Method and system for measuring deformation of motor rotor, and storage medium

Abstract

A method for measuring the deformation of a motor rotor, comprising: step 201, using four displacement sensors (101, 102, 103, 104) to measure the respective distances (hxp, hxn, hyp, hyn) from the surface of a rotor during rotation to the four displacement sensors (101, 102, 103, 104), wherein the four displacement sensors (101, 102, 103, 104) are evenly distributed in the orthogonal direction of a point O, and the point O refers to the center of the rotor when the rotor is in a static state and does not deform; step 202, on the basis of a first radius (R0) of the rotor when the rotor is in a static state and does not deform, the distances (h1, h2, h3, h4) from the surface of the rotor when the rotor is in a static state and does not deform to the four displacement sensors (101, 102, 103, 104), and the measured distances (hxp, hxn, hyp, hyn), determining a second radius (R1) of the rotor during rotation; and step 203, on the basis of the first radius (R0) and the second radius (R1), determining the amount of deformation (δ) of the rotor during rotation. Also provided are a system for measuring the deformation of a motor rotor, and a computer-readable storage medium.

Description

Motor rotor deformation measurement method, system, and storage medium

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311183500.9 filed on September 13, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to motor control technology, and in particular to a method and system for measuring the deformation of a motor rotor, and a storage medium. Background Art

[0004] High-speed permanent magnet motors (PMMs) have attracted widespread attention in the field of new energy vehicle drive motors due to their advantages, including high power density, high efficiency, compact size and weight, and fast dynamic response. However, the pursuit of extreme power density has led to rapidly increasing drive motor speeds, resulting in reduced effective heat dissipation area and heat dissipation difficulties. This, in turn, can lead to significant rotor deformation due to the immense centrifugal forces and thermal expansion in high-speed, high-temperature environments. Excessive deformation significantly increases the risk of motor bore scavenging, compromising safe operation. Therefore, measuring rotor deformation in high-speed, high-temperature environments is essential.

[0005] Summary of the Invention

[0006] In view of this, the motor rotor deformation measurement method, system, and medium provided in this application can realize the real-time measurement of the deformation of the rotor during rotation.

[0007] According to one aspect of an embodiment of the present application, a method for measuring the deformation of a motor rotor is provided, the method comprising: using four displacement sensors to measure the distances between the surface of the rotor and the four displacement sensors during rotation; wherein the four displacement sensors are evenly distributed in orthogonal directions of a point O, and the point O refers to the center of a circle of the rotor when it is in a stationary state and has not been deformed; determining a second radius of the rotor during rotation based on a first radius of the rotor when it is in a stationary state and has not been deformed, the distances between the surface of the rotor when it is in a stationary state and has not been deformed and the four displacement sensors, and the measured distances; and determining the deformation amount of the rotor during rotation based on the first radius and the second radius.

[0008] According to one aspect of an embodiment of the present application, a deformation measurement system for a motor rotor is provided, the system comprising: four displacement sensors and a processor; wherein the four displacement sensors are evenly distributed in orthogonal directions of point O, and point O refers to the center of a circle of the rotor when it is in a stationary state and has not been deformed; the four displacement sensors are used to measure the distances between the surface of the rotor and the four displacement sensors during rotation; the processor is used to determine a second radius of the rotor during rotation based on a first radius of the rotor when it is in a stationary state and has not been deformed, the distances between the surface of the rotor when it is in a stationary state and has not been deformed and the four displacement sensors, and the measured distances; and determine the deformation amount of the rotor during rotation based on the first radius and the second radius.

[0009] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method provided in the embodiment of the present application is implemented.

[0010] In an embodiment of the present application, a method for measuring the deformation of a motor rotor is provided. By measuring the vibration displacement of the rotor during rotation (i.e., the distance between the rotating rotor surface and the displacement sensor) through four displacement sensors evenly arranged in two orthogonal directions, real-time measurement of the rotor deformation is achieved based on this.

[0011] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings herein are incorporated into and constitute a part of this specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, serve to illustrate the technical solutions of the present application. Obviously, the drawings described below are merely some embodiments of the present application. Those skilled in the art can, without inventive effort, derive other drawings from these drawings.

[0013] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0014] FIG1 is a schematic structural diagram of a motor rotor deformation measurement system provided in an embodiment of the present application;

[0015] FIG2 is a schematic diagram of a process for implementing deformation measurement of a motor rotor according to an embodiment of the present application;

[0016] FIG3 is a distribution diagram of displacement sensors and a schematic diagram of rotor real-time deformation calculation in an embodiment of the present application;

[0017] FIG4 is a distribution diagram of displacement sensors and a schematic diagram of rotor real-time deformation calculation in an embodiment of the present application;

[0018] FIG5 is a schematic diagram of a rotor structure that is symmetrical along any radial direction in an embodiment of the present application;

[0019] FIG6 is a schematic diagram of a rotor structure that is not symmetrical along any radial direction in an embodiment of the present application;

[0020] FIG7 is a schematic diagram of a deformation curve of a rotor in an embodiment of the present application when the rotor is deformed non-uniformly along the radial direction. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not intended to limit the scope of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0023] In the following description, references to “some embodiments,” “this embodiment,” “embodiments of the present application,” and examples, etc., describe a subset of all possible embodiments. However, it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

[0024] The descriptions such as "first, second, third" appearing in the embodiments of this application are only for illustration and distinction of the described objects. There is no order, nor does it indicate any special limitation on the number of devices in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application.

[0025] Excessive deformation of a motor rotor during high-speed operation significantly increases the risk of motor bore scraping, jeopardizing safe operation. Therefore, it is essential to study the deformation patterns and influencing factors of motors in high-speed, high-temperature environments and conduct experimental verification.

[0026] In related schemes, the main method for testing rotor deformation in high-speed motors or high-speed rotating machinery is the plastic deformation observation method, which controls the rotor to run at a high speed and stops when the rotor undergoes obvious plastic deformation visible to the naked eye. The rotor speed at this time is recorded as the maximum design speed of the motor. The main shortcomings of the plastic deformation observation method are as follows:

[0027] (1) It is difficult to obtain the real-time deformation of the rotor during operation at different speeds, and there is a great safety risk.

[0028] (2) It is difficult to measure the real-time deformation of the rotor under complex operating conditions such as high temperature, load or impact, and it is impossible to provide an effective verification method for the strength design of the high-speed motor rotor.

[0029] Based on the above analysis, an embodiment of the present application provides a deformation measurement system for a motor rotor. FIG1 is a structural schematic diagram of the deformation measurement system for a motor rotor provided in an embodiment of the present application. As shown in FIG1 , the deformation measurement system 10 for a motor rotor includes four displacement sensors 101, 102, 103, and 104 and a processor 105; wherein the four displacement sensors 101, 102, 103, and 104 are evenly distributed in orthogonal directions of point O, where point O refers to the center of the rotor when it is in a stationary state and has not been deformed, that is, the center of the dotted circle 106 shown in FIG1 , and the dotted circle 106 refers to a schematic diagram of the rotor when it is in a stationary state and has not been deformed;

[0030] The four displacement sensors 101, 102, 103 and 104 are used to measure the distances between the surface of the rotor (ie, the solid circle 107 shown in FIG1 ) and the rotor during rotation, ie, h shown in FIG1 . xp 、h xn 、h yp and h yn ;

[0031] The processor 105 is configured to calculate the distances h1, h2, h3 and h4 between the rotor surface and the four displacement sensors 101, 102, 103 and 104 according to the first radius R0 when the rotor is in a stationary state and not deformed, and the measured distance h xp 、h xn 、h yp and h yn , determining a second radius R1 of the rotor during the rotation process; and determining a deformation amount of the rotor during the rotation process based on the first radius R0 and the second radius R1.

[0032] During implementation, the four displacement sensors 101, 102, 103 and 104 can be non-contact displacement sensors such as eddy current displacement sensors or laser displacement sensors with advantages such as high precision, high sensitivity, fast sampling speed and wide linear measurement range. The processor 105 can be an AI acceleration engine (such as NPU, etc.), GPU, central processing unit (CPU), microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA), etc.

[0033] Based on the above-mentioned deformation measurement system 10, an embodiment of the present application provides a method for measuring the deformation of a motor rotor. FIG2 is a schematic diagram of an implementation flow of the method for measuring the deformation of a motor rotor provided in an embodiment of the present application. As shown in FIG2 , the method may include the following steps 201 to 203:

[0034] Step 201: Using four displacement sensors, measure the distance between the rotor surface and the four displacement sensors during rotation; wherein the four displacement sensors are evenly distributed in orthogonal directions to point O, where point O is the center of the rotor when it is stationary and not deformed.

[0035] Step 202: determining a second radius of the rotor during rotation based on the first radius of the rotor when the rotor is stationary and not deformed, the distance between the surface of the rotor and the four displacement sensors when the rotor is stationary and not deformed, and the measured distances;

[0036] Step 203: Determine the deformation of the rotor during the rotation process according to the first radius and the second radius.

[0037] In an embodiment of the present application, a method for measuring the deformation of a motor rotor is provided. In this method, the vibration displacement of the rotor during rotation (i.e., the distance between the rotating rotor surface and the displacement sensor) is measured by four displacement sensors evenly arranged in two orthogonal directions, based on which real-time measurement of the rotor deformation is achieved.

[0038] The deformation measurement method of the motor rotor provided in the embodiment of the present application can realize real-time measurement / online measurement of the deformation of the rotor during rotation. On the one hand, compared with the plastic deformation observation method, the safety risk is relatively small, which is beneficial to conveniently obtain the real-time deformation of the rotor during operation at different speeds; on the other hand, the deformation measurement method provided in the embodiment of the present application is an online measurement method, that is, the measurement can be achieved without stopping the operation during the high-speed operation of the rotor. Therefore, it is beneficial to measure the real-time deformation of the rotor under complex operating conditions such as high temperature, load or impact, thereby providing an effective verification means for the strength design of the high-speed motor rotor; on the other hand, the method is also beneficial to realize online monitoring and fault diagnosis of the rotor health status.

[0039] The following describes further optional implementations and related terms of each of the above steps.

[0040] In step 201, four displacement sensors are used to measure the distance between the surface of the rotor and the four displacement sensors during rotation; wherein the four displacement sensors are evenly distributed in orthogonal directions of point O, and point O refers to the center of the rotor when it is in a stationary state and has not been deformed.

[0041] In the embodiments of the present application, there is no limitation on the displacement sensor, which may be an eddy current displacement sensor, a laser displacement sensor, or other non-contact displacement sensors with advantages such as high precision, high sensitivity, fast sampling speed and wide linear measurement range.

[0042] In the embodiment of the present application, the distances between the four displacement sensors and the rotor surface when stationary and undeformed are all greater than 0, i.e., the four displacement sensors are non-contact displacement sensors. In the embodiment of the present application, the relationship between the distances between the four displacement sensors and point O is not limited; i.e., h1, h2, h4, and h5 can be the same value or different values. It is understood that h1, h2, h4, and h5 respectively represent the distances between sensors 101 to 104 and the center of the rotor when the rotor is stationary and undeformed.

[0043] In some embodiments, as shown in FIG3 (where the processor 105 is not shown), the four displacement sensors 101 to 104 are evenly distributed in orthogonal directions of different lengths from point O, that is, at least two distance values ​​among h1, h2, h4 and h5 are not equal.

[0044] In other embodiments, as shown in Figure 4 (wherein the processor 105 is not shown), the four displacement sensors 101 to 104 are evenly distributed in orthogonal directions with the same length from point O, that is, h1, h2, h4 and h4 are equal, therefore, h1, h2, h4 and h4 are all represented as h in Figure 4.

[0045] The four displacement sensors 101 to 104 are at the same distance from point O. This, on the one hand, is beneficial to simplifying the method of calculating the deformation of the rotor during rotation, thereby saving computing overhead; on the other hand, setting the four displacement sensors 101 to 104 at the same distance from point O is beneficial to improving the measurement accuracy of the deformation.

[0046] In one possible implementation, a bracket is positioned around the motor rotor. Four displacement sensors are fixed to the bracket and evenly distributed in orthogonal directions relative to point O. The probes of the four displacement sensors are aligned with the rotor surface. In some embodiments, the four displacement sensors are used to simultaneously measure the distance between the rotor surface and each of the four displacement sensors during rotation.

[0047] In this embodiment of the present application, the distances between the rotor surface and the four displacement sensors are measured simultaneously during rotation. This distance is measured in real time, allowing for accurate acquisition of the rotor's second radius during rotation, which in turn facilitates more precise deformation measurement. In step 202, the rotor's second radius during rotation is determined based on the rotor's first radius when stationary and undeformed, the distances between the rotor surface and the four displacement sensors when stationary and undeformed, and the measured distances.

[0048] Regarding the positional relationship between the displacement sensor and the rotor shown in FIG3 , in some embodiments, step 202 may be implemented as follows: determining the second radius of the rotor during rotation according to the following formula (1):

[0049] Wherein, R1 represents the second radius, R0 represents the first radius, h3, h4, h1 and h2 respectively represent the distances between the rotor surface and the four displacement sensors 103, 104, 101 and 102 when the rotor is in a stationary state and has not been deformed, and h yn 、h yp 、h xn and h xp The measured distances between the rotor surface and the four displacement sensors 104, 103, 102 and 101 during the rotation process are used to measure h yn and h yp The two displacement sensors are located at the two ends of the y-axis passing through the point O, respectively, to measure h xn and h xp The two displacement sensors are respectively located at two ends of an x-axis passing through the point O, and the x-axis is orthogonal to the y-axis.

[0050] It should be noted that the calculation formula of R1 is derived from the geometric relationship between the radius of the rotor before and after deformation and the measured distances between the rotor surface and the four displacement sensors during rotation.

[0051] As shown in Figure 3, the dotted circle in Figure 3 represents the rotor profile when it is in a stationary state and has not been deformed. Its center is O and its radius is R0. At this time, the distances between the rotor surface and the probe tips of the four orthogonally arranged sensors 101, 102, 103 and 104 are h1, h2, h4 and h4. The solid circle represents the rotor profile after deformation due to centrifugal force or thermal expansion during high-speed operation. The coordinates of its center A are (x, y) and its radius is R1. xp 、h xn 、h yp , and h yn The real-time distance between the rotor surface and the sensor end during high-speed rotation is measured by the four sensors 101 to 104.

[0052] Combining formula (2) and formula (3) we can get

[0053] Combining formula (4) and formula (5) we can get

[0054] From formula (2), the radius R1 of the rotor after deformation is:

[0055] Substituting equations (6) and (7) into equation (8), we can obtain

[0056] It should be noted that there is no limitation on the calculation method for determining the second radius. You can first determine x and y and then substitute them into formula (8) to calculate the second radius, or you can directly use formula (9) to calculate the second radius. In short, using one or more of the above formulas in combination to obtain the deformation of the rotor during rotation falls within the scope of protection of this application.

[0057] Regarding the positional relationship between the displacement sensor and the rotor shown in FIG4 , in some embodiments, step 202 may be implemented as follows: determining the second radius of the rotor during rotation according to the following formula (10):

[0058] Wherein, R1 represents the second radius, R0 represents the first radius, h represents the distance between the rotor surface and the four displacement sensors when the rotor is in a stationary state and has not deformed, and h yn 、h yp 、h xn and h xpThe measured distances between the rotor surface and the four displacement sensors 104, 103, 102 and 101 during the rotation process are used to measure h yn and h yp The two displacement sensors are located at the two ends of the y-axis passing through the point O, respectively, to measure h xn and h xp The two displacement sensors are respectively located at two ends of an x-axis passing through the point O, and the x-axis is orthogonal to the y-axis.

[0059] It should be noted that the calculation formula of R1 is derived from the geometric relationship between the radius of the rotor before and after deformation and the measured distances between the rotor surface and the four displacement sensors during rotation.

[0060] As shown in Figure 4, the dotted circle in Figure 4 represents the rotor profile when it is in a stationary state and has not been deformed. Its center is O and its radius is R0. At this time, the distance between the rotor surface and the ends of the four orthogonally arranged sensor probes is h. The solid circle represents the rotor profile after deformation due to centrifugal force or thermal expansion during high-speed operation. The coordinates of its center A are (x, y) and its radius is R1. xp 、h xn 、h yp , and h yn The real-time distance between the rotor surface and the sensor end during high-speed rotation is measured by four sensors.

[0061] Combining formula (11) and formula (12) we can get

[0062] Combining equations (13) and (14), we can get

[0063] From formula (11), the radius R1 of the rotor after deformation is:

[0064] Substituting equations (15) and (16) into equation (17), we can obtain

[0065] It should be noted that there is no limitation on the calculation method for determining the second radius. You can first determine x and y and then substitute them into formula (17) to calculate the second radius, or you can directly use formula (18) to calculate the second radius. In short, using one or more of the above formulas in combination to obtain the deformation of the rotor during rotation falls within the scope of protection of this application.

[0066] In step 203 , the deformation amount of the rotor during the rotation process is determined according to the first radius and the second radius.

[0067] In some embodiments, step 203 may be implemented as follows: determining the deformation of the rotor during the rotation process according to the difference between the first radius and the second radius.

[0068] For example, with respect to the positional relationship between the displacement sensor and the rotor shown in FIG3 , in some embodiments, the deformation δ of the rotor during rotation can be calculated according to the following formula (19):

[0069] For example, with respect to the positional relationship between the displacement sensor and the rotor shown in FIG4 , in some embodiments, the deformation δ of the rotor during rotation can be calculated according to the following formula (20):

[0070] The following describes an exemplary application of the embodiments of the present application in a practical application scenario.

[0071] In an embodiment of the present application, a real-time deformation measurement method for a high-speed motor rotor during actual operation is provided, and a measurement system consisting of four non-contact displacement sensors and a processor distributed in orthogonal directions is provided. In the measurement system, the four non-contact displacement sensors are evenly distributed in orthogonal directions of the same length from point O, as shown in FIG4 . The dotted circle in FIG4 represents the rotor profile when it is in a stationary state and has not been deformed (the rotor profile here can be understood as the rotor in a stationary state and has not been deformed in the foregoing text), the center of the circle is O, and the radius is R0. At this time, the length between the rotor surface and the ends of the four orthogonally arranged displacement sensor probes (which can be understood as displacement sensors) is h. The solid circle represents the profile of the rotor after deformation due to factors such as centrifugal force or thermal expansion during high-speed operation (the rotor profile here can be understood as the rotor in the rotating process state in the foregoing text), the coordinates of the center A are (x, y), and the radius is R1. h xp 、h xn 、h yp , and h yn The real-time distance between the rotor surface and the end of the displacement sensor (which can be understood as the displacement sensor) during high-speed rotation is measured by the four sensors 101 to 104.

[0072] Combining equations (21) and (22), we can get

[0073] Combining equations (23) and (24), we can get

[0074] From formula (21), the radius R1 of the rotor after deformation is:

[0075] Substituting equations (25) and (26) into equation (27), we can obtain

[0076] Therefore, the real-time deformation of the rotor δ can be expressed as

[0077] It should be noted that h xp 、h xn 、h yp , and h yn It is the distance between the surface of the rotor (the rotor here is the rotor in the rotating process state as mentioned above) and the four displacement sensors 101 to 104 detected by the four non-contact displacement sensors 101 to 104 at the same moment.

[0078] If the motor rotor structure is symmetrical along any radial direction (such as the solid rotor 501 or the surface-mounted permanent magnet synchronous motor rotor 502 shown in Figure 5), it can be considered that the rotor is uniformly deformed along the radial direction, the deformed rotor profile is still a circle, and the deformation δ is basically a constant.

[0079] However, if the rotor structure is not symmetrical along any radial direction (for example, the rotor structure of the type 602 and type V 601 of the internal permanent magnet synchronous motor shown in Figure 6), or the rotor structure is symmetrical along any radial direction but the rotor material distribution or thermal deformation is uneven, the installation is not completely symmetrical, etc., then the rotor will not deform uniformly along the radial direction, and the deformed rotor profile is not a circle. The deformation amount δ is a curve that changes with time as shown in Figure 7. The deformation value δ on the curve is max and δ min They represent the maximum and minimum deformation of the rotor respectively.

[0080] In the embodiment of the present application, four non-contact displacement sensors are evenly arranged in two orthogonal directions to form a displacement measurement system to measure the four vibration distances h of the rotor during high-speed rotation. xp 、h xn 、h yp , and h yn , using the radius before and after the rotor deformation and the four vibration distances h xp 、h xn 、h yp , and h ynThe geometric relationship between them cleverly separates the rotor deformation and its vibration displacement, making it possible to measure the rotor deformation in real time, where the vibration displacement is the radius R1 of the deformed motor. With the help of the advantages of high precision, high sensitivity, fast sampling speed and wide linear measurement range of non-contact displacement sensors such as eddy current displacement sensors or laser displacement sensors, it is possible to achieve high-precision real-time measurement of the deformation of high-speed rotating machinery such as high-speed motors. Compared with the existing technology, on the one hand, the technical solution of the present application has a simple testing method, high measurement accuracy and high safety, and can dynamically measure the rotor deformation information of the rotor in complex operating environments such as high speed, high temperature, load or impact in real time; on the other hand, it can also realize online monitoring of the rotor health status and fault diagnosis.

[0081] It should be noted that although the steps of the method of the present application are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps; or steps in different embodiments may be combined to form a new technical solution.

[0082] The description of the measurement system embodiment above is similar to the description of the method embodiment above, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the measurement system embodiment of this application, please refer to the description of the method embodiment of this application for understanding.

[0083] It should be noted that, in the embodiment of the present application, if the above method is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions to enable the measurement system to execute all or part of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program code, such as a U disk, a mobile hard disk, a read-only memory (ROM), a magnetic disk or an optical disk. In this way, the embodiment of the present application is not limited to any specific combination of hardware and software.

[0084] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method provided in the above embodiment are implemented.

[0085] An embodiment of the present application provides a computer program product containing instructions, which, when executed on a computer, enables the computer to execute the steps of the method provided in the above method embodiment.

[0086] It should be noted that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium, storage medium, and device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0087] The "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments. The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other. For the sake of brevity, they will not be repeated here.

[0088] The term "and / or" in this article is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, object A and / or object B can mean: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0089] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0090] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways.

[0091] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, and other media that can store program codes.

[0092] Alternatively, if the measurement system described above is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application, or the portion that contributes to the relevant technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing the measurement system to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0093] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined, if not in conflict, to obtain new method embodiments. The features disclosed in the several product embodiments provided in this application can be arbitrarily combined, if not in conflict, to obtain new product embodiments. The features disclosed in the several method measurement system embodiments provided in this application can be arbitrarily combined, if not in conflict, to obtain new method embodiment measurement system embodiments.

[0094] The above is merely an embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for measuring the deformation of a motor rotor, wherein: The method comprises: Using four displacement sensors, the distances between the surface of the rotor and the four displacement sensors are measured during the rotation process; wherein the four displacement sensors are evenly distributed in the orthogonal directions of point O, and point O refers to the center of the circle of the rotor when it is in a stationary state and has not been deformed; Determine a second radius of the rotor during rotation according to a first radius when the rotor is stationary and not deformed, a distance between the surface of the rotor and the four displacement sensors when the rotor is stationary and not deformed, and the measured distances; The deformation amount of the rotor during the rotation process is determined according to the first radius and the second radius.

2. The deformation measurement method according to claim 1, wherein: The four displacement sensors are evenly distributed in orthogonal directions with the same distance from point O.

3. The deformation measurement method according to claim 2, wherein: Determining the second radius of the rotor during rotation according to the first radius of the rotor when it is stationary and not deformed, the distance between the surface of the rotor and the four displacement sensors when it is stationary and not deformed, and the measured distances, comprises: The second radius of the rotor during the rotation process is determined according to the following formula: Wherein, R1 represents the second radius, R0 represents the first radius, h represents the distance between the surface and the four displacement sensors when the rotor is in a stationary state and has not deformed, and h yn 、h yp 、h xn and h xp represents the measured distances between the rotor surface and the four displacement sensors during the rotation process, used to measure h yn and h yp The two displacement sensors are located at the two ends of the y-axis passing through the point O, respectively, to measure h xn and h xp The two displacement sensors are respectively located at two ends of an x-axis passing through the point O, and the x-axis is orthogonal to the y-axis.

4. The deformation measurement method according to claim 1, wherein: The method of using four displacement sensors to measure the distances between the surface of the rotor and the four displacement sensors during the rotation process includes: The four displacement sensors are used to measure the distances between the surface of the rotor and the four displacement sensors during the rotation process at the same time.

5. The deformation measurement method according to any one of claims 1 to 4, wherein: Determining the deformation amount of the rotor during the rotation process according to the first radius and the second radius includes: The deformation amount of the rotor during the rotation process is determined according to the difference between the first radius and the second radius.

6. The deformation measurement method according to any one of claims 1 to 4, wherein: The displacement sensor is an eddy current displacement sensor or a laser displacement sensor.

7. A deformation measurement system for a motor rotor, wherein: The deformation measurement system comprises: four displacement sensors and a processor; wherein the four displacement sensors are evenly distributed in the orthogonal directions of point O, and point O refers to the center of the rotor when it is in a stationary state and has not deformed; The four displacement sensors are used to measure the distances between the surface of the rotor and the four displacement sensors during the rotation process; The processor is used to determine the second radius of the rotor during rotation based on the first radius when the rotor is in a stationary state and has not been deformed, the distance between the surface of the rotor and the four displacement sensors when the rotor is in a stationary state and has not been deformed, and the measured distance; and determine the deformation amount of the rotor during rotation based on the first radius and the second radius.

8. The deformation measurement system according to claim 7, wherein: The four displacement sensors are evenly distributed in orthogonal directions with the same distance from point O.

9. The deformation measurement system according to claim 8, wherein: The processor is configured to: The second radius of the rotor during the rotation process is determined according to the following formula: Wherein, R1 represents the second radius, R0 represents the first radius, h represents the distance between the surface and the four displacement sensors when the rotor is in a stationary state and has not deformed, and h yn 、h yp 、h xn and h xp It indicates that the measured surface of the rotor during rotation is respectively in contact with the four displacement sensors Distance, used to measure h yn and h yp The two displacement sensors are located at the two ends of the y-axis passing through the point O, respectively, to measure h xn and h xp The two displacement sensors are respectively located at two ends of an x-axis passing through the point O, and the x-axis is orthogonal to the y-axis.

10. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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