Eddy current rotating speed sensor testing device and method

Abstract

The invention relates to an eddy current rotating speed sensor testing device and method, and relates to the technical field of eddy current rotating speed sensor testing. The right-angle commutator comprises a driving shaft and two output shafts, the driving shaft is connected with the servo motor, and the two output shafts are used for being connected with a rotor; the support is connected to one end of the rotor, a mounting hole is formed in the support, the support is used for being connected with a stator through the mounting hole, a separation gap is formed between the stator and the rotor, and the stator is used for detecting rotating speed information of the rotor and converting the rotating speed information of the rotor into an electric signal to form a characteristic waveform. According to the invention, stable rotating speed output can be maintained, rotors of two groups of eddy current rotating speed sensors can be tested at the same time, the test efficiency is directly improved, the rotating speed precision actually output by the eddy current rotating speed sensors can be ensured through comparison, and the use requirements are met.

Description

Technical Field

[0001] The present application relates to the technical field of eddy current speed sensor testing, and in particular to a device and method for testing an eddy current speed sensor. Background Art

[0002] In the development of electric drive systems for new energy vehicles, accurate acquisition of motor speed information is crucial to achieving efficient, stable and safe operation.

[0003] In traditional electric drive systems, resolvers are a common component for providing speed feedback. However, with continuous technological advancements, the output speed of electric drive systems has gradually increased from an initial 10,000 rpm to nearly 30,000 rpm. Resolvers, limited by their inherent operating principles, have gradually exposed numerous shortcomings when operating at extremely high speeds, making it difficult to meet the performance requirements of high-speed operation. Against this backdrop, eddy current speed sensors have emerged, leveraging their unique advantages. They offer lower cost, high-speed compatibility, excellent temperature tolerance, and strong resistance to electromagnetic interference, and are gradually replacing traditional resolvers.

[0004] When an eddy current speed sensor operates, it generates a characteristic waveform consisting of four waveforms: sin+, sin-, cos+, and cos-. The phase difference between sin+ and sin- is 180°, and the phase difference between sin+ and cos+ is 90°. This characteristic waveform contains information about the eddy current speed sensor's rotor speed, providing critical data for subsequent analysis and processing.

[0005] Currently, there are three main approaches to acquiring rotor speed. The first is to use a "multi-channel waveform generator" to simulate and output the characteristic waveform. This approach simulates and outputs the characteristic waveform of the eddy current speed sensor and requires at least four independent waveform output channels, with adjustable phase differences between the four channels. Currently, such a four-channel waveform generator is relatively expensive. The second approach involves developing a dedicated "waveform simulation board" that outputs the desired waveform according to pre-set parameters. This requires separate development and customization, resulting in a long development cycle, difficult cost control, and poor versatility. Furthermore, the reliability and stability of the board hardware cannot be guaranteed. The third approach involves using a brushless DC motor or stepper motor to drive the rotor. However, the actual speed output of a brushless DC motor is not highly accurate and exhibits significant speed deviation. Stepper motors have a low maximum speed and are prone to overheating and failure when operated at their maximum speed for extended periods.

[0006] Therefore, the three current rotor speed acquisition schemes cannot meet the use requirements of collecting the characteristic waveforms generated by the eddy current speed sensor at different speeds, especially when operating for a long period of time and under conditions with speed requirements. Summary of the Invention

[0007] The embodiments of the present application provide an eddy current speed sensor testing device and method to solve the problem in the related art that when the eddy current speed sensor operates at different speeds, especially under long-term conditions with speed requirements, it is difficult to collect the characteristic waveforms generated by the rotor.

[0008] In a first aspect, an eddy current speed sensor testing device is provided, which includes: a servo motor; a right-angle commutator, which includes a drive shaft and two output shafts, the drive shaft is connected to the servo motor, and the two output shafts are used to connect to the rotor; a bracket, which is connected to one end of the rotor, and the bracket is provided with a mounting hole, which is used to connect a stator through the mounting hole, and a separation gap is provided between the stator and the rotor, and the stator is used to detect the speed information of the rotor and convert the speed information of the rotor into an electrical signal to form a characteristic waveform.

[0009] In some embodiments, a base plate is further included, the bracket is provided with a waist-shaped hole, the bracket is connected with a bolt, and the rod of the bolt passes through the waist-shaped hole and is threadedly engaged with the base plate.

[0010] In some embodiments, a connecting block is movably connected to the output shaft, and a locking piece is provided on the connecting block. The locking piece is used to lock the connecting block on the output shaft. The rotor is connected to the connecting block, and the tail end of the connecting block is threadedly connected with a top screw, and the top screw is used to abut against the output shaft.

[0011] In some embodiments, the connecting block is provided with a step portion, the rotor is mounted on the step portion, and the connecting block is provided with a fixing assembly, which is used to lock the rotor on the step portion and make it press against the side wall of the step portion.

[0012] In some embodiments, the fixing assembly includes: a bushing connected to the connecting sleeve and located on one side of the rotor; a fixing nut, a threaded section is provided on the connecting block, and the fixing nut cooperates with the threaded section to tighten the bushing to the rotor.

[0013] In some embodiments, the stator is connected to a plug-in terminal, which is used to connect to a data acquisition card. The plug-in terminal is used to extract the characteristic waveform of the rotor from the stator and transmit it to the data acquisition card.

[0014] In a second aspect, a method for testing an eddy current speed sensor is provided, and an eddy current speed sensor testing device as described in any one of the items is provided; the stator is mounted on the bracket and the rotor is connected to the output shaft; the separation gap between the rotor and the stator is adjusted so that the error of the stator detecting the rotor speed information meets the design requirements; instructions are sent to the servo motor in sequence according to the set speed points to be tested so that the servo motor drives the rotors on the two output shafts to rotate synchronously; the stator is used to detect the speed information of the rotor, and the speed information of the rotor is converted into an electrical signal to form a characteristic waveform; the characteristic waveforms of the two rotors are compared to see if they are consistent. If they are consistent, the characteristic waveforms of the two rotors are output. Otherwise, it is determined that an abnormality occurs in the test, and the cause of the abnormality is checked based on the abnormality.

[0015] In some embodiments, after comparing the characteristic waveforms of the two rotors to see if they are consistent, and if so, outputting the characteristic waveforms of the two rotors, the testing method further includes: comparing the characteristic waveforms of the two rotors with the design standard values ​​to determine whether the characteristic waveforms of the two rotors meet the design requirements. If so, the eddy current speed sensor is judged to have passed the factory inspection, otherwise it is judged to be an unqualified product.

[0016] In some embodiments, instructions are sent to the servo motor in sequence according to the set speed points to be measured, so that the servo motor drives the rotors on the two output shafts to rotate synchronously, and then the current rotor rotation is timed to determine whether the technology reaches the set time; if so, the next speed stage is carried out; otherwise, the rotor is continued to be controlled to rotate according to the current speed point until the design time requirement is reached.

[0017] In some embodiments, after determining that the eddy current speed sensor has passed the factory inspection, the testing method further includes: taking the characteristic waveform of the rotor as input, and using a data acquisition card to simulate and generate the characteristic waveform of the eddy current speed sensor at a set speed based on the input.

[0018] The beneficial effects of the technical solution provided by this application include: The embodiment of the present application provides an eddy current speed sensor testing device and method. Since the right-angle commutator is connected through a servo motor, first of all, the servo motor housing has high-precision speed control capability, and can maintain stable speed output regardless of low speed or high speed conditions. In addition, the servo motor can drive the right-angle commutator to test the rotors of two sets of eddy current speed sensors at the same time, which not only directly improves the test efficiency, but also collects the characteristic waveforms generated by the two sets of eddy current speed sensors. The two sets of eddy current speed sensors will generate two corresponding sets of characteristic waveforms at each speed. The frequency, amplitude, and phase of the two sets of characteristic waveforms are compared with the design standard values. If the deviation between the above parameters and the standard values ​​is within the tolerance range, it can be determined whether the functions of the two sets of eddy current speed sensors can pass the factory inspection. If qualified, it provides a test basis for the subsequent extremely high speed conditions. There is no need to worry about the actual output speed accuracy not meeting the requirements and causing an impact. On the contrary, the product problems can be fed back through comparison in the basic test link, and adjustments can be made in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present application; Figure 2 A schematic top view of an embodiment of the present application; Figure 3 A schematic cross-sectional view of an embodiment of the present application; In the figure: 1. Servo motor; 2. Right-angle commutator; 20. Drive shaft; 21. Output shaft; 22. Bevel gear set; 3. Rotor; 4. Bracket; 40. Mounting hole; 41. Waist-shaped hole; 42. Bolt; 5. Stator; 50. Plug terminal; 6. Separation gap; 7. Base plate; 8. Connecting block; 80. Locking piece; 81. Top screw; 82. Step portion; 83. Bushing; 84. Fixing nut; 9. Protective cover. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] The embodiments of the present application provide an eddy current speed sensor testing device and method, which can solve the problem in the related art that when the eddy current speed sensor operates at different speeds, especially under long-cycle and extremely high speed conditions, it is difficult to collect the characteristic waveforms generated by the rotor.

[0023] Example 1 refer to Figures 1 to 3 The embodiment of the present application provides an eddy current speed sensor test device, which includes: a servo motor 1, a right-angle commutator 2 and a bracket 4. The right-angle commutator 2 includes a drive shaft 20 and two output shafts 21, wherein the drive shaft 20 is connected to the servo motor 1, and the two output shafts 21 are used to connect to the rotor 3; the designed bracket 4 is connected to one end of the rotor 3, and a mounting hole 40 is provided on the bracket 4, which is used to connect the stator 5 through the mounting hole 40, and a separation gap 6 is provided between the stator 5 and the rotor 3. The stator 5 is used to detect the speed information of the rotor 3 and convert the speed information of the rotor 3 into an electrical signal to form a characteristic waveform.

[0024] In this application, a servo motor 1 provides power, driving the drive shaft 20 of the right-angle commutator 2. The drive shaft 20 and the output shaft 21 are matched via a bevel gear set 22. The right-angle commutator 2 transmits power to the two output shafts 21, which are connected to the rotor 3, thereby driving the rotation of the rotor 3. A bracket 4 is connected to one end of the rotor 3 and is connected to the stator 5 through the mounting hole 40 on the bracket 4. A separation gap 6 is ensured between the stator 5 and the rotor 3. When the rotor 3 rotates, the stator 5 detects the speed information of the rotor 3 and converts it into an electrical signal to form a characteristic waveform.

[0025] In the present application, the servo motor 1 can always maintain a high degree of consistency with the preset speed under various working conditions, with minimal speed deviation, and the servo motor 1 has a wide speed range, can smoothly accelerate from a low speed to a high speed, and maintain the stability and accuracy of the speed in this process. However, in the related art, the DC brushless motor has low speed accuracy and large speed deviation in actual use. Although the stepper motor can accurately control the step angle through a pulse signal, it has limitations in speed control. Its maximum speed is low, and when an eddy current speed sensor is required to be tested at an extremely high speed, it may be necessary to frequently change the speed of the motor to simulate different working conditions. Therefore, the dynamic response capabilities of the DC brushless motor and the stepper motor are poor, and when the speed changes, it takes a long time to reach a new stable speed. The servo motor 1 used in this application has undergone rigorous quality inspection and reliability testing and has high reliability and stability.

[0026] In addition, the servo motor 1 designed in this application can simultaneously drive the rotor 3 of two sets of eddy current speed sensors to rotate through the right-angle commutator 2, which not only realizes the synchronous testing of multiple sensors and improves the efficiency of the test, but also the two sets of eddy current speed sensors will generate two corresponding sets of characteristic waveforms at each speed. The characteristic waveforms include parameters such as frequency, amplitude, and phase. These parameters are compared with the design standard values, and the function of the eddy current speed sensor is judged to be able to pass the factory inspection based on whether the deviation is within the tolerance range. If the parameter deviation is within the tolerance range, it means that the sensor function is qualified, which provides a reliable basis for subsequent testing under extremely high speed conditions; if it is unqualified, the product problem can be fed back in time in the basic test link, which is convenient for timely adjustment and improvement in the production process, improving product quality, and reducing the flow of unqualified products into the market.

[0027] Therefore, this application can accurately test the eddy current sensor through the improvement of the servo motor 1 and the right-angle commutator 2, ensuring that the eddy current sensor shipped from the factory can meet the use requirements, and even when the eddy current speed sensor operates at different speeds, especially under long-term and extremely high speed conditions, it can effectively collect the characteristic waveform generated by the rotor 3.

[0028] In this application, a protective cover 9 is installed between the two brackets 4. The protective cover 9 has loose-leaf flaps on both sides. It is closed during testing and can be quickly opened after testing is completed, facilitating the removal of the stator 5 fixture. A threading hole is also reserved to facilitate the wiring of the eddy current speed sensor harness. The protective cover 9 provides safety during testing.

[0029] In the present application, it is also found that the separation gap 6 directly affects the accuracy of the speed characteristic waveform output by the eddy current speed sensor. This is because the eddy current speed sensor works based on the eddy current effect. When the alternating magnetic field approaches the rotor 3, eddy currents will be generated inside the rotor 3. The size of the separation gap 6 between the stator 5 and the rotor 3 directly affects the degree of coupling between the alternating magnetic field and the rotor 3. If the gap is too large, the intensity of the alternating magnetic field will be weakened when it reaches the surface of the rotor 3, resulting in a decrease in the intensity of the eddy current generated, resulting in an uneven distribution of eddy currents on the surface of the rotor 3, causing deviations in the signal detected by the sensor; on the contrary, if the gap is too small, although the eddy current intensity may increase, it may cause other problems, such as too tight magnetic field coupling, resulting in signal distortion, which also affects the measurement accuracy. Therefore, after multiple tests and analyses, the present application found that when the separation gap 6 is 1.2mm-2.0mm, the accuracy of the output speed characteristic waveform is higher.

[0030] In this application, in order to facilitate adjustment of the size of the separation gap 6, the disclosed test device also includes a base plate 7. A waist-shaped hole 41 is provided on the bracket 4, and then a bolt 42 is connected to the bracket 4. The rod of the bolt 42 is passed through the waist-shaped hole 41 and threadedly engaged with the base plate 7. Therefore, by moving the bracket 4 on the base plate 7 along the waist-shaped hole 41, the test device can be installed on the experimental platform through the base plate 7. Then, a dedicated gap ruler is used to measure the size of the separation gap 6. If it is within the set range, the bolt 42 is tightened.

[0031] To further improve the adjustment accuracy of the separation gap 6, it is first necessary to ensure that the rotor 3 is effectively connected to the output shaft 21. Specifically, a connecting block 8 is movably connected to the output shaft 21, and a locking member 80 is provided on the connecting block 8. The locking member 80 includes but is not limited to a small push screw. The locking member 80 is used to lock the connecting block 8 to the output shaft 21. During installation, the rotor 3 is connected to the connecting block 8. At this time, the small push screw only serves to pre-connect the connecting block 8 and the output shaft 21 and is not tightened. In addition, a push screw 81 is threadedly connected to the tail end of the connecting block 8. The push screw 81 is used to abut the output shaft 21. When the size of the separation gap 6 only needs to be fine-tuned, the push screw 81 is turned to abut the output shaft 21. The output shaft 21 is symmetrically arranged, and the bracket 4 does not move. Therefore, the connecting block 8 will move relative to the output shaft 21. At this time, a dedicated gap scale will test whether the separation gap 6 meets the design requirements. If it does, the locking member 80 is fixed to the connecting block 8. This also achieves a stable installation of the rotor 3 and ensures its reliable use.

[0032] In the present application, in order to achieve the installation of the rotor 3 and the connecting block 8, a step portion 82 is provided on the connecting block 8, and then the rotor 3 is mounted on the step portion 82. A fixing assembly is provided on the connecting block 8, and the fixing assembly is used to lock the rotor 3 on the step portion 82 and make it tightly abut the side wall of the step portion 82. The fixing assembly includes: a bushing 83 and a fixing nut 84. The bushing 83 is connected to the connecting sleeve and is located on one side of the rotor 3. The bushing 83 can limit the position of the rotor 3. The connecting block 8 is provided with a threaded section, and the fixing nut 84 cooperates with the threaded section to tightly abut the bushing 83 against the rotor 3. Therefore, when installing the rotor 3, the rotor 3 is first mounted on the step portion 82, and then the bushing 83 limits the position of the rotor 3. The fixing nut 84 is tightened, and the rotor 3 is clamped on the step portion 82, and the structure is reliable.

[0033] In this application, a plug-in terminal 50 is also connected to the stator 5. This plug-in terminal 50 is used to connect to a data acquisition card (not shown). This terminal is used to extract the characteristic waveform of the rotor 3 from the stator 5 and transmit it to the data acquisition card. A data acquisition card is a hardware device used to convert external physical signals into digital signals that can be recognized by a computer. On the one hand, the servo motor 1 drives the drive shaft 20 of the right-angle commutator 2 to rotate. The right-angle commutator 2 transmits power to two output shafts 21, which are connected to the rotor 3, thereby driving the rotor 3 to rotate. As the rotor 3 rotates, the stator 5 detects the rotor 3's speed information and converts it into an electrical signal to form a characteristic waveform. To effectively analyze the characteristic waveform, the plug-in terminal 50 can be used to extract the characteristic waveform of the rotor 3 from the stator 5 and transmit it to the data acquisition card. The data acquisition card collects the characteristic waveform and analyzes the relevant key parameters, thereby automatically evaluating whether the eddy current sensor meets the factory's technical performance requirements. Typically, the speed of the servo motor 1 can be controlled between 100 and 6000 rpm. By analyzing the characteristic waveform of the servo motor's output, the accuracy of the eddy current sensor can be tested and verified before it is applied to a real vehicle. This can prevent damage and failure of the eddy current speed sensor caused by long-term rotation at high speeds.

[0034] Secondly, at high and very high speeds, such as 7000-20000rpm, the stability and reliability of the mechanical fixing and transmission mechanism will be significantly reduced. Therefore, it is not suitable to use the servo motor 1 to drive the rotor 3 to generate high and very high speed characteristic waveforms to supply the electric drive controller with high-speed test conditions. Therefore, in order to further verify the high speed, such as when reaching 20000rpm, the characteristic waveform of the rotor 3 is extracted from the stator 5 and transmitted to the data acquisition card. It can be used to test the performance of the electric drive controller unit under high speed state. Therefore, the stator 5 of this application is connected with a plug-in terminal 50, which leads the characteristic waveform of the rotor 3 from the stator 5 and transmits it to the data acquisition card. The data acquisition card collects the characteristic waveform of the eddy current speed sensor in the stage of 100-6000rpm and analyzes the relevant key parameters. The data acquisition card simulates the characteristic waveform at 20000rpm based on the characteristic waveform in the stage of 100-6000rpm. The data acquisition card has strong anti-interference ability, short scanning measurement cycle, high acquisition accuracy, moderate output amplitude, and flexible programming, which fully guarantees the accuracy and reliability of the speed characteristic waveform output by the eddy current speed sensor.

[0035] Example 2 refer to Figures 1 to 3 In the present application, a method for testing an eddy current speed sensor is provided, and an eddy current speed sensor testing device of the above-mentioned embodiment 1 is provided; specifically, the stator 5 is installed on the bracket 4 and the rotor 3 is connected to the output shaft 21; then the separation gap 6 between the rotor 3 and the stator 5 is adjusted so that the error of the stator 5 detecting the speed information of the rotor 3 meets the design requirements, that is, the separation gap 6 is between 1.2-2.0mm; then, instructions are sent to the servo motor 1 in sequence according to the set speed point to be tested, so that the servo motor 1 drives the rotor 3 on the two output shafts 21 to rotate synchronously. The set speed point can be selected from 500rpm, 1000rpm, 2000rpm~6000rpm.

[0036] The servo motor 1 is started at a set speed point. The servo motor 1 provides power to drive the drive shaft 20 of the right-angle commutator 2 to rotate. The drive shaft 20 and the output shaft 21 are matched through the bevel gear set 22. The right-angle commutator 2 transmits power to the two output shafts 21. The output shaft 21 is connected to the rotor 3, thereby driving the rotor 3 to rotate. The bracket 4 is connected to one end of the rotor 3 and connected to the stator 5 through the mounting hole 40 on the bracket 4. The stator 5 is ensured to have a separation gap 6 between the stator 5 and the rotor 3. When the rotor 3 rotates, the stator 5 is used to detect the speed information of the rotor 3 and convert the speed information of the rotor 3 into an electrical signal to form a characteristic waveform. The characteristic waveforms of the two rotors 3 are then compared to see if they are consistent. If they are consistent, the characteristic waveforms of the two rotors 3 are output. Otherwise, if the test is abnormal, the cause of the abnormality is checked based on the abnormality. The abnormality may be that the connection of the rotor 3 is disconnected, or the quality of the rotor 3 and stator 5 products themselves is unqualified. In this way, the defects in the test can be technically discovered in the initial stage and timely adjustments can be made.

[0037] If the characteristic waveform of a set of eddy current sensors is tested separately, it is not easy to find problems with a single set of eddy current sensors in the initial stage of testing. Therefore, the testing method of the present application can ensure the accuracy of the eddy current sensor, accurately collect the characteristic waveform, and detect problems in advance by ensuring the installation accuracy of the stator 5 and the rotor 3 and the reliability of the equipment operation.

[0038] Specifically, after comparing the characteristic waveforms of the two rotors 3 to see if they are consistent, if they are consistent, then outputting the characteristic waveforms of the two rotors 3, the test method further includes: comparing the characteristic waveforms of the two rotors 3 with the design standard values ​​to determine if the characteristic waveforms of the two rotors 3 meet the design requirements. If they do, then the eddy current speed sensor is determined to have passed the factory inspection, otherwise it is determined to be an unqualified product. The design standard value is confirmed based on the product qualification standard and meets the design requirements. The specific parameters include but are not limited to frequency, amplitude, and phase. When the characteristic waveforms of the two rotors 3 meet the design requirements, that is, the deviation between the above parameters and the standard values ​​is within the tolerance range, it can basically be determined whether the functions of the two sets of eddy current speed sensors can pass the factory inspection, which can avoid damage and failure of the eddy current speed sensor caused by long-term rotation at high speed.

[0039] In this application, since the servo motor 1 has a certain buffer stage during its operation, in order to ensure the stable operation of the servo motor 1 and drive the rotor 3 to rotate according to the designed speed point, instructions must be sent to the servo motor 1 in sequence according to the set speed points to be measured, so that the servo motor 1 drives the rotor 3 on the two output shafts 21 to rotate synchronously, and then the current rotation of the rotor 3 is timed to determine whether the technology reaches the set time length; if so, proceed to the next speed stage; otherwise, continue to control the rotor 3 to rotate according to the current speed point until the designed time length requirement is reached.

[0040] Furthermore, after determining that the eddy current speed sensor has passed factory inspection, the testing method further includes: using the characteristic waveform of rotor 3 as input, and using a data acquisition card to simulate and generate the characteristic waveform of the eddy current speed sensor at a set speed based on this input. This includes, but is not limited to, first reading the characteristic waveform generated by the eddy current speed sensor during operation at 100-6000 rpm using the data acquisition card, and then using the data acquisition card to simulate the extremely high-speed characteristic waveform of the eddy current speed sensor at 7000 rpm-20000 rpm through fitting calculation. This simulated waveform can be used for testing the high-speed operating conditions of the electric drive controller unit.

[0041] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0043] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. 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 present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A test device for an eddy current speed sensor, characterized in that: It includes: Servo motor (1); A right-angle commutator (2), comprising a drive shaft (20) and two output shafts (21), wherein the drive shaft (20) is connected to the servo motor (1), and the two output shafts (21) are used to connect to the rotor (3); A bracket (4) is connected to one end of the rotor (3), and a mounting hole (40) is provided on the bracket (4). The mounting hole (40) is used to connect the stator (5), and a separation gap (6) is provided between the stator (5) and the rotor (3). The stator (5) is used to detect the rotation speed information of the rotor (3) and convert the rotation speed information of the rotor (3) into an electrical signal to form a characteristic waveform.

2. The eddy current speed sensor testing device according to claim 1, characterized in that: It also includes a bottom plate (7), a waist-shaped hole (41) is provided on the bracket (4), a bolt (42) is connected to the bracket (4), and the rod of the bolt (42) passes through the waist-shaped hole (41) and is threadedly engaged with the bottom plate (7).

3. The eddy current speed sensor testing device according to claim 2, characterized in that: The output shaft (21) is movably connected to a connecting block (8), and a locking member (80) is provided on the connecting block (8). The locking member (80) is used to lock the connecting block (8) on the output shaft (21). The rotor (3) is connected to the connecting block (8), and the tail end of the connecting block (8) is threadedly connected to a top screw (81), and the top screw (81) is used to abut against the output shaft (21).

4. The eddy current speed sensor testing device according to claim 3, characterized in that: The connecting block (8) is provided with a step portion (82), the rotor (3) is sleeved on the step portion (82), and the connecting block (8) is provided with a fixing assembly, which is used to lock the rotor (3) on the step portion (82) and make it tightly abut against the side wall of the step portion (82).

5. The eddy current speed sensor testing device according to claim 4, characterized in that: The fixing assembly includes: a bushing (83) connected to the connecting sleeve and located on one side of the rotor (3); A fixing nut (84) is provided on the connecting block (8), and the fixing nut (84) cooperates with the threaded section to tighten the bushing (83) and the rotor (3).

6. The eddy current speed sensor testing device according to claim 1, characterized in that: The stator (5) is connected to a plug-in terminal (50), which is used to connect to a data acquisition card. The plug-in terminal (50) is used to lead the characteristic waveform of the rotor (3) from the stator (5) and transmit it to the data acquisition card.

7. A method for testing an eddy current speed sensor, characterized in that: Providing an eddy current speed sensor testing device according to any one of claims 1 to 6; Mounting the stator (5) on the bracket (4) and connecting the rotor (3) to the output shaft (21); Adjusting the separation gap (6) between the rotor (3) and the stator (5) so that the error of the stator (5) detecting the speed information of the rotor (3) meets the design requirements; Sending instructions to the servo motor (1) in sequence according to the set speed points to be measured, so that the servo motor (1) drives the rotors (3) on the two output shafts (21) to rotate synchronously; Using the stator (5) to detect the rotation speed information of the rotor (3), and converting the rotation speed information of the rotor (3) into an electrical signal to form a characteristic waveform; Compare the characteristic waveforms of the two rotors (3) to see if they are consistent. If they are consistent, output the characteristic waveforms of the two rotors (3). Otherwise, if it is determined that an abnormality occurs during the test, check the cause of the abnormality based on the abnormality.

8. The eddy current speed sensor testing method according to claim 7, wherein: Comparing whether the characteristic waveforms of the two rotors (3) are consistent, and if consistent, outputting the characteristic waveforms of the two rotors (3), the test method further comprises: comparing the characteristic waveforms of the two rotors (3) with design standard values, judging whether the characteristic waveforms of the two rotors (3) meet the design requirements, and if so, judging that the eddy current speed sensor has passed the factory inspection, otherwise judging that it is an unqualified product.

9. The method for testing an eddy current speed sensor according to claim 7, wherein: Sending instructions to the servo motor (1) in sequence according to the set speed points to be measured, so that the servo motor (1) drives the rotors (3) on the two output shafts (21) to rotate synchronously, timing the current rotation of the rotor (3), and judging whether the technology reaches the set time; If yes, proceed to the next speed stage; Otherwise, the rotor (3) is continuously controlled to rotate at the current speed point until the design time requirement is reached.

10. The eddy current speed sensor testing method according to claim 8, wherein: After determining that the eddy current speed sensor has passed the factory inspection, the test method further comprises: taking the characteristic waveform of the rotor (3) as input, and using a data acquisition card to simulate and generate the characteristic waveform of the eddy current speed sensor at a set speed based on the input.

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