Electric machine based on a liquid cooling circuit

Abstract

The application relates to the motor technical field, and particularly provides a motor based on liquid cooling circulation. The motor aims to solve the problem that the rotor liquid cooling system of an existing motor flexibly matches the circulating power and cooling demand. For the purpose, the motor based on liquid cooling circulation comprises a machine body, a rotating shaft and a rotor assembly connected to the rotating shaft, the rotor assembly comprises a magnetic pole coil, and the magnetic pole coil is provided with a cooling working medium; a liquid cooling system comprises a circulating pipeline connected to the magnetic pole coil, and a condenser and a driving pump communicated in the circulating pipeline; wherein the driving pump is electrically connected with a power supply system of the motor, so that the driving pump can adjust its own operation power according to the excitation state of the motor. The application can reduce the energy consumption of the liquid cooling system, flexibly match the circulating power and cooling demand, and improve the stability and safety of system operation.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically providing a motor based on a liquid cooling cycle. Background Technology

[0002] Currently, motor cooling methods mainly include air cooling, hydrogen cooling, water cooling, and evaporative cooling. Air cooling and hydrogen cooling rely on the process of a gaseous medium blowing across the surface of the heat source for heat exchange. Water cooling relies on cooling water flowing over the heat source to remove heat. Evaporative cooling uses highly insulating, low-boiling-point fluorocarbon compounds as the cooling medium instead of the aforementioned cooling water. Water cooling and evaporative cooling can also be collectively referred to as liquid cooling. Compared to the aforementioned gas cooling methods, liquid cooling has a higher heat transfer coefficient and is more suitable for the efficient cooling of the main heat-generating components of high-power-density motors such as large-capacity, high-speed motors.

[0003] For liquid cooling systems, a drive pump is typically required in the circulating liquid circuit to provide circulation power for the cooling medium. In related technologies, the drive pump is usually located outside the motor and is controlled by an independent external power supply. However, in practical applications, the rotor's thermal load varies at different times during motor operation. A drive pump operating at a fixed frequency cannot adjust the flow rate of the cooling medium in a timely manner, resulting in a mismatch between the thermal load and the real-time cooling capacity provided by the cooling system. This leads to excessively high or low rotor coil temperatures, or frequent fluctuations, affecting material reliability and shortening motor life. This effect is particularly pronounced in high-speed rotating rotors.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] This application aims to solve the aforementioned technical problem, namely, to address the issue of how existing motor rotor liquid cooling systems can flexibly match cyclic power and cooling requirements.

[0006] In a first aspect, this application provides a motor based on a liquid cooling cycle, comprising:

[0007] The machine body includes a rotating shaft and a rotor assembly connected to the rotating shaft, the rotor assembly including a magnetic pole coil through which a cooling working fluid can pass;

[0008] A liquid cooling system, comprising a circulation pipeline connected to the magnetic pole coil and a condenser and a drive pump connected in the circulation pipeline;

[0009] The drive pump is electrically connected to the power supply system of the motor, so that the drive pump can adjust its own operating power according to the excitation state of the motor.

[0010] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the condenser is disposed outside the machine body, and the liquid cooling system further includes a rotary sealing device, which is located at the top of the machine body;

[0011] The circulation pipeline includes:

[0012] The first liquid supply line and the first liquid discharge line are both located inside the machine body, and the first liquid supply line and the first liquid discharge line are both connected between the rotary sealing device and the magnetic pole coil.

[0013] The second liquid supply line and the second liquid drain line are both located outside the machine body. The second liquid supply line and the second liquid drain line are both connected between the rotary sealing device and the condenser. The first liquid supply line is connected to the second liquid supply line, and the first liquid drain line is connected to the second liquid drain line.

[0014] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the rotor assembly includes a rotor support connected to the rotating shaft, and the drive pump is disposed on the rotor support;

[0015] The power supply system of the motor includes magnetic pole leads disposed on the rotor support, and the drive pump is connected in the first liquid supply pipeline and electrically connected to the magnetic pole leads.

[0016] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the rotor assembly includes a rotor support connected to the rotating shaft, and the drive pump is disposed on the rotor support;

[0017] The power supply system of the motor includes magnetic pole leads disposed on the rotor support, and the drive pump is connected in the first drain pipe and electrically connected to the magnetic pole leads.

[0018] In one of the above-mentioned technical solutions for a motor based on liquid cooling cycle, the power supply system of the motor includes an excitation power supply cable, and the drive pump is connected in the second liquid supply pipeline and electrically connected to the conductive slip ring on the excitation power supply cable.

[0019] In one of the above-mentioned technical solutions for a motor based on liquid cooling cycle, the power supply system of the motor includes an excitation power supply cable, and the drive pump is connected in the second drain pipe and electrically connected to the conductive slip ring on the excitation power supply cable.

[0020] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the condenser is disposed inside the machine body;

[0021] The circulation pipeline includes:

[0022] The first liquid supply line and the first liquid discharge line are both located inside the machine body, and both the first liquid supply line and the first liquid discharge line are connected between the condenser and the magnetic pole coil.

[0023] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the rotor assembly includes a rotor support connected to the rotating shaft, and the condenser and the drive pump are both disposed on the rotor support;

[0024] The power supply system of the motor includes magnetic pole leads disposed on the rotor support, and the drive pump is connected in the first liquid supply pipeline and electrically connected to the magnetic pole leads.

[0025] In one technical solution of the above-mentioned motor based on liquid cooling cycle, the rotor assembly includes a rotor support connected to the rotating shaft, and the condenser and the drive pump are both disposed on the rotor support;

[0026] The power supply system of the motor includes magnetic pole leads disposed on the rotor support, and the drive pump is connected in the first drain pipe and electrically connected to the magnetic pole leads.

[0027] In one of the above-mentioned technical solutions for a motor based on a liquid cooling cycle, the motor is a hydro-generator.

[0028] As described above, this application connects the drive pump of the liquid cooling system to the power supply system of the motor, allowing the drive pump to draw power from the motor's power supply. Since the motor's excitation state varies with the load, the drive pump can adjust its operating power accordingly. It increases the drive pump's power when the system is under strong excitation and decreases it when the system is under light load, thus avoiding excessive energy consumption caused by the drive pump always operating at high power. This achieves the goal of reducing energy consumption, allowing the motor rotor liquid cooling system to flexibly match the circulating power and cooling requirements. Furthermore, the change in the drive pump's operating power with the motor's excitation state also reduces the average pressure in the circulating pipeline during the liquid cooling system's operating cycle. This reduces the sealing difficulty of the circulating pipeline, especially at the rotary seal location, thereby reducing the probability of coolant leakage in the liquid cooling system and improving the system's operational stability and safety. Attached Figure Description

[0029] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0030] Figure 1 This is a schematic diagram of a liquid-cooled cycle-based motor according to the first embodiment of this application;

[0031] Figure 2This is a schematic diagram of a liquid-cooled cycle-based motor according to a second embodiment of this application;

[0032] Figure 3 This is a schematic diagram of a liquid-cooled cycle-based motor according to a third embodiment of this application.

[0033] Figure 4 This is a schematic diagram of a liquid-cooled cycle-based motor according to the fourth embodiment of this application.

[0034] Figure 5 This is a schematic diagram of a liquid-cooled cycle-based motor according to the fifth embodiment of this application.

[0035] In the figure, the reference numerals refer to the following:

[0036] 100. Body; 110. Shaft; 120. Rotor assembly; 121. Rotor support; 122. Magnetic yoke; 123. Magnetic pole; 124. Magnetic pole coil; 130. Conductive slip ring; 140. Magnetic pole lead; 200. Liquid cooling system; 210. Condenser; 220. Drive pump; 231. First liquid supply line; 232. First liquid discharge line; 233. Second liquid supply line; 234. Second liquid discharge line; 240. Rotary sealing device. Detailed Implementation

[0037] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0038] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Reference Figure 1 This is a schematic diagram of a liquid-cooled motor according to an embodiment of this application, which includes a body 100 and a liquid cooling system 200. The body 100 is the main body of the motor and includes a shaft 110 and a rotor assembly 120. The body 100 also includes a stator assembly and other necessary power transmission systems, which will not be described in detail here. The liquid cooling system 200 is mounted on the body 100 and is responsible for cooling the rotor assembly 120.

[0041] In the embodiments of this application, a hydroelectric generator is used as an example for illustrative purposes. The rotor assembly 120 includes a rotor support 121, a magnetic yoke 122, magnetic poles 123, and magnetic pole coils 124. The magnetic pole coils 124 are made of hollow wire and have a cooling medium that can pass through them. The liquid cooling system 200 includes a circulation pipe connected to the magnetic pole coils 124 and a condenser 210 and a drive pump 220 connected in the circulation pipe. The circulation pipe, magnetic pole coils 124, condenser 210, and drive pump 220 are interconnected to form a loop for circulating the cooling medium.

[0042] The drive pump 220 is electrically connected to the power supply system of the motor, thereby enabling the drive pump 220 to adjust its operating power according to the excitation state of the motor.

[0043] Reference Figure 1 In one embodiment of this application, both the condenser 210 and the drive pump 220 are located outside the housing 100, i.e., outside the foundation pit, to reduce the impact of the condenser 210 and the drive pump 220 on the motor operation. In this case, the circulation pipeline of the liquid cooling system 200 includes a first liquid supply pipeline 231 and a first liquid discharge pipeline 232 located inside the housing 100, and a second liquid supply pipeline 233 and a second liquid discharge pipeline 234 located outside the housing. Simultaneously, a rotary sealing device 240 is also provided at the top of the housing 100. The first liquid supply pipeline 231 and the first liquid discharge pipeline 232 are both connected between the rotary sealing device 240 and the magnetic pole coil 124. Similarly, the second liquid supply pipeline 233 and the second liquid discharge pipeline 234 are both connected to the rotary sealing device 240. Between the sealing device 240 and the condenser 210, since the first liquid supply line 231 and the first liquid discharge line 232 rotate with the rotor assembly 120, while the condenser 210, the second liquid supply line 233 and the second liquid discharge line 234 outside the machine body 100 are in a stationary state, the first liquid supply line 231 and the second liquid supply line 233 can be connected to each other while rotating relative to each other by rotating the sealing device 240, and the first liquid discharge line 232 and the second liquid discharge line 234 can be connected to each other while rotating relative to each other.

[0044] Based on the above configuration, the drive pump 220 can be connected to the second liquid supply line 233. At this time, the drive pump 220 is electrically connected to the conductive slip ring 130 on the excitation power supply cable, and the excitation power supply cable supplies power to the drive pump 220.

[0045] Of course, refer to Figure 2 In some other embodiments, the drive pump 220 may also be connected in the second drain line 234. Similarly, the drive pump 220 is electrically connected to the conductive slip ring on the excitation power supply cable, which supplies power to the drive pump 220.

[0046] As described above, in this configuration, the drive pump 220 draws power from the motor's excitation power supply cable. Simultaneously, an adaptive power supply system based on excitation voltage / current needs to be designed, allowing the drive pump 220 to adjust its operating power according to changes in excitation voltage / current. For example, in some known technologies, the excitation voltage / current can be monitored in real time to achieve power distribution. Specifically, a DC-DC converter or DC-AC inverter can be used to change the operating power of the drive pump 220 with changes in excitation voltage / current. Furthermore, a priority control circuit can be added before the DC-DC converter or inverter to ensure that the excitation current always prioritizes supplying the rotor assembly 120, with the remaining power then supplied to the drive pump 220, achieving dynamic current limiting protection. When the excitation current is less than a preset value, the power supply to the drive pump 220 is cut off to prevent demagnetization and ensure normal motor operation. Of course, the above-described method of adaptively adjusting the operating power of the drive pump 220 based on the motor's excitation state is conventional technology in this field and will not be elaborated upon here.

[0047] This application connects the drive pump 220 of the liquid cooling system 200 to the power supply system of the motor, allowing the drive pump 220 to draw power from the motor's power supply system. Since the motor's excitation state changes with the load, the drive pump 220 can adjust its operating power according to the motor's excitation state. When the system is under strong excitation, the power of the drive pump 220 is increased; when the system is under light load, the power of the drive pump 220 is decreased. This avoids excessive energy consumption caused by the drive pump 220 always operating at high power, thus achieving the goal of reducing energy consumption. In other words, the motor rotor liquid cooling system can flexibly match the circulating power and cooling requirements. On the other hand, the change in the drive pump 220's operating power with the motor's excitation state also reduces the average pressure in the circulation pipeline during the operating cycle of the liquid cooling system 200, thereby reducing the sealing difficulty of the circulation pipeline, especially at the rotary seal device 240. This reduces the probability of coolant leakage in the liquid cooling system, improving the system's operational stability and safety.

[0048] Reference Figure 3In some other implementations of this application, the drive pump 220 is disposed inside the housing 100. For example, the drive pump 220 may be fixed on the rotor support 121. In the above case, the drive pump 220 is electrically connected to the magnetic pole lead 140 on the rotor support 121, and the drive pump 220 draws power from the power supply system of the motor through the magnetic pole lead 140. The drive pump 220 is connected and disposed in the first liquid supply pipeline 231.

[0049] Of course, such as Figure 4 As shown, the drive pump 220 can also be connected to the first drain line 232.

[0050] When the drive pump 220 is installed inside the body 100, the distance between the drive pump 220 and the rotary sealing device 240 is greater. During the operation of the drive pump 220, the pressure caused by the fluid on the sealing joint of the rotary sealing device 240 is reduced, which can reduce the sealing difficulty and further improve the stability and safety of the system operation.

[0051] Reference Figure 5 In some other implementations of this application, both the condenser 210 and the drive pump 220 are located inside the housing 100. In this case, the rotary sealing device is omitted. Correspondingly, the circulation pipeline only includes a first liquid supply pipeline 231 and a first liquid discharge pipeline 232, both of which are connected between the condenser 210 and the magnetic pole coil 124. In this case, the condenser 210 and the drive pump 220 can be fixed to the rotor support 121. Similarly, the drive pump 220 is electrically connected to the magnetic pole lead 140 on the rotor support 121, and the drive pump 220 is connected in the first liquid supply pipeline 231. With the above method, there is no need to set up a rotary sealing device, thus further reducing the sealing difficulty of the system.

[0052] Of course, the drive pump 220 can also be connected to the first drain line 232 as needed.

[0053] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A motor based on a liquid cooling cycle, characterized in that, include: The body (100) includes a rotating shaft (110) and a rotor assembly (120) connected to the rotating shaft (110), the rotor assembly (120) including a magnetic pole coil (124) through which a cooling working fluid can pass; The liquid cooling system (200) includes a circulation pipeline connected to the magnetic pole coil (124) and a condenser (210) and a drive pump (220) connected in the circulation pipeline; The drive pump (220) is electrically connected to the power supply system of the motor so that the drive pump (220) can adjust its own operating power according to the excitation state of the motor.

2. The motor based on liquid cooling cycle according to claim 1, characterized in that, The condenser (210) is disposed outside the body (100), and the liquid cooling system (200) further includes a rotary sealing device (240), which is located at the top of the body (100); The circulation pipeline includes: The first liquid supply line (231) and the first liquid discharge line (232) are both located inside the body (100), and the first liquid supply line (231) and the first liquid discharge line (232) are both connected between the rotary sealing device (240) and the magnetic pole coil (124); The second liquid supply line (233) and the second liquid discharge line (234) are both located outside the body (100). The second liquid supply line (233) and the second liquid discharge line (234) are both connected between the rotary sealing device (240) and the condenser (210). The first liquid supply line (231) is connected to the second liquid supply line (233), and the first liquid discharge line (232) is connected to the second liquid discharge line (234).

3. The motor based on liquid cooling cycle according to claim 2, characterized in that, The rotor assembly (120) includes a rotor bracket (121) connected to the rotating shaft (110), and the drive pump (220) is disposed on the rotor bracket (121); The power supply system of the motor includes a magnetic pole lead (140) disposed on the rotor support (121), and the drive pump (220) is connected in the first liquid supply pipeline (231) and electrically connected to the magnetic pole lead (140).

4. The motor based on liquid cooling cycle according to claim 2, characterized in that, The rotor assembly (120) includes a rotor bracket (121) connected to the rotating shaft (110), and the drive pump (220) is disposed on the rotor bracket (121); The power supply system of the motor includes a magnetic pole lead (140) disposed on the rotor support (121), and the drive pump (220) is connected in the first drain pipe (232) and electrically connected to the magnetic pole lead (140).

5. The motor based on liquid cooling cycle according to claim 2, characterized in that, The power supply system of the motor includes an excitation power supply cable, and the drive pump (220) is connected in the second liquid supply pipeline (233) and electrically connected to the conductive slip ring (130) on the excitation power supply cable.

6. The motor based on liquid cooling cycle according to claim 2, characterized in that, The power supply system of the motor includes an excitation power supply cable, and the drive pump (220) is connected in the second drain pipe (234) and electrically connected to the conductive slip ring (130) on the excitation power supply cable.

7. The motor based on liquid cooling cycle according to claim 1, characterized in that, The condenser (210) is disposed inside the body (100); The circulation pipeline includes: The first liquid supply line (231) and the first liquid discharge line (232) are both located inside the body (100), and the first liquid supply line (231) and the first liquid discharge line (232) are both connected between the condenser (210) and the magnetic pole coil (124).

8. The motor based on liquid cooling cycle according to claim 7, characterized in that, The rotor assembly (120) includes a rotor support (121) connected to the rotating shaft (110), and the condenser (210) and the drive pump (220) are both disposed on the rotor support (121); The power supply system of the motor includes a magnetic pole lead (140) disposed on the rotor support (121), and the drive pump (220) is connected in the first liquid supply pipeline (231) and electrically connected to the magnetic pole lead (140).

9. The motor based on liquid cooling cycle according to claim 7, characterized in that, The rotor assembly (120) includes a rotor support (121) connected to the rotating shaft (110), and the condenser (210) and the drive pump (220) are both disposed on the rotor support (121); The power supply system of the motor includes a magnetic pole lead (140) disposed on the rotor support (121), and the drive pump (220) is connected in the first drain pipe (232) and electrically connected to the magnetic pole lead (140).

10. The motor based on a liquid-cooled cycle according to any one of claims 1 to 9, characterized in that, The motor is a hydroelectric generator.

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