Field measurement method and device for Young modulus of motor stator core structure

Abstract

The invention relates to a Young modulus field measurement method and device of a motor stator core structure, and belongs to the technical field of structural dynamics parameter measurement, the Young modulus field measurement method of the motor stator core structure comprises the following steps: controlling a first probe to emit a first pulse signal, and controlling a second probe to receive a second pulse signal, the first probe and the second probe are respectively arranged at two axial ends of a motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; and determining the Young modulus of the motor stator core structure based on the first pulse signal and the second pulse signal. The Young modulus measurement of the motor stator core structure is realized, the specific shape of the motor stator core structure is not limited any more, and the applicability of the Young modulus measurement scheme is improved.

Description

Technical Field

[0001] The invention relates to the technical field of structural dynamics parameter measurement, and in particular to an on-site measurement method and device for the Young's modulus of a motor stator core structure. Background Art

[0002] In the structural acoustic design of propulsion motors, it is generally necessary to avoid the coupled resonance between the structural modal characteristics and the electromagnetic excitation characteristics, and the key to the accurate calculation of the structural modal characteristics is the accuracy of the Young's modulus. Since the stator core, the acoustic key component of the propulsion motor, is made of laminated silicon steel sheets, its Young's modulus is different from that of conventional steel structures.

[0003] The traditional Young's modulus measurement method is only applicable to standard specimens of specific shapes and is not suitable for the measurement of Young's modulus of the motor stator core structure. Summary of the invention

[0004] In view of this, it is necessary to provide a field measurement method and device for the Young's modulus of a motor stator core structure to solve the problem that the traditional Young's modulus measurement method is only applicable to standard specimens of a specific shape and is not applicable to the Young's modulus measurement of a motor stator core structure.

[0005] In order to solve the above problems, the present invention provides a method for measuring the Young's modulus of a motor stator core structure on site, comprising: Control the first probe to transmit a first pulse signal, and control the second probe to receive a second pulse signal, wherein the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; Based on the first pulse signal and the second pulse signal, a Young's modulus of the motor stator core structure is determined.

[0006] In a possible implementation, determining the Young's modulus of the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation speed of the first pulse signal in the stator core structure of the motor; Based on the propagation speed of the first pulse signal in the motor stator core structure, the Young's modulus of the motor stator core structure is determined.

[0007] In a possible implementation, determining the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure includes: The Young's modulus of the motor stator core structure is determined based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure.

[0008] In a possible implementation, determining the Young's modulus of the motor stator core structure based on a propagation speed of the first pulse signal in the motor stator core structure, a Poisson's ratio of the motor stator core structure, and a density of the motor stator core structure includes: The Young's modulus of the motor stator core structure is determined based on the following formula:

[0009] in, represents the Young's modulus of the motor stator core structure, represents the Poisson's ratio of the motor stator core structure, represents the density of the motor stator core structure, Represents the propagation speed of the first pulse signal in the stator core structure of the motor.

[0010] In a possible implementation, determining a propagation speed of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation time of the first pulse signal in the stator core structure of the motor; Based on the propagation time of the first pulse signal in the stator core structure of the motor and the axial length of the stator core structure of the motor, a propagation speed of the first pulse signal in the stator core structure of the motor is determined.

[0011] In a possible implementation, determining the propagation time of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: The first pulse signal and the second pulse signal are subjected to time domain analysis to obtain a propagation time of the first pulse signal in the stator core structure of the motor.

[0012] In a possible implementation manner, the first probe and the second probe are ultrasonic probes, and the first pulse signal and the second pulse signal are ultrasonic pulse signals.

[0013] The present invention also provides a field measurement device for the Young's modulus of a motor stator core structure, comprising: A control module, used for controlling the first probe to transmit a first pulse signal, and controlling the second probe to receive a second pulse signal, wherein the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; A determination module is used to determine the Young's modulus of the motor stator core structure based on the first pulse signal and the second pulse signal.

[0014] The present invention also provides an electronic device, including a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the on-site measurement method of the Young's modulus of the motor stator core structure as described above is implemented.

[0015] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the on-site measurement method of the Young's modulus of the motor stator core structure as described above is implemented.

[0016] The beneficial effects of the present invention are as follows: the on-site measurement method and device for the Young's modulus of the motor stator core structure provided by the present invention measures the Young's modulus of the motor stator core structure by propagating a pulse signal in the motor stator core structure, and no longer restricts the specific shape of the motor stator core structure. While realizing the measurement of the Young's modulus of the motor stator core structure, the present invention no longer restricts the specific shape of the motor stator core structure, thereby improving the applicability of the Young's modulus measurement scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of an embodiment of a method for on-site measurement of the Young's modulus of a motor stator core structure provided by the present invention; Figure 2 A schematic structural diagram of an embodiment of a Young's modulus measuring device provided by the present invention; Figure 3 A structural schematic diagram of an embodiment of a device for on-site measurement of Young's modulus of a motor stator core structure provided by the present invention; Figure 4 A schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the description of the present invention, reference to an "embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the described embodiments may be combined with other embodiments.

[0021] In the structural acoustic design of propulsion motors, it is generally necessary to avoid the coupled resonance between the structural modal characteristics and the electromagnetic excitation characteristics, and the key to the accurate calculation of the structural modal characteristics is the accuracy of the Young's modulus. Since the stator core, the acoustic key component of the propulsion motor, is made of laminated silicon steel sheets, its Young's modulus is different from that of conventional steel structures.

[0022] There are four main commonly used methods for testing Young's modulus, including forced resonance method, forced non-resonance method, finite element inversion method, and wave velocity method.

[0023] For the forced resonance method, when the sample vibrates under force, if the frequency of the applied stress change is the same as the natural vibration frequency of the sample, resonance can be generated. The basic principle of the test can be attributed to the determination of the natural vibration frequency of the sample. According to the form used to excite the sample vibration, it can be divided into longitudinal resonance method, bending resonance method and torsional resonance method. This method has a low measurable frequency range and is limited to discrete resonance frequency points. It has strict requirements on the shape and size of the sample and is not suitable for the measurement of Young's modulus of complex structural components such as stator cores.

[0024] For the forced non-resonance method, also known as the sinusoidal force excitation method, the material is usually made into a specimen of a certain specification, such as a rectangle or a cylinder (its shape factor is considered to be equal to 1, and the shape of the specimen has little effect on the test), which is clamped (or bonded with an adhesive) in the measurement system, and a sinusoidal stress (tensile, bending, shear, etc.) is used to excite the specimen to make it vibrate and produce corresponding deformation. The stress and displacement period amplitude applied to the specimen and the phase angle between them are measured, and then the Young's modulus of the material is calculated based on the measured parameter values. This method has a low measurable frequency range and has strict requirements on the test shape and size. It is not suitable for the measurement of Young's modulus of complex structural components such as stator cores.

[0025] The finite element inversion method is a new test method based on the finite element technology to invert the dynamic parameters of the material. Generally, the harmonic response of the material surface is obtained through vibration testing, and then the material to be tested is modeled, the boundary conditions are determined, and the initial modulus, loss factor, and Poisson's ratio are set. The values ​​are substituted into the finite element program for calculation to obtain the harmonic response of the corresponding measuring point. This result is compared with the actual test result to determine whether the simulation result matches the test result. If it does not match, the dynamic parameters such as Young's modulus are changed and substituted into the finite element program for recalculation until they match. This method generally has multiple solutions in the inversion process, which requires judgment based on experience, and the frequency points in a wide frequency range need to be inverted and calculated one by one. This is not only time-consuming and long-lasting, but also ignores the coupling influence of other frequency points. Its accuracy needs to be studied.

[0026] For the wave velocity method, it is mainly based on the dispersion and attenuation characteristics of stress waves in the material, that is, by performing fast Fourier transform analysis on the measurement curves of different points in the medium recorded simultaneously, the wave propagation speed and attenuation coefficient in the sample are obtained, and finally the Young's modulus of the material is calculated; the theory of this method is relatively complete, but it is mainly used for the measurement of Young's modulus of rod-shaped samples.

[0027] In view of the shortcomings of the above-mentioned testing method, the present invention proposes a method for measuring the Young's modulus of a motor stator core structure on site.

[0028] The specific embodiments are described in detail below: A specific embodiment of the present invention discloses a method for measuring the Young's modulus of a motor stator core structure on site. Figure 1 Come and see, Figure 1 A schematic flow chart of an embodiment of a method for measuring the Young's modulus of a motor stator core structure on site provided by the present invention, comprising step S101 and step S102, wherein: In step S101, the first probe is controlled to transmit a first pulse signal, and the second probe is controlled to receive a second pulse signal, the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; In step S102, the Young's modulus of the motor stator core structure is determined based on the first pulse signal and the second pulse signal.

[0029] During implementation, a first probe and a second probe can be respectively set at the axial ends of the motor stator core structure, and then the first probe is controlled to transmit a first pulse signal, and the second probe is controlled to receive a pulse signal (i.e., a second pulse signal) obtained after the first pulse signal is propagated and attenuated in the motor stator core structure, and then the Young's modulus of the motor stator core structure is determined based on the first pulse signal and the second pulse signal.

[0030] The on-site measurement method of the Young's modulus of the motor stator core structure provided by the present invention can be applied to the Young's modulus measurement scenario of the motor stator core structure, and can also be applied to the Young's modulus measurement scenario of other irregularly shaped samples, and the present invention does not make specific limitations on this.

[0031] Compared with the prior art, the on-site measurement method of the Young's modulus of the motor stator core structure provided in this embodiment measures the Young's modulus of the motor stator core structure by propagating a pulse signal in the motor stator core structure, and is no longer restricted to the specific shape of the motor stator core structure. While realizing the measurement of the Young's modulus of the motor stator core structure, the present invention no longer restricts the specific shape of the motor stator core structure, thereby improving the applicability of the Young's modulus measurement scheme.

[0032] Exemplarily, determining the Young's modulus of the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation speed of the first pulse signal in the stator core structure of the motor; Based on the propagation speed of the first pulse signal in the motor stator core structure, the Young's modulus of the motor stator core structure is determined.

[0033] Specifically, when determining the Young's modulus of the motor stator core structure based on the first pulse signal and the second pulse signal, the propagation speed of the first pulse signal in the motor stator core structure can be first determined based on the first pulse signal and the second pulse signal, and then the Young's modulus of the motor stator core structure can be further determined based on the propagation speed of the first pulse signal in the motor stator core structure.

[0034] Exemplarily, determining the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure includes: The Young's modulus of the motor stator core structure is determined based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure.

[0035] Specifically, when determining the Young's modulus of the motor stator core structure according to the propagation speed of the first pulse signal in the motor stator core structure, the Young's modulus of the motor stator core structure can be determined according to the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure.

[0036] Exemplarily, determining the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure includes: The Young's modulus of the motor stator core structure is determined based on the following formula:

[0037] in, represents the Young's modulus of the motor stator core structure, represents the Poisson's ratio of the motor stator core structure, represents the density of the motor stator core structure, Represents the propagation speed of the first pulse signal in the stator core structure of the motor.

[0038] Specifically, when determining the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure, the Young's modulus of the motor stator core structure can be determined by the above formula.

[0039] Exemplarily, determining the propagation speed of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation time of the first pulse signal in the stator core structure of the motor; Based on the propagation time of the first pulse signal in the stator core structure of the motor and the axial length of the stator core structure of the motor, a propagation speed of the first pulse signal in the stator core structure of the motor is determined.

[0040] Specifically, when determining the propagation speed of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal, the propagation time of the first pulse signal in the stator core structure of the motor can be determined based on the first pulse signal and the second pulse signal, and then the propagation speed of the first pulse signal in the stator core structure of the motor can be determined based on the propagation time of the first pulse signal in the stator core structure of the motor and the axial length of the stator core structure of the motor.

[0041] For example, the propagation speed of the first pulse signal in the motor stator core structure can be determined by the following formula:

[0042] in, Indicates the propagation speed of the first pulse signal in the motor stator core structure, represents the propagation time of the first pulse signal in the motor stator core structure, Indicates the axial length of the motor stator core structure.

[0043] Exemplarily, determining the propagation time of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: The first pulse signal and the second pulse signal are subjected to time domain analysis to obtain a propagation time of the first pulse signal in the stator core structure of the motor.

[0044] Specifically, when determining the propagation time of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal, the time domain waveforms of the first pulse signal and the second pulse signal can be analyzed in the time domain. For example, the first pulse signal and the second pulse signal are connected to an oscilloscope for time domain analysis to obtain the propagation time of the first pulse signal in the stator core structure of the motor.

[0045] Exemplarily, the first probe and the second probe are ultrasonic probes, and the first pulse signal and the second pulse signal are ultrasonic pulse signals.

[0046] Specifically, the first probe and the second probe for transmitting and receiving signals may be ultrasonic probes, and correspondingly, the first pulse signal and the second pulse signal may be ultrasonic pulse signals. Of course, the first pulse signal and the second pulse signal may also be other forms of pulse signals, and the first probe and the second probe may correspond to the type of the pulse signal, and the present invention does not specifically limit this.

[0047] The following is a specific application scenario to better illustrate the technical solution of the present invention: According to the wave propagation principle of stress waves in the core structure, the present invention uses an ultrasonic pulse signal transmitter / receiver to generate an ultrasonic signal in the axial direction of the stator core, measures the propagation waveform of the wave in the axial direction of the stator core through an ultrasonic probe and calculates the propagation speed, thereby calculating the Young's modulus of the core structure component.

[0048] Combination Figure 2 Come and see, Figure 2This is a structural schematic diagram of an embodiment of a Young's modulus measuring device provided by the present invention. The measuring device mainly includes an ultrasonic pulse transmitter / receiver, an ultrasonic probe, an oscilloscope and a motor stator core structure.

[0049] The specific steps for measuring Young's modulus are as follows: 1. Build a measuring device: determine the ultrasonic excitation application point and propagation signal receiving point of the stator core structure, and build a measuring device using an ultrasonic pulse transmitter / receiver, an ultrasonic probe, and an oscilloscope.

[0050] 2. Excitation signal transmission: An ultrasonic pulse signal is emitted by an ultrasonic pulse transmitter / receiver, and the ultrasonic probe is used to stimulate the end position of one axial end of the stator core. The ultrasonic probe adopts an integrated transmitting and receiving probe. While emitting ultrasonic pulses, it can collect the transmitting pulses and collect the time domain waveform to the oscilloscope.

[0051] 3. Receiving propagation signals: Another ultrasonic probe is arranged at the end position of the other axial end of the stator core to collect the receiving signal of the ultrasonic pulse propagating axially to the other end of the stator core and collect the time domain waveform to the oscilloscope.

[0052] 4. Calculation of propagation velocity: Based on the time domain waveforms of the transmitted and received signals collected by the oscilloscope, the axial propagation distance of the ultrasonic pulse along the stator core can be obtained. The required propagation time , and then calculate the propagation speed:

[0053] 5. Young's modulus identification: according to the density of the stator core structural components and Poisson's ratio , Young's modulus is calculated:

[0054] In view of the problems that traditional testing methods can only be used for standard samples and have a low test frequency, the present invention measures the propagation speed of ultrasonic pulses in the axial direction of the stator core based on the principle of wave velocity method, and then calculates the Young's modulus. It has the advantages of simple and convenient operation, accuracy and reliability, and can provide accurate input for the calculation of motor structure vibration characteristics.

[0055] The embodiment of the present invention also provides a device for measuring the Young's modulus of a motor stator core structure on site. Figure 3 Come and see, Figure 3 The present invention is a schematic structural diagram of an embodiment of a Young's modulus field measuring device for a motor stator core structure provided by the present invention. The Young's modulus field measuring device 300 for a motor stator core structure includes: The control module 301 is used to control the first probe to transmit a first pulse signal and control the second probe to receive a second pulse signal, wherein the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; The determination module 302 is used to determine the Young's modulus of the stator core structure of the motor based on the first pulse signal and the second pulse signal.

[0056] The specific implementation of each module of the on-site measurement device for the Young's modulus of the motor stator core structure can refer to the description of the on-site measurement method for the Young's modulus of the motor stator core structure, and has similar beneficial effects, which will not be repeated here.

[0057] The embodiment of the present invention further provides an electronic device, Figure 4 Come and see, Figure 4 This is a structural schematic diagram of an embodiment of an electronic device provided by the present invention. The electronic device 400 includes a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the processor 401 executes the program, the on-site measurement method of the Young's modulus of the motor stator core structure as described above is implemented.

[0058] As a preferred embodiment, the electronic device 400 further includes a display 403 for displaying that the processor 401 executes the method for measuring the Young's modulus of the stator core structure of the motor in the field as described above.

[0059] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in the memory 402, and executed by the processor 401 to complete the present invention. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 400. For example, the computer program may be divided into the control module 301 and the determination module 302 in the above embodiment, and the specific functions of each module are as described above, and are not described one by one here.

[0060] The electronic device 400 may be a desktop computer, a notebook, a PDA or a smart phone with an adjustable camera module.

[0061] Among them, the processor 401 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 401 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0062] The memory 402 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electric erasable programmable read-only memory (EEPROM), etc. The memory 402 is used to store programs, and the processor 401 executes the program after receiving the execution instruction. The process definition method disclosed in any of the embodiments of the present invention may be applied to the processor 401 or implemented by the processor 401.

[0063] The display 403 may be an LCD display screen or an LED display screen, for example, a display screen on a mobile phone.

[0064] Understandably, Figure 4 The structure shown is only a schematic diagram of the structure of the electronic device 400. The electronic device 400 may also include Figure 4 More or fewer components as shown. Figure 4 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0065] The electronic device provided according to the above embodiment of the present invention can be implemented with reference to the specific description of the method for on-site measurement of Young's modulus of the motor stator core structure according to the present invention, and has similar beneficial effects as the method for on-site measurement of Young's modulus of the motor stator core structure, which will not be repeated here.

[0066] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the on-site measurement method of the Young's modulus of the motor stator core structure as described above is implemented.

[0067] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable media except the signal itself that is temporarily propagating.

[0068] Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0069] Computer program codes for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages, in particular, Python suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. may be used. The program code may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0070] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0071] The present invention discloses a method and device for measuring the Young's modulus of a motor stator core structure on site. The Young's modulus of the motor stator core structure is measured by propagating a pulse signal in the motor stator core structure. The specific shape of the motor stator core structure is no longer restricted. While realizing the measurement of the Young's modulus of the motor stator core structure, the present invention no longer restricts the specific shape of the motor stator core structure, thereby improving the applicability of the Young's modulus measurement scheme.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for measuring the Young's modulus of a motor stator core structure on site, characterized in that: include: Control the first probe to transmit a first pulse signal, and control the second probe to receive a second pulse signal, wherein the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; Based on the first pulse signal and the second pulse signal, a Young's modulus of the motor stator core structure is determined.

2. The on-site measurement method of Young's modulus of a motor stator core structure according to claim 1, characterized in that: The determining of the Young's modulus of the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation speed of the first pulse signal in the stator core structure of the motor; Based on the propagation speed of the first pulse signal in the motor stator core structure, the Young's modulus of the motor stator core structure is determined.

3. The on-site measurement method of Young's modulus of a motor stator core structure according to claim 2, characterized in that: The determining of the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure comprises: The Young's modulus of the motor stator core structure is determined based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure.

4. The on-site measurement method of Young's modulus of a motor stator core structure according to claim 3, characterized in that: The determining of the Young's modulus of the motor stator core structure based on the propagation speed of the first pulse signal in the motor stator core structure, the Poisson's ratio of the motor stator core structure, and the density of the motor stator core structure includes: The Young's modulus of the motor stator core structure is determined based on the following formula: in, represents the Young's modulus of the motor stator core structure, represents the Poisson's ratio of the motor stator core structure, represents the density of the motor stator core structure, Represents the propagation speed of the first pulse signal in the stator core structure of the motor.

5. The on-site measurement method of Young's modulus of a motor stator core structure according to claim 2, characterized in that: The step of determining a propagation speed of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal includes: Based on the first pulse signal and the second pulse signal, determining a propagation time of the first pulse signal in the stator core structure of the motor; Based on the propagation time of the first pulse signal in the stator core structure of the motor and the axial length of the stator core structure of the motor, a propagation speed of the first pulse signal in the stator core structure of the motor is determined.

6. The on-site measurement method of Young's modulus of a motor stator core structure according to claim 5, characterized in that: The step of determining the propagation time of the first pulse signal in the stator core structure of the motor based on the first pulse signal and the second pulse signal comprises: The first pulse signal and the second pulse signal are subjected to time domain analysis to obtain a propagation time of the first pulse signal in the stator core structure of the motor.

7. The on-site measurement method of Young's modulus of a motor stator core structure according to any one of claims 1 to 6, characterized in that: The first probe and the second probe are ultrasonic probes, and the first pulse signal and the second pulse signal are ultrasonic pulse signals.

8. A field measurement device for the Young's modulus of a motor stator core structure, characterized in that: include: A control module, used for controlling the first probe to transmit a first pulse signal, and controlling the second probe to receive a second pulse signal, wherein the first probe and the second probe are respectively arranged at two axial ends of the motor stator core structure, and the second pulse signal is a pulse signal obtained after the first pulse signal is propagated and attenuated in the motor stator core structure; A determination module is used to determine the Young's modulus of the motor stator core structure based on the first pulse signal and the second pulse signal.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the on-site measurement method of the Young's modulus of the motor stator core structure according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the on-site measurement method for the Young's modulus of the motor stator core structure according to any one of claims 1 to 7 is implemented.

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