Generator stator winding end dynamic analyzer and use method thereof

Abstract

The invention provides a generator stator winding end dynamic analyzer and a use method thereof. The generator stator winding end dynamic analyzer comprises an analyzer main body, an analysis terminal connected with the analyzer main body, and a plurality of interfaces, an acceleration sensor and an impact hammer which are arranged on the analyzer main body, the impact hammer comprises: a hammer body; a force hammer grip; the dynamic force sensor is arranged at one end of the force hammer body so as to measure dynamic force data; the button group is arranged on the force hammer grip and / or the force hammer body so as to position the measured bar; according to the power generator stator winding end dynamic characteristic analyzer, the force hammer test bar switching button and the force hammer screen display are added on the power generator stator winding end dynamic characteristic analyzer, so that a test bar positioning function in a test process is realized, and a multi-dimensional confirmation function of an operator in the test process is added; the test of each wire rod is ensured to be controlled by each tester in the whole process.

Description

Technical Field

[0001] This invention relates to the technical field of dynamic analysis equipment, and in particular to a dynamic analyzer for the end of a generator stator winding and its usage method. Background Technology

[0002] The stator winding end is the winding portion from the stator core slot to the stator winding nose and its fixed support structure. The ring lead (parallel ring) is the arc segment lead connecting the stator winding nose to the outgoing parallel block. The phase lead is the connection part between the stator winding end ring lead and the stator coil. The main lead is the lead connecting the stator winding end ring lead to the outgoing bushing.

[0003] In accordance with relevant procedures, specifications, and technical standards, during new machine handover, major overhaul, short-circuit impact, stator bar replacement, changes to the stator winding end fixing structure, or when necessary, it is necessary to perform dynamic characteristic measurements on the stator winding ends to check the tightness and wear of the stator winding ends, so as to identify the modal parameters of the generator stator and provide vibration characteristic analysis, vibration fault diagnosis, and prediction for the generator stator.

[0004] The generator stator winding end dynamic characteristic analyzer is a method for measuring the dynamic characteristics of the stator winding ends of a steam turbine generator using the hammer impact method. The analyzer consists of an impact hammer, an accelerometer, and a data analyzer. The impact hammer, also known as a force hammer, is a combination of a hammer body and a dynamic force sensor, and is a commonly used excitation device in modal testing. The energy level and frequency range of the excitation force depend on the magnitude of the operator's force, the mass of the hammer, the hardness of the hammerhead, and the plasticity of the impact point on the structure. The hammer is used to strike the measuring point at the end of the stator winding, while the accelerometer measures its acceleration response. The force and acceleration signals are amplified and sent to the dynamic signal analyzer for analysis, thus obtaining the frequency response function of the structure. The generator stator winding end dynamic characteristic analyzer measures the natural frequencies of the phase leads and main leads at the end of the stator winding, the overall elliptical or four-lobed mode shape of the stator winding end, and the response ratios corresponding to the natural frequencies of the frequency response functions at the stator winding end and the origin of the leads.

[0005] The measurement points for the end-wound overall modal vibration test are located on the cross-sections within the cones at the ends of the steam-side and excitation-side windings, respectively. Figure 3 The three circles shown should have measuring points evenly distributed along each circle. A 2-pole generator should have at least 16 measuring points, and a 4-pole generator should have at least 32 measuring points, arranged from circle 1 to circle 3 (see...). Figure 3 The sequential measurements are shown in the figure.

[0006] Chinese patent document CN207816554U discloses an automatic striking device for a force sensor used in modal testing of generator stator winding ends. This device has a vertical column sleeve on its base plate, on which a sliding rod that moves and is fixed vertically is mounted. A rotating balance bar is mounted on the upper part of the sliding rod via a pivot. A downwardly protruding arc-shaped block is located at the lower part of one end of the balance bar. Below the arc-shaped block, on a base, is a cam whose rotation is controlled by a handle. The cam has a corresponding push rod. A return spring connected to the base plate is mounted on the balance bar between the cam and the sliding rod. A test hammer is mounted on the other end of the balance bar. This invention significantly improves the quality of the force signal during modal testing, greatly increases testing efficiency, significantly shortens testing time, and reduces the labor intensity of testing personnel. However, this automatic striking device for a force sensor used in modal testing of generator stator winding ends is inconvenient for identifying and distinguishing the test bars, and is prone to situations where the impact hammer strikes the test bars and the test bars do not correspond.

[0007] A device for modal testing of wound stators is disclosed in Chinese patent document CN205317905U. This device includes a suspension mechanism for suspending the wound stator in the air and a force hammer with a force sensor. The force hammer is positioned above the suspended wound stator, and the force sensor is connected to a charge adjuster. The outer surface of the wound stator is divided into N equal parts along the circumference, and M measuring points are evenly distributed along the axial direction in each part. An accelerometer is arranged at each measuring point, and all accelerometers are connected to a dynamic signal acquisition device, which is connected to a PC. This invention enables modal testing of wound stators in electric motors; however, because the force hammer is fixed, this device can only perform single-second detection.

[0008] A method for testing the installation reliability of a turbine eddy current vibration sensor is disclosed in Chinese patent document CN112432771B. This method includes the following steps: After the turbine eddy current vibration sensor is installed, before starting the turbine unit, the turbine rotor is rotated at low speed, generating low-frequency excitation as the turbine shaft rotates at low speed; the response signal of the turbine eddy current vibration sensor is collected, and frequency response analysis and time-domain waveform analysis are performed on the response signal; the reliability of the turbine eddy current sensor installation is determined based on the frequency response analysis and time-domain waveform analysis of the response signal. The method provided by the above invention can avoid turbine unit shutdown for maintenance due to turbine eddy current sensor installation problems after startup; the signal test results of the vibration acquisition instrument and velocity sensor are stable and accurate, possessing strong resonance fault diagnosis value; the operation is simple and has good executability, but the testing efficiency of this method for testing the installation reliability of a turbine eddy current vibration sensor is relatively low.

[0009] During testing, the testing personnel operating the testing software and those operating the impact hammer need to work together to test each stator winding. The complex on-site environment during generator testing affects the coordination between testing personnel, often resulting in misalignment between the impact hammer striking the winding and the test winding. Furthermore, with a large number of windings, it is difficult to detect missed tests or misalignments, hindering accurate testing. Therefore, it is particularly necessary to provide a generator stator winding end dynamic characteristic analyzer that is easy to use and allows for convenient switching of the test object during testing. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a dynamic analyzer for the end of a generator stator winding and its usage method.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: A generator stator winding end dynamic analyzer includes an analyzer body, an analysis terminal connected to the analyzer body, and several interfaces provided on the analyzer body; Also includes: An acceleration sensor is mounted on the generator stator winding and is electrically connected to the analyzer body to measure and transmit acceleration data of the generator stator winding. An impact hammer, which is electrically connected to the main body of the analyzer to transmit dynamic force data; The impact hammer includes: The hammer body is electrically connected to the main body of the analyzer to perform hammer impact measurement; A hammer grip is provided on the hammer body; A dynamic force sensor is disposed at one end of the hammer body to measure dynamic force data; A button assembly, which is disposed on the hammer handle and / or the hammer body, for positioning the measured bar; An LCD display screen is disposed on the handle of the hammer and / or the body of the hammer, and the LCD display screen is used to collect and display the data of the dynamic force sensor.

[0012] In the above scheme, by adding a force hammer test bar switching button and a force hammer screen display to the dynamic characteristic analyzer at the end of the generator stator winding, the test bar positioning function is realized during the test. Furthermore, the test personnel operating the impact hammer can monitor the test situation in real time, ensuring that the test process and results are under their own control. The test tool is suitable for testing the natural frequency and vibration of the generator stator winding ends.

[0013] Preferably, the interface includes: A USB connector is located on the main body of the analyzer and is used to connect the analysis terminal to the main body of the analyzer. An SMA connector is provided on the analyzer body and is used to connect the accelerometer sensor to the analyzer body. BNC connector, the BNC connector is provided on the analyzer body, the BNC connector is electrically connected to the data acquisition module of the analyzer body, the BNC connector is used to connect the dynamic force sensor to the analyzer body; An aviation connector is provided on the main body of the analyzer. The aviation connector is electrically connected to the control and display module of the main body of the analyzer. The aviation connector is used to connect the main body of the analyzer to the LCD screen and the button group respectively.

[0014] In the above solution, a reliable physical connection method is provided through the specific design of the interface to avoid signal interference or disconnection; Furthermore, the SMA connector connects to the accelerometer sensor via a coaxial cable to minimize signal loss, and the analyzer switch is waterproof to adapt to humid generator environments.

[0015] Preferably, a first transmission line is connected between the USB connector and the analysis terminal, and the first transmission line is a USB transmission line; A second transmission line is connected between the SMA connector and the speed sensor; the second transmission line is an acceleration signal transmission line. A communication connector is provided on one side of the hammer handle, which is electrically connected to the control and display module of the LCD screen and button group. A fourth transmission line is connected between the communication connector and the aviation connector. The fourth transmission line is the hammer control and display signal transmission line. The end of the hammer handle is provided with a dynamic force sensor force signal BNS connector, which is electrically connected to the data acquisition module in the dynamic force sensor. A third transmission line is connected between the dynamic force sensor force signal BNS connector and the BNC connector, and the third transmission line is the hammer force signal transmission line.

[0016] In the above scheme, a dynamic force sensor is used to receive force signals, an acceleration sensor is used to receive acceleration signals, and the test personnel operating the impact hammer can switch the test bar autonomously during operation through the buttons on the impact hammer, and monitor the real-time data acquisition status through the LCD screen on the impact hammer.

[0017] Preferably, the fourth transmission line is a 7-wire communication line with a 7-core aviation connector for transmission; The 7-pin aviation connector includes: The two-core circuit provides power to the LCD display 20 and the button assembly, with a power supply voltage of DC 3.3V-5V. The three-core refers to the three buttons in the button group; The two cores are SCL (IIC clock line) and SDA (IIC data line). The 7-pin aviation connector has a plug diameter of 15mm and a contact hole diameter of 1mm.

[0018] In the above scheme, a 7-wire communication line with a 7-core aviation connector is used for the control and display signal transmission line of the impact hammer to achieve stable communication between the impact hammer and the control system, support bidirectional data transmission, and enhance reliability and durability.

[0019] Preferably, the button group includes a first button and a third button arranged side by side on the hammer grip; The first button is used to select the next measurement target; The third button is used to select the previous measurement target; The button group uses a microcontroller with an ADC port to read the status of multiple buttons.

[0020] In the above solution, the button group is specifically designed to allow operators to switch test bars independently, support forward, pause and rewind operations, solve the adjustment needs when there are operational errors, and improve testing flexibility.

[0021] Preferably, the liquid crystal display screen is a 4-pin IPS display screen.

[0022] In the above scheme, the test equipment is based on the generator stator winding end dynamic characteristic analyzer, and a bar measurement switching control button and an LCD screen display are added to facilitate the test personnel operating the impact hammer to keep abreast of the test situation in real time and independently control the test process.

[0023] Preferably, the working surface of the dynamic force sensor is provided with an impact hammer rubber head, which covers the sensor.

[0024] In the above scheme, an impact hammer rubber head is set on the working surface of the dynamic force sensor to buffer the impact force, protect the sensor from excessive impact, and standardize the impact force to ensure data consistency, improve equipment life and test repeatability. Furthermore, the rubber head is replaceable, which can adapt to different hardness requirements, reducing the risk of sensor damage and lowering maintenance costs.

[0025] A method for using a generator stator winding end dynamic characteristic analyzer, applied to the aforementioned generator stator winding end dynamic characteristic analyzer, the method comprising: Experimental preparation stage: Turn on the main body of the analyzer and the analysis terminal, and connect the analysis terminal, the acceleration sensor and the impact hammer to the main body of the analyzer respectively; Experimental start phase: Input the number of stator winding bars of the generator under test into the testing software to generate the initial geometry, enter the admittance measurement interface, and start the test on the impact hammer; Experimental procedure: The operator of the impact hammer strikes the stator bar corresponding to the bar number displayed on the hammer's screen ("X**"). If the striking force control fails, the bar display will not change, and an "overload" or "underload" warning will appear on the screen. If the strike is successful, "X**I" will be displayed, and the test will continue. After the bar test is completed, "X**II" will be displayed, and the operator can switch to the next bar using the button group on the impact hammer. This process is repeated until all bars are tested. After the test, the impact hammer is turned off. After the experiment: The experimenters who analyze the experimental data conduct an overall analysis of the experimental data, and some individual experimental data need to be retested; In this system, if the operator of the impact hammer makes a mistake and fails to strike the test bar, the analyzer records the erroneous data. The operator can then adjust the button group, switch to the next test bar, and return to retest the test bar. This allows the operator to easily correct any errors made during the operation.

[0026] Preferably, during the experimental phase, the bar number on the hammer display screen is “X**I”, where ** represents the bar number and the Roman numeral represents the number of successful strikes.

[0027] Preferably, the retesting step includes: selecting the bar to be retested through testing software, the LCD screen (20) displays the corresponding bar number, and the operator performs the retest according to the displayed bar number.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. The present invention adds a force hammer test bar switching button and a force hammer screen display to the dynamic characteristic analyzer at the end of the generator stator winding, realizes the test bar positioning function during the test, and adds a multi-dimensional confirmation function for the operator during the test, ensuring that the test of each bar is supervised by every tester throughout the process. The design is reasonable and easy to use.

[0029] 2. Through the specific design of the button group, this invention allows operators to switch test bars independently, supports forward, pause and rewind operations, solves the adjustment needs when there is an operational error, improves testing flexibility, and the ADC port supports multi-button detection with fast response speed, thus improving operating efficiency. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the operation of the generator stator winding end dynamic characteristic analyzer of the present invention.

[0032] Figure 2 This is a schematic diagram of the force hammer of the generator stator winding end dynamic characteristic analyzer of the present invention.

[0033] Figure 3 This is a schematic diagram showing the location of the measuring points in the end-body modal vibration test.

[0034] Explanation of reference numerals in the attached figures: In the diagram: 1. Analyzer main body; 2. Analysis terminal; 3. Accelerometer sensor; 4. Impact hammer; 5. USB connector; 6. SMA connector; 7. BNC connector; 8. Aviation connector; 9. Analyzer switch; 10. First transmission line; 11. Second transmission line; 12. Third transmission line; 13. Fourth transmission line; 14. Impact hammer rubber head; 15. Dynamic force sensor; 16. Hammer body; 17. First button; 18. Second button; 19. Third button; 20. LCD screen; 21. Communication connector; 22. Hammer handle; 23. Dynamic force sensor force signal BNS connector. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] First, it needs to be clarified that the stator winding end refers to the winding portion from the stator core slot opening to the stator winding nose and its fixed support structure. The ring-shaped lead (parallel ring) is the arc-shaped lead segment connecting the stator winding nose to the outgoing parallel block. The phase lead is the connection between the stator winding end ring-shaped lead and the stator coil. The main lead is the lead connecting the stator winding end ring-shaped lead to the outgoing bushing. For example... Figure 3 As shown, the measurement points for the end-wound overall modal vibration test are located on the conical cross-sections of the steam-side and excitation-side winding ends, with three circles on each side. Measurement points on each circle should be evenly distributed along the circumference. For a 2-pole generator, the number of measurement points should be at least 16, and for a 4-pole generator, at least 32. It is recommended to measure in the order of circles 1 to 3 (see the figure below). Typically, the mode of circle 1 is measured, where circle 1 is the circle formed by the measurement points at the nose joint of the stator winding end, circle 2 is the circle formed by the measurement points at the slot of the stator winding end, and circle 3 is the circle formed by the measurement points at the middle of the involute section of the stator winding end.

[0039] During new generator handover, major overhauls, short-circuit impacts, stator bar replacements, changes to the stator winding end fixing structure, or when necessary, dynamic characteristic measurements of the stator winding ends are required according to relevant procedures, specifications, and technical standards to check the tightness and wear of the stator winding ends. By identifying the modal parameters of the generator stator, vibration characteristic analysis, vibration fault diagnosis, and prediction can be provided for the generator stator. Specifically, the hammer impact method is used to measure the dynamic characteristics of the turbine generator stator winding ends.

[0040] See Figure 1 and Figure 2The present invention provides a generator stator winding end dynamic characteristic analyzer, including an analyzer body 1, an analysis terminal 2 connected to the analyzer body 1, and several interfaces provided on the analyzer body 1.

[0041] In one specific embodiment, the generator stator winding end dynamic characteristic analyzer further includes an acceleration sensor 3 and an impact hammer 4. The acceleration sensor 3 is mounted on the generator stator winding and electrically connected to the analyzer body 1 to measure and transmit acceleration data of the generator stator winding. The impact hammer 4 is electrically connected to the analyzer body 1 to transmit dynamic force data.

[0042] Specifically, the analyzer body 1 is the core data acquisition unit, with a built-in dynamic force sensor and acceleration signal receiving module. Its specific structure is the same as that of a conventional generator stator winding end dynamic characteristic analyzer, so its specific structure will not be described in detail here. The analyzer body 1 is connected to the analysis terminal 2, which can transmit the test data collected by the analyzer body to the analysis terminal for analysis and processing. The analysis terminal 2 receives the data transmitted by the analyzer body (such as the natural frequencies of the phase leads and main leads at the stator winding end, the overall elliptical mode or four-lobed mode shape of the stator winding end, and the response ratio corresponding to the natural frequencies of the frequency response functions of the stator winding end and the origin of the leads), and then analyzes the tightness and wear of the stator winding end based on the analysis results of the analysis terminal 2.

[0043] The analyzer body is connected to an impact hammer and an accelerometer, respectively, to effectively collect acceleration and dynamic force signals transmitted by the accelerometer and impact hammer. The impact hammer 4 strikes the designated measurement point on a wire bar, while the accelerometer measures its acceleration response. The force and acceleration signals are amplified and sent to the analyzer body for analysis, thereby obtaining the structure's frequency response function.

[0044] Furthermore, the aforementioned impact hammer 4 includes a hammer body 16, a hammer handle 22, a dynamic force sensor 15, a button assembly, and an LCD display 20. The hammer body 16 is electrically connected to the analyzer body 1 for impact measurement. The hammer handle 22 is mounted on the hammer body 16. The dynamic force sensor 15 is located at one end of the hammer body 16 to measure dynamic force data. The button assembly is located on the hammer handle 22 and / or the hammer body 16 to position the measured bar. The LCD display 20 is located on the hammer handle 22 and / or the hammer body 16, and is used to collect and display data from the dynamic force sensor 15.

[0045] Specifically, the impact hammer measures the impact force through its own body. A dynamic force sensor, located at one end of the hammer body, measures the dynamic force data, which is then transmitted to the analyzer. A button array is located on the hammer handle and / or the hammer body, facilitating the operator's positioning of the measured bar. An LCD screen, also located on the hammer handle and / or the hammer body, displays the data collected from the dynamic force sensor, allowing the operator to monitor the impact force in real time and thus control the impact intensity more precisely.

[0046] It should be noted that the button group has multiple buttons, which are connected to different interfaces of the switching module in the analysis terminal. This enables the switching of the displayed bars in the data receiving section of the analysis terminal. That is, the analysis terminal displays bars with different numbers at the beginning of the experiment. Different bars can be selected through the button group (such as previous or next). According to the displayed bar number, the corresponding bar number is pressed synchronously, thereby realizing the corresponding data recording.

[0047] If the striking force is not properly controlled and the test fails, the indicator for the bar will not change, but the screen will display an "Overload" or "Underload" warning. A successful strike will display "X**I" (Note: ** represents the bar number, and the Roman numerals represent the number of successful strikes; each bar is struck twice). The test continues, and after the bar test is complete, it will display "X**II". Switch to the next bar using the button group, and continue testing sequentially until all tests are finished. Turn off the program after the test is complete.

[0048] It should also be noted that if the operator of the impact hammer makes a mistake during the test and fails to strike the test bar, the analyzer will record incorrect data. The operator can switch to the next test bar using the button group and then retest the test bar using the button group. This allows the operator to easily adjust for any errors during the test.

[0049] The aforementioned generator stator winding end dynamic characteristic analyzer adds a force hammer test bar switching button and a force hammer screen display to the generator stator winding end dynamic characteristic analyzer, realizes the test bar positioning function during the test, and adds multi-dimensional confirmation function for operators during the test, ensuring that the test of each bar is supervised by every tester throughout the process. The overall design is reasonable and easy to use.

[0050] The test personnel operating the impact hammer can monitor the test situation in real time, ensuring that the test process and results are under their own control. The test tool is suitable for test scenarios that detect the natural frequency and vibration of the generator stator winding ends.

[0051] The following description, in conjunction with the accompanying drawings and specific embodiments, provides a more detailed introduction to the generator stator winding end dynamic characteristic analyzer provided by the present invention.

[0052] In one specific implementation, reference is made to... Figure 1 The interfaces include: USB connector 5, SMA connector 6, BNC connector 7, and aviation connector 8. USB connector 5 is located on the analyzer body 1 and is used to connect the analysis terminal 2 to the analyzer body 1. SMA connector 6 is located on the analyzer body 1 and is used to connect the acceleration sensor 3 to the analyzer body 1. BNC connector 7 is located on the analyzer body 1 and is electrically connected to the data acquisition module of the analyzer body 1. BNC connector 7 is used to connect the dynamic force sensor 15 to the analyzer body 1. Aviation connector 8 is located on the analyzer body 1 and is electrically connected to the control and display module of the analyzer body 1. Aviation connector 8 is used to connect the analyzer body 1 to the LCD screen 20 and the button group, respectively.

[0053] Specifically, the analyzer body 2 connects to the analysis terminal 2 via USB connector 5, to the acceleration sensor 3 via SMA connector 6, and to the impact hammer 4 via BNC connector 7 and aviation connector 8. BNC connector 7 connects the dynamic force sensor 15 of the impact hammer 4 to the data acquisition module of the analyzer body 2, and aviation connector 8 electrically connects the LCD display 20 and button group of the impact hammer 4 to the control and display module of the analyzer body 2, enabling the transmission of control signals and dynamic force detection signals from the impact hammer 4. The specific interface design provides a reliable physical connection method, avoiding signal interference or disconnection, ensuring the continuity and accuracy of data acquisition, simplifying equipment assembly and field deployment, and featuring strong interface compatibility, supporting quick plugging and unplugging, and reducing the risk of wiring errors.

[0054] Furthermore, the SMA connector connects to the accelerometer sensor via a coaxial cable to minimize signal loss, and the analyzer switch is waterproof to adapt to humid generator environments.

[0055] Furthermore, USB connector 5 uses the standard USB 2.0 or higher protocol, with a transmission rate of up to 480Mbps, ensuring real-time data synchronization; SMA connector 6 connects to the accelerometer sensor via a coaxial cable to minimize signal loss, and the analyzer switch features a waterproof design to adapt to humid generator environments.

[0056] Based on any of the above embodiments, refer to Figure 1A first transmission line 10 is connected between the USB connector 5 and the analysis terminal 2. The first transmission line 10 is a USB transmission line. A second transmission line 11 is connected between the SMA connector 6 and the accelerometer 3. The second transmission line 11 is an acceleration signal transmission line. A communication connector 21 is provided on one side of the hammer handle 22, which is electrically connected to the control and display module of the LCD screen 20 and the button group. A fourth transmission line 13 is connected between the communication connector 21 and the aviation connector 8. The fourth transmission line 13 is a hammer control and display signal transmission line. A dynamic force sensor force signal BNS connector 23 is provided at the end of the hammer handle 22, which is electrically connected to the data acquisition module in the dynamic force sensor 15. A third transmission line 12 is connected between the dynamic force sensor force signal BNS connector 23 and the BNC connector 7. The third transmission line 12 is a hammer force signal transmission line.

[0057] Specifically, the analysis terminal 2 and the analyzer body 1 are electrically connected via the first transmission line 10, the acceleration sensor 3 and the analyzer body 1 are electrically connected via the second transmission line 11, the dynamic force sensor 15 of the hammer handle 22 is electrically connected to the analyzer body 1 via the third transmission line 12, and the LCD display 20 and button group of the hammer handle 22 are electrically connected via the fourth transmission line 13, thereby achieving stable signal connection between the analyzer body 1 and each device.

[0058] Furthermore, the first transmission line uses a USB4 full-function data cable or a Thunderbolt 4 data cable, the second transmission line uses an M5-BNC low-noise coaxial cable, and the third transmission line uses a US PCB003D20 low-noise coaxial cable.

[0059] It should be noted that the dynamic force sensor is used to receive the force signal generated by striking the stator winding bars of the generator, and the acceleration sensor is used to receive the acceleration signal of the stator winding of the generator. The test personnel operating the impact hammer can switch the test bars autonomously during operation through the button on the impact hammer, and can monitor the real-time data acquisition status through the LCD screen on the impact hammer.

[0060] Based on any of the above embodiments, the fourth transmission line 13 is connected and transmitted using a 7-wire communication line with a 7-core aviation connector; two of the 7-core aviation connectors are the circuit power supply for the LCD screen 20 and the button group, with a power supply voltage of DC3.3V-5V; three of the cores are respectively connected to the three buttons of the button group; and the last two cores are SCL (IIC clock line) and SDA (IIC data line).

[0061] Specifically, the two pins provide circuit power to the LCD display 20 and the button group, while the three pins are connected to the three buttons of the button group, with each button occupying one pin independently to realize user input detection. The last two pins are SCL (IIC clock line) and SDA (IIC data line). The SDA line supports bidirectional data transmission, and the SCL line provides a synchronous clock with a rate of 100kHz (standard mode) or 400kHz (fast mode), which is suitable for low-speed peripheral control and is used for data transmission between the LCD display 20 and the main controller (such as MCU).

[0062] Furthermore, the 7-pin aviation connector has a plug diameter of 15mm and a contact hole diameter of 1mm. The 7-pin aviation connector's 7-wire communication line is used for the hammer control and display signal transmission line, enabling stable communication between the impact hammer and the control system. It supports bidirectional data transmission, enhancing reliability and durability. The aviation connector also has a high protection level, is dustproof and waterproof, suitable for harsh industrial environments, and reduces cable complexity.

[0063] In one specific implementation, reference is made to... Figure 2 The button group includes a first button 17 and a third button 19 arranged side by side on the hammer handle 22; the first button 17 is used to select the next measurement target; the third button 19 is used to select the previous measurement target. The button group uses a microcontroller with an ADC port to read the status of multiple buttons, and the operating voltage is DC3.3V-5V.

[0064] Specifically, during the experimental testing phase, the test bar is struck with an impact hammer. After two strike tests, the measurement target is switched to the next test bar via the third button 19, ensuring that the striking test bar always corresponds to the target test bar positioned by the equipment. If the striking force is incorrect and a re-measurement is required, the system first switches to the next test bar and then switches back to the original target test bar via the first button 19. This allows for the repositioning of the existing test bar and overwrites the original measurement data, preventing the impact of incorrect striking force on the measurement data and the positioning target. The button group's design allows operators to switch test bars independently, supporting forward, pause, and rewind operations. This addresses the adjustment needs in case of operational errors, improves testing flexibility, and the ADC port supports multi-button detection with fast response speed, enhancing operational efficiency.

[0065] Furthermore, the hammer grip 22 is also provided with a second button 18 and a fourth button. The second button is used to pause, and the fourth button is used to start. In some other embodiments, the fourth button may be the same as the first button, that is, the first button can be used to both start and pause.

[0066] It should be noted that each button is connected in series with a resistor of a different value, and then connected in parallel between the ADC pin and ground. When no button is pressed, the ADC pin may detect a high level (such as 3.3V or 5V) through the pull-up resistor. When different buttons are pressed, due to the voltage division effect, the ADC pin will detect different and specific voltage values. The microcontroller program can determine which button is pressed by reading the digital value converted by the ADC and determining which preset voltage range this value falls within. When the microcontroller detects that a button is pressed through the ADC, it will trigger the corresponding interrupt service routine or process it in the main loop and perform the corresponding operation according to the current state.

[0067] In one specific embodiment, the LCD screen 20 adopts a 0.96-inch IPS display with 4 pins and an operating voltage of DC3.3V-5V. The test equipment is based on the generator stator winding end dynamic characteristic analyzer, with the addition of a bar measurement switching control button and an LCD screen display, which makes it convenient for the test personnel operating the impact hammer to keep abreast of the test situation in real time and to independently control the test process.

[0068] Specifically, the display screen has a resolution of up to 128×64 pixels, supports the IIC communication protocol, and displays bar numbers (such as "X**" format, where ** is the number), the number of taps (in Roman numerals, such as I, II) and force warnings (such as "overload" or "too low").

[0069] Based on any of the above embodiments, the working surface of the dynamic force sensor 15 is provided with an impact hammer rubber head 14, which covers the sensor.

[0070] Specifically, an impact hammer rubber head is installed on the working surface of the dynamic force sensor to buffer the impact force, protect the sensor from excessive impact, and standardize the impact force to ensure data consistency, improve equipment life and test repeatability.

[0071] It should be noted that the rubber head is replaceable, which can adapt to different hardness requirements, reducing the risk of sensor damage and lowering maintenance costs.

[0072] See Figure 1 and Figure 2 This embodiment also discloses a method for using a generator stator winding end dynamic characteristic analyzer. This method is applied to the aforementioned generator stator winding end dynamic characteristic analyzer, and the method specifically includes the following steps: Step 1, Experimental Preparation Stage: Turn on the main body 1 of the analyzer and the analysis terminal 2, and connect the analysis terminal 2, the acceleration sensor 3 and the impact hammer 4 to the main body 1 of the analyzer respectively; Step 2, Experiment Start Stage: Input the number of stator winding bars of the generator under test into the testing software, generate the initial geometry, enter the admittance measurement interface, and start the test on the impact hammer. Step 3, Experimental Stage: The test personnel operating the impact hammer strike the stator bar corresponding to the bar number displayed on the hammer's display screen as "X**". Step 4: After the experiment, the experimenters will conduct an overall analysis of the experimental data and conduct retests for individual experimental data.

[0073] In this scenario, if the operator of the impact hammer makes a mistake and fails to strike the test bar, the analyzer records the erroneous data. Pressing the first button 17 switches to the next test bar, and then pressing the third button 19 restarts the test on the test bar. This allows the operator of the impact hammer to adjust for any errors made during the operation.

[0074] Furthermore, the analyzer logs error events but allows overwriting; the software includes an "undo" function that supports multi-level rollback to ensure data integrity.

[0075] Specifically, in step one, the analysis terminal 2 is connected to the analyzer body 1 via USB connector 5 and first transmission line 10; the acceleration sensor is connected to the analyzer body 1 via SMA connector 6 and second transmission line 11; the impact hammer 4 is connected to the analyzer body 1 via BNC interface connector 7, third transmission line 12 and dynamic force sensor force signal connector 23 to transmit force signals; and the impact hammer 4 is connected to the analyzer body 1 via 7-pin aviation plug connector 8, fourth transmission line 13 and communication connector 21 to transmit control and display signals.

[0076] Furthermore, an analyzer switch 9 is installed on the analyzer body 1. Before conducting the experiment, the analyzer switch 9 is turned on to confirm that the equipment is working properly and the LCD screen of the impact hammer is displaying normally.

[0077] Specifically, in step two, the test is started by pressing the first button 17 on the impact hammer, selecting to start the test from number 1, or by selecting the stator winding bar under test through the analysis software on the analysis terminal 2 and clicking start.

[0078] Specifically, in step three, if the striking force control fails, the display bar section will not change, and an "overload" or "underload" warning will appear on the screen; if the striking is successful, it will display "X**I" and continue the test. After the bar test is completed, it will display "X**II", and you can switch to the next bar by using the button group (first button 17) on the impact hammer. This process is repeated until all tests are completed. After the test is completed, the impact hammer is turned off.

[0079] Furthermore, the impact hammer is equipped with a second button 18, which is an on / off button, allowing the impact hammer to be turned on and off.

[0080] Specifically, in step four, the bar to be retested is selected on the testing software, the corresponding bar number is displayed on the impact hammer screen, and the tester operating the impact hammer performs the retest on the bar according to the screen prompts.

[0081] The above-mentioned method for using a generator stator winding end dynamic characteristic analyzer adds control buttons and an LCD screen to the impact hammer in the generator stator winding end dynamic characteristic analyzer, enabling the test personnel to control the hammer independently during the test, meeting the usage requirements, with clear steps and easy training; it supports retesting and adjustment, improving the integrity and accuracy of the test.

[0082] In one specific embodiment of this method of use, during the experimental phase, the bar number on the hammer display screen is “X**I”, where ** represents the bar number and the Roman numeral represents the number of successful strikes.

[0083] Specifically, each bar needs to be tapped twice. A successful tap displays "I", and a successful tap displays "II". The testing software can generate a bar layout diagram to assist in visual positioning.

[0084] It should be noted that, to avoid misunderstandings and ensure operators accurately identify test status, the consistency of the user interface is enhanced, information interpretation is simplified, and training time is reduced; Roman numerals intuitively display progress, improving readability.

[0085] Furthermore, the retesting steps include: selecting the bar to be retested using the testing software, displaying the corresponding bar number on the LCD screen 20, and the operator performing the retest according to the displayed bar number.

[0086] The specific implementation steps of this embodiment are as follows: During the test preparation phase, the analyzer and laptop were connected via USB interface data cable. An accelerometer was installed on the generator stator winding. An SMA connector communication cable was used to connect the analyzer and the accelerometer. The force signal from the impact hammer was connected to the analyzer via a BNC connector communication cable. The control and display signals of the impact hammer were connected to the analyzer via a 7-pin 7-wire aviation connector communication cable. The analyzer power switch was turned on and off. After the analyzer was powered on, it was confirmed that the equipment was working normally and the display on the impact hammer was normal. The number of stator winding bars of the generator under test was entered into the test software to generate the initial geometry, and then the admittance measurement interface was entered.

[0087] At the start of the test, the test can be started by pressing the first button 17 on the impact hammer 4. The impact hammer 4 can only start the test from number 1. Alternatively, the test can be started by selecting the stator winding bar under test on the analysis software and then clicking start.

[0088] After the test begins, the operator of the impact hammer 4 strikes the stator bar corresponding to the bar number displayed on the LCD screen 20 ("X**"). If the striking force is not controlled properly and the test fails, the bar number will not change, but the screen will display an "overload" or "underload" warning. If the strike is successful, it will display "X** I" ("X**" represents the bar number, and the Roman numeral represents the number of successful strikes; each bar is struck twice). The test continues until all bars are tested, at which point "X** II" will be displayed. The operator then presses the first button 17 on the impact hammer 4 to switch to the next bar, and so on, until the test is completed. After the test, the operator presses the second button 18.

[0089] If, during the test, the operator of the impact hammer makes a mistake and fails to strike the test bar, the analyzer body 1 records the erroneous data. The operator can press the first button 17 to switch to the next test bar, and then press the third button 19 to retest the test bar. This allows the operator of the impact hammer 4 to adjust for any errors made during the test.

[0090] After the test introduction, the test data analysis personnel will conduct an overall analysis of the test data. If retesting is required for individual test data, the personnel can select the bar to be retested on the test software. The impact hammer screen will display the corresponding bar number, and the test personnel operating the impact hammer can retest the bar according to the on-screen prompts.

[0091] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A generator stator winding end dynamic analyzer, comprising an analyzer body (1), an analysis terminal (2) connected to the analyzer body (1), and a plurality of interfaces provided on the analyzer body (1); Its features are, Also includes: An acceleration sensor (3) is installed on the generator stator winding. The acceleration sensor (3) is electrically connected to the analyzer body (1) to measure and transmit the acceleration data of the generator stator winding. Impact hammer (4), which is electrically connected to the analyzer body (1) to transmit dynamic force data; The impact hammer (4) includes: The hammer body (16) is electrically connected to the analyzer body (1) to perform hammer impact measurement; A hammer handle (22) is provided on the hammer body (16); A dynamic force sensor (15) is provided at one end of the hammer body (16) to measure dynamic force data; A button assembly, which is located on the hammer handle (22) and / or the hammer body (16), for positioning the measured bar; The liquid crystal display screen (20) is disposed on the hammer handle (22) and / or the hammer body (16), and the liquid crystal display screen (20) is used to collect and display the data of the dynamic force sensor (15).

2. The generator stator winding end dynamic analyzer according to claim 1, characterized in that, The interface includes: USB connector (5), the USB connector (5) is provided on the analyzer body (1), the USB connector (5) is used to connect the analysis terminal (2) and the analyzer body (1). SMA connector (6), the SMA connector (6) is provided on the analyzer body (1), the SMA connector (6) is used to connect the acceleration sensor (3) and the analyzer body (1). BNC connector (7), the BNC connector (7) is provided on the analyzer body (1), the BNC connector (7) is electrically connected to the data acquisition module of the analyzer body (1), and the BNC connector (7) is used to connect the dynamic force sensor (15) and the analyzer body (1). Aviation connector (8), the aviation connector (8) is provided on the analyzer body (1), the aviation connector (8) is electrically connected to the control and display module of the analyzer body (1), the aviation connector (8) is used to connect the analyzer body (1) to the liquid crystal display screen (20) and the button group respectively.

3. The generator stator winding end dynamic analyzer according to claim 2, characterized in that, A first transmission line (10) is connected between the USB connector (5) and the analysis terminal (2). A second transmission line (11) is connected between the SMA connector (6) and the accelerometer (3). A communication connector (21) is provided on one side of the hammer handle (22), which is electrically connected to the control and display module of the LCD screen (20) and the button group. A fourth transmission line (13) is connected between the communication connector (21) and the aviation connector (8). The end of the hammer handle (22) is provided with a dynamic force sensor force signal BNS connector (23), which is electrically connected to the data acquisition module in the dynamic force sensor (15). A third transmission line (12) is connected between the dynamic force sensor force signal BNS connector (23) and the BNC connector (7).

4. A generator stator winding end dynamic analyzer according to claim 3, characterized in that, The fourth transmission line (13) is connected to the transmission line using a (7)-core aviation connector (7)-wire communication line.

5. A generator stator winding end dynamic analyzer according to claim 1, characterized in that, The button group includes a first button (17) and a third button (19) arranged side by side on the hammer grip (22). The first button (17) is used to select the next measurement target; The third button (19) is used to select the previous measurement target; The button group uses a microcontroller with an ADC port to read the status of multiple buttons.

6. The generator stator winding end dynamic analyzer according to claim 1, characterized in that, The liquid crystal display (20) is a 4-pin IPS display.

7. A generator stator winding end dynamic analyzer according to claim 1, characterized in that, The working surface of the dynamic force sensor (15) is provided with an impact hammer rubber head (14), which covers the dynamic force sensor (15).

8. A method for using a generator stator winding end dynamic characteristic analyzer, characterized in that, The method of using the generator stator winding end dynamic characteristic analyzer as described in any one of claims 1-7 includes: Experimental preparation stage: Turn on the main body of the analyzer (1) and the analysis terminal (2), and connect the analysis terminal (2), the acceleration sensor (3) and the impact hammer (4) to the main body of the analyzer (1) respectively; Experimental start phase: Input the number of stator winding bars of the generator under test into the testing software to generate the initial geometry, enter the admittance measurement interface, and start the test on the impact hammer; Experimental phase: The test personnel operating the impact hammer strike the stator bars with the corresponding numbers according to the bar numbers on the hammer display screen; After the experiment: The experimenters who analyze the experimental data conduct an overall analysis of the experimental data, and some individual experimental data need to be retested; In this system, if the operator of the impact hammer makes a mistake and fails to strike the test bar, the analyzer records the erroneous data. The operator can then adjust the button group, switch to the next test bar, and return to retest the test bar. This allows the operator to easily correct any errors made during the operation.

9. The method of using a generator stator winding end dynamic characteristic analyzer according to claim 8, characterized in that, During the experiment, the bar number on the hammer display screen is "X**I", where ** represents the bar number and the Roman numeral represents the number of successful strikes.

10. The method of using a generator stator winding end dynamic characteristic analyzer according to claim 8, characterized in that, The retesting steps include: selecting the bar to be retested using the testing software, the LCD screen (20) displays the corresponding bar number, and the operator performs the retesting according to the displayed bar number.

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