Motor medium oil temperature control system

Abstract

The utility model relates to the technical field of new energy motor detection, in particular to a motor medium oil temperature control system which comprises an oil tank used for storing medium oil, and the oil tank is communicated with a motor through an outer circulation pipeline and conveys the medium oil used for controlling the temperature of the motor. The outer circulation pipeline is communicated with the heating assembly and the cooling assembly, the heating assembly is used for heating medium oil, and the cooling assembly is used for cooling the medium oil. The medium oil with constant temperature is conveyed to the motor through the outer circulation pipeline, the property of the medium oil is stable and reliable, and stable operation of the motor can be kept; when the operating environment temperatures of the motor are different, the temperature of the medium oil can be adjusted through the heating assembly and the cooling assembly, and the temperature change required by the motor is met, so that the reliable operation of the motor is kept.

Description

Technical Field

[0001] This utility model relates to the field of new energy motor testing technology, specifically to a motor medium oil temperature control system. Background Technology

[0002] In the context of the rapid development of the new energy vehicle industry, vehicle drive motors are also constantly moving towards higher torque and power densities. With the increasing demand for higher power and torque densities, motor temperature rise has become the most difficult aspect to address. Currently, motor cooling can be divided into two main categories based on the cooling medium: air cooling and liquid cooling. Liquid cooling can be further subdivided into water cooling and oil cooling. Air cooling is currently only suitable for some low-power motors, while water cooling involves adding water channels within the motor housing to remove heat through heat exchange, and is currently the mainstream cooling method. However, since the high-temperature components of the motor are mainly concentrated at the winding ends, the circulating cooling water in water cooling is conductive and cannot directly contact the high-temperature parts or heat sources. The heat generated at the windings must pass through the slot insulation layer and the motor stator before being transferred to the outer casing to be carried away by the cooling water. This water cooling method has a long heat transfer path, and the fit tolerances between components affect the thermal resistance of the transfer path. Because of the thermal resistance, heat cannot be completely transferred from the windings to the water-cooled housing, resulting in a temperature gradient along the transfer path. The windings cannot be directly cooled, easily leading to heat accumulation and the formation of localized hot spots. At the same time, the presence of waterways also increases the size of the motor.

[0003] To address the drawbacks of water cooling, oil cooling has gradually gained traction in the market, and many automakers have already implemented oil cooling technology in their mass-produced vehicles. Compared to water cooling, oil cooling offers advantages because oil is non-conductive and non-magnetic, possessing excellent insulation properties. It can directly contact internal motor components, penetrating deep into the rotor and stator windings for more comprehensive heat exchange, resulting in higher heat dissipation efficiency. However, compared to a coolant temperature control system, oil cooling has the following problems:

[0004] 1. The kinematic viscosity of the oil changes at different temperatures. The lower the kinematic viscosity, the worse the oil's fluidity, which affects the actual performance of the motor.

[0005] 2. Because the kinematic viscosity and fluidity of the medium oil vary at different temperatures, a special PID algorithm is required to control the temperature within a precise range, which increases the difficulty of control.

[0006] Therefore, current motor oil cooling systems still have room for improvement and should be optimized to enhance the temperature control accuracy of the circulating oil, maintaining it within a reasonable temperature range to ensure its stability and reliability. Thus, a more reasonable technical solution is needed to address the existing technical problems. Utility Model Content

[0007] To overcome at least one of the aforementioned defects, this utility model proposes a motor medium oil temperature control system that heats the medium oil to meet the requirements of high-temperature motor operation and cools the medium oil to meet the requirements of low-temperature motor operation.

[0008] To achieve the above objectives, the oil-cooled temperature control system disclosed in this utility model can adopt the following technical solution:

[0009] An electric motor medium oil temperature control system includes an oil tank for storing medium oil, the oil tank being connected to a motor via an external circulation pipeline and supplying medium oil for controlling the motor temperature; the external circulation pipeline is connected to a heating component and a cooling component, the heating component being used to heat the medium oil, and the cooling component being used to cool the medium oil.

[0010] The temperature control system disclosed above regulates the temperature of the medium oil, such as engine oil, that can enter the motor, thereby maintaining a constant temperature of the medium oil. This ensures the stability of the medium oil's properties during motor testing and operation, resulting in stable motor operation. The heat generated during motor operation can be dissipated promptly with the engine oil, thus improving the motor's operational reliability.

[0011] Furthermore, during the transportation of the medium oil, the external circulation pipeline ensures that the medium oil smoothly reaches the motor from the oil tank, and simultaneously smoothly returns the medium oil from the motor to the oil tank, forming a circulation. The external circulation pipeline can achieve this process using various methods, and its structure is not limited to a single one. Here, we optimize and propose one feasible option: the external circulation pipeline includes an oil injection pipeline and an oil return pipeline. The oil injection pipeline is equipped with a circulation pump for pumping the medium oil to the motor, and the oil return pipeline is equipped with a pump for pumping the medium oil from the motor back to the oil tank. When adopting the above scheme, the circulation pump and the pump can be vacuum pumps.

[0012] Furthermore, the heating component is used to heat the medium oil to meet the high-temperature operation requirements of the motor. Various designs can be used for the heating component; here, we optimize and propose one feasible option: The heating component includes a heating tank, within which a medium oil pipeline and an electric heating element are installed. When the electric heating element is activated, the medium oil entering the medium oil pipeline within the heating tank is heated to the set temperature. In this design, the medium oil pipeline is arranged in a spiral pattern within the heating element, which improves the heating effect.

[0013] Furthermore, in order to determine the temperature of the medium oil, a temperature measurement scheme can be used to measure the temperature of the medium oil. The temperature measurement scheme can adopt various structures, and its structure is not limited to one. Here, we optimize and propose one feasible option: a temperature sensor is also installed at the heating tank to detect the temperature of the medium oil in the heating tank.

[0014] Furthermore, the cooling assembly is used to cool the medium oil, thereby meeting the low-temperature operation requirements of the motor, preventing the motor from operating at excessively high temperatures, and maintaining stable and reliable motor operation. The cooling assembly can adopt various schemes, and its structure is not limited to a single one. Here, we optimize and propose one feasible option: the cooling assembly includes a front-end heat exchanger, which is connected to a rear-end heat exchanger through cooling pipes. Cooling medium circulates in the cooling pipes, and the medium oil entering the external circulation pipes from the oil tank is cooled after flowing through the front-end heat exchanger. When adopting the above scheme, plate heat exchangers can be used for both the front-end and rear-end heat exchangers.

[0015] Furthermore, the heating and cooling components regulate the temperature of the medium oil in the external circulation pipeline. One of them can be activated at any time. The cooling component can be turned on or off by controlling the circulation path of the cooling medium. Its structure is not limited to a single type; here, we propose an optimization and one feasible option: a switching valve is installed on the cooling pipeline. When the switching valve is switched to the cooling position, the cooling medium in the cooling pipeline circulates into the front-end heat exchanger. When the switching valve is switched to the rest position, the cooling medium in the cooling pipeline flows back directly through the return bypass. In this scheme, the switching valve can be a three-way valve, forming a return bypass on the cooling pipeline at the front-end heat exchanger. The three-way valve controls the medium oil to enter the front-end heat exchanger for cooling and heat exchange, or to flow back directly through the return bypass.

[0016] Furthermore, the rear-end heat exchanger is used to cool and exchange heat with the cooling rings in the cooling pipeline, ensuring sufficient cooling capacity at the front-end heat exchanger. The structure of the rear-end heat exchanger can adopt various schemes and is not limited to a single one. Here, we optimize and propose one feasible option: the rear-end heat exchanger is set in a cooling medium tank. The cooling medium in the cooling medium tank enters the rear-end heat exchanger and is cooled to a set temperature. The rear-end heat exchanger transports the cooling medium to the front-end heat exchanger through cooling pipelines. The front-end heat exchanger is connected to the cooling medium tank through cooling pipelines and is used to return the cooled medium that has undergone heat exchange. With the above scheme, the cooling medium tank is equipped with corresponding pipelines connected to the rear-end heat exchanger, facilitating the transport of medium oil from the cooling medium tank to the rear-end heat exchanger.

[0017] Furthermore, the specific heat exchange of the cooling medium at the downstream heat exchanger can be achieved through various schemes. One feasible option is proposed here: the downstream heat exchanger is connected to a refrigeration system, which includes refrigeration piping, a compressor, and a condenser. A refrigerant medium circulates within the refrigeration piping. The refrigerant absorbs heat from the downstream heat exchanger and vaporizes. After passing through the compressor and condenser, it is cooled and liquefied again before circulating back to the downstream heat exchanger. Using this scheme, the refrigerant medium in the refrigeration piping absorbs heat from the cooling medium at the downstream heat exchanger, causing vaporization. This vaporization is then transported to the compressor for compression, forming a high-temperature liquid. After heat exchange in the condenser, it becomes a low-temperature liquid, and then recirculates back to the downstream heat exchanger to absorb heat and vaporize again, thus forming a circulating heat exchange.

[0018] Furthermore, the oil temperature control system disclosed in this utility model can be further optimized to achieve an integrated form: it includes a main frame, which forms an upper storage space and a lower storage space. The oil tank, heating component, and cooling component are arranged in the upper storage space, and the circulation pump and oil pump are arranged in the lower storage space. The main frame is covered with a shell, and the external circulation pipeline extends to the shell and forms an oil port connector for connecting to the motor.

[0019] Furthermore, a heat dissipation structure is formed on the top of the main frame. When the above solution is adopted, the heat dissipation structure works in conjunction with the refrigeration system, allowing the condenser of the refrigeration system to be positioned at the heat dissipation structure to assist in heat dissipation and promote cooling of the refrigerant.

[0020] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in this utility model include:

[0021] The motor is supplied with a constant-temperature medium oil through an external circulation pipeline. The medium oil is stable and reliable, which can maintain the stable operation of the motor. When the operating environment temperature of the motor is different, the temperature of the medium oil can be adjusted by the heating and cooling components to meet the temperature requirements of the motor, thereby maintaining the reliable operation of the motor. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the temperature control system.

[0024] Figure 2 A schematic diagram of the temperature control system from the front.

[0025] Figure 3 This is a rear view structural diagram of the temperature control system.

[0026] Figure 4 A schematic diagram of the overall structure of the temperature control system after removing the top heat dissipation structure and condenser.

[0027] Figure 5 A schematic diagram of the overall structure of the temperature control system from another perspective after removing the top heat dissipation structure and condenser.

[0028] Figure 6 This is a schematic diagram of the temperature control system.

[0029] In the above attached figures, the meanings of each label are as follows:

[0030] 1. Main frame; 101. Upper storage space; 102. Lower storage space; 103. Heat dissipation structure; 2. Oil tank; 3. Circulation pump; 4. Oil injection line; 5. Oil return line; 6. Oil pump; 7. Heating tank; 8. Front heat exchanger; 9. Cooling line; 10. Rear heat exchanger; 11. Switching valve; 12. Recirculation bypass; 13. Cooling medium tank; 14. Refrigeration line; 15. Compressor; 16. Liquid receiver; 17. Gas-liquid separator; 18. Oil separator; 19. Condenser; 20. Oil port connector. Detailed Implementation

[0031] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this embodiment.

[0032] In view of the fact that the temperature of the medium oil in the motor is difficult to adjust properly in the existing technology, which causes the temperature of the medium oil to change during the operation of the motor and thus affects the operation of the motor, the following embodiments are optimized and overcome the defects of the existing technology.

[0033] Example

[0034] like Figures 1-6 As shown, this embodiment provides a motor medium oil temperature control system, including an oil tank 2 for storing medium oil. The oil tank 2 is connected to the motor through an external circulation pipeline and supplies medium oil for controlling the motor temperature. The external circulation pipeline connects a heating component and a cooling component. The heating component is used to heat the medium oil, and the cooling component is used to cool the medium oil.

[0035] The temperature control system disclosed in this embodiment regulates the temperature of the medium oil, such as engine oil, that can enter the motor, thereby maintaining a constant temperature of the medium oil. This ensures the stability of the medium oil's properties during motor testing and operation, resulting in stable motor operation. The heat generated during motor operation can be dissipated promptly with the engine oil, thus improving the motor's operational reliability.

[0036] During the transportation of the medium oil, the external circulation pipeline ensures that the medium oil smoothly reaches the motor from the oil tank 2, and simultaneously smoothly returns the medium oil from the motor to the oil tank 2, forming a circulation. The external circulation pipeline can achieve this process using various methods, and its structure is not limited to a single approach. This embodiment optimizes and adopts one feasible option: such as... Figure 6 As shown, the external circulation pipeline includes an oil injection pipeline 4 and an oil return pipeline 5. The oil injection pipeline 4 is equipped with a circulation pump 3 for pumping the medium oil to the motor, and the oil return pipeline 5 is equipped with an oil extraction pump 6 for pumping the medium oil from the motor back to the oil tank 2. When using the above scheme, the circulation pump 3 and the oil extraction pump 6 can be vacuum pumps.

[0037] The heating element is used to heat the medium oil to meet the high-temperature operation requirements of the motor. Various heating elements can be used; this embodiment optimizes and adopts one feasible option: such as... Figure 6 As shown, the heating assembly includes a heating tank 7, which contains a medium oil pipeline and an electric heating element. When the electric heating element is activated, the medium oil entering the medium oil pipeline within the heating tank 7 is heated to a set temperature. In this configuration, the medium oil pipeline is arranged spirally within the heating element, which improves the heating effect.

[0038] To determine the temperature of the medium oil, a temperature measurement scheme can be used. Various structures can be employed for this scheme, and its structure is not limited to a single one. This embodiment optimizes and adopts one feasible option: such as... Figure 6 As shown, a temperature sensor is also installed at the heating tank 7 to detect the temperature of the medium oil inside the heating tank 7.

[0039] The cooling assembly is used to cool the medium oil, thereby meeting the low-temperature operation requirements of the motor, preventing the motor from overheating, and maintaining stable and reliable motor operation. Various cooling assembly designs can be adopted, and their structure is not limited to a single design. This embodiment optimizes and adopts one feasible option: such as... Figures 1-6 As shown, the cooling assembly includes a front-end heat exchanger 8, which is connected to a rear-end heat exchanger 10 via a cooling pipe 9. Cooling medium circulates in the cooling pipe 9. The oil medium entering the external circulation pipe from the oil tank 2 is cooled after passing through the front-end heat exchanger 8. When using the above scheme, the front-end heat exchanger 8 and the rear-end heat exchanger 10 can be plate heat exchangers.

[0040] The heating and cooling components regulate the temperature of the medium oil in the external circulation pipeline. One of them can be activated. The cooling component can be turned on or off by controlling the circulation path of the cooling medium. Its structure is not uniquely limited. This embodiment optimizes and adopts one feasible option: a switching valve 11 is installed on the cooling pipeline 9. When the switching valve 11 is switched to the cooling position, the cooling medium in the cooling pipeline 9 circulates into the front-end heat exchanger 8. When the switching valve 11 is switched to the rest position, the cooling medium in the cooling pipeline 9 flows directly back through the return bypass 12. With the above scheme, the switching valve 11 can be a three-way valve, forming a return bypass 12 on the cooling pipeline 9 at the front-end heat exchanger 8. The three-way valve controls the medium oil to enter the front-end heat exchanger 8 for cooling and heat exchange, or to flow back directly through the return bypass 12.

[0041] The rear heat exchanger 10 is used to cool and exchange heat with the cooling ring in the cooling pipe 9, ensuring sufficient cooling capacity at the front heat exchanger 8. The structure of the rear heat exchanger 10 can be configured in various ways and is not limited to a single design. This embodiment optimizes and adopts one feasible option: the rear heat exchanger 10 is located in the cooling medium tank 13. The cooling medium in the cooling medium tank 13 enters the rear heat exchanger 10 and is cooled to a set temperature. The rear heat exchanger 10 then transports the cooling medium to the front heat exchanger 8 through the cooling pipe 9. The front heat exchanger 8 is connected to the cooling medium tank 13 through the cooling pipe 9 and used to return the cooled medium after heat exchange. With this configuration, the cooling medium tank 13 has corresponding pipes connected to the rear heat exchanger 10, facilitating the transfer of medium oil from the cooling medium tank 13 to the rear heat exchanger 10.

[0042] When the cooling medium undergoes specific heat exchange at the rear heat exchanger 10, it can be achieved through various schemes. This embodiment adopts one feasible option: the rear heat exchanger 10 is connected to a refrigeration system, which includes a refrigeration pipeline 14. A compressor 15 and a condenser 19 are installed on the refrigeration pipeline 14. A refrigerant circulates within the refrigeration pipeline 14. The refrigerant absorbs heat from the rear heat exchanger 10 and vaporizes. After passing through the compressor 15 and condenser 19, it is cooled and liquefied again and circulated back to the rear heat exchanger 10. When the above scheme is adopted, the refrigerant in the refrigeration pipeline 14 absorbs heat from the cooling medium at the rear heat exchanger 10 and vaporizes, thereby being transported to the compressor 15 for compression to form a high-temperature liquid. It then undergoes heat exchange in the condenser 19 to form a low-temperature liquid, and then recirculates back to the rear heat exchanger 10 to absorb heat and vaporize again, thus forming a circulating heat exchange.

[0043] The oil temperature control system disclosed in this embodiment can be further optimized to achieve an integrated form: it includes a main frame 1, which forms an upper storage space 101 and a lower storage space 102. The oil tank 2, heating components and cooling components are disposed in the upper storage space 101, and the circulating pump 3 and the oil pump 6 are disposed in the lower storage space 102. The main frame 1 is covered with a shell, and the external circulation pipeline extends to the shell and forms an oil port connector 20 for connecting to the motor.

[0044] The top of the main frame 1 forms a heat dissipation structure 103. When the above solution is adopted, the heat dissipation structure 103 cooperates with the refrigeration system, and the condenser 19 of the refrigeration system can be set at the heat dissipation structure 103 to assist in heat dissipation and promote the cooling of the refrigerant.

[0045] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments under the guidance of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be defined in the claims.

Claims

1. A motor medium oil temperature control system, characterized in that: It includes an oil tank (2) for storing medium oil, the oil tank (2) is connected to the motor through an external circulation pipeline and supplies medium oil for controlling the motor temperature; the external circulation pipeline connects a heating component and a cooling component, the heating component is used to heat the medium oil, and the cooling component is used to cool the medium oil.

2. The motor medium oil temperature control system according to claim 1, characterized in that: The external circulation pipeline includes an oil injection pipeline (4) and an oil return pipeline (5). The oil injection pipeline (4) is equipped with a circulation pump (3) for pumping medium oil to the motor, and the oil return pipeline (5) is equipped with an oil pump (6) for pumping medium oil in the motor back to the oil tank (2).

3. The motor medium oil temperature control system according to claim 1, characterized in that: The heating component includes a heating tank (7), which is equipped with a medium oil pipeline and an electric heating tube. When the electric heating tube is activated, the medium oil enters the medium oil pipeline in the heating tank (7) and is heated to the set temperature.

4. The motor medium oil temperature control system according to claim 3, characterized in that: A temperature sensor is also provided at the heating tank (7) to detect the temperature of the medium oil inside the heating tank (7).

5. The motor medium oil temperature control system according to claim 1, characterized in that: The cooling assembly includes a front heat exchanger (8), which is connected to a rear heat exchanger (10) via a cooling pipe (9). Cooling medium circulates in the cooling pipe (9), and the medium oil entering the external circulation pipe from the oil tank (2) is cooled down after passing through the front heat exchanger (8).

6. The motor medium oil temperature control system according to claim 5, characterized in that: A switching valve (11) is installed on the cooling pipeline (9). When the switching valve (11) is switched to the cooling position, the cooling medium in the cooling pipeline (9) circulates into the front heat exchanger (8). When the switching valve (11) is switched to the rest position, the cooling medium in the cooling pipeline (9) flows back directly from the return bypass (12).

7. The motor medium oil temperature control system according to claim 5, characterized in that: The back-end heat exchanger (10) is located in the cooling medium tank (13). The cooling medium in the cooling medium tank (13) enters the back-end heat exchanger (10) and is cooled to the set temperature. The back-end heat exchanger (10) delivers the cooling medium to the front-end heat exchanger (8) through the cooling pipe (9). The front-end heat exchanger (8) is connected to the cooling medium tank (13) through the cooling pipe (9) and is used to return the cooled medium that has undergone heat exchange.

8. The motor medium oil temperature control system according to any one of claims 5 to 7, characterized in that: The back-end heat exchanger (10) is connected to the refrigeration system, which includes a refrigeration pipeline (14). A compressor (15) and a condenser (19) are installed on the refrigeration pipeline (14). A refrigerant is circulated in the refrigeration pipeline (14). The refrigerant absorbs the heat from the back-end heat exchanger (10) and then vaporizes. After passing through the compressor (15) and the condenser (19), it is cooled and liquefied again and circulated back to the back-end heat exchanger (10).

9. The motor medium oil temperature control system according to claim 2, characterized in that: Includes a main frame (1), which forms an upper storage space (101) and a lower storage space (102). The oil tank (2), heating component and cooling component are disposed in the upper storage space (101). The circulating pump (3) and oil pump (6) are disposed in the lower storage space (102). The main frame (1) is covered with a shell. The external circulation pipeline extends to the shell and forms an oil port connector (20) for connecting to the motor.

10. The motor medium oil temperature control system according to claim 9, characterized in that: A heat dissipation structure (103) is formed on the top of the main frame (1).

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