Motor stator temperature field test and analysis method, device and system

Abstract

The present application relates to the technical field of motor testing, and particularly relates to a motor stator temperature field testing and analyzing method, device and system, which comprises the following steps: obtaining a plurality of first temperature values and second temperature values under a preset test condition, the first temperature values being collected by a first thermocouple sensor, and the second temperature values being collected by a second thermocouple sensor, the first thermocouple sensor being arranged inside a coil of a stator core of a motor, and the second thermocouple sensor being arranged in a groove of the stator core, the groove being distributed on the periphery of the stator core; obtaining fitting data of a stator temperature field based on the first temperature values and the second temperature values; and performing abnormal temperature point identification and future temperature field change prediction based on the fitting data; the method realizes actual measurement of the internal temperature and the peripheral temperature of the stator, and the fitting data of the temperature field obtained by the method has higher accuracy compared with temperature field data simulation, which helps to improve the accuracy of subsequent data analysis.

Description

Technical Field

[0001] This invention relates to the field of motor testing technology, and in particular to a method, apparatus, and system for testing and analyzing the temperature field of a motor stator. Background Technology

[0002] The stator is one of the core components of an electric motor, playing a crucial role. Stator temperature directly affects the motor's performance and lifespan; therefore, temperature field testing of the motor stator is essential. Stator temperature field testing is not only a key step in protecting equipment safety and extending its lifespan, but also an important means of ensuring the motor's efficient and stable operation.

[0003] Currently, the temperature field of the motor stator is mainly obtained through simulation. However, there are still differences between the temperature field of the stator obtained by simulation and the actual temperature field, which is not conducive to subsequent data analysis. Summary of the Invention

[0004] This invention provides a method, apparatus, and system for testing and analyzing the temperature field of a motor stator, in order to solve the problem that the temperature field of the stator obtained by simulation in the prior art still differs from the actual temperature field, which is not conducive to subsequent data analysis.

[0005] The present invention provides a method for testing and analyzing the temperature field of a motor stator. The method includes: acquiring multiple first temperature values ​​and second temperature values ​​under preset test conditions. The first temperature values ​​are collected by a first thermocouple sensor, and the second temperature values ​​are collected by a second thermocouple sensor. The first thermocouple sensor is disposed inside the coil of the stator core of the motor, and the second thermocouple sensor is disposed in the groove of the stator core. The groove is distributed on the periphery of the stator core.

[0006] Based on the first temperature value and the second temperature value, the fitting data of the stator temperature field is obtained;

[0007] Based on the fitted data, abnormal temperature points are identified and future changes in the temperature field are predicted.

[0008] In one embodiment of the present invention, the measuring end of the first thermocouple sensor is embedded in the stator groove of the stator core, the coil covers the first thermocouple sensor, and the lead end of the first thermocouple sensor is connected to a preset temperature acquisition device.

[0009] The measuring end of the second thermocouple sensor is disposed in the groove of the stator core, and the lead-out end of the second thermocouple sensor is connected to the temperature acquisition device; both the first temperature value and the second temperature value are acquired using the temperature acquisition device.

[0010] In one embodiment of the present invention, the first thermocouple sensor is arranged such that at least one first thermocouple sensor is provided inside the coil of the stator core at intervals of one phase sequence.

[0011] The second thermocouple sensor is arranged such that multiple second thermocouple sensors are evenly arranged around the stator core according to a preset distribution interval, wherein the distribution interval is one or more of the grooves.

[0012] In one embodiment of the present invention, it further includes: under preset test conditions, obtaining a third temperature value of the U-phase copper plate, a fourth temperature value of the V-phase copper plate, and a fifth temperature value of the W-phase copper plate of the stator core, wherein the U-phase copper plate refers to the copper terminal of the U-phase coil lead wire, the V-phase copper plate refers to the copper terminal of the V-phase coil lead wire, and the W-phase copper plate refers to the copper terminal of the W-phase coil lead wire.

[0013] The step of obtaining the stator temperature field fitting data based on the first temperature value and the second temperature value includes: performing linear fitting based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, and the fifth temperature value to obtain the stator temperature field fitting data.

[0014] In one embodiment of the present invention, the step of identifying abnormal temperature points based on the fitted data includes:

[0015] Obtain the mean and standard deviation of multiple temperature points in the fitted data;

[0016] The product of the standard deviation and the preset target multiple is determined as the median value;

[0017] The difference between the mean and the median is determined as a first value, and the sum of the mean and the median is determined as a second value.

[0018] Based on the first value and the second value, the target threshold range is obtained;

[0019] Temperature points in the fitted data that exceed the target threshold range are identified as abnormal temperature points.

[0020] Based on the fitted data, the steps for predicting future changes in the temperature field include:

[0021] Based on the fitted data, time series prediction is performed to obtain multiple predicted temperature values ​​of the motor stator temperature field, thereby completing the prediction of future changes in the temperature field.

[0022] In one embodiment of the present invention, the method further includes: identifying temperature fluctuations and evaluating stator cooling conditions based on the fitted data;

[0023] Based on the fitted data, the steps for identifying temperature fluctuations include:

[0024] Based on the fitted data of the stator temperature field, temperature fluctuation parameters are obtained. The temperature fluctuation parameters include: the variance, standard deviation, extreme values, and range of multiple temperature points in the fitted data. The range refers to the difference between the maximum and minimum values ​​of the temperature points in the fitted data.

[0025] Based on the temperature fluctuation parameters, the temperature fluctuation situation is identified;

[0026] The steps for evaluating stator cooling conditions based on the fitted data include:

[0027] The fitting data of the stator temperature field under different cooling conditions are obtained. The cooling conditions are preset conditions, including the coolant temperature and coolant flow rate of the stator cooling system.

[0028] Based on the fitted data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the evaluation of stator cooling conditions.

[0029] In one embodiment of the present invention, the test conditions include steady-state temperature rise test conditions;

[0030] The steady-state temperature rise test condition refers to controlling the motor speed to rise steadily under preset test conditions. When the motor outputs a stable rated torque, the target parameters are periodically collected according to the preset first acquisition frequency until the preset first termination condition is met.

[0031] The test conditions include: cooling conditions, test voltage, operating mode, and the amount of oil added by the external oil pump. The test voltage refers to the voltage provided to the motor. The operating mode includes electric mode and generator mode. The external oil pump refers to the oil pump that provides circulating cooling power to the stator cooling system during this test. The rated torque is a preset torque value. The target parameters include: a first temperature value, a second temperature value, motor voltage, motor current, motor torque, and motor speed. The first termination condition is that the target temperature parameter is less than a preset first temperature threshold, or the first temperature value is greater than a preset second temperature threshold. The target temperature parameter refers to the difference between the maximum and minimum values ​​among the continuously collected target temperature values.

[0032] In one embodiment of the present invention, the test condition further includes a transient temperature rise test condition;

[0033] The transient temperature rise test condition refers to, under preset test conditions, increasing the motor speed from 0 to a target speed value according to a preset rise time, and controlling the motor to run at the target speed value for a preset duration. When the motor output torque is a preset peak torque or the motor power reaches a preset peak power, the target parameters are periodically collected according to a preset second collection frequency until a preset second termination condition is met. The second termination condition is that the cumulative collection time is greater than or equal to a preset time threshold, or an over-temperature fault is detected. The first collection frequency is less than the second collection frequency.

[0034] The present invention also provides a device for testing and analyzing the temperature field of an electric motor stator, the device comprising:

[0035] The temperature value acquisition module is used to acquire multiple first temperature values ​​and second temperature values ​​under preset test conditions. The first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor. The first thermocouple sensor is installed inside the coil of the stator core of the motor, and the second thermocouple sensor is installed in the groove of the stator core. The groove is distributed on the periphery of the stator core.

[0036] The fitting module is used to obtain fitting data of the stator temperature field based on the first temperature value and the second temperature value;

[0037] The analysis module is used to identify abnormal temperature points and predict future changes in the temperature field based on the fitted data.

[0038] This invention also provides a system for testing and analyzing the temperature field of a motor stator, comprising:

[0039] The device includes a first thermocouple sensor, a second thermocouple sensor, a temperature acquisition device, and a motor stator temperature field testing and analysis device as described above.

[0040] The first thermocouple sensor is disposed inside the coil of the stator core, and the second thermocouple sensor is disposed in the groove of the stator core. Both the first thermocouple sensor and the second thermocouple sensor are connected to the input terminal of the temperature acquisition device, and the output terminal of the temperature acquisition device is connected to the motor stator temperature field testing and analysis device.

[0041] The beneficial effects of this invention are as follows: The method, apparatus, and system for testing and analyzing the stator temperature field of a motor proposed in this invention acquire multiple first and second temperature values ​​under preset test conditions. The first temperature value is collected by a first thermocouple sensor, and the second temperature value is collected by a second thermocouple sensor. The first thermocouple sensor is installed inside the coil of the stator core of the motor, and the second thermocouple sensor is installed in a groove in the stator core, with the grooves distributed around the periphery of the stator core. Based on the first and second temperature values, fitted data of the stator temperature field is obtained. Based on the fitted data, abnormal temperature points are identified, and future changes in the temperature field are predicted. This method achieves actual measurement of the internal and external temperatures of the stator core. Compared with temperature field data simulation, the fitted data of the temperature field obtained by this method has higher accuracy, which helps to improve the accuracy of subsequent data analysis. Furthermore, by performing stator temperature field analysis based on the fitted data, i.e., identifying abnormal temperature points and predicting future changes in the temperature field, diversified utilization of the fitted data of the stator temperature field can be achieved. Attached Figure Description

[0042] Figure 1 This is a flowchart illustrating a method for testing and analyzing the temperature field of a motor stator according to an embodiment of the present invention.

[0043] Figure 2 This is a schematic diagram of the stator structure provided in one embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the stator structure for arranging thermocouple sensors according to an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of a motor stator temperature field testing and analysis device provided in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of a motor stator temperature field testing and analysis system provided in an embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0048] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0050] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0051] The following is combined with Figures 1 to 6 This paper explains and describes the method, apparatus, system, and electronic equipment for testing and analyzing the temperature field of motor stator provided by the present invention.

[0052] Please see Figure 1 , Figure 1 This is a flowchart illustrating a method for testing and analyzing the temperature field of a motor stator according to an embodiment of the present invention, as shown below. Figure 1 As shown, the method for testing and analyzing the temperature field of the motor stator includes:

[0053] S110: Under preset test conditions, acquire multiple first temperature values ​​and second temperature values. The first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor. The first thermocouple sensor is located inside the coil of the stator core of the motor, and the second thermocouple sensor is located in the groove of the stator core. The groove is distributed around the stator core.

[0054] It should be noted that due to the tight fit between the stator and rotor of the motor, with a very small gap between them, and the relative rotation between them, there are certain difficulties in actual temperature testing. For example, placing a temperature sensor outside the stator coil can easily damage the sensor when the stator and rotor move relative to each other, and there is also a risk of wire tangling, leading to temperature acquisition failure. This embodiment takes the above problems into consideration. Utilizing the structural characteristics of thermocouple sensors (i.e., thermocouple sensors are composed of two different metal (or alloy) wires connected together, with the junction of the two wires being the measurement point, where a thermoelectric effect is generated to measure temperature changes), the first thermocouple sensor is placed inside the stator core coil. This allows for the acquisition of the internal temperature of the stator (stator core) while avoiding damage to the first thermocouple sensor, effectively reducing the risk of wire tangling.

[0055] It should also be noted that by setting a second thermocouple sensor in the groove of the stator core, the external temperature of the stator core can be collected more effectively.

[0056] It should be mentioned that there are multiple first thermocouple sensors and multiple second thermocouple sensors to meet the requirements for obtaining the stator temperature field.

[0057] S120: Based on the first temperature value and the second temperature value, obtain the fitting data of the stator temperature field.

[0058] Specifically, based on the first temperature value, the second temperature value, and a preset fitting function, a linear fit is performed on the temperature field data to obtain the fitted data of the stator temperature field. The fitting function can be set according to actual conditions, such as a Gaussian function, a linear function, or an exponential function.

[0059] It should be noted that by performing linear fitting of the temperature field data based on the first and second temperature values, highly accurate stator temperature field fitting data can be obtained. Furthermore, this method enables real-time monitoring of the temperature at different locations on the stator, facilitating a more accurate assessment of the motor stator's temperature rise characteristics and heat dissipation effect.

[0060] S130: Based on the fitted data, identify abnormal temperature points and predict future changes in the temperature field.

[0061] It should be noted that by identifying abnormal temperature points and predicting future temperature field changes based on the fitted data, the accuracy of both the identification results and the prediction results can be well guaranteed. Furthermore, by identifying abnormal temperature points and predicting future temperature field changes, users can easily understand and control the stator temperature field situation, with low cost and high flexibility.

[0062] In some embodiments, the measuring end of the first thermocouple sensor is embedded in the stator groove of the stator core, the coil covers the first thermocouple sensor, and the lead-out end of the first thermocouple sensor is connected to a preset temperature acquisition device.

[0063] It should be noted that the stator core has multiple stator grooves inside, and coils are embedded in these grooves. In the above embodiment, the measuring end of a first thermocouple sensor is embedded in the stator groove, and the lead-out end of the first thermocouple sensor is connected to a temperature acquisition device. After embedding the first thermocouple sensor, the coil is embedded in the stator groove, that is, the coil covers the first thermocouple sensor wire bundle, thereby realizing real-time acquisition of the temperature inside the stator (stator core), i.e., real-time acquisition of the first temperature value. The above method can effectively avoid the risk of wire twisting during stator rotation and significantly improve the space utilization of the stator.

[0064] In some embodiments, the measuring end of the second thermocouple sensor is disposed in a groove in the stator core, and the lead-out end of the second thermocouple sensor is connected to the temperature acquisition device; both the first temperature value and the second temperature value are acquired using the temperature acquisition device.

[0065] It should be noted that by adopting the above method, placing the second thermocouple sensor in the groove of the stator core can facilitate the acquisition of the outer temperature of the stator core and the acquisition of the second temperature value, thereby facilitating the subsequent acquisition of fitting data of the stator temperature field.

[0066] In some embodiments, the first thermocouple sensor is arranged such that at least one first thermocouple sensor is provided inside the coil of the stator core at intervals of one phase sequence.

[0067] It should be noted that the stator core coil includes three phase sequences: U, V, and W. The coils are distributed inside the stator core, i.e., within the stator recesses, according to these three phase sequences. By placing at least one of the first thermocouple sensors every other phase sequence inside the stator core coils, the requirements for temperature acquisition inside the stator core can be met while reducing layout costs and improving sensor layout efficiency.

[0068] Normally, the coils in the stator core are arranged in a phase sequence every two stator slots. For example, the coils in the first and second stator slots are phase U, the coils in the third and fourth stator slots are phase V, the coils in the fifth and sixth stator slots are phase W, the coils in the seventh and eighth stator slots are phase U, and so on.

[0069] For example, assuming that two stator slots correspond to a phase sequence, a first thermocouple sensor is embedded in the first and second stator slots respectively. Then, skipping the third and fourth stator slots, a first thermocouple sensor is embedded in the fifth and sixth stator slots respectively, and so on, to complete the arrangement of thermocouple sensors inside the stator core.

[0070] It is worth mentioning that by setting the first thermocouple sensor at different positions inside the stator core, it is easy to capture subtle changes in the temperature of the stator core coil (winding).

[0071] In some embodiments, the second thermocouple sensors are arranged such that a plurality of the second thermocouple sensors are evenly disposed around the stator core according to a preset distribution interval, wherein the distribution interval is the interval between one or more of the grooves.

[0072] It should be noted that the distribution interval can be set according to actual conditions, such as an interval of 5 grooves or an interval of 6 grooves. By evenly distributing multiple second thermocouple sensors around the stator core, the external temperature of the stator core can be effectively collected. It is worth mentioning that by placing second thermocouple sensors at different positions around the stator core, subtle changes in the temperature around the stator core can be easily detected.

[0073] In some embodiments, the method further includes: under preset test conditions, obtaining a third temperature value of the U-phase copper plate, a fourth temperature value of the V-phase copper plate, and a fifth temperature value of the W-phase copper plate of the stator core, wherein the U-phase copper plate refers to the copper terminal of the U-phase coil lead, the V-phase copper plate refers to the copper terminal of the V-phase coil lead, and the W-phase copper plate refers to the copper terminal of the W-phase coil lead.

[0074] It should be noted that, in addition to obtaining the first and second temperature values, the above embodiment also acquires the third temperature value of the U-phase copper plate, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate of the stator core, which further ensures the comprehensiveness of the stator temperature field data. Compared to acquiring only the first and second temperature values, or only the third temperature value of the U-phase copper plate, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate, the above method better ensures the comprehensiveness of the acquired data.

[0075] Specifically, a third thermocouple sensor is arranged on the three-phase copper plates to obtain the third temperature value of the U-phase copper plate, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate of the stator core. The method of arranging the third thermocouple sensors on the three-phase copper plates is as follows: one third thermocouple sensor is installed on each of the U-phase, V-phase, and W-phase copper plates. The leads of the third thermocouple sensors are connected to the temperature acquisition device.

[0076] It should also be noted that by obtaining the third temperature value of the U-phase copper plate, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate of the stator core, the balance of the three-phase current can be evaluated, which helps to find potential problems in the motor operation process, such as the imbalance of the three-phase current.

[0077] Further, the step of obtaining the stator temperature field fitting data based on the first temperature value and the second temperature value includes: performing linear fitting based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, and the fifth temperature value to obtain the stator temperature field fitting data.

[0078] It should be noted that by performing linear fitting based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, and the fifth temperature value, the fitting data of the stator temperature field is obtained with high accuracy and strong comprehensiveness.

[0079] Specifically, based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, the fifth temperature value, and a preset fitting function, linear fitting of the temperature field data is performed to obtain the fitting data of the stator temperature field.

[0080] In some embodiments, regarding the arrangement of the sensors, temperature sensors (such as thermocouple sensors) can be arranged around the oil pan of the motor, i.e., the motor housing, to collect the spatial temperature distribution of the oil pan and ensure the temperature uniformity of the oil pan. Furthermore, by acquiring the temperature data around the oil pan, it is easier to analyze the heat conduction path from the stator to the oil pan, thereby optimizing the cooling system and improving the overall cooling and heat dissipation effect.

[0081] The following specific embodiment will be used to explain the steps of stator placement (arranging thermocouple sensors) in the above embodiment.

[0082] First, the motor is disassembled, and the stator assembly is removed. For example, the motor housing is heated in a high-temperature chamber to remove the stator assembly.

[0083] Secondly, prepare the tools, including: spot welding machine, thermocouple sensor, heat shrink tubing, AB glue, string, and other tools.

[0084] Then, the placement of points is carried out, that is, the placement of thermocouple sensors.

[0085] Specifically, regarding the internal arrangement of the stator core: Assume the stator core contains 48 stator slots, with each pair of slots corresponding to a coil phase sequence. For example, the coil phase sequence in the second and third slots is U phase, in the fourth and fifth slots it's V phase, in the sixth and seventh slots it's W phase, and in the eighth and ninth slots it's U phase, and so on. Therefore, by arranging two stator slots every other slot, the first thermocouple sensor can be arranged. Arranging two stator slots means embedding one first thermocouple sensor in each of the two stator slots. The specific arrangement is as follows:

[0086] U-phase arrangement grooves (stator grooves where U-phase is arranged) numbered: 2 / 3, 14 / 15, 26 / 27, 38 / 39;

[0087] V-phase arrangement grooves (stator grooves where U-phase is arranged) numbered: 10 / 11, 22 / 23, 34 / 35, 46 / 47;

[0088] W-phase arrangement grooves (stator grooves where U-phase is arranged) numbered: 6 / 7, 18 / 19, 30 / 31, 42 / 43.

[0089] The "2 / 3" mentioned above refers to the second and third stator grooves, and the remaining numbers follow the same pattern.

[0090] Regarding the placement of sensors around the stator core (grooves): a second thermocouple sensor is placed every six grooves. In this embodiment, six second thermocouple sensors are exemplarily placed around the stator core.

[0091] Regarding the placement of the three-phase copper plates: a third thermocouple sensor is installed on each of the U-phase, V-phase, and W-phase copper plates.

[0092] Regarding the placement of sensors in the oil pan: Temperature sensors (such as thermocouple sensors) are placed at different locations around the oil pan to facilitate the acquisition of spatial temperature distribution data in the oil pan and ensure the uniformity of temperature within the oil pan.

[0093] Table 1 below shows a reference table of the internal layout of the stator core:

[0094] Table 1. Comparison of internal layout points of stator core

[0095]

[0096] The channels in Table 1 above refer to sensor channels; for example, each thermocouple sensor corresponds to one channel. The groove number refers to the corresponding stator groove number.

[0097] Table 2 below shows a comparison table of the three-phase copper plate layout and the trench layout:

[0098] Table 2 Comparison of Three-Phase Bronze Plate Layout and Groove Layout

[0099] aisle 25 26 27 28 29 30 31 32 33 Bronze Plate Sequence / Groove Number U phase V phase W phase 1 8 15 22 29 36

[0100] After completing the above-mentioned sampling point layout, high-temperature assembly is performed. This involves placing the motor housing in a high-temperature chamber for heating (e.g., at 180°C for 4 hours), then installing the stator into the housing and completing the assembly according to the standard assembly procedure. It is important to note that a through hole (approximately 20mm in size) is made at the rear of the housing for leading out the sensor wiring harness. This sampling point layout method effectively captures the temperature of the stator core's interior, exterior, and three-phase copper plates, facilitating subsequent temperature field data analysis. Furthermore, it also allows for temperature capture of the oil pan, enabling the acquisition of the spatial temperature distribution within the oil pan, thereby optimizing the cooling system and improving overall heat dissipation.

[0101] Figure 2 This is a schematic diagram of the stator structure provided in one embodiment of the present invention. Please refer to it. Figure 2 The stator includes a stator core 210 and a coil 220, with the coil 220 disposed within a stator groove 2101 of the stator core 210. The coil includes three-phase copper plates 2201 for U, V, and W phases.

[0102] Figure 3 This is a schematic diagram of the stator structure for arranging thermocouple sensors according to an embodiment of the present invention. Please refer to... Figure 3 For example, inside the coil, a first thermocouple sensor 310 (thermocouple sensor harness) is provided at every interval of phase sequence. For instance, a first thermocouple sensor is provided in the stator groove corresponding to phase U, then skipping the stator groove corresponding to phase V, a first thermocouple sensor is provided in the stator groove of phase W, and so on. Multiple second thermocouple sensors 320 (thermocouple sensor harnesses) are evenly arranged in the grooves 2202 surrounding the stator core. A third thermocouple sensor 330 (thermocouple sensor harness) is provided in each of the three phase copper plates 2201.

[0103] In some embodiments, the step of identifying abnormal temperature points based on the fitted data includes:

[0104] 1. Obtain the mean and standard deviation of multiple temperature points in the fitted data.

[0105] 2. The product of the standard deviation and the preset target multiple is determined as the intermediate value.

[0106] Third, the difference between the mean and the median is determined as a first value, and the sum of the mean and the median is determined as a second value.

[0107] IV. Based on the first value and the second value, the target threshold range is obtained;

[0108] 5. Temperature points in the fitted data that exceed the target threshold range are identified as abnormal temperature points.

[0109] It should be noted that the above steps can effectively identify abnormal temperature points with high accuracy.

[0110] In some embodiments, the step of predicting future changes in the temperature field based on the fitted data includes:

[0111] Based on the fitted data, time series prediction is performed to obtain multiple predicted temperature values ​​of the motor stator temperature field, thereby completing the prediction of future changes in the temperature field.

[0112] It should be noted that the ARIMA (Autoregressive Integrated Moving Average) model can be used to perform time series prediction on the fitted data to obtain multiple predicted temperature values ​​for the motor stator temperature field.

[0113] To further analyze the stator temperature field, the motor stator temperature field testing and analysis method also includes: identifying temperature fluctuations and evaluating stator cooling conditions based on the fitted data.

[0114] In some embodiments, the step of identifying temperature fluctuations based on the fitted data includes:

[0115] 1. Based on the fitted data of the stator temperature field, temperature fluctuation parameters are obtained. The temperature fluctuation parameters include: the variance, standard deviation, extreme values, and range of multiple temperature points in the fitted data. The range refers to the difference between the maximum and minimum values ​​of the temperature points in the fitted data.

[0116] 2. Based on the temperature fluctuation parameters, complete the identification of temperature fluctuation conditions.

[0117] It should be noted that the above steps can effectively identify temperature fluctuations in the stator temperature field.

[0118] In some embodiments, the step of evaluating stator cooling conditions based on the fitted data includes:

[0119] 1. Obtain fitting data of stator temperature field under different cooling conditions. The cooling conditions are preset conditions, including: coolant temperature and coolant flow rate of the stator cooling system.

[0120] Second, based on the fitted data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the evaluation of stator cooling conditions.

[0121] It should be noted that the corresponding cooling conditions can be scored manually, or specific scoring indicators (such as volatility) can be set to score the corresponding cooling conditions. It is worth mentioning that the above steps can effectively evaluate the stator cooling conditions.

[0122] To ensure that the test results of the motor stator temperature field are closer to reality, this invention proposes two test conditions: steady-state temperature rise test condition and transient temperature rise test condition. These two test conditions are explained below through examples.

[0123] In some embodiments, the steady-state temperature rise test condition refers to controlling the motor speed to rise steadily under preset test conditions. When the motor outputs a stable rated torque, the target parameters are periodically collected according to a preset first acquisition frequency until the preset first termination condition is met.

[0124] The test conditions include: cooling conditions (coolant temperature and coolant flow rate of the stator cooling system), test voltage, operating mode, and oil pump filling amount. The test voltage refers to the voltage provided to the motor. The operating mode includes electric mode and generator mode. The external oil pump refers to the oil pump that provides circulating cooling power to the stator cooling system during this test. The rated torque is a preset torque value. The target parameters include: first temperature value, second temperature value, motor voltage, motor current, motor torque, and motor speed. The first termination condition is that the target temperature parameter is less than a preset first temperature threshold, or the first temperature value is greater than a preset second temperature threshold. The target temperature parameter refers to the difference between the maximum and minimum values ​​among the continuously collected target temperature values.

[0125] It should be noted that the first sampling frequency can be 30 seconds / time, etc., and the first temperature threshold and the second temperature threshold can be set according to the actual situation, such as the first temperature threshold being 2K (Kelvin) and the second temperature threshold being 120℃, etc.

[0126] For example: Suppose the test conditions are as follows:

[0127] Coolant temperature: 20±2℃; Coolant flow rate: 12±0.5L / min; Test voltage: Rated voltage (650V); Operating mode: Electric mode; Filling capacity: 1.8L.

[0128] The test steps for steady-state temperature rise testing include: setting the rated torque (e.g., 153 Nm), coolant temperature (20±2℃), and coolant flow rate (12±0.5 L / min). Starting from a speed of 1000 rpm, the motor speed and temperature are controlled to rise in 1000 rpm increments, up to a maximum of 18000 rpm. When the motor outputs a stable rated torque or rated power (e.g., 80 kW), target parameters (first temperature value, second temperature value, motor voltage, motor current, motor torque, and motor speed, etc.) are collected every 30 seconds until a preset first termination condition is met, such as the difference between the maximum and minimum values ​​among 10 consecutively collected temperature values ​​being less than 2K, or the first temperature value being greater than 120℃. Based on the first and second temperature values ​​in the target parameters, the stator temperature field fitting data can be obtained. Using the motor voltage, motor current, motor torque, and motor speed data in the target parameters, the operating status of the motor can be monitored.

[0129] Similarly, the coolant temperature can be changed, such as changing the coolant temperature from 20±2℃ to 75±2℃, and the test steps of the above steady-state temperature rise test condition can be repeated to obtain test data (target parameters) under different cooling conditions.

[0130] It should be noted that the steady-state temperature rise test condition in the above embodiments, by acquiring and recording temperature changes over a relatively long period (such as recording the first and second temperature values ​​every 30 seconds), can help identify the stability of the motor stator temperature under steady-state conditions. Based on the data obtained under the steady-state temperature rise test condition, potential temperature fluctuations and anomalies can be identified.

[0131] In some embodiments, the transient temperature rise test condition refers to, under preset test conditions, increasing the motor speed from 0 to a target speed value according to a preset rise time, and controlling the motor to run at the target speed value for a preset duration. When the torque output by the motor is a preset peak torque or the power of the motor reaches a preset peak power, the target parameters are periodically collected according to a preset second collection frequency until a preset second termination condition is met. The second termination condition is that the cumulative collection time is greater than or equal to a preset time threshold, or an over-temperature fault is detected. The first collection frequency is less than the second collection frequency.

[0132] It should be noted that the rise time refers to the time it takes for the motor speed to increase from 0 to the target speed value. The rise time can be set according to actual testing requirements, such as 20s, 30s, 40s, etc. The target speed value is, for example, 18000rpm, and the preset time is, for example, 3s. The speed drop time corresponds to the rise time. The peak power is, for example, 200kW, and the second sampling frequency is, for example, 0.01 seconds / time.

[0133] For example: Suppose the test conditions are as follows:

[0134] Coolant temperature: 20±2℃; Coolant flow rate: 12±0.5L / min; Test voltage: Rated voltage (650V); Operating mode: Electric mode; Filling capacity: 1.8L.

[0135] The test steps for the transient temperature rise test include: setting the peak torque (e.g., 400 Nm), coolant temperature (20±2℃), and coolant flow rate (12±0.5 L / min). Assuming the current rise time is set to 20 seconds, the motor speed will be increased from 0 to the target speed value (an example value of 18000 rpm) within 20 seconds. The motor will then be controlled to run at the target speed value for a preset duration (an example value of 3 seconds). The motor speed decrease time is the same as the rise time, also 20 seconds, meaning the motor speed will be controlled to decrease from 18000 rpm to 0 within 20 seconds. During this process, when the torque output by the motor is the peak torque or the power of the motor reaches the preset peak power (e.g., 200kW), the target parameters are periodically collected at the preset second collection frequency (e.g., 0.01 seconds / time) until the preset second termination condition is met (the cumulative collection time is greater than or equal to the preset time threshold (e.g., 30s), or an over-temperature fault is detected (the MCU (Microcontroller Unit) issues an over-temperature fault warning)).

[0136] Similarly, by changing the rise time, such as changing 20s to 40s or 60s, and repeating the above test steps, the target parameters of the motor under different speed rise conditions can be obtained, thus facilitating a comprehensive understanding of the motor's performance under different operating conditions. Furthermore, the coolant temperature can be changed to perform the above test steps under different cooling conditions.

[0137] It should be noted that by conducting multiple tests under transient temperature rise test conditions, the subtle fluctuations in the transient temperature field of the motor under rapidly changing speed conditions can be captured in real time, thereby providing more refined temperature data (first temperature value, second temperature value, etc.).

[0138] It should also be noted that by combining steady-state temperature rise test conditions and transient temperature rise test conditions, the heating situation of the motor can be reflected in all operating conditions and in the full range, which facilitates comprehensive heat distribution analysis, that is, analyzing the motor stator temperature field under different conditions, which helps to improve the reliability of motor design and operation.

[0139] In addition, once the collected target parameters reach a certain amount, a temperature prediction model based on machine learning can be constructed to predict the temperature changes of various parts of the stator during motor operation in real time, so as to take timely overheat prevention measures.

[0140] It is worth mentioning that the first and second temperature values ​​obtained from the above tests facilitate the observation of the temperature change rate and temperature stability of the stator core. Furthermore, based on the temperature sensor pre-installed on the motor body, the temperature changes of the motor body can be monitored. Moreover, by setting different cooling conditions, the effects of different cooling conditions on the steady-state and transient temperature rise of the stator coils can be obtained.

[0141] The following describes the possible faults that may occur during the testing process and their handling methods:

[0142] Resolver failure: If a resolver failure (GPO) occurs, check whether the internal wiring harness is broken, i.e., whether the thermocouple sensor wiring harness is broken. If broken, replace or repair it in time.

[0143] No communication: When there is no communication signal, the signal can be enhanced by adding a magnetic ring and Velcro.

[0144] Negative speed feedback: If the speed feedback is negative, the positive and negative pins of the rotary converter sine wave need to be adjusted.

[0145] External oil pump is not working: Check if the wiring harness and terminal connections of the external oil pump are normal.

[0146] Sensor temperature reading abnormality: If sensor temperature reading abnormality (Overload) occurs, check whether the sensor spot welding points are normal and confirm the wire harness resistance value.

[0147] Slow temperature acquisition device recording speed: If the temperature acquisition device cannot guarantee a sampling frequency of 1 second / time, the sampling frequency can be adjusted to 3-5 seconds / time, and the corresponding data can be recorded.

[0148] External oil pump supply method issue: If the external oil pump supply method cannot guarantee the amount and temperature of coolant, it is recommended to use an oil temperature controller to ensure the stability of coolant temperature and flow.

[0149] The stator temperature field testing and analysis device for motors provided by the present invention will be described below. The stator temperature field testing and analysis device described below can be referred to in correspondence with the stator temperature field testing and analysis method described above.

[0150] Please refer to Figure 4 The motor stator temperature field testing and analysis device provided in this embodiment includes:

[0151] Temperature value acquisition module 410 is used to acquire multiple first temperature values ​​and second temperature values ​​under preset test conditions. The first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor. The first thermocouple sensor is installed inside the coil of the stator core of the motor, and the second thermocouple sensor is installed in the groove of the stator core. The groove is distributed on the periphery of the stator core.

[0152] The fitting module 420 is used to obtain fitting data of the stator temperature field based on the first temperature value and the second temperature value.

[0153] The analysis module 430 is used to identify abnormal temperature points and predict future changes in the temperature field based on the fitted data. The temperature value acquisition module 410, the fitting module 420, and the analysis module 430 are connected. The motor stator temperature field testing and analysis device in this embodiment effectively measures the actual temperature inside and outside the stator (stator core), achieving high accuracy and improving the accuracy of subsequent data analysis. Furthermore, by performing motor stator temperature field analysis based on the fitted data—that is, identifying abnormal temperature points and predicting future changes in the temperature field—it enables diversified utilization of the fitted data of the stator temperature field, with low cost, strong real-time performance, and high flexibility.

[0154] In some embodiments, the temperature value acquisition module 410 is further configured to acquire, under preset test conditions, the third temperature value of the U-phase copper plate of the stator core, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate, wherein the U-phase copper plate refers to the copper terminal of the U-phase coil lead, the V-phase copper plate refers to the copper terminal of the V-phase coil lead, and the W-phase copper plate refers to the copper terminal of the W-phase coil lead.

[0155] In some embodiments, the fitting module 420 is specifically used to perform linear fitting based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, and the fifth temperature value to obtain fitting data of the stator temperature field.

[0156] In some embodiments, the analysis module 430 is specifically used to obtain the mean and standard deviation of multiple temperature points in the fitted data;

[0157] The product of the standard deviation and the preset target multiple is determined as the median value;

[0158] The difference between the mean and the median is determined as a first value, and the sum of the mean and the median is determined as a second value.

[0159] Based on the first value and the second value, the target threshold range is obtained;

[0160] Temperature points in the fitted data that exceed the target threshold range are identified as abnormal temperature points.

[0161] In some embodiments, the analysis module 430 is further specifically used to perform time series prediction based on the fitted data to obtain multiple predicted temperature values ​​of the motor stator temperature field, so as to complete the prediction of future changes in the temperature field.

[0162] In some embodiments, the analysis module 430 is further specifically used to obtain temperature fluctuation parameters based on the fitted data of the stator temperature field. The temperature fluctuation parameters include: the variance, standard deviation, extreme values, and range of multiple temperature points in the fitted data. The range refers to the difference between the maximum and minimum values ​​of the temperature points in the fitted data.

[0163] Based on the temperature fluctuation parameters, the temperature fluctuation situation is identified.

[0164] In some embodiments, the analysis module 430 is further specifically used to acquire fitting data of the stator temperature field under different cooling conditions, wherein the cooling conditions are preset conditions, and the cooling conditions include: the coolant temperature and coolant flow rate of the stator cooling system;

[0165] Based on the fitted data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the evaluation of stator cooling conditions.

[0166] Please refer to Figure 5 This embodiment also provides a motor stator temperature field testing and analysis system, including:

[0167] The device includes a first thermocouple sensor 310, a second thermocouple sensor 320, a temperature acquisition device 510, and a motor stator temperature field testing and analysis device 520 as described above.

[0168] The first thermocouple sensor 310 is disposed inside the coil of the stator core, and the second thermocouple sensor 320 is disposed in the groove of the stator core. Both the first thermocouple sensor 310 and the second thermocouple sensor 320 are connected to the input terminal of the temperature acquisition device 510, and the output terminal of the temperature acquisition device 510 is connected to the motor stator temperature field testing and analysis device 520. The motor stator temperature field testing and analysis system in this embodiment can effectively test the temperature field of the motor stator with high accuracy, and can also effectively analyze the temperature field of the motor stator with high flexibility and low cost.

[0169] In some embodiments, an electronic device is also provided, which may be a server, and its internal structure diagram is shown below. Figure 6 As shown, the electronic device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used to communicate with external clients via a network connection. When the computer program is executed by the processor, it implements the functions or steps of the server-side method described above.

[0170] In some embodiments, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the following steps: under a preset test condition, acquiring multiple first temperature values ​​and second temperature values, wherein the first temperature values ​​are acquired by a first thermocouple sensor, and the second temperature values ​​are acquired by a second thermocouple sensor. The first thermocouple sensor is disposed inside the coil of the stator core of the motor, and the second thermocouple sensor is disposed in the groove of the stator core, the groove being distributed around the periphery of the stator core; based on the first temperature values ​​and the second temperature values, obtaining fitting data of the stator temperature field; and based on the fitting data, identifying abnormal temperature points and predicting future changes in the temperature field.

[0171] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it performs the following steps: under a preset test condition, acquiring multiple first temperature values ​​and second temperature values, wherein the first temperature values ​​are acquired by a first thermocouple sensor and the second temperature values ​​are acquired by a second thermocouple sensor, wherein the first thermocouple sensor is disposed inside the coil of the stator core of the motor and the second thermocouple sensor is disposed in the groove of the stator core, the groove being distributed around the periphery of the stator core; based on the first temperature values ​​and the second temperature values, obtaining fitting data of the stator temperature field; and based on the fitting data, identifying abnormal temperature points and predicting future changes in the temperature field.

[0172] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or electronic device described above can be referred to the relevant descriptions on the server side and client side in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0173] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0174] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for testing and analyzing the temperature field of an electric motor stator, characterized in that, include: Under preset test conditions, multiple first temperature values ​​and second temperature values ​​are acquired. The first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor. The first thermocouple sensor is located inside the coil of the stator core of the motor, and the second thermocouple sensor is located in the groove of the stator core. The groove is distributed around the periphery of the stator core. Based on the first temperature value and the second temperature value, the fitting data of the stator temperature field is obtained; Based on the fitted data, abnormal temperature points are identified and future changes in the temperature field are predicted. Based on the fitted data, the steps for identifying abnormal temperature points include: Obtain the mean and standard deviation of multiple temperature points in the fitted data; The product of the standard deviation and the preset target multiple is determined as the median value; The difference between the mean and the median is determined as a first value, and the sum of the mean and the median is determined as a second value. Based on the first value and the second value, the target threshold range is obtained; Temperature points in the fitted data that exceed the target threshold range are identified as abnormal temperature points.

2. The method for testing and analyzing the temperature field of a motor stator according to claim 1, characterized in that, The measuring end of the first thermocouple sensor is embedded in the stator groove of the stator core, the coil covers the first thermocouple sensor, and the lead end of the first thermocouple sensor is connected to a preset temperature acquisition device. The measuring end of the second thermocouple sensor is disposed in the groove of the stator core, and the lead-out end of the second thermocouple sensor is connected to the temperature acquisition device; both the first temperature value and the second temperature value are acquired using the temperature acquisition device.

3. The method for testing and analyzing the temperature field of a motor stator according to claim 1 or 2, characterized in that, The first thermocouple sensor is arranged such that at least one first thermocouple sensor is set inside the coil of the stator core at intervals of one phase sequence. The second thermocouple sensor is arranged such that multiple second thermocouple sensors are evenly arranged around the stator core according to a preset distribution interval, wherein the distribution interval is one or more of the grooves.

4. The method for testing and analyzing the temperature field of a motor stator according to claim 1 or 2, characterized in that, Also includes: Under preset test conditions, the third temperature value of the U-phase copper plate, the fourth temperature value of the V-phase copper plate, and the fifth temperature value of the W-phase copper plate of the stator core are obtained. The U-phase copper plate refers to the copper terminal of the U-phase coil lead wire, the V-phase copper plate refers to the copper terminal of the V-phase coil lead wire, and the W-phase copper plate refers to the copper terminal of the W-phase coil lead wire. The step of obtaining the stator temperature field fitting data based on the first temperature value and the second temperature value includes: performing linear fitting based on the first temperature value, the second temperature value, the third temperature value, the fourth temperature value, and the fifth temperature value to obtain the stator temperature field fitting data.

5. The method for testing and analyzing the temperature field of a motor stator according to claim 1, characterized in that, Based on the fitted data, the steps for predicting future changes in the temperature field include: Based on the fitted data, time series prediction is performed to obtain multiple predicted temperature values ​​of the motor stator temperature field, thereby completing the prediction of future changes in the temperature field.

6. The method for testing and analyzing the temperature field of a motor stator according to claim 1 or 5, characterized in that, Also includes: Based on the fitted data, temperature fluctuations are identified and stator cooling conditions are assessed. Based on the fitted data, the steps for identifying temperature fluctuations include: Based on the fitted data of the stator temperature field, temperature fluctuation parameters are obtained. The temperature fluctuation parameters include: the variance, standard deviation, extreme values, and range of multiple temperature points in the fitted data. The range refers to the difference between the maximum and minimum values ​​of the temperature points in the fitted data. Based on the temperature fluctuation parameters, the temperature fluctuation situation is identified; The steps for evaluating stator cooling conditions based on the fitted data include: The fitting data of the stator temperature field under different cooling conditions are obtained. The cooling conditions are preset conditions, including the coolant temperature and coolant flow rate of the stator cooling system. Based on the fitted data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the evaluation of stator cooling conditions.

7. The method for testing and analyzing the temperature field of a motor stator according to claim 6, characterized in that, The test conditions include steady-state temperature rise test conditions; The steady-state temperature rise test condition refers to controlling the motor speed to rise steadily under preset test conditions. When the motor outputs a stable rated torque, the target parameters are periodically collected according to the preset first acquisition frequency until the preset first termination condition is met. The test conditions include: cooling conditions, test voltage, operating mode, and the amount of oil added by the external oil pump. The test voltage refers to the voltage provided to the motor. The operating mode includes electric mode and generator mode. The external oil pump refers to the oil pump that provides circulating cooling power to the stator cooling system during this test. The rated torque is a preset torque value. The target parameters include: a first temperature value, a second temperature value, motor voltage, motor current, motor torque, and motor speed. The first termination condition is that the target temperature parameter is less than a preset first temperature threshold, or the first temperature value is greater than a preset second temperature threshold. The target temperature parameter refers to the difference between the maximum and minimum values ​​among the continuously collected target temperature values.

8. The method for testing and analyzing the temperature field of a motor stator according to claim 7, characterized in that, The test conditions also include transient temperature rise test conditions; The transient temperature rise test condition refers to, under preset test conditions, increasing the motor speed from 0 to a target speed value according to a preset rise time, and controlling the motor to run at the target speed value for a preset duration. When the motor output torque is a preset peak torque or the motor power reaches a preset peak power, the target parameters are periodically collected according to a preset second collection frequency until a preset second termination condition is met. The second termination condition is that the cumulative collection time is greater than or equal to a preset time threshold, or an over-temperature fault is detected. The first collection frequency is less than the second collection frequency.

9. A device for testing and analyzing the temperature field of a motor stator, characterized in that, include: The temperature value acquisition module is used to acquire multiple first temperature values ​​and second temperature values ​​under preset test conditions. The first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor. The first thermocouple sensor is installed inside the coil of the stator core of the motor, and the second thermocouple sensor is installed in the groove of the stator core. The groove is distributed on the periphery of the stator core. The fitting module is used to obtain fitting data of the stator temperature field based on the first temperature value and the second temperature value; The analysis module is used to identify abnormal temperature points and predict future changes in the temperature field based on the fitted data. The analysis module is specifically used to obtain the mean and standard deviation of multiple temperature points in the fitted data; and to determine the intermediate value by multiplying the standard deviation by a preset target multiple. The difference between the mean and the median is determined as a first value, and the sum of the mean and the median is determined as a second value; based on the first value and the second value, a target threshold range is obtained; temperature points in the fitted data that exceed the target threshold range are determined as abnormal temperature points.

10. A system for testing and analyzing the temperature field of a motor stator, characterized in that, include: The device comprises a first thermocouple sensor, a second thermocouple sensor, a temperature acquisition device, and a motor stator temperature field testing and analysis device as described in claim 9. The first thermocouple sensor is disposed inside the coil of the stator core, and the second thermocouple sensor is disposed in the groove of the stator core. Both the first thermocouple sensor and the second thermocouple sensor are connected to the input terminal of the temperature acquisition device, and the output terminal of the temperature acquisition device is connected to the motor stator temperature field testing and analysis device.

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