diffuser passage 27c and the first discharge chamber 27b. The first impeller chamber 27a, the first discharge chamber 27b, the first diffuser passage 27c, and the first impeller 7 are an example of the "first compression section" in the present invention.

[0055] The second compressor housing 15 is located behind the third plate 13. Like the first compressor housing 14, the second compressor housing 15 is also cylindrical. The second compressor housing 15 is connected to the third plate 13 while abutting against the third rear surface 13b of the third plate 13. As a result, the second compressor housing 15 forms the rear end portion of the housing 1. The second compressor housing 15 also has a second intake port 15a and a second discharge port 15b formed therein.

[0056] The second suction port 15a is coaxial with the first suction port 14a and extends in the front-rear direction inside the second compressor housing 15. The rear end of the second suction port 15a opens to a rear end surface 150 of the second compressor housing 15. The second suction port 15a is connected to the communication pipe 8, which will be described later.

[0057] The second discharge port 15b extends radially inside the second compressor housing 15 and opens to the outer peripheral surface 151 of the second compressor housing 15. A discharge pipe 18 is connected to the second discharge port 15b. The turbo fluid machine is connected to the fuel cell stack through the discharge pipe 18.

[0058] Additionally, a second impeller chamber 29a, a second discharge chamber 29b, and a second diffuser passage 29c are formed between the second compressor housing 15 and the third rear surface 13b. The second impeller chamber 29a is in communication with the second suction port 15a. The second discharge chamber 29b extends around the axis of the second suction port 15a around the periphery of the second impeller chamber 29a. The second discharge chamber 29b is in communication with the second discharge port 15b. The second diffuser passage 29c connects the second impeller chamber 29a and the second discharge chamber 29b. As a result, the second impeller chamber 29a is in communication with the second discharge port 15b via the second diffuser passage 29c and the second discharge chamber 29b. The second impeller chamber 29a, the second discharge chamber 29b, the second diffuser passage 29c, and the second impeller 9 are an example of the "second compression section" in the present invention.

[0059] In this manner, in the housing 1, the first impeller chamber 27a and the second impeller chamber 29a are spaced apart in the front-rear direction, and the motor chamber 30 is disposed between the first impeller chamber 27a and the second impeller chamber 29a.

[0060] The electric motor 3 is housed in a motor chamber 30 and rotates a drive shaft 5. The electric motor 3 has a stator 31 and a rotor 32. The stator 31 is fixed to the motor housing 10. The stator 31 is connected to a power supply device (not shown) provided outside the housing 1.

[0061] The stator 31 has a stator core 33 and a coil 34. The stator core 33 is formed to extend cylindrically in the front-rear direction and is fixed to the inner circumferential surface of the motor housing 10. More specifically, an outer circumferential surface 33a of the stator core 33 is fixed to the inner circumferential surface 10e of the second circumferential wall 10c.

[0062] The coil 34 is wound around the stator core 33. The coil 34 has a first coil end 34a that protrudes forward from the stator core 33 and a second coil end 34b that protrudes rearward from the stator core 33.

[0063] In this stator 31, the coils 34 and the gaps between the coils 34 and the stator core 33 are molded with a heat-conductive resin so that the inner circumferential surface 33b of the stator core 33, the front and rear end surfaces of the stator core 33, and the first and second coil ends 34a and 34b are entirely covered with the heat-conductive resin. Thus, the entire outer surface of the first coil end 34a and the front end surface of the stator core 33 are covered with a first resin mold 61. Similarly, the entire outer surface of the second coil end 34b and the rear end surface of the stator core 33 are covered with a second resin mold 62. Furthermore, the inner circumferential surface 33b of the stator core 33 is covered with a third resin mold 63.

[0064] The first resin mold 61, the second resin mold 62, and the third resin mold 63 are integrally formed by resin injection molding. Specifically, the stator 31 is inserted through the opening in the second peripheral wall 10c, and the stator core 33 is press-fitted and fixed to the inner peripheral surface 10e of the motor housing 10. This integrated assembly is then placed in a predetermined mold and resin is injection-molded to form the first resin mold 61, the second resin mold 62, and the third resin mold 63. Resins with high thermal conductivity, such as epoxy resin or polyester resin, may be used for the first resin mold 61, the second resin mold 62, and the third resin mold 63. These resins may also be mixed with powders, such as alumina or silica, that have higher thermal conductivity than resins. The first resin mold 61, the second resin mold 62, and the third resin mold 63 are examples of the "resin mold" defined in the present invention.

[0065] The rotor 32 is formed in a cylindrical shape extending in the front-rear direction and having a smaller diameter than the stator 31. The rotor 32 is disposed inside the stator 31. The drive shaft 5 is fixed to the rotor 32.

[0066] The drive shaft 5 is formed in a cylindrical shape extending axially, i.e., in the front-to-rear direction, and has, from front to rear, a first shaft portion 5a, a second shaft portion 5b, a third shaft portion 5c, a fourth shaft portion 5d, and a fifth shaft portion 5e. The first shaft portion 5a and the fifth shaft portion 5e have the same diameter and are formed to be the smallest diameter on the drive shaft 5. The second shaft portion 5b and the fourth shaft portion 5d have the same diameter and are formed to be larger than the first and fifth shaft portions 5a and 5e. The second shaft portion 5b is connected to the first shaft portion 5a at its front end. The fourth shaft portion 5d is connected to the fifth shaft portion 5e at its rear end. The third shaft portion 5c is formed to be the largest diameter on the drive shaft 5. The third shaft portion 5c is connected to the second shaft portion 5b at its front end and to the fourth shaft portion 5d at its rear end.

[0067] The drive shaft 5 is inserted into the housing 1 and is rotatable around a drive axis O. The first shaft portion 5a of the drive shaft 5 extends into the first impeller chamber 27a. The drive axis O extends parallel to the front-rear direction of the turbo fluid machine.

[0068] The second shaft portion 5b is inserted through the third shaft hole 12d and the first shaft hole 11e, and extends into the second recess 12c and the first recess 11d. The second shaft portion 5b is inserted through the first seal member 25a in the second recess 12c. The first seal member 25a seals the gap between the first impeller chamber 27a and the first recess 11d and the motor chamber 30. The second shaft portion 5b is inserted through the first and second thrust bearings 23a and 23b in the first recess 11d, and is press-fitted into a support plate 51. The support plate 51 is located between the first thrust bearing 23a and the second thrust bearing 23b. As a result, the support plate 51 sandwiches the first thrust bearing 23a in the front-rear direction between itself and the second rear surface 12b, and sandwiches the second thrust bearing 23b in the front-rear direction between itself and the wall surface of the first recess 11d.

[0069] The third shaft portion 5c extends into the motor chamber 30, and is inserted into and fixed to the rotor 32. The third shaft portion 5c is supported by the first radial bearing 21a in the first boss portion 11c, and is supported by the second radial bearing 21b in the second outer housing boss portion 16d.

[0070] The fourth shaft portion 5d is inserted through the second shaft hole 16e and the fourth shaft hole 13d and extends into the third recess 13c. The fourth shaft portion 5d is also inserted through the second seal member 25b in the third recess 13c. This allows the second seal member 25b to seal between the second impeller chamber 29a and the motor chamber 30. The fifth shaft portion 5e extends into the second impeller chamber 29a.

[0071] The motor housing 10, the first plate 11, the drive shaft 5, the electric motor 3, the first resin mold 61, the second resin mold 6, and the like constitute a rotating machine 100.

[0072] The first impeller 7 is housed in the first impeller chamber 27a. The first impeller 7 is formed in a generally conical shape with a diameter that gradually increases from the front to the rear. On the other hand, the second impeller 9 is housed in the second impeller chamber 29a. The second impeller 9 has a shape that is symmetrical to the first impeller 7 in the front-to-rear direction. In other words, the second impeller 9 is formed in a generally conical shape with a diameter that gradually decreases from the front to the rear. The first impeller 7 is made of an aluminum alloy, and the second impeller 9 is made of steel.

[0073] The first impeller 7 is fixed to the first shaft portion 5a of the drive shaft 5. The second impeller 9 is fixed to the fifth shaft portion 5e of the drive shaft 5. In this way, the drive shaft 5 connects the first and second impellers 7 and 9 to the electric motor 3. The first discharge chamber 14b and the second suction port 15a are communicated with each other by a connecting pipe 8. The first shaft portion 5a is an example of the "first end" in the present invention. The fifth shaft portion 5e is an example of the "second end" in the present invention.

[0074] The motor housing 10 has a core outer periphery facing portion 41, to which the stator core 33 is fixed, facing the outer periphery of the stator core 33, a first end outer periphery facing portion 42 facing the outer periphery of the first coil end 34a, a second end outer periphery facing portion 43 facing the outer periphery of the second coil end 34b, and a second end axial direction facing portion 44 facing the second coil end 34b in the direction of the drive axis O. The area of ​​the second circumferential wall 10c that corresponds to the outer periphery of the stator core 33 corresponds to the core outer periphery facing portion 41. The area of ​​the second circumferential wall 10c other than the core outer periphery facing portion 41 corresponds to the first end outer periphery facing portion 42. The first circumferential wall 10b corresponds to the second end outer periphery facing portion 43. The end wall 10a corresponds to the second end axial direction facing portion 44. Therefore, the core outer periphery facing portion 41 and the first end outer periphery facing portion 42 have the same inner diameter. The second end outer periphery facing portion 43 has smaller inner and outer diameters than the core outer periphery facing portion 41.

[0075] A spiral groove 81 is provided on the outer circumferential surface of the first peripheral wall 10b and in a region of the second peripheral wall 10c other than the flange portion 10d. The spiral groove 81 extends spirally along the drive axis O through the region of the first end outer periphery facing portion 42, the region of the core outer periphery facing portion 41, and the region of the second end outer periphery facing portion 43.

[0076] A spiral groove 82 is provided in the second end surface 102 of the end wall 10a. The spiral groove 82 extends spirally from the outer peripheral end to the inner peripheral end of the end wall 10a around the drive axis O. The rear end of the spiral groove 81 and the outer peripheral end of the spiral groove 82 are in communication.

[0077] The outside of the motor housing 10 is surrounded by an outer housing 16. The outer peripheral surface of the flange portion 10d abuts against the inner peripheral surface of the outer housing peripheral wall 16b, and the inner peripheral end face of the end wall 10a abuts against the outer peripheral surface of the first outer housing boss portion 16c. An O-ring 21 seals the gap between the outer peripheral surface of the flange portion 10d and the inner peripheral surface of the outer housing peripheral wall 16b. An O-ring 22 seals the gap between the inner peripheral end face of the end wall 10a and the outer peripheral surface of the first outer housing boss portion 16c.

[0078] Thus, a cooling flow passage 80 is formed between the outer housing 16 and the outside of the motor housing 10. The cooling flow passage 80 extends spirally along the drive axis O through the region of the first end outer periphery facing portion 42, the region of the core outer periphery facing portion 41, and the region of the second end outer periphery facing portion 43. The cooling flow passage 80 also extends spirally around the drive axis O from the outer periphery end of the end wall 10a toward the inner periphery end. The cooling flow passage 80 includes a first end flow passage portion 80a provided in the region of the first end outer periphery facing portion 42, a core flow passage portion 80b provided in the region of the core outer periphery facing portion 41, a second end flow passage portion 80c provided in the region of the second end outer periphery facing portion 43, and a spiral flow passage portion 80d provided in the region of the second end axially facing portion 44. The first end channel portion 80a and the core channel portion 80b communicate with each other, the core channel portion 80b and the second end channel portion 80c communicate with each other, and the second end channel portion 80c and the spiral channel portion 80d communicate with each other.

[0079] Cooling water for cooling the stator 31 is supplied to the cooling flow passage 80. The cooling water is an example of the "coolant" in the present invention. The outer housing 16 is provided with a water supply / drain port and a water supply / drain passage (not shown) for supplying and discharging cooling water to and from the cooling flow passage 80. The water supply passage is connected to the front end of the first end flow passage portion 80a of the cooling flow passage 80. The drain passage is connected to the inner peripheral end of the spiral flow passage portion 80d of the cooling flow passage 80. The water supply port is supplied with cooling water from a water supply device (not shown) provided outside the housing 1.

[0080] As described above, the second end outer periphery facing portion 43 of the motor housing 10 has smaller inner and outer diameters than the core outer periphery facing portion 41. In other words, the inner diameter of the second end outer periphery facing portion 43 is smaller than the outer diameter of the stator core 33.

[0081] The outer peripheral surface 61a of the first resin mold 61 abuts against the inner peripheral surface 10e of the motor housing 10 at the first end outer peripheral facing portion 42. The front end surface 61b of the first resin mold 61 abuts against the first rear surface 11b of the first plate 11. Similarly, the outer peripheral surface 62a of the second resin mold 62 abuts against the inner peripheral surface 10f of the motor housing 10 at the second end outer peripheral facing portion 43. The rear end surface 62b of the second resin mold 62 abuts against the first end surface 101 of the end wall 10a.

[0082] Here, assume a flow passage axial cross section of the cooling flow passage 80 taken along a plane including the drive axis O. As shown in FIG. 2 , in this flow passage axial cross section, the cooling flow passage 80 has a substantially rectangular shape. In addition, in the flow passage axial cross section, the inner peripheral end of the second end flow passage portion 80c in the second end outer periphery facing portion 43 is located closer to the inner peripheral side of the motor housing 10 than the inner peripheral end of the core flow passage portion 80b in the core outer periphery facing portion 41. Furthermore, in the flow passage axial cross section, the inner peripheral end of the second end flow passage portion 80c in the second end outer periphery facing portion 43 is located closer to the inner peripheral side of the stator core 33 than the outer peripheral surface 33a, which is the outer peripheral end of the stator core 33.

[0083] In addition, in the cross section in the flow path axial direction, the width d1 in the direction of the drive axis O of the second end flow path section 80c at the second end outer periphery opposing part 43 is smaller than the width d2 in the direction of the drive axis O of the core flow path section 80b at the core outer periphery opposing part 41. In addition, in the cross section in the flow path axial direction, the length of the second end flow path section 80c in the direction perpendicular to the axis is longer than the length of the core flow path section 80b in the direction perpendicular to the axis.

[0084] In the turbo fluid machine configured as described above, when electricity is supplied from the power supply device to the electric motor 3 shown in Fig. 1, the electric motor 3 is operated and the drive shaft 5 rotates around the drive axis O. As a result, the first impeller 7 rotates around the drive axis O in the first impeller chamber 27a, and the second impeller 9 rotates around the drive axis O in the second impeller chamber 29a.

[0085] As a result, in this turbo fluid machine, air drawn in through the first suction port 14a is compressed in two stages by the first impeller 7 and the second impeller 9. That is, the air drawn in through the first suction port 14a is compressed by the first impeller 7 in the first impeller chamber 27a to become first compressed air, which is then discharged to the first discharge chamber 27b. This first compressed air is at a higher temperature and pressure than the air drawn into the first impeller chamber 27a. The first compressed air discharged from the first discharge chamber 27 to the connecting pipe 8 is then supplied from the second suction port 15a into the second impeller chamber 29a. The first compressed air supplied to the second impeller chamber 29a is further compressed by the second impeller 9 to become second compressed air, which is then discharged to the second discharge chamber 29b. This second compressed air is at a higher temperature and pressure than the first compressed air. This second compressed air is then discharged from the second discharge port 15b into the discharge pipe 18, and is supplied to the cathode of the fuel cell stack through the discharge pipe 18.

[0086] During operation of this turbo fluid machine, cooling water is supplied from a water supply device to the water supply port. The cooling water supplied to the water supply port flows into the cooling flow path 80 via the water supply flow path, and after flowing through the cooling flow path 80, is discharged to the outside of the housing 1 from the drain port via the drain flow path.

[0087] In the rotating machine 100 of this embodiment, the outer peripheral surface 61a of the heat-conductive first resin mold 61 covering the first coil end 34a abuts against the inner peripheral surface 10e of the motor housing 10 at the first-end outer peripheral facing portion 42. Similarly, the outer peripheral surface 62a of the heat-conductive second resin mold 62 covering the second coil end 34b abuts against the inner peripheral surface 10f of the motor housing 10 at the second-end outer peripheral facing portion 43. Therefore, heat transferred from the first coil end 34a to the first resin mold 61 is transferred directly to the first-end outer peripheral facing portion 42 of the motor housing 10 without passing through the stator core 33. Similarly, heat transferred from the second coil end 34b to the second resin mold 62 is transferred directly to the second-end outer peripheral facing portion 43 of the motor housing 10 without passing through the stator core 33. Furthermore, heat transferred from the second coil end 34b to the second resin mold 62 is transferred directly to the second end axially facing portion 44 of the motor housing 10. Heat from the stator core 33 is transferred directly from the stator core 33 to the core outer periphery facing portion 41 of the motor housing 10. The heat transferred to the motor housing 10 is removed by the cooling water flowing through the cooling passages 80 in the first end outer periphery facing portion 42, the core outer periphery facing portion 41, the second end outer periphery facing portion 43, and the second end axially facing portion 44. In other words, the heat transferred to the motor housing 10 is removed by the cooling water flowing through the first end passage portion 80a, the core passage portion 80b, the second end passage portion 80c, and the spiral passage portion 80d. In this way, the stator 31 can be effectively cooled by the cooling water flowing through the cooling passages 80.

[0088] In particular, in this rotating machine 100, heat is transferred from the rear end surface 62b of the second resin mold 62 to the end wall 10a of the motor housing 10 in the direction of the drive shaft O, and the heat transferred to the end wall 10a is absorbed by the cooling water flowing through the spiral flow path 80d, thereby allowing the second coil end 34b to be cooled even more effectively.

[0089] In the rotating machine 100, the inner diameter of the second end outer periphery facing portion 43 of the motor housing 10 is smaller than the inner diameter of the core outer periphery facing portion 41. The inner periphery 10f of the motor housing 10 at the second end outer periphery facing portion 43 is in contact with the outer periphery 62a of the second resin mold 62 that covers the outer periphery of the second coil end 34b.

[0090] In this case, the amount of resin used in second resin mold 62 can be reduced by the amount that the inner diameter of second end outer periphery opposing portion 43 is reduced.

[0091] Furthermore, the heat transfer distance from the second coil end 34b in the second resin mold 62 to the motor housing 10 is shortened by the amount of the reduced inner diameter of the second end outer periphery facing portion 43. A shorter heat transfer distance in the second resin mold 62 facilitates heat transfer from the second coil end 34b to the second end outer periphery facing portion 43 of the motor housing 10 via the second resin mold 62, thereby improving the cooling effect of the second coil end 34b. An improved cooling effect of the second coil end 34b also improves the cooling effect of the entire coil 34.

[0092] Therefore, in the rotary machine 100 of this embodiment and the turbo fluid machine of this embodiment equipped with this rotary machine 100, the amount of resin used in the resin mold can be reduced to reduce costs, while the cooling effect of the coil 34 can be improved.

[0093] Furthermore, in this turbo fluid machine, the air compressed by the first impeller 7 is further compressed by the second impeller 9. For this reason, within the housing 1, the temperature around the second impeller 9 becomes higher than the temperature around the first impeller 7. As a result, in the direction of the drive axis O, the second coil end 34b located on the second impeller 9 side is more likely to become higher in temperature than the first coil end 34a located on the first impeller 7 side.

[0094] In this regard, in this turbo fluid machine, the second coil end 34b can be cooled more effectively, and therefore the entire coil 34 can be cooled more effectively.

[0095] In particular, in this rotary machine 100, in a cross section along the flow path axis, the inner peripheral end of the cooling flow path 80 in the second end outer peripheral opposing portion 43, i.e., the inner peripheral end of the second end flow path portion 80c, is located closer to the inner peripheral side of the stator core 33 than the outer peripheral surface 33a, which is the outer peripheral end of the stator core 33.

[0096] This configuration shortens the distance between the second end flow path section 80c and the second resin mold 62, thereby further improving the cooling effect on the second coil end 34b.

[0097] In the rotary machine 100, in the cross section along the flow path axis, the inner peripheral end of the second end flow path section 80c in the second outer peripheral facing portion 43 is located closer to the inner peripheral side of the stator core 33 than the outer peripheral surface 33a of the stator core 33, and the length of the second end flow path section 80c in the direction perpendicular to the axis is longer than the length of the core flow path section 80b in the direction perpendicular to the axis. In this case, if the width d1 of the second end flow path section 80c in the direction of the drive axis O and the width d2 of the core flow path section 80b in the direction of the drive axis O are the same in the cross section along the flow path axis, the flow path cross-sectional area of ​​the second end flow path section 80c is larger than the flow path cross-sectional area of ​​the core flow path section 80b by the amount of the longer length along the direction perpendicular to the axis. As a result, the flow velocity of the coolant flowing through the second end flow path section 80c decreases, and the cooling effect in the second end flow path section 80c decreases.

[0098] In this regard, in the rotary machine 100, the width d1 of the second end flow path section 80c is smaller than the width d2 of the core flow path section 80b, and therefore the flow path cross-sectional area of ​​the second end flow path section 80c is reduced accordingly. Therefore, even if the inner peripheral end of the second end flow path section 80c is brought closer to the outer peripheral surface 62a of the second resin mold 62 to increase the length of the second end flow path section 80c in the direction perpendicular to the axis in order to further improve the cooling effect of the second coil end 34b, it is possible to prevent a decrease in the cooling effect due to an increase in the flow path cross-sectional area.

[0099] In addition, in this rotating machine 100, the stator 31 has the outer peripheral surface 33a of the stator core 33 press-fitted into the inner peripheral surface 10e of the motor housing 10, the inner peripheral surface 33b of the stator core 33 covered with the third resin mold 63, the first coil ends 34a covered with the first resin mold 61, and the second coil ends 34b covered with the second resin mold 62. That is, in the stator 31, the outer surfaces other than the outer peripheral surface 33a of the stator core 33 that abuts against the inner peripheral surface 10e of the motor housing 10 are covered by the integrated first resin mold 61, second resin mold 62, and third resin mold 63. This provides the stator 31 with high sealing performance and corrosion resistance.

[0100] Although the present invention has been described above with reference to the examples, it goes without saying that the present invention is not limited to the above examples and can be modified and applied as appropriate within the scope of the invention.

[0101] In the embodiment, the inner peripheral end of the second end flow passage portion 80c at the second end outer periphery facing portion 43 is located closer to the inner peripheral side of the stator core 33 than the outer periphery 33a of the stator core 33 in the cross section in the flow passage axial direction, but the present invention is not limited to this configuration. For example, in the cross section in the flow passage axial direction, the inner peripheral end of the second end flow passage portion 80c may be located between the inner peripheral end of the core flow passage portion 80b at the core outer periphery facing portion 41 and the outer periphery 33a of the stator core 33, or may be located at the same position in the radial direction of the motor housing 10 as the inner peripheral end of the core flow passage portion 80b. The key is that the inner diameter of the motor housing 10 at the second end outer periphery facing portion 43 is smaller than the inner diameter of the motor housing 10 at the core outer periphery facing portion 41.

[0102] In the embodiment, the outer housing peripheral wall 16b of the outer housing 16 has a constant inner diameter and extends cylindrically in the front-rear direction, but the present invention is not limited to this configuration. For example, the inner diameter of the portion of the outer housing peripheral wall 16b corresponding to the second end outer periphery facing portion 43 may be smaller than the inner diameter of the portion corresponding to the core outer periphery facing portion 41.

[0103] In the embodiment, a turbo fluid machine is provided with the rotary machine 100, but the rotary machine of the present invention may be applied to an air conditioning compressor, a turbine, a generator, a blower, or the like.

[0104] In the turbo fluid machine of the embodiment, the "fluid" in the present invention is air, but the "fluid" is not limited to this and may be a refrigerant used in air conditioning, etc. Furthermore, the "coolant" in the present invention may be a cooling liquid other than cooling water.

[0105] (Appendix 1) A cylindrical motor housing; a drive shaft provided in the motor housing and rotatable about a drive axis; an electric motor provided in the motor housing and configured to rotate the drive shaft, the electric motor includes a stator and a rotor disposed within the stator and to which the drive shaft is fixed; The stator includes a cylindrical stator core fixed to an inner peripheral surface of the motor housing and a coil wound around the stator core, The coil has a first coil end that protrudes from one side of the stator core and a second coil end that protrudes from the other side of the stator core, the motor housing has a core outer periphery facing portion to which the stator core is fixed, a first end outer periphery facing portion facing the outer periphery of the first coil end, and a second end outer periphery facing portion facing the outer periphery of the second coil end, the rotary machine has a heat-conductive resin mold that covers the first coil end and the second coil end and abuts against the first end outer circumferential facing portion and the second end outer circumferential facing portion, a cooling flow path through which a coolant for cooling the stator is supplied is formed between the first end outer periphery facing portion, the core outer periphery facing portion, the second end outer periphery facing portion, and an outer housing provided outside the motor housing; The rotary machine is characterized in that the second end outer periphery facing portion has an inner diameter smaller than that of the core outer periphery facing portion. (Appendix 2) 2. The rotary machine according to claim 1, wherein an inner peripheral end of the cooling flow passage in the second end outer peripheral facing portion is located closer to the inner peripheral side of the stator core than an outer peripheral end of the stator core. (Appendix 3) the cooling flow path is provided to extend spirally along the drive shaft center direction across the region of the core outer periphery facing portion and the region of the second end outer periphery facing portion, 3. The rotary machine according to claim 2, wherein the width of the cooling flow passage in the drive shaft direction at the second end outer periphery facing portion is smaller than the width of the cooling flow passage in the drive shaft direction at the core outer periphery facing portion. (Appendix 4) the motor housing further includes a second end axially opposing portion that faces the second coil end in the drive shaft direction, the outer housing also defines the cooling flow path between itself and the second end axially opposed portion, 4. The rotary machine according to claim 1, wherein the second end axially opposing portion and the resin mold are in contact with each other. (Appendix 5) An electric compressor including the rotary machine according to any one of appendixes 1 to 4, a housing including the motor housing and the outer housing; the drive shaft has one end extending to one side of the drive shaft center and another end extending to the other side, with the rotor sandwiched therebetween; the first coil end is disposed on one end side of the drive shaft within the housing, the second coil end is disposed on the other end side of the drive shaft within the housing, a first compression unit provided in the housing and connected to the one end, the first compression unit compressing fluid drawn into the housing by rotation of the drive shaft; a second compression section that is provided within the housing and connected to the other end, and that further compresses the fluid compressed in the first compression section as the drive shaft rotates. [Industrial Applicability]

[0106] The present invention can be used in fuel cell systems, air conditioners, and the like. [Explanation of symbols]

[0107] 1. Housing 3...Electric motor 5...Drive shaft 5a...First shaft part (first end part) 5e...Fifth shaft part (second end) 7...First impeller (first compression section) 9...Second impeller (second compression section) 10...Motor housing 16...Outer housing 27a...First impeller chamber (first compression section) 29a...Second impeller chamber (second compression section) 31...Stator 32...Rotor 33... Stator core 34...Coil 34a...1st coil end 34b...Second coil end 41...Core outer periphery facing portion 42...First end outer periphery facing portion 43...Second end outer periphery facing part 44...Second end axially opposing portion 61...First resin mold (resin mold) 62...Second resin mold (resin mold) 80...Cooling channel 100...Rotating machines

Claims

1. A cylindrical motor housing; a drive shaft provided in the motor housing and rotatable about a drive axis; an electric motor provided in the motor housing and configured to rotate the drive shaft, the motor housing has a motor chamber that accommodates the drive shaft and the electric motor, the electric motor includes a stator and a rotor disposed within the stator and to which the drive shaft is fixed; The stator includes a cylindrical stator core fixed to an inner peripheral surface of the motor housing and a coil wound around the stator core, The coil has a first coil end that protrudes from one side of the stator core and a second coil end that protrudes from the other side of the stator core, the motor housing has a core outer periphery facing portion to which the stator core is fixed, a first end outer periphery facing portion facing the outer periphery of the first coil end, and a second end outer periphery facing portion facing the outer periphery of the second coil end, the rotating machine has a heat-conductive resin mold that covers the first coil end and the second coil end and abuts against the first end outer circumferential facing portion and the second end outer circumferential facing portion, a cooling flow path through which a coolant for cooling the stator is supplied is formed between the first end outer periphery facing portion, the core outer periphery facing portion, the second end outer periphery facing portion, and an outer housing provided outside the motor housing, the second end outer periphery facing portion has an inner diameter smaller than that of the core outer periphery facing portion, the motor chamber has a first chamber defined by the first coil end, a first stator core end face of the stator core facing one side in the drive shaft direction, a first end axially opposing portion opposing the first coil end and the first stator core end face in the drive shaft direction, and the first end outer peripheral opposing portion; and a second chamber defined by the second coil end, a second stator core end face of the stator core facing the other side in the drive shaft direction, a second end axially opposing portion opposing the second coil end and the second stator core end face in the drive shaft direction, and the second end outer peripheral opposing portion, The resin mold has a first resin mold that is filled in the first chamber and covers the entire outer surface of the first coil end and the end face of the first stator core, and a second resin mold that is filled in the second chamber and covers the entire outer surface of the second coil end and the end face of the second stator core.

2. The rotary machine according to claim 1 , wherein an inner peripheral end of the cooling flow passage in the second end outer peripheral facing portion is located closer to the inner peripheral side of the stator core than an outer peripheral end of the stator core.

3. the cooling flow path is provided to extend spirally along the drive shaft center direction across the region of the core outer periphery facing portion and the region of the second end outer periphery facing portion, The rotary machine according to claim 2 , wherein the width of the cooling flow passage in the second end outer periphery facing portion in the drive shaft center direction is smaller than the width of the cooling flow passage in the core outer periphery facing portion in the drive shaft center direction.

4. A rotary machine as described in claim 2, wherein the outer housing also forms the cooling flow path between itself and the second end axially opposing portion.

5. An electric compressor including the rotary machine according to any one of claims 1 to 4, a housing including the motor housing and the outer housing; the drive shaft has one end extending to one side of the drive shaft center and another end extending to the other side, with the rotor sandwiched therebetween; the first coil end is disposed on one end side of the drive shaft within the housing, the second coil end is disposed on the other end side of the drive shaft within the housing, a first compression unit provided in the housing and connected to the one end, the first compression unit compressing fluid drawn into the housing by rotation of the drive shaft; a second compression section provided within the housing and connected to the other end, the second compression section further compressing the fluid compressed in the first compression section by rotation of the drive shaft.

6. A cylindrical motor housing; a drive shaft provided in the motor housing and rotatable about a drive axis; an electric motor provided in the motor housing and configured to rotate the drive shaft, the electric motor includes a stator and a rotor disposed within the stator and to which the drive shaft is fixed; The stator includes a cylindrical stator core fixed to an inner peripheral surface of the motor housing and a coil wound around the stator core, The coil has a first coil end that protrudes from one side of the stator core and a second coil end that protrudes from the other side of the stator core, the motor housing has a core outer periphery facing portion to which the stator core is fixed, a first end outer periphery facing portion facing the outer periphery of the first coil end, and a second end outer periphery facing portion facing the outer periphery of the second coil end, the rotating machine has a heat-conductive resin mold that covers the first coil end and the second coil end and abuts against the first end outer circumferential facing portion and the second end outer circumferential facing portion, a cooling flow path through which a coolant for cooling the stator is supplied is formed between the first end outer periphery facing portion, the core outer periphery facing portion, the second end outer periphery facing portion, and an outer housing provided outside the motor housing, an inner diameter of the second end outer peripheral facing portion is smaller than an inner diameter of the core outer peripheral facing portion and an inner diameter of the first end outer peripheral facing portion; a housing including the motor housing and the outer housing; the drive shaft has one end extending to one side of the drive shaft center and another end extending to the other side, with the rotor sandwiched therebetween; the first coil end is disposed on one end side of the drive shaft within the housing, the second coil end is disposed on the other end side of the drive shaft within the housing, a first compression unit provided in the housing and connected to the one end, the first compression unit compressing fluid drawn into the housing by rotation of the drive shaft; a second compression section provided within the housing and connected to the other end, the second compression section further compressing the fluid compressed in the first compression section by rotation of the drive shaft.

7. An electric compressor as described in Claim 6, wherein the inner end of the cooling flow path at the second end outer peripheral opposing portion is located closer to the inner side of the stator core than the outer peripheral end of the stator core.

8. The cooling flow path is provided so as to extend spirally along the drive shaft center direction across the area of ​​the core outer periphery facing portion and the area of ​​the second end outer periphery facing portion, 8. The electric compressor according to claim 7, wherein the width of the cooling flow passage in the second end outer periphery facing portion in the drive shaft center direction is smaller than the width of the cooling flow passage in the core outer periphery facing portion in the drive shaft center direction.

9. The motor housing further has a second end axially opposing portion that faces the second coil end in the drive axial direction, the outer housing also defines the cooling flow passage between itself and the second end axially opposed portion, 8. The electric compressor according to claim 7, wherein the second end axially opposing portion and the resin mold are in contact with each other.

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