Generator tester circuit

Abstract

The generator tester circuit comprises a switching power supply, a first-stage voltage stabilizing circuit, a second-stage voltage stabilizing circuit and a controller which are electrically connected in sequence, the first-stage voltage stabilizing circuit is electrically connected with an electronic load instrument, and the switching power supply is further electrically connected with a relay, a brushless motor driver and a three-phase socket in sequence. The three-phase socket is further electrically connected with a rectifier bridge circuit and an electronic load instrument in sequence, the electronic load instrument 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 measuring circuit, and the controller is further electrically connected with a screen and a plurality of control keys. The generator tester circuit is matched with a generator tester, a traditional motor is omitted, the influence of noise generated by the motor on generator noise detection is avoided, and the generator noise detection is more accurate.

Description

Technical Field

[0001] The utility model relates to the field of motor detection circuits, and particularly to a generator tester circuit. Background Art

[0002] After a generator is manufactured, it is necessary to inspect 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 detection. There are no problems with voltage, current, and rotational speed. However, when detecting 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 results. Summary of the Utility Model

[0004] In order to solve the above problems, the purpose of the utility model is to design a circuit used in conjunction with a generator tester to achieve the purpose of accurate detection in cooperation with the generator tester, and solve the problem that the noise of the traditional motor will be mixed with the noise of the generator, affecting the noise test results.

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

[0006] The generator tester circuit 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 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 wiring 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 and several control buttons.

[0007] As a further technical solution, it also includes a decibel meter for detecting the noise of the generator under test.

[0008] As a further technical solution, the three-phase socket is a 3PIN socket, and the controller is an MCU.

[0009] The beneficial effects of the utility model: The generator tester circuit of the utility model, in cooperation with the generator tester, omits the traditional motor, avoids the influence of the noise generated by the motor on the noise detection of the generator, and makes the noise detection of the generator more accurate. Brief Description of the Drawings

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0011] Figure 1 Is the perspective view of Embodiment 1;

[0012] Figure 2 Is the perspective view of Embodiment 1 from another angle;

[0013] Figure 3 Is the right view of Embodiment 1;

[0014] Figure 4 Is the perspective view of the braking device in Embodiment 1;

[0015] Figure 5 Is the perspective view of the connecting device in Embodiment 1;

[0016] Figure 6 Is the connection block diagram of the detection device in Embodiment 1;

[0017] Figure 7 Is the circuit diagram of the controller in Embodiment 1;

[0018] Figure 8 Is the circuit diagram of the switching power supply in Embodiment 1;

[0019] Figure 9 Is the circuit diagram of the motor back electromotive force speed measurement circuit in Embodiment 1;

[0020] Figure 10 Is the circuit diagram of the primary voltage stabilizing circuit in Embodiment 1;

[0021] Figure 11 Is the circuit diagram of the secondary voltage stabilizing circuit in Embodiment 1;

[0022] Figure 12 Is the connection diagram of the measured generator A, rectifier bridge circuit and electronic load meter circuit in Embodiment 1;

[0023] Figure 13 Is the connection diagram of the rotating shaft of the measured generator and the docking shaft in Embodiment 2;

[0024] Figure 14 Is the right view of Embodiment 2.

[0025] In the figure: A - generator under test, 1 - test bench, 11 - bottom 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 - generator tester circuit, 61 - screen. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Referring to Figures 1-6 , the generator tester includes a test bench 1. A fixing device 2 for fixing the generator A under test is provided 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 to a connecting device 4 for fixedly connecting with the rotating shaft of the generator A under test. A braking device 5 for braking the flywheel 2 is also provided on the test bench 1.

[0029] The test bench 1 includes a bottom plate 11. Two vertical and symmetric flywheel support plates 12 are fixed on the bottom plate 11. The flywheel shaft 31 is horizontally connected to the two flywheel support plates 12 through bearings.

[0030] The fixing device 2 includes a generator mounting plate 21. A generator mounting hole is provided on the generator mounting plate 21. A generator locking bolt 22 leading to the generator mounting hole is threadedly connected to the generator mounting plate 21.

[0031] The connecting device 4 includes a coupling 41 and a docking shaft 42. The coupling 41 is respectively connected to the flywheel shaft 31 and the docking shaft 42. A docking hole 421 for docking and fixing with the rotating shaft of the generator A under test is provided 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 under test.

[0032] The brake 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 part 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, if the hole is too small, the manual push rod 56 will be stuck.

[0033] Referring to Figures 6-12 , the generator tester circuit 6 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 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 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.

[0034] 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 will be made.

[0035] As a further technical solution, it also includes a decibel meter (not shown) for detecting the noise of the generator under test.

[0036] The working principle of the present utility model:

[0037] First, place the generator under test A into the generator installation hole so that the rotating shaft of the generator under test A is inserted into the docking hole 421. 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. Press the start button. The MCU controls the relay 64 to close through the relay controller. 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 the constant resistance load state (equivalent to a resistor). The generator under test A is now working in the power generation state. 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, start timing. As the mechanical energy of the flywheel 3 is consumed, the rotational speeds of both the flywheel 3 and the generator under test A are decreasing. During the entire process of the rotational speed decreasing, the MCU will record all the voltage and current values during this period. When it is detected 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 decreasing, a decibel meter is also needed to detect the noise. Manually observe 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, making the brake pad 51 contact the circumferential side surface of the flywheel 3 to achieve the purpose of braking. 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 decreasing, 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.

[0038] The present utility model abandons the traditional detection bench of motor + generator and adopts a detection bench with the structure of generator + flywheel. First, let the generator be powered on and work in the electric state to drive the flywheel to rotate, so that the flywheel stores energy. After reaching a certain rotational speed, cut off the driving voltage of the motor. The flywheel drives the generator to rotate and generate electricity, making the generator work in the power generation state. Then, conduct subsequent detection on the generator 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.

[0039] Embodiment 2

[0040] Referring to Figure 13 and Figure 14 In this embodiment, the difference from Embodiment 1 is that: the docking hole 421 is a circular hole having 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, and the wire-pulling motor 57 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.

[0041] 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 circuit, characterized in that: It includes a switching power supply, a first-level voltage stabilizing circuit, a second-level voltage stabilizing circuit and a controller that are electrically connected in sequence. The first-level voltage stabilizing circuit is electrically connected to an electronic load meter. The switching power supply is also electrically connected to a relay, a brushless motor driver and a three-phase socket in sequence. The three-phase socket is also electrically connected to a rectifier bridge circuit and an electronic load meter in sequence. The electronic load meter is electrically connected to the controller. The relay is electrically connected to the controller through a relay controller. One wiring 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 and a number of control buttons.

2. The generator tester circuit according to claim 1, wherein: It also includes a decibel meter for detecting the noise of the generator under test.

3. The generator tester circuit according to claim 1 or 2, characterized in that: The three-phase socket is a 3PIN socket, and the controller is an MCU.

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