Rotating electrical machine and rotating electrical machine cooling system

Abstract

This rotating electrical machine makes it possible to obtain high energy convertability even when the temperature of the interior of the rotating electrical machine is elevated.　This invention is provided with a frame (10), a rotor (11), and a stator (13). The rotor (11) and the stator (13) are stored in the interior of the frame (10). The frame (10) is provided with: a refrigerant supply port (15) through which liquefied gas having a temperature of 120K or below and obtained by liquefying fuel gas is supplied as a refrigerant (30); and a refrigerant discharge port (16) for outputting partially or completely vaporized refrigerant (30) to a fuel gas utilization device. The stator (13) is cooled by the refrigerant (30) that is the liquefied gas at 120K or below. The fuel gas is hydrogen gas or liquefied natural gas.

Description

Rotating electric machine and rotating electric machine cooling system

[0001] The present disclosure relates to a rotating electric machine and a cooling system for the rotating electric machine.

[0002] In conventional rotating electrical machines, for example, gaseous hydrogen is used to cool the rotor and the stator (see, for example, Patent Documents 1 and 2).

[0003] International Publication No. 2018 / 142669 JP 3-155350

[0004] In conventional rotating electric machines, the rotor and stator were cooled using gaseous hydrogen, which limited the cooling capacity. As a result, when the temperature inside the rotating electric machine rose, the energy conversion capacity of the rotating electric machine was limited, and if the rotating electric machine was a generator, the power generation capacity was also limited.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a rotating electric machine and a rotating electric machine cooling system that can obtain high energy conversion capacity even when the internal temperature of the rotating electric machine rises.

[0006] The rotating electric machine of the present disclosure comprises a frame, a rotor, and a stator, the rotor and the stator being housed inside the frame, the frame comprising a refrigerant supply port through which a liquefied gas having a temperature of 120 K or less, obtained by liquefying a fuel gas, is supplied as a refrigerant, and a refrigerant discharge port through which the partially or completely vaporized refrigerant is output to a fuel gas utilization device, the stator being cooled by the refrigerant which is a liquefied gas having a temperature of 120 K or less, and the fuel gas being hydrogen gas or liquefied natural gas.

[0007] The rotating electric machine of the present disclosure comprises a frame, a rotor, and a stator, the rotor and stator being stored inside the frame, the frame having a refrigerant supply port through which a liquefied gas having a temperature of 120 K or less is supplied as a refrigerant, which is a liquefied fuel gas, and a refrigerant discharge port through which the partially or fully vaporized refrigerant is output to a fuel gas utilization device, and the stator is cooled by the refrigerant which is a liquefied gas of 120 K or less, and the fuel gas is hydrogen gas or liquefied natural gas, so that high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0008] FIG. 1 is a diagram showing the configuration of a rotating electric machine according to embodiment 1. FIG. 2 is a diagram showing the configuration of a modified example of the rotating electric machine according to embodiment 1. FIG. 3 is a diagram showing the configuration of a further modified example of the rotating electric machine according to embodiment 1. FIG. 4 is a diagram showing the configuration of a rotating electric machine according to embodiment 2. FIG. 5 is a diagram showing the configuration of a rotating electric machine of a comparative example. FIG. 6 is a diagram showing the configuration of a modified example of the rotating electric machine according to embodiment 2. FIG. 7 is a diagram showing the configuration of a rotating electric machine cooling system according to embodiment 5. FIG. 8 is a diagram showing a schematic configuration of a rotating electric machine cooling system according to embodiment 5.

[0009] Hereinafter, a rotating electric machine and a cooling system for the rotating electric machine according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the same reference numerals in the various drawings indicate the same or corresponding parts.

[0010] Embodiment 1. Figure 1 is a diagram showing the configuration of a rotating electric machine according to embodiment 1. A rotating electric machine 100 according to embodiment 1 includes a frame 10, a rotor 11, a shaft 12, a stator 13, a gas heat exchanger 14, a liquefied gas tank 20, and a coolant heat exchanger 21. In Figure 1, the frame 10, the rotor 11, the shaft 12, and the stator 13 are shown in schematic cross section. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10.

[0011] The frame 10 includes a gas heat exchanger 14. The gas heat exchanger 14 includes, inside the frame 10, a cooling gas discharge port for discharging a cooling gas 33 and a cooling gas recovery port for recovering the cooling gas 33. The gas heat exchanger 14 also includes, outside the frame 10, a cooling water supply port for supplying cooling water 32 and a cooling water discharge port for discharging the cooling water 32. The cooling water 32 is, for example, water at 30 degrees Celsius, and the cooling gas 33 is, for example, gaseous hydrogen at 40 degrees Celsius or air at 40 degrees Celsius. The cooling gas 33 circulates inside the frame 10 and, for example, passes through the rotor 11 in the axial direction to cool the rotor 11. The cooling gas 33 that has cooled the rotor 11 is recovered from the cooling gas recovery port of the gas heat exchanger 14, cooled by the cooling water 32 in the gas heat exchanger 14, and released from the cooling gas discharge port. The cooling water 32 that has cooled the cooling gas 33 is discharged from a cooling water discharge port, passes through the cooling water heat exchanger 21, and is then supplied from a cooling water supply port. The cooling water heat exchanger 21 obtains seawater 31 at, for example, 20 degrees Celsius from the ocean, and cools the cooling water 32 with the seawater 31. The seawater 31 that has cooled the cooling water 32 is discharged into the ocean.

[0012] The liquefied gas tank 20 stores liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less, and supplies the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less to the liquefied gas supply port 15 of the frame 10 as the refrigerant 30. The liquefied gas is, for example, liquefied natural gas at a temperature of 120 K or less, or liquefied hydrogen at a temperature of 20 K or less. The stator 13 inside the frame 10 is cooled by the liquefied gas refrigerant 30 flowing in the axial direction. After absorbing heat from the stator 13, the liquefied gas refrigerant 30 is partially or completely vaporized and released from the refrigerant discharge port 16 of the frame 10 to be sent to a fuel gas utilization device that uses the refrigerant 30 as fuel gas. The refrigerant 30 released from the refrigerant discharge port 16 is entirely sent to the fuel gas utilization device and does not circulate back to the liquefied gas tank 20.

[0013] In the past, when the fuel gas utilization device was a gas turbine, fuel gas was obtained by heating liquefied gas. In the rotating electric machine 100 according to the first embodiment, for example, by sending the refrigerant 30 discharged from the refrigerant discharge port 16 to the gas turbine, which is the fuel gas utilization device, it is not necessary to heat the liquefied gas, or it is possible to reduce the energy required to heat the liquefied gas.

[0014] Fig. 2 is a diagram showing the configuration of a modified example of the rotating electric machine according to the first embodiment. A rotating electric machine 100a according to the modified example of the first embodiment includes a frame 10, a rotor 11, a shaft 12, a stator 13, and a liquefied gas tank 20. In Fig. 1, the frame 10, the rotor 11, the shaft 12, and the stator 13 are shown in schematic cross section. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10.

[0015] The liquefied gas tank 20 stores liquefied gas, which is a fuel gas liquefied at a temperature of 120 K or less, and supplies the liquefied gas, which is a fuel gas liquefied at a temperature of 120 K or less, to the liquefied gas supply port 15 of the frame 10 as the refrigerant 30. The liquefied gas is, for example, liquefied natural gas at a temperature of 120 K or less or liquefied hydrogen at a temperature of 20 K or less. The stator 13 inside the frame 10 is cooled by the liquefied gas, which is the refrigerant 30, flowing in the axial direction. After absorbing heat from the stator 13, the liquefied gas, which is the refrigerant 30, is partially or completely vaporized and discharged from the refrigerant discharge port 16 of the frame 10. The liquefied gas, which is the refrigerant 30, is then sent to a fuel gas utilization device that utilizes the refrigerant 30 as fuel gas. Furthermore, after absorbing heat from the stator 13, the liquefied gas, which is the refrigerant 30, is partially vaporized, and the vaporized refrigerant 30 cools the rotor 11. The temperature of the vaporized refrigerant 30 that cools the rotor 11 is, for example, 0 to 30 degrees Celsius. The vaporized refrigerant 30 that has absorbed the heat of the rotor 11 is released from the vaporized refrigerant outlet 17 of the frame 10 and sent to a fuel gas utilization device that uses the vaporized refrigerant 30 as fuel gas. The refrigerant 30 released from the refrigerant outlet 16 and the vaporized refrigerant 30 released from the vaporized refrigerant outlet 17 are all sent only to the fuel gas utilization device and are not circulated back to the liquefied gas tank 20.

[0016] In the past, when the fuel gas utilization device was a gas turbine, fuel gas was obtained by heating liquefied gas. In the rotating electric machine 100a according to the modification of the first embodiment, for example, by sending the refrigerant 30 discharged from the refrigerant discharge port 16 or the vaporized refrigerant 30 discharged from the vaporized refrigerant discharge port 17 to the gas turbine, which is the fuel gas utilization device, it is not necessary to heat the liquefied gas, or the energy required to heat the liquefied gas can be reduced. Furthermore, by cooling the stator 13 and the rotor 11 using only the liquefied gas, the size of the frame 10 can be reduced.

[0017] Fig. 3 is a diagram showing the configuration of a further modified example of the rotating electric machine according to the first embodiment. A rotating electric machine 100b according to the further modified example of the first embodiment includes a frame 10, a rotor 11, a shaft 12, a stator 13, and a liquefied gas tank 20. In Fig. 3, the frame 10, the rotor 11, the shaft 12, and the stator 13 are shown in schematic cross section. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10.

[0018] The liquefied gas tank 20 stores liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less, and supplies the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less to the liquefied gas supply port 15 of the frame 10 as the refrigerant 30. The liquefied gas may be, for example, liquefied natural gas at a temperature of 120 K or less or liquefied hydrogen at a temperature of 20 K or less. The stator 13 and rotor 11 inside the frame 10 are cooled by the liquefied gas refrigerant 30 flowing in the axial direction. After absorbing heat from the stator 13 and rotor, the liquefied gas refrigerant 30 is partially or completely vaporized and released from the refrigerant outlet 16 of the frame 10 to be sent to a fuel gas utilization device that uses the refrigerant 30 as fuel gas. The refrigerant 30 released from the refrigerant outlet 16 is sent exclusively to the fuel gas utilization device and does not circulate back to the liquefied gas tank 20. The refrigerant 30 released from the refrigerant outlet 16 may be, for example, a gas at a temperature between 0 and 30 degrees Celsius.

[0019] In the past, when the fuel gas utilization device was a gas turbine, fuel gas was obtained by heating liquefied gas. In the rotating electric machine 100b according to a further modification of the first embodiment, for example, by sending the refrigerant 30 discharged from the refrigerant discharge port 16 to the gas turbine, which is the fuel gas utilization device, it is not necessary to heat the liquefied gas, or the energy required to heat the liquefied gas can be reduced. Furthermore, by cooling the stator 13 and the rotor 11 using only the liquefied gas, the size of the frame 10 can be reduced.

[0020] 3 shows an example in which refrigerant 30 is supplied to one refrigerant supply port 15 and discharged from one refrigerant discharge port 16, but a stator refrigerant supply port and a rotor refrigerant supply port may be provided separately as refrigerant supply ports, and a stator refrigerant discharge port and a rotor refrigerant discharge port may be provided separately as refrigerant discharge ports. In this case, the refrigerant supplied from the liquefied gas tank 20 to the stator refrigerant supply port cools the stator 13, and the refrigerant 30 having cooled the stator 13 is discharged from the stator refrigerant discharge port, and the refrigerant supplied from the liquefied gas tank 20 to the rotor refrigerant supply port cools the rotor 11, and the refrigerant 30 having cooled the rotor 11 is discharged from the rotor refrigerant discharge port.

[0021] As described above, the rotating electric machine according to embodiment 1 comprises a frame 10, a rotor 11, and a stator 13, and the rotor 11 and the stator 13 are stored inside the frame 10. The frame 10 comprises a refrigerant supply port 15 through which a liquefied gas having a temperature of 120 K or less, obtained by liquefying a fuel gas, is supplied as the refrigerant 30, and a refrigerant discharge port 16 through which the partially or completely vaporized refrigerant 30 is output to a fuel gas utilization device. The stator 13 is cooled by the refrigerant 30, which is a liquefied gas having a temperature of 120 K or less, and the fuel gas is hydrogen gas or liquefied natural gas, so that a high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0022] Embodiment 2. Fig. 4 is a diagram showing the configuration of a rotating electric machine according to embodiment 2. A rotating electric machine 100c according to embodiment 2 includes a frame 10, a rotor 11, a shaft 12, a stator 13, a gas heat exchanger 14a, and a liquefied gas tank 20. In Fig. 4, the frame 10, the rotor 11, the shaft 12, and the stator 13 are shown in schematic cross section. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10.

[0023] The frame 10 includes a gas heat exchanger 14a. The gas heat exchanger 14a includes, inside the frame 10, a cooling gas discharge port for discharging the cooling gas 33 and a cooling gas recovery port for recovering the cooling gas 33. The gas heat exchanger 14a also includes, outside the frame 10, a refrigerant supply port 141 for supplying liquefied gas, obtained by liquefying fuel gas and having a temperature of 120 K or less, as the refrigerant 30 from a liquefied gas tank 20, and a refrigerant discharge port 142 for discharging the refrigerant 30. The liquefied gas may be, for example, liquefied natural gas at 120 K or less or liquefied hydrogen at 20 K or less. The cooling gas 33 may be, for example, gaseous hydrogen or air. The temperature of the cooling gas 33 is, for example, 0 to 30 degrees Celsius. The cooling gas 33 circulates inside the frame 10 to cool the rotor 11 and the stator 13. The direction in which the cooling gas 33 flows through the rotor 11 and the stator 13 may be either radial or axial. The cooling gas 33 that has cooled the rotor 11 and the stator 13 is recovered from a cooling gas recovery port of the gas heat exchanger 14a, cooled in the gas heat exchanger 14a by a liquefied gas of 120 K or less that serves as the refrigerant 30, and released from a cooling gas discharge port. The refrigerant 30 that has cooled the cooling gas 33 is partially or entirely vaporized, released from a refrigerant discharge port 142 of the gas heat exchanger 14a, and sent to a fuel gas utilization device that uses the refrigerant 30 as fuel gas. All of the refrigerant 30 released from the refrigerant discharge port 142 of the gas heat exchanger 14a is sent only to the fuel gas utilization device and does not circulate back to the liquefied gas tank 20.

[0024] 5 is a diagram showing the configuration of a rotating electric machine of the comparative example. The rotating electric machine 200 of the comparative example is a conventional rotating electric machine and includes a frame 10, a rotor 11, a shaft 12, a stator 13, a gas heat exchanger 14b, and a coolant heat exchanger 21. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10, similar to the rotating electric machine 100c of the second embodiment. The gas heat exchanger 14b is provided on the frame 10 and includes a cooling gas discharge port for discharging a cooling gas 33 and a cooling gas recovery port for recovering the cooling gas 33 inside the frame 10. The cooling gas 33 is, for example, gaseous hydrogen or air. The cooling gas 33 circulates inside the frame 10 to cool the rotor 11 and the stator 13, similar to the gas heat exchanger 14a of the second embodiment.

[0025] The cooling gas 33 that has cooled the rotor 11 and the stator 13 is recovered from the cooling gas recovery port of the gas heat exchanger 14b, cooled by cooling water 32 in the gas heat exchanger 14b, and released from the cooling gas discharge port; the cooling water 32 that has cooled the cooling gas 33 is released from the cooling water discharge port, passes through the cooling water heat exchanger 21, and is then supplied from the cooling water supply port; the cooling water heat exchanger 21 obtains seawater 31 at, for example, 20 degrees Celsius from the ocean, and the seawater 31 cools the cooling water 32; and the seawater 31 that has cooled the cooling water 32 is released into the ocean, just like in the rotating electric machine 100 in embodiment 1.

[0026] In the rotating electric machine 100c according to the second embodiment shown in Fig. 4, the gas heat exchanger 14b shown in Fig. 5 is replaced with the gas heat exchanger 14a shown in Fig. 4, and a liquefied gas tank 20 is added, so that the cold energy of the liquefied gas obtained by liquefying fuel gas can be effectively utilized without significantly changing the configuration of the rotating electric machine. Furthermore, by sending the refrigerant 30 discharged from the refrigerant outlet of the gas heat exchanger 14a to a gas turbine, which is a fuel gas utilization device, it is not necessary to heat the liquefied gas, or the energy required to heat the liquefied gas can be reduced.

[0027] FIG. 6 is a diagram showing the configuration of a modified example of the rotating electric machine according to the second embodiment. Comparing a rotating electric machine 100d according to the second embodiment with the rotating electric machine 100c according to the second embodiment, a gas heat exchanger 14c is located outside the frame 10. The cooling gas 33 discharged from the gas heat exchanger 14c is supplied to the inside of the frame 10, circulates inside the frame 10, and cools the rotor 11 and the stator 13. The direction in which the cooling gas 33 flows in the rotor 11 and the stator 13 may be either the radial direction or the axial direction. After cooling the rotor 11 and the stator 13, the cooling gas 33 is discharged from the frame 10 and supplied to the gas heat exchanger 14c. In the gas heat exchanger 14a, the cooling gas 33 is cooled by the refrigerant 30, which is a liquefied gas at 120 K or less, and is then discharged again.

[0028] As in the modified rotating electric machine 100d of embodiment 2, by providing the gas heat exchanger 14c outside the frame 10, the refrigerant 30 discharged from the refrigerant outlet of the gas heat exchanger 14c can be sent to a gas turbine, which is a fuel gas utilization device, thereby eliminating the need to heat the liquefied gas, or reducing the energy required to heat the liquefied gas, and simplifying the internal structure of the frame 10.

[0029] As described above, the rotating electric machine according to embodiment 2 comprises a frame 10, a rotor 11, a stator 13, and gas heat exchangers 14a and 14c. The rotor 11 and the stator 13 are stored inside the frame 10 and are cooled by the cooling gas 33 circulating within the frame 10. The gas heat exchangers 14a and 14c comprise a refrigerant supply port 141 through which a liquefied gas having a temperature of 120 K or less, obtained by liquefying a fuel gas, is supplied as the refrigerant 30, and a refrigerant discharge port 142 through which the partially or completely vaporized refrigerant 30 is output to the fuel gas utilization device. Heat is exchanged between the refrigerant 30, which is a liquefied gas having a temperature of 120 K or less, and the cooling gas 33, so that high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0030] Embodiment 3. Figure 7 is a diagram showing the configuration of a rotating electric machine according to embodiment 3. A rotating electric machine 100e according to embodiment 3 includes a frame 10, a rotor 11, a shaft 12, a stator 13, a gas heat exchanger 14d, a liquefied gas tank 20, and a temperature adjustment heat exchanger 22. Figure 7 shows schematic cross sections of the frame 10, the rotor 11, the shaft 12, and the stator 13. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10.

[0031] The temperature control heat exchanger 22 is supplied with liquefied gas, obtained by liquefying fuel gas and having a temperature of 120 K or less, as the refrigerant 30 from the liquefied gas tank 20. The liquefied gas is, for example, liquefied natural gas at 120 K or less or liquefied hydrogen at 20 K or less. The refrigerant 30 supplied to the temperature control heat exchanger 22 is heat exchanged with a temperature control refrigerant 35 to adjust its temperature. The temperature-adjusted refrigerant 30 is released to the refrigerant supply port 141 of the gas heat exchanger 14d. When the liquefied gas serving as the refrigerant 30 supplied to the temperature control heat exchanger 22 is, for example, liquefied hydrogen at 20 K or less, gaseous hydrogen having a temperature of 25 K is released from the temperature control heat exchanger 22 as the refrigerant 30. The temperature control refrigerant 35, which has been used to adjust the temperature of the refrigerant 30 and cooled, is released from the temperature control heat exchanger 22 and used, for example, to cool a gas turbine or a generator, and is then recovered by the temperature control heat exchanger 22 and used again to adjust the temperature of the refrigerant 30.

[0032] The frame 10 includes a gas heat exchanger 14d. The gas heat exchanger 14d includes, inside the frame 10, a cooling gas discharge port for discharging the cooling gas 33 and a cooling gas recovery port for recovering the cooling gas 33. The gas heat exchanger 14d also includes, outside the frame 10, a refrigerant supply port 141 for receiving the refrigerant 30 discharged from the temperature control heat exchanger 22 and a refrigerant discharge port 142 for discharging the refrigerant 30. The cooling gas 33 is, for example, gaseous hydrogen or air. The temperature of the cooling gas 33 is, for example, 0 to 30 degrees Celsius. The cooling gas 33 circulates inside the frame 10 and cools the rotor 11 and the stator 13. The flow direction of the cooling gas 33 in the rotor 11 and the stator 13 may be either radial or axial. The cooling gas 33 that has cooled the rotor 11 and the stator 13 is recovered from the cooling gas recovery port of the gas heat exchanger 14d, cooled by the refrigerant 30 in the gas heat exchanger 14d, and released from the cooling gas discharge port. The refrigerant 30 that has cooled the cooling gas 33 is released from the refrigerant discharge port 142 of the gas heat exchanger 14d and sent to a fuel gas utilization device that uses the refrigerant 30 as fuel gas. If the refrigerant 30 supplied from the temperature adjustment heat exchanger 22 to the gas heat exchanger 14d is gaseous hydrogen with a temperature of 25 K, gaseous hydrogen with a temperature higher than 25 K is released from the refrigerant discharge port of the gas heat exchanger 14d. All of the refrigerant 30 released from the refrigerant discharge port of the gas heat exchanger 14d is sent only to the fuel gas utilization device and does not circulate and return to the liquefied gas tank 20.

[0033] 7, the rotating electric machine 100e according to the third embodiment adjusts the temperature of the refrigerant 30 in the temperature adjustment heat exchanger 22, so that the refrigerant 30 can be operated at a temperature that provides high heat exchange efficiency in the gas heat exchanger 14d. In addition, the cold energy of the liquefied gas obtained by liquefying the fuel gas at a temperature of 120 K or less can be used for cooling purposes other than the rotating electric machine.

[0034] As described above, the rotating electric machine according to the third embodiment comprises the frame 10, the rotor 11, the stator 13, the temperature adjustment heat exchanger 22 which is supplied with liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less as the refrigerant 30 and discharges the temperature-adjusted refrigerant 30, and the gas heat exchanger 14d. The rotor 11 and the stator 13 are stored inside the frame 10 and are cooled by the cooling gas 33 circulating within the frame 10. The gas heat exchanger 14d comprises a refrigerant supply port 141 which is supplied with the refrigerant 30 discharged from the temperature adjustment heat exchanger 22, and a refrigerant discharge port 142 which exchanges heat between the refrigerant 30 and the cooling gas 33 and outputs the refrigerant 30 which has been partially or completely vaporized to the fuel gas utilization device. Therefore, a high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0035] Fourth Embodiment. Figure 8 is a diagram showing the configuration of a rotating electric machine according to a fourth embodiment. A rotating electric machine 100f according to the fourth embodiment includes a frame 10, a rotor 11, a shaft 12, a stator 13, a gas heat exchanger 14b, a liquefied gas tank 20, and a coolant heat exchanger 21a. Figure 8 shows a schematic cross section of the frame 10, the rotor 11, the shaft 12, and the stator 13. The frame 10 is a sealed container, and the rotor 11 and the stator 13 are housed inside the frame 10. In the fourth embodiment, the frame 10, the rotor 11, the shaft 12, the stator 13, and the gas heat exchanger 14b are the same as those included in the rotating electric machine 200 of the comparative example shown in Figure 5.

[0036] In the rotating electric machine 100f according to the fourth embodiment, the cooling water 32 that has cooled the cooling gas 33 is discharged from a cooling water discharge port, passes through the cooling water heat exchanger 21a, and is then supplied from a cooling water supply port. The liquefied gas tank 20 stores liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less, and supplies the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less as the refrigerant 30 to the refrigerant supply port 211 of the cooling water heat exchanger 21a. The liquefied gas is, for example, liquefied natural gas at a temperature of 120 K or less, or liquefied hydrogen at a temperature of 20 K or less. The cooling water heat exchanger 21a obtains, as the refrigerant 30, the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less from the liquefied gas tank 20, and the refrigerant 30 cools the cooling water 32. The liquefied gas, which is the refrigerant 30 that has cooled the cooling water 32, is partially or entirely vaporized, and is released from the refrigerant outlet 212 of the cooling water heat exchanger 21a and sent to the fuel gas utilization device that uses the refrigerant 30 as fuel gas. The refrigerant 30 released from the refrigerant outlet 212 of the cooling water heat exchanger 21a is sent entirely to the fuel gas utilization device and does not circulate back to the liquefied gas tank 20.

[0037] The rotating electric machine 100f according to the fourth embodiment shown in Figure 8 can effectively utilize the cold energy of the liquefied gas obtained by liquefying fuel gas without changing the configuration of the gas heat exchanger of the conventional rotating electric machine shown in the comparative example.

[0038] As described above, the rotating electric machine according to embodiment 4 comprises the frame 10, the rotor 11, the stator 13, the cooling water heat exchanger 21a having the refrigerant supply port 211 through which liquefied gas having a temperature of 120 K or less, obtained by liquefying fuel gas, is supplied as the refrigerant 30, and the gas heat exchanger 14b; the rotor 11 and the stator 13 are housed inside the frame 10; the cooling water heat exchanger 21a exchanges heat between the refrigerant 30 and the cooling water 32 and has a refrigerant discharge port 212 that outputs the partially or completely vaporized refrigerant 30 to the fuel gas utilization device; and the gas heat exchanger 14b exchanges heat between the cooling water 32 and the cooling gas 33 that circulates within the frame 10 to cool the rotor 11 and the stator 13, so that a high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0039] 9 is a diagram showing the configuration of a rotating electric machine cooling system according to the fifth embodiment. The rotating electric machine cooling system 300 according to the fifth embodiment includes a liquefied gas tank 20, a first rotating electric machine 100g, and a second rotating electric machine 100h. The first rotating electric machine 100g includes a first frame 10a, a first rotor 11a, a first shaft 12a, a first stator 13a, a first coolant heat exchanger 21b having a first refrigerant supply port 211b through which liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less is supplied from the liquefied gas tank 20 as the coolant 30, and a first gas heat exchanger 14e. The second rotating electric machine 100h includes a second frame 10b, a second rotor 11b, a second shaft 12b, a second stator 13b, a second coolant heat exchanger 21c having a second refrigerant supply port 211c through which the refrigerant 30 is supplied from the first coolant heat exchanger 21b, and a second gas heat exchanger 14f. 9, a schematic cross section of the first frame 10a, the first rotor 11a, the first shaft 12a, the first stator 13a, the second frame 10b, the second rotor 11b, the second shaft 12b, and the second stator 13b is shown. The first frame 10a and the second frame 10b are each a sealed container, and the first rotor 11a and the first stator 13a are housed inside the first frame 10a, and the second rotor 11b and the second stator 13b are housed inside the second frame 10b.

[0040] In the first rotating electric machine 100g, the first gas heat exchanger 14e is provided in the first frame 10a and includes a cooling gas discharge port for discharging a first cooling gas 33a and a cooling gas recovery port for recovering the first cooling gas 33a inside the first frame 10a. The first cooling gas 33a is, for example, gaseous hydrogen or air. The first cooling gas 33a circulates inside the first frame 10a and cools the first rotor 11a and the first stator 13a. After cooling the first rotor 11a and the first stator 13a, the first cooling gas 33a is recovered through the cooling gas recovery port of the first gas heat exchanger 14e, cooled by the first cooling water 32a in the first gas heat exchanger 14e, and released through the cooling gas discharge port. The first cooling water 32a that has cooled the first cooling gas 33a is released from the cooling water discharge port of the first gas heat exchanger 14e, passes through the first cooling water heat exchanger 21b, and then is supplied from the cooling water supply port of the first gas heat exchanger 14e.

[0041] In the second rotating electric machine 100h, the second gas heat exchanger 14f is provided in the second frame 10b and includes a cooling gas discharge port for discharging the second cooling gas 33b and a cooling gas recovery port for recovering the second cooling gas 33b inside the second frame 10b. The second cooling gas 33b is, for example, gaseous hydrogen or air. The second cooling gas 33b circulates inside the second frame 10b and cools the second rotor 11b and the second stator 13b. After cooling the second rotor 11b and the second stator 13b, the second cooling gas 33b is recovered through the cooling gas recovery port of the second gas heat exchanger 14f, cooled by the second cooling water 32b in the second gas heat exchanger 14f, and released through the cooling gas discharge port. The second cooling water 32b that has cooled the second cooling gas 33b is released from the cooling water outlet of the second gas heat exchanger 14f, passes through the second cooling water heat exchanger 21c, and then is supplied from the cooling water supply port of the second gas heat exchanger 14f.

[0042] The liquefied gas tank 20 stores liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less, and supplies the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less as the refrigerant 30 to a first refrigerant supply port 211b of the first cooling water heat exchanger 21b. The liquefied gas is, for example, liquefied natural gas at a temperature of 120 K or less, or liquefied hydrogen at a temperature of 20 K or less. The first cooling water heat exchanger 21b obtains the liquefied gas obtained by liquefying fuel gas at a temperature of 120 K or less as the refrigerant 30 from the liquefied gas tank 20 through the first refrigerant supply port 211b, and in the first cooling water heat exchanger 21b, the refrigerant 30 cools the first cooling water 32a. The liquefied gas that is the refrigerant 30 that has cooled the first cooling water 32a is partially or entirely vaporized, released from a first refrigerant discharge port 212b of the first cooling water heat exchanger 21b, and sent to a first fuel gas utilization device that utilizes the refrigerant 30 as fuel gas. The refrigerant 30 released from the first refrigerant discharge port 212b of the first coolant heat exchanger 21b is sent only to the first fuel gas utilization device and is not circulated back to the liquefied gas tank 20. When the second rotating electric machine 100h is operating, a portion of the refrigerant 30 that has cooled the first coolant 32a is supplied to the second refrigerant supply port 211c of the second coolant heat exchanger 21c. When the second rotating electric machine 100h is operating, the refrigerant 30 may not be released from the first refrigerant discharge port 212b, and all of the refrigerant 30 may be supplied to the second refrigerant supply port 211c of the second coolant heat exchanger 21c.

[0043] The second cooling water heat exchanger 21c obtains the refrigerant 30 from the first cooling water heat exchanger 21b through a second refrigerant supply port 211c, and the refrigerant 30 cools the second cooling water 32b in the second cooling water heat exchanger 21c. The liquefied gas, which is the refrigerant 30 that has cooled the second cooling water 32b, is released from a second refrigerant outlet 212c of the second cooling water heat exchanger 21c and sent to a second fuel gas utilization device that uses the refrigerant 30 as fuel gas. The refrigerant 30 released from the second refrigerant outlet 212c of the second cooling water heat exchanger 21c is sent only to the second fuel gas utilization device and is not circulated back to the liquefied gas tank 20.

[0044] Fig. 10 is a diagram schematically illustrating the configuration of a rotating electrical machine cooling system according to embodiment 5. The rotating electrical machine cooling system illustrated in Fig. 9 illustrates an example in which the first frame 10a includes one first gas heat exchanger 14e and the second frame 10b includes one second gas heat exchanger 14f, whereas the rotating electrical machine cooling system illustrated in Fig. 10 illustrates an example in which the first frame 10a includes two first gas heat exchangers 14e and the second frame 10b includes two second gas heat exchangers 14f. In addition, in Figure 10, the double-headed arrow connecting the first cooling water heat exchanger 21b and the first gas heat exchanger 14e indicates that the cooled first cooling water 32a is supplied from the first cooling water heat exchanger 21b to the first gas heat exchanger 14e, and the first cooling water 32a that has absorbed heat is supplied from the first gas heat exchanger 14e to the first cooling water heat exchanger 21b, and the double-headed arrow connecting the second cooling water heat exchanger 21c and the second gas heat exchanger 14f indicates that the cooled second cooling water 32b is supplied from the second cooling water heat exchanger 21c to the second gas heat exchanger 14f, and the second cooling water 32b that has absorbed heat is supplied from the second gas heat exchanger 14f to the second cooling water heat exchanger 21c. Furthermore, it shows that the refrigerant 30 released from the first cooling water heat exchanger 21b is sent to the first fuel gas utilization device 23a, that the refrigerant 30 released from the first cooling water heat exchanger 21b does not circulate and return to the liquefied gas tank 20, and that all of the refrigerant 30 released from the second cooling water heat exchanger 21c is sent only to the second fuel gas utilization device 23b, and that the refrigerant does not circulate and return to the liquefied gas tank 20.

[0045] 9 and 10 , when the first rotating electric machine 100g and the second rotating electric machine 100h are generators, even if the operating status of the generators changes suddenly in response to a sudden change in power demand, the rotating electric machine cooling system according to the fifth embodiment can reduce pressure or temperature changes in the refrigerant 30. Furthermore, when the first frame 10a and the second frame 10b are close to each other, one rotating electric machine can be cooled while the other rotating electric machine is being inspected for maintenance.

[0046] As described above, the rotating electric machine according to the fifth embodiment includes the liquefied gas tank 20, the first rotating electric machine 100g, and the second rotating electric machine 100h. The first rotating electric machine 100g includes the first frame 10a, the first rotor 11a, the first stator 13a, the first coolant heat exchanger 21b including the first refrigerant supply port 211b through which the liquefied gas obtained by liquefying fuel gas and having a temperature of 120 K or less is supplied from the liquefied gas tank 20 as the refrigerant 30, and the first gas heat exchanger 14e. The second rotating electric machine 100h includes the first frame 10a, the first rotor 11a, the first stator 13a, the first coolant heat exchanger 21b including the first refrigerant supply port 211b through which the liquefied gas obtained by liquefying fuel gas and having a temperature of 120 K or less is supplied from the liquefied gas tank 20 as the refrigerant 30, and the first gas heat exchanger 14e. The second frame 10b, the second rotor 11b, the second stator 13b, the second cooling water heat exchanger 21c having the second refrigerant supply port 211c to which the refrigerant 30 is supplied from the first cooling water heat exchanger 21b, and the second gas heat exchanger 14f, the first rotor 11a and the first stator 13a are housed inside the first frame 10a, the first cooling water heat exchanger 21b exchanges heat between the refrigerant 30 supplied from the liquefied gas tank 20 and the first cooling water 32a, and the refrigerant 30 is partially or completely vaporized. The first gas heat exchanger 14e exchanges heat between the first cooling water 32a and the first cooling gas 33a that circulates within the first frame 10a to cool the first rotor 11a and the first stator 13a. The second rotor 11b and the second stator 13b are housed within the second frame 10b. The second cooling water heat exchanger 21c is provided with a first refrigerant outlet 212b that outputs the partially or completely vaporized refrigerant 30 to the first fuel gas utilization device. The first gas heat exchanger 14e exchanges heat between the first cooling water 32a and the first cooling gas 33a that circulates within the first frame 10a to cool the first rotor 11a and the first stator 13a. The second gas heat exchanger 14f is equipped with a second refrigerant outlet 212c that exchanges heat between the refrigerant 30 obtained from the water heat exchanger 21b and the second cooling water 32b and outputs the refrigerant 30 that has exchanged heat with the second cooling water 32b to the second fuel gas utilization device, and the second gas heat exchanger 14f exchanges heat between the second cooling water 32b and the second cooling gas 33b that circulates within the second frame 10b and cools the second rotor 11b and the second stator 13b, so that high energy conversion capacity can be obtained even when the temperature inside the rotating electric machine rises.

[0047] Although various exemplary embodiments are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0048] REFERENCE SIGNS LIST 10 Frame, 10a First frame, 10b Second frame, 11 Rotor, 11a First rotor, 11b Second rotor, 12 Shaft, 12a First shaft, 12b Second shaft, 13 Stator, 13a First stator, 13b Second stator, 14, 14a, 14b, 14c, 14d Gas heat exchanger, 14e First gas heat exchanger, 14f Second gas heat exchanger, 15 Refrigerant supply port, 16 Refrigerant discharge port, 17 Vaporized refrigerant discharge port, 20 Liquefied gas tank, 21, 21a Cooling water heat exchanger, 21b First cooling water heat exchanger, 21c Second cooling water heat exchanger, 22 Temperature adjustment heat exchanger, 23a First fuel gas utilization device, 23b Second fuel gas utilization device, 30 Refrigerant, 31 Seawater, 32 Cooling water, 32a First cooling water, 32b Second cooling water, 33 Cooling gas, 33a First cooling gas, 33b Second cooling gas, 35 Temperature adjustment refrigerant, 100, 100a, 100b, 100c, 100d, 100e, 100f Rotating electric machine, 100g First rotating electric machine, 100h Second rotating electric machine, 141 Refrigerant supply port, 142 Refrigerant discharge port, 200 Rotating electric machine of comparative example, 211 Refrigerant supply port, 211b First refrigerant supply port, 211c Second refrigerant supply port, 212 Refrigerant discharge port, 212b First refrigerant discharge port, 212c Second refrigerant discharge port, 300 Rotating electric machine cooling system.

Claims

1. It comprises a frame, a rotor, and a stator. The rotor and the stator are housed inside the frame. The aforementioned frame is A refrigerant supply port is provided from which liquefied gas, obtained by liquefying fuel gas, is supplied at a temperature of 120K or lower, and It comprises a refrigerant outlet that outputs the refrigerant, which has partially or completely vaporized, to a fuel gas utilization device, The stator is cooled by the refrigerant, which is a liquefied gas at 120K or below. The rotor is cooled by the refrigerant vaporized inside the frame. A rotating electric machine characterized in that the fuel gas is hydrogen gas or liquefied natural gas.

2. It comprises a frame, a rotor, a stator, a cooling water heat exchanger equipped with a refrigerant supply port to which liquefied gas, obtained by liquefying fuel gas at a temperature of 120K or lower, is supplied as a refrigerant, and a gas heat exchanger. The rotor and the stator are housed inside the frame. The cooling water heat exchanger is, Heat exchange is performed between the refrigerant and the cooling water. The system includes a refrigerant outlet that outputs the refrigerant, which has partially or completely vaporized, to a fuel gas utilization device. The aforementioned gas heat exchanger is characterized by performing heat exchange between the cooling water and a cooling gas that circulates within the frame to cool the rotor and the stator of the rotating electric machine.

3. It is equipped with a liquefied gas tank, a first rotating electric machine, and a second rotating electric machine. The first rotating electric machine comprises a first frame, a first rotor, a first stator, a first cooling water heat exchanger equipped with a first refrigerant supply port to which liquefied gas, obtained by liquefying fuel gas at a temperature of 120K or less, is supplied from the liquefied gas tank, and a first gas heat exchanger. The second rotating electric machine comprises a second frame, a second rotor, a second stator, a second cooling water heat exchanger equipped with a second refrigerant supply port from which the refrigerant is supplied from the first cooling water heat exchanger, and a second gas heat exchanger. The first rotor and the first stator are housed inside the first frame. The first cooling water heat exchanger is, Heat exchange is performed between the refrigerant supplied from the liquefied gas tank and the first cooling water. The refrigerant, which has partially or completely vaporized, is output to the second cooling water heat exchanger. It is equipped with a first refrigerant outlet that outputs the refrigerant, which has partially or completely vaporized, to a first fuel gas utilization device, The first gas heat exchanger performs heat exchange between the first cooling water and the first cooling gas that circulates within the first frame to cool the first rotor and the first stator. The second rotor and the second stator are housed inside the second frame. The second cooling water heat exchanger is, Heat exchange is performed between the refrigerant obtained from the first cooling water heat exchanger and the second cooling water. The system includes a second refrigerant outlet that outputs the refrigerant, which has undergone heat exchange with the second cooling water, to a second fuel gas utilization device. A rotating electric machine cooling system characterized in that the second gas heat exchanger performs heat exchange between the second cooling water and a second cooling gas that circulates within the second frame to cool the second rotor and the second stator.