Electromagnetic performance testing device and method for long stator

Abstract

This invention discloses an electromagnetic performance testing device and method for long stators. A long stator mounting device is set up to generate a long stator gap simulating the actual splicing state of a track, making the testing environment close to actual operating conditions. A gap measuring device is set up under the long stator mounting device, and a motion control device moves the gap measuring device relative to the length of the long stator under test, continuously collecting suspension gap data. The measurement and control device divides the suspension gap data into periods based on the toothed structure of the long stator under test, and calculates evaluation parameters in units of toothed periods to evaluate the electromagnetic performance of the long stator. This invention solves the technical problems in the prior art, such as the difficulty in continuously evaluating the electromagnetic performance of long stators under simulated actual splicing conditions, the lack of effective testing methods for the electromagnetic performance of long stators, and the inability to guarantee the consistency of performance of long stators from different batches or manufacturers, thus achieving the technical effect of improving the accuracy of long stator electromagnetic performance testing.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic performance testing, and particularly to an electromagnetic performance testing device and method for a long stator. Background Technology

[0002] In conventional high-speed maglev systems, trains achieve stable levitation through closed-loop control of the suspension gap. The electromagnetic performance of the long stator directly affects the measurement and control of the suspension gap. Due to inconsistent electromagnetic performance evaluation standards among long stators produced by different suppliers, problems such as vibration, gap measurement errors, and even train stoppages occur when the train travels on mixed tracks. Current technology lacks effective testing methods for the electromagnetic performance of long stators, making it impossible to guarantee the consistency of performance between different batches or manufacturers of long stators. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic performance testing device and method for long stators, which solves the technical problems in the prior art of making it difficult to continuously evaluate the electromagnetic performance of long stators under simulated actual splicing conditions, lacking effective testing methods for the electromagnetic performance of long stators, and failing to guarantee the consistency of performance of long stators from different batches or different manufacturers, thereby achieving the technical effect of improving the accuracy of electromagnetic performance testing of long stators.

[0004] In a first aspect, the present invention provides an electromagnetic performance testing device for a long stator, comprising: A long stator mounting device is used to mount the long stator to be tested and generate a long stator gap for simulating the track splicing state; A gap measuring device is disposed below the long stator mounting device and is used to collect suspension gap data during relative motion with the long stator to be measured. A motion control device, connected to the gap measuring device, is used to drive the gap measuring device to move along the length direction of the long stator to be measured, and to adjust the suspension gap between the gap measuring device and the long stator to be measured. The measurement and control device is connected to the gap measuring device and the motion control device respectively. It is used to divide the collected suspension gap data into periods according to the tooth groove structure of the long stator to be measured during the movement of the gap measuring device along the long stator to be measured, and to calculate the evaluation parameters based on the suspension gap data in units of tooth groove period, and to determine the electromagnetic performance of the long stator to be measured based on the evaluation parameters.

[0005] Optionally, the long stator mounting device includes auxiliary long stators disposed on both sides of the long stator to be tested, forming two long stator gaps with the long stator to be tested, so as to simulate the long stator gaps in the track splicing state.

[0006] Optionally, the auxiliary long stator is fixedly installed on the test fixture, and the long stator to be tested is detachably installed on the test fixture; The installation position of the auxiliary long stator is provided with an adjustment structure for adjusting the gap between the auxiliary long stator and the long stator to be tested.

[0007] Optionally, the long stator mounting device includes a guiding and positioning structure and a height adjustment structure; The guiding and positioning structure is used to mate with the mounting hole of the dovetail key of the stator to be measured for positioning. The height adjustment structure is used to adjust the installation height of the stator to be measured.

[0008] Optionally, the gap measuring device includes a suspended gap sensor and a calibration sensor. The suspension gap sensor is used to collect suspension gap data between the length stator to be measured and the suspension gap sensor; The verification sensor is used to verify the suspension gap data.

[0009] Optionally, the suspension gap sensor is a multi-channel suspension gap sensor, used to simultaneously acquire suspension gap data from multiple channels.

[0010] Optionally, the verification sensor is a laser displacement sensor, used to collect gap data between the long stator to be tested and the laser displacement sensor, and to verify the suspension gap data collected by the suspension gap sensor based on the gap data.

[0011] Optionally, the suspension gap sensor is mounted on a sensor mounting fixture, which is connected to the motion control device through a multi-point fixing structure.

[0012] Optionally, the motion control device includes a first motion mechanism arranged along the length direction of the stator to be measured and a second motion mechanism arranged along the height direction of the stator to be measured. The first motion mechanism is used to drive the gap measuring device to move along the length direction of the stator to be measured; The second motion mechanism is used to adjust the suspension gap between the gap measuring device and the long stator to be measured.

[0013] Optionally, it also includes an information acquisition device and a thickness detection device; The information acquisition device is used to acquire the identification information of the stator under test. The thickness detection device is used to measure the resin thickness of the long stator after casting.

[0014] Optionally, the information acquisition device is a barcode scanner, and the thickness detection device is a resin thickness gauge.

[0015] Optionally, it also includes a long stator hoisting device, which includes a clamping structure for holding the dovetail key structure of the long stator to be tested.

[0016] Optionally, the clamping structure is a gripper, which engages with the I-shaped cross-section of the dovetail key of the stator to be measured for clamping.

[0017] Optionally, the clamping structure is driven by a pneumatic actuator and controlled by a solenoid valve.

[0018] Optionally, the solenoid valve is an air shortage holding solenoid valve, used to maintain the current state when the air or electrical circuit is disconnected.

[0019] Secondly, the present invention provides a method for testing the electromagnetic performance of a long stator, applied to the electromagnetic performance testing device for the long stator described above, the method comprising: Install the stator to be tested and set the test gap; The control gap measuring device moves along the length of the long stator and collects suspension gap data; The collected suspension gap data is periodically divided based on the tooth groove structure of the long stator to be tested; Evaluation parameters are calculated based on the collected suspension gap data, using the tooth groove cycle as the unit, and the electromagnetic performance of the long stator under test is determined based on the evaluation parameters.

[0020] Optionally, the gap measuring device includes a suspension gap sensor for acquiring suspension gap data between the long stator under test and the suspension gap sensor, and a verification sensor for verifying the suspension gap data; the electromagnetic performance testing method for the long stator further includes: The average value of the suspension gap data measured by the suspension gap sensor is compared with the average value of the gap data measured by the calibration sensor. When the deviation between the two average values ​​is within a preset range, the suspension gap sensor is determined to be working normally.

[0021] Optionally, after installing the long stator to be tested and setting the test gap, and before controlling the gap measuring device to move along the length of the long stator, the method further includes: The gap data corresponding to the test gap is collected by the calibration sensor to determine whether the installation level of the long stator under test meets the preset requirements, and adjustments are made when the installation level does not meet the preset requirements.

[0022] Optionally, gap data corresponding to the test gap is collected by a calibration sensor to determine whether the installation level of the stator under test meets the preset requirements, including: If the difference in the minimum value measured by a single calibration sensor within different tooth groove cycles at different positions of the long stator to be tested does not exceed a preset threshold, and the difference in the real-time gap between at least two calibration sensors does not exceed a preset threshold, then the installation level of the long stator to be tested is determined to meet the preset requirements.

[0023] Optionally, the gap measuring device includes a suspended gap sensor, and the suspended gap sensor is a dual-channel gap sensor. It calculates evaluation parameters based on the collected suspended gap data, using the tooth groove cycle as the unit, and determines the electromagnetic performance of the long stator under test based on the evaluation parameters, including: The suspended gap data collected in each tooth groove cycle is processed to calculate the arithmetic mean of all suspended gap data in the tooth groove cycle to obtain the corresponding suspended gap average value. The suspended gap average value is then compared with the actual electromagnetic gap value to calculate the first difference between the two and to determine whether the first difference is within the specified range. Determine the maximum and minimum suspension gap values ​​from the suspension gap data corresponding to the tooth groove cycle, calculate the second difference between the maximum suspension gap value and the average suspension gap value, and the third difference between the minimum suspension gap value and the average suspension gap value, and determine whether the second difference and the third difference are both within the specified range. Two suspension gap data from the suspension gap sensor are acquired respectively, and a fourth difference between the two suspension gap data is calculated to determine whether the fourth difference is within the specified range. When all evaluation results meet the corresponding specified range, the electromagnetic performance at the position corresponding to the tooth groove cycle is deemed to meet the requirements.

[0024] Optionally, the collected suspension gap data can be periodically divided according to the tooth groove structure of the long stator under test, including: Based on the sampling frequency of the suspended gap sensor in the gap measuring device and the relative motion speed between the gap measuring device and the long stator to be measured, the number of data points collected when the gap measuring device moves the distance between one tooth and one slot is calculated. Starting from the first tooth of the long stator to be tested, all the suspended gap data collected within the distance range of each tooth and slot moved by the gap measuring device are collected into a data set of one tooth slot cycle.

[0025] This invention provides an electromagnetic performance testing device and method for long stators. A long stator mounting device is set up to mount the long stator under test and generate a gap simulating the actual splicing state of a track, making the testing environment closer to the working state of the long stator in actual application scenarios. A gap measuring device is set under the long stator mounting device and, driven by a motion control device, moves relative to the length of the long stator under test. During the movement, the suspension gap data between the long stator under test and the sensor is continuously collected. The measurement and control device divides the collected suspension gap data into periods based on the toothed structure of the long stator under test and calculates evaluation parameters in units of toothed period, thereby evaluating the electromagnetic performance of the long stator. This invention solves the technical problems in the prior art, such as the difficulty in continuously evaluating the electromagnetic performance of long stators under simulated actual splicing conditions, the lack of effective testing methods for the electromagnetic performance of long stators, and the inability to guarantee the consistency of performance of long stators from different batches or manufacturers, thus achieving the technical effect of improving the accuracy of electromagnetic performance testing of long stators. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic block diagram of an electromagnetic performance testing device for a long stator provided by the present invention; Figure 2 A relative position diagram of a long stator and a sensor provided by the present invention; Figure 3 A schematic diagram of a test fixture for a long stator provided by the present invention; Figure 4 A schematic diagram of another test fixture for a long stator provided by the present invention; Figure 5 A schematic diagram of a fixture for a suspension gap sensor provided by the present invention; Figure 6 This is a schematic diagram of a lifting device for a long stator provided by the present invention; Figure 7 A flowchart of a method for testing the electromagnetic properties of a long stator provided by the present invention; Figure 8 A system block diagram of an electromagnetic performance testing device for a long stator provided by the present invention; Figure 9 The flowchart shows an electromagnetic performance testing system for a long stator provided by the present invention. Detailed Implementation

[0028] The core of this invention is to provide an electromagnetic performance testing device and method for long stators, which solves the technical problems in the prior art of making it difficult to continuously evaluate the electromagnetic performance of long stators under simulated actual splicing conditions, lacking effective testing methods for the electromagnetic performance of long stators, and failing to guarantee the consistency of performance of long stators from different batches or different manufacturers, thus achieving the technical effect of improving the accuracy of electromagnetic performance testing of long stators.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0030] like Figure 1 In a first aspect, the present invention provides an electromagnetic performance testing device for a long stator, comprising: The long stator mounting device 11 is used to mount the long stator to be tested and generate a long stator gap for simulating the track splicing state. The gap measuring device 12 is located below the long stator mounting device 11 and is used to collect suspension gap data during relative motion with the long stator to be measured. The motion control device 13 is connected to the gap measuring device 12 and is used to drive the gap measuring device 12 to move along the length direction of the long stator to be measured, and to adjust the suspension gap between the gap measuring device 12 and the long stator to be measured. The measurement and control device 14 is connected to the gap measuring device 12 and the motion control device 13 respectively. It is used to divide the collected suspension gap data into periods according to the tooth groove structure of the long stator to be measured during the movement of the gap measuring device 12 along the long stator to be measured, and to calculate the evaluation parameters based on the suspension gap data in units of tooth groove period, and to determine the electromagnetic performance of the long stator to be measured based on the evaluation parameters.

[0031] The electromagnetic performance testing device for long stators provided in this embodiment is based on the principle of continuously measuring the changes in the suspension gap of the long stator under test in a structural environment close to actual operating conditions, and analyzing the regularity of the measurement data according to the toothed structure to indirectly reflect the electromagnetic performance of the long stator. In practical applications, long stators are usually installed in the track structure, and there are splicing gaps between adjacent long stators. This splicing state will affect the electromagnetic interaction. In this embodiment, the long stator installation device 11 is used to install the long stator under test, and at the same time, a long stator gap simulating the splicing state of the track is formed in the structure, so that the test state is close to the actual working state of the long stator in the track. Testing under these conditions can be used, but is not limited to, for factory inspection, pre-installation inspection, or maintenance inspection of long stators in maglev tracks.

[0032] During the test, the gap measuring device 12 is positioned below the long stator mounting device 11, forming a certain suspension gap with the long stator under test. When the device is running, relative motion occurs between the gap measuring device 12 and the long stator under test, and the gap measuring device 12 continuously collects the suspension gap data between them. In this embodiment, the suspension gap data reflects the real-time distance change from the sensor to the surface of the long stator. This distance change is related to the electromagnetic attraction distribution and the tooth and slot structure of the long stator. For example, at locations where the teeth and slots of the long stator are alternately distributed, the magnetic field distribution typically exhibits periodic changes. This change is reflected in the suspension gap data, causing the measured data to show certain periodic fluctuation characteristics.

[0033] The motion control device 13 is used to control the motion of the gap measuring device 12. In this embodiment, the motion control device 13 can, but is not limited to, use a linear motion mechanism to drive the gap measuring device 12 to move along the length of the long stator to be measured, so that the gap measuring device 12 can perform scanning measurements along the entire length of the long stator. Simultaneously, the motion control device 13 can also adjust the suspension gap between the gap measuring device 12 and the long stator to be measured, for example, by adjusting the height position of the gap measuring device 12, so that the sensor remains within the set test gap range. In this way, stable measurement conditions can be maintained throughout the test, making the test data from different locations comparable.

[0034] In terms of data processing, the measurement and control device 14 analyzes the suspension gap data collected by the gap measuring device 12. In this embodiment, the long stator under test has a periodic tooth and groove structure, so the suspension gap data also exhibits periodic variation characteristics in space. The measurement and control device 14 divides the collected suspension gap data into periods according to the tooth and groove structure of the long stator under test, for example, grouping the data within the distance range corresponding to one tooth and one groove into one tooth and groove period. In this way, continuously collected data can be converted into several data units with clear physical meaning, and the data of each tooth and groove period can reflect the electromagnetic interaction characteristics of the corresponding position.

[0035] After completing the period division, the measurement and control device 14 further calculates evaluation parameters based on the suspension gap data. In this embodiment, the evaluation parameters may include, but are not limited to, the average, maximum, minimum, or data fluctuation amplitude of the suspension gap data within the tooth groove period. These parameters can reflect the electromagnetic characteristics of the long stator at the corresponding position. When the evaluation parameters at different positions show significant deviations, it often means that there are differences in the electromagnetic structure at that position, such as tooth groove machining deviations, material differences, or structural assembly errors. By analyzing the evaluation parameters of multiple tooth groove periods, the overall electromagnetic performance of the long stator under test can be judged, and it can be determined whether the electromagnetic performance of the long stator under test meets the design requirements.

[0036] In one exemplary embodiment, the long stator mounting device 11 includes auxiliary long stators disposed on both sides of the long stator to be tested, forming two long stator gaps with the long stator to be tested, so as to simulate the long stator gap in the track splicing state.

[0037] In this embodiment, the long stator mounting device 11 sets auxiliary long stators on both sides of the long stator to be tested, creating two long stator gaps between the long stator to be tested and the auxiliary long stators on both sides. In actual engineering applications, long stators are usually laid on the track structure in segments, and there are splicing positions between adjacent long stators, which often form structural gaps of a certain size. In this embodiment, by arranging auxiliary long stators, the long stator to be tested is placed in a structural environment similar to the actual track laying state, that is, the long stator to be tested is spliced ​​with adjacent long stators at both ends. Through this arrangement, the splicing state of the long stator in the track can be simulated during the testing phase, making the stress state and electromagnetic interaction state of the long stator to be tested close to the actual operating conditions.

[0038] The auxiliary long stator can be, but is not limited to, a half-long stator component with the same or similar structure as the long stator under test, and its installation position is aligned with the long stator under test in the length direction. In this way, two long stator gaps are formed at both ends of the long stator under test. The gap size can be set according to the actual splicing gap in the track engineering, for example, a certain range of gap distance can be set according to engineering standards or test requirements. When the gap measuring device 12 moves along the length direction of the long stator under test and collects the suspension gap data, the suspension gap data near the two ends of the long stator will be affected by the splicing structure of the long stator, thus reflecting the changes in electromagnetic characteristics near the splicing area.

[0039] Furthermore, by setting auxiliary long stators on both sides of the long stator under test, the structural boundary conditions of the long stator under test can be made more stable in the installed state. If only a single long stator under test is tested, its two ends may be in a free boundary state, while long stators in actual tracks are usually connected to adjacent structures. In this embodiment, by setting auxiliary long stators, the long stators under test are arranged in a continuous state in the structure. This arrangement can be used, but is not limited to, to simulate the situation where multiple long stators are laid continuously in an actual track. Under this structural condition, the data acquisition of the suspension gap can more realistically reflect the electromagnetic performance distribution of the long stator in the actual application environment.

[0040] like Figure 2 and Figure 3 In one exemplary embodiment, the auxiliary long stator is fixedly mounted on the test fixture 23, and the long stator to be tested is detachably mounted on the test fixture 23. The installation position of the auxiliary long stator is equipped with an adjustment structure to adjust the gap between the auxiliary long stator and the long stator to be tested.

[0041] In this embodiment, the auxiliary long stator is fixedly mounted on the test fixture 23, while the long stator under test is detachably mounted on the test fixture 23. This mounting method ensures that the testing device maintains structural consistency when testing different long stators. The auxiliary long stator serves as a reference structure simulating the track assembly state, and its position remains unchanged during testing, thus serving as a fixed reference in the testing environment. The long stator under test is mounted on the test fixture 23 before testing and can be disassembled and replaced with a new long stator after testing. This method is applicable, but not limited to, batch production testing or repeated laboratory testing scenarios, ensuring that the structural environment remains essentially consistent for each test.

[0042] In practical implementation, the auxiliary long stator can be installed on the test fixture 23 through bolt connection, pressure plate fixation, or positioning pin engagement, ensuring the auxiliary long stator maintains a stable position during testing. In this embodiment, the long stator under test adopts a detachable installation method, such as installation through mounting slots, clamping structures, or positioning structures on the fixture, ensuring the long stator under test remains stable after installation and can be easily disassembled after testing. This combination of fixed and detachable installation methods allows for rapid replacement of the long stator under test while maintaining the stability of the auxiliary long stator.

[0043] In addition, this embodiment includes an adjustment structure at the mounting position of the auxiliary long stator to adjust the gap between the auxiliary long stator and the long stator to be tested. The adjustment structure can, but is not limited to, using an adjusting screw, a sliding guide rail, and a locking structure (such as...). Figure 5 The device utilizes adjustable structures such as shims or movable mounting bases to create a predetermined gap between the auxiliary long stator and the long stator under test by altering the installation position of the auxiliary long stator. In practical applications, the splicing gap may vary depending on the track engineering or testing requirements. The adjustable structure allows for setting and fine-tuning of this gap, ensuring the resulting long stator gap meets the corresponding testing conditions. This embodiment, through this adjustable structure, enables the testing device to adapt to testing scenarios with different gap requirements while maintaining a stable relative position between the long stator under test and the auxiliary long stator.

[0044] like Figure 4 In one exemplary embodiment, the long stator mounting device 11 includes a guiding and positioning structure and a height adjustment structure; The guiding and positioning structure is used to mate with the mounting holes of the dovetail key of the stator to be measured for positioning. The height adjustment structure is used to adjust the installation height of the long stator to be measured.

[0045] In this embodiment, the long stator mounting device 11 includes a guiding and positioning structure and a height adjustment structure, used to constrain and adjust the position of the long stator to be tested during installation. In actual engineering, the long stator is usually connected to the track foundation via a dovetail key structure, and there is a clear assembly relationship between its installation position and the dovetail key structure. In this embodiment, a guiding and positioning structure is provided on the long stator mounting device 11, and this guiding and positioning structure is matched with the mounting hole of the dovetail key of the long stator to be tested, so that the long stator to be tested can quickly enter the predetermined position during installation. Through this structural relationship, the position of the long stator to be tested in the horizontal plane can be restricted, so that it maintains a stable position in the length direction and the lateral direction.

[0046] In this embodiment, the guiding and positioning structure can be, but is not limited to, a positioning pin, a guide post, or a mating block. These structures form a mating relationship with the dovetail key mounting holes of the long stator to be tested. When the long stator to be tested is placed on the long stator mounting device 11, the mounting holes of the dovetail key gradually align with and fit into the guiding and positioning structure, allowing the long stator to be tested to automatically complete positional alignment during installation. In this way, the process of manually adjusting the position can be reduced, ensuring that the long stator to be tested maintains a consistent positioning reference during installation. Furthermore, since the dovetail key structure itself has high machining precision in the long stator structure, using this structure as a positioning reference ensures that the installation position of the long stator to be tested remains consistent during each test.

[0047] In the vertical direction, this embodiment adjusts the installation height of the long stator under test using a height adjustment structure. The height adjustment structure can be, but is not limited to, an adjusting screw structure, an adjustable pad structure, or a lifting support structure. By changing the height of the support position, the installation height of the long stator under test in the vertical direction changes. During actual testing, a certain suspension gap needs to be maintained between the gap measuring device 12 and the long stator under test; therefore, the installation height of the long stator under test needs to be adjusted appropriately. This embodiment, through the height adjustment structure, allows for fine height adjustments of the long stator under test after installation, ensuring a predetermined suspension gap condition between it and the gap measuring device 12.

[0048] like Figure 2 and Figure 5 In one exemplary embodiment, the gap measuring device 12 includes a suspended gap sensor 21 and a verification sensor 22. The suspension gap sensor 21 is used to collect the suspension gap data between the long stator to be measured and the suspension gap sensor 21; The calibration sensor 22 is used to calibrate the suspension gap data.

[0049] In this embodiment, the gap measuring device 12 includes a suspended gap sensor 21 and a verification sensor 22, used to acquire suspended gap data and verify the data during the movement of the gap measuring device 12 along the length direction of the long stator to be measured. The gap measuring device 12 is located below the long stator mounting device 11. When the motion control device 13 drives the gap measuring device 12 to move along the length direction of the long stator to be measured, the suspended gap sensor 21 continuously detects the change in distance between itself and the long stator to be measured. In this embodiment, this distance is the suspended gap, and its change corresponds to the tooth groove structure and electromagnetic effect distribution of the long stator to be measured. By continuously acquiring suspended gap data during the movement, a suspended gap change curve along the entire length of the long stator to be measured can be obtained. This data can then be divided according to the tooth groove period by the measurement and control device 14 and used for electromagnetic performance evaluation.

[0050] In practical implementation, the levitation gap sensor 21 can be, but is not limited to, an inductive displacement sensor, an eddy current displacement sensor, or other sensor types capable of non-contact distance measurement. In this embodiment, the levitation gap sensor 21 continuously outputs a distance measurement signal during the movement of the gap measuring device 12, enabling the measurement and control device 14 to acquire the levitation gap data between the surface of the long stator to be measured and the sensor in real time. When the gap measuring device 12 moves through different tooth groove positions, the structural changes and magnetic field changes on the surface of the long stator to be measured will be reflected as periodic fluctuations in the levitation gap data. Therefore, these data can reflect the electromagnetic effects at different positions of the long stator to be measured.

[0051] To verify the suspension gap data, this embodiment also includes a calibration sensor 22 in the gap measuring device 12. The calibration sensor 22 acquires gap data at the position corresponding to the suspension gap sensor 21 during the test and compares it with the data acquired by the suspension gap sensor 21. The calibration sensor 22 can be, but is not limited to, installed near the suspension gap sensor 21, allowing it to detect the distance to the long stator under test at the same position when the gap measuring device 12 moves. During the test, if the suspension gap data measured by the suspension gap sensor 21 and the gap data measured by the calibration sensor 22 remain within a reasonable range, the suspension gap sensor 21 can be considered to be in normal working condition; if there is a significant deviation between the two, it indicates a measurement error or sensor malfunction. This embodiment, by setting up the calibration sensor 22, provides a basis for verification during the acquisition of suspension gap data, enabling the measurement and control device 14 to perform evaluation based on more reliable data when conducting tooth groove period analysis.

[0052] In one exemplary embodiment, the suspension gap sensor 21 is a multi-channel suspension gap sensor 21, used to synchronously acquire suspension gap data from multiple channels.

[0053] In this embodiment, the suspension gap sensor 21 is a multi-channel suspension gap sensor 21, which can simultaneously acquire multi-channel suspension gap data during the movement of the gap measuring device 12 along the length direction of the long stator to be measured. Driven by the motion control device 13, the gap measuring device 12 moves relative to the long stator to be measured. During this movement, the suspension gap sensor 21 continuously detects the change in distance between itself and the long stator. When using a multi-channel suspension gap sensor 21, different channels can simultaneously measure different positions on the surface of the long stator to be measured. For example, multiple measuring points can be arranged at lateral intervals, allowing multiple measuring channels to acquire suspension gap data at corresponding positions at the same time. Thus, as the gap measuring device 12 moves along the length direction, each channel forms a suspension gap data sequence that changes with position. The measurement and control device 14 can then periodically divide the data of each channel according to the tooth structure of the long stator to be measured and analyze it in units of tooth period.

[0054] In a specific implementation, the multi-channel suspension gap sensor 21 may, but is not limited to, consist of multiple independent measurement channels. These channels are mounted on the same sensor structure or at adjacent positions, enabling each channel to synchronously output suspension gap data during the same movement. In this embodiment, the gap measuring device 12 acquires suspension gap changes at multiple locations simultaneously during a single scan, for example, generating multiple measurement data at different lateral positions or different local areas of the long stator under test. After dividing the data into cogging cycles, the measurement and control device 14 can compare and analyze the data corresponding to each channel to observe the consistency or differences in suspension gap changes at different positions. These data can reflect the electromagnetic characteristics of the long stator under test in spatial distribution and serve as one of the bases for evaluating the electromagnetic performance of the long stator under test.

[0055] In one exemplary embodiment, the verification sensor 22 is a laser displacement sensor, used to collect gap data between the long stator to be tested and the laser displacement sensor, and to verify the suspension gap data collected by the suspension gap sensor 21 based on the gap data.

[0056] In this embodiment, the verification sensor 22 is a laser displacement sensor, used to collect gap data between the long stator under test and the laser displacement sensor during the test, and to use this gap data to verify the suspension gap data collected by the suspension gap sensor 21. The gap measuring device 12 moves along the length direction of the long stator under test under the drive of the motion control device 13. During the movement, the suspension gap sensor 21 continuously outputs suspension gap data. To verify these data, this embodiment sets a laser displacement sensor on the gap measuring device 12, so that it synchronously measures the distance to the surface of the long stator under test when the gap measuring device 12 moves. The laser displacement sensor obtains the distance information to the surface of the long stator under test by emitting a laser beam and receiving the reflected signal, thus enabling it to output gap data between itself and the long stator under test. This data can be used as reference data for the suspension gap data.

[0057] In practical implementation, the laser displacement sensor can be, but is not limited to, installed near the suspension gap sensor 21, allowing the two sensors to detect the distance between adjacent areas during the movement of the gap measuring device 12. When the gap measuring device 12 moves along the length of the stator to be measured, the laser displacement sensor continuously outputs gap data, which the measurement and control device 14 can compare with the suspension gap data collected by the suspension gap sensor 21. For example, gap data at the same or adjacent positions can be compared to determine if the difference between the two types of data is within an acceptable range. If the two data are consistent or the difference is small, the suspension gap sensor 21 can be considered to be in a normal measurement state; if there is a significant difference between the two, it can indicate that the suspension gap sensor 21 may have a measurement deviation or abnormality.

[0058] This embodiment introduces an independent distance measurement basis during the data acquisition process of the suspension gap, so that the test data has a verifiable reference basis for subsequent tooth groove period analysis and electromagnetic performance evaluation.

[0059] In one exemplary embodiment, the suspension gap sensor 21 is mounted on a sensor mounting fixture, which is connected to the motion control device 13 via a multi-point fixing structure.

[0060] In this embodiment, the suspension gap sensor 21 is mounted on a sensor mounting fixture, which is then connected to the motion control device 13, enabling the suspension gap sensor 21 to move along the length direction of the long stator to be measured along with the gap measuring device 12. Driven by the motion control device 13, the gap measuring device 12 moves relative to the long stator to be measured. During this movement, the suspension gap sensor 21 continuously collects suspension gap data between the long stator and the sensor. By setting up the sensor mounting fixture, the suspension gap sensor 21 can be fixed on a stable mounting base, maintaining a fixed posture and stable position during movement. In this embodiment, the sensor mounting fixture can be, but is not limited to, a metal bracket, mounting plate, or combined mounting frame, ensuring a stable spatial relationship between the suspension gap sensor 21 and the long stator to be measured after installation.

[0061] Regarding structural connections, this embodiment employs a multi-point fixing structure to connect the sensor mounting fixture to the motion control device 13. This multi-point fixing structure can, but is not limited to, using multiple bolt connection points, connecting block structures, or a combination of locating pins and fasteners, allowing the sensor mounting fixture to connect to the motion control device 13 at multiple locations. When the motion control device 13 drives the gap measuring device 12 to move, the sensor mounting fixture can move stably along with it while maintaining structural rigidity. This multi-point connection method reduces swaying or slight offsets during movement, ensuring the suspended gap sensor 21 maintains a stable measuring posture during movement.

[0062] Furthermore, during the electromagnetic performance testing of the long stator, the suspended gap data needs to reflect the gap change characteristics corresponding to the tooth groove structure of the long stator under test. Therefore, the positional stability of the sensor during movement has a significant impact on the measurement results. In this embodiment, by setting up a sensor mounting fixture and using a multi-point fixing structure for connection, the suspended gap sensor 21 maintains a relatively stable position throughout the entire scanning measurement process. When the gap measuring device 12 moves along the length direction of the long stator under test, the suspended gap sensor 21 can continuously output stable suspended gap data, enabling the measurement and control device 14 to perform data processing based on relatively consistent measurement conditions when dividing the period according to the tooth groove structure and calculating evaluation parameters.

[0063] like Figure 5 In one exemplary embodiment, the motion control device 13 includes a first motion mechanism arranged along the length direction of the stator to be measured and a second motion mechanism arranged along the height direction of the stator to be measured. The first motion mechanism is used to drive the gap measuring device 12 to move along the length direction of the stator to be measured; The second motion mechanism is used to adjust the suspension gap between the gap measuring device 12 and the long stator to be measured.

[0064] In this embodiment, the motion control device 13 includes a first motion mechanism arranged along the length direction of the long stator to be tested and a second motion mechanism arranged along the height direction of the long stator to be tested, used to realize the motion control of the gap measuring device 12 in different directions. During the test, the gap measuring device 12 needs to move along the length direction of the long stator to continuously collect suspension gap data at different positions of the long stator. Simultaneously, a certain suspension gap condition needs to be maintained between the gap measuring device 12 and the long stator to be tested, therefore, position adjustment is also required in the height direction. This embodiment, by setting two motion mechanisms in different directions, enables the gap measuring device 12 to be controlled separately in the length and height directions, thereby meeting the motion requirements during the test.

[0065] In the length direction, this embodiment uses a first motion mechanism to drive the gap measuring device 12 to move along the length of the long stator to be measured, which can also be understood as moving along the X-axis. When the first motion mechanism is running, the gap measuring device 12, carrying the suspended gap sensor 21, moves gradually along the length of the long stator to be measured, and performs scanning measurements at different positions of the long stator during the movement. In this embodiment, the first motion mechanism can, but is not limited to, use a linear guide rail and slider structure in conjunction with a drive motor to achieve linear motion, or it can use a lead screw drive structure, rack and pinion drive structure, or linear motor structure, etc., so that the gap measuring device 12 can move stably in the length direction. Under this motion mode, the suspended gap sensor 21 can collect suspended gap data along the entire length range of the long stator to be measured. This data can then be periodically divided according to the toothed structure of the long stator to be measured and used for electromagnetic performance analysis.

[0066] In the height direction, this embodiment adjusts the position of the gap measuring device 12 through the second motion mechanism, which can also be understood as adjusting the height along the Z-axis (e.g., Figure 5 (The Z-axis motion module in the image). The second motion mechanism is used to change the relative height position between the gap measuring device 12 and the long stator to be measured, so that the suspended gap sensor 21 can form a predetermined suspended gap condition with the long stator to be measured. In specific implementation, the second motion mechanism can be, but is not limited to, a lifting screw structure, a sliding guide structure combined with an adjustment mechanism, or an electric lifting mechanism, etc., to adjust the height position of the gap measuring device 12 so that the gap between the sensor and the long stator to be measured is within a set range.

[0067] In this embodiment, through the cooperation of the first motion mechanism and the second motion mechanism, the gap measuring device 12 can perform scanning motion along the length direction of the long stator to be measured, and can also adjust its position in the height direction, so that the suspended gap data remains within the measurable range throughout the entire test process.

[0068] In one exemplary embodiment, it also includes an information acquisition device and a thickness detection device; The information acquisition device is used to collect the identification information of the stator under test; The thickness detection device is used to measure the resin thickness of the long stator after casting.

[0069] This embodiment also includes an information acquisition device and a thickness detection device, used to record relevant information of the long stator under test while conducting electromagnetic performance testing, and to obtain parameters related to the structural state. Combining the initial technical solution, the gap measuring device 12 moves along the length direction of the long stator under test under the drive of the motion control device 13 and collects the suspension gap data. The measurement and control device 14 then divides the data into periods based on the tooth structure and calculates evaluation parameters. In this testing process, different long stators under test often have their own production numbers or identification information. Therefore, before the test begins, collecting the identification information of the long stator under test through the information acquisition device allows each set of test data to be associated with a specific long stator under test. In this embodiment, the information acquisition device can be used, but is not limited to, to read the identification information on the long stator under test, such as numbers, barcodes, or other identification content, so that the suspension gap data obtained during the test can establish a correspondence with the specific long stator under test.

[0070] Furthermore, this embodiment also includes a thickness detection device for measuring the resin thickness of the long stator after casting. During the manufacturing process of the long stator, the casting process typically forms a resin layer of a certain thickness on the surface of the long stator. The thickness of this resin layer may affect the structural state of the long stator and the measurement results of the suspension gap. Therefore, when conducting electromagnetic performance testing, measuring the resin thickness of the long stator after casting using a thickness detection device can obtain parameter information related to the structural state. In this embodiment, the thickness detection device can, but is not limited to, measure at a designated location on the surface of the long stator to be tested, obtain the resin thickness data at the corresponding location, and record it together with the suspension gap data.

[0071] In this way, when analyzing the suspension gap data later, the test results can be further judged by combining the identification information of the long stator under test and the resin thickness information.

[0072] In one exemplary embodiment, the information acquisition device is a barcode scanner, and the thickness detection device is a resin thickness gauge.

[0073] In this embodiment, the information acquisition device can be, but is not limited to, a barcode scanner, used to read the identification information on the long stator under test. In conjunction with the aforementioned technical solution, the long stator under test needs to establish a correlation with the corresponding test data during electromagnetic performance testing. Therefore, the identification information of the long stator under test is read using a barcode scanner before the test begins. In this embodiment, the identification information of the long stator under test can be marked using, but is not limited to, barcodes, QR codes, or other identifiable identifiers. After reading the identification information, the barcode scanner can transmit the corresponding information to the measurement and control device 14, so that the subsequently collected suspension gap data can correspond to the specific long stator under test. In actual use, after installing the long stator under test, the operator can scan the identification on the long stator using the barcode scanner to establish a correspondence between the long stator's identification information and the current test process.

[0074] In this embodiment, the thickness detection device can be, but is not limited to, a resin thickness gauge, used to measure the resin thickness of the long stator after casting. During the manufacturing process, the long stator typically undergoes resin casting on its surface to form a resin layer of a certain thickness. The thickness of this resin layer may affect the distance between the surface of the long stator and the gap measuring device 12. In this embodiment, the resin thickness is measured on the surface of the long stator using a resin thickness gauge, obtaining resin thickness data at corresponding locations. The resin thickness gauge can be used to measure at one or more locations on the surface of the long stator, recording the measured resin thickness data and saving it along with the suspension gap data. In this way, when analyzing the suspension gap data, the resin thickness information can be used to reference and judge the test results.

[0075] like Figure 6 In one exemplary embodiment, the device further includes a long stator hoisting device, which includes a clamping structure for holding the dovetail key structure of the long stator to be tested.

[0076] This embodiment also includes a long stator hoisting device for transporting and installing the long stator to be tested. Since the long stator to be tested typically has a long structural dimension and a large weight, manual handling of it on the long stator mounting device 11 requires significant manpower and has a large potential for positional error. Therefore, a long stator hoisting device is provided to complete the hoisting process of the long stator to be tested. In this embodiment, the hoisting device can be used in conjunction with lifting equipment, but is not limited to, to move the long stator to be tested from the transport position to the vicinity of the testing fixture 23, and then gradually adjust its position so that the long stator to be tested can be placed in the designated installation area of ​​the long stator mounting device 11.

[0077] The hoisting device may include, but is not limited to, a clamping structure for holding the dovetail key structure of the long stator to be tested. Long stators typically have a dovetail key structure, which inherently possesses good mechanical strength and positioning characteristics; therefore, this embodiment utilizes this structure as the clamping position. The clamping structure may, but is not limited to, cooperate with the dovetail key structure via mechanical clamping arms, adjustable clamping blocks, or other forms of clamping components to stably hold the long stator to be tested during hoisting. By clamping the dovetail key structure, the posture of the long stator to be tested can be kept stable during hoisting, and pressure or collisions on other parts of the long stator can be reduced.

[0078] In actual operation, the operator can first clamp the clamping structure with the dovetail key structure of the long stator to be tested, and then use the lifting equipment to drive the hoisting device to move the long stator to be tested to the top of the long stator installation device 11, and then slowly lower it so that the long stator to be tested falls into the installation position.

[0079] Because the clamping position matches the structural features of the long stator, the posture of the long stator under test is more easily kept stable during hoisting, and it is also easier to cooperate with the guiding and positioning structure of the long stator installation device 11 during placement, so that the long stator under test can be accurately installed at the test position.

[0080] In one exemplary embodiment, the clamping structure is a jaw, which engages with the I-shaped cross-section of the dovetail key of the long stator to be measured for clamping.

[0081] In this embodiment, the clamping structure can be, but is not limited to, a claw structure. The claw is used to clamp the dovetail key structure of the long stator under test. As described above, the long stator needs to maintain good posture stability during installation and handling. Therefore, in this embodiment, the claw directly engages with the dovetail key structure of the long stator under test. The dovetail key of the long stator under test typically has an I-shaped cross-section structure. This structure is used to connect with the track structure during track installation and also has a distinct profile and high structural strength. This embodiment utilizes this structure as the clamping position, enabling the claw to form a stable engagement with the dovetail key.

[0082] In practical implementation, the grippers can be, but are not limited to, symmetrically arranged clamping components on both sides, clamping from both sides of the dovetail key's I-shaped cross-section during the clamping process. Since the dovetail key has an I-shaped cross-sectional profile, the clamping portion of the grippers can be designed to fit this profile, allowing the grippers to hold the dovetail key in the side region after clamping. When the grippers and the dovetail key's I-shaped cross-section are engaged, the clamping structure provides stable support to the stator under test during hoisting, maintaining a relatively stable posture during lifting and movement.

[0083] In actual operation, the operator can first control the jaws to open, aligning them with the dovetail key structure of the long stator to be measured. Then, by controlling the jaws to close, the jaws and the I-shaped cross-section of the dovetail key are fitted together for clamping. Once clamping is complete, the hoisting device can lift and move the long stator to be measured to the installation area of ​​the long stator installation device 11.

[0084] Because the clamping position matches the structural features of the long stator, it is easier to maintain a stable state during hoisting and positioning, and it is also convenient for the long stator to be tested to be aligned and installed with the guiding and positioning structure when placed on the long stator mounting device 11.

[0085] In one exemplary embodiment, the clamping structure is driven by a pneumatic actuator and controlled by a solenoid valve.

[0086] In this embodiment, the clamping structure is driven by a pneumatic actuator and controlled by a solenoid valve. As described above, the clamping structure needs to open and close during the hoisting process to cooperate with the dovetail key structure of the long stator to be measured. In this embodiment, the pneumatic actuator provides the driving force to the clamping structure, enabling it to complete the clamping action under the control signal. The pneumatic actuator can be, but is not limited to, a cylinder structure. When the cylinder piston extends or retracts under air pressure, it drives the gripper to open and close, switching the gripper between an open and closed state.

[0087] In terms of control method, this embodiment uses a solenoid valve to control the pneumatic actuator. The solenoid valve can change the on / off state of the air passage according to the control signal, allowing compressed air to enter or exit the pneumatic actuator, thereby controlling the movement direction of the cylinder piston. When performing hoisting operations, the operator can control the solenoid valve to first open the gripper, aligning the gripper with the dovetail key structure of the long stator to be measured; after the gripper position is adjusted, the operator can then control the solenoid valve to activate the pneumatic actuator, causing the gripper to close and form a clamping fit with the I-shaped cross-section of the dovetail key.

[0088] In this way, the opening and closing action of the clamping structure can be controlled according to operational requirements, achieving clamping and release during the hoisting of the long stator to be measured.

[0089] In one exemplary embodiment, the solenoid valve is an air shortage holding solenoid valve, used to maintain the current state when the air or electrical circuit is disconnected.

[0090] In this embodiment, the solenoid valve can be, but is not limited to, an air shortage holding solenoid valve, used to maintain the current state when the air or electrical circuit is disconnected. As described above, the clamping structure is driven by a pneumatic actuator, and the solenoid valve controls the entry or exit of compressed air into or out of the pneumatic actuator, thereby opening or closing the grippers. During the hoisting of a long stator, the weight of the long stator under test is significant; if the clamping state changes unexpectedly, it may cause a change in the posture of the long stator under test or even its detachment. Therefore, this embodiment uses an air shortage holding solenoid valve to ensure that the clamping structure maintains its original working state even when the air or power supply is interrupted.

[0091] Specifically, when the solenoid valve is in a certain control state, the air pressure inside the pneumatic actuator is locked, and the clamping structure remains in its current clamped or open state. For example, when the gripper has already formed a clamping engagement with the dovetail key structure of the long stator under test and is in the process of hoisting, even if the external air supply is temporarily interrupted or the solenoid valve control signal disappears, the air shortage-holding solenoid valve can still maintain the air pressure inside the pneumatic actuator, allowing the gripper to continue to maintain the clamping state. In this case, the posture of the long stator under test will not change due to instantaneous changes in the air or electrical circuits during the hoisting process.

[0092] In practical applications, operators can begin lifting after completing the clamping action. Once the lifting device moves the long stator to be measured to the vicinity of the long stator mounting device 11 and completes its installation and positioning, the pneumatic actuator is activated by controlling the solenoid valve to open the grippers and release the long stator. Because the solenoid valve has a short-supply retention function, even if there are fluctuations in the air supply or a short-term interruption of the control signal during the lifting process, the clamping structure can still maintain its original clamping state, ensuring a stable lifting process.

[0093] like Figure 7 Secondly, the present invention provides a method for testing the electromagnetic performance of a long stator, applied to the aforementioned electromagnetic performance testing apparatus for a long stator. The method for testing the electromagnetic performance of a long stator includes: S11: Install the stator to be tested and set the test gap; In this embodiment, the long stator to be tested is first installed onto the long stator mounting device 11, and the test gap is set. Specifically, the long stator to be tested can be transported to the long stator mounting device 11 using a long stator hoisting device, and then placed in the corresponding installation position. During installation, the guiding positioning structure engages with the dovetail key mounting holes of the long stator to ensure it is positioned in the predetermined position in both the length and lateral directions. Simultaneously, the height adjustment structure can adjust the installation height of the long stator to ensure its overall posture is suitable for testing. In this embodiment, this positioning and height adjustment method ensures that the long stator to be tested maintains a stable position after installation.

[0094] After the long stator under test is installed, the test gap between the gap measuring device 12 and the long stator needs to be set. In this embodiment, the gap measuring device 12 is located below the long stator mounting device 11. Its height is adjusted by the second motion mechanism in the motion control device 13, so that a predetermined floating gap is formed between the suspended gap sensor 21 and the long stator under test. This test gap can be adjusted according to a preset distance, for example, it can be set to a gap value within a certain fixed range according to actual test requirements. After the test gap is adjusted, a stable relative positional relationship is formed between the suspended gap sensor 21 and the long stator under test, providing the basic conditions for subsequent gap data acquisition.

[0095] S12: Control the gap measuring device to move along the length of the long stator and collect the suspension gap data; In this embodiment, the gap measuring device 12 is controlled by the motion control device 13 to move along the length direction of the long stator to be measured. Specifically, the first motion mechanism in the motion control device 13 is arranged along the length direction of the long stator to be measured. When the first motion mechanism runs, it can drive the sensor mounting fixture mounted on it to move as a whole. Since the suspended gap sensor 21 is mounted on the sensor mounting fixture, under the drive of the first motion mechanism, the suspended gap sensor 21 can gradually pass through different positions along the length direction of the long stator to be measured, realizing a scanning measurement of the entire long stator. In this embodiment, the gap measuring device 12 maintains a set suspended gap with the long stator to be measured and will not contact the long stator during movement.

[0096] During the movement, the suspension gap sensor 21 continuously detects the distance between the surface of the long stator under test and the sensor, and outputs the corresponding suspension gap data. In this embodiment, the suspension gap data can be collected according to a preset sampling frequency, for example, sampling at fixed time intervals or fixed position intervals during the movement of the gap measuring device 12, so that a continuous gap data sequence is formed along the length direction of the long stator under test. In this way, the change of suspension gap of the long stator under test at different positions can be obtained, and these suspension gap data reflect the electromagnetic effect gap change characteristics of the long stator under test along its length direction.

[0097] S13: Divide the collected suspension gap data periodically according to the tooth groove structure of the long stator to be tested; In this embodiment, the long stator under test typically has a toothed groove structure that is periodically distributed along its length. When the gap measuring device 12 moves along the length of the long stator under test, the suspension gap data collected by the suspension gap sensor 21 will also exhibit certain periodic characteristics as the toothed groove structure changes. Therefore, after obtaining continuous suspension gap data, it is necessary to divide these data into periods based on the toothed groove structure of the long stator under test. In this embodiment, the measurement and control device 14 can segment the collected suspension gap data according to the tooth pitch parameters of the long stator under test, so that each segment of data corresponds to a toothed groove period.

[0098] In practice, the number of data points contained in each tooth groove cycle can be determined based on the movement speed of the gap measuring device 12 and the sampling frequency of the suspension gap sensor 21. When the gap measuring device 12 moves from one tooth to an adjacent groove position, a set of suspension gap data collected during this period can be classified into the same tooth groove cycle. In this embodiment, the periodic characteristics of the change in suspension gap data can also be detected to help identify the tooth groove boundary position. In this way, the original continuous suspension gap data is divided into multiple periodic data segments corresponding to the tooth groove structure, so that each set of data can correspond to a tooth groove unit on the long stator to be measured.

[0099] S14: Using the tooth groove cycle as the unit, calculate the evaluation parameters based on the collected suspension gap data, and determine the electromagnetic performance of the long stator to be tested based on the evaluation parameters.

[0100] In this embodiment, after the periodic division of the suspension gap data is completed, the data can be calculated and analyzed in units of the tooth groove period. Specifically, the measurement and control device 14 can perform statistical processing on the data within each tooth groove period, such as calculating the average value, amplitude, or difference of the suspension gap data within that period. In this embodiment, by processing the suspension gap data within the same tooth groove period, a set of evaluation parameters reflecting the electromagnetic gap characteristics of that tooth groove region can be obtained.

[0101] Once the data for all tooth groove cycles has been calculated, the obtained evaluation parameters can be comprehensively analyzed. In this embodiment, the evaluation parameters for each tooth groove cycle can be compared with a pre-set standard range to determine the electromagnetic gap variation at different locations. When the evaluation parameters corresponding to certain tooth groove cycles show significant deviations, it can be considered that the electromagnetic performance at the corresponding location exhibits abnormal characteristics. By analyzing the evaluation parameters for all tooth groove cycles, the electromagnetic performance distribution along the length direction of the long stator under test can be obtained, and the overall electromagnetic performance state of the long stator under test can be determined accordingly.

[0102] The following is combined Figure 8 and Figure 9The testing method is further described below. In one exemplary embodiment, the gap measuring device 12 includes a suspension gap sensor 21 for acquiring suspension gap data between the long stator under test and the suspension gap sensor 21, and a verification sensor 22 for verifying the suspension gap data; the electromagnetic performance testing method for the long stator further includes: The average value of the suspension gap data measured by the suspension gap sensor 21 is compared with the average value of the gap data measured by the calibration sensor 22. When the deviation between the two average values ​​is within the preset range, the suspension gap sensor 21 is determined to be working normally.

[0103] In this embodiment, the gap measuring device 12 includes a suspended gap sensor 21 and a verification sensor 22. The suspended gap sensor 21 is used to collect the suspended gap data between the long stator under test and the suspended gap sensor 21, and the verification sensor 22 is used to verify the suspended gap data. During the electromagnetic performance test of the long stator, the suspended gap sensor 21 needs to continuously measure along the length direction of the long stator under test under the drive of the motion control device 13. Therefore, its measurement data is directly used for subsequent tooth groove period division and evaluation parameter calculation. In this embodiment, by setting the verification sensor 22, the measurement results of the suspended gap sensor 21 can be compared and judged during the test, so that the collected suspended gap data has a verifiable reference basis.

[0104] In the specific implementation process, the suspension gap sensor 21 continuously collects suspension gap data as the gap measuring device 12 moves along the length direction of the stator to be measured. This data can form a continuous data sequence during a measurement period. In this embodiment, the suspension gap data collected by the suspension gap sensor 21 within a certain test section can be statistically processed, for example, by calculating the average value of the data sequence. Simultaneously, the verification sensor 22 also measures the gap between the stator to be measured and the verification sensor 22, obtaining the corresponding gap data sequence. The gap data collected by the verification sensor 22 can also be statistically processed, for example, by calculating the average value of the corresponding data sequence, to form a reference data for comparison.

[0105] After obtaining the average values ​​of the two sensors, this embodiment compares the average value of the suspension gap data measured by the suspension gap sensor 21 with the average value of the gap data measured by the calibration sensor 22. Since the two sensors are in relatively close positions during the test and both measure the gap between the stator to be tested and the sensor, their average values ​​are usually within a similar range under normal operating conditions. In this embodiment, an allowable deviation range can be preset based on equipment calibration results or testing experience. When the difference between the two average values ​​is within this range, the measurement results of the two sensors can be considered consistent.

[0106] After the comparison is completed, if the deviation between the two average values ​​is within a preset range, this embodiment determines that the suspension gap sensor 21 is working normally. At this time, the suspension gap data collected by the suspension gap sensor 21 can continue to be used for subsequent tooth groove period division and evaluation parameter calculation. If the deviation between the two average values ​​exceeds the preset range, it indicates that the measurement results of the suspension gap sensor 21 may be abnormal, such as changes in the sensor installation position, unstable measurement state, or data deviation caused by other reasons. In this case, the suspension gap sensor 21 can be checked or recalibrated as needed before continuing subsequent tests. This embodiment uses this average value comparison method to provide a basic verification basis for the suspension gap data before it enters the subsequent analysis steps.

[0107] In one exemplary embodiment, after installing the long stator to be tested and setting the test gap, and before controlling the gap measuring device 12 to move along the length direction of the long stator, the method further includes: The gap data corresponding to the test gap is collected by the calibration sensor 22 to determine whether the installation level of the long stator under test meets the preset requirements, and adjustments are made when the installation level does not meet the preset requirements.

[0108] In this embodiment, after the installation of the long stator to be tested is completed and the test gap is set, before controlling the gap measuring device 12 to move along the length of the long stator, it is necessary to check the installation status of the long stator to be tested, one of the checks being the installation level. In this embodiment, the gap data corresponding to the test gap is collected by the calibration sensor 22 to determine whether the installation level of the long stator to be tested meets the preset requirements. Since the calibration sensor 22 can measure the distance between the long stator to be tested and the sensor, when the long stator to be tested is in a stationary state, collecting this gap data can reflect the height change of the long stator to be tested at the installation position.

[0109] In practice, the calibration sensor 22 can measure the test gap at one or more locations on the stator under test, for example, by collecting gap data at different length positions on the stator. In this embodiment, when the stator is installed relatively horizontally, the gap data measured at different locations are usually within a relatively close range; if the stator is tilted or has a local height deviation during installation, the gap data measured at different locations will show significant differences. By comparing these gap data, the overall posture of the stator on the mounting device can be determined.

[0110] After obtaining the gap data, this embodiment can compare the collected data with preset requirements to determine whether the installation level of the long stator under test meets the test conditions. The preset requirements can be set according to the equipment installation accuracy or test specifications, such as the allowable height difference range or gap variation range. When the gap data variation collected by the calibration sensor 22 is within this range, the installation level of the long stator under test can be considered to meet the requirements, and subsequent gap measurement steps can then be performed.

[0111] If the gap data collected by the calibration sensor 22 indicates that the installation level of the long stator under test does not meet the preset requirements, this embodiment can adjust the installation state of the long stator under test. For example, the height adjustment structure in the long stator installation device 11 can be used to adjust the local height of the long stator under test, thereby changing the posture of the long stator under test in the installation position. After the adjustment is completed, the gap data corresponding to the test gap can be collected again by the calibration sensor 22 for judgment, until the installation level of the long stator under test meets the preset requirements. In this way, before the gap measuring device 12 starts to move along the length direction, it is ensured that the installation state of the long stator under test meets the test conditions.

[0112] In one exemplary embodiment, the gap data corresponding to the test gap is collected by the calibration sensor 22 to determine whether the installation level of the long stator under test meets the preset requirements, including: If the difference in the minimum value measured by a single calibration sensor 22 within different tooth groove cycles at different positions of the long stator to be tested does not exceed a preset threshold, and the difference in the real-time gap between at least two calibration sensors 22 does not exceed a preset threshold, it is determined that the installation level of the long stator to be tested meets the preset requirements.

[0113] In this embodiment, the gap data corresponding to the test gap is collected by the calibration sensor 22 to determine whether the installation level of the long stator under test meets the preset requirements. Since the long stator under test has a periodically distributed toothed groove structure along its length, the gap data output by the calibration sensor 22 will also fluctuate periodically with the change in the position of the teeth and grooves when measuring the long stator. Therefore, this embodiment does not simply rely on a single measurement value for judgment, but rather combines the characteristic data within the toothed groove period and the data differences between different sensors to comprehensively determine the installation level of the long stator under test.

[0114] In one implementation, this embodiment first performs measurements at different locations on the long stator to be tested. A single calibration sensor 22 collects gap data within multiple tooth groove cycles as the gap measuring device 12 moves along the length direction. For each tooth groove cycle, the minimum value can be extracted from the corresponding data segment. This minimum value typically corresponds to the gap characteristic value when the sensor passes the tooth tip or a specific structural position. In this embodiment, by comparing the minimum values ​​measured by the same calibration sensor 22 in different tooth groove cycles, when the difference between these minimum values ​​does not exceed a preset threshold, it can be considered that the height change of the long stator to be tested in the length direction is small, and the overall installation posture is relatively stable.

[0115] Furthermore, this embodiment further determines the gap by using the real-time gap difference between at least two verification sensors 22. In practice, two or more verification sensors 22 can be arranged on the gap measuring device 12, allowing these sensors to measure different positions of the stator under test simultaneously. When the stator under test is mounted in a relatively horizontal position, the gap data measured by different verification sensors 22 are usually within a similar range at the same time; however, if the stator under test has a height deviation in the lateral or local position, the real-time gap data between different verification sensors 22 may show significant differences. This embodiment calculates the difference between these real-time gap data and compares it with a preset threshold.

[0116] When both of the above judgment conditions are met simultaneously—that is, the difference in the minimum value measured by a single verification sensor 22 within different tooth groove cycles does not exceed a preset threshold, and the difference in the real-time gap between at least two verification sensors 22 does not exceed a preset threshold—this embodiment determines that the installation level of the long stator under test meets the preset requirements. In this case, it can be considered that the attitude of the long stator under test on the long stator mounting device 11 has met the test conditions, and the subsequent suspension gap data acquisition process can continue. If either condition is not met, it indicates that the installation attitude of the long stator under test still has a deviation, and its installation state needs to be adjusted before re-judgment.

[0117] In one exemplary embodiment, the gap measuring device 12 includes a suspended gap sensor, which is a dual-channel gap sensor. Using the tooth groove cycle as the unit, it calculates evaluation parameters based on the collected suspended gap data, and determines the electromagnetic performance of the long stator under test based on the evaluation parameters, including: The suspended gap data collected in each tooth groove cycle is processed, the arithmetic mean of all suspended gap data in the tooth groove cycle is calculated to obtain the corresponding suspended gap average value, and the suspended gap average value is compared with the actual electromagnetic gap value to calculate the first difference between the two and determine whether the first difference is within the specified range. Determine the maximum and minimum suspension gap values ​​from the suspension gap data corresponding to the tooth groove cycle. Calculate the second difference between the maximum suspension gap value and the average suspension gap value, and the third difference between the minimum suspension gap value and the average suspension gap value, and determine whether the second and third differences are both within the specified range. Two suspension gap data from the suspension gap sensor are acquired separately, and a fourth difference between the two suspension gap data is calculated to determine whether the fourth difference is within the specified range. When all evaluation results meet the corresponding specified range, the electromagnetic performance at the corresponding position of the tooth groove cycle is deemed to meet the requirements.

[0118] In this embodiment, after acquiring the suspension gap data and dividing the tooth groove period, the suspension gap data is processed in units of tooth groove period, and evaluation parameters are calculated to determine the electromagnetic performance state of the long stator under test. Since the tooth groove structure of the long stator under test is periodically distributed along its length, the suspension gap sensor 21 acquires a corresponding set of data within each tooth groove period. In this embodiment, the suspension gap data acquired within each tooth groove period is processed as an independent data set, so that each tooth groove period corresponds to a set of evaluation results, thereby reflecting the electromagnetic gap state of the long stator under test at different positions.

[0119] In the specific implementation process, this embodiment first performs statistical processing on the suspended gap data collected by the gap measuring device 12 within each tooth groove cycle, and calculates the arithmetic mean of all suspended gap data within that tooth groove cycle to obtain the average suspended gap value corresponding to the tooth groove cycle. The average suspended gap value reflects the overall gap level between the long stator under test and the suspended gap sensor 21 within the tooth groove cycle. The average suspended gap value is compared with the actual electromagnetic gap value to obtain the first difference between the two. In this embodiment, the actual electromagnetic gap value can be determined, but is not limited to, through calibration data, design parameters, or reference measurement results. When the first difference is within a specified range, it can be considered that the overall gap level at the corresponding position of the tooth groove cycle is consistent with the expectation; if the first difference exceeds the range, it indicates that there may be an electromagnetic gap deviation at that position.

[0120] Building upon this, this embodiment further analyzes the fluctuation of the suspension gap data within the same tooth groove cycle. By determining the maximum and minimum suspension gap values ​​within this cycle, and calculating the second difference between each value and the average suspension gap value, the gap variation within that tooth groove cycle can be obtained. Specifically, the second difference between the maximum value and the average value reflects the degree of upward gap shift, and the third difference between the minimum value and the average value reflects the degree of downward gap shift. This embodiment determines whether the gap variation within the tooth groove cycle is within a reasonable range by judging whether both differences are within a specified range.

[0121] Furthermore, in this embodiment, the suspension gap sensor is a dual-channel gap sensor, capable of acquiring two channels of suspension gap data at the same location. During data processing, the two channels of suspension gap data can be compared, and a fourth difference between them can be calculated. When the fourth difference between the two channels of gap data is within a specified range, the two measurement results can be considered consistent; if the difference is too large, it may reflect an abnormal sensor condition or a deviation in local measurement. This embodiment further constrains the reliability of the suspension gap data through this multi-channel data comparison method.

[0122] After completing the above evaluations, this embodiment comprehensively judges the average value evaluation result of the suspension gap, the amplitude evaluation result, and the difference evaluation result between the two gaps. When all results meet the corresponding specified range, it can be determined that the electromagnetic performance at the corresponding position of the tooth groove cycle meets the requirements; if any one of them does not meet the requirements, it indicates that there are abnormal characteristics at that position. By performing the above processing on all tooth groove cycles one by one, the electromagnetic performance distribution of the long stator under test over the entire length range can be obtained. If any parameter exceeds the preset range, it can be considered that the electromagnetic gap state at the corresponding tooth groove position is abnormal. Through this cycle-by-cycle judgment method, the electromagnetic performance distribution of the long stator under test along the length direction can be obtained.

[0123] In one exemplary embodiment, the collected suspension gap data is periodically divided according to the tooth groove structure of the long stator under test, including: Based on the sampling frequency of the suspended gap sensor 21 in the gap measuring device 12 and the relative motion speed between the gap measuring device 12 and the long stator to be measured, the number of data points collected when the gap measuring device 12 moves a distance between one tooth and one slot is calculated. Starting from the first tooth of the long stator to be tested, all the suspended gap data collected within the distance range of each tooth and slot moved by the gap measuring device 12 are collected into a data set of one tooth slot cycle.

[0124] In this embodiment, after the suspension gap data acquisition is completed, the data needs to be periodically divided according to the tooth and groove structure of the long stator under test. Since the teeth and grooves of the long stator under test are arranged regularly along its length, the data collected by the suspension gap sensor 21 will exhibit periodic changes as the tooth and groove structure changes when the gap measuring device 12 moves along the length direction. Therefore, this embodiment uses a combination of the sampling frequency of the suspension gap sensor 21 and the relative speed between the gap measuring device 12 and the long stator under test to regularly divide the suspension gap data, so that each segment of data corresponds to a tooth and groove structural unit of the long stator under test.

[0125] In the specific implementation process, this embodiment first calculates the number of data points collected by the gap measuring device 12 when it moves a certain distance based on the sampling frequency of the suspension gap sensor 21 and the relative movement speed between the gap measuring device 12 and the long stator to be measured. For example, when the suspension gap sensor 21 continuously collects data at a fixed sampling frequency, and the gap measuring device 12 moves at a constant speed along the length direction of the long stator to be measured under the drive of the motion control device 13, the number of data points corresponding to moving the distance between one tooth and one slot can be calculated based on the moving distance per unit time and the number of data points collected per unit time. In this embodiment, this distance can be determined based on the tooth pitch structure of the long stator to be measured, so that the calculated number of data points corresponds to the actual tooth slot structure.

[0126] After obtaining the number of data points, this embodiment uses the first tooth of the long stator under test as the starting reference position to sequentially divide the collected suspension gap data. As the gap measuring device 12 moves along the length direction from the first tooth, all suspension gap data collected within the distance of moving one tooth and one slot is aggregated into a data set for one tooth-slot cycle. Subsequently, as the gap measuring device 12 continues to move forward to the position of the next tooth and slot, the suspension gap data collected within the corresponding distance range is aggregated into a data set for the next tooth-slot cycle.

[0127] Specifically, refer to Figure 8 and Figure 9The specific testing process is as follows: Step 1: System Power-On: Power on the entire testing system, including the host computer and servo system; Step 2: Login to Host Computer Software System Self-Check: Log in to the host computer testing software. The system automatically completes a self-check. After passing the self-check, proceed with subsequent operations; Step 3: System Reset: The sensor returns to the test start position, ready for testing; Step 4: Tooling Loading: Use a long stator hanger to install the long stator to be tested and adjust it to be level. Set the gap value between the long stator to be tested and the sensor, as well as the relative movement speed of the sensor. Control the sensor to perform relative movement and collect data from the suspension gap sensor and the laser displacement sensor. The minimum difference between the values ​​measured by a single laser displacement sensor at different positions on the long stator to be tested within different tooth groove cycles does not exceed the specified value; the real-time gap difference between the two laser displacement sensors does not exceed the specified value. These two items are used to determine the installation level of the long stator to be tested. Within the length range of the long stator to be tested, the deviation between the average gap measured by the suspension gap sensor and the average gap measured by the laser displacement sensor is within the specified range, thus determining that the suspension gap sensor is functioning normally. Step 5: Test Start: Use a barcode scanner to record the serial number of the long stator to be tested, use a resin thickness gauge to measure the resin thickness, then control the suspension gap sensor to move along the X-axis to collect the gap data of the suspension gap sensor, and store, analyze, and evaluate the data through the host computer. Step 6: Report Generation: Generate a test report for the long stator to be tested according to the prescribed format, and indicate whether it is qualified or not. Step 7: Tooling Unloading: Use a long stator lifting tool to unload the tested long stator, install the new long stator to be tested, and begin a new test cycle.

[0128] In this way, the original continuous suspension gap data can be divided into multiple sequentially arranged data sets, each corresponding to one slot cycle of the long stator under test. After this processing, the data within each slot cycle can be statistically analyzed and calculated independently, such as calculating the average suspension gap value or the suspension gap amplitude, so that the subsequent evaluation of the electromagnetic performance of the long stator under test can establish a correspondence with the actual slot structure position.

[0129] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0130] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromagnetic performance testing device for a long stator, characterized in that, include: A long stator mounting device is used to mount the long stator to be tested and generate a long stator gap for simulating the track splicing state; A gap measuring device is disposed below the long stator mounting device and is used to collect suspension gap data during relative motion with the long stator to be measured. A motion control device, connected to the gap measuring device, is used to drive the gap measuring device to move along the length direction of the long stator to be measured, and to adjust the suspension gap between the gap measuring device and the long stator to be measured. The measurement and control device is connected to the gap measuring device and the motion control device respectively. It is used to divide the collected suspension gap data into periods according to the tooth groove structure of the long stator to be measured during the movement of the gap measuring device along the long stator to be measured, and to calculate the evaluation parameters based on the suspension gap data in units of tooth groove period, and to determine the electromagnetic performance of the long stator to be measured based on the evaluation parameters.

2. The electromagnetic performance testing device for a long stator according to claim 1, characterized in that, The long stator mounting device includes auxiliary long stators disposed on both sides of the long stator to be tested, forming two long stator gaps with the long stator to be tested, so as to simulate the long stator gap in the track splicing state.

3. The electromagnetic performance testing device for a long stator according to claim 2, characterized in that, The auxiliary long stator is fixedly installed on the test fixture, and the long stator to be tested is detachably installed on the test fixture; The installation position of the auxiliary long stator is provided with an adjustment structure for adjusting the gap between the auxiliary long stator and the long stator to be tested.

4. The electromagnetic performance testing device for a long stator according to claim 1, characterized in that, The long stator mounting device includes a guiding and positioning structure and a height adjustment structure; The guiding and positioning structure is used to mate with the mounting hole of the dovetail key of the stator to be measured for positioning. The height adjustment structure is used to adjust the installation height of the stator to be measured.

5. The electromagnetic performance testing device for a long stator according to claim 1, characterized in that, The gap measuring device includes a suspended gap sensor and a calibration sensor. The suspension gap sensor is used to collect suspension gap data between the length stator to be measured and the suspension gap sensor; The verification sensor is used to verify the suspension gap data.

6. The electromagnetic performance testing device for a long stator according to claim 5, characterized in that, The suspension gap sensor is a multi-channel suspension gap sensor, used to simultaneously acquire suspension gap data from multiple channels.

7. The electromagnetic performance testing device for a long stator according to claim 5, characterized in that, The verification sensor is a laser displacement sensor, used to collect gap data between the long stator to be tested and the laser displacement sensor, and to verify the suspension gap data collected by the suspension gap sensor based on the gap data.

8. The electromagnetic performance testing device for a long stator according to claim 5, characterized in that, The suspension gap sensor is mounted on a sensor mounting fixture, which is connected to the motion control device through a multi-point fixing structure.

9. The electromagnetic performance testing device for a long stator according to claim 1, characterized in that, The motion control device includes a first motion mechanism arranged along the length direction of the stator to be measured and a second motion mechanism arranged along the height direction of the stator to be measured. The first motion mechanism is used to drive the gap measuring device to move along the length direction of the stator to be measured; The second motion mechanism is used to adjust the suspension gap between the gap measuring device and the long stator to be measured.

10. The electromagnetic performance testing device for a long stator according to claim 1, characterized in that, It also includes information acquisition devices and thickness detection devices; The information acquisition device is used to acquire the identification information of the stator under test. The thickness detection device is used to measure the resin thickness of the long stator after casting.

11. The electromagnetic performance testing device for a long stator according to claim 10, characterized in that, The information collection device is a barcode scanner, and the thickness detection device is a resin thickness gauge.

12. The electromagnetic performance testing apparatus for a long stator according to any one of claims 1-11, characterized in that, It also includes a long stator hoisting device, which includes a clamping structure for holding the dovetail key structure of the long stator to be tested.

13. The electromagnetic performance testing device for a long stator according to claim 12, characterized in that, The clamping structure is a jaw, which engages with the I-shaped cross-section of the dovetail key of the stator to be measured for clamping.

14. The electromagnetic performance testing device for a long stator according to claim 13, characterized in that, The clamping structure is driven by a pneumatic actuator and controlled by a solenoid valve.

15. The electromagnetic performance testing device for a long stator according to claim 14, characterized in that, The solenoid valve is an air shortage holding solenoid valve, used to maintain the current state when the air or electrical circuit is disconnected.

16. A method for testing the electromagnetic properties of a long stator, characterized in that, The electromagnetic performance testing apparatus for a long stator according to any one of claims 1-15, wherein the electromagnetic performance testing method for the long stator comprises: Install the stator to be tested and set the test gap; The control gap measuring device moves along the length of the long stator and collects suspension gap data; The collected suspension gap data is periodically divided based on the tooth groove structure of the long stator to be tested; Evaluation parameters are calculated based on the collected suspension gap data, using the tooth groove cycle as the unit, and the electromagnetic performance of the long stator under test is determined based on the evaluation parameters.

17. The method for testing the electromagnetic properties of a long stator according to claim 16, characterized in that, The gap measuring device includes a suspension gap sensor for collecting suspension gap data between the length stator to be measured and the suspension gap sensor, and a verification sensor for verifying the suspension gap data; The electromagnetic performance testing method for the long stator also includes: The average value of the suspension gap data measured by the suspension gap sensor is compared with the average value of the gap data measured by the calibration sensor. When the deviation between the two average values ​​is within a preset range, the suspension gap sensor is determined to be working normally.

18. The method for testing the electromagnetic properties of a long stator according to claim 17, characterized in that, After installing the long stator to be tested and setting the test gap, and before controlling the gap measuring device to move along the length of the long stator, the following steps are also included: The gap data corresponding to the test gap is collected by the calibration sensor to determine whether the installation level of the long stator under test meets the preset requirements, and adjustments are made when the installation level does not meet the preset requirements.

19. The method for testing the electromagnetic properties of a long stator according to claim 18, characterized in that, By collecting gap data corresponding to the test gap through a calibration sensor, it is determined whether the installation level of the long stator under test meets the preset requirements, including: If the difference in the minimum value measured by a single calibration sensor within different tooth groove cycles at different positions of the long stator to be tested does not exceed a preset threshold, and the difference in the real-time gap between at least two calibration sensors does not exceed a preset threshold, then the installation level of the long stator to be tested is determined to meet the preset requirements.

20. The method for testing the electromagnetic properties of a long stator according to any one of claims 16-19, characterized in that, The gap measuring device includes a suspended gap sensor, and the suspended gap sensor is a dual-channel gap sensor. It calculates evaluation parameters based on the collected suspended gap data, using the tooth groove cycle as the unit, and determines the electromagnetic performance of the long stator under test based on the evaluation parameters, including: The suspended gap data collected in each tooth groove cycle is processed to calculate the arithmetic mean of all suspended gap data in the tooth groove cycle to obtain the corresponding suspended gap average value. The suspended gap average value is then compared with the actual electromagnetic gap value to calculate the first difference between the two and to determine whether the first difference is within the specified range. Determine the maximum and minimum suspension gap values ​​from the suspension gap data corresponding to the tooth groove cycle, calculate the second difference between the maximum suspension gap value and the average suspension gap value, and the third difference between the minimum suspension gap value and the average suspension gap value, and determine whether the second difference and the third difference are both within the specified range. Two suspension gap data from the suspension gap sensor are acquired respectively, and a fourth difference between the two suspension gap data is calculated to determine whether the fourth difference is within the specified range. When all evaluation results meet the corresponding specified range, the electromagnetic performance at the position corresponding to the tooth groove cycle is deemed to meet the requirements.

21. The method for testing the electromagnetic properties of a long stator according to any one of claims 16-19, characterized in that, The collected suspension gap data is periodically divided based on the tooth groove structure of the long stator under test, including: Based on the sampling frequency of the suspended gap sensor in the gap measuring device and the relative motion speed between the gap measuring device and the long stator to be measured, the number of data points collected when the gap measuring device moves the distance between one tooth and one slot is calculated. Starting from the first tooth of the long stator to be tested, all the suspended gap data collected within the distance range of each tooth and slot moved by the gap measuring device are collected into a data set of one tooth slot cycle.

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