Liquid-cooled motor and generator
By combining a coolant cooling and circulation device with a motor temperature monitoring device, the liquid cooling system is dynamically adjusted, solving the problems of insufficient heat dissipation and energy waste in existing liquid cooling systems, and achieving efficient and economical motor heat dissipation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHIHEZI UNIVERSITY
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-01
AI Technical Summary
Existing liquid cooling systems lack the ability to sense multi-dimensional operating conditions such as motor temperature and coolant temperature in real time, resulting in insufficient cooling or excessive energy consumption, making it difficult to effectively dissipate heat during high power density and high load operation.
It employs a coolant cooling and circulation device and a motor temperature monitoring device. The main unit controls the flow and circulation of coolant to achieve adaptive heat dissipation. Combined with an air-cooled heat dissipation structure, the heat dissipation mode is dynamically adjusted according to the motor temperature.
It achieves efficient heat dissipation, avoids coolant idling loss and energy waste, and reduces operating costs.
Smart Images
Figure CN121966141A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor heat dissipation technology, and in particular to a liquid-cooled electric motor and generator. Background Technology
[0002] Electric motors (including electric motors and generators) are core power components in various equipment used in modern industrial and agricultural production. During operation, they generate a large amount of heat due to electromagnetic losses, iron losses, and other factors. If this waste heat cannot be dissipated in a timely and effective manner, the internal temperature of the motor will continue to rise, leading to a series of problems such as accelerated aging of insulation materials, decreased motor efficiency, and unstable output torque. In severe cases, it can even cause winding burnout, resulting in equipment failure and production interruption. Therefore, an efficient and reliable heat dissipation system is crucial for ensuring stable motor operation and extending its service life.
[0003] Currently, the most widely used solution for motor cooling is air cooling. This typically involves installing a fan on the shaft or adding a separate fan to drive airflow over cooling fins on the motor casing to remove heat. This method is simple in structure, low in cost, and easy to maintain. However, its cooling efficiency is easily affected by ambient temperature, and air has a low heat capacity and thermal conductivity, limiting its cooling capacity. For motors with high power density, continuous high load operation, or operating in enclosed environments, air cooling often struggles to control temperature rise within the ideal range.
[0004] To overcome the limitations of air cooling, liquid cooling technology has been introduced into the field of motor heat dissipation. Liquid cooling systems use coolants such as water and ethylene glycol solutions as cooling media, whose specific heat capacity is much higher than that of air. Through circulation, they can efficiently absorb and remove the heat generated by the motor. However, most existing liquid cooling systems operate in a single mode, typically running at full power from startup, with cooling output remaining essentially constant, or only supporting manual, phased coarse adjustments. These systems lack real-time sensing capabilities for multi-dimensional operating conditions such as motor temperature and coolant temperature, and lack the intelligent decision-making ability to dynamically adjust the liquid cooling system's operating state based on the actual motor temperature. This poses a risk of insufficient cooling or excessive energy consumption, hindering further improvements in energy efficiency and adaptive capabilities. Summary of the Invention
[0005] The purpose of this invention is to provide a liquid-cooled electric motor and generator to solve the problems existing in the prior art. It can achieve high-efficiency heat dissipation, ensure heat dissipation effect, and prevent energy waste caused by coolant cooling and idling loss or premature intervention of the circulation device, thereby reducing operating costs.
[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a liquid-cooled electric motor and a generator, comprising at least one cooling motor, a coolant cooling and circulation device, a motor temperature monitoring device, and a main unit. Each cooling motor includes a motor body and a coolant channel and a fan-cooled heat dissipation structure disposed on the motor body. The inlet and outlet of the coolant channel are respectively connected to the outlet and inlet of one of the coolant cooling and circulation devices. At least one motor temperature monitoring device is connected to each cooling motor, and each motor temperature monitoring device is used to monitor the temperature of the corresponding cooling motor. Each motor temperature monitoring device is communicatively connected to the main unit, which can control the coolant cooling and circulation device to circulate coolant into the coolant channels of N cooling motors for cooling circulation based on the motor temperature detected by the motor temperature monitoring device, where N is an integer greater than or equal to 0.
[0007] Preferably, a motor whose temperature is greater than or equal to a preset temperature threshold of the corresponding cooling motor is called a motor to be cooled; the host can control the coolant cooling and circulation device to introduce coolant into the motor to be cooled or all the cooling motors and perform cooling circulation when the temperatures of M cooling motors are respectively greater than or equal to the preset temperature thresholds of the corresponding cooling motors, where M is an integer greater than or equal to 1; or, the host can control the coolant cooling and circulation device to introduce coolant into all the cooling motors and perform cooling circulation when the average temperature of all the cooling motors is greater than or equal to a preset average temperature threshold.
[0008] Preferably, each of the coolant cooling and circulation devices includes a cooling housing, a circulation pump, a spray assembly, a cooling fan, and a fan drive device. The inlet of each circulation pump is connected to the coolant outlet of the corresponding cooling housing, and the outlet of each circulation pump is connected to the inlet of at least one motor coolant channel. The coolant inlet of each cooling housing is connected to the outlet of at least one motor coolant channel. Each cooling housing is provided with multiple liquid inlet channels, the lower end of each liquid inlet channel is connected to the coolant inlet of the corresponding cooling housing, and the upper end of each liquid inlet channel is connected to and communicates with at least one spray assembly. Each spray assembly is connected inside the cooling housing and is used to spray the coolant. Each cooling housing is fixedly connected to the fan drive device, and the output end of each fan drive device is connected to the corresponding cooling fan and can drive the corresponding cooling fan to rotate. Each circulation pump is connected to the host, and the host can control the start and stop of each circulation pump.
[0009] Preferably, each of the coolant cooling and circulation devices further includes a packing material fixedly connected in the corresponding cooling housing, and each of the spraying components is capable of spraying the coolant onto the corresponding packing material.
[0010] Preferably, each of the coolant cooling and circulation devices further includes a droplet collector fixedly connected in the corresponding cooling housing. Each droplet collector is disposed at the opening of the corresponding cooling housing. Each droplet collector includes a plurality of droplet collecting plates that are radially spaced apart. Each droplet collecting plate is wavy along its own length direction and wavy along its own width direction.
[0011] Preferably, each of the cooling housings has an opening at its top, and a cooling fan is provided at the opening of each of the cooling housings; each of the fillers is provided below the corresponding spray assembly; each of the cooling housings has an air inlet on its side wall, and the air inlet of each of the cooling housings is provided below the corresponding filler.
[0012] Preferably, each of the coolant cooling and circulation devices further includes a liquid injection platform and a liquid replenishment tank. The outlet of each liquid injection platform is connected to the inner cavity of the corresponding cooling housing, and the outlet of each liquid replenishment tank is connected to the inlet of the corresponding liquid injection platform. The coolant outlet of each cooling housing is lower than the inlet of the corresponding liquid injection platform.
[0013] Preferably, each of the coolant cooling and circulation devices further includes a coolant temperature monitoring device that is communicatively connected to the host. The coolant temperature monitoring device is installed at both the coolant inlet and the coolant outlet of the coolant cooling and circulation device. Each of the cooling fans is connected to the host, and the host can adjust the speed of the corresponding cooling fan according to the coolant temperature detected by each of the coolant temperature monitoring devices.
[0014] Preferably, the air-cooled heat dissipation structure includes heat sinks disposed on the motor housing of the cooling motor and / or a cooling fan fixedly connected to the shaft of the cooling motor.
[0015] Preferably, the motor coolant channel includes an annular inlet channel, an annular outlet channel, and an axial channel extending along the axial direction of the corresponding motor body. The annular inlet channel and the annular outlet channel of each cooling motor are respectively disposed at both ends of the corresponding motor body. Multiple axial channels are disposed between the annular inlet channel and the annular outlet channel of each cooling motor. The two ends of each axial channel are respectively connected to the corresponding annular inlet channel and the annular outlet channel. Each cooling fan is disposed at one end of the corresponding motor body where the annular outlet channel is disposed, and each cooling fan can cool the coolant in the corresponding annular outlet channel.
[0016] The present invention achieves the following technical effects compared to the prior art: This invention provides a liquid-cooled electric motor and a generator, including a coolant cooling and circulation device, a motor temperature monitoring device, and a main unit. At least one coolant cooling and circulation device and one motor temperature monitoring device are provided. Each cooled motor includes a motor body and a coolant channel and a fan-cooled heat dissipation structure disposed on the motor body. The inlet and outlet of the coolant channel are respectively connected to the outlet and inlet of a coolant cooling and circulation device. At least one motor temperature monitoring device is connected to each cooled motor, and each motor temperature monitoring device is used to monitor the temperature of the corresponding cooled motor. Each motor temperature monitoring device is communicatively connected to the main unit, which can control the coolant cooling and circulation device to introduce coolant into the coolant channels of N cooled motors and perform cooling circulation based on the motor temperature detected by the motor temperature monitoring device, where N is an integer greater than or equal to 0.
[0017] The air-cooled heat dissipation structure dissipates heat from the motor body into the air. When the motor temperature is low, the main unit controls the coolant cooling and circulation device to shut off, and the motor body dissipates heat solely through the air-cooled structure. When the temperature of one or more (two or more) motors exceeds a preset temperature threshold, the main unit controls the coolant cooling and circulation device to activate, introducing coolant into the overheated motor body or all motor bodies for liquid cooling. This invention achieves adaptive motor cooling through the timely activation of the coolant cooling and circulation device, ensuring high-efficiency heat dissipation while preventing energy waste caused by idling or premature activation of the coolant cooling and circulation device, thus reducing operating costs. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A front view schematic diagram of the liquid-cooled electric motor and generator provided by the present invention; Figure 2 A rear view schematic diagram of the liquid-cooled electric motor and generator provided by the present invention; Figure 3 A schematic diagram of the liquid-cooled electric motor and generator provided by the present invention after removing the fan cover; Figure 4 A partial cross-sectional view of the liquid-cooled electric motor and generator provided by the present invention. Figure 1 ; Figure 5 A partial cross-sectional view of the liquid-cooled electric motor and generator provided by the present invention. Figure 2 ; Figure 6 A cross-sectional view of the cooling motor provided by the present invention; Figure 7 A schematic diagram of the coolant cooling and circulation device; Figure 8 A schematic diagram of a cooling and circulation device for the coolant where the main unit is installed; Figure 9 Longitudinal sectional view of the coolant cooling and circulation device; Figure 10 A longitudinal sectional view of the coolant cooling and circulation device on which the main unit is installed; Figure 11 A partial structural schematic diagram of the cooling motor provided by the present invention; Figure 12 This is a schematic diagram of the installation of the motor power monitoring sensor in this invention; Figure 13 This is a schematic diagram of the host structure in this invention; Figure 14 This is a schematic diagram of the droplet trap in this invention; Figure 15 This is a schematic diagram of the gap between two adjacent droplet collecting plates in this invention; Figure 16 A schematic diagram of a liquid-cooled electric motor and generator that includes multiple cooling motors; In the diagram: 100. Liquid-cooled motor and generator; 1. Cooling motor; 101. Motor body; 102. Motor coolant passage; 103. Air-cooled heat dissipation structure; 104. Heat sink; 105. Cooling fan; 106. Annular inlet channel; 107. Annular outlet channel; 108. Axial channel; 109. Fan cover; 110. Front cover; 111. Shaft; 112. Motor housing; 113. Stator; 114. Rotor; 2. Coolant cooling and circulation device; 201. Cooling shell; 202. Circulation pump; 203. Spray assembly; 204. Cooling fan; 205. Fan drive device; 206. Coolant outlet; 207. Coolant inlet; 208. Liquid inlet channel; 209. Packing material; 210. Droplet collector; 211. Injection platform; 212. Replenishment tank; 213. Coolant temperature monitoring device; 214. Receiving trough; 215. Air inlet; 216. Coolant annular inlet pipe; 217. Spray pipe; 218. Spray nozzle; 219. Liquid level window; 220. Discharge nozzle; 221. Discharge nozzle cover; 3. Motor temperature monitoring device; 4. Main unit; 401. Upper slot; 402. Lower slot; 5. Motor power monitoring sensor. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "center," "longitudinal," "transverse," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "clockwise," and "counterclockwise," etc., indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the 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 invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, it should be noted that in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0022] The purpose of this invention is to provide a liquid-cooled electric motor and generator to solve the problems existing in the prior art. It can achieve high-efficiency heat dissipation, ensure heat dissipation effect, and prevent energy waste caused by coolant cooling and idling loss or premature intervention of the circulation device, thereby reducing operating costs.
[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0024] like Figures 1-16 As shown, the present invention provides a liquid-cooled electric motor and generator 100, including at least one cooling motor 1, and further including a coolant cooling and circulation device 2, a motor temperature monitoring device 3, and a host 4. The coolant cooling and circulation device 2 and the motor temperature monitoring device 3 are both at least one. Each cooling motor 1 includes a motor body 101 and a motor coolant channel 102 and an air-cooled heat dissipation structure 103 disposed on the motor body 101. The inlet and outlet of the motor coolant channel 102 are respectively connected to the outlet and inlet of a coolant cooling and circulation device 2. At least one motor temperature monitoring device 3 is connected to each cooling motor 1, and each motor temperature monitoring device 3 is used to monitor the temperature of the corresponding cooling motor 1. Each motor temperature monitoring device 3 is communicatively connected to the host 4, and the host 4 can control the coolant cooling and circulation device 2 to introduce coolant into the motor coolant channels 102 of N cooling motors 1 and perform cooling circulation according to the motor temperature detected by the motor temperature monitoring device 3, where N is an integer greater than or equal to 0.
[0025] The air-cooled heat dissipation structure 103 is used to dissipate the heat of the motor body 101 into the air. When the temperature of all motors is low, the host 4 controls the coolant cooling and circulation device 2 to be turned off, and all motor bodies 101 are cooled only through the air-cooled heat dissipation structure 103 (at this time, N equals 0); when the temperature of one or more (greater than or equal to 2) motors exceeds the preset temperature threshold, the host 4 controls the coolant cooling and circulation device 2 to be turned on, so that coolant is introduced into the motor body 101 or all motor bodies 101 with excessively high temperature for liquid cooling heat dissipation. This invention achieves adaptive heat dissipation of the motor by timely activation of the coolant cooling and circulation device 2, which can achieve high-efficiency heat dissipation, ensure heat dissipation effect, and prevent energy waste caused by idling loss or premature intervention of the coolant cooling and circulation device 2, thereby reducing operating costs.
[0026] In some specific embodiments, when the motor temperature of the cooling motor 1 is greater than or equal to the preset temperature threshold of the corresponding cooling motor 1, it is called the motor to be cooled 1; the host 4 can control the coolant cooling and circulation device 2 to introduce coolant into the motor to be cooled 1 or all the cooling motors 1 and perform cooling circulation when the temperatures of M cooling motors 1 are respectively greater than or equal to the preset temperature threshold of the corresponding cooling motor 1, where M is an integer greater than or equal to 1; or, the host 4 can control the coolant cooling and circulation device 2 to introduce coolant into all the cooling motors 1 and perform cooling circulation when the average temperature of all the cooling motors 1 is greater than or equal to the preset average temperature threshold.
[0027] In some specific embodiments, each coolant cooling and circulation device 2 includes a cooling housing 201, a circulation pump 202, a spray assembly 203, a cooling fan 204, and a fan drive device 205. The inlet of each circulation pump 202 is connected to the coolant outlet 206 of the corresponding cooling housing 201, and the outlet of each circulation pump 202 is connected to the inlet of at least one motor coolant channel 102. The coolant inlet 207 of each cooling housing 201 is connected to the outlet of at least one motor coolant channel 102. Each cooling housing 201 is provided with multiple liquid inlet channels 208. The lower end of each 208 channel is connected to the coolant inlet 207 of the corresponding cooling housing 201. The upper end of each liquid inlet channel 208 is connected to at least one spray assembly 203. Each spray assembly 203 is connected inside the cooling housing 201 and is used to spray coolant. Each cooling housing 201 is fixedly connected to a fan drive device 205. The output end of each fan drive device 205 is connected to the corresponding cooling fan 204 and can drive the corresponding cooling fan 204 to rotate. Each circulation pump 202 is electrically connected to the host 4, and the host 4 can control the start and stop of each circulation pump 202. When the air-cooled heat dissipation structure 103 cannot meet the heat dissipation requirements of the motor, the host 4 can control the circulation pump 202 to start the liquid cooling circulation. The spray assembly 203 breaks the coolant into countless small droplets, increasing the specific surface area in contact with air. The cooling fan 204 forces airflow, enhancing the evaporative cooling of the coolant. That is, after the motor heat is carried away by the coolant, it is dissipated into the air by the cooling fan 204 and carried away by the air. The combined effect of the spray assembly 203 and the fan drive device 205 improves the cooling efficiency. The upper liquid channel 208 extends the liquid flow path and is located on the side wall of the cooling housing 201. As the coolant flows along the upper liquid channel 208, it can exchange heat with the air, providing a certain cooling effect and further improving the cooling efficiency.
[0028] In some specific embodiments, each coolant cooling and circulation device 2 further includes a packing material 209 fixedly connected within the corresponding cooling housing 201, and each spray assembly 203 is capable of spraying coolant onto the corresponding packing material 209. The packing material 209 can provide a large, structured contact surface for the coolant and air within a limited space, enhancing the heat transfer process and improving the heat dissipation effect.
[0029] In some specific embodiments, each coolant cooling and circulation device 2 further includes a droplet collector 210 fixedly connected within the corresponding cooling housing 201. Each droplet collector 210 is located at the opening of the corresponding cooling housing 201 and includes multiple radially spaced droplet collecting plates. Each droplet collecting plate is wavy along its length and width. The droplet collecting plates are thin metal sheets. As air flows through the wavy gap formed between the two wavy plates, the droplet collector 210 enhances airflow turbulence by utilizing the formed tortuous wavy flow channel, enabling it to capture more fine droplets drifting with the airflow during operation and suppressing coolant loss. Simultaneously, gaseous coolant can condense on the droplet collector 210 to further reduce coolant loss.
[0030] In some specific embodiments, each cooling housing 201 has an opening at its top, and a cooling fan 204 is installed at the opening of each cooling housing 201; each packing 209 is located below the corresponding spray assembly 203; each cooling housing 201 has an air inlet 215 on its side wall, and the air inlet 215 of each cooling housing 201 is located below the corresponding packing 209. Coolant enters the upper spray device through the upper liquid conduit and is sprayed downwards by the spray device; air enters the cavity inside the cooling housing 201 through the air inlet 215 and is discharged from the top of the cooling housing 201 under the action of the cooling fan 204. Under the flow of air, the coolant, which is broken into droplets, is cooled, and the downward dripping droplets form an efficient countercurrent heat exchange with the upward air, improving the heat dissipation effect.
[0031] In some specific embodiments, each coolant cooling and circulation device 2 further includes a liquid injection platform 211 and a liquid replenishment tank 212. The liquid outlet of each liquid injection platform 211 is connected to the inner cavity of the corresponding cooling housing 201, and the liquid outlet of each liquid replenishment tank 212 is connected to the liquid inlet of the corresponding liquid injection platform 211. The coolant outlet 206 of each cooling housing 201 is lower than the liquid inlet of the corresponding liquid injection platform 211.
[0032] In some specific embodiments, each coolant cooling and circulation device 2 also includes a coolant temperature monitoring device 213 that is communicatively connected to the host 4. Coolant temperature monitoring devices 213 are provided at both the coolant inlet and coolant outlet 206 of the coolant cooling and circulation device 2. Each cooling fan 204 is connected to the host 4, and the host 4 can adjust the speed of the corresponding cooling fan 204 according to the coolant temperature detected by each coolant temperature monitoring device 213.
[0033] In some specific embodiments, the air-cooled heat dissipation structure 103 includes heat sinks 104 disposed on the motor housing 112 of the cooling motor 1 and / or a cooling fan 105 fixedly connected to the rotating shaft 111 of the cooling motor 1.
[0034] In some specific embodiments, the motor coolant channel 102 includes an annular inlet channel 106, an annular outlet channel 107, and an axial channel 108 extending along the axial direction of the corresponding motor body 101. The annular inlet channel 106 and the annular outlet channel 107 of each cooling motor 1 are respectively disposed at both ends of the corresponding motor body 101. Multiple axial channels 108 are disposed between the annular inlet channel 106 and the annular outlet channel 107 of each cooling motor 1. The two ends of each axial channel 108 are respectively connected to the corresponding annular inlet channel 106 and the annular outlet channel 107. Each cooling fan 105 is disposed at one end of the corresponding motor body 101 where the annular outlet channel 107 is disposed, and each cooling fan 105 can cool the coolant in the corresponding annular outlet channel 107.
[0035] In some specific embodiments, the motor temperature monitoring device 3 is installed on the inner wall of the motor housing 112 to monitor the internal temperature of the liquid-cooled motor.
[0036] In some specific embodiments, the inlet of the motor coolant channel 102 is connected to the outlet of the circulating pump 202 via a pipeline, and the outlet of the motor coolant channel 102 is connected to the coolant inlet 207 of the cooling housing 201 via a pipeline.
[0037] In some specific embodiments, the main unit 4 is provided with an upper slot 401 and a lower slot 402. The main unit 4 is located near the coolant inlet 207 and coolant outlet 206 of the cooling housing 201. The upper slot 401 is fastened to the pipeline communicating with the coolant outlet 206, and the lower slot 402 is fastened to the pipeline communicating with the coolant inlet 207.
[0038] In some specific embodiments, each coolant cooling and circulation device 2 may have only one set of coolant inlet 207, coolant outlet 206, circulation pump 202, and coolant temperature monitoring device 213. The outlet of a single circulation pump 202 is connected to the inlet of the motor coolant channel 102 of multiple liquid-cooled motors via pipelines, and the coolant inlet 207 of a single coolant cooling and circulation device 2 is connected to the outlet of the motor coolant channel 102 of multiple liquid-cooled motors via pipelines, forming a parallel coolant circulation path. Alternatively, the motor coolant channels 102 of multiple liquid-cooled motors can be connected in series, with the inlet of the first motor coolant channel 102 connected to the outlet of a single circulation pump 202, and the outlet of the last motor coolant channel 102 connected to the coolant inlet 207 of a single coolant cooling and circulation device 2, forming a series coolant circulation loop.
[0039] In some specific embodiments, the coolant inlet 207 and coolant outlet 206 of the coolant cooling and circulation device 2, the circulation pump 202, and the coolant temperature monitoring device 213 can also be configured as multiple units, the same number as the liquid-cooled motors. The outlet of each circulation pump 202 is connected to the inlet of the motor coolant channel 102 of the corresponding liquid-cooled motor through a pipeline, and the coolant inlet 207 of each coolant cooling and circulation device 2 is connected to the outlet of the corresponding motor coolant channel 102 through a pipeline, thus forming a multi-pump parallel coolant circulation loop in which a single circulation pump 202 corresponds to a single liquid-cooled motor.
[0040] In some specific embodiments, the liquid-cooled motor and generator 100 also include a motor power monitoring sensor 5, which is fixed to the wiring terminals of the motor housing 112. The motor power monitoring sensor 5 can monitor the power of the motor in real time. When the motor is under extreme conditions such as prolonged continuous overload or severe overload, it can automatically shut down the motor to prevent the motor from overheating and burning out.
[0041] In some specific embodiments, the cooling motor 1 further includes a fan cover 109, and the motor body 101 further includes a front cover 110, a rotating shaft 111, a motor housing 112, a stator 113, and a rotor 114. The stator 113 and the rotor 114 are located inside the motor housing 112. The stator 113 is fastened to the inner wall of the motor housing 112, and the rotor 114 is fastened to the outer side of the rotating shaft 111. The rear end of the rotating shaft 111 is rotatably connected to the rear end of the motor housing 112 through a bearing. The front cover 110 is fastened to the front end of the motor housing 112 through bolts. The front end of the rotating shaft 111 is rotatably connected to the front cover 110 through a bearing. The fan cover 109 is fastened to the rear end of the motor housing 112. The cooling fan 105 is fastened to the rear end of the rotating shaft 111 at the position between the rear side of the motor housing 112 and the fan cover 109. The motor temperature monitoring device 3 is fastened to the inner wall of the front end of the motor housing 112.
[0042] In some specific embodiments, heat sinks 104 are provided around the motor housing 112, and iron sheets are welded to the upper part between some adjacent heat sinks 104, which together with the outer wall of the motor housing 112 form a hollow tubular axial channel 108 of heat sink 104-outer wall of motor housing 112-upper iron sheet. A motor annular liquid inlet pipe is tightly fitted to the front end of the outer wall of the motor housing 112. The internal channel of the motor annular liquid inlet pipe is an annular liquid inlet channel 106. The motor annular liquid inlet pipe is connected to the front end of the axial channel 108. A motor coolant inlet 207 is provided at the top of the motor annular liquid inlet pipe. A motor annular liquid outlet pipe is tightly fitted to the rear end of the motor housing 112, located in front of the cooling fan 105. The internal channel of the motor annular liquid outlet pipe is an annular liquid outlet channel 107. The motor annular liquid outlet pipe is connected to the rear end of the axial channel 108. A motor coolant outlet 206 is provided on the side of the motor annular liquid outlet pipe. The motor coolant outlet 206 passes through a hole provided on the side of the fan cover 109 and reaches the interior of the fan cover 109.
[0043] In some specific embodiments, the coolant cooling and circulation device 2 further includes a cooling motor mount, and the fan drive device 205 is a motor. The fan drive device 205 is fastened to the cooling motor mount provided on the top of the cooling housing 201, the cooling fan 204 is fastened to the output shaft of the fan drive device 205, the liquid collector is fastened to the upper part of the inner cavity of the cooling housing 201, located below the cooling fan 204, and the packing 209 is fastened to the middle part of the inner cavity of the cooling housing 201, located below the spray pipe 217 and spray nozzle 218 of the spray assembly 203 and above the air inlet 215. The bottom of the cooling housing 201 is a liquid receiving tank 214, and the liquid inlet of the circulation pump 202 is connected to the coolant outlet 206 provided at the bottom of the liquid receiving tank 214.
[0044] In some specific embodiments, an air inlet 215 is provided above the liquid receiving tank 214. Above the air inlet 215 is the outer shell body. A coolant annular inlet pipe 216 is provided at the bottom of the outer periphery of the outer shell body, above the air inlet 215. A coolant inlet 207 of the coolant cooling and circulation device 2 is provided on the side of the coolant annular inlet pipe 216. Above the coolant annular inlet pipe 216, at the outer periphery of the outer shell body, several liquid-filling conduits perpendicular to the coolant annular inlet pipe 216 are provided. The internal channels of the liquid-filling conduits are liquid-filling channels 208. The spray assembly 203 includes spray pipes 217 and spray nozzles 218. A ring of horizontal spray pipes 217, the same number as the upper liquid supply pipes and located on the same plane, is arranged in the upper part of the inner wall of the main body. Multiple spray nozzles 218 are installed on the spray pipes 217, and the internal connections between the coolant annular inlet pipe 216, the upper liquid supply pipe, and the spray nozzles 218 are continuous. The outlet nozzle 220 located below the replenishment tank 212 is inserted into the injection port located at the top of the injection platform 211.
[0045] In some specific embodiments, a coolant outlet 206 is provided at the bottom of the side of the liquid receiving tank 214, and a hollow liquid injection platform 211 communicating with the inside of the liquid receiving tank 214 is provided on its side. A liquid level viewing window 219 is provided on the side of the liquid injection platform 211, and a liquid injection port is provided on the top of the liquid injection platform 211.
[0046] In some specific embodiments, the replenishment tank 212 has a six-plate box structure, with the top plate and bottom plate respectively provided with the same shape of liquid outlet 220, and a liquid outlet cover 221 screwed onto one of the liquid outlet 220 located on the top.
[0047] In some specific embodiments, the host 4 is provided with two coolant temperature monitoring devices 213. One coolant temperature monitoring device 213 is located between the inner wall of the upper slot 401 and the outer wall of the coolant inlet 207 pipe, and the other coolant temperature monitoring device 213 is located between the inner wall of the lower slot 402 and the outer wall of the coolant outlet 206 pipe, and the two coolant temperature monitoring devices 213 are respectively fastened to the outer surface of the coolant inlet 207 pipe and the coolant outlet 206 pipe.
[0048] In some specific implementations, the number of liquid-cooled motors can be increased or decreased as needed.
[0049] During operation, each liquid-cooled motor, main unit 4, circulating pump 202, and fan drive unit 205 are connected to an external power source for power supply. The coolant tank 212 is removed, and coolant such as ethylene glycol solution or water is added through the injection port. After the coolant is added, the coolant tank 212 is removed and filled. Then, the outlet 220 is inserted into the injection port, so that the lower part of the outlet 220 is immersed in the coolant. Alternatively, without removing the coolant tank 212, the outlet cap 221 of the upper outlet 220 is unscrewed, and coolant is quickly added along the upper outlet 220. When the coolant overflows the bottom of the lower outlet 220, continue to add coolant quickly until the coolant tank 212 is full. Then, as the liquid slowly flows out from the lower outlet 220, quickly tighten the outlet cap 221.
[0050] During the operation of the liquid-cooled motor, the cooling fan 105 rotates along with the shaft 111. Simultaneously, the motor temperature monitoring device 3 monitors the internal temperature of the liquid-cooled motor, and the liquid temperature monitoring mechanism monitors the liquid temperature at the coolant outlet 206 and coolant inlet 207, transmitting this information to the host unit 4. When the coolant circulation loop structure is a parallel or series coolant circulation path, the host unit 4 receives the internal temperature information of the liquid-cooled motor from the motor temperature monitoring device 3, takes its average value, and can set a temperature threshold on the host unit 4. When the average temperature of multiple liquid-cooled motors exceeds this threshold or a single liquid-cooled motor overheats, the host unit 4 controls the coolant to cool down and the circulation device 2 to start operation. The circulation pump 202 and the fan drive device 205 start simultaneously. The coolant is pumped out through the outlet of the circulation pump 202, enters the motor coolant inlet 207 along the pipeline, and is then transported to each axial channel 108 through the motor annular inlet pipe. It flows along the axial channel 108 to the motor annular outlet pipe and exits through the motor annular outlet pipe. The coolant flows out of outlet 206, enters the coolant inlet 207 of the coolant cooling and circulation device 2 along the pipeline, and then enters the coolant annular inlet pipe 216. From there, it is transported to each upper liquid guide pipe, enters the spray pipe 217 along the upper liquid guide pipe, and is then sprayed out by the spray nozzle 218. At this time, the fan drive device 205 is driving the cooling fan 204 to rotate, causing air to be drawn in through the air inlet 215 and sequentially pass through the packing 209, spray pipe 217, spray nozzle 218, and liquid collector, before exiting through the cooling housing. The coolant is blown out through the opening at the top of 201. When the coolant is sprayed out through the spray nozzle 218, it is in the form of droplets and falls into the packing 209 under the action of gravity. During this process, the outside air drawn in by the cooling fan 204 cools the coolant. The coolant then falls from the packing 209 into the receiving tank 214, and under the suction of the circulating pump 202, it is pumped out again through the outlet of the circulating pump 202 along the coolant outlet 206 and the inlet of the circulating pump 202, reaching the liquid-cooled motor and completing one coolant loop cycle. During the cooling process of the coolant cooling and circulation device 2, a decrease in coolant level is inevitable. Therefore, a coolant collector is installed on its upper part. When the coolant level drops to a certain point, and the liquid level in the receiving tank 214 becomes too low, falling below the outlet 220 below the replenishment tank 212, the coolant stored in the replenishment tank 212 automatically flows into the receiving tank 214 under atmospheric pressure, automatically replenishing the receiving tank 214 until the liquid level in the receiving tank 214 is once again level with the bottom of the outlet 220. This eliminates the need for frequent manual shutdowns for replenishment. This invention utilizes counter-current cooling and direct contact between the coolant and the air entering through the air inlet 215 for heat dissipation, resulting in good heat dissipation performance.
[0051] If the average temperature inside the liquid-cooled motor does not reach the threshold or there is no case of an individual liquid-cooled motor overheating, the coolant circulation and cooling device will not operate. The heat dissipation of the liquid-cooled motor will rely solely on the cooling fan 105 and the heat sink 104. When the coolant circulation loop structure is a multi-pump parallel coolant circulation loop, multiple temperature thresholds for the liquid-cooled motors can be set on the host 4. When the temperature of a single liquid-cooled motor exceeds the corresponding threshold, the host 4 controls the corresponding coolant cooling and circulation device 2 to start working, and the fan drive device 205 will always be working. In the multi-pump parallel coolant circulation loop, the working mode of the coolant cooling and circulation device 2 is different from that of the parallel coolant circulation path or the series coolant circulation loop. When the temperature of a single liquid-cooled motor exceeds the threshold, only the circulation pump 202 corresponding to the overheated motor will work, while the circulation pumps 202 of the other motors will not work. To prevent coolant from flowing into the other motors through the other non-working circulation pumps 202, a check valve that allows liquid to flow into the inlet of the circulation pump 202 can be installed at the inlet of the circulation pump 202 in this structure. When the coolant cooling and circulation device 2 is working, the coolant temperature monitoring device 213 monitors the temperature of the coolant entering and exiting the coolant cooling and circulation device 2 and transmits it to the host 4. The liquid heat dissipation effect of the coolant cooling and circulation device 2 can be evaluated by the temperature difference between the coolant inlet 207 and the coolant outlet 206, thereby controlling the speed of the fan drive device 205. For example, when the temperature difference between the coolant inlet 207 and the coolant outlet 206 is small, the host 4 can control the speed of the fan drive device 205 to increase; for example, when the temperature difference between the coolant inlet 207 and the coolant outlet 206 is large, the host 4 can control the speed of the fan drive device 205 to decrease.
[0052] Furthermore, during operation, the motor power monitoring sensor 5 can monitor the motor power in real time. Before operation, the rated power, maximum overload time, and severe overload threshold of the motor are pre-input into the host 4. When the motor is overloaded or severely overloaded for a long time, the motor power monitoring sensor 5 transmits the signal to the host 4, causing the corresponding overloaded motor to stop.
[0053] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.
Claims
1. A liquid-cooled electric motor and generator, comprising at least one cooled motor, characterized in that: It also includes a coolant cooling and circulation device, a motor temperature monitoring device, and a main unit. There is at least one coolant cooling and circulation device and one motor temperature monitoring device. Each cooling motor includes a motor body and a motor coolant channel and a wind-cooled heat dissipation structure disposed on the motor body. The inlet and outlet of the motor coolant channel are respectively connected to the outlet and inlet of one of the coolant cooling and circulation devices. At least one motor temperature monitoring device is connected to each cooling motor, and each motor temperature monitoring device is used to monitor the temperature of the corresponding cooling motor. Each motor temperature monitoring device is communicatively connected to the main unit, and the main unit can control the coolant cooling and circulation device to circulate coolant into the motor coolant channels of N cooling motors and perform cooling circulation based on the motor temperature detected by the motor temperature monitoring device, where N is an integer greater than or equal to 0.
2. The liquid-cooled electric motor and generator according to claim 1, characterized in that: The motor temperature of the cooling motor is defined as a motor to be cooled when it is greater than or equal to the preset temperature threshold of the corresponding cooling motor. The host can control the coolant cooling and circulation device to introduce coolant into the motor to be cooled or all the cooling motors and perform cooling circulation when the temperatures of M cooling motors are respectively greater than or equal to the preset temperature threshold of the corresponding cooling motors, where M is an integer greater than or equal to 1; or, the host can control the coolant cooling and circulation device to introduce coolant into all the cooling motors and perform cooling circulation when the average temperature of all the cooling motors is greater than or equal to the preset average temperature threshold.
3. The liquid-cooled electric motor and generator according to claim 1, characterized in that: Each of the aforementioned coolant cooling and circulation devices includes a cooling housing, a circulation pump, a spray assembly, a cooling fan, and a fan drive device. The inlet of each circulation pump is connected to the coolant outlet of the corresponding cooling housing, and the outlet of each circulation pump is connected to the inlet of at least one motor coolant channel. The coolant inlet of each cooling housing is connected to the outlet of at least one motor coolant channel. Each cooling housing has multiple liquid inlet channels, the lower end of each liquid inlet channel is connected to the coolant inlet of the corresponding cooling housing, and the upper end of each liquid inlet channel is connected to and communicates with at least one spray assembly. Each spray assembly is connected inside the cooling housing and is used to spray the coolant. Each cooling housing is fixedly connected to a fan drive device, the output end of each fan drive device is connected to the corresponding cooling fan and can drive the corresponding cooling fan to rotate. Each circulation pump is connected to the main unit, and the main unit can control the start and stop of each circulation pump.
4. The liquid-cooled electric motor and generator according to claim 3, characterized in that: Each of the coolant cooling and circulation devices further includes packing material fixedly connected in the corresponding cooling housing, and each of the spraying components can spray the coolant onto the corresponding packing material.
5. The liquid-cooled electric motor and generator according to claim 4, characterized in that: Each of the cooling housings has an opening at its top, and a cooling fan is provided at the opening of each of the cooling housings; each of the packing materials is located below the corresponding spray assembly; each of the cooling housings has an air inlet on its side wall, and the air inlet of each of the cooling housings is located below the corresponding packing material.
6. The liquid-cooled electric motor and generator according to claim 5, characterized in that: Each of the coolant cooling and circulation devices further includes a droplet collector fixedly connected to the corresponding cooling housing. Each droplet collector is disposed at the opening of the corresponding cooling housing. Each droplet collector includes a plurality of droplet collecting plates that are radially spaced apart. Each droplet collecting plate is wavy along its own length direction and wavy along its own width direction.
7. The liquid-cooled electric motor and generator according to claim 3, characterized in that: Each of the coolant cooling and circulation devices further includes a liquid injection platform and a liquid replenishment tank. The outlet of each liquid injection platform is connected to the inner cavity of the corresponding cooling housing. The outlet of each liquid replenishment tank can be connected to the inlet of the corresponding liquid injection platform. The coolant outlet of each cooling housing is lower than the inlet of the corresponding liquid injection platform.
8. The liquid-cooled electric motor and generator according to claim 3, characterized in that: Each of the coolant cooling and circulation devices further includes a coolant temperature monitoring device that is communicatively connected to the host. The coolant temperature monitoring device is installed at both the coolant inlet and the coolant outlet of the coolant cooling and circulation device. Each of the cooling fans is connected to the host, and the host can adjust the speed of the corresponding cooling fan according to the coolant temperature detected by each of the coolant temperature monitoring devices.
9. The liquid-cooled electric motor and generator according to claim 1, characterized in that: The air-cooled heat dissipation structure includes heat sinks disposed on the motor housing of the cooling motor and / or a cooling fan fixedly connected to the shaft of the cooling motor.
10. The liquid-cooled electric motor and generator according to claim 9, characterized in that: The motor coolant channel includes an annular inlet channel, an annular outlet channel, and an axial channel extending along the axis of the corresponding motor body. The annular inlet channel and the annular outlet channel of each cooling motor are respectively located at both ends of the corresponding motor body. Multiple axial channels are provided between the annular inlet channel and the annular outlet channel of each cooling motor. The two ends of each axial channel are respectively connected to the corresponding annular inlet channel and the annular outlet channel. Each cooling fan is located at one end of the corresponding motor body where the annular outlet channel is located, and each cooling fan can cool the coolant in the corresponding annular outlet channel.