Rotor temperature rise prediction method and device for driving motor, electronic equipment and storage medium

Abstract

The application provides a rotor temperature rise prediction method and device of a driving motor, electronic equipment and a storage medium, wherein the rotor temperature rise prediction method of the driving motor comprises: obtaining a first rotor temperature rise result of the driving motor, wherein the first rotor temperature rise result is obtained based on a motor temperature rise bench test, and the motor temperature rise bench test is used to test rotor temperature rise of a rotor test point of the driving motor under test conditions and test working conditions; a one-dimensional simulation model is calibrated based on a three-dimensional structure of the driving motor; a rotor temperature rise MAP table of the driving motor is determined based on the one-dimensional simulation model; and a rotor temperature rise prediction result of the driving motor under real vehicle working conditions is determined based on the rotor temperature rise MAP table of the driving motor. The application can predict the motor rotor temperature rise of the vehicle, and solve the technical problem that the rotor temperature rise of the driving motor is difficult to collect when the actual vehicle is used. Meanwhile, the application has the advantages of low cost and precision meeting the actual use requirements.

Description

Technical Field

[0001] This application relates to the field of drive motors, and more specifically, to a method, apparatus, electronic device, and storage medium for predicting rotor temperature rise of a drive motor. Background Technology

[0002] The drive motor, as the "heart" of a new energy vehicle, is a key component affecting the vehicle's power, economy, comfort, and safety. Drive motors are generally permanent magnet synchronous motors, and their structure includes a stator, rotor, windings, and temperature control components. Drive motors need to operate at suitable temperatures to achieve their optimal performance; excessively high temperatures not only affect motor performance but may also lead to safety issues. In actual vehicles, motor temperature is typically obtained through temperature sensors, but these sensors are usually only positioned on the stator or windings, thus only measuring the temperature of the stator or windings. Obtaining the rotor temperature in an actual vehicle is difficult, and excessively high rotor temperatures can cause demagnetization of the permanent magnets, affecting motor torque output and potentially leading to power loss and safety concerns. Therefore, predicting the rotor temperature in an actual vehicle is extremely important.

[0003] Currently, in actual vehicles, the temperature of the motor is generally obtained by real-time acquisition of the temperature rise of the motor stator or windings through temperature sensors. However, due to the high speed of the motor rotor, it is difficult to place sensors, making it impossible to obtain the actual temperature rise of the motor rotor. Summary of the Invention

[0004] The purpose of this application is to provide a method, device, electronic device, and storage medium for predicting the rotor temperature rise of a drive motor, thereby solving the technical problem of difficulty in collecting rotor temperature rise data during actual vehicle use. Furthermore, this application has the advantages of low cost and accuracy sufficient for practical applications.

[0005] In a first aspect, the present invention provides a method for predicting the rotor temperature rise of a drive motor, the method comprising:

[0006] Obtain the first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on the motor temperature rise bench test, and the motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the rotor test point under test conditions and test operating conditions;

[0007] A one-dimensional simulation model is constructed based on the three-dimensional structure of the drive motor, and the one-dimensional simulation model is calibrated based on the first rotor temperature rise result of the drive motor.

[0008] Based on the aforementioned one-dimensional simulation model, a rotor temperature rise MAP table for the drive motor is determined, wherein the rotor temperature rise MAP table for the drive motor characterizes the temperature of the rotor of the drive motor under multiple simulation and simulation cooling conditions.

[0009] Based on the rotor temperature rise MAP table of the drive motor, the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions is determined.

[0010] The first aspect of this application enables the acquisition of a first rotor temperature rise result of a drive motor, wherein the first rotor temperature rise result is obtained based on a motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at test points under test conditions and test operating conditions. Furthermore, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor, and the one-dimensional simulation model can be calibrated based on the first rotor temperature rise result of the drive motor. Based on the one-dimensional simulation model, a rotor temperature rise MAP table of the drive motor can be determined, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the predicted rotor temperature rise result of the drive motor under actual vehicle operating conditions can be determined.

[0011] Compared with existing technologies, this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem of difficulty in collecting the drive motor rotor temperature rise during actual vehicle use. In addition, it does not require placing a temperature sensor on the rotor during the prediction process, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0012] In an optional implementation, the construction of a one-dimensional simulation model based on the three-dimensional structure of the drive motor includes:

[0013] A heat conduction and heat transfer model of the drive motor is constructed, wherein the drive motor is equivalent to 72 nodes, and the 72 nodes of the drive motor are interconnected based on the structure of the drive motor to form the heat conduction and heat transfer model.

[0014] The heat conduction and heat transfer model is used as the one-dimensional simulation model.

[0015] This optional implementation can construct a heat conduction and heat transfer model of the drive motor, wherein the drive motor is equivalent to 72 nodes, and the 72 nodes of the drive motor are interconnected based on the structure of the drive motor to form the heat conduction and heat transfer model, which can then be used as the one-dimensional simulation model. Since the heat conduction and heat transfer model is based on the 72 equivalent nodes of the drive motor and the structure of the drive motor, it can accurately reflect the thermal conductivity characteristics of the drive motor.

[0016] In an optional implementation, calibrating the one-dimensional simulation model based on the first rotor temperature rise result of the drive motor includes:

[0017] The test conditions are used as the simulation input conditions for the one-dimensional simulation model, so that the one-dimensional simulation model outputs the rotor temperature rise simulation results.

[0018] The rotor temperature rise simulation results are compared with the first rotor temperature rise results, and the one-dimensional simulation model is calibrated based on the difference between the first rotor temperature rise results and the rotor temperature rise simulation results.

[0019] This optional implementation can use the test conditions as the simulation input conditions for the one-dimensional simulation model, so that the one-dimensional simulation model outputs the rotor temperature rise simulation results. Then, the rotor temperature rise simulation results can be compared with the first rotor temperature rise results, and the one-dimensional simulation model can be calibrated based on the difference between the first rotor temperature rise results and the rotor temperature rise simulation results, so that the calibrated one-dimensional simulation model can more accurately reflect the heat conduction and heat transfer characteristics of the drive motor.

[0020] In an optional implementation, the test conditions include a first condition, a second condition, and a third condition, wherein:

[0021] The first operating condition is: the speed of the drive motor is 40 km / h, and it travels along a road with a slope of 10%.

[0022] The second operating condition is: the speed of the drive motor is 120 km / h, and it travels along a road with a slope of 3%.

[0023] The third operating condition is: the speed of the drive motor is 140km / h, and it travels along a road with a 0% gradient;

[0024] Furthermore, the test conditions include the test environment temperature and the test cooling conditions, wherein the test cooling conditions are an inlet water temperature of 60°C and an inlet water flow rate of 10L / min, and the test environment temperature is 65°C.

[0025] This optional implementation method can perform simulation tests on the one-dimensional simulation model under the first, second, and third operating conditions, as well as the test environment temperature and test cooling conditions.

[0026] In an optional implementation, determining the rotor temperature rise MAP of the drive motor based on the one-dimensional simulation model includes:

[0027] Determine the rotational speed and torque of the drive motor rotor under each of the simulated operating conditions;

[0028] Based on the rotor speed and torque of the drive motor under each simulation condition, the copper loss and iron loss under each simulation condition are determined.

[0029] The copper and iron losses under each simulation condition are substituted into the one-dimensional simulation model so that the one-dimensional simulation model outputs the rotor temperature rise MAP table of the drive motor based on the simulation cooling conditions.

[0030] This optional implementation can determine the rotational speed and torque of the drive motor rotor under each simulation condition, and then, based on the rotational speed and torque of the drive motor rotor under each simulation condition, determine the copper loss and iron loss under each simulation condition. Furthermore, the copper loss and iron loss under each simulation condition can be substituted into the one-dimensional simulation model, so that the one-dimensional simulation model outputs a rotor temperature rise MAP table for the drive motor based on the simulated cooling conditions.

[0031] In an optional implementation, the simulated cooling conditions include simulated water temperature and simulated inlet water flow rate, wherein the simulated water temperature is within the range of 40-80 degrees Celsius, and the simulated inlet water flow rate includes 2, 4, 8, 10, 12, and 14 L / min.

[0032] In an optional implementation, determining the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions based on the rotor temperature rise MAP table of the drive motor includes:

[0033] Obtain the actual vehicle cooling conditions, wherein the actual vehicle cooling conditions include the actual vehicle water inlet temperature and the actual vehicle water inlet flow rate;

[0034] Based on the actual vehicle water inlet temperature and the actual vehicle water inlet flow, the target MAP table is determined from the rotor temperature rise MAP table of the drive motor;

[0035] Based on the actual vehicle speed, actual vehicle torque, and the target MAP table, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions is determined.

[0036] This optional implementation can obtain actual vehicle cooling conditions, including actual vehicle inlet water temperature and actual vehicle inlet water flow rate. Based on the actual vehicle inlet water temperature and actual vehicle inlet water flow rate, a target MAP can be determined from the rotor temperature rise MAP of the drive motor. Furthermore, based on the actual vehicle speed, actual vehicle torque, and the target MAP, a predicted rotor temperature rise result for the drive motor under actual vehicle operating conditions can be determined.

[0037] In a second aspect, the present invention provides a rotor temperature rise prediction device for a drive motor, the device comprising:

[0038] The acquisition module is used to acquire the first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on the motor temperature rise bench test, and the motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the rotor test point under test conditions and test conditions.

[0039] A construction module is used to construct a one-dimensional simulation model based on the three-dimensional structure of the drive motor, and to calibrate the one-dimensional simulation model based on the first rotor temperature rise result of the drive motor.

[0040] The first determining module is used to determine the rotor temperature rise MAP table of the drive motor based on the one-dimensional simulation model, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the rotor of the drive motor under multiple simulation and simulation cooling conditions.

[0041] The second determining module is used to determine the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions based on the rotor temperature rise MAP table of the drive motor.

[0042] The apparatus of the second aspect of this application, by executing a rotor temperature rise prediction method for a drive motor, can obtain a first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on a motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at test points under test conditions and test operating conditions. Then, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor, and the one-dimensional simulation model is calibrated based on the first rotor temperature rise result of the drive motor. Furthermore, a rotor temperature rise MAP table of the drive motor can be determined based on the one-dimensional simulation model, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions can be determined.

[0043] Compared with existing technologies, this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem of difficulty in collecting the drive motor rotor temperature rise during actual vehicle use. In addition, it does not require placing a temperature sensor on the rotor during the prediction process, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0044] Thirdly, the present invention provides an electronic device, comprising:

[0045] Processor; and

[0046] The memory is configured to store machine-readable instructions that, when executed by the processor, perform the rotor temperature rise prediction method for the drive motor as described in any of the foregoing embodiments.

[0047] The electronic device of the third aspect of this application, by executing a rotor temperature rise prediction method for a drive motor, can obtain a first rotor temperature rise result of the drive motor. This first rotor temperature rise result is obtained based on a motor temperature rise bench test, which is used to test the rotor temperature rise at test points of the drive motor under test conditions and operating conditions. Furthermore, it can construct a one-dimensional simulation model based on the three-dimensional structure of the drive motor, and calibrate the one-dimensional simulation model based on the first rotor temperature rise result. Then, it can determine a rotor temperature rise MAP table for the drive motor based on the one-dimensional simulation model. The rotor temperature rise MAP table characterizes the temperature of the drive motor's rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table, it can determine the predicted rotor temperature rise result of the drive motor under actual vehicle operating conditions.

[0048] Compared with existing technologies, this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem of difficulty in collecting the drive motor rotor temperature rise during actual vehicle use. In addition, it does not require placing a temperature sensor on the rotor during the prediction process, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0049] Fourthly, the present invention provides a storage medium storing a computer program, the computer program being executed by a processor as described in any of the foregoing embodiments, the rotor temperature rise prediction method for a drive motor.

[0050] The storage medium of the fourth aspect of this application, by executing a rotor temperature rise prediction method for a drive motor, can obtain a first rotor temperature rise result of the drive motor. This first rotor temperature rise result is obtained based on a motor temperature rise bench test, which is used to test the rotor temperature rise at test points of the drive motor under test conditions and operating conditions. Furthermore, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor. Based on the first rotor temperature rise result of the drive motor, the one-dimensional simulation model is calibrated. Based on the one-dimensional simulation model, a rotor temperature rise MAP table of the drive motor can be determined. The rotor temperature rise MAP table of the drive motor characterizes the temperature of the drive motor's rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions can be determined.

[0051] Compared with existing technologies, this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem of difficulty in collecting the drive motor rotor temperature rise during actual vehicle use. In addition, it does not require placing a temperature sensor on the rotor during the prediction process, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic flowchart of a rotor temperature rise prediction method for a drive motor disclosed in an embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the structure of a rotor disclosed in an embodiment of this application;

[0055] Figure 3 This is a schematic diagram of a one-dimensional simulation model of motor rotor temperature rise disclosed in an embodiment of this application;

[0056] Figure 4 This is a schematic diagram of the external torque characteristic curve of a motor disclosed in an embodiment of this application;

[0057] Figure 5This is a rotor temperature rise MAP diagram with a simulated inlet water temperature of 60℃ and a simulated inlet water flow rate of 10L / min disclosed in the embodiments of this application;

[0058] Figure 6 This is a MAP diagram of rotor temperature rise under a simulated inlet water temperature of 60℃ and an inlet water flow rate of 6L / min.

[0059] Figure 7 This is a MAP diagram showing the rotor temperature rise at a simulated inlet water temperature of 50℃ and a simulated inlet water flow rate of 10L / min.

[0060] Figure 8 This is a schematic diagram of a rotor temperature rise prediction result disclosed in an embodiment of this application;

[0061] Figure 9 This is a schematic diagram of the structure of a rotor temperature rise prediction device for a drive motor disclosed in an embodiment of this application;

[0062] Figure 10 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. Detailed Implementation

[0063] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0064] Example 1

[0065] Please see Figure 1 , Figure 1 This is a flowchart illustrating a rotor temperature rise prediction method for a drive motor disclosed in an embodiment of this application, as shown below. Figure 1 As shown, the method in this application embodiment includes the following steps:

[0066] 101. Obtain the first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on the motor temperature rise bench test, which is used to test the rotor temperature rise of the drive motor at the test point under test conditions and test conditions.

[0067] 102. Construct a one-dimensional simulation model based on the three-dimensional structure of the drive motor, and calibrate the one-dimensional simulation model based on the temperature rise result of the first rotor of the drive motor.

[0068] 103. Based on the aforementioned one-dimensional simulation model, determine the rotor temperature rise MAP table of the drive motor, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions.

[0069] 104. Based on the rotor temperature rise MAP table of the drive motor, determine the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions.

[0070] This application embodiment can obtain the first rotor temperature rise result of the drive motor. The first rotor temperature rise result is obtained based on the motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the test point under test conditions and test operating conditions. Then, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor. Based on the first rotor temperature rise result of the drive motor, the one-dimensional simulation model is calibrated. Then, based on the one-dimensional simulation model, the rotor temperature rise MAP table of the drive motor can be determined. The rotor temperature rise MAP table of the drive motor represents the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions can be determined.

[0071] Compared with existing technologies, the embodiments of this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem that it is difficult to collect the temperature rise of the drive motor rotor during actual vehicle use. In addition, during the prediction process, it is not necessary to place a temperature sensor on the rotor, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0072] In this application embodiment, for the motor temperature rise test bench test, please refer to [link / reference]. Figure 2 , Figure 2 This is a schematic diagram of the structure of a rotor disclosed in an embodiment of this application. Figure 2 As shown, you can choose as follows Figure 2 Test points 1 and 2 are shown as rotor test points. Further, for the test results of test points 1 and 2, please refer to Table 1, which is a rotor temperature rise test result table disclosed in an embodiment of this application. As shown in Table 1, under the test conditions (experimental conditions) of: inlet water temperature 60 degrees Celsius, inlet water flow rate 10 L / min, and test operating condition 40 kph@10%, the temperature at test point 1 is 100 degrees Celsius, while the temperature at test point 2 is 99 degrees Celsius.

[0073]

[0074]

[0075] Table 1

[0076] In one optional implementation of this application, the step of constructing a one-dimensional simulation model based on the three-dimensional structure of the drive motor includes the following sub-steps:

[0077] A heat conduction and heat transfer model of the drive motor is constructed, wherein the drive motor is equivalent to 72 nodes, and the 72 nodes of the drive motor are interconnected based on the structure of the drive motor to form a heat conduction and heat transfer model.

[0078] The heat conduction and heat transfer model is used as a one-dimensional simulation model.

[0079] This optional implementation can construct a heat conduction and heat transfer model of the drive motor, wherein the drive motor is equivalent to 72 nodes, and the 72 nodes of the drive motor are interconnected based on the structure of the drive motor to form a heat conduction and heat transfer model, which can then be used as a one-dimensional simulation model. Since the heat conduction and heat transfer model is based on the 72 equivalent nodes of the drive motor and the structure of the drive motor, it can accurately reflect the thermal conductivity characteristics of the drive motor.

[0080] In the above optional implementations, for example, a one-dimensional simulation model is as follows: Figure 3 As shown, where, Figure 3 This is a schematic diagram of a one-dimensional simulation model of motor rotor temperature rise disclosed in an embodiment of this application. Specifically, as shown... Figure 3 As shown, the motor is split along the axial direction, and a thermal simulation analysis model of the motor is established according to 1 / 2. The motor is equivalent to 72 nodes, and their heat conduction and heat transfer models are established according to the actual structure. The actual structure of the motor rotor consists of 6 rotor discs, so the motor rotor is divided into 6 nodes along the axial direction and into inner and outer layers along the radial direction. The rotor is equivalent to 12 nodes in total, and the equivalent direction of the winding is the same as that of the rotor.

[0081] In one optional implementation of this application, the step of calibrating a one-dimensional simulation model based on the first rotor temperature rise result of the drive motor includes the following sub-steps:

[0082] The test conditions are used as the simulation input conditions for the one-dimensional simulation model so that the one-dimensional simulation model can output the rotor temperature rise simulation results.

[0083] The rotor temperature rise simulation results are compared with the first rotor temperature rise results, and the one-dimensional simulation model is calibrated based on the difference between the first rotor temperature rise results and the rotor temperature rise simulation results.

[0084] This optional implementation can use the test conditions as the simulation input conditions for the one-dimensional simulation model, so that the one-dimensional simulation model outputs the rotor temperature rise simulation results. Then, the rotor temperature rise simulation results can be compared with the first rotor temperature rise results, and the one-dimensional simulation model can be calibrated based on the difference between the first rotor temperature rise results and the rotor temperature rise simulation results. Finally, the calibrated one-dimensional simulation model can more accurately reflect the heat conduction and heat transfer characteristics of the drive motor.

[0085] For the above-mentioned optional implementation methods, please refer to Table 2, which is a schematic diagram of simulation results disclosed in an embodiment of this application. As shown in Table 2, when the test condition 40kph@10% is used as the simulation input, the simulation results are: the temperature at test point 1 is 101 degrees Celsius, and the temperature at test point 2 is 100 degrees Celsius. This is not significantly different from the results obtained from the motor temperature rise bench test: the temperature at test point 1 is 100 degrees Celsius, and the temperature at test point 2 is 99 degrees Celsius. This indicates that the one-dimensional simulation model has not been distorted or the degree of distortion is within a controllable range. Furthermore, the one-dimensional simulation model can be calibrated based on the difference between the first rotor temperature rise result and the rotor temperature rise simulation result. For example, based on the difference between the first rotor temperature rise result (i.e., the result obtained from the motor temperature rise bench test) and the rotor temperature rise simulation result, the accuracy error of the one-dimensional simulation model can be calibrated to be between 0 and 1 degree Celsius.

[0086] In this embodiment of the application, as an optional implementation, the test conditions include a first condition, a second condition, and a third condition, wherein:

[0087] The first operating condition is: the drive motor speed is 40km / h, and it travels along a road with a slope of 10%.

[0088] The second operating condition is: the drive motor speed is 120km / h, and it travels along a road with a 3% gradient;

[0089] The third operating condition is: the drive motor speed is 140km / h, and it travels along a road with a 0% gradient;

[0090] In addition, the test conditions include the test ambient temperature and test cooling conditions. The test cooling conditions are: water inlet temperature of 60℃, water inlet flow rate of 10L / min, and test ambient temperature of 65℃.

[0091] This optional implementation method can perform simulation tests on the one-dimensional simulation model under the first, second, and third operating conditions, as well as the test environment temperature and test cooling conditions.

[0092] In an optional implementation, the step of determining the rotor temperature rise MAP of the drive motor based on the one-dimensional simulation model includes the following sub-steps:

[0093] Determine the rotor speed and torque of the drive motor under each simulation condition;

[0094] Based on the rotor speed and torque of the drive motor under each simulation condition, the copper loss and iron loss under each simulation condition are determined.

[0095] The copper and iron losses under each simulation condition are substituted into the one-dimensional simulation model so that the one-dimensional simulation model can output the rotor temperature rise MAP table of the drive motor based on the simulated cooling conditions.

[0096] This optional implementation can determine the rotational speed and torque of the drive motor rotor under each simulation condition, and then determine the copper loss and iron loss under each simulation condition based on the rotational speed and torque of the drive motor rotor under each simulation condition. The copper loss and iron loss under each simulation condition can then be substituted into the one-dimensional simulation model so that the one-dimensional simulation model outputs a rotor temperature rise MAP table of the drive motor based on the simulated cooling conditions.

[0097] In the above optional implementations, for the rotor speed and torque of the drive motor under each simulation condition, please refer to [link / reference needed]. Figure 4 , Figure 4 This is a schematic diagram of the external characteristic curve of motor torque disclosed in an embodiment of this application.

[0098] Furthermore, to predict the rotor temperature under all operating conditions, it is necessary to obtain the rotor temperature rise values ​​under all operating conditions. This invention obtains the rotor temperature under different torques and speeds through simulation calculations. During simulation, the speed and torque are first determined, and then the corresponding copper and iron losses are obtained through simulation calculations. The rotor temperature rise values ​​can then be obtained from the calibrated simulation model with the copper and iron losses, and plotted into a MAP table. The plotted MAP table is shown below. Figure 5 , Figure 6 , Figure 7 As shown, where, Figure 5 This is a rotor temperature rise MAP diagram with a simulated inlet water temperature of 60℃ and a simulated inlet water flow rate of 10L / min, as disclosed in the embodiments of this application. Figure 6 This is a MAP (Modular Temperature Rise) diagram of the rotor with a simulated inlet water temperature of 60℃ and an inlet water flow rate of 6L / min. Figure 7 This is a MAP diagram showing the rotor temperature rise at a simulated inlet water temperature of 50℃ and a simulated inlet water flow rate of 10L / min.

[0099] In the above optional embodiments, the simulated cooling conditions include simulated water temperature and simulated inlet water flow rate, wherein the simulated water temperature is within the range of 40-80 degrees Celsius, and the simulated inlet water flow rate includes 2, 4, 8, 10, 12, and 14 L / min.

[0100] In an optional implementation, the step of determining the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions based on the rotor temperature rise MAP table of the drive motor includes the following sub-steps:

[0101] Obtain the actual vehicle cooling conditions, including the actual vehicle inlet water temperature and the actual vehicle inlet water flow rate;

[0102] Based on the actual vehicle water inlet temperature and actual vehicle water inlet flow, the target MAP table is determined from the rotor temperature rise MAP table of the drive motor.

[0103] Based on the actual vehicle speed, actual vehicle torque, and target MAP table, the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions is determined.

[0104] This optional implementation can obtain actual vehicle cooling conditions, including actual vehicle inlet water temperature and actual vehicle inlet water flow rate. Based on the actual vehicle inlet water temperature and flow rate, a target MAP can be determined from the rotor temperature rise MAP of the drive motor. Furthermore, based on the actual vehicle speed, actual vehicle torque, and the target MAP, the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions can be determined. As an example, the predicted rotor temperature rise under actual vehicle operating conditions is as follows: Figure 8 As shown, where, Figure 8 This is a schematic diagram of a rotor temperature rise prediction result disclosed in an embodiment of this application.

[0105] Example 2

[0106] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a rotor temperature rise prediction device for a drive motor disclosed in an embodiment of this application, as shown below. Figure 9 As shown, the apparatus in this embodiment includes the following functional modules:

[0107] The acquisition module 201 is used to acquire the first rotor temperature rise result of the drive motor. The first rotor temperature rise result is obtained based on the motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the test point under test conditions and test conditions.

[0108] Module 202 is used to construct a one-dimensional simulation model based on the three-dimensional structure of the drive motor, and to calibrate the one-dimensional simulation model based on the first rotor temperature rise result of the drive motor.

[0109] The first determining module 203 is used to determine the rotor temperature rise MAP table of the drive motor based on the one-dimensional simulation model, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the rotor of the drive motor under multiple simulation and simulation cooling conditions.

[0110] The second determining module 204 is used to determine the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions based on the rotor temperature rise MAP table of the drive motor.

[0111] The apparatus in this application embodiment, by executing a rotor temperature rise prediction method for a drive motor, can obtain a first rotor temperature rise result for the drive motor. This first rotor temperature rise result is obtained based on a motor temperature rise bench test, which is used to test the rotor temperature rise at test points of the drive motor under test conditions and operating conditions. Furthermore, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor. Based on the first rotor temperature rise result, the one-dimensional simulation model is calibrated. Then, based on the one-dimensional simulation model, a rotor temperature rise MAP table for the drive motor can be determined. This MAP table characterizes the temperature of the drive motor's rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table, the predicted rotor temperature rise result of the drive motor under actual vehicle operating conditions can be determined.

[0112] Compared with existing technologies, the embodiments of this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem that it is difficult to collect the temperature rise of the drive motor rotor during actual vehicle use. In addition, during the prediction process, it is not necessary to place a temperature sensor on the rotor, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0113] Example 3

[0114] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application, such as... Figure 10 As shown, the electronic device in this application embodiment includes:

[0115] Processor 301; and

[0116] The memory 302 is configured to store machine-readable instructions that, when executed by the processor 301, perform a rotor temperature rise prediction method for a drive motor as described in any of the foregoing embodiments.

[0117] The electronic device in this application embodiment can obtain the first rotor temperature rise result of the drive motor by executing the rotor temperature rise prediction method of the drive motor. The first rotor temperature rise result is obtained based on the motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the test point under test conditions and test operating conditions. Then, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor. Based on the first rotor temperature rise result of the drive motor, the one-dimensional simulation model is calibrated. Based on the one-dimensional simulation model, the rotor temperature rise MAP table of the drive motor can be determined. The rotor temperature rise MAP table of the drive motor represents the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions can be determined.

[0118] Compared with existing technologies, the embodiments of this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem that it is difficult to collect the temperature rise of the drive motor rotor during actual vehicle use. In addition, during the prediction process, it is not necessary to place a temperature sensor on the rotor, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0119] Example 4

[0120] This application provides a storage medium storing a computer program, which is executed by a processor as a rotor temperature rise prediction method for a drive motor as described in any of the foregoing embodiments.

[0121] The storage medium in this application embodiment can obtain the first rotor temperature rise result of the drive motor by executing the rotor temperature rise prediction method of the drive motor. The first rotor temperature rise result is obtained based on the motor temperature rise bench test. The motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the test point under test conditions and test operating conditions. Then, a one-dimensional simulation model can be constructed based on the three-dimensional structure of the drive motor. Based on the first rotor temperature rise result of the drive motor, the one-dimensional simulation model is calibrated. Based on the one-dimensional simulation model, the rotor temperature rise MAP table of the drive motor can be determined. The rotor temperature rise MAP table of the drive motor represents the temperature of the drive motor rotor under multiple simulation and simulation cooling conditions. Finally, based on the rotor temperature rise MAP table of the drive motor, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions can be determined.

[0122] Compared with existing technologies, the embodiments of this application can calculate the rotor temperature rise MAP table under different cooling conditions and operating conditions based on the simulation model, and then predict the motor rotor temperature rise based on the rotor temperature rise MAP table, thereby solving the technical problem that it is difficult to collect the temperature rise of the drive motor rotor during actual vehicle use. In addition, during the prediction process, it is not necessary to place a temperature sensor on the rotor, thus eliminating the need for a temperature sensor and reducing costs. On the other hand, the simulation results output by the model can meet the accuracy requirements.

[0123] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0124] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0125] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0126] It should be noted that if a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0127] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0128] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for predicting rotor temperature rise of a drive motor, characterized in that, The method includes: Obtain the first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on the motor temperature rise bench test, and the motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the rotor test point under test conditions and test operating conditions; A one-dimensional simulation model is constructed based on the three-dimensional structure of the drive motor, and the one-dimensional simulation model is calibrated based on the first rotor temperature rise result of the drive motor. Based on the one-dimensional simulation model, the rotor temperature rise MAP table of the drive motor is determined, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the rotor of the drive motor under multiple simulation and simulation cooling conditions. Based on the rotor temperature rise MAP table of the drive motor, the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions is determined. The determination of the rotor temperature rise MAP table of the drive motor based on the one-dimensional simulation model includes: Determine the rotational speed and torque of the drive motor rotor under each simulation condition; Based on the rotor speed and torque of the drive motor under each simulation condition, the copper loss and iron loss under each simulation condition are determined. Substitute the copper and iron losses under each of the simulation conditions into the one-dimensional simulation model so that the one-dimensional simulation model outputs the rotor temperature rise MAP table of the drive motor based on the simulation cooling conditions. The rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions is determined based on the rotor temperature rise MAP table of the drive motor, including: Obtain the actual vehicle cooling conditions, wherein the actual vehicle cooling conditions include the actual vehicle water inlet temperature and the actual vehicle water inlet flow rate; Based on the actual vehicle water inlet temperature and the actual vehicle water inlet flow rate, the target MAP table is determined from the rotor temperature rise MAP table of the drive motor; Based on the actual vehicle speed, actual vehicle torque, and the target MAP table, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions is determined.

2. The method as described in claim 1, characterized in that, The construction of a one-dimensional simulation model based on the three-dimensional structure of the drive motor includes: A heat conduction and heat transfer model of the drive motor is constructed, wherein the drive motor is equivalent to 72 nodes, and the 72 nodes of the drive motor are interconnected based on the structure of the drive motor to form the heat conduction and heat transfer model. The heat conduction and heat transfer model is used as the one-dimensional simulation model.

3. The method as described in claim 2, characterized in that, The calibration of the one-dimensional simulation model based on the first rotor temperature rise result of the drive motor includes: The test conditions are used as the simulation input conditions for the one-dimensional simulation model, so that the one-dimensional simulation model outputs the rotor temperature rise simulation results. The rotor temperature rise simulation results are compared with the first rotor temperature rise results, and the one-dimensional simulation model is calibrated based on the difference between the first rotor temperature rise results and the rotor temperature rise simulation results.

4. The method as described in claim 3, characterized in that, The test conditions include a first condition, a second condition, and a third condition, wherein: The first operating condition is: the speed of the drive motor is 40 km / h, and it travels along a road with a slope of 10%. The second operating condition is: the speed of the drive motor is 120km / h, and it travels along a road with a slope of 3%. The third operating condition is: the speed of the drive motor is 140km / h, and it travels along a road with a 0% gradient; Furthermore, the test conditions include the test environment temperature and the test cooling conditions, wherein the test cooling conditions are an inlet water temperature of 60°C and an inlet water flow rate of 10L / min, and the test environment temperature is 65°C.

5. The method as described in claim 4, characterized in that, The simulated cooling conditions include simulated water temperature and simulated inlet water flow rate. The simulated water temperature is between 40 and 80 degrees Celsius, and the simulated inlet water flow rate includes 2, 4, 8, 10, 12, and 14 L / min.

6. A rotor temperature rise prediction device for a drive motor, characterized in that, The device includes: The acquisition module is used to acquire the first rotor temperature rise result of the drive motor, wherein the first rotor temperature rise result is obtained based on the motor temperature rise bench test, and the motor temperature rise bench test is used to test the rotor temperature rise of the drive motor at the rotor test point under test conditions and test conditions. A construction module is used to construct a one-dimensional simulation model based on the three-dimensional structure of the drive motor, and to calibrate the one-dimensional simulation model based on the first rotor temperature rise result of the drive motor. The first determining module is used to determine the rotor temperature rise MAP table of the drive motor based on the one-dimensional simulation model, wherein the rotor temperature rise MAP table of the drive motor characterizes the temperature of the rotor of the drive motor under multiple simulation and simulation cooling conditions. The second determining module is used to determine the predicted rotor temperature rise of the drive motor under actual vehicle operating conditions based on the rotor temperature rise MAP table of the drive motor. And, the determination of the rotor temperature rise MAP table of the drive motor based on the one-dimensional simulation model includes: Determine the rotational speed and torque of the drive motor rotor under each simulation condition; Based on the rotor speed and torque of the drive motor under each simulation condition, the copper loss and iron loss under each simulation condition are determined. Substitute the copper and iron losses under each of the simulation conditions into the one-dimensional simulation model so that the one-dimensional simulation model outputs the rotor temperature rise MAP table of the drive motor based on the simulation cooling conditions. The rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions is determined based on the rotor temperature rise MAP table of the drive motor, including: Obtain the actual vehicle cooling conditions, wherein the actual vehicle cooling conditions include the actual vehicle water inlet temperature and the actual vehicle water inlet flow rate; Based on the actual vehicle water inlet temperature and the actual vehicle water inlet flow rate, the target MAP table is determined from the rotor temperature rise MAP table of the drive motor; Based on the actual vehicle speed, actual vehicle torque, and the target MAP table, the rotor temperature rise prediction result of the drive motor under actual vehicle operating conditions is determined.

7. An electronic device, characterized in that, include: processor; as well as A memory configured to store machine-readable instructions that, when executed by the processor, perform the rotor temperature rise prediction method for a drive motor as described in any one of claims 1-4.

8. A storage medium, characterized in that, The storage medium stores a computer program, which is executed by a processor as described in any one of claims 1-4, for predicting the rotor temperature rise of a drive motor.

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