Evaluation device for the effect of cooling oil on the durability of the insulation system of an oil-cooled electric machine for vehicles

Abstract

The application belongs to the technical field of new energy automobile driving motor, and particularly relates to an evaluation device for the durability influence of cooling oil on the insulation system of an oil-cooled motor for vehicles. The device comprises a storage and temperature control module, a double-temperature aging experiment platform, a spraying assembly and an oil-cooled motor insulation system simulation structure, a spraying assembly comprising a ring-pack spraying device and two submerged self-rotating spraying terminals, the spraying assembly being connected with an oil-cooled circulation module, the two submerged self-rotating spraying terminals being oppositely arranged inside the ring-pack spraying device, one oil-cooled motor insulation system simulation structure being arranged on the opposite side of each of the two submerged self-rotating spraying terminals, and a heat exchange module. The application can simulate the thermodynamic situation of the oil-cooled driving motor of a new energy automobile under actual working conditions, consider the influence of cooling oil, and more accurately evaluate the durability of the insulation system.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle drive motor technology, specifically relating to an evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor. Background Technology

[0002] In new energy vehicles, the power characteristics and reliability of the motor are among the core elements. In recent years, with the rapid development of the new energy vehicle industry, oil-cooled drive motors have been widely used due to their high power density and excellent heat dissipation. The motor's insulation system is a crucial part of ensuring its normal operation, and the durability of the insulation system directly affects the motor's lifespan and safety. Durability assessment of the insulation system of oil-cooled drive motors is an important step in ensuring the safe operation of new energy vehicles. Generally speaking, during long-term operation, the motor's insulation system will gradually age due to factors such as high temperature, mechanical stress, and chemical corrosion, affecting the motor's reliability and lifespan.

[0003] However, traditional durability assessment methods for insulation systems often fail to adequately simulate the thermodynamic conditions of actual operation, especially the impact of cooling oil on insulation materials and the insulation system in oil-cooled systems. Most existing durability assessment methods do not fully consider the influence of cooling oil and cannot realistically simulate actual operating conditions, leading to significant discrepancies between assessment results and actual operating conditions, thus resulting in inaccurate assessments. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an evaluation device for assessing the impact of cooling oil on the durability of the insulation system of an oil-cooled motor in an automotive vehicle. This device can simulate the temperature field distribution of an oil-cooled drive motor in a new energy vehicle under actual operating conditions, while also considering the influence of the cooling oil, thus more accurately assessing the durability of the insulation system. When using this evaluation device to assess the insulation system of a spray-type direct oil-cooled motor, the effects of cooling oil and its complex additives on the durability of the insulation system under long-term high-temperature conditions can be examined in detail. This assessment can reveal how different types and compositions of cooling oil affect the aging process of insulation materials, thereby providing more accurate data to predict the motor's service life and stability. Such in-depth analysis helps optimize the design of the insulation system, select a more suitable combination of cooling oil and additives for long-term use, and thus improve the overall reliability and safety of the drive motor in new energy vehicles.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0006] The purpose of this invention is to provide an evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, comprising:

[0007] The storage and temperature control module is used to store the cooling oil and heat it to a preset temperature to form circulating oil. The circulating oil is then transported to the dual-temperature aging test platform through the oil cooling circulation module.

[0008] The dual-temperature aging test platform is used to simulate the oil-cooled circulation environment during motor operation. It conducts accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The dual-temperature aging test platform is equipped with a spray assembly and two simulated structures of the oil-cooled motor insulation system. The spray assembly includes a ring-shaped sprayer and two submerged self-rotating spray terminals, which are connected to the oil-cooling circulation module. The two submerged self-rotating spray terminals are positioned opposite each other inside the ring-shaped sprayer. On each side of the two submerged self-rotating spray terminals, there is an oil-cooled motor insulation system simulated structure. The ring-shaped sprayer uses circulating oil supplied by the oil-cooling circulation module to spray the outside of the two simulated structures of the oil-cooled motor insulation system. Each submerged self-rotating spray terminal uses circulating oil supplied by the oil-cooling circulation module to spray the inside of one simulated structure of the oil-cooled motor insulation system, thereby simulating the oil-cooled circulation environment during motor operation.

[0009] The heat exchange module is used to cool the circulating oil output from the dual-temperature aging test platform to form cooling oil, and then deliver the cooling oil to the storage and temperature control module.

[0010] Furthermore, in the aforementioned evaluation device for the impact of cooling oil on the durability of automotive oil-cooled motor insulation systems, the ring-shaped sprayer includes a U-shaped tube and two ring-shaped spray terminals. The inlet of the U-shaped tube is connected to the oil cooling circulation module. A sample holder is provided on the inner wall of the U-shaped tube on the side away from the oil cooling circulation module. Two simulated structures of the oil-cooled motor insulation system are symmetrically arranged at the upper and lower ends of the sample holder. The two ring-shaped spray terminals are symmetrically arranged along the axial direction of the sample holder on the two horizontal ends of the U-shaped tube. The two simulated structures of the oil-cooled motor insulation system are respectively located within the space formed by each ring-shaped spray terminal. Each ring-shaped spray terminal has a submerged self-rotating spray terminal connected to its inner wall. The two submerged self-rotating spray terminals are symmetrically distributed and located above and below the sample holder, respectively.

[0011] Furthermore, the aforementioned evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor includes a ring-shaped spray terminal comprising a horizontal spray terminal, two inclined spray terminals, and two vertical spray terminals. The middle of the inner wall of the horizontal spray terminal is connected to a ring-shaped sprayer. The upper end of each vertical spray terminal is connected to the horizontal spray terminal. The highest inclined ends of the two inclined spray terminals are connected to the two ends of the horizontal spray terminal, and the lowest inclined end of each inclined spray terminal is connected to a vertical spray terminal. The two inclined spray terminals and the two vertical spray terminals are symmetrically distributed about the ring-shaped sprayer as an axis.

[0012] Furthermore, the aforementioned device for evaluating the impact of cooling oil on the durability of automotive oil-cooled motor insulation systems includes a horizontal spray terminal comprising a connecting channel and a spray disc. One end of the connecting channel is connected to a horizontal end of a U-shaped tube, and the other end of the connecting channel is connected to the spray disc. The spray direction of the spray disc is towards the simulated structure of the oil-cooled motor insulation system, and is used to spray the outside of the coil of the simulated structure of the oil-cooled motor insulation system.

[0013] Furthermore, in the aforementioned evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the spray plate has multiple annular baffles arranged from the inside out. All annular baffles are concentric and arranged at equal gradients in the radial direction. The end of each annular baffle near the inner wall of the spray plate is connected to the inner side wall of the spray plate by a connecting rod, forming an annular space between adjacent annular baffles. The innermost annular space is provided with an outlet pipe, which is connected to a submersible self-rotating spray terminal. An annular flow groove is provided between the lower end of each annular baffle and the bottom wall of the spray plate. The annular flow groove is connected to a connecting channel and is used to circulate oil to all annular spaces. A cover is slidably provided on the spray plate, and multiple spray holes are evenly distributed on the cover located in the annular space.

[0014] Furthermore, in the aforementioned evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the lower sidewall of the cover is provided with a U-shaped groove and a second L-shaped plate. The second L-shaped plate includes a second vertical plate and a second horizontal plate. The upper end of the second vertical plate is connected to the lower wall of the cover, and the lower end is connected to one end of the second horizontal plate. The other end of the second horizontal plate is connected to one end of the U-shaped groove. The symmetrical sidewalls of the spray plate are each provided with a first L-shaped plate. The first L-shaped plate includes a first vertical plate and a first horizontal plate. One end of the first horizontal plate is connected to the inner wall of the spray plate, and the other end is connected to the upper end of the first vertical plate. The lower end of the first vertical plate is slidably disposed in the U-shaped groove.

[0015] Furthermore, in the aforementioned device for evaluating the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the two inner walls of the U-shaped groove are provided with a first arc-shaped groove, and the outer wall of the first vertical plate is provided with a second arc-shaped groove corresponding to the first arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are axially symmetrical and form a fixing hole. The fixing hole is provided with a threaded groove, and a T-shaped screw is screwed into each fixing hole.

[0016] Furthermore, the aforementioned device for evaluating the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor includes a connecting channel and a spray plate for both the inclined spray terminal and the vertical spray terminal. The spray plate has multiple annular baffles arranged from the inside out. All the annular baffles are concentric and arranged at equal gradients in the radial direction. An annular space is formed between adjacent annular baffles. A square spray nozzle is provided in the innermost annular space. Multiple spray holes are evenly distributed on the partial cover of the square spray nozzle.

[0017] Furthermore, in the aforementioned device for evaluating the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, each of the submersible self-rotating spray terminals includes an oil delivery pipe, an oil-throwing chamber, and multiple atomizing nozzles. The upper end of the oil delivery pipe is connected to the outlet pipe, and the lower end is connected to the oil-throwing chamber. Multiple atomizing nozzles are evenly distributed on the outer wall of the oil-throwing chamber along its radial direction.

[0018] Furthermore, the aforementioned evaluation device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor has multiple first guide baffles and multiple second guide baffles arranged in the circumferential direction of the oil slinger chamber, with at least two second guide baffles between adjacent first guide baffles.

[0019] Furthermore, in the aforementioned assessment device for the impact of cooling oil on the durability of automotive oil-cooled motor insulation systems, the dual-temperature aging chamber is equipped with a pressure sensor, a temperature sensor mounting base, a safety valve, and an oil outlet. The pressure sensor is used to detect the pressure inside the dual-temperature aging chamber and feed the pressure signal back to the oil cooling circulation system processing and control platform; the temperature sensor is used to detect the average temperature inside the dual-temperature aging chamber and feed the temperature signal back to the oil cooling circulation system processing and control platform; the safety valve is used to ensure that the pressure inside the dual-temperature aging chamber does not exceed the critical dangerous pressure limit; the oil outlet is connected to the cooling oil heat exchange module.

[0020] Furthermore, in the aforementioned assessment device for the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the storage and temperature control module includes an oil reservoir and a ceramic heating housing. The oil reservoir is located inside the ceramic heating housing, with its upper end connected to a heat exchange module and its lower end connected to an oil cooling circulation module.

[0021] Furthermore, the aforementioned assessment device for the impact of cooling oil on the durability of automotive oil-cooled motor insulation systems also includes an oil-cooling circulation system processing and control platform. This platform comprises a controller, a temperature control module, and a visualization display module. The visualization display module sets various operational data during the operation of the temperature control module, oil-cooling circulation module, dual-temperature aging test platform, and cooling oil heat exchange module. The controller and temperature control module collect these operational data, process them using preset algorithms and analysis models, and transmit the processed data to the temperature control module, oil-cooling circulation module, dual-temperature aging test platform, and cooling oil heat exchange module via the controller. This precisely regulates the operation of these modules to simulate the oil-cooling circulation environment during motor operation, ensuring a comprehensive and accurate assessment of the durability of the simulated structure of the oil-cooled motor insulation system.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (7) The device for evaluating the impact of cooling oil on the durability of the insulation system of an oil-cooled motor provided by the present invention uses a storage and temperature control module to store the cooling oil and heat it to a preset temperature to form circulating oil. The circulating oil is then transported to a dual-temperature aging test platform through an oil-cooling circulation module. The dual-temperature aging test platform is used to simulate the oil-cooling circulation environment during motor operation, to conduct accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system, and to transport the cooling oil to the storage and temperature control module to form a cycle test for durability evaluation. The dual-temperature aging test platform is equipped with a spray assembly, which uses a ring-shaped sprayer to spray the outside of the simulated structure of the oil-cooled motor insulation system, and two submersible self-rotating spray terminals to spray the inside of the simulated structure of the oil-cooled motor insulation system. The combination of the two sets of spray terminals realizes all-round, multi-angle, and three-dimensional spray cooling of the test object, ensuring precise and sufficient contact between the cooling oil and the simulated structure of the insulation system, which is beneficial to improving the accuracy of the durability evaluation of the oil-cooled motor insulation system by the cooling oil.

[0024] (8) This invention utilizes this device to conduct dual-temperature thermal aging tests, which can fully simulate the temperature difference between the cooling oil and the insulation system of the drive motor. This device can simulate the temperature field distribution of the oil-cooled drive motor of new energy vehicles under actual working conditions, and considering the influence of the cooling oil, it can more accurately assess the durability of the insulation system. When using this evaluation device to evaluate the insulation system of a spray-type direct oil-cooled motor, it can detect in detail the influence of the cooling oil and its complex additives on the durability of the insulation system under long-term high-temperature conditions, and has the advantages of accurate evaluation results, good repeatability, and high evaluation efficiency. This evaluation can reveal how different types and compositions of cooling oil affect the aging process of insulation materials, thereby providing more accurate data to predict the service life and stability of the motor. Such in-depth analysis helps to optimize the design of the insulation system, select cooling oils and additives more suitable for long-term use, and thus improve the overall reliability and safety of new energy vehicle motors.

[0025] (3) This invention can effectively evaluate the durability of the insulation system of oil-cooled drive motors for new energy vehicles, thereby providing a scientific basis for motor design optimization, material selection and life prediction, and further providing a reliable reference for motor research and development and production. It has rich potential for expansion and can adjust the pressure, flow rate, velocity and oil type of the spray system, providing experimental verification reference, evaluation and guidance for the design of oil-cooled motors. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the durability evaluation device for the oil-cooled drive motor insulation system of the present invention.

[0027] Figure 2This is a schematic diagram of the storage and temperature control module of the present invention.

[0028] Figure 3 This is a schematic diagram of the ring-shaped sprayer of the present invention.

[0029] Figure 4 This is a partial structural schematic diagram of the ring-shaped sprayer of the present invention.

[0030] Figure 5 This is a partial structural schematic diagram of the horizontal spray terminal of the present invention.

[0031] Figure 6 This is a schematic diagram of the overall structure of the horizontal spray terminal of the present invention.

[0032] Figure 7 This is a cross-sectional view of the horizontal spray terminal of the present invention.

[0033] Figure 8 This is a top sectional view of the horizontal spray terminal of the present invention.

[0034] Figure 9 This is a schematic diagram of the connection structure between the cover and the spray plate of the horizontal spray terminal of the present invention.

[0035] Figure 10 This is a schematic cross-sectional view of the cover structure of the horizontal spray terminal of the present invention.

[0036] Figure 11 This is a schematic diagram of the T-shaped screw of the present invention.

[0037] Figure 12 This is a partial structural schematic diagram of the inclined spray terminal or the vertical spray terminal of the present invention.

[0038] Figure 13 This is a cross-sectional structural diagram of the inclined spray terminal or the vertical spray terminal of the present invention.

[0039] Figure 14 This is a schematic diagram of the submersible self-rotating spray terminal of the present invention.

[0040] Figure 15 This is a schematic diagram of the structure of the first and second guide baffles in the oil-slinging chamber of the present invention.

[0041] Figure 16 This is a flowchart of the heat resistance evaluation and grading test of the dual-temperature aging method of the present invention. Detailed Implementation

[0042] 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.

[0043] It should be noted that the technical terms used in this invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased from the market or prepared by existing methods.

[0044] Traditional durability assessment methods for insulation systems often fail to adequately consider the influence of cooling oil, particularly its impact on insulation materials and the overall insulation system in oil-cooled systems. These methods cannot accurately simulate actual operating conditions and thermodynamic scenarios, leading to significant discrepancies between assessment results and real-world performance, thus resulting in inaccurate assessments. Therefore, developing a novel durability assessment device for oil-cooled drive motor insulation systems is of significant practical importance. Accurately assessing the durability of motor insulation systems under oil-cooling conditions is crucial not only for ensuring motor reliability and extending its service life but also for improving the safety and reliability of new energy vehicles.

[0045] To address the aforementioned problems, this invention provides an evaluation device for assessing the impact of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, such as... Figure 1 As shown, it includes:

[0046] The storage and temperature control module 2 is used to store the cooling oil and heat it to a preset temperature to form circulating oil. The circulating oil is then transported to the dual-temperature aging test platform 4 through the oil cooling circulation module 3.

[0047] The dual-temperature aging test platform 4 is used to simulate the oil-cooled circulation environment during motor operation, and to conduct accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The dual-temperature aging test platform 4 is equipped with a spray assembly 42 and two simulated structures of the oil-cooled motor insulation system 6. The spray assembly 42 includes a ring-shaped sprayer 421 and two submerged self-rotating spray terminals 422. The spray assembly 42 is connected to the oil-cooling circulation module 3. The two submerged self-rotating spray terminals 422 are arranged opposite each other inside the ring-shaped sprayer 421. Each side of the two submerged self-rotating spray terminals 422 is equipped with an oil-cooled motor insulation system simulated structure 6. The ring-shaped sprayer 421 uses the circulating oil supplied by the oil-cooling circulation module 3 to spray the outside of the two simulated structures of the oil-cooled motor insulation system 6. Each submerged self-rotating spray terminal 422 uses the circulating oil supplied by the oil-cooling circulation module 3 to spray the inside of one simulated structure of the oil-cooled motor insulation system 6, so as to realize the oil-cooled circulation environment during motor operation.

[0048] The heat exchange module 5 is used to cool the circulating oil output from the dual-temperature aging test platform 4 to form cooling oil, and then transport the cooling oil to the storage and temperature control module 2.

[0049] This invention utilizes a storage and temperature control module 2 to store cooling oil and heat it to a preset temperature to form circulating oil. This circulating oil is then transported to a dual-temperature aging test platform 4 via an oil-cooling circulation module 3. The dual-temperature aging test platform 4 simulates the oil-cooled circulation environment during motor operation, conducting accelerated aging and durability tests on the simulated oil-cooled motor insulation system structure. The simulated oil-cooled motor insulation system structure and the cooling oil operate continuously at two different temperatures. The circulating oil that has completed heat exchange with the simulated oil-cooled motor insulation system structure 6 is cooled by a heat exchange module 5 to form cooling oil, which is then transported back to the storage and temperature control module 2, forming a cycle to evaluate the durability of the simulated oil-cooled motor insulation system structure 6. This invention, using this device for dual-temperature thermal aging testing, can fully simulate the temperature difference between the cooling oil and the drive motor insulation system. This device can simulate the temperature field distribution of an oil-cooled drive motor in a new energy vehicle under actual operating conditions, taking into account the influence of the cooling oil, and more accurately assess the durability of the insulation system. When using this evaluation device to assess the insulation system of a spray-type direct oil-cooled motor, it can thoroughly examine the impact of cooling oil and its complex additives on the durability of the insulation system under long-term high-temperature conditions. It offers advantages such as accurate evaluation results, good repeatability, and high evaluation efficiency. This assessment can reveal how different types and compositions of cooling oil affect the aging process of insulation materials, thus providing more accurate data to predict the motor's service life and stability. Such in-depth analysis helps optimize the design of the insulation system, select more suitable combinations of cooling oil and additives for long-term use, and ultimately improve the overall reliability and safety of drive motors in new energy vehicles.

[0050] The following specific examples will provide further explanation.

[0051] Example 1

[0052] An evaluation device for assessing the impact of cooling oil on the durability of an automotive oil-cooled motor insulation system, such as... Figures 1 to 15 As shown, it includes:

[0053] Storage and temperature control module 2 is used to store cooling oil and heat it to a preset temperature to form circulating oil. The circulating oil is then transported to the dual-temperature aging test platform 4 via oil cooling circulation module 3. Dual-temperature aging test platform 4 is used to simulate the oil cooling circulation environment during motor operation, conducting accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. Dual-temperature aging test platform 4 is equipped with a spray assembly 42 and two simulated oil-cooled motor insulation systems 6. The spray assembly 42 includes a ring-shaped sprayer 421 and two submerged self-rotating spray terminals 422. The spray assembly 42 is connected to the oil cooling circulation module 3. The two submerged self-rotating spray terminals 422 are positioned opposite each other. Inside the ring-shaped sprayer 421, two submerged self-rotating spray terminals 422 are respectively provided with an oil-cooled motor insulation system simulation structure 6 on opposite sides. The ring-shaped sprayer 421 uses the circulating oil supplied by the oil-cooling circulation module 3 to spray the outside of the two oil-cooled motor insulation system simulation structures 6. Each submerged self-rotating spray terminal 422 uses the circulating oil supplied by the oil-cooling circulation module 3 to spray the inside of one oil-cooled motor insulation system simulation structure 6, so as to realize the oil-cooled circulation environment simulating the operation of the motor. The heat exchange module 5 is used to cool down the circulating oil output from the dual-temperature aging test platform 4 to form cooling oil, and then transports the cooling oil to the storage and temperature control module 2. The oil-cooled circulation system processing and control platform 1 is used to collect various operating data during the operation of the storage and temperature control module 2, oil-cooled circulation module 3, dual-temperature aging test platform 4, and cooling oil heat exchange module 5 during the durability performance test. The platform processes the data through preset algorithms and analysis models, and transmits the processed data to the temperature control module 2, oil-cooled circulation module 3, dual-temperature aging test platform 4, and cooling oil heat exchange module 5 via the controller. The platform controls the precise operation of various data in the temperature control module 2, oil-cooled circulation module 3, dual-temperature aging test platform 4, and cooling oil heat exchange module 5 to simulate the oil-cooled circulation environment during motor operation. This ensures a comprehensive and accurate evaluation of the durability performance of the simulated structure 6 of the oil-cooled motor insulation system.

[0054] Among them, the oil cooling circulation module 3 is an oil pump, the dual-temperature aging test platform 4 includes a dual-temperature aging chamber 41, a spray assembly 42 is installed inside the dual-temperature aging chamber 41, the dual-temperature aging chamber 41 is a dual-temperature aging tank, and the dual-temperature aging chamber 41 is equipped with a pressure sensor mounting base 411, a temperature sensor mounting base 412, a safety valve 413 and an oil outlet 414. The pressure sensor mounting base 411 is located above the dual-temperature aging tank and contains a pressure sensor. The temperature sensor mounting base 412 is located on the side of the dual-temperature aging tank. The sensor mounting base 412 is used to install a temperature sensor, and the pressure sensor 411 is used to detect the pressure inside the dual-temperature aging chamber 41 and feed the pressure signal back to the oil-cooled circulation system processing and control platform 1; the temperature sensor is used to monitor the temperature inside the dual-temperature aging chamber 41 and the temperature of the simulated structure 6 of the oil-cooled motor insulation system inside the dual-temperature aging chamber 41, and feed the temperature signal back to the oil-cooled circulation system processing and control platform 1; the safety valve 413 is used to ensure that the pressure inside the dual-temperature aging chamber 41 does not exceed the critical pressure limit; the oil outlet 414 is connected to the cooling oil heat exchange module 5.

[0055] The pressure sensor is an electronic pressure sensor that detects the gas pressure inside the dual-temperature aging tank. When the internal pressure of the dual-temperature aging tank exceeds the specified value, the safety valve 413 will automatically open, releasing some of the gas into the atmosphere, ensuring that the internal pressure of the dual-temperature aging tank does not exceed the allowable value, thus preventing accidents caused by excessive pressure. The temperature sensor mounting base 412 is used to mount a temperature sensor for real-time temperature monitoring of the simulated structure 6 of the oil-cooled motor insulation system. The temperature sensor used is a type K thermocouple, used to measure and monitor the real-time temperature of the simulated structure 6 of the cold-circuit oil-cooled motor insulation system and the cooled oil (automatic transmission fluid).

[0056] In this invention, the simulated structure 6 of the oil-cooled motor insulation system is a flat wire stator or a round wire stator insulation system model. In this embodiment, the simulated structure 6 of the oil-cooled motor insulation system is a flat wire stator insulation system model. The simulated structure 6 of the oil-cooled motor insulation system is placed in the dual-temperature aging test platform 4. An amplified current is passed through the oil-cooled circulation system processing and control platform 1 to heat the simulated structure 6 to a first preset temperature using the Joule effect. The second heating temperature of the cooling oil in the storage and temperature control module 2 is set by the oil-cooled circulation system processing and control platform 1. After the flow rate of the oil-cooled circulation module 3, the temperature and pressure in the dual-temperature aging test platform 4 are set, when all data reach the set values, the oil-cooled circulation module 3 is turned on by the oil-cooled circulation system processing and control platform 1. The oil-cooling circulation module 3 delivers circulating oil to the dual-temperature aging test platform 4, spraying it onto two simulated oil-cooled motor insulation systems 6. The ring-shaped sprayer 421 sprays the outer coils of both simulated structures 6, while each submerged self-rotating spray terminal 422 sprays the inner coil of one simulated structure 6, simulating the oil-cooling circulation environment during motor operation. This allows for durability testing of the simulated structures 6. After spraying, the circulating oil undergoes air-cooled heat exchange through the oil-heat exchange module 5, cooling down to form cooling oil. This cooling oil is then delivered to the storage and temperature control module 2, where it is heated and then transported back to the dual-temperature aging test platform 4 via the cold circulation module 3, forming a cycle. This process realistically simulates the cooling method of the oil-cooled drive motor winding insulation system, helping to deeply understand and quantify the potential impact of cooling oil composition on motor insulation performance. This provides a scientific basis for optimizing motor design and selecting appropriate cooling oil formulations.

[0057] In a specific embodiment, the dual-temperature aging tank is also equipped with a main power interface, which is used to supply power to the model coil, heating the model coil using the Joule effect to raise it to a first preset temperature. The dual-temperature aging tank and the cooling oil heat exchange module 5 are connected by a return oil pipeline, which is equipped with a return oil valve. The return oil valve is used to promptly transport the cooled oil, after spraying, from inside the dual-temperature aging tank back to the storage and temperature control module 2 via the cooling oil heat exchange module 5.

[0058] In a specific embodiment, the dual-temperature aging tank is made of seamless 304 stainless steel tubing, which can withstand pressures of over 6 atmospheres when heated to 300°C. The flange end cover has mounting flanges for the oil injection pipe and drain pipe. An external heat insulation shield is installed on the dual-temperature aging chamber to minimize heat loss from the tank.

[0059] In specific embodiments, such as Figure 3 and Figure 4As shown, the ring-shaped sprayer 421 includes a U-shaped tube 423 and two ring-shaped spray terminals 424. The inlet of the U-shaped tube 423 is connected to the oil-cooled circulation module 3. A sample holder 61 is provided on the inner wall of the U-shaped tube 423 away from the oil-cooled circulation module 3. Two oil-cooled motor insulation system simulation structures 6 are symmetrically arranged at the upper and lower ends of the sample holder 61. The two ring-shaped spray terminals 424 are symmetrically arranged on the two horizontal ends of the U-shaped tube 423 along the axial direction of the sample holder 61. The two oil-cooled motor insulation system simulation structures 6 are respectively located in the space formed by each ring-shaped spray terminal 424. A submerged self-rotating spray terminal 422 is connected to the inner wall of each ring-shaped spray terminal 424. The two submerged self-rotating spray terminals 422 are symmetrically located above and below the sample holder 61. A ring-shaped spray terminal 424 on the U-shaped tube 423 and a submersible self-rotating spray terminal 422 connected to the inner wall of the ring-shaped spray terminal 424 are located above or below the sample holder 61, forming a ring around a corresponding oil-cooled motor insulation system simulation structure 6. This sprays the outer and inner sides of the coil of the oil-cooled motor insulation system simulation structure 6, creating a comprehensive, multi-angle, and dynamic-static combined spray pipeline. This allows for more comprehensive and thorough contact between the cooling oil and the insulation system simulation structure in a sprayed state, thereby more effectively obtaining information on the influence of the cooling oil on the insulation material and insulation system of the vehicle's oil-cooled drive motor. It should be noted that a sample holder 61 is provided on the inner wall of the U-shaped tube 423 away from the oil-cooling circulation module 3. The sample holder 61 is used to hold the oil-cooled motor insulation system simulation structure 6. Two oil-cooled motor insulation system simulation structures 6 are detachably mounted above and below the sample holder 61. The detachable mounting methods include screw connection, snap-fit ​​connection, etc. In this embodiment, the detachable mounting method is screw connection.

[0060] In specific embodiments, such as Figure 4As shown, each ring-shaped spray terminal 424 includes a horizontal spray terminal 425, two inclined spray terminals 426, and two vertical spray terminals 427. The middle of the inner wall of the horizontal spray terminal 425 is connected to a ring-shaped sprayer 421. The highest inclined ends of the two inclined spray terminals 426 are connected to the two ends of the horizontal spray terminal 425 respectively. The lowest inclined end of each inclined spray terminal 426 is connected to a vertical spray terminal 427 respectively. The two inclined spray terminals 426 and the two vertical spray terminals 427 are symmetrically distributed about the ring-shaped sprayer 421 as an axis. A ring-shaped spray terminal 424 is formed by a horizontal spray terminal 425, two inclined spray terminals 426 and two vertical spray terminals 427. The spraying directions of the horizontal spray terminal 425, the two inclined spray terminals 426 and the two vertical spray terminals 427 are all towards the simulated structure 6 of the oil-cooled motor insulation system, so that the simulated structure 6 of the oil-cooled motor insulation system is sprayed in an all-round, multi-angle and dynamic-static combination.

[0061] In specific embodiments, such as Figures 5-8 As shown, the horizontal spray terminal 425 includes a connecting channel 4251 and a spray plate 4252. One end of the connecting channel 4251 is connected to a horizontal end of the U-shaped tube 423, and the other end of the connecting channel 4251 is connected to the spray plate 4252. The spraying direction of the spray plate 4252 is towards the oil-cooled motor insulation system simulation structure 6, and it is used to spray the outside of the coil of the oil-cooled motor insulation system simulation structure 6. The inlet of the U-shaped tube 423 is connected to the outlet of the oil-cooled circulation module 3, which is used to transport the circulating oil from the cooling circulation module 3 to the connecting channel 4251. The oil then enters the spray plate 4252 through the connecting channel 4251. The spray plate 4252 sprays the outside of the coil of the oil-cooled motor insulation system simulation structure 6. In this embodiment, the U-shaped tube 423 and the oil-cooled circulation module 3 are connected through an oil spraying pipeline. The oil spraying pipeline is made of stainless steel and welded and sealed to ensure that there is no leakage. Both horizontal ends of the U-shaped tube 423 are connected to the spray plate 4252. The spraying direction of all spray plates 4252 is towards the oil-cooled motor insulation system simulation structure 6.

[0062] In specific embodiments, such as Figures 5-8As shown, the spray plate 4252 has multiple annular baffles 4253 arranged from the inside out. All annular baffles 4253 are concentric and arranged at equal gradients in the radial direction. The end of each annular baffle 4253 near the inner wall of the spray plate 4252 is connected to the inner side wall of the spray plate 4252 by a connecting rod. All annular baffles 4253 are fixed by the spray plate 4252. An annular space is formed between adjacent annular baffles 4253. The innermost annular space is provided with an outlet pipe 42531. The outlet pipe 42531 connects to the submersible self-rotating spray terminal 422; an annular flow groove 4254 is provided between the lower end of all annular baffles 4253 and the bottom wall of the spray plate 4252, the annular flow groove 4254 is connected to the connecting channel 4251, and the annular flow groove 4254 is used to circulate circulating oil to all annular spaces; a cover 4256 is slidably provided on the spray plate 4252, and multiple spray holes 4255 are evenly distributed on the part of the cover 4256 located in the annular space. One end of all annular baffles 4253 near the inner wall of the spray plate 4252 is connected to the inner side wall of the spray plate 4252 by a connecting rod, and all annular baffles 4253 are fixed in the spray plate 4252 by the connecting rod. It should be noted that, as Figure 7 As shown, the height of the connecting channel 4251 is less than the height of the spray plate 4252. A sliding groove is provided at the connection end of the connecting channel 4251 and the spray plate 4252. The cover 4256 is slidably connected to the spray plate 4252 through the sliding groove. A sealing plate is provided at the contact end of the cover 4256 and the sliding groove. A stable sealing space can be formed between the sealing plate and the sliding groove.

[0063] After the oil-cooled circulation module 3 introduces circulating oil into the U-shaped pipe 423, it enters the corresponding spray plate 4252 through the connecting channel 4251. Then, it gradually enters the annular space formed by the annular flow groove 4254 and each annular baffle 4253. This allows the circulating oil to enter the spray components quickly and in large quantities, where it is divided into different spray zones by internal baffles. The innermost annular space is set with a gradient from the outermost annular space. The circulating oil first fills the innermost annular space, and then gradually fills the outermost annular space from the innermost annular space. Through all the spray zones in the annular space... The spray holes 4255 spray circulating oil toward the oil-cooled motor insulation system simulation structure 6. All spray holes 4255 are oriented toward the oil-cooled motor insulation system simulation structure 6. In this embodiment, the diameter of the spray holes 4255 is 0.3mm to 0.8mm. At least 100 of the above-mentioned spray holes 4255 are axially arranged on each annular space for spraying cooling oil onto the outside of the coil of the oil-cooled motor insulation system simulation structure 6, so as to realize all-round, multi-angle, dynamic and static spraying of the oil-cooled motor insulation system simulation structure 6.

[0064] In specific embodiments, such as Figure 9 and Figure 10 As shown, the lower sidewall of the cover 4256 is provided with a U-shaped groove 4257 and a second L-shaped plate 4258. The second L-shaped plate 4258 includes a second vertical plate and a second horizontal plate. The upper end of the second vertical plate is connected to the lower wall of the cover 4256, and the lower end is connected to one end of the second horizontal plate. The other end of the second horizontal plate is connected to one end of the U-shaped groove 4257. The symmetrical sidewalls of the spray plate 4252 are provided with a first L-shaped plate 4259. The first L-shaped plate 4259 includes a first vertical plate and a first horizontal plate. One end of the first horizontal plate is connected to the inner wall of the spray plate 4252, and the other end is connected to the upper end of the first vertical plate. The lower end of the first vertical plate is slidably disposed in the U-shaped groove 4257. The present invention allows the first vertical plate to slide within the U-shaped groove 4257, thereby sliding the cover 4256 onto the spray plate 4252. A sealing strip is provided at the sliding point to prevent leakage of circulating oil, enabling the cover 4256 to be quickly and conveniently disassembled for cleaning the spray terminal and reducing clogging during long-term use of the spray terminal.

[0065] In specific embodiments, such as Figure 10 and Figure 11 As shown, the two inner walls of the U-shaped groove 4257 are each provided with a first arc-shaped groove 42581, and the outer wall of the first vertical plate is provided with a second arc-shaped groove 42582 corresponding to the first arc-shaped groove 42581. The first arc-shaped groove 42581 and the second arc-shaped groove 42582 are axially symmetrically distributed and form a fixing hole. The fixing hole is provided with a threaded groove, and a T-shaped screw 42583 is rotatably provided on each fixing hole. When the cover 4256 is slidably placed on the outermost annular partition 4253, it is screwed into the fixing hole by the T-shaped screw 42583. The threaded groove of the fixing hole matches the thread of the T-shaped screw 42583, and the fixing holes are staggered, making the cover 4256 easy to disassemble and clean, and preventing some spray holes 4255 from becoming blocked after long-term use. At the same time, the threaded groove design on the T-shaped screw 42583 increases the path length, further reducing the probability of cooling oil leakage. The T-shaped handle at the end allows the operator to operate directly without the need for external operating tools.

[0066] In specific embodiments, such as Figures 12-13As shown, both the inclined spray terminal 426 and the vertical spray terminal 427 include a connecting channel 4251 and a spray plate 4252. The spray plate 4252 has multiple annular partitions 4253 arranged from the inside to the outside. All the annular partitions 4253 are concentric and arranged at equal gradients in the radial direction. An annular space is formed between adjacent annular partitions 4253. A square spray nozzle 428 is provided in the innermost annular space. Multiple spray holes 4255 are evenly distributed on the partial cover 4256 of the square spray nozzle 428. In this invention, the inclined spray terminal 426, the vertical spray terminal 427, and the horizontal spray terminal 425 have the same structure. The connecting channel 4251 on the inclined spray terminal 426 and the vertical spray terminal 427 are connected to the annular flow groove 4254 on the spray plate 4252. The annular flow groove 4254 is used to circulate oil to all annular spaces on the inclined spray terminal 426 and the vertical spray terminal 427. A square spray nozzle 428 is provided in the innermost annular space on the inclined spray terminal 426 and the vertical spray terminal 427. The square spray nozzle 428 is used to spray the outside of the coil on the side of the oil-cooled motor insulation system simulation structure 6. Through the structural design of the horizontal spray terminal 425, the inclined spray terminal 426, and the vertical spray terminal 427, cooling oil is sprayed on the outside of the coil of the oil-cooled motor insulation system simulation structure 6, realizing all-round, multi-angle, dynamic and static combined spraying of the oil-cooled motor insulation system simulation structure 6.

[0067] In specific embodiments, such as Figure 14 As shown, each of the submersible self-rotating spray terminals 422 includes an oil delivery pipe 4221, an oil-throwing chamber 4222, and multiple atomizing nozzles 4223. The upper end of the oil delivery pipe 4221 is connected to the innermost circumferential space, and the lower end is connected to the oil-throwing chamber 4222. Along the axial direction of the oil-throwing chamber 4222, multiple atomizing nozzles 4223 are evenly distributed on the outer wall of the oil-throwing chamber 4222. In this embodiment, the oil delivery pipe 4221 is a vertical oil delivery pipe. The upper end of the oil delivery pipe 4221 is connected to the inner wall of the ring-shaped sprayer 421, allowing the circulating oil from the ring-shaped sprayer 421 to enter the oil delivery pipe 4221. The circulating oil then enters the oil-throwing chamber 4222, and finally sprays the cooling oil out through all the atomizing nozzles 4223. Four atomizing nozzles 4223 are evenly distributed along the radial direction of the oil-throwing chamber 4222 and on the outer wall of the oil-throwing chamber 4222. The design of the atomizing nozzles 4223 can increase the spraying area of ​​the cooling oil. At the same time, when the four atomizing nozzles 4223 spray the cooling oil, according to the law of conservation of angular momentum, the oil-throwing chamber will rotate automatically without the need for an additional drive motor. This not only reduces energy consumption but also reduces the complexity and reliability of the device, thereby further reducing the spray dead angle inside the simulated structure 6 of the oil-cooled motor insulation system, i.e., the model coil. The submersible self-rotating spray terminal 422 and the ring-shaped spray terminal 421 are connected by threads, which facilitates disassembly and assembly of the experimental device.

[0068] This invention utilizes a ring-shaped sprayer 421 and all submerged, self-rotating spray terminals 422, which are lowered to the inside of the coil of the simulated oil-cooled motor insulation system 6, thereby spraying cooling oil onto the simulated structure. The combination of the two sets of spray terminals achieves comprehensive, multi-angle, three-dimensional, and dynamic-static spray cooling of the experimental object, ensuring precise and sufficient contact between the cooling oil and the simulated insulation system structure. This improves the accuracy of the durability assessment of the oil-cooled motor insulation system.

[0069] In specific embodiments, such as Figure 15 As shown, along the circumferential direction of the oil-slinging chamber 4222, multiple first flow guide baffles 7 and multiple second flow guide baffles 8 are provided inside the oil-slinging chamber 4222, with at least two second flow guide baffles 8 between adjacent first flow guide baffles 7. The first flow guide baffles 7 are arc-shaped flow guide baffles, and the second flow guide baffles 8 are vertical flow guide baffles. In this embodiment, there are four first flow guide baffles 7, which are set as arc-shaped flow guide baffles. The four first flow guide baffles 7 divide the oil-slinging chamber 4222 into four sub-chambers. The arc-shaped design reduces further flow resistance effects and facilitates the flow of cooling oil. The second flow guide baffles are arranged close to the center of the oil-slinging chamber 4222, with two second flow guide baffles 8 between adjacent first flow guide baffles 7, which are used to accelerate the flow rate of cooling oil and increase the nozzle injection pressure.

[0070] In specific embodiments, such as Figure 2 As shown, the storage and temperature control module 2 includes an oil tank 21 and a ceramic heating shell 22. The oil tank 21 is located inside the ceramic heating shell 22. The upper end of the oil tank 21 is connected to the heat exchange module 5, and the lower end is connected to the oil cooling circulation module 3. The ceramic heating shell 22 covers the oil tank 21. The oil tank 21 is connected to the heat exchange module 5 through a return pipe and to the oil cooling circulation module 3 through an oil inlet pipe. The oil tank 21 is used to store cooling oil and collect cooling oil from the cooling oil heat exchange module 5. The ceramic heating shell 22 is used to heat the cooling oil in the oil tank 21 to a preset temperature and maintain that temperature constant. The oil tank 21 has an oil level gauge inside to display the oil level in real time, and a drain port is provided at the bottom of the oil tank. When the oil tank 21 supplies circulating oil to the dual-temperature aging chamber 41, there is a negative feedback temperature judgment and control strategy. That is, the oil will only start pumping upward when the temperature reaches the preset temperature, but at the same time, the oil in the original circulation will not be interrupted.

[0071] In a specific embodiment, the oil cooling circulation module 3 is a delivery oil pump. The delivery oil pump is a high-temperature oil pump controlled by a frequency converter. The frequency converter is connected to control the inlet pump motor, so the circulation oil flow rate and velocity can be adjusted as needed.

[0072] In specific embodiments, such as Figure 1 As shown, the oil-cooled circulation system processing and control platform 1 includes a controller, a temperature control module, and a visualization display module. The visualization display module sets the temperature of the ceramic heating shell 22 in the storage and temperature control module 2, the temperature and pressure inside the dual-temperature aging chamber 41 in the dual-temperature aging test platform 4, the fan speed of the air-cooled radiator in the cooling oil heat exchange module 5, and the flow rate of the oil-cooled circulation module 3. The temperature control module heats the ceramic heating shell 22 and the simulated oil-cooled motor insulation system 6 inside the dual-temperature aging chamber 41 to reach the preset temperature. The controller and temperature control module collect various operating data and, through preset... The algorithm and analysis model, through comparative analysis and processing, control the temperature of the ceramic heating shell 22, the temperature and pressure inside the dual-temperature aging chamber 41, the winding temperature of the simulated structure 6 of the oil-cooled motor insulation system, the fan speed of the air-cooled radiator in the cooling oil heat exchange module 5, and the delivery flow rate of the oil cooling circulation module 3. The temperature control module uses a PID control unit to control the output of a toroidal transformer with a low voltage and high current for heating control. The controller is a PLC controller. The controller and the visualization display module collect and display temperature in real time through a 485 communication interface, as well as collect and display the control of major components, flow rate, pressure, etc. The oil flow rate is controlled by the oil pump controlled by the frequency converter, which adjusts the frequency to control the speed of the oil cooling circulation module 3.

[0073] In a specific embodiment, the visualization display module is also equipped with a high-temperature protection system and an emergency stop button and function. In the event of an accident, the power supply to the device and the test can be quickly stopped to protect the operator's safety. The visualization display module is equipped with a timer function, which can set the thermal aging time. Once the set time is reached, the system will automatically stop heating the oil-cooled motor insulation system simulation structure 6. At the same time, the invention also has a real-time verification function. When heating of the oil-cooled motor insulation system simulation structure 6 begins, the winding temperature and cooling oil temperature of the oil-cooled motor insulation system simulation structure 6 will gradually rise. Once the temperature of the oil-cooled motor insulation system simulation structure 6 and the cooling oil temperature reach the set temperature simultaneously, the timer immediately starts counting down until the end of the dual-temperature thermal aging test of that cycle. All detection and control parameters can be displayed on the screen of the visualization display module in real time, making them clear at a glance.

[0074] The present invention has broad applicability to the selection of the oil-cooled motor insulation system 6, and is applicable to both traditional round wire motor insulation system models and flat wire motor insulation system models.

[0075] In this invention, the outer wall of the dual-temperature aging chamber 41 and each conveying pipe are wrapped with heat-insulating cotton, thereby isolating the internal heat from dissipating to the outside as much as possible and ensuring that the temperature of the entire system is maintained within the preset temperature range.

[0076] The above-mentioned device for evaluating the impact of cooling oil on the durability of automotive oil-cooled motor insulation systems, and the method for evaluating the durability of oil-cooled motor insulation systems, such as... Figure 16 As shown, it includes the following steps:

[0077] S1. Select the experimental object, namely the simulated structure 6 of the motor insulation system, and determine the reference standard for the aging test, such as GB / T17948.1 "Functional assessment of insulation structures of rotating electrical machines - Test procedure for loose windings - Thermal assessment and classification", GB / T 17948.3 "Functional assessment of insulation structures of rotating electrical machines - Test procedure for molded windings - Thermal assessment and classification of insulation structures of rotating electrical machines", GB / T20111.1 "Temperature assessment procedure for electrical insulation systems - Part 1: General requirements - Low voltage", or relevant IEC, IEEE, and other relevant standards. Based on the selected standard and the expected heat resistance level of the test sample, select the three corresponding accelerated thermal aging temperature points (referred to as the high temperature point, medium temperature point, and low temperature point, respectively) and aging cycle times from the standard. For example, the expected heat resistance level of the simulated structure 6 of the oil-cooled motor insulation system is 180℃. According to GB / T 20111.1, the corresponding aging cycle times for the three accelerated aging temperatures are 195℃ (72 h), 215℃ (336 h), and 235℃ (840 h), respectively.

[0078] S2. Select the oil temperature according to GB / T 22578.1 "Thermal assessment of liquid and solid components of electrical insulation systems - Part 1: General requirements" or the actual requirements of the oil-cooled motor.

[0079] S3. Perform relevant pretreatment on the simulated structure 6 of the oil-cooled motor insulation system and the oil.

[0080] S4. Install the simulated structure 6 of the oil-cooled motor insulation system into the dual-temperature aging chamber 41 inside the dual-temperature aging test platform 4, arrange the thermocouples of the corresponding temperature sensors 412 at appropriate positions on the winding, and then seal the dual-temperature aging chamber 41.

[0081] S5. Load the pretreated oil into the oil storage tank 21 and seal the oil storage tank 21.

[0082] S6. Set the oil temperature, the aging temperature of the simulated structure 6 of the oil-cooled motor insulation system (e.g., first perform high-temperature double-temperature thermal aging, i.e., 235℃), and the aging time of each cycle in the visualization display module.

[0083] S7. Then, turn on the oil cooling circulation system processing and control platform 1, and use the temperature control module to raise the oil in the ceramic heating shell 22 to the preset temperature. Turn on the corresponding temperature control module in the oil cooling motor insulation system simulation structure 6 in the dual-temperature aging chamber 41 to raise it to the preset temperature.

[0084] S8. When the controller and temperature control module detect that both the oil temperature and the temperature of the simulated structure 6 of the oil-cooled motor insulation system have reached the preset temperature, the system controls the delivery flow of the oil-cooling circulation module 3. The system will automatically start the oil pump, and the oil will be pumped into the oil injection assembly pipe of the dual-temperature aging chamber 41 to spray the simulated structure 6 of the oil-cooled motor insulation system. After a period of internal temperature adjustment and control, when the temperatures of the simulated structure 6 of the oil-cooled motor insulation system and the oil reach the preset temperature again simultaneously, the system will automatically start the countdown function. The entire system will circulate according to the aforementioned oil operation loop until the set aging cycle duration is completed.

[0085] S9. Once the running time reaches the end of the set time, the system will automatically stop pumping oil and heating (including heating of the oil and heating of the simulated structure 6 of the oil-cooled motor insulation system), and sound a prompt. The LCD panel will display the words "This cycle test has been completed" to remind the test personnel that the dual-temperature aging test of this cycle has been completed.

[0086] S10. After the oil-cooled motor insulation system simulation structure 6 has cooled to approximately room temperature, close the two shut-off valves on the oil inlet and return pipes, open the dual-temperature aging chamber 41, remove the oil-cooled motor insulation system simulation structure 6, and conduct subsequent mechanical vibration, thermal shock, moisture exposure, and dielectric diagnostic tests, such as... Figure 16 As shown. Mechanical vibration operation is performed according to clause 4.1.5 "Passenger vehicles, drive motors" of ISO 16750-3:2023. The oil-cooled motor insulation system simulation structure 6 is fixed on a commercial electric vibration table or other excitation system device and subjected to vibration treatment for 2 hours in each of the X, Y, and Z directions for each aging cycle (X direction is the vehicle travel direction, Y direction is simultaneously perpendicular to the vehicle travel direction and the vertical direction, and Z direction is perpendicular to the ground direction). Then, a dedicated thermal shock test chamber or a combination of a high-temperature test chamber and a low-temperature test chamber is used to conduct thermal shock operation on the oil-cooled motor insulation system simulation structure 6 by manual movement. Generally, it starts from a low temperature such as -40℃ to a high temperature. The high temperature is the expected heat resistance level of the oil-cooled motor insulation system simulation structure 6 plus 20℃ or other temperature values ​​that meet the experimental requirements. The duration of the high and low temperature points is determined according to the heat capacity of the oil-cooled motor insulation system simulation structure 6, and can generally be selected as 1 hour, 3 hours, etc. Subsequently, the simulated structure 6 of the oil-cooled motor insulation system was moved into a constant temperature and humidity test chamber and subjected to 48 hours of moisture exposure treatment at 25℃ and 98%RH. Afterwards, the simulated structure 6 of the oil-cooled motor insulation system was subjected to withstand voltage tests, insulation resistance tests, dielectric loss factor tests, capacitance tests, and partial discharge initiation voltage tests according to the corresponding test standards. The corresponding dielectric diagnostic parameters of the simulated structure 6 in this aging sub-cycle were obtained and recorded.

[0087] S11. Then continue with steps S6 to S10 for dual-temperature thermal aging and other diagnostic tests until the simulated structure 6 of the oil-cooled motor insulation system reaches the preset end-of-life standard. The dual-temperature thermal aging test at that temperature point ends, and the dual-temperature aging test at the next temperature point, such as the medium temperature point, is carried out until the dual-temperature thermal aging test at the low temperature point is also completed.

[0088] S12. Using the data obtained from the dual-temperature aging test at all three temperature points, the data is fitted and processed according to the Arrhenius equation, and the heat resistance level of the simulated structure 6 of the oil-cooled motor insulation system is determined and evaluated according to the existing heat resistance level classification.

[0089] S13. If the air pressure inside the aging chamber 41 increases abnormally or the oil temperature of the simulated structure 6 of the oil-cooled motor insulation system becomes abnormal during the dual-temperature aging test, the device will immediately alarm and request the test personnel to judge the fault. When the air pressure or oil temperature reaches the preset safety limit, the system will automatically cut off the heating power supply and heater, regardless of whether personnel handle it, and the oil pump will also stop working to prevent catastrophic consequences.

[0090] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An apparatus for evaluating the effect of cooling oil on the durability of an oil-cooled electric machine insulation system, characterized by, The application relates to a double-temperature aging experiment platform for simulating the oil cooling circulation environment of a motor in operation. The double-temperature aging experiment platform (4) is used for simulating the oil cooling circulation environment of a motor in operation, and is used for carrying out accelerated aging test and durability test on an oil-cooled motor insulation system simulation structure (6). The double-temperature aging experiment platform (4) is provided with a spraying assembly (42) and two oil-cooled motor insulation system simulation structures (6). The spraying assembly (42) comprises a ring-enclosing sprayer (421) and two submerged self-rotating spraying terminals (422). The spraying assembly (42) is connected with the oil cooling circulation module (3). The two submerged self-rotating spraying terminals (422) are oppositely arranged in the ring-enclosing sprayer (421). One oil-cooled motor insulation system simulation structure (6) is arranged on the opposite side of each of the two submerged self-rotating spraying terminals (422). The ring-enclosing sprayer (421) sprays the two oil-cooled motor insulation system simulation structures (6) on the outside by using the circulating oil delivered by the oil cooling circulation module (3). Each of the two submerged self-rotating spraying terminals (422) sprays one of the oil-cooled motor insulation system simulation structures (6) on the inside by using the circulating oil delivered by the oil cooling circulation module (3), so as to simulate the oil cooling circulation environment of a motor in operation. The ring-enclosing sprayer (421) comprises a U-shaped pipe (423) and two ring-enclosing spraying terminals (424). The inlet of the U-shaped pipe (423) is communicated with the oil cooling circulation module (3). A sample rack (61) is arranged on the inner wall of the U-shaped pipe (423) away from the oil cooling circulation module (3). The two oil-cooled motor insulation system simulation structures (6) are symmetrically arranged at the upper end and the lower end of the sample rack (61). The two ring-enclosing spraying terminals (424) are symmetrically arranged on the two horizontal ends of the U-shaped pipe (423) along the axial direction of the sample rack (61). The two oil-cooled motor insulation system simulation structures (6) are respectively arranged in the space formed by each of the ring-enclosing spraying terminals (424). Each of the ring-enclosing spraying terminals (424) is connected with one of the submerged self-rotating spraying terminals (422). The two submerged self-rotating spraying terminals (422) are symmetrically arranged above and below the sample rack (61). Each of the ring-enclosing spraying terminals (424) comprises a horizontal spraying terminal (425), two inclined spraying terminals (426) and two vertical spraying terminals (427). The inner wall of the horizontal spraying terminal (425) is communicated with the ring-enclosing sprayer (421). The highest inclined ends of the two inclined spraying terminals (426) are respectively communicated with the two ends of the horizontal spraying terminal (425). The lowest inclined end of each of the two inclined spraying terminals (426) is respectively communicated with one of the vertical spraying terminals (427). The two inclined spraying terminals (426) and the two vertical spraying terminals (427) are symmetrically arranged around the ring-enclosing sprayer (421). ​ The horizontal spraying terminal (425) comprises a connecting channel (4251) and a spraying disc (4252), one end of the connecting channel (4251) is connected with one horizontal end of the U-shaped pipe (423), the other end of the connecting channel (4251) is communicated with the spraying disc (4252), and the spraying direction of the spraying disc (4252) is towards the oil-cooled motor insulation system simulation structure (6) for spraying the coil outer side of the oil-cooled motor insulation system simulation structure (6); The spraying disc (4252) is provided with a plurality of annular partitions (4253) arranged from inside to outside, all the annular partitions (4253) are concentric and are arranged in an equal gradient along a radial direction, one end of all the annular partitions (4253) close to the inner wall of the spraying disc (4252) is connected with the inner side wall of the spraying disc (4252) through a connecting rod, a ring space is formed between adjacent annular partitions (4253), the innermost ring space is provided with an outlet pipe (42531), the outlet pipe (42531) is communicated with the submerged self-rotating spraying terminal (422), and an annular flow channel (4254) is arranged between the lower end of all the annular partitions (4253) and the bottom wall of the spraying disc (4252), the annular flow channel (4254) is communicated with the connecting channel (4251), and the annular flow channel (4254) is used for circulating and flowing the oil to all the ring spaces; A cover (4256) is slidably arranged on the spraying disc (4252), a plurality of spraying holes (4255) are uniformly arranged on the part of the cover (4256) located in the ring space; Each submerged self-rotating spraying terminal (422) comprises an oil feeding pipe (4221), an oil throwing chamber (4222) and a plurality of atomizing nozzles (4223), the upper end of the oil feeding pipe (4221) is communicated with the outlet pipe (42531), the lower end is communicated with the oil throwing chamber (4222), and the plurality of atomizing nozzles (4223) are uniformly arranged on the outer wall of the oil throwing chamber (4222) along the radial direction of the oil throwing chamber (4222); Along the ring direction of the oil throwing chamber (4222), a plurality of first flow guide baffles (7) and a plurality of second flow guide baffles (8) are arranged in the oil throwing chamber (4222), and at least two second flow guide baffles (8) are arranged between adjacent first flow guide baffles (7); The heat exchange module (5) is used for cooling the circulating oil output by the double-temperature aging experiment platform (4) to form cooling oil and conveying the cooling oil to the storage and temperature control module (2).

2. The device for evaluating the effect of a cooling oil on the durability of an oil-cooled electric machine insulation system according to claim 1, characterized in that, The lower end side wall of the cover (4256) is provided with a U-shaped groove (4257) and a second L-shaped plate (4258), the second L-shaped plate (4258) comprises a second vertical plate and a second horizontal plate, the upper end of the second vertical plate is connected with the lower end wall of the cover (4256), one end of the second horizontal plate is connected with the lower end, and the other end of the second horizontal plate is connected with one end of the U-shaped groove (4257); the symmetrical side wall of the spray disc (4252) is provided with a first L-shaped plate (4259), the first L-shaped plate (4259) comprises a first vertical plate and a first horizontal plate, one end of the first horizontal plate is connected with the inner wall of the spray disc (4252), the other end of the first horizontal plate is connected with the upper end of the first vertical plate, and the lower end of the first vertical plate is slidably arranged in the U-shaped groove (4257).

3. The device for evaluating the effect of a cooling oil on the durability of an oil-cooled electric machine insulation system according to claim 2, characterized in that, The two inner walls of the U-shaped groove (4257) are provided with first arc-shaped grooves (42581), the outer walls of the first vertical plates are provided with second arc-shaped grooves (42582) corresponding to the first arc-shaped grooves (42581), the first arc-shaped grooves (42581) and the second arc-shaped grooves (42582) are axisymmetric and form a fixing hole, the fixing hole is provided with a threaded groove, and a T-shaped screw rod (42583) is screwed on each fixing hole.

4. The apparatus for evaluating the effect of a cooling oil on the durability of an oil-cooled electric machine insulation system according to claim 1, characterized by, The inclined spray terminal (426) and the vertical spray terminal (427) each comprise a connecting channel (4251) and a spray disc (4252), the spray disc (4252) is provided with a plurality of annular partitions (4253) arranged from inside to outside, all the annular partitions (4253) are concentric and are arranged in an equal gradient along a radial direction, annular spaces are formed between adjacent annular partitions (4253), the innermost annular space is provided with a square spray port (428), and a plurality of spray holes (4255) are uniformly arranged on the cover (4256) located at the square spray port (428).

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