Generator tester

Abstract

The utility model provides a generator tester, which comprises a testboard, a fixing device arranged on the testboard and used for fixing a to-be-tested generator, a flywheel rotatably connected on the testboard, a flywheel shaft fixed in the middle of the flywheel, and a connecting device connected with one end of the flywheel shaft and used for being fixedly connected with a rotating shaft of the to-be-tested generator. The test bench is also provided with a brake device used for braking the flywheel. According to the utility model, a traditional motor and generator detection bench is abandoned, a generator and flywheel structure detection bench is adopted, the generator is electrified to work in an electric state, the flywheel is driven to rotate, the flywheel stores energy, and after a certain rotating speed is reached, the driving voltage of the motor is cut off, and the flywheel drives the generator to rotate to generate power; the generator works in a power generation state, subsequent detection is carried out on the generator through the other voltage, current and noise detection devices, a flywheel is adopted to replace a motor, and noise generated by the motor is prevented from affecting the noise detection result of the generator.

Description

Technical Field

[0001] The utility model relates to the field of generator testing equipment, and particularly to a generator tester. Background Art

[0002] After a generator is manufactured, it is necessary to check whether the generator is qualified. The detection items include: whether the voltage, current, and rotational speed match, and whether the noise meets the standard.

[0003] The conventional test bench uses a motor to drive the generator to rotate and generate electricity for testing. For the voltage, current, and rotational speed, there are no problems. However, when testing the noise, a problem will occur, that is, the motor will also generate noise during operation, and the noise of the motor will be mixed with the noise of the generator, affecting the noise test result. Summary of the Utility Model

[0004] The utility model provides a generator tester, which solves the problem that when the existing test bench uses a motor to drive the generator to rotate to detect the generator parameters, the noise generated by the motor will be mixed with the noise of the generator, affecting the noise test result of the generator.

[0005] The technical solution of the utility model is realized as follows:

[0006] The generator tester includes a test bench, on which a fixing device for fixing the generator to be tested is provided. A flywheel is rotatably connected to the test bench. A flywheel shaft is fixed in the middle of the flywheel. One end of the flywheel shaft is connected with a connecting device for fixedly connecting with the rotating shaft of the generator to be tested. A braking device for braking the flywheel is also provided on the test bench.

[0007] As a further technical solution, the test bench includes a bottom plate, on which two vertical and symmetric flywheel support plates are fixed. The flywheel shaft is horizontally connected to the two flywheel support plates through bearings.

[0008] As a further technical solution, the fixing device includes a generator mounting plate, on which a generator mounting hole is provided. A generator locking bolt leading to the generator mounting hole is threadedly connected to the generator mounting plate.

[0009] As a further technical solution, the connecting device includes a coupling and a docking shaft. The coupling is respectively connected with the flywheel shaft and the docking shaft. A docking hole for docking and fixing with the rotating shaft of the generator to be tested is provided at the center of the outer end face of the docking shaft.

[0010] As a further technical solution, the docking hole is a D-shaped hole having the same shape as the rotating shaft of the generator to be tested; or, the docking hole is a circular hole having the same shape as the rotating shaft of the generator to be tested, and a rotating shaft locking bolt leading to the circular hole is threadedly connected to the docking shaft.

[0011] As a further technical solution, the braking device includes a brake pad and a driving device for driving the brake pad to approach and move away from the flywheel.

[0012] As a further technical solution, the driving device includes an arc-shaped brake pad mounting plate. The middle part of the brake pad mounting plate is rotatably connected between two support plates. The brake pad is fixed to one end of the brake pad mounting plate. A pushing device and a return spring are connected to the other end of the brake pad mounting plate. The other end of the return spring is connected to a spring baffle. The pushing device is a manual push rod or a wire-pulling motor.

[0013] As a further technical solution, a detection device is further included. The detection device is fixed on the test bench. The detection device includes a switching power supply, a first-stage voltage stabilization circuit, a second-stage voltage stabilization circuit, and a controller that are electrically connected in sequence. The first-stage voltage stabilization circuit is electrically connected to an electronic load meter. The switching power supply is also sequentially connected to a relay, a brushless motor driver, and a three-phase socket. The three-phase socket is also sequentially connected to a rectifier bridge circuit and an electronic load meter. The electronic load meter is connected to the controller. The relay is connected to the controller through a relay controller. One wiring point of the three-phase socket is connected to the controller through a motor back electromotive force speed measurement circuit. The controller is also electrically connected to a screen and a plurality of control buttons.

[0014] As a further technical solution, a decibel meter for detecting the noise of the generator under test is further included.

[0015] As a further technical solution, the three-phase socket is a 3PIN socket, and the controller is an MCU.

[0016] The beneficial effects of the present utility model: The present utility model abandons the traditional detection bench of motor + generator and adopts a detection bench with a structure of generator + flywheel. First, the generator is powered on and operates in the electric state to drive the flywheel to rotate, so that the flywheel stores energy. After reaching a certain rotational speed, the driving voltage of the motor is cut off, and the flywheel drives the generator to rotate and generate electricity, making the generator operate in the power generation state. Then, subsequent detection of the generator is carried out through additional voltage, current, and noise detection devices. The flywheel is used instead of the motor to prevent the noise generated by the motor from affecting the generator noise detection result. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a perspective view of Embodiment 1;

[0019] Figure 2 Isometric view of another angle of Example 1;

[0020] Figure 3 Right view of Example 1;

[0021] Figure 4 Isometric view of the braking device in Example 1;

[0022] Figure 5 Isometric view of the connecting device in Example 1;

[0023] Figure 6 Connection block diagram of the detection device in Example 1;

[0024] Figure 7 Circuit diagram of the controller in Example 1;

[0025] Figure 8 Circuit diagram of the switching power supply in Example 1;

[0026] Figure 9 Circuit diagram of the motor back electromotive force speed measurement circuit in Example 1;

[0027] Figure 10 Circuit diagram of the primary voltage stabilizing circuit in Example 1;

[0028] Figure 11 Circuit diagram of the secondary voltage stabilizing circuit in Example 1;

[0029] Figure 12 Connection diagram of the generator under test A, rectifier bridge circuit and electronic load meter circuit in Example 1;

[0030] Figure 13 Connection diagram of the rotating shaft of the generator under test and the docking shaft in Example 2;

[0031] Figure 14 Right view of Example 2.

[0032] In the figure: A - generator under test, 1 - test bench, 11 - base plate, 12 - flywheel support plate, 2 - fixing device, 21 - generator mounting plate, 22 - generator locking bolt, 3 - flywheel, 31 - flywheel shaft, 4 - connecting device, 41 - coupling, 42 - docking shaft, 421 - docking hole, 422 - rotating shaft locking bolt, 5 - braking device, 51 - brake pad, 52 - brake pad mounting plate, 53 - support plate, 54 - return spring, 55 - spring baffle, 56 - manual push rod, 57 - wire-pulling motor, 6 - detection device, 61 - screen. Detailed implementation method

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] Embodiment 1

[0035] Refer to Figures 1-6 , a generator tester, including a test bench 1, a fixing device 2 for fixing the generator A to be tested is arranged on the test bench 1, a flywheel 3 is rotatably connected to the test bench 1, a flywheel shaft 31 is fixed in the middle of the flywheel 3, one end of the flywheel shaft 31 is connected with a connecting device 4 for fixedly connecting with the rotating shaft of the generator A to be tested, and a braking device 5 for braking the flywheel 2 is also arranged on the test bench 1.

[0036] The test bench 1 includes a bottom plate 11, two vertical and symmetrical flywheel support plates 12 are fixed on the bottom plate 11, and the flywheel shaft 31 is horizontally connected to the two flywheel support plates 12 through bearings.

[0037] The fixing device 2 includes a generator mounting plate 21, a generator mounting hole is opened on the generator mounting plate 21, and a generator locking bolt 22 leading to the generator mounting hole is threadedly connected to the generator mounting plate 21.

[0038] The connecting device 4 includes a coupling 41 and a docking shaft 42. The coupling 41 is respectively connected with the flywheel shaft 31 and the docking shaft 42, and a docking hole 421 for docking and fixing with the rotating shaft of the generator A to be tested is opened at the center of the outer end face of the docking shaft 42. The docking hole 421 is a D-shaped hole having the same shape as the rotating shaft of the generator.

[0039] The braking device 5 includes a brake pad 51 and a driving device for driving the brake pad to approach and move away from the flywheel. The driving device includes an arc-shaped brake pad mounting plate 52. The middle of the brake pad mounting plate 52 is rotatably connected between two support plates 53. The brake pad 51 is fixed to one end of the brake pad mounting plate 52. The other end of the brake pad mounting plate 52 is connected with a pushing device and a return spring 54. The other end of the return spring 54 is connected with a spring baffle 55. The pushing device is a manual push rod 56. The hole of the test bench 1 through which the manual push rod 56 passes is larger than the diameter of the manual push rod 56, because the manual push rod 56 tilts to a certain extent during the pulling process, and if the hole is too small, the manual push rod 56 will be stuck.

[0040] Refer to Figures 6-12, As a further technical solution, it further includes a detection device 6. The detection device 6 is fixed on the test bench 1. The detection device includes a switching power supply, a primary voltage stabilizing circuit, a secondary voltage stabilizing circuit, and a controller that are electrically connected in sequence. The primary voltage stabilizing circuit is electrically connected to an electronic load meter. The switching power supply is also sequentially connected to a relay, a brushless motor driver, and a three-phase socket. The three-phase socket is also sequentially connected to a rectifier bridge circuit and an electronic load meter. The electronic load meter is electrically connected to the controller. The relay is electrically connected to the controller through a relay controller. One connection point of the three-phase socket is electrically connected to the controller through a motor back electromotive force speed measurement circuit. The controller is also electrically connected to a screen 61 and several control buttons. The control buttons include a start button and a stop button. The three-phase socket is a 3PIN socket, and the controller can be an MCU.

[0041] Among them, the switching power supply is used to convert 220V commercial power into a 36V power source. The primary voltage stabilizing circuit is used to convert the 36V power input by the switching power supply into a 12V power source. The secondary voltage stabilizing circuit is used to convert the 12V power input by the primary voltage stabilizing circuit into a 3.3V power source. The relay controller and the brushless motor driver are existing products, so no detailed introduction is made.

[0042] As a further technical solution, it further includes a decibel meter (not shown) for detecting the noise of the generator under test.

[0043] The working principle of the present utility model:

[0044] First, place the generator under test A into the generator installation hole, insert the rotating shaft of the generator under test A into the docking hole 421, and then fix the generator under test A through the generator locking bolt 22. Insert the three-phase plug of the generator under test A into the three-phase socket, and press the start button. The MCU controls the relay 64 to close through the relay controller, and the brushless motor driver is powered on to drive the generator under test A to rotate. The generator under test A drives the flywheel 3 to rotate and gradually accelerate. As the rotational speed increases, the mechanical energy stored in the flywheel 3 also increases. When the rotational speed reaches the set value, the MCU controls the relay to disconnect through the relay controller. The MCU sends an instruction to the electronic load meter to make it work in a constant resistance load state (equivalent to a resistor). The generator under test A is now working in a power generation state, and the electricity generated is rectified and filtered by the rectifier bridge circuit and supplied to the electronic load meter to consume electrical energy. The MCU records the voltage V1 and current value I1 at this time, which is one of the bases for judging the quality of the generator under test A. At the same time, timing starts. As the mechanical energy of the flywheel 3 is consumed, the rotational speeds of the flywheel 3 and the generator under test A both decrease. During the entire process of the rotational speed decrease, the MCU will record all the voltage and current values during this period. When it detects that the rotational speed drops to the set value, the data recording is completed. The MCU judges the time T required for the rotational speed to drop from the highest value to this value, and detects the voltage V2 and current I2 at this time. If V1, I1, V2, I2, and T meet the standard values, it is determined that the generator under test A is qualified; otherwise, it is determined to be unqualified. During the entire process of the rotational speed decrease, a decibel meter is also needed to detect the noise, and an operator observes the data of the decibel meter to see if it meets the standard. At this time, except for the generator under test A, the noise of other components is extremely small and does not affect the test results. After the test, when it is necessary to stop the flywheel 3 with residual speed, the manual push rod can be pulled, the brake pad mounting plate 52 rotates, and the brake pad 51 contacts the circumferential side surface of the flywheel 3 to achieve the braking purpose. When the manual push rod 56 is released, the brake pad 51 resets under the action of the return spring 54. After testing one, loosen the generator locking bolt 22 and replace it with the next generator under test A for testing. During the entire process of the rotational speed decrease, the MCU records the values of voltage, current, and rotational speed during the entire process, and plots these three groups of curves on the screen 61 (the horizontal axis is time, and the vertical axes are voltage and current respectively) for the user to observe whether the curves are normal.

[0045] The utility model abandons the traditional detection bench of motor + generator, and adopts a detection bench with a structure of generator + flywheel. First, the generator is powered on to work in the electric state, drives the flywheel to rotate, stores energy in the flywheel. After reaching a certain rotational speed, the driving voltage of the motor is cut off, and the flywheel drives the generator to rotate and generate electricity, making the generator work in the power generation state. Then, subsequent detection of the generator is carried out through other voltage, current, and noise detection devices. The flywheel is used instead of the motor to prevent the noise generated by the motor from affecting the generator noise detection results.

[0046] Embodiment 2

[0047] Referring to Figure 13 and Figure 14 , the difference between this embodiment and Embodiment 1 is as follows: the docking hole 421 is a circular hole with the same shape as the rotating shaft of the generator A to be measured. The docking shaft is threadedly connected with a rotating shaft locking bolt 422 leading to the circular hole. During docking, the rotating shaft of the generator A to be measured is inserted into the docking hole 421, and then the rotating shaft of the generator A to be measured is locked by the rotating shaft locking bolt 422. The pushing device is a wire-pulling motor 57, which is electrically connected to the MCU. The control buttons include a brake button. When braking is required, the brake button is pressed, and the MCU controls the wire-pulling motor to pull the wire, driving the brake pad mounting plate 52 to rotate, so that the brake pads 51 contact the circumferential side surface of the flywheel 3 to achieve the purpose of braking. Then, when the brake button is pressed again, the wire-pulling motor 57 releases the wire, and under the action of the return spring 54, the brake pad mounting plate 52 returns to its original position.

[0048] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Generator tester, characterized in that: It includes a test bench, on which a fixing device for fixing the generator under test is provided. A flywheel is rotatably connected to the test bench. A flywheel shaft is fixed in the middle of the flywheel. One end of the flywheel shaft is connected with a connecting device for fixedly connecting with the rotating shaft of the generator under test. A braking device for braking the flywheel is also provided on the test bench.

2. The generator tester according to claim 1, characterized in that: The test bench includes a bottom plate, on which two vertical and symmetrical flywheel support plates are fixed. The flywheel shaft is horizontally connected between the two flywheel support plates through bearings.

3. The generator tester according to claim 1, characterized in that: The fixing device includes a generator mounting plate, on which a generator mounting hole is opened. A generator locking bolt leading to the generator mounting hole is threadedly connected to the generator mounting plate.

4. The generator tester according to claim 1, wherein: The connecting device includes a coupling and a docking shaft. The coupling is respectively connected with the flywheel shaft and the docking shaft. A docking hole for docking and fixing with the rotating shaft of the generator under test is opened at the center of the outer end face of the docking shaft.

5. The generator tester according to claim 4, characterized in that: The docking hole is a D-shaped hole having the same shape as the rotating shaft of the generator under test; or, the docking hole is a circular hole having the same shape as the rotating shaft of the generator under test, and a rotating shaft locking bolt leading to the circular hole is threadedly connected to the docking shaft.

6. The generator tester according to claim 1, wherein: The braking device includes a brake pad and a driving device for driving the brake pad to approach and move away from the flywheel.

7. The generator tester according to claim 6, characterized in that: The driving device includes an arc-shaped brake pad mounting plate. The middle of the brake pad mounting plate is rotatably connected between two support plates. The brake pad is fixed to one end of the brake pad mounting plate. A pushing device and a return spring are connected to the other end of the brake pad mounting plate. The other end of the return spring is connected with a spring baffle. The pushing device is a manual push rod or a wire-pulling motor.

8. The generator tester according to any one of claims 1-7, characterized in that: It further includes a detection device, which is fixed on the test bench. The detection device includes a switching power supply, a first-stage voltage stabilizing circuit, a second-stage voltage stabilizing circuit and a controller that are electrically connected in sequence. The first-stage voltage stabilizing circuit is electrically connected with an electronic load meter. The switching power supply is also sequentially connected with a relay, a brushless motor driver and a three-phase socket. The three-phase socket is also sequentially connected with a rectifier bridge circuit and an electronic load meter. The electronic load meter is electrically connected with the controller. The relay is electrically connected with the controller through a relay controller. One wiring point of the three-phase socket is electrically connected with the controller through a motor back electromotive force speed measurement circuit. The controller is also electrically connected with a screen and a number of control buttons.

9. The generator tester according to claim 8, characterized in that: It further includes a decibel meter for detecting the noise of the generator under test.

10. The generator tester according to claim 9, characterized in that: The three-phase socket is a 3PIN socket, and the controller is an MCU.

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