Motor rotor temperature field test method, system and device, and motor rotor

Abstract

The invention provides a motor rotor temperature field test method, system and device, and a motor rotor, and the method comprises the steps: arranging a temperature sensor in a hollow region in a spline shaft, and obtaining the actual temperature of the hollow region under different working conditions based on the temperature sensor; converting the actual temperature of the hollow area into the test temperature of the motor rotor through a multiple regression equation; the multiple regression equation is obtained by performing temperature simulation calibration on a hollow area in the spline shaft and a motor rotor in advance. The temperature sensor is directly installed in the hollow area in the spline shaft, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and errors caused by indirect measurement or a simulation model are reduced. And the temperature data is processed and analyzed in a mode of combining a simulation result and an actual result, and a multiple regression equation is established, so that the temperature data of the hollow part of the spline shaft can be converted into the actual temperature of the motor rotor, and the accuracy of temperature field analysis is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor testing, and in particular to a method, system and equipment for testing the temperature field of a motor rotor, and a motor rotor. Background Art

[0002] The motor rotor, the rotating part in the motor, is a device used to realize the conversion of electrical energy into mechanical energy. At present, in the field of motor rotor temperature field testing, the existing testing methods mainly adopt simulation testing methods. Although the current simulation testing methods can obtain temperature distribution data, their accuracy and reliability are highly dependent on the accuracy of the simulation model and the setting of boundary conditions, making it difficult to fully reflect the temperature changes under actual working conditions. In addition, in the field of automotive testing, only some manufacturers currently carry out motor rotor temperature field testing, and these manufacturers need the motor rotor to be in a high-speed rotating working state when conducting motor rotor temperature field testing, which makes the testing more difficult. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a motor rotor temperature field testing method, system and equipment, and a motor rotor, which are used to solve the technical problems existing in the prior art when testing motor rotors.

[0004] To achieve the above objectives and other related objectives, the present application provides a method for testing the temperature field of a motor rotor, comprising the following steps:

[0005] A temperature sensor is arranged in the hollow area inside the spline shaft, and the actual temperature of the hollow area under different working conditions is obtained based on the temperature sensor; wherein the spline shaft is used to lock the motor rotor and drive the motor rotor to rotate under the drive of an external mechanical device;

[0006] The actual temperature of the hollow area is converted into the test temperature of the motor rotor through a multiple regression equation; wherein the multiple regression equation is obtained by pre-calibrating the temperature of the hollow area inside the spline shaft and the motor rotor through temperature simulation.

[0007] In one embodiment of the present application, the process of performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor to obtain a multivariate regression equation includes:

[0008] When the motor corresponding to the motor rotor is at the first speed and the third load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+d;

[0009] Alternatively, when the motor corresponding to the motor rotor is at a first speed and a first load, a multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d;

[0010] Alternatively, when the motor corresponding to the motor rotor is at the third speed and the first load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+c*Load+d;

[0011] Alternatively, when the motor corresponding to the motor rotor is at the second speed and the second load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d;

[0012] In the above formula, Trotor represents the motor rotor temperature, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, a, b, c, d represent the influence coefficients, which are constant values;

[0013] The first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load.

[0014] In one embodiment of the present application, after converting the actual temperature of the hollow area into the test temperature of the motor rotor through a multivariate regression equation, the method further includes:

[0015] Obtaining the actual temperature of the motor rotor;

[0016] Calculating the difference between the actual temperature of the motor rotor and the test temperature of the motor rotor; and,

[0017] When the difference is not within the preset temperature range, the temperature simulation calibration is performed again to generate a multiple regression equation, and the regenerated multiple regression equation is used to replace the original multiple regression equation; or, the original multiple regression equation is adjusted, and the adjusted multiple regression equation is used to replace the original multiple regression equation.

[0018] In one embodiment of the present application, the process of disposing the temperature sensor in the hollow area inside the spline shaft includes:

[0019] The temperature sensor is fixedly arranged in a contact manner in a hollow area inside the spline shaft so that the temperature sensor is in contact with the spline shaft;

[0020] Alternatively, the temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a non-contact manner so that the temperature sensor does not contact the spline shaft.

[0021] In one embodiment of the present application, a temperature sensor is arranged in front of a hollow area inside the spline shaft, and the method further includes: setting the hollow area inside the spline shaft to a target shape, and the target shape includes at least one of the following: semicircle, triangle, circle, cross, ellipse, polygon.

[0022] In one embodiment of the present application, when the temperature sensor is fixedly disposed in a non-contact manner in a hollow area inside the spline shaft, the method further includes:

[0023] Installing the temperature sensor on a wiring harness and protecting the wiring harness with a sleeve or a shielding layer; and,

[0024] The wiring harness is extended to the hollow area inside the spline shaft, and the wiring harness is fixed by mechanical devices at both ends outside the spline shaft; wherein the temperature sensor is installed on the wiring harness in a single-wire multi-cluster and / or multi-wire multi-cluster manner.

[0025] The present application also provides a motor rotor temperature field testing system, the system comprising:

[0026] A temperature acquisition module, used to obtain the actual temperature of the hollow area inside the spline shaft under different working conditions through a temperature sensor; wherein the temperature sensor is arranged in the hollow area inside the spline shaft, and the spline shaft is used to lock the motor rotor and drive the motor rotor to rotate under the drive of an external mechanical device;

[0027] A simulation module, used for obtaining a multivariate regression equation by performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor;

[0028] The test module is used to convert the actual temperature of the hollow area into the test temperature of the motor rotor through the multivariate regression equation.

[0029] In one embodiment of the present application, the temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a contact manner, and the temperature sensor is in contact with the spline shaft; or, the temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a non-contact manner, and the temperature sensor is not in contact with the spline shaft;

[0030] The process of the simulation module performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor to obtain a multivariate regression equation includes:

[0031] When the motor corresponding to the motor rotor is at the first speed and the third load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+d;

[0032] Alternatively, when the motor corresponding to the motor rotor is at a first speed and a first load, a multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d;

[0033] Alternatively, when the motor corresponding to the motor rotor is at the third speed and the first load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+c*Load+d;

[0034] Alternatively, when the motor corresponding to the motor rotor is at the second speed and the second load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d;

[0035] In the above formula, Trotor represents the motor rotor temperature, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, a, b, c, d represent the influence coefficients, which are constant values;

[0036] The first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load.

[0037] The present application also provides a motor rotor temperature field testing device, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the motor rotor temperature field testing methods described above.

[0038] The present application also provides a motor rotor, the motor rotor is applied to the motor rotor temperature field testing method as described in any one of the above; or the motor rotor is applied to the motor rotor temperature field testing system as described in the above;

[0039] Wherein, the motor rotor is locked by a spline shaft and rotates driven by the spline shaft, and the spline shaft has a hollow area.

[0040] As described above, the present application provides a motor rotor temperature field test method, system and equipment, and a motor rotor, which have the following beneficial effects: the present application directly installs the temperature sensor in the hollow area inside the spline shaft, and can consider the temperature gradient of the motor rotor to arrange the temperature sensor, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and also reduces the error caused by indirect measurement or simulation model. In addition, the present application processes and analyzes the temperature data by combining the simulation results and the actual results, and establishes a multivariate regression equation, which can convert the temperature data of the hollow part of the spline shaft into the actual temperature of the motor rotor through the multivariate regression equation, thereby improving the accuracy of the temperature field analysis. In addition, the present application introduces the temperature sensor and its wiring harness into the spline shaft by designing a hollow spline shaft, which not only meets the demand for temperature measurement, but also retains the bearing strength of the spline shaft through the incomplete hollow design, and improves the bending and torsion resistance of the spline shaft. At the same time, when the wiring harness is introduced into the spline shaft, the wiring harness is protected by using a high wear-resistant sleeve or a shielding layer, which can prevent the wiring harness from being damaged due to the high-speed rotation of the motor rotor, thereby improving the reliability and durability of the wiring harness. Therefore, the present application is not only applicable to small motors, but also to large motors and high-load motors; and by adjusting the hollow form and material selection of the spline shaft, it can meet the testing requirements under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a flow chart of a method for testing a motor rotor temperature field provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the position of a temperature sensor provided in an embodiment of the present application in a hollow area inside a spline shaft;

[0043] Figure 3 A schematic diagram of a temperature sensor fixedly arranged in contact with one embodiment of the present application;

[0044] Figure 4 A schematic diagram of a non-contact fixed temperature sensor provided in an embodiment of the present application;

[0045] Figure 5 A schematic cross-sectional view of a spline shaft provided in one embodiment of the present application;

[0046] Figure 6 A schematic cross-sectional view of a spline shaft provided in another embodiment of the present application;

[0047] Figure 7 A schematic cross-sectional view of a spline shaft provided in yet another embodiment of the present application;

[0048] Figure 8A schematic cross-sectional view of a spline shaft provided in another embodiment of the present application;

[0049] Fig. 9 A schematic cross-sectional view of a spline shaft provided in yet another embodiment of the present application;

[0050] Fig.10 A schematic diagram of the hardware structure of a motor rotor temperature field testing system provided in an embodiment of the present application;

[0051] Fig.11 A schematic diagram of the relationship between a motor rotor and a spline shaft provided in an embodiment of the present application;

[0052] Fig.12 The present invention is a schematic diagram of the hardware structure of a motor rotor temperature field testing device suitable for implementing one or more embodiments of the present application. DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application 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 application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0054] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and the figures only show the components related to the present application rather than being drawn according to the number, shape and size of the 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.

[0055] Figure 1 FIG. 1 is a flow chart of a method for testing the temperature field of a motor rotor provided by an embodiment of the present application. Specifically, in an exemplary embodiment, Figure 1 As shown, this embodiment provides a method for testing the temperature field of a motor rotor, the method comprising the following steps:

[0056] S110, a temperature sensor is set in the hollow area inside the spline shaft, and the actual temperature of the hollow area under different working conditions is obtained based on the temperature sensor; wherein, the spline shaft is used to lock the motor rotor, and drive the motor rotor to rotate under the drive of an external mechanical device. As an example, in this embodiment or other embodiments, the type of temperature sensor can be selected according to the actual test environment, and this embodiment is no longer limited here. In this embodiment or other embodiments, different working conditions can be determined by the speed and load of the motor corresponding to the motor rotor, that is, the different working conditions of the motor rotor are determined by the motor speed and the motor load. In this embodiment or other embodiments, before using the temperature sensor to obtain temperature data, the temperature sensor can also be calibrated to ensure that the accuracy and sensitivity of the sensor meet the experimental requirements. For example, the output of the sensor can be calibrated and adjusted by comparing the sensor reading at a known temperature with the standard temperature value. As an example, the position diagram of the temperature sensor in the hollow area inside the spline shaft is shown in the figure. Figure 2 As shown, in Figure 2 In the figure, 101 represents the hollow area of ​​the spline shaft, 11 represents the temperature sensor, and 12 represents the wiring harness. Figure 2 As shown, the temperature sensor can be introduced into the hollow area inside the spline shaft by using the wiring harness, and the temperature sensor can be arranged considering the temperature gradient of the motor rotor. Then, the temperature value of the hollow area inside the spline shaft is detected by the temperature sensor, and the temperature field of the motor rotor can be obtained by data processing and further calculation of the detected temperature value. Since the motor rotor is in a rotating state during operation, the wiring harness can be fixed as necessary, such as at the free ends on both sides of the wiring harness or inside the spline shaft. When the motor rotor rotates at high speed, the wiring harness is easily damaged by centrifugal force or friction. Therefore, when the wiring harness is introduced into the spline shaft, a high-wear-resistant sleeve or shielding layer can be used to protect the wiring harness, and appropriate path design and fixing measures can be used to prevent the wiring harness from contacting or entangled with the rotating parts. At the same time, a reserved hole can be opened on the motor housing to lead out the wiring harness, and a seal can be used to prevent external impurities from entering to avoid affecting the performance of the temperature sensor.

[0057] S120, converting the actual temperature of the hollow area into the test temperature of the motor rotor through a multiple regression equation; wherein the multiple regression equation is obtained by pre-calibrating the temperature of the hollow area inside the spline shaft and the motor rotor through temperature simulation.

[0058] It can be seen that, in this embodiment, the temperature sensor is directly installed in the hollow area inside the spline shaft, and the temperature gradient of the motor rotor can be considered to arrange the temperature sensor, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and the error caused by indirect measurement or simulation model is reduced. In addition, in this embodiment, the temperature data is processed and analyzed by combining the simulation results with the actual results, and a multivariate regression equation is established, which can convert the temperature data of the hollow part of the spline shaft into the actual temperature of the motor rotor, thereby improving the accuracy of the temperature field analysis.

[0059] In an exemplary embodiment, since there is a certain gap between the temperature of the hollow area inside the spline shaft and the actual temperature of the motor rotor under the theoretical state, the temperature of the hollow area inside the spline shaft and the actual temperature of the motor rotor can be simulated and calibrated by simulation, numerical simulation, searching for the preset value before the test, and the conversion relationship between the two can be obtained; for example, by establishing a multiple regression equation to characterize the conversion relationship between the temperature of the hollow area inside the spline shaft and the temperature of the motor rotor. Or the error value is estimated based on the result of the comparison between the previous test results and the simulation results. Specifically, the present embodiment can simulate the temperature field distribution of the spline shaft and the motor rotor under different working conditions, usually multiple simulations to cover different operating conditions (such as different speeds, loads, etc.). Then, the temperature data of the hollow part of the spline shaft and the surface of the motor rotor are extracted from the simulation results, and the temperature distribution under each operating condition is recorded respectively. Because the operating conditions are different, the temperature field distribution may also be different, so it is necessary to set different conversion relationships according to the corresponding relationship between the temperature conversion relationship and the operating conditions. And when the motor rotor of the motor rotates too fast, friction and current will make the motor rotor temperature rise faster. Therefore, the relationship between the temperature of the hollow part of the spline shaft and the actual temperature of the motor rotor surface is not only affected by factors such as speed and load, but also related to the heat conduction process inside the motor. Therefore, if only a single conversion formula is used to describe the temperature relationship under all working conditions, it is easy to cause prediction errors, especially when the operating state of the motor changes significantly. For example, for load conditions: the greater the load of the motor, the greater the current. The heat generated by the large current will also increase, which will change the temperature distribution of the motor. For example, for environmental conditions: the cooling method of the motor (such as air cooling or water cooling) and the surrounding ambient temperature will affect the heat conduction and heat dissipation effect of the motor. Therefore, the factors that affect the temperature are not just a single variable (such as time or position), but multiple variables (such as multi-point temperature, different operating conditions, air convection, radiation heat dissipation, etc.).

[0060] Therefore, according to the above records, the process of temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor to obtain the multivariate regression equation in this embodiment may include: when the motor corresponding to the motor rotor is at the first speed and the third load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + b * RPM + d. Specifically, when the motor corresponding to the motor rotor is at the first speed and the third load, the motor generates less heat, the temperature rise rate of the motor rotor is slow, the centrifugal force is strong, and the heat conduction is fast. At this time, the heat conduction efficiency is high and the heat dissipation efficiency is enhanced. As another example, when the motor corresponding to the motor rotor is at the first speed and the first load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Tshaft = a * Tshaft + b * RPM + c * Load + d. Specifically, when the motor corresponding to the motor rotor is at the first speed and the first load, the motor generates significantly more heat and the temperature of the motor rotor rises rapidly. Due to the excessive load, the heat generated by the motor rotor far exceeds the heat dissipation capacity, and at this time the heat conduction efficiency is high and the heat dissipation efficiency is reduced. As another example, when the motor corresponding to the motor rotor is at the third speed and the first load, the multiple regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + c * Load + d. Specifically, when the motor corresponding to the motor rotor is at the third speed and the first load, the heat generated by the motor rotor accumulates rapidly, but due to the low speed, the heat cannot be quickly conducted, and the heat conduction efficiency is low and the heat dissipation efficiency is weakened. As another example, when the motor corresponding to the motor rotor is at the second speed and the second load, the multiple regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + b * RPM + c * load + d. Specifically, when the motor corresponding to the motor rotor is at the second speed and the second load, the temperature change of the motor rotor and the spline shaft is relatively stable, and the temperature difference is relatively constant. At this time, the heat conduction efficiency is medium and the heat dissipation efficiency is medium. In the above formula, Trotor represents the temperature of the motor rotor, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, and a, b, c, and d represent the influence coefficients, which are constant values. Among them, the first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load. In this embodiment or other embodiments, the first speed can also be called a high speed, the second speed can also be called a medium speed, and the third speed can also be called a low speed; the first load can also be called a high load, the second load can also be called a medium load, and the third load can also be called a low load. In this embodiment or other embodiments, when the temperature sensor is in a high speed condition or the temperature is higher than the preset temperature, the temperature sensor may fail or the output data may be abnormal.This may be caused by the temperature sensor exceeding the operating temperature range or being installed loosely. In this case, you can use a high-temperature tolerant temperature sensor, improve the installation method of the temperature sensor, or increase the number of temperature sensors to improve data reliability.

[0061] In an exemplary embodiment, after converting the actual temperature of the hollow area into the test temperature of the motor rotor through the multiple regression equation, the present embodiment may also include: obtaining the actual temperature of the motor rotor; calculating the difference between the actual temperature of the motor rotor and the test temperature of the motor rotor; and, when the difference is not in the preset temperature range, re-performing temperature simulation calibration to generate the multiple regression equation, and replacing the original multiple regression equation with the re-generated multiple regression equation; or, when the difference is not in the preset temperature range, adjusting the original multiple regression equation, and replacing the original multiple regression equation with the adjusted multiple regression equation. It can be seen that, when there is a deviation between the actual measurement result and the simulation result, the present embodiment readjusts the boundary conditions, material properties or other parameters of the simulation calibration, re-performs simulation to generate the multiple regression equation, and replaces the original multiple regression equation with the re-generated multiple regression equation.

[0062] In an exemplary embodiment, the process of setting the temperature sensor in the hollow area inside the spline shaft includes: fixing the temperature sensor in the hollow area inside the spline shaft in a contact manner so that the temperature sensor contacts the spline shaft. Specifically, in this embodiment or other embodiments, when the temperature sensor is fixed in the hollow area inside the spline shaft in a contact manner, since the center temperature of the motor rotor is higher than the temperature of the edge of the motor rotor, it is necessary to pay attention to the measurement of the center temperature of the motor rotor. Figure 3 A schematic diagram of a temperature sensor fixedly arranged in contact is shown, such as Figure 3 As shown, it can be used Figure 3 The method shown places the temperature sensor. Considering the accuracy of the measurement process and the subsequent processing process, and the effectiveness of the result comparison, more temperature sensors can be set in the center area of ​​the spline shaft, and the temperature sensors are evenly distributed. In addition, the present embodiment can also modify the position of the temperature sensor according to the actual test scenario, test cost, etc. For example, for the patch type temperature sensor, although the test result is more accurate than the non-contact temperature sensor, the spline shaft is in a state of constant rotation. If the temperature sensor needs to be connected by a wire harness, this method is not suitable. Therefore, this type of temperature sensor is usually used for temperature testing of small motors with shorter spline shafts. The spline shaft is shorter, which is convenient for pasting patch type temperature sensors.

[0063] As another example, the process of setting the temperature sensor in the hollow area inside the spline shaft may also include: fixing the temperature sensor in the hollow area inside the spline shaft in a non-contact manner so that the temperature sensor does not contact the spline shaft. Specifically, in this embodiment or other embodiments, when the temperature sensor is fixed in the hollow area inside the spline shaft in a non-contact manner, since the temperature sensor is not connected to the inside of the spline shaft, it will not rotate with the spline shaft. Therefore, this type of temperature sensor is more friendly to the installation of the wiring harness, and it is sufficient to ensure that the wiring harness will not interfere with the prototype, rub, or cause other errors. Figure 4 A schematic diagram of a non-contact fixed temperature sensor is shown. Figure 4 As shown, when the temperature sensor is fixedly arranged in a non-contact manner in the hollow area inside the spline shaft, it can include: installing the temperature sensor on the wire harness and protecting the wire harness with a sleeve or a shielding layer; and extending the wire harness to the hollow area inside the spline shaft, and fixing the wire harness with a mechanical device at both ends of the outside of the spline shaft; wherein the temperature sensor is installed on the wire harness in a single-wire multi-cluster and / or multi-wire multi-cluster manner. In this embodiment, the temperature sensor is extended into the interior of the spline shaft by a wire harness, and is fixed at both ends of the outside of the spline shaft by a mechanical device. At the same time, the temperature sensor can be installed in the form of multi-wire multi-cluster, single-wire multi-cluster, etc. This installation method is the most convenient to implement. During use, it is necessary to pay attention to the alignment of the spline shaft and the wire harness, and it is necessary to consider that the wire harness will inevitably produce friction with the surrounding equipment, so a buckle setting can be added to constrain the movement of the wire harness to a certain extent.

[0064] In an exemplary embodiment, the temperature sensor is arranged in front of the hollow area inside the spline shaft. This embodiment may also include: setting the hollow area inside the spline shaft to a target shape, and the target shape includes at least one of the following: semicircle, triangle, circle, cross, ellipse, polygon. As an example, Figure 5 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is semicircular. As another example, Figure 6 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is a triangle. As another example, Figure 7 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is a cross. As another example, Figure 8 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is circular. As another example, Fig. 9 A schematic cross-sectional view of a spline shaft is shown, in which the hollow area inside the spline shaft is in the shape of two symmetrical triangles. Figures 5 to 9In the figure, 101 represents the hollow area of ​​the spline shaft, and 102 represents the spline shaft teeth. Specifically, in this embodiment or other embodiments, considering the sample structure, when the temperature sensor and the corresponding wiring harness are extended into the hollow area of ​​the spline shaft, the spline shaft becomes approximately hollow, so the strength of the spline shaft needs to be further improved. Therefore, according to the actual situation, the hollow area inside the spline shaft can be set to a semicircular, triangular, circular, cross-shaped, elliptical, polygonal or other form in this embodiment. At the same time, the length, width and height of the hollow part of the spline shaft cross section are corrected according to the strength requirements and the selection of the spline shaft material is completed. Therefore, this embodiment retains the key load-bearing parts of the spline shaft by designing the spline shaft to be incompletely hollow, and reduces the strength weakening problem caused by complete hollowing. This design method can not only effectively improve the bending and torsion resistance of the spline shaft, but also enable the spline shaft to maintain stable mechanical properties under high load or high speed. In addition, in this embodiment, a stress temperature sensor can be embedded in the spline shaft to monitor the stress changes of the spline shaft in real time under working conditions. The stress data can be used to adjust the motor's operating parameters, such as speed and load distribution, in real time, thereby avoiding overload damage to the spline shaft under extreme working conditions.

[0065] In summary, the present application provides a method for testing the temperature field of a motor rotor, wherein a temperature sensor is arranged in the hollow area inside the spline shaft, and the actual temperature of the hollow area under different working conditions is obtained based on the temperature sensor; wherein the spline shaft is used to lock the motor rotor, and drives the motor rotor to rotate under the drive of an external mechanical device; the actual temperature of the hollow area is converted into the test temperature of the motor rotor through a multiple regression equation; wherein the multiple regression equation is obtained by pre-simulating and calibrating the temperature of the hollow area inside the spline shaft and the motor rotor. It can be seen that the present method directly installs the temperature sensor in the hollow area inside the spline shaft, and the temperature gradient of the motor rotor can be considered to arrange the temperature sensor, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and the error caused by indirect measurement or simulation model is also reduced. And the present method processes and analyzes the temperature data by combining the simulation results and the actual results, and establishes a multiple regression equation, which can convert the temperature data of the hollow part of the spline shaft into the actual temperature of the motor rotor through the multiple regression equation, thereby improving the accuracy of the temperature field analysis. In addition, this method introduces the temperature sensor and its wiring harness into the spline shaft by designing a hollow spline shaft, which not only meets the temperature measurement requirements, but also retains the bearing strength of the spline shaft through the incomplete hollow design, thereby improving the bending and torsion resistance of the spline shaft. At the same time, when the wiring harness is introduced into the interior of the spline shaft, the wiring harness is protected by using a high-wear-resistant sleeve or a shielding layer, which can prevent the wiring harness from being damaged due to the high-speed rotation of the motor rotor, thereby improving the reliability and durability of the wiring harness. Therefore, this method is not only suitable for small motors, but also for large motors and high-load motors; and by adjusting the hollow form and material selection of the spline shaft, it can meet the test requirements under different working conditions. At the same time, this method has high efficiency, low power consumption, and reliable remote data transmission capabilities, and is suitable for motor data acquisition and monitoring in special industrial environments.

[0066] In another exemplary embodiment of the present application, Fig.10 As shown, this embodiment provides a motor rotor temperature field testing system, including:

[0067] The temperature acquisition module 110 is used to obtain the actual temperature of the hollow area inside the spline shaft under different working conditions through a temperature sensor; wherein the temperature sensor is arranged in the hollow area inside the spline shaft, and the spline shaft is used to lock the motor rotor and drive the motor rotor to rotate under the drive of an external mechanical device;

[0068] A simulation module 120, used to obtain a multivariate regression equation by performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor;

[0069] The test module 130 is used to convert the actual temperature of the hollow area into the test temperature of the motor rotor through a multivariate regression equation.

[0070] In this embodiment or other embodiments, the type of temperature sensor can be selected according to the actual test environment, and this embodiment is no longer limited here. In this embodiment or other embodiments, different operating conditions can be determined by the speed and load of the motor corresponding to the motor rotor, that is, the different operating conditions of the motor rotor are determined by the motor speed and the motor load. In this embodiment or other embodiments, before using the temperature sensor to obtain temperature data, the temperature sensor can also be calibrated to ensure that the accuracy and sensitivity of the sensor meet the experimental requirements. For example, the output of the sensor can be calibrated and adjusted by comparing the sensor reading at a known temperature with the standard temperature value. As an example, a schematic diagram of the position of the temperature sensor in the hollow area inside the spline shaft is shown in FIG. Figure 2 As shown, in Figure 2 In the figure, 101 represents the hollow area of ​​the spline shaft, 11 represents the temperature sensor, and 12 represents the wiring harness. Figure 2 As shown, the temperature sensor can be introduced into the hollow area inside the spline shaft by using the wiring harness, and the temperature sensor can be arranged considering the temperature gradient of the motor rotor. Then, the temperature value of the hollow area inside the spline shaft is detected by the temperature sensor, and the temperature field of the motor rotor can be obtained by data processing and further calculation of the detected temperature value. Since the motor rotor is in a rotating state during operation, the wiring harness can be fixed as necessary, such as at the free ends on both sides of the wiring harness or inside the spline shaft. When the motor rotor rotates at high speed, the wiring harness is easily damaged by centrifugal force or friction. Therefore, when the wiring harness is introduced into the spline shaft, a high-wear-resistant sleeve or shielding layer can be used to protect the wiring harness, and appropriate path design and fixing measures can be used to prevent the wiring harness from contacting or entangled with the rotating parts. At the same time, a reserved hole can be opened on the motor housing to lead out the wiring harness, and a seal can be used to prevent external impurities from entering to avoid affecting the performance of the temperature sensor. It can be seen that, in this embodiment, the temperature sensor is directly installed in the hollow area inside the spline shaft, and the temperature gradient of the motor rotor can be considered to arrange the temperature sensor, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and the error caused by indirect measurement or simulation model is reduced. In addition, in this embodiment, the temperature data is processed and analyzed by combining the simulation results with the actual results, and a multivariate regression equation is established, which can convert the temperature data of the hollow part of the spline shaft into the actual temperature of the motor rotor, thereby improving the accuracy of the temperature field analysis.

[0071] In an exemplary embodiment, since there is a certain gap between the temperature of the hollow area inside the spline shaft and the actual temperature of the motor rotor under the theoretical state, the temperature of the hollow area inside the spline shaft and the actual temperature of the motor rotor can be simulated and calibrated by simulation, numerical simulation, searching for the preset value before the test, and the conversion relationship between the two can be obtained; for example, by establishing a multiple regression equation to characterize the conversion relationship between the temperature of the hollow area inside the spline shaft and the temperature of the motor rotor. Or the error value is estimated based on the result of the comparison between the previous test results and the simulation results. Specifically, the present embodiment can simulate the temperature field distribution of the spline shaft and the motor rotor under different working conditions, usually multiple simulations to cover different operating conditions (such as different speeds, loads, etc.). Then, the temperature data of the hollow part of the spline shaft and the surface of the motor rotor are extracted from the simulation results, and the temperature distribution under each operating condition is recorded respectively. Because the operating conditions are different, the temperature field distribution may also be different, so it is necessary to set different conversion relationships according to the corresponding relationship between the temperature conversion relationship and the operating conditions. And when the motor rotor of the motor rotates too fast, friction and current will make the motor rotor temperature rise faster. Therefore, the relationship between the temperature of the hollow part of the spline shaft and the actual temperature of the motor rotor surface is not only affected by factors such as speed and load, but also related to the heat conduction process inside the motor. Therefore, if only a single conversion formula is used to describe the temperature relationship under all working conditions, it is easy to cause prediction errors, especially when the operating state of the motor changes significantly. For example, for load conditions: the greater the load of the motor, the greater the current. The heat generated by the large current will also increase, which will change the temperature distribution of the motor. For example, for environmental conditions: the cooling method of the motor (such as air cooling or water cooling) and the surrounding ambient temperature will affect the heat conduction and heat dissipation effect of the motor. Therefore, the factors that affect the temperature are not just a single variable (such as time or position), but multiple variables (such as multi-point temperature, different operating conditions, air convection, radiation heat dissipation, etc.).

[0072] Therefore, according to the above records, the process of the simulation module performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor to obtain a multiple regression equation includes: when the motor corresponding to the motor rotor is at the first speed and the third load, the multiple regression equation obtained by temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + b * RPM + d. Specifically, when the motor corresponding to the motor rotor is at the first speed and the third load, the motor generates less heat, the temperature rise rate of the motor rotor is slow, the centrifugal force is strong, and the heat conduction is fast. At this time, the heat conduction efficiency is high and the heat dissipation efficiency is enhanced. As another example, when the motor corresponding to the motor rotor is at the first speed and the first load, the multiple regression equation obtained by temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + b * RPM + c * Load + d. Specifically, when the motor corresponding to the motor rotor is at the first speed and the first load, the motor generates significantly more heat and the temperature of the motor rotor rises rapidly. Due to the excessive load, the heat generated by the motor rotor far exceeds the heat dissipation capacity, and the heat conduction efficiency is high and the heat dissipation efficiency is reduced. As another example, when the motor corresponding to the motor rotor is at the third speed and the first load, the multiple regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + c * Load + d. Specifically, when the motor corresponding to the motor rotor is at the third speed and the first load, the heat generated by the motor rotor accumulates rapidly, but due to the low speed, the heat cannot be quickly conducted, and the heat conduction efficiency is low and the heat dissipation efficiency is weakened. As another example, when the motor corresponding to the motor rotor is at the second speed and the second load, the multiple regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a * Tshaft + b * RPM + c * Load + d. Specifically, when the motor corresponding to the motor rotor is at the second speed and the second load, the temperature change of the motor rotor and the spline shaft is relatively stable, and the temperature difference is relatively constant. At this time, the heat conduction efficiency is medium and the heat dissipation efficiency is medium. In the above formula, Trotor represents the temperature of the motor rotor, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, and a, b, c, and d represent the influence coefficients, which are constant values. Among them, the first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load. In this embodiment or other embodiments, the first speed can also be called a high speed, the second speed can also be called a medium speed, and the third speed can also be called a low speed; the first load can also be called a high load, the second load can also be called a medium load, and the third load can also be called a low load. In this embodiment or other embodiments, when the temperature sensor is in a high speed condition or the temperature is higher than the preset temperature, the temperature sensor may fail or the output data may be abnormal.This may be caused by the temperature sensor exceeding the operating temperature range or being installed loosely. In this case, you can use a high-temperature tolerant temperature sensor, improve the installation method of the temperature sensor, or increase the number of temperature sensors to improve data reliability.

[0073] In an exemplary embodiment, after converting the actual temperature of the hollow area into the test temperature of the motor rotor through the multiple regression equation, the present embodiment may also include: obtaining the actual temperature of the motor rotor; calculating the difference between the actual temperature of the motor rotor and the test temperature of the motor rotor; and, when the difference is not in the preset temperature range, re-performing temperature simulation calibration to generate the multiple regression equation, and replacing the original multiple regression equation with the re-generated multiple regression equation; or, when the difference is not in the preset temperature range, adjusting the original multiple regression equation, and replacing the original multiple regression equation with the adjusted multiple regression equation. It can be seen that, when there is a deviation between the actual measurement result and the simulation result, the present embodiment readjusts the boundary conditions, material properties or other parameters of the simulation calibration, re-performs simulation to generate the multiple regression equation, and replaces the original multiple regression equation with the re-generated multiple regression equation.

[0074] In an exemplary embodiment, the process of setting the temperature sensor in the hollow area inside the spline shaft includes: fixing the temperature sensor in the hollow area inside the spline shaft in a contact manner so that the temperature sensor contacts the spline shaft. Specifically, in this embodiment or other embodiments, when the temperature sensor is fixed in the hollow area inside the spline shaft in a contact manner, since the center temperature of the motor rotor is higher than the temperature of the edge of the motor rotor, it is necessary to pay attention to the measurement of the center temperature of the motor rotor. Figure 3 A schematic diagram of a temperature sensor fixedly arranged in contact is shown, such as Figure 3 As shown, it can be used Figure 3 The method shown places the temperature sensor. Considering the accuracy of the measurement process and the subsequent processing process, and the effectiveness of the result comparison, more temperature sensors can be set in the center area of ​​the spline shaft, and the temperature sensors are evenly distributed. In addition, the present embodiment can also modify the position of the temperature sensor according to the actual test scenario, test cost, etc. For example, for the patch type temperature sensor, although the test result is more accurate than the non-contact temperature sensor, the spline shaft is in a state of constant rotation. If the temperature sensor needs to be connected by a wire harness, this method is not suitable. Therefore, this type of temperature sensor is usually used for temperature testing of small motors with shorter spline shafts. The spline shaft is shorter, which is convenient for pasting patch type temperature sensors.

[0075] As another example, the process of setting the temperature sensor in the hollow area inside the spline shaft may also include: fixing the temperature sensor in the hollow area inside the spline shaft in a non-contact manner so that the temperature sensor does not contact the spline shaft. Specifically, in this embodiment or other embodiments, when the temperature sensor is fixed in the hollow area inside the spline shaft in a non-contact manner, since the temperature sensor is not connected to the inside of the spline shaft, it will not rotate with the spline shaft. Therefore, this type of temperature sensor is more friendly to the installation of the wiring harness, and it is sufficient to ensure that the wiring harness will not interfere with the prototype, rub, or cause other errors. Figure 4 A schematic diagram of a non-contact fixed temperature sensor is shown. Figure 4 As shown, when the temperature sensor is fixedly arranged in a non-contact manner in the hollow area inside the spline shaft, it can include: installing the temperature sensor on the wire harness and protecting the wire harness with a sleeve or a shielding layer; and extending the wire harness to the hollow area inside the spline shaft, and fixing the wire harness with a mechanical device at both ends of the outside of the spline shaft; wherein the temperature sensor is installed on the wire harness in a single-wire multi-cluster and / or multi-wire multi-cluster manner. In this embodiment, the temperature sensor is extended into the interior of the spline shaft by a wire harness, and is fixed at both ends of the outside of the spline shaft by a mechanical device. At the same time, the temperature sensor can be installed in the form of multi-wire multi-cluster, single-wire multi-cluster, etc. This installation method is the most convenient to implement. During use, it is necessary to pay attention to the alignment of the spline shaft and the wire harness, and it is necessary to consider that the wire harness will inevitably produce friction with the surrounding equipment, so a buckle setting can be added to constrain the movement of the wire harness to a certain extent.

[0076] In an exemplary embodiment, the temperature sensor is arranged in front of the hollow area inside the spline shaft. This embodiment may also include: setting the hollow area inside the spline shaft to a target shape, and the target shape includes at least one of the following: semicircle, triangle, circle, cross, ellipse, polygon. As an example, Figure 5 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is semicircular. As another example, Figure 6 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is a triangle. As another example, Figure 7 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is a cross. As another example, Figure 8 A schematic cross-sectional view of a spline shaft is shown, in which the shape of the hollow area inside the spline shaft is circular. As another example, Fig. 9 A schematic cross-sectional view of a spline shaft is shown, in which the hollow area inside the spline shaft is in the shape of two symmetrical triangles. Figures 5 to 9In the figure, 101 represents the hollow area of ​​the spline shaft, and 102 represents the spline shaft teeth. Specifically, in this embodiment or other embodiments, considering the sample structure, when the temperature sensor and the corresponding wiring harness are extended into the hollow area of ​​the spline shaft, the spline shaft becomes approximately hollow, so the strength of the spline shaft needs to be further improved. Therefore, according to the actual situation, the hollow area inside the spline shaft can be set to a semicircular, triangular, circular, cross-shaped, elliptical, polygonal or other form in this embodiment. At the same time, the length, width and height of the hollow part of the spline shaft cross section are corrected according to the strength requirements and the selection of the spline shaft material is completed. Therefore, this embodiment retains the key load-bearing parts of the spline shaft by designing the spline shaft to be incompletely hollow, and reduces the strength weakening problem caused by complete hollowing. This design method can not only effectively improve the bending and torsion resistance of the spline shaft, but also enable the spline shaft to maintain stable mechanical properties under high load or high speed. In addition, in this embodiment, a stress temperature sensor can be embedded in the spline shaft to monitor the stress changes of the spline shaft in real time under working conditions. The stress data can be used to adjust the motor's operating parameters, such as speed and load distribution, in real time, thereby avoiding overload damage to the spline shaft under extreme working conditions.

[0077] In summary, the present application provides a motor rotor temperature field test system, which sets a temperature sensor in the hollow area inside the spline shaft, and obtains the actual temperature of the hollow area under different working conditions based on the temperature sensor; wherein the spline shaft is used to lock the motor rotor, and drives the motor rotor to rotate under the drive of an external mechanical device; the actual temperature of the hollow area is converted into the test temperature of the motor rotor through a multiple regression equation; wherein the multiple regression equation is obtained by pre-simulating and calibrating the temperature of the hollow area inside the spline shaft and the motor rotor. It can be seen that the system directly installs the temperature sensor in the hollow area inside the spline shaft, and the temperature gradient of the motor rotor can be considered to arrange the temperature sensor, so that the temperature measured by the temperature sensor is closer to the actual temperature of the motor rotor, and the error caused by indirect measurement or simulation model is also reduced. And the system processes and analyzes the temperature data by combining the simulation results and the actual results, and establishes a multiple regression equation, which can convert the temperature data of the hollow part of the spline shaft into the actual temperature of the motor rotor through the multiple regression equation, thereby improving the accuracy of the temperature field analysis. In addition, this system introduces the temperature sensor and its wiring harness into the spline shaft by designing a hollow spline shaft, which not only meets the temperature measurement requirements, but also retains the bearing strength of the spline shaft through the incomplete hollow design, and improves the bending and torsion resistance of the spline shaft. At the same time, when the wiring harness is introduced into the spline shaft, the wiring harness is protected by using a high-wear-resistant sleeve or shielding layer to prevent damage to the wiring harness caused by the high-speed rotation of the motor rotor, thereby improving the reliability and durability of the wiring harness. Therefore, this system is not only suitable for small motors, but also for large motors and high-load motors; and by adjusting the hollow form and material selection of the spline shaft, it can meet the test requirements under different working conditions. At the same time, this system has high-efficiency, low-power, and reliable remote data transmission capabilities, and is suitable for motor data acquisition and monitoring in special industrial environments.

[0078] It should be noted that the motor rotor temperature field test system provided in the above embodiment and the motor rotor temperature field test method provided in the above embodiment belong to the same concept, wherein the specific manner in which the motor rotor temperature field test method performs operations has been described in detail in the above method embodiment, and will not be repeated here. In practical applications, the motor rotor temperature field test system provided in the above embodiment can distribute the above functions to different functional modules as needed, that is, divide the internal structure of the motor rotor temperature field test system into different functional modules, and then implement all or part of the functions of the corresponding functional modules through the motor rotor temperature field test method described in the above embodiment, and no specific restrictions are made here.

[0079] In another exemplary embodiment of the present application, the embodiment further provides a motor rotor, which can be applied to any embodiment of the motor rotor temperature field test method as described above; or the motor rotor can be applied to any embodiment of the motor rotor temperature field test system as described above; wherein the motor rotor is locked by a spline shaft and rotates driven by the spline shaft, and the spline shaft has a hollow area. Specifically, the schematic diagram of the relationship between the motor rotor and the spline shaft in this embodiment is as follows Fig.11 As shown. Fig.11 As shown, 10 represents a spline shaft, 20 represents a motor rotor, 30 represents a gap between the motor rotor and the stator, and 40 represents a stator. It should be noted that the specific manner in which the motor rotor temperature field test method and / or the motor rotor temperature field test system performs operations has been described in detail in the above embodiments, so the specific application process of the motor rotor and the spline shaft provided in this embodiment will not be repeated here, and reference can be made to the above embodiments.

[0080] The present application also provides a motor rotor temperature field test device, which may include a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to enable the motor rotor temperature field test device to perform Figure 1 The steps of the motor rotor temperature field testing method. Fig.12 FIG. 1 is a schematic diagram showing a structure of a motor rotor temperature field testing device 1000. Fig.12 As shown, the motor rotor temperature field testing device 1000 includes: a processor 1010 , a memory 1020 , a power supply 1030 , a display unit 1040 , and an input unit 1060 .

[0081] The processor 1010 is the control center of the motor rotor temperature field test device 1000. It uses various interfaces and lines to connect various components, and executes various functions of the motor rotor temperature field test device 1000 by running or executing computer programs / instructions stored in the memory 1020, thereby monitoring the motor rotor temperature field test device 1000 as a whole. In the embodiment of the present application, when the processor 1010 calls the computer program stored in the memory 1020, the following is executed: Figure 1 The steps of the motor rotor temperature field test method. Optionally, the processor 1010 may include one or more processing units; preferably, the processor 1010 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application, etc., and the modem processor mainly processes wireless communication. In some embodiments, the processor and the memory may be implemented on a single chip, and in some embodiments, they may also be implemented separately on separate chips.

[0082] The memory 1020 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, various applications, etc.; the data storage area may store instruction data created according to the use of the motor rotor temperature field test device 1000, etc. In addition, the memory 1020 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices, etc.

[0083] The motor rotor temperature field testing device 1000 also includes a power supply 1030 (such as a battery) for supplying power to various components. The power supply can be logically connected to the processor 1010 through a power management system, thereby managing functions such as charging, discharging, and power consumption through the power management system.

[0084] The display unit 1040 can be used to display information input by the user or information provided to the user and various menus of the motor rotor temperature field test device 1000, etc. In the embodiment of the present application, it is mainly used to display the display interface of each application in the motor rotor temperature field test device 1000 and objects such as text and pictures displayed in the display interface. The display unit 1040 may include a display panel 1050. The display panel 1050 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0085] The input unit 1060 may be used to receive information such as numbers or characters input by the user. The input unit 1060 may include a touch panel 1070 and other input devices 1080. The touch panel 1070, also known as a touch screen, may collect touch operations of the user on or near it (such as operations of the user using a finger, a stylus, or any other suitable object or accessory on or near the touch panel 1070).

[0086] Specifically, the touch panel 1070 can detect the user's touch operation, detect the signal brought by the touch operation, convert these signals into touch point coordinates, send them to the processor 1010, and receive and execute the command sent by the processor 1010. In addition, the touch panel 1070 can be implemented in various types such as resistive, capacitive, infrared and surface acoustic wave. Other input devices 1080 can include but are not limited to one or more of a physical keyboard, function keys (such as volume control keys, power on / off keys, etc.), a trackball, a mouse, a joystick, etc.

[0087] Of course, the touch panel 1070 can cover the display panel 1050. When the touch panel 1070 detects a touch operation on or near it, it is transmitted to the processor 1010 to determine the type of touch event, and then the processor 1010 provides a corresponding visual output on the display panel 1050 according to the type of touch event. Fig.12 In the figure, the touch panel 1070 and the display panel 1050 are two independent components to realize the input and output functions of the motor rotor temperature field testing device 1000, but in some embodiments, the touch panel 1070 and the display panel 1050 can be integrated to realize the input and output functions of the motor rotor temperature field testing device 1000.

[0088] The motor rotor temperature field testing device 1000 may also include one or more sensors, such as a pressure sensor, a gravity acceleration sensor, a proximity light sensor, etc. Of course, according to the needs of specific applications, the motor rotor temperature field testing device 1000 may also include other components such as a camera.

[0089] The embodiment of the present application also provides a computer-readable storage medium, in which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, the above-mentioned device can perform the above-mentioned Figure 1 The steps of the motor rotor temperature field testing method.

[0090] It can be understood by those skilled in the art that Fig.12 This is only an example of a motor rotor temperature field test device and does not constitute a limitation on the device. The device may include more or fewer components than shown in the figure, or combine certain components, or different components. For the convenience of description, the above parts are divided into modules (or units) according to their functions and described separately. Of course, when implementing this application, the functions of each module (or unit) can be implemented in the same or multiple software or hardware.

[0091] Those skilled in the art should understand that the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be applied to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] It should be understood that, although the terms first, second, third, etc. may be used to describe the rotational speed, etc. in the embodiments of the present application, these terms are only used to distinguish the rotational speeds from each other. For example, without departing from the scope of the embodiments of the present application, the first rotational speed may also be referred to as the second rotational speed, and similarly, the second rotational speed may also be referred to as the first rotational speed.

[0093] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for testing the temperature field of a motor rotor, characterized in that: The method comprises the following steps: A temperature sensor is arranged in the hollow area inside the spline shaft, and the actual temperature of the hollow area under different working conditions is obtained based on the temperature sensor; wherein the spline shaft is used to lock the motor rotor and drive the motor rotor to rotate under the drive of an external mechanical device; The actual temperature of the hollow area is converted into the test temperature of the motor rotor through a multiple regression equation; wherein the multiple regression equation is obtained by pre-calibrating the temperature of the hollow area inside the spline shaft and the motor rotor through temperature simulation.

2. The motor rotor temperature field testing method according to claim 1, characterized in that: The process of calibrating the temperature of the hollow area inside the spline shaft and the motor rotor to obtain the multivariate regression equation includes: When the motor corresponding to the motor rotor is at the first speed and the third load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+d; Alternatively, when the motor corresponding to the motor rotor is at a first speed and a first load, a multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d; Alternatively, when the motor corresponding to the motor rotor is at the third speed and the first load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+c*load+d; Alternatively, when the motor corresponding to the motor rotor is at the second speed and the second load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d; In the above formula, Trotor represents the motor rotor temperature, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, a, b, c, d represent the influence coefficients, which are constant values; The first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load.

3. The motor rotor temperature field testing method according to claim 1, characterized in that: After converting the actual temperature of the hollow area into the test temperature of the motor rotor through a multiple regression equation, the method further includes: Obtaining the actual temperature of the motor rotor; Calculating the difference between the actual temperature of the motor rotor and the test temperature of the motor rotor; and, When the difference is not within the preset temperature range, the temperature simulation calibration is performed again to generate a multiple regression equation, and the regenerated multiple regression equation is used to replace the original multiple regression equation; or, the original multiple regression equation is adjusted, and the adjusted multiple regression equation is used to replace the original multiple regression equation.

4. The motor rotor temperature field testing method according to any one of claims 1 to 3, characterized in that: The process of placing the temperature sensor in the hollow area inside the spline shaft includes: The temperature sensor is fixedly arranged in a contact manner in a hollow area inside the spline shaft so that the temperature sensor is in contact with the spline shaft; Alternatively, the temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a non-contact manner so that the temperature sensor does not contact the spline shaft.

5. The motor rotor temperature field testing method according to claim 4, characterized in that: The temperature sensor is arranged in front of the hollow area inside the spline shaft. The method further includes: setting the hollow area inside the spline shaft to a target shape, and the target shape includes at least one of the following: semicircle, triangle, circle, cross, ellipse, polygon.

6. The motor rotor temperature field testing method according to claim 4, characterized in that: When the temperature sensor is fixedly arranged in a non-contact manner in a hollow area inside the spline shaft, the method further comprises: Installing the temperature sensor on a wiring harness and protecting the wiring harness with a sleeve or a shielding layer; and, The wiring harness is extended to the hollow area inside the spline shaft, and the wiring harness is fixed by mechanical devices at both ends outside the spline shaft; wherein the temperature sensor is installed on the wiring harness in a single-wire multi-cluster and / or multi-wire multi-cluster manner.

7. A motor rotor temperature field testing system, characterized in that: The system comprises: A temperature acquisition module, used to obtain the actual temperature of the hollow area inside the spline shaft under different working conditions through a temperature sensor; wherein the temperature sensor is arranged in the hollow area inside the spline shaft, and the spline shaft is used to lock the motor rotor and drive the motor rotor to rotate under the drive of an external mechanical device; A simulation module, used for obtaining a multivariate regression equation by performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor; The test module is used to convert the actual temperature of the hollow area into the test temperature of the motor rotor through the multivariate regression equation.

8. The motor rotor temperature field testing system according to claim 7, characterized in that: The temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a contact manner, and the temperature sensor is in contact with the spline shaft; or, the temperature sensor is fixedly arranged in a hollow area inside the spline shaft in a non-contact manner, and the temperature sensor is not in contact with the spline shaft; The process of the simulation module performing temperature simulation calibration on the hollow area inside the spline shaft and the motor rotor to obtain a multivariate regression equation includes: When the motor corresponding to the motor rotor is at the first speed and the third load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+d; Alternatively, when the motor corresponding to the motor rotor is at a first speed and a first load, a multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d; Alternatively, when the motor corresponding to the motor rotor is at the third speed and the first load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+c*Load+d; Alternatively, when the motor corresponding to the motor rotor is at the second speed and the second load, the multivariate regression equation obtained by temperature simulation calibration of the hollow area inside the spline shaft and the motor rotor is: Trotor = a*Tshaft+b*RPM+c*Load+d; In the above formula, Trotor represents the motor rotor temperature, Tshaft represents the temperature of the hollow area inside the spline shaft, RPM represents the motor speed, Load represents the motor load, a, b, c, d represent the influence coefficients, which are constant values; The first speed is greater than the second speed, and the second speed is greater than the third speed; the first load is greater than the second load, and the second load is greater than the third load.

9. A motor rotor temperature field testing device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the motor rotor temperature field testing method as claimed in any one of claims 1 to 6.

10. A motor rotor, characterized in that: The motor rotor is applied to the motor rotor temperature field testing method as described in any one of claims 1 to 6 above; or the motor rotor is applied to the motor rotor temperature field testing system as described in claim 7 or 8 above; Wherein, the motor rotor is locked by a spline shaft and rotates driven by the spline shaft, and the spline shaft has a hollow area.

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