A performance test test bench based on a low-power direct current motor

Abstract

The utility model relates to a kind of performance test test bench based on low-power DC motor, it is characterized in that, including: test bench (15), movable workbench base (1) and the movable workbench (2) being set on it, motor mounting support (3) for installing measured DC motor (4), torque speed sensor (6), hysteresis dynamometer (8), rolling guide (9), workbench front and rear moving mechanism and workbench up and down moving mechanism.The utility model not only can realize the test of various motor high, low speed and other work, but also can carry out speed characteristic curve detection, torque characteristic curve detection, vibration characteristic curve detection, current characteristic curve detection, efficiency characteristic curve detection, each specific point detection test and durability test to low-power DC motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor performance testing, specifically relating to a performance testing bench based on a low-power DC motor. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque, serving as a power source for electrical appliances or various machines. Before being put into use, an electric motor must undergo testing to ensure its performance. All mass-produced DC motors and those returned for repair require routine or type tests to verify their performance under different operating conditions. These tests provide relevant performance data of the tested motor, which can be used to determine whether the motor meets design requirements, its quality, and the goals and directions for improvement. Motor manufacturers invest heavily in building motor testing systems.

[0003] An existing AC motor integrated test bench uses torque control via an AC variable frequency feedback load controller to test the drive motor under various load conditions. However, it is costly, has limited applicability, and requires two sets of variable frequency motors and inverters, making it unsuitable for performance testing of small DC motors. This test bench is limited to testing the drive motor's speed and load capacity, and cannot test the vibration data of the drive motor during rotation. It also does not perform real-time detection and analysis of the DC motor's characteristic curves, such as torque, vibration, current, and efficiency.

[0004] Another type of DC motor testing system uses a central processing module to control each module. The tested motor M1 achieves torque control through a companion motor M2. However, this system has limitations in its application and is not suitable for performance testing of small DC motors. It does not perform real-time detection and analysis of characteristic curves such as torque, vibration, current, and efficiency of the DC motor.

[0005] This demonstrates the shortcomings of existing small motor testing platforms, including mechanical structural issues such as misalignment of the coupling introducing additional vibrations and affecting the accuracy of torque measurement; insufficient platform rigidity leading to high-frequency vibrations or resonances, affecting the test structure; and reliance on manual operation (such as switching loads and recording data), resulting in low efficiency and high human error. Utility Model Content

[0006] This utility model provides a performance testing bench based on a low-power DC motor. The technical problem to be solved is to overcome the shortcomings of the existing technology for testing low-power DC motors, improve the testing efficiency of low-power DC motors, and quickly obtain various performance indicators of the motor.

[0007] To address the above technical problems, this utility model provides a performance testing bench based on a low-power DC motor, characterized by comprising: Test bench 15; The movable workbench base 1 and the movable workbench 2 mounted thereon; The motor mounting bracket 3 is fixed on the movable workbench 2 and is used to mount the DC motor 4 under test; The torque and speed sensor 6 is connected to the DC motor 4 under test via a first flexible coupling 5 at one end. The hysteresis dynamometer 8 is connected to the other end of the torque-speed sensor 6 via a second flexible coupling 7. A rolling guide rail 9 is fixed on the test bench 15, and a slider 10 is provided on it to support and adjust the position of the torque speed sensor 6 and the hysteresis dynamometer 8. A front-to-back moving mechanism for the worktable is installed between the movable worktable base 1 and the movable worktable 2, and is used to drive the movable worktable 2 to move in the front-to-back direction; The worktable moving mechanism is used to drive the movable worktable 2 to move in the vertical direction.

[0008] Furthermore, a vibration sensor is installed on the motor mounting bracket 3; a chip resistor is installed on the housing of the DC motor 4 under test.

[0009] Furthermore, it also includes a control system, including a host computer, a dynamometer controller, a digital electrical parameter measuring instrument, and a motor performance analyzer, used to collect and analyze the motor's torque, speed, vibration, current, and efficiency parameters in real time, and to plot characteristic curves.

[0010] Furthermore, the control system also includes an automatic load loading module, which is used to automatically control the hysteresis dynamometer 8 to load according to the set torque, and scan the characteristic curve of the motor from no load to load.

[0011] Furthermore, the control system can display or print one or more characteristic curves of torque, speed, vibration, current, and efficiency in real time, and supports modification of curve coordinate parameters and data playback.

[0012] Furthermore, the control system also includes a fault diagnosis module, which is used to determine the rotor imbalance, bearing failure or eccentricity fault of the motor based on vibration spectrum analysis.

[0013] Furthermore, the feature is that the worktable forward and backward moving mechanism includes a lead screw and a forward and backward moving handwheel 11. The movable worktable base is equipped with the lead screw, the forward and backward moving handwheel is directly connected to the lead screw, and the movable worktable is equipped with a lead nut that cooperates with the lead screw to move in the forward and backward direction.

[0014] Furthermore, the workbench moving mechanism includes a lifting screw 14, a worm gear mechanism, and a moving handwheel 12. A worm gear mechanism is installed on the lifting screw. The lifting screw is mounted on the test bench through a screw nut. The screw nut is directly connected to the worm gear. The worm is connected to the moving handwheel. Rotating the moving handwheel drives the moving workpiece to move up and down.

[0015] Furthermore, the vibration sensor is a patch-type vibration sensor.

[0016] Beneficial effects: 1. The motor under test is easy to install and adjust, and can perform real-time detection and analysis of characteristic curves such as torque, vibration, current, and efficiency of the DC motor under test; 2. By conducting no-load and load capacity tests and collecting vibration spectrum data of the motor, not only can routine testing of the motor be achieved, but also various hidden faults of the tested motor can be quickly identified, such as dynamic imbalance caused by rotor friction and eccentricity, as well as bearing failures. Attached Figure Description

[0017] Figure 1 Structure diagram of the performance testing bench for low-power DC motors. Detailed Implementation

[0018] To make the purpose, content and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below.

[0019] This utility model proposes a performance testing bench based on a low-power DC motor, including a movable workbench base 1, a movable workbench 2, a motor mounting support 3, a motor under test 4, a #1 flexible coupling 5, a torque and speed sensor 6, a #2 flexible coupling 7, a hysteresis dynamometer 8, a rolling guide rail 9, a slider 10, a workbench front and rear movement handwheel 11, a workbench up and down movement handwheel 12, a support light bar 13, a lifting screw 14, and a test bench frame 15; The tested motor 4 is a DC motor.

[0020] Other auxiliary and control devices include a host computer, a digital electrical parameter measuring instrument, a motor performance analyzer, a vibration sensor, a temperature sensor, a DC power supply, and a dynamometer controller. The test motor 4 has a chip resistor mounted on its housing, and the motor mounting bracket 3 has a chip vibration sensor mounted on it to detect the temperature and vibration data generated by the motor during operation. The motor mounting bracket 3 is fixed on the movable workbench 2. The motor 4 under test is mounted on the motor mounting bracket 3 and connected to one end of the torque and speed sensor 6 through the No. 1 flexible coupling 5. The other end of the torque and speed sensor 6 is connected to the hysteresis dynamometer 8 through the No. 2 flexible coupling 7.

[0021] The rolling guide rail 9 is fixed on the test bench 15. The slider 10 can move left and right on the rolling guide rail 9. The torque speed sensor 6 and the hysteresis dynamometer 8 are fixed on the corresponding sliders by brackets. Each bracket has a locking screw.

[0022] The movable workbench base 1 is equipped with a lead screw, and the workbench forward and backward movement handwheel 11 is directly connected to the lead screw. The movable workbench 2 is equipped with a lead screw nut. Rotating the workbench forward and backward movement handwheel 11 allows the movable workbench 2 to move forward and backward on the movable workbench base 1. A worm gear mechanism is installed on the lifting lead screw 14. The lifting lead screw 14 is installed on the test bench frame 15 through the lead screw nut. The lead screw nut is directly connected to the worm gear, and the worm is connected to the workbench up and down movement handwheel 12. Rotating the workbench up and down movement handwheel 12 allows the movable workbench 2 to move up and down under the guidance of the support rod 13.

[0023] Specific work process: 1. No-load test of the motor: The motor 4 to be tested is mounted on the motor mounting bracket 3, which is fixed on the movable workbench 2. One end of the #1 flexible coupling is installed on the workbench 2, and the other end of the #1 flexible coupling is connected to the torque and speed sensor 6. The torque and speed sensor 6 is pushed to the left, while the workbench up and down movement handwheel 12 and the workbench back and forth movement handwheel 11 are rotated. The connection between the motor 4 to be tested and the torque and speed sensor 6 is adjusted through the #1 flexible coupling 5 to adjust the coaxiality and fix the torque and speed sensor. The #2 flexible coupling 7 is not connected to the hysteresis dynamometer 8.

[0024] After the motor is installed and adjusted, start the motor on the control screen and adjust the output voltage of the DC power supply to make the motor under test rotate to its rated speed. The control screen displays the no-load operating point of the motor under test in real time (no-load speed, no-load current, no-load torque, input power, output power, vibration spectrum, etc.). 2. Motor loading test: The operation method for the motor loading test is basically similar to that for the no-load test; it only needs to be followed... Figure 1 Connect the #2 flexible coupling 7 to the hysteresis dynamometer 8, and input the required torque in the load input area on the operation screen. The control screen displays the rated operating point of the tested motor in real time (input voltage, current, power, power factor, frequency, output torque, speed, vibration spectrum, output power and efficiency, etc.).

[0025] The load of this utility model can be automatically loaded according to the settings, scan the characteristic curve of the motor from no load to load, and automatically calculate the efficiency plateau and characteristic points. Motor test data can be displayed or printed in the form of reports or curves. It can be saved and viewed again the next time. When viewing the displayed curve, the curve coordinate parameters and the selection of the horizontal and vertical axes can be modified. By conducting no-load and load capacity tests and collecting vibration spectrum data of the motor, not only can routine motor testing be achieved, but also various latent faults of the tested motor can be quickly identified.

[0026] This invention can simulate corresponding loads and perform speed characteristic curve testing, torque characteristic curve testing, vibration characteristic curve testing, current characteristic curve testing, efficiency characteristic curve testing, and specific point testing (no-load, load, overload, etc.) and durability testing on low-power DC motors. Specific items include: (1) No-load operating point (dynamometer without load): speed, input current, input voltage, input power; (2) Rated operating point: input voltage, current, power, power factor, frequency, output torque, speed, vibration spectrum, output power and efficiency; (3) Stalled operating point: input voltage, current, power, vibration spectrum, output torque; (4) Torque and speed characteristics.

[0027] This invention can not only perform high and low speed tests on various motors, but also conduct speed characteristic curve tests, torque characteristic curve tests, vibration characteristic curve tests, current characteristic curve tests, efficiency characteristic curve tests, specific point tests (no-load, load, overload) tests, and durability tests on small power DC motors.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A performance testing bench based on a low-power DC motor, characterized in that, include: Test bench (15); The movable workbench base (1) and the movable workbench (2) mounted thereon; The motor mounting bracket (3) is fixed on the movable workbench (2) and is used to install the DC motor (4) under test. The torque and speed sensor (6) is connected at one end to the DC motor (4) under test via a first flexible coupling (5); The hysteresis dynamometer (8) is connected to the other end of the torque speed sensor (6) via a second flexible coupling (7); A rolling guide rail (9) is fixed on the test bench (15), and a slider (10) is provided on it to support and adjust the position of the torque speed sensor (6) and the hysteresis dynamometer (8); The worktable forward and backward moving mechanism is installed between the movable worktable base (1) and the movable worktable (2) to drive the movable worktable (2) to move in the forward and backward direction; The workbench moving mechanism is used to drive the movable workbench (2) to move in the up and down direction.

2. The performance testing bench according to claim 1, characterized in that, A vibration sensor is installed on the motor mounting bracket (3); a chip resistor is installed on the housing of the DC motor (4) under test.

3. The performance testing bench according to claim 1, characterized in that, It also includes a control system, including a host computer, a dynamometer controller, a digital electrical parameter measuring instrument, and a motor performance analyzer, which are used to collect and analyze the motor's torque, speed, vibration, current, and efficiency parameters in real time, and to plot characteristic curves.

4. The performance testing bench according to claim 3, characterized in that, The control system also includes an automatic load loading module, which is used to automatically control the hysteresis dynamometer (8) to load according to the set torque, and scan the characteristic curve of the motor from no load to load.

5. The performance testing bench according to claim 4, characterized in that, The control system can display or print one or more characteristic curves of torque, speed, vibration, current, and efficiency in real time, and supports modification of curve coordinate parameters and data playback.

6. The performance testing bench according to claim 3, characterized in that, The control system also includes a fault diagnosis module, which is used to determine the rotor imbalance, bearing failure or eccentricity fault of the motor based on vibration spectrum analysis.

7. The performance testing bench according to any one of claims 1-6, characterized in that, The worktable forward and backward movement mechanism includes a lead screw and a forward and backward movement handwheel (11). The base of the movable worktable is equipped with a lead screw, the forward and backward movement handwheel is directly connected to the lead screw, and the movable worktable is equipped with a lead screw nut, which cooperates with the lead screw to move in the forward and backward direction.

8. The performance testing bench according to any one of claims 1-6, characterized in that, The workbench moving mechanism includes a lifting screw (14), a worm gear mechanism and a moving handwheel (12). A worm gear mechanism is installed on the lifting screw. The lifting screw is installed on the test bench through a screw nut. The screw nut is directly connected to the worm gear. The worm is connected to the moving handwheel. Rotating the moving handwheel drives the moving workpiece to move up and down.

9. The performance testing bench according to claim 2, characterized in that, The vibration sensor is a patch-type vibration sensor.

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