Performance test system and method for limited angle torque motor

Abstract

The invention relates to a limited angle torque motor performance test system and method. The system comprises a workbench, a torque measuring device, a bracket and an angle adjusting device, wherein the angle adjusting device comprises a fixed part and a rotating part which are connected with each other; the bracket and the fixed part of the angle adjusting device are fixed on the surface of the workbench, the torque measuring device is fixed on the bracket, and in a working state, the torque measuring device can be rigidly connected with an output shaft of a limited angle torque motor to be measured and is used for measuring the torque output by the output shaft; a shell of a limited angle torque motor to be measured can be arranged on the rotating part of the angle adjusting device, and the shell can rotate along with the rotation of the rotating part. By adopting the system, the accuracy of a test result can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor performance testing, and in particular to a performance testing system and method for a limited angle torque motor. Background Art

[0002] With the development of motor technology, limited angle torque motor technology has emerged, which has high power density and can provide large torque and power in a small volume and mass, meeting the application requirements with strict requirements on weight and space. In addition, it also has excellent dynamic performance, can respond quickly and has high conversion speed, which is very suitable for systems that require fast and precise control.

[0003] It should be noted that in order to ensure that limited-angle torque motors can operate efficiently, safely and reliably in various applications, they need to be performance tested.

[0004] In traditional technology, such as Figure 1 As shown, the performance test is performed using a torque ruler and an electronic scale, but the test results obtained using this test method are less accurate and cannot accurately reflect the performance of the limited angle torque motor. Summary of the invention

[0005] Based on this, it is necessary to provide a performance testing system and method for a limited angle torque motor that can test accuracy in response to the above technical problems.

[0006] In a first aspect, the present application provides a performance test system for a limited angle torque motor, the system comprising: a workbench, a torque measuring device, a bracket, and an angle adjustment device, the angle adjustment device comprising a fixed part and a rotating part connected to each other;

[0007] The bracket and the fixing part of the angle adjustment device are fixed on the table surface of the workbench, and the torque measuring device is fixed on the bracket. In the working state, the torque measuring device can be rigidly connected to the output shaft of the limited angle torque motor to be measured, and is used to measure the torque output by the output shaft. The shell of the limited angle torque motor to be measured can be installed on the rotating part of the angle adjustment device, and the shell can rotate with the rotation of the rotating part.

[0008] In one embodiment, the rotating part is a chuck, and the chuck includes a body and a claw disposed on the body;

[0009] The main body is fixed on the fixing part, and the shell can be installed on the claw.

[0010] In one embodiment, the fixing portion is a dividing head.

[0011] In one embodiment, the system further comprises a direct current power supply;

[0012] The DC power supply is electrically connected to the limited angle torque motor via a power line, and is used to drive the limited angle torque motor.

[0013] In one of the embodiments, the torque measuring device includes a stopper kit, a torque sensor fixed in the stopper kit;

[0014] The stopper kit is fixed on the bracket, the stopper kit is rigidly connected to the output shaft, and the torque sensor is used to collect the torque output by the output shaft.

[0015] In one of the embodiments, the stop kit includes a coupling, a stop shaft and a stop assembly;

[0016] One end of the coupling is rigidly connected to the output shaft, and the other end of the coupling is rigidly connected to the stop shaft. The stop shaft is fixedly connected to the stop assembly, and the stop assembly is fixed on the bracket.

[0017] In one embodiment, the system further comprises a torque display;

[0018] The torque display is connected to the torque sensor through a signal line for displaying the torque. In a second aspect, the present application also provides a performance test method for a limited angle torque motor, which is applied to the system as described above, and the method includes:

[0019] Installing the limited angle torque motor to be tested on the system to complete the test preparation and setting;

[0020] Start testing, and perform N rounds of testing on the limited angle torque motor; wherein N is a natural number, and N≥2;

[0021] The process of each round of testing is as follows:

[0022] The fixed part is operated to rotate the rotating part to change the relative position of the stator and the rotor of the limited angle torque motor, and the limited angle torque motor is powered on after reaching the angle to be measured, and the torque output by the torque measuring device is recorded, and the power is turned off;

[0023] Among them, the angle to be tested corresponding to each round of testing is different.

[0024] In one embodiment, the test preparation includes:

[0025] Fixing the housing of the limited angle torque motor on the rotating part of the angle adjustment device, and locking the output shaft of the limited angle torque motor through the torque measuring device;

[0026] Start calibrating the mechanical zero position and electromagnetic zero position of the limited angle torque motor, operate the fixed part to make the rotating part rotate in one direction until the torque output by the torque measuring device is 0, set the current relative position of the stator and the rotor as the mechanical zero position, and based on the mechanical zero position, calculate the electromagnetic zero position through the conversion formula of mechanical zero position and electromagnetic zero position to complete the calibration.

[0027] In one embodiment, the process of calibrating the electromagnetic zero position of the limited angle torque motor further includes:

[0028] The fixed part is operated to make the rotating part continue to rotate, so as to complete the calibration of the electromagnetic zero position;

[0029] After the calibration is completed, it also includes:

[0030] The relative positions of the stator and the rotor are reset to the mechanical zero position.

[0031] The above-mentioned limited angle torque motor performance testing system and method measures the torque output by the output shaft of the limited angle torque motor to be tested through a torque measuring device, the torque measuring device is rigidly connected to the output shaft, and the torque measuring device is fixed on a bracket, and the bracket is fixed on the table top of the workbench, which further ensures the rigidity of the system, thereby improving the accuracy of the test results, and further being able to accurately reflect the performance of the limited angle torque motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a test system in traditional technology;

[0034] Figure 2 A comparison chart of the test results of the continuous stall test method and the test results of the intermittent power-on test method in one embodiment;

[0035] Figure 3 The figure is a relative position diagram of the stator and rotor of a limited angle torque motor;

[0036] Figure 4 A structural diagram of a limited angle torque motor installed in a performance testing system in one embodiment;

[0037] Figure 5It is a flowchart of the intermittent power-on test method in one embodiment.

[0038] Description of reference numerals:

[0039] 1. Dividing head; 2. Chuck; 3. Limited angle torque motor; 4. Coupling; 5. Torque measuring device; 6. L-shaped bracket; 7. Torque display; 8. DC power supply; 9. Workbench; 10. Stator; 11. Rotor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the characteristics and application fields of the limited angle torque motor are described in detail below.

[0041] Limited-angle torque motors have shown great development potential in modern industry and aerospace due to their unique advantages and broad application prospects. Electric actuators directly driven by limited-angle torque motors are gradually replacing traditional hydraulic and pneumatic actuators, becoming a new application trend of actuators in industrial automation and aerospace fields.

[0042] For example, it is used in aircraft flight control systems, automatic control of air conditioning and exhaust gas circulation systems, variable valve timing systems of internal combustion engines, etc. Especially in the field of aerospace, the application of limited angle torque motors has become an important research topic, and has broad application prospects in advanced aircraft such as more electric aircraft, drones, missiles and satellites.

[0043] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] As mentioned in the background technology, the performance test is performed by using a torque ruler and an electronic scale, but the test results obtained using this test method are less accurate and cannot accurately reflect the performance of the limited angle torque motor. This test method has made some improvements over the wire wheel method in the currently commonly used national standard GJB 2822-97.

[0045] Among them, the performance test refers to testing the torque output by the limited angle torque motor through the output shaft after the rotor (i.e., the output shaft) of the limited angle torque motor is rotated a certain angle relative to the stator (at least including the housing), and the limited angle torque motor is at a measured angle. At the measured angle and when powered on, the limited angle torque motor is at a measured angle.

[0046] The angle to be measured is generally a plurality of mutually symmetrical angles on both sides of the electromagnetic zero position, such as -2° and 2°, -4° and 4°, etc. The direction can be defined as clockwise rotation is positive, and counterclockwise rotation is negative. The electromagnetic zero position refers to the point where the center line of the magnetic steel (constituting the rotor) coincides with the center line of the stator slot. There are generally multiple electromagnetic zero positions for a limited angle torque motor. For different limited angle torque motors, the angle to be measured may be different.

[0047] Among them, the wire wheel method has many disadvantages in specific operation, the most prominent of which are the test error caused by the poor rigidity of the rope and the operational inconvenience caused by the non-continuous adjustment of the hanging weight (weight).

[0048] The applicant found that although the performance test using the torque ruler and electronic scale has improved the problems of poor system rigidity and inconvenient operation to a certain extent, the solution of limiting the output shaft of the limited angle torque motor by the table of the electronic scale has the disadvantage of poor stability. This disadvantage is caused by the insufficient rigidity of the torque ruler and the electronic scale itself, which increases the intermediate cumulative error. The reason for the intermediate cumulative error is that the reaction force of the electronic scale and the arm of the torque ruler cannot be vertical. The reason for the inability to be vertical is that it is difficult to make it vertical during the test preparation process, and the electronic scale table will sink after being stressed. In one example, the angle between the table of the electronic scale and the torque ruler reaches 3°.

[0049] In order to solve the problem of insufficient rigidity, in an exemplary embodiment, a performance testing system for a limited angle torque motor is provided, which measures the torque output by the output shaft of the limited angle torque motor to be tested through a torque measuring device, the torque measuring device is rigidly connected to the output shaft, and the torque measuring device is fixed on a bracket, and the bracket is fixed on the table top of the workbench, further ensuring the rigidity of the system, thereby improving the accuracy of the test results, and further being able to accurately reflect the performance of the limited angle torque motor.

[0050] In addition, it should be noted that when the performance test is performed using a torque ruler and an electronic scale, after recording the weight displayed on the electronic scale, it is necessary to convert the torque using the conversion formula between weight and torque, thus increasing the workload during the test. In the embodiment of the present application, the torque can be directly obtained by the torque measuring device without conversion, thereby improving the efficiency of the test.

[0051] In addition, when the moment ruler acts on the table of the electronic scale, it acts on a small area of ​​the table, resulting in uneven force on the table, so that there is an error between the weight measured by the electronic scale and the actual weight output by the moment ruler, and the error increases with the increase of the actual weight. In the embodiment of the present application, the method of directly obtaining the torque through the torque measuring device does not have this error, so that the accuracy of the test result is further improved.

[0052] In addition, the tools and equipment used in this system are very economical, easy to operate and highly reliable.

[0053] The system includes a workbench, a torque measuring device, a bracket, and an angle adjustment device, wherein the angle adjustment device includes a fixed part and a rotating part connected to each other;

[0054] The bracket and the fixing part of the angle adjustment device are fixed on the table surface of the workbench, and the torque measuring device is fixed on the bracket. In the working state, the torque measuring device can be rigidly connected to the output shaft of the limited angle torque motor to be measured, and is used to measure the torque output by the output shaft. The shell of the limited angle torque motor to be measured can be installed on the rotating part of the angle adjustment device, and the shell can rotate with the rotation of the rotating part.

[0055] The tester can rotate the rotating part to a desired angle by operating the fixing part, for example, the desired angle is 2°, 3°, etc.

[0056] Among them, the bracket can be an "L"-shaped bracket, a triangular bracket, etc.

[0057] In one embodiment, when testing through the system, the limited angle torque motor to be tested is installed in the system, and the test preparation settings are completed. The test is started, the limited angle torque motor is continuously powered, and the rotating part is rotated to a desired angle by operating the fixed part, thereby changing the relative position of the stator and the rotor, that is, changing the relative position of the housing and the output shaft to form a certain angle, so that the angle reaches each angle to be tested in turn. The torque at each angle to be tested is recorded respectively, thereby completing the test.

[0058] It should be noted that the test method used in this embodiment is a continuous stall test method. The power-on time of this method far exceeds the power-on time of the limited angle torque motor in actual use, and will cause the motor to heat up severely, resulting in inaccurate measured data. In severe cases, it will cause irreversible damage to the limited angle torque motor.

[0059] Among them, the reason why the data is inaccurate due to severe heating is that the output power of the limited angle torque motor is reduced due to increased impedance and weakened magnetism of the permanent magnet.

[0060] In order to solve this problem, in another embodiment, when the system is tested, the limited angle torque motor to be tested is installed in the system to complete the test preparation settings. The test is started, and the limited angle torque motor is tested for N rounds; wherein N is a natural number, and N≥2; wherein the process of each round of testing is:

[0061] The fixed part is operated to rotate the rotating part to change the relative position of the stator and the rotor. After reaching the angle to be measured, the limited angle torque motor is powered on, and the torque output by the torque measuring device is recorded, and the power is turned off. The angle to be measured corresponding to each round of testing is different.

[0062] That is, in this embodiment, the test is performed in an intermittent power-on manner, that is, in each round of testing for each angle to be measured, the angle is first adjusted to the angle to be measured, and then the power is turned on. And after recording the torque output by the torque measuring device, the power is turned off, and the power is turned on again in the next round of testing. Therefore, the test method provided in this embodiment greatly reduces the power-on time of the limited angle torque motor during the test process, which is closer to the power-on time of the motor in actual use, thereby avoiding serious heating of the motor, making the measured data more accurate, and reducing the risk of damage to the motor due to long-term stalling.

[0063] For example, after a performance test of a limited angle torque motor, the temperature of the motor was reduced by about 50°C in the intermittent power-on mode compared to the continuous stall mode. Figure 2 As shown in the figure, compared with the intermittent energization, the maximum error of the data measured by continuous stall is as high as 13%.

[0064] Furthermore, the test preparation includes: fixing the housing of the limited angle torque motor on the rotating part of the angle adjustment device, locking the output shaft of the limited angle torque motor through the torque measuring device; starting to calibrate the mechanical zero position and electromagnetic zero position of the limited angle torque motor, operating the fixing part to rotate the rotating part in one direction until the torque output by the torque measuring device is 0, setting the current relative position of the stator and the rotor as the mechanical zero position, and based on the mechanical zero position, calculating the electromagnetic zero position through the conversion formula of the mechanical zero position and the electromagnetic zero position to complete the calibration.

[0065] Among them, for a limited angle torque motor, if Figure 3 As shown, the stator 10 has a stator slot for installing the coil, the stator teeth are between the two stator slots, and the rotor 11 has a plurality of magnetic steels. It can be seen that the angle between the mechanical zero position and the electromagnetic zero position is fixed, and specifically the angle is related to the number of motor poles. The conversion formula is as follows:

[0066]

[0067] Among them, α is the angle and p is the number of motor poles.

[0068] When the stator of the limited angle torque motor stays at the mechanical zero position, the limited angle torque motor does not output torque to the outside.

[0069] In one embodiment, the calibration is completed after the electromagnetic zero position is calculated.

[0070] In another embodiment, after the electromagnetic zero position is calculated, the electromagnetic zero position is checked to ensure the accuracy of the electromagnetic zero position and further determine the accuracy of the test result. That is, in the process of calibrating the electromagnetic zero position of the limited angle torque motor, it is also necessary to operate the fixed part to make the rotating part continue to rotate to complete the electromagnetic zero position verification; after the calibration is completed, the relative position of the stator and the rotor can be reset to the mechanical zero position, or the motor can be stopped at the electromagnetic zero position to facilitate subsequent testing.

[0071] After completing the test, turn off the power and remove the FAT motor from the system.

[0072] For example, the rotating part is a chuck, which includes a body and a claw disposed on the body; the body is fixed to the fixed part by screws, bolts, etc., and a shell can be installed on the claw. Of course, the rotating part can also be other customized workpieces as long as the function of the rotating part can be realized.

[0073] Exemplarily, the fixing part is a dividing head. The dividing head can change the relative position to a desired angle more accurately. Of course, the fixing part can also be other devices, such as a stepping motor.

[0074] Exemplarily, the system further includes a DC power supply; the DC power supply is electrically connected to the limited angle torque motor through a power line, and is used to drive the limited angle torque motor. Specifically, the output end of the DC power supply is connected to the input end of the limited angle torque motor through the power line. Of course, the limited angle torque motor can also be powered by other methods or devices as long as the purpose of power supply can be achieved.

[0075] Exemplarily, the torque measuring device includes a stop kit and a torque sensor fixed in the stop kit; the stop kit is fixed on a bracket, the stop kit is rigidly connected to the output shaft, and the torque sensor is used to collect the torque output by the output shaft.

[0076] In one embodiment, the output shaft may directly cooperate with the stop kit, for example, the stop kit may have a claw, a stop screw, and the like.

[0077] In another embodiment, the stop kit includes a coupling, a stop shaft and a stop assembly; one end of the coupling is rigidly connected to the output shaft, the other end of the coupling is rigidly connected to the stop shaft, the stop shaft is fixedly connected to the stop assembly, and the stop assembly is fixed to the bracket by screws, bolts, etc.

[0078] Among them, the stop shaft and the stop assembly can be respectively provided with through holes, and the stop assembly has a stop pin. The purpose of stopping can be achieved by the stop pin penetrating the stop shaft and the stop assembly respectively and having an interference fit with the stop shaft.

[0079] Exemplarily, in order to facilitate recording of torque, the system also includes a torque display; the torque display is communicatively connected to the torque sensor via a signal line for displaying the torque.

[0080] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 4 , Figure 5 and one Optional embodiments are provided to further describe the present application in detail.

[0081] like Figure 4 As shown, a performance test system after the limited angle torque motor 3 to be tested is installed is provided, including a dividing head 1, a chuck 2, a coupling 4, a torque measuring device 5, an L-shaped bracket 6, a torque display 7, a DC (Direct Current) power supply 8 and a workbench 9.

[0082] Among them, the dividing head 1 is fixed to the table top of the workbench 9 by screws; the chuck 2 is fixed to the dividing head 1 by screws; the limited angle torque motor 3 is fixed by the claws on the chuck 2, and the limited angle torque motor 3 is connected to the output end of the DC power supply 8 through a power cord; the L-shaped bracket 6 is fixed to the table top of the workbench 9 by screws; the torque measuring device 5 is fixed to the L-shaped bracket 6 by screws, and is connected to the torque display 7 through a signal line, wherein the torque measuring device 5 includes a torque tester.

[0083] like Figure 5 As shown, a performance test method for a limited angle torque motor is provided, which is applied to Figure 4 In the system, the limited angle torque motor 3 is fixed and locked by the chuck 2, and the output shaft of the limited angle torque motor 3 is locked by the torque measuring device 5. The hand-cranked dividing head 1 can change the relative position between the stator 10 and the rotor 11 of the limited angle torque motor 3. The specific test steps are as follows:

[0084] Step 1: fix the limited angle torque motor 3 on the chuck 2, and lock the output shaft of the limited angle torque motor 3 through the torque measuring device 5.

[0085] Step 2, calibrate the mechanical zero position and electromagnetic zero position. Adjust the relative position of the stator 10 and the rotor 11 in one direction through the dividing head 1. When the torque display 7 returns to zero, the relative position is the mechanical zero position (at this time, the center line of the magnetic steel coincides with the neutral line of the stator tooth, and the tooth slot torque at this position is 0); the mechanical zero position can be converted to the electromagnetic zero position according to the conversion formula. Since the main operating range of the limited angle torque motor 3 is on both sides of the electromagnetic zero position (the center line of the magnetic steel coincides with the center line of the stator slot), the angle of each position can be calibrated with the electromagnetic zero position, where clockwise is positive and vice versa. Check the electromagnetic zero position.

[0086] Step 3, resetting the rotor 11 and stopping the rotor 11 at the mechanical zero position.

[0087] Step 4, start the test. The hand-cranked dividing head 1 changes the relative position of the stator 10 and the rotor 11, and when a certain angle to be measured is reached, the power is turned on, and after the value on the torque display 7 is read, the output of the DC power supply 8 is immediately cut off.

[0088] Step 5, repeat the operation of step 4 until the test of all the angles to be measured is completed;

[0089] Step 6, cut off the power supply of all devices and remove the limited angle torque motor 3.

[0090] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A performance test system for a limited angle torque motor, characterized in that: The system comprises: a workbench, a torque measuring device, a bracket, and an angle adjustment device, wherein the angle adjustment device comprises a fixed part and a rotating part connected to each other; The bracket and the fixing part of the angle adjustment device are fixed on the table surface of the workbench, and the torque measuring device is fixed on the bracket. In the working state, the torque measuring device can be rigidly connected to the output shaft of the limited angle torque motor to be measured, and is used to measure the torque output by the output shaft. The shell of the limited angle torque motor to be measured can be installed on the rotating part of the angle adjustment device, and the shell can rotate with the rotation of the rotating part.

2. The system according to claim 1, characterized in that The rotating part is a chuck, and the chuck includes a body and a claw arranged on the body; The main body is fixed on the fixing part, and the shell can be installed on the claw.

3. The system according to claim 2, characterized in that The fixing part is a dividing head.

4. The system according to claim 1, characterized in that The system also includes a DC power supply; The DC power supply is electrically connected to the limited angle torque motor via a power line, and is used to drive the limited angle torque motor.

5. The system according to claim 1, characterized in that The torque measuring device comprises a stopper kit and a torque sensor fixed in the stopper kit; The stopper kit is fixed on the bracket, the stopper kit is rigidly connected to the output shaft, and the torque sensor is used to collect the torque output by the output shaft.

6. The system according to claim 5, characterized in that The stop kit includes a coupling, a stop shaft and a stop assembly; One end of the coupling is rigidly connected to the output shaft, and the other end of the coupling is rigidly connected to the stop shaft. The stop shaft is fixedly connected to the stop assembly, and the stop assembly is fixed on the bracket.

7. The system according to claim 5, characterized in that The system also includes a torque display instrument; The torque display is connected to the torque sensor through a signal line for displaying the torque.

8. A performance test method for a limited angle torque motor, characterized in that: Applied to the system according to any one of claims 1 to 7, the method comprises: Installing the limited angle torque motor to be tested on the system to complete the test preparation and setting; Start testing, and perform N rounds of testing on the limited angle torque motor; wherein N is a natural number, and N≥2; The process of each round of testing is as follows: The fixed part is operated to rotate the rotating part to change the relative position of the stator and the rotor of the limited angle torque motor, and the limited angle torque motor is powered on after reaching the angle to be measured, and the torque output by the torque measuring device is recorded, and the power is turned off; Among them, the angle to be tested corresponding to each round of testing is different.

9. The method according to claim 8, characterized in that The test preparation includes: Fixing the housing of the limited angle torque motor on the rotating part of the angle adjustment device, and locking the output shaft of the limited angle torque motor through the torque measuring device; Start calibrating the mechanical zero position and electromagnetic zero position of the limited angle torque motor, operate the fixed part to make the rotating part rotate in one direction until the torque output by the torque measuring device is 0, set the current relative position of the stator and the rotor as the mechanical zero position, and based on the mechanical zero position, calculate the electromagnetic zero position through the conversion formula of mechanical zero position and electromagnetic zero position to complete the calibration.

10. The method according to claim 9, characterized in that The process of calibrating the electromagnetic zero position of the limited angle torque motor also includes: The fixed part is operated to make the rotating part continue to rotate, so as to complete the calibration of the electromagnetic zero position; After the calibration is completed, it also includes: The relative positions of the stator and the rotor are reset to the mechanical zero position.

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