Limited angle motor output torque rapid testing device and method
By designing a test device including a rotating shaft, inertial load, magnetic steel and magnetic angle encoder, combined with the H-bridge driving circuit and data acquisition card, the problem of difficult to quickly test the output torque in a limited angle motor is solved, and efficient testing is achieved under harsh environmental conditions.
Patent Information
- Application Number
- CN202510151659.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-05-27
AI Technical Summary
The prior art is difficult to quickly test its output torque in a limited angle motor, especially under harsh environmental conditions, where traditional torque testing devices cannot be applied and dynamic output torque cannot be tested.
A test device including a test device structure, a motor driving circuit and a data acquisition card are designed. The structure of the test device includes a rotating shaft, inertial load, magnetic steel and magnetic angle encoder. The motor is applied to the pulse voltage through the H-bridge driving circuit, and combined with the industrial control machine to collect and process data, it realizes a rapid test of the motor output torque.
It realizes a rapid test of the output torque of the limited angle motor under environmental conditions such as high and low temperatures and vibrations, which can comprehensively test the motor output torque performance, and the test results can better reflect the output torque of the motor in actual work.
Smart Images
Figure CN120043668A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor testing, and particularly to a device and method for quickly testing the output torque of a limited-rotation-angle motor. Background Art
[0002] The output torque of a limited-rotation-angle motor is an important parameter for measuring the performance of the motor. Especially during the operation of the motor under load in harsh environmental conditions, testing the output torque of the motor is crucial for evaluating the reliability of the motor operation. Since the motor cannot rotate continuously for a full circle, traditional torque testing devices, such as the widely used hysteresis dynamometer, cannot be applied to the testing of limited-rotation-angle motors. Currently, only a torque sensor can be used to test the locked-rotor torque of the motor, while the dynamic output torque of the motor cannot be tested. There is a certain difference between the locked-rotor torque and the actual dynamic output torque of the motor, and this test can only be carried out in a normal environment. Summary of the Invention
[0003] In view of this, the purpose of the present invention is to provide a device and method for quickly testing the output torque of a limited-rotation-angle motor.
[0004] The present invention provides a device for quickly testing the output torque of a limited-rotation-angle motor, characterized in that the testing device comprises a testing device structure, a motor drive circuit, and an industrial control computer equipped with a data acquisition card.
[0005] The testing device structure includes a rotating shaft, an inertial load, a permanent magnet, and a magnetic angle encoder. One end of the rotating shaft is provided with a notch matching the output shaft of the motor to be tested, which transmits the torque output by the motor to the rotating shaft. A permanent magnet is fixed at the other end of the rotating shaft. An inertial load is arranged in the middle section of the rotating shaft. Bearings are installed on the rotating shaft to reduce frictional resistance. The magnetic angle encoder is arranged at a position directly opposite to the permanent magnet, and the permanent magnet is used for the magnetic angle encoder to detect the angle of the rotating shaft.
[0006] Further, the motor drive circuit is an H-bridge drive circuit, which is used to input a pulsed voltage to the motor to drive the motor to be tested to rotate. By inputting different timing pulses to the motor drive circuit, the forward and reverse rotation of the motor is controlled. By applying different input voltages to the motor drive circuit, pulsed voltages with different voltages are applied to the motor to be tested.
[0007] Further, the industrial control computer collects, processes the data of the magnetic angle encoder, and controls the motor drive circuit, so that the pulsed voltage applied to the motor to be tested and the angle collected by the magnetic angle encoder are synchronized in time. Then, the test data is analyzed to give the test result.
[0008] Further, DO1 and DO2 of the data acquisition card are connected to the input terminals of the H-bridge drive circuit to output high and low levels, controlling the power supply to the motor under test. When DO1 is high and DO2 is low, a forward rotation voltage is applied to the motor under test. When DO1 is low and DO2 is high, a reverse rotation voltage is applied to the motor under test; the 5V working voltage of the H-bridge drive circuit is connected to the magnetic angle encoder, and the magnetic angle encoder is set to the analog voltage output mode, and a voltage signal proportional to the angle is output in real time.
[0009] Further, the data acquisition card acquires the voltage signal of the magnetic angle encoder in a differential manner and transmits the acquired data to the industrial control computer. In order to synchronize the acquisition of angle data and the power supply to the motor in time, while DO1 and DO2 on the data acquisition card output high and low levels, the data acquisition process is triggered through PF1 and PF2. After the trigger, the data acquisition card starts to acquire the output of the magnetic angle encoder.
[0010] Further, a power supply is set to provide 12V power supply for the H-bridge drive circuit, and the output torque characteristics of the motor under voltage deviation can be investigated by changing the voltage of the power supply.
[0011] In addition, the present invention provides a test method based on the aforementioned test device for quickly testing the output torque of a limited-rotation-angle motor, which is characterized by including the following steps:
[0012] S1, the motor under test is installed on the test device structure, connected in a matching manner with the rotating shaft, and the leads required for standby of the motor under test are connected;
[0013] S2, the motor under test and the inertial load rotate to the zero position;
[0014] S3, according to the required test rotation direction, the industrial control computer sends corresponding timing pulses to the motor drive circuit through the data acquisition card, and the motor drive circuit starts to drive the motor under test to rotate. While the data acquisition card sends timing pulses, the acquisition of the angle data of the magnetic angle encoder is triggered;
[0015] S4, after a specified time, the industrial control computer processes the acquired angle data to obtain time-angle data;
[0016] S5, according to the time-angle data measured in step S4, based on the relationship between the output torque of the motor under test, the moment of inertia of the load and the angular acceleration, and the relationship between the rotation angle and the angular acceleration and time during the process of the motor under test rotating from the stationary state to a certain angle, under a certain inertial load, the relationship data between the rotation angle and time of the motor is analyzed, and the data is fitted by the second-order polynomial fitting method to obtain the angular acceleration of the motor under test, and the output torque of the motor under test is calculated in combination with the inertial load. This output torque includes the torque at startup and can better reflect the output torque of the motor in actual operation.
[0017] Advantages of the present invention:
[0018] (1) In the test device of the present invention, there is no torque sensor sensitive to the environment, and it can be used to test the output torque of the motor under environmental conditions such as high and low temperatures and vibrations. (2) The voltage pulse applied to the motor to be tested in the present invention is controlled by software, and different voltages and voltage pulses of different durations can be flexibly applied to the motor, and the output torque performance of the motor can be comprehensively tested. (3) The inertial load of the test device of the present invention is flexibly assembled on the rotating shaft and can be conveniently replaced according to different motors and different test requirements. (4) The present invention collects the whole process data of the motor rotation process through a data acquisition card, and can store and display the action time curve of the motor rotation process for analyzing various performances of the motor. (5) The test device of the present application can be tested in high-temperature, low-temperature environments and vibration environments, while other test devices in the prior art can only work under normal conditions. Description of the drawings
[0019] Figure 1 It is a schematic structural diagram of the test device of the present invention;
[0020] Figure 2 It is a schematic electrical connection diagram of the test device of the present invention;
[0021] In the figure, 1 - motor to be tested, 2 - inertial load, 3 - permanent magnet, 4 - magnetic angle encoder. Specific implementation manners
[0022] The technical solutions of this specification will be described below with reference to the drawings.
[0023] Example 1
[0024] The present invention provides a rapid test device for the output torque of a limited-angle motor, which is characterized in that the test device comprises a test device structure, a motor drive circuit and an industrial control computer equipped with a data acquisition card;
[0025] The test device structure includes a rotating shaft, an inertial load 2, a permanent magnet 3 and a magnetic angle encoder 4. A notch matching the output shaft of the motor to be tested 1 is provided at one end of the rotating shaft to transmit the torque output by the motor to the rotating shaft. A permanent magnet 3 is fixed at the other end of the rotating shaft. An inertial load 2 is arranged in the middle section of the rotating shaft. Bearings are installed on the rotating shaft to reduce the frictional resistance. The magnetic angle encoder 4 is arranged at a position opposite to the permanent magnet, and the permanent magnet is used for the magnetic angle encoder to detect the angle of the rotating shaft. The test device structure is as Figure 1 shown.
[0026] Furthermore, the motor drive circuit is an H-bridge drive circuit, which is used to input pulse voltage to the motor to drive the motor to rotate. By inputting different timing pulses to the motor drive circuit, the forward and reverse rotation of the motor is controlled, and by giving different input voltages to the motor drive circuit, pulses of different voltages are applied to the motor to be tested.
[0027] Furthermore, the industrial computer collects, processes and controls the motor drive circuit for the data of the magnetic angle encoder 4, so that the pulse voltage applied to the motor 1 to be tested and the angle collected by the magnetic angle encoder 4 are synchronized in time, and then analyzes the test data to give the test results.
[0028] Furthermore, DO1 and DO2 of the data acquisition card are connected to the input of the H-bridge drive circuit to output high and low levels, and control the power supply to the motor to be tested. When DO1 is high and DO2 is low, a forward voltage is applied to the motor to be tested, and when DO1 is low and DO2 is high, a reverse voltage is applied to the motor to be tested. The 5V working voltage of the H-bridge drive circuit is connected to the magnetic angle encoder 4, and the magnetic angle encoder is set to analog voltage output mode to output a voltage signal proportional to the angle in real time. The electrical connection of the test device is as follows: Figure 2 shown.
[0029] Furthermore, the data acquisition card collects the voltage signal of the magnetic angle encoder 4 in a differential manner and transmits the collected data to the industrial computer. In order to synchronize the collection of angle data and the power-on of the motor in time, while DO1 and DO2 on the data acquisition card output high and low levels, the data acquisition process is triggered through PF1 and PF2. After the trigger, the data acquisition card starts to collect the output of the magnetic angle encoder 4.
[0030] Furthermore, the power supply is set to provide 12V power supply for the H-bridge drive circuit, and the output torque characteristics of the motor under the condition of voltage deviation can be examined by changing the voltage of the power supply.
[0031] In addition, the present invention provides a testing method based on the aforementioned limited-angle motor output torque rapid testing device, characterized in that it comprises the following steps:
[0032] S1, the motor 1 to be tested is installed on the test device structure, matched and connected with the rotating shaft, and the leads required by the motor 1 to be tested are connected;
[0033] S2, the motor 1 to be tested and the inertial load 2 rotate to zero position;
[0034] S3, testing the rotation direction as needed, the industrial computer sends the corresponding timing pulses to the motor drive circuit through the data acquisition card, the motor drive circuit starts to drive the motor 1 to be tested to rotate, and the data acquisition card triggers the acquisition of angle data of the magnetic angle encoder 4 while sending the timing pulses;
[0035] S4. After a specified time, the industrial control computer processes the collected angle data to obtain time-angle data;
[0036] S5. According to the time-angle data measured in step S4, based on the relationship between the output torque, load moment of inertia, and angular acceleration of the motor under test 1, as well as the relationship between the rotation angle, angular acceleration, and time during the process of the motor under test 1 rotating from a stationary state to a certain angle, under a certain inertial load condition, analyze the relationship data between the motor rotation angle and time, fit the data using the second-order polynomial fitting method to obtain the angular acceleration of the motor under test 1, and calculate the output torque of the motor under test in combination with the inertial load. This output torque includes the torque at startup and can better reflect the output torque of the motor during actual operation.
[0037] The present invention has been described in detail above in combination with specific embodiments and exemplary examples. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments; the above description should not be construed as a limitation of the present invention. Those skilled in the art understand that without departing from the spirit and scope of the present invention, various equivalent substitutions, modifications, or improvements can be made to the technical solutions and their implementation manners of the present invention, and these all fall within the scope of the present invention; the protection scope of the present invention is subject to the appended claims.
Claims
1. A fast test device for output torque of a limited-angle motor, characterized in that: The test device includes a test device structure, a motor drive circuit and an industrial computer equipped with a data acquisition card; The test device structure comprises a rotating shaft, an inertial load (2), a magnetic steel (3) and a magnetic angle encoder (4); a notch matching the output shaft of the motor to be tested (1) is arranged at one end of the rotating shaft, the magnetic steel (3) is fixed at the other end of the rotating shaft, the inertial load (2) is arranged at the middle section of the rotating shaft, a bearing is installed on the rotating shaft, and the magnetic angle encoder (4) is arranged at a position directly opposite to the magnetic steel.
2. A device for quickly testing the output torque of a limited-angle motor according to claim 1, characterized in that: The motor driving circuit is an H-bridge driving circuit, which drives the motor to be tested to rotate.
3. A fast test device for output torque of a limited-angle motor according to claim 1, characterized in that: The industrial computer collects and processes the data of the magnetic angle encoder (4) and controls the motor drive circuit, so that the pulse voltage applied to the motor (1) to be tested and the angle collected by the magnetic angle encoder (4) are synchronized in time.
4. A device for quickly testing the output torque of a limited-angle motor according to claim 3, characterized in that: DO1 and DO2 of the data acquisition card are connected to the input end of the H-bridge driving circuit to output high and low levels; the 5V working voltage of the H-bridge driving circuit is connected to the magnetic angle encoder (4).
5. A device for quickly testing the output torque of a limited-angle motor according to claim 4, characterized in that: The data acquisition card acquires the voltage signal of the magnetic angle encoder (4) in a differential manner and transmits the acquired data to the industrial computer. When DO1 and DO2 on the data acquisition card output high and low levels, the data acquisition process is triggered through PF1 and PF2. After the triggering, the data acquisition card starts to acquire the output of the magnetic angle encoder (4).
6. A device for quickly testing the output torque of a limited-angle motor according to claim 2, characterized in that: The power supply is set to provide 12V power supply to the H-bridge drive circuit, and the bias voltage test is provided to the motor (1) to be tested by changing the power supply voltage.
7. A testing method using a fast testing device for output torque of a limited-angle motor according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, the motor to be tested (1) is mounted on the test device structure, matched and connected with the rotating shaft, and the leads required by the motor to be tested (1) are connected; S2, the motor (1) to be tested and the inertial load (2) rotate to zero position; S3, testing the rotation direction as required, the industrial computer sends corresponding timing pulses to the motor drive circuit through the data acquisition card, the motor drive circuit starts to drive the motor (1) to be tested to rotate, and the data acquisition card triggers the acquisition of angle data of the magnetic angle encoder (4) while sending the timing pulses; S4, after a specified time has passed, the industrial computer processes the collected angle data to obtain time angle data; S5, according to the time angle data measured in step S4, according to the relationship between the output torque of the motor (1) to be tested, the load moment of inertia and the angular acceleration, and the relationship between the rotation angle, the angular acceleration and the time during the process of the motor (1) to be tested rotating from a stationary state to a certain angle, under a certain inertial load, the relationship data between the motor rotation angle and time is analyzed, the data is fitted using a second-order polynomial fitting method, the angular acceleration of the motor (1) to be tested is obtained, and the output torque of the motor to be tested is calculated in combination with the inertial load.