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

Abstract

The invention relates to the technical field of motor testing, in particular to a motor stator temperature field testing and analyzing method, device and system, and the method comprises the steps: obtaining a plurality of first temperature values and second temperature values under a preset testing condition, the second temperature value is collected by a second thermocouple sensor, the first thermocouple sensor is arranged in a coil of a stator core of the motor, the second thermocouple sensor is arranged in a groove of the stator core, and the groove is distributed on the periphery of the stator core; obtaining fitting data of the stator temperature field based on the first temperature value and the second temperature value; on the basis of fitting data, abnormal temperature point identification and temperature field future change prediction are carried out; according to the method, the actual measurement of the internal temperature and the peripheral temperature of the stator is realized, and compared with temperature field data simulation, the precision of the fitting data of the temperature field obtained by the method is relatively high, and the improvement of the precision of subsequent data analysis is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a method, device and system for testing and analyzing the temperature field of a motor stator. Background Art

[0002] The stator is one of the core components of the motor and plays a vital role in the motor. The stator temperature directly affects the performance and life of the motor. Therefore, it is very important to perform temperature field testing on the motor stator. The motor stator temperature field test is not only a key step to protect the safety of the equipment and extend the life of the equipment, but also an important means to ensure the efficient and stable operation of the motor.

[0003] At present, the temperature field of the stator of the motor is mainly obtained by simulation. However, there is still a difference 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] The present invention provides a method, device and system for testing and analyzing the temperature field of a motor stator, so as to solve the problem in the prior art that there is still a difference between the temperature field of the stator obtained by simulation means and 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 comprising: obtaining a plurality of first temperature values ​​and a second temperature value under a preset test condition, wherein the first temperature value is collected by a first thermocouple sensor, and the second temperature value is collected by a second thermocouple sensor, wherein the first thermocouple sensor is arranged inside a coil of a stator core of the motor, and the second thermocouple sensor is arranged in a groove of the stator core, and the grooves are distributed around the periphery of the stator core;

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

[0007] Based on the fitting 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 buried 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;

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

[0010] In one embodiment of the present invention, the first thermocouple sensor is arranged in such a manner that at least one first thermocouple sensor is arranged every other phase sequence inside the coil of the stator core;

[0011] The second thermocouple sensors are arranged in such a manner that a plurality of the second thermocouple sensors are evenly arranged on the periphery of the stator core according to a preset distribution interval, and the distribution interval is an interval of one or more of the grooves.

[0012] In one embodiment of the present invention, it also includes: under a preset test condition, obtaining a third temperature value of the U-phase copper plate of the stator core, a fourth temperature value of the V-phase copper plate, and a 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 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 fitting data of the stator temperature field 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 fitting data of the stator temperature field.

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

[0015] Obtaining the mean and standard deviation of multiple temperature points in the fitting data;

[0016] Determine the product of the standard deviation and the preset target multiple as the intermediate value;

[0017] Determine a difference between the mean and the middle value as a first value, and determine a sum of the mean and the middle value as a second value;

[0018] Based on the first value and the second value, obtaining a target threshold range;

[0019] Determining a temperature point in the fitting data that exceeds the target threshold range as an abnormal temperature point;

[0020] Based on the fitting data, the steps of predicting the future change of the temperature field include:

[0021] Based on the fitting data, time series prediction is performed to obtain multiple predicted temperature values ​​of the motor stator temperature field to complete 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 fitting data;

[0023] Based on the fitting data, the step of identifying the temperature fluctuation condition comprises:

[0024] Based on the fitting data of the stator temperature field, a temperature fluctuation parameter is obtained, wherein the temperature fluctuation parameter includes: a variance, a standard deviation, an extreme value and a range of a plurality of temperature points of the fitting data, wherein the range refers to a difference between a maximum value and a minimum value of a temperature point in the fitting data;

[0025] Based on the temperature fluctuation parameters, completing temperature fluctuation situation identification;

[0026] Based on the fitting data, the step of evaluating the stator cooling condition comprises:

[0027] Acquire fitting data of the stator temperature field under different cooling conditions, where the cooling conditions are preset conditions, and the cooling conditions include: the coolant temperature and coolant flow rate of the stator cooling system;

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

[0029] In one embodiment of the present invention, the test condition includes a steady-state temperature rise test condition;

[0030] The steady-state temperature rise test condition refers to controlling the motor speed to increase steadily under preset test conditions, and when the motor outputs a stable rated torque, regularly collecting target parameters according to a preset first collection frequency until a preset first end condition is met;

[0031] The test conditions include: cooling conditions, test voltage, working mode, and the amount of oil filled by the external oil pump. The test voltage refers to the voltage provided to the motor. The working mode includes the electric mode and the power generation mode. The external oil pump refers to the oil pump that provides circulating cooling power for 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, a motor voltage, a motor current, a motor torque, and a motor speed. The first end 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 ​​of a target number of temperature values ​​collected continuously.

[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 increasing the speed of the motor from 0 to a target speed value according to a preset rise time under preset test conditions, and controlling the motor to run at the target speed value for a preset time. 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 regularly 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 motor stator temperature field testing and analysis device, the device comprising:

[0035] A temperature value acquisition module, used to acquire a plurality of first temperature values ​​and second temperature values ​​under a preset test condition, wherein the first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor, wherein the first thermocouple sensor is disposed inside a coil of a stator core of the motor, and the second thermocouple sensor is disposed in a groove of the stator core, and the grooves are distributed around the periphery of the stator core;

[0036] A fitting module, used for obtaining fitting data of a 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 fitting data.

[0038] The present invention also provides a motor stator temperature field testing and analysis system, comprising:

[0039] A first thermocouple sensor, a second thermocouple sensor, a temperature acquisition device, and the motor stator temperature field testing and analysis device as described above;

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

[0041] Beneficial effects of the present invention: The present invention proposes a method, device and system for testing and analyzing the temperature field of a motor stator. The method obtains a plurality of first temperature values ​​and second temperature values ​​under a preset test condition. 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 arranged inside the coil of the stator core of the motor, and the second thermocouple sensor is arranged in the groove of the stator core, and 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 fitting data, abnormal temperature points are identified and future changes of the temperature field are predicted. The method realizes the actual measurement of the internal temperature and the peripheral temperature of the stator core. Compared with the temperature field data simulation, the fitting data of the temperature field obtained by the method has a higher accuracy, which helps to improve the accuracy of subsequent data analysis. And by analyzing the stator temperature field of the motor based on the fitting data, that is, identifying abnormal temperature points and predicting future changes of the temperature field, etc., the diversified use of the fitting data of the stator temperature field can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of a flow chart of a method for testing and analyzing a motor stator temperature field according to an embodiment of the present invention;

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

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

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

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

[0047] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0050] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0051] Combine the following Figures 1 to 6 , the motor stator temperature field testing and analysis method, device, system, and electronic equipment provided by the present invention are explained.

[0052] See also Figure 1 , Figure 1 A schematic diagram of a flow chart of a method for testing and analyzing a motor stator temperature field according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, the motor stator temperature field test and analysis method includes:

[0053] S110: Under a preset test condition, multiple first temperature values ​​and second temperature values ​​are obtained, wherein the first temperature value is collected by a first thermocouple sensor, and the second temperature value is collected by a second thermocouple sensor, wherein the first thermocouple sensor is disposed inside a coil of a stator core of the motor, and the second thermocouple sensor is disposed in a groove of the stator core, and the grooves are distributed around the stator core.

[0054] It should be noted that, since the stator and rotor of the motor fit closely, the gap between them is very small, and there is relative rotation between the stator and the rotor, there are certain difficulties in actually performing temperature testing. For example, a temperature sensor is set outside the coil of the stator. When the stator and the rotor move relative to each other, it is easy to cause damage to the temperature sensor, and there is a risk of tangled wires, resulting in failure of temperature acquisition. This embodiment takes the above problems into consideration well, and utilizes the structural characteristics of the thermocouple sensor (that is, the thermocouple sensor is connected by two wires of different metals (or alloys), and the joint of the two wires is the measurement point. The thermoelectric effect is generated at the measurement point to measure temperature changes), and the first thermocouple sensor is set inside the coil of the stator core, so as to realize the internal temperature acquisition of the stator (stator core) while avoiding damage to the first thermocouple sensor, effectively reducing the risk of tangled wires.

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

[0056] It should be mentioned that the number of the first thermocouple sensor and the number of the second thermocouple sensor are both multiple to meet the demand of obtaining the stator temperature field.

[0057] S120: Obtain fitting data of the stator temperature field based on the first temperature value and the second temperature value.

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

[0059] It should be noted that by performing linear fitting of the temperature field data based on the first temperature value and the second temperature value, fitting data of the stator temperature field with higher accuracy can be obtained. In addition, through the above method, real-time monitoring of the temperature at different positions of the stator can be achieved, thereby facilitating a more accurate evaluation of the temperature rise characteristics and heat dissipation effect of the motor stator.

[0060] S130: Based on the fitting data, identifying abnormal temperature points and predicting future changes in the temperature field.

[0061] It should be noted that by identifying abnormal temperature points and predicting future changes in the temperature field based on the fitting data, the accuracy of the abnormal temperature point identification results and the temperature field future change prediction results can be better guaranteed. In addition, by identifying abnormal temperature points and predicting future changes in the temperature field, it is convenient for users to understand and grasp the situation of the stator temperature field, with low cost and high flexibility.

[0062] In some embodiments, a measuring end of the first thermocouple sensor is buried in a stator groove of the stator core, the coil covers the first thermocouple sensor, and a 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 is provided with a plurality of stator grooves, and coils are embedded in the stator grooves. In the above embodiment, the measuring end of the first thermocouple sensor is buried in the stator groove, the lead end of the first thermocouple sensor is connected to the temperature acquisition device, and after the first thermocouple sensor is buried, the coil is embedded in the stator groove, that is, the coil is covered with the first thermocouple sensor harness, thereby realizing the real-time acquisition of the temperature inside the stator (stator core), that is, the real-time acquisition of the first temperature value. The above method can effectively avoid the risk of tangled wires when the stator rotates, and significantly improves the space utilization of the stator.

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

[0065] It should be noted that by adopting the above method, setting the second thermocouple sensor in the groove of the stator core can facilitate the collection of the peripheral temperature of the stator core and the collection 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 sensors are arranged in such a manner that at least one of the first thermocouple sensors is disposed every other phase sequence inside the coil of the stator core.

[0067] It should be noted that the coils of the stator core include three phase sequences of U, V, and W, and the coils are distributed inside the stator core, that is, inside the stator grooves, according to the three phase sequences of U, V, and W. By arranging at least one of the first thermocouple sensors every other phase sequence inside the coils of the stator core, it is possible to reduce the layout cost and improve the efficiency of sensor layout while meeting the temperature collection requirements inside the stator core.

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

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

[0070] It should be mentioned that by arranging the first thermocouple sensors at different positions inside the stator core, it is possible to easily capture the slight changes in the temperature of the coil (winding) of the stator core.

[0071] In some embodiments, the second thermocouple sensors are arranged in such a manner that a plurality of the second thermocouple sensors are evenly disposed on the periphery of the stator core according to a preset distribution interval, and the distribution interval is an interval of one or more of the grooves.

[0072] It should be noted that the distribution interval can be set according to actual conditions, such as 5 grooves or 6 grooves. By evenly arranging multiple second thermocouple sensors on the periphery of the stator core, the external temperature of the stator core can be better collected. It should be mentioned that by arranging the second thermocouple sensors at different positions on the periphery of the stator core, it is easy to capture the subtle changes in the temperature of the stator core periphery.

[0073] In some embodiments, it also includes: under preset test conditions, obtaining a third temperature value of the U-phase copper plate of the stator core, a fourth temperature value of the V-phase copper plate, and a 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 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.

[0074] It should be noted that, in addition to the first temperature value and the second temperature value, the above embodiment also obtains 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, which can further ensure the comprehensiveness of the stator temperature field data. Compared with only obtaining the first temperature value and the second temperature value, or only 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, the above method can better ensure the comprehensiveness of the acquired data.

[0075] Specifically, a third thermocouple sensor is arranged on the three-phase copper plate to obtain 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. The third thermocouple sensor is arranged on the three-phase copper plate as follows: a third thermocouple sensor is arranged on each of the U-phase copper plate, the V-phase copper plate, and the W-phase copper plate. The lead-out end of the third thermocouple sensor is 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 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, the balance of the three-phase current can be evaluated, which helps to find potential problems in the operation of the motor, such as imbalance in the three-phase current.

[0077] Furthermore, based on the first temperature value and the second temperature value, the step of obtaining fitting data of the stator temperature field 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 fitting data of the stator temperature field.

[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, which has high accuracy and 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 fitting data of the stator temperature field.

[0080] In some embodiments, regarding the arrangement of sensors, a temperature sensor (the temperature sensor may be a thermocouple sensor, etc.) may be arranged around the oil pan of the motor, that is, the motor housing, to collect the spatially distributed temperature of the oil pan and ensure the temperature uniformity of the oil pan. In addition, by acquiring the temperature data around the oil pan, it is possible to facilitate the subsequent analysis of 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 is an explanation of the stator layout (arrangement of thermocouple sensors) steps in the above embodiment using a specific embodiment.

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

[0083] Secondly, prepare the tools, including: spot welder, thermocouple sensor, heat shrink tubing, AB glue, wire rope, and other tools.

[0084] Then, carry out point layout, that is, arrange the thermocouple sensors.

[0085] Specifically, regarding the internal layout of the stator core: assuming that the stator core includes 48 stator grooves, every two stator grooves correspond to a coil phase sequence, such as the coil phase sequence in the second and third stator grooves is U phase, the coil phase sequence in the fourth and fifth stator grooves is V phase, the coil phase sequence in the sixth and seventh stator grooves is W phase, and the coil phase sequence in the eighth and ninth stator grooves is U phase and so on. Then, the arrangement of the first thermocouple sensor is completed by arranging two stator grooves every two stator grooves. Arranging two stator grooves means burying a first thermocouple sensor in each of the two stator grooves. The specific arrangement is as follows:

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

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

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

[0089] The above “2 / 3” indicates the second and third stator grooves, and the remaining numbers are similar.

[0090] Regarding the arrangement of points on the periphery (grooves) of the stator core: a second thermocouple sensor is arranged every 6 grooves. In this embodiment, 6 second thermocouple sensors are arranged on the periphery of the stator core by way of example.

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

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

[0093] The following table 1 shows the internal layout comparison table of the stator core:

[0094] Table 1 Comparison table of internal distribution points of stator core

[0095]

[0096] The channels in Table 1 above refer to sensor channels, such as each thermocouple sensor corresponds to a channel. The slot numbers refer to the numbers of the corresponding stator slots.

[0097] Table 2 below shows a comparison table of three-phase copper plaque distribution and groove distribution:

[0098] Table 2 Comparison table of three-phase copper plate distribution and groove distribution

[0099] aisle 25 26 27 28 29 30 31 32 33 Copper plate phase sequence / groove number U phase V Phase W phase 1 8 15 22 29 36

[0100] After completing the above-mentioned layout, high-temperature assembly is carried out, that is, the motor casing is placed in a high-temperature box for heating (such as heating at 180°C for 4 hours), and then the stator is installed inside the casing, and the assembly is completed according to the installation process. It should be noted that a through hole (its size is such as 20mm (millimeter), etc.) is opened at the rear of the casing to lead out the sensor harness. By executing the above-mentioned layout method, the temperature of the inside, outside, and three-phase copper plate of the stator core can be better captured, which is convenient for subsequent temperature field data analysis. In addition, the temperature of the oil pan can also be captured, which is convenient for obtaining the spatial temperature distribution of the oil pan, thereby optimizing the cooling system and improving the overall heat dissipation effect.

[0101] Figure 2 This is a schematic diagram of the structure of the stator provided in one embodiment of the present invention, please refer to Figure 2 The stator includes a stator core 210 and a coil 220, and the coil 220 is arranged in a stator groove 2101 of the stator core 210. The coil includes a U, V, W three-phase copper plate 2201.

[0102] Figure 3 For a schematic diagram of the structure of a stator for arranging thermocouple sensors provided in 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 arranged at intervals of one phase sequence, such as a first thermocouple sensor is arranged in the stator groove corresponding to U, and then the stator groove corresponding to V is skipped, and a first thermocouple sensor is arranged in the stator groove of the W phase, and so on. A plurality of second thermocouple sensors 320 (thermocouple sensor harness) are evenly arranged in the grooves 2202 on the periphery of the stator core. A third thermocouple sensor 330 (thermocouple sensor harness) is arranged in each of the three-phase copper plates 2201.

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

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

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

[0106] 3. Determine the difference between the mean value and the middle value as the first value, and determine the sum of the mean value and the middle value as the second value.

[0107] 4. Based on the first value and the second value, obtain a target threshold range;.

[0108] 5. Determine the temperature points in the fitting data that exceed the target threshold range as abnormal temperature points.

[0109] It should be noted that, through the above steps, the abnormal temperature point can be well determined with high accuracy.

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

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

[0112] It should be noted that an ARIMA (Autoregressive Integrated Moving Average) model may be used to perform time series prediction on the fitting data to obtain a plurality of predicted temperature values ​​of the motor stator temperature field.

[0113] In order to achieve further analysis of the stator temperature field, the motor stator temperature field testing and analysis method further includes: based on the fitting data, identifying temperature fluctuations and evaluating stator cooling conditions.

[0114] In some embodiments, based on the fitting data, the step of identifying the temperature fluctuation condition comprises:

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

[0116] 2. Based on the temperature fluctuation parameters, the temperature fluctuation situation is identified.

[0117] It should be noted that, through the above steps, the temperature fluctuation of the stator temperature field can be better identified.

[0118] In some embodiments, based on the fitting data, the step of evaluating the stator cooling condition comprises:

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

[0120] 2. Based on the fitting data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the stator cooling condition evaluation.

[0121] It should be noted that the corresponding cooling conditions can be scored manually, or corresponding scoring indicators (such as volatility, etc.) can be set to score the corresponding cooling conditions. It should be mentioned that through the above steps, the evaluation of the stator cooling conditions can be achieved well.

[0122] In order to make the test results of the motor stator temperature field closer to reality, the present invention proposes two test conditions, namely a steady-state temperature rise test condition and a transient temperature rise test condition. The two test conditions are explained below in the form of embodiments.

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

[0124] The test conditions include: cooling conditions (coolant temperature and coolant flow of the stator cooling system), test voltage, working mode, and the amount of oil added by the external oil pump. The test voltage refers to the voltage provided to the motor. The working mode includes electric mode and power generation mode. The external oil pump refers to the oil pump that provides circulating cooling power for 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 end 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 ​​of a target number of temperature values ​​collected continuously.

[0125] It should be noted that the first acquisition frequency may be 30 seconds / time, etc., and the first temperature threshold and the second temperature threshold may be set according to actual conditions, such as the first temperature threshold is 2K (Kelvin), the second temperature threshold is 120°C, etc.

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

[0127] Coolant temperature: 20±2℃; Coolant flow rate: 12±0.5L / min (liters / minute); Test voltage: rated voltage (650V); Working mode: electric mode; Refueling volume: 1.8L (liters).

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

[0129] Similarly, the coolant temperature can also be changed, such as changing the coolant temperature from 20±2°C to 75±2°C, and re-executing the test steps of the above-mentioned steady-state temperature rise test condition 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 embodiment can help identify the stability of the motor stator temperature under steady-state conditions by acquiring and recording the temperature changes over a long period of time (such as recording the first temperature value and the second temperature value every 30 seconds, etc.). Based on the data acquired under the steady-state temperature rise test condition, potential temperature fluctuations and abnormal conditions can be identified.

[0131] In some embodiments, the transient temperature rise test condition refers to increasing the speed of the motor from 0 to a target speed value according to a preset rise time under preset test conditions, and controlling the motor to run at the target speed value for a preset time. 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 regularly 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 overtemperature 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 to increase the motor speed from 0 to the target speed value, and the rise time can be set according to actual test requirements, such as 20s, 30s, 40s, etc. The target speed value is 18000rpm, etc., and the preset time is 3s, etc. The speed drop time corresponds to the rise time. The peak power is 200kW, etc., and the second acquisition frequency is 0.01 seconds / time, etc.

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

[0134] Coolant temperature: 20±2℃; Coolant flow rate: 12±0.5L / min (liters / minute); Test voltage: rated voltage (650V); Working mode: electric mode; Refueling volume: 1.8L (liters).

[0135] Then, the test steps of the transient temperature rise test condition include: setting the peak torque (such as 400Nm (Newton meters), etc.), coolant temperature (20±2°C), and coolant flow (12±0.5L / min). Assuming that the current set rise time is 20s, the motor speed is increased from 0 to the target speed value within 20s (the exemplary value of the target speed value here is 18000rpm). In addition, the motor is controlled to run at the target speed value for a preset time (the exemplary value of the preset time here is 3s). The motor speed drop time is the same as the rise time, which is also 20s, that is, the motor speed is controlled to drop from 18000rpm to 0 within 20s. During this process, when the torque output by the motor is the peak torque or the power of the motor reaches a preset peak power (such as 200kW, etc.), the target parameters are regularly collected according to a preset second collection frequency (such as 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 (such as 30s, etc.), or an over-temperature fault is detected (MCU (Microcontroller Unit) issues an over-temperature fault warning)).

[0136] Similarly, by changing the rise time, such as changing 20s to 40s, 60s, etc., and repeating the above test steps, the target parameters of the motor under different speed increases can be obtained, so as to fully understand the situation of the motor under different working conditions. In addition, the coolant temperature can also 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, it is possible to capture in real time the subtle fluctuations in the transient temperature field of the motor under rapidly changing speed conditions, thereby providing more detailed temperature data (first temperature value and 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 conditions of the motor can be reflected under all conditions and in all ranges, which is convenient for comprehensive thermal 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, when 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 the operation of the motor in real time, so as to take timely overheating prevention measures.

[0140] It should be mentioned that the first temperature value and the second temperature value obtained based on the above test can facilitate the observation of the temperature change rate and temperature stability of the stator core. Moreover, based on the preset temperature sensor of the motor body, the change of the temperature value of the motor body can be monitored. Furthermore, by setting different cooling conditions, the influence of different cooling conditions on the steady-state temperature rise and transient temperature rise of the stator coil can be obtained.

[0141] The following describes the possible faults that may occur during the test and how to deal with them:

[0142] Resolver failure: If a resolver failure (GPO) occurs, check whether the internal wiring harness is broken, that is, 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 magnetic rings and magic stickers.

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

[0145] The external oil pump does not work: Check whether the wiring harness and terminal connections of the external oil pump are normal.

[0146] Abnormal sensor temperature reading: If the sensor temperature reading is abnormal (Overload), check whether the sensor spot welding part is normal and confirm the wiring harness resistance.

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

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

[0149] The motor stator temperature field testing and analysis device provided by the present invention is described below. The motor stator temperature field testing and analysis device described below and the motor stator temperature field testing and analysis method described above can be referenced to each other.

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

[0151] The temperature value acquisition module 410 is used to acquire a plurality of first temperature values ​​and second temperature values ​​under a preset test condition, wherein the first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor, wherein the first thermocouple sensor is disposed inside a coil of a stator core of the motor, and the second thermocouple sensor is disposed in a groove of the stator core, and the grooves are distributed around the periphery of the stator core;

[0152] A fitting module 420, configured to obtain fitting data of a 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 fitting 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 can better realize the actual measurement of the internal temperature and the peripheral temperature of the stator (stator core), with high accuracy, which helps to improve the accuracy of subsequent data analysis. And by analyzing the motor stator temperature field based on the fitting data, that is, identifying abnormal temperature points and predicting future changes in the temperature field, it is possible to achieve diversified utilization of the fitting 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 also used to obtain 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 under preset test conditions. 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.

[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 fitting data;

[0157] Determine the product of the standard deviation and the preset target multiple as the intermediate value;

[0158] Determine a difference between the mean and the middle value as a first value, and determine a sum of the mean and the middle value as a second value;

[0159] Based on the first value and the second value, obtaining a target threshold range;

[0160] A temperature point in the fitting data that exceeds the target threshold range is determined as an abnormal temperature point.

[0161] In some embodiments, the analysis module 430 is further specifically used to perform time series prediction based on the fitting data to obtain multiple predicted temperature values ​​of the motor stator temperature field 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 fitting data of the stator temperature field, and the temperature fluctuation parameters include: variance, standard deviation, extreme value and range of multiple temperature points of the fitting data, and the range refers to the difference between the maximum value and the minimum value of the temperature point in the fitting data;

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

[0164] In some embodiments, the analysis module 430 is further specifically used to obtain fitting data of the stator temperature field under different cooling conditions, where 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 fitting data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the stator cooling condition evaluation.

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

[0167] 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 arranged inside the coil of the stator core, the second thermocouple sensor 320 is arranged in the groove of the stator core, the first thermocouple sensor 310 and the second thermocouple sensor 320 are both connected to the input end of the temperature acquisition device 510, and the output end 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 better implement the temperature field test of the motor stator with high accuracy, and can better implement the temperature field analysis 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 is shown in FIG. Figure 6 As shown. The electronic device includes a processor, a memory, a network interface and a database connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile and / or volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external client via a network connection. When the computer program is executed by the processor, the functions or steps on the server side of the above method are implemented.

[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, wherein the processor implements the following steps when executing the computer program: under preset test conditions, a plurality of first temperature values ​​and second temperature values ​​are acquired, the first temperature value is acquired by a first thermocouple sensor, the second temperature value is acquired by a second thermocouple sensor, the first thermocouple sensor is disposed inside a coil of a stator core of a motor, the second thermocouple sensor is disposed in a groove of the stator core, and the grooves are distributed around the stator core; based on the first temperature value and the second temperature value, fitting data of the stator temperature field are obtained; based on the fitting data, abnormal temperature points are identified and future changes in the temperature field are predicted.

[0171] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: under preset test conditions, a plurality of first temperature values ​​and second temperature values ​​are obtained, 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 arranged inside a coil of a stator core of the motor, and the second thermocouple sensor is arranged in a groove of the stator core, and the grooves are distributed around the stator core; based on the first temperature value and the second temperature value, fitting data of the stator temperature field are obtained; based on the fitting data, abnormal temperature points are identified and future changes in the temperature field are predicted.

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

[0173] The flow chart and block diagram in the accompanying drawings illustrate the possible implementation architecture, function and operation of the method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with 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 present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for testing and analyzing the temperature field of a motor stator, characterized in that: include: Under a preset test condition, a plurality of first temperature values ​​and second temperature values ​​are obtained, wherein the first temperature value is collected by a first thermocouple sensor, and the second temperature value is collected by a second thermocouple sensor, wherein the first thermocouple sensor is arranged inside a coil of a stator core of the motor, and the second thermocouple sensor is arranged in a groove of the stator core, and the grooves are distributed around the periphery of the stator core; Based on the first temperature value and the second temperature value, obtaining fitting data of the stator temperature field; Based on the fitting data, abnormal temperature points are identified and future changes in the temperature field are predicted.

2. The motor stator temperature field testing and analysis method according to claim 1 is characterized in that: The measuring end of the first thermocouple sensor is buried 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; The measuring end of the second thermocouple sensor is arranged in the groove of the stator core, and the lead-out end of the second thermocouple sensor is connected to the temperature acquisition device; the first temperature value and the second temperature value are both acquired by using the temperature acquisition device.

3. The motor stator temperature field testing and analysis method according to claim 1 or 2, characterized in that: The first thermocouple sensor is arranged in such a manner that at least one first thermocouple sensor is arranged every phase sequence inside the coil of the stator core; The second thermocouple sensors are arranged in such a manner that a plurality of the second thermocouple sensors are evenly arranged on the periphery of the stator core according to a preset distribution interval, and the distribution interval is an interval of one or more of the grooves.

4. The motor stator temperature field testing and analysis method according to claim 1 or 2, characterized in that: Also includes: Under the 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 are obtained, 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; The step of obtaining fitting data of the stator temperature field 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 fitting data of the stator temperature field.

5. The motor stator temperature field testing and analysis method according to claim 1, characterized in that: Based on the fitting data, the step of identifying abnormal temperature points includes: Obtaining the mean and standard deviation of multiple temperature points in the fitting data; Determine the product of the standard deviation and the preset target multiple as the intermediate value; Determine a difference between the mean and the middle value as a first value, and determine a sum of the mean and the middle value as a second value; Based on the first value and the second value, obtaining a target threshold range; Determining a temperature point in the fitting data that exceeds the target threshold range as an abnormal temperature point; Based on the fitting data, the steps of predicting the future change of the temperature field include: Based on the fitting data, time series prediction is performed to obtain multiple predicted temperature values ​​of the motor stator temperature field to complete the prediction of future changes in the temperature field.

6. The motor stator temperature field testing and analysis method according to claim 1 or 5, characterized in that: Also includes: Based on the fitting data, identifying temperature fluctuations and evaluating stator cooling conditions; Based on the fitting data, the step of identifying the temperature fluctuation condition comprises: Based on the fitting data of the stator temperature field, a temperature fluctuation parameter is obtained, wherein the temperature fluctuation parameter includes: a variance, a standard deviation, an extreme value and a range of a plurality of temperature points of the fitting data, wherein the range refers to a difference between a maximum value and a minimum value of a temperature point in the fitting data; Based on the temperature fluctuation parameters, completing temperature fluctuation situation identification; Based on the fitting data, the step of evaluating the stator cooling condition comprises: Acquire fitting data of the stator temperature field under different cooling conditions, where the cooling conditions are preset conditions, and the cooling conditions include: the coolant temperature and coolant flow rate of the stator cooling system; Based on the fitting data of the stator temperature field under each test condition, the corresponding cooling conditions are scored to complete the stator cooling condition evaluation.

7. The motor stator temperature field testing and analysis method 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 increase steadily under preset test conditions, and when the motor outputs a stable rated torque, regularly collecting target parameters according to a preset first collection frequency until a preset first end condition is met; The test conditions include: cooling conditions, test voltage, working mode, and the amount of oil filled by the external oil pump. The test voltage refers to the voltage provided to the motor. The working mode includes the electric mode and the power generation mode. The external oil pump refers to the oil pump that provides circulating cooling power for 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, a motor voltage, a motor current, a motor torque, and a motor speed. The first end 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 ​​of a target number of temperature values ​​collected continuously.

8. The motor stator temperature field testing and analysis method 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 increasing the speed of the motor from 0 to a target speed value according to a preset rise time under preset test conditions, and controlling the motor to run at the target speed value for a preset time. 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 regularly 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 motor stator temperature field testing and analysis device, characterized in that: include: A temperature value acquisition module, used to acquire a plurality of first temperature values ​​and second temperature values ​​under a preset test condition, wherein the first temperature value is acquired by a first thermocouple sensor, and the second temperature value is acquired by a second thermocouple sensor, wherein the first thermocouple sensor is disposed inside a coil of a stator core of the motor, and the second thermocouple sensor is disposed in a groove of the stator core, and the grooves are distributed around the periphery of the stator core; A fitting module, used for obtaining fitting data of a 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 fitting data.

10. A motor stator temperature field testing and analysis system, characterized in that: include: A first thermocouple sensor, a second thermocouple sensor, a temperature acquisition device, and a motor stator temperature field testing and analysis device as claimed in claim 9; The first thermocouple sensor is arranged inside the coil of the stator core, the second thermocouple sensor is arranged in the groove of the stator core, the first thermocouple sensor and the second thermocouple sensor are both connected to the input end of the temperature acquisition device, and the output end of the temperature acquisition device is connected to the motor stator temperature field testing and analysis device.

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