System and method for aging test of fan

Abstract

The system comprises a main control module, a current detection module and a rotating speed detection module, the current detection module and the rotating speed detection module are electrically connected with the main control module, the rotating speed detection module comprises a frequency detection unit and a first processing unit, the frequency detection unit is electrically connected with the first processing unit, and the first processing unit is electrically connected with the current detection module. And the main control module judges the quality of the to-be-tested motor through the rotating speed Fn and the current Ir. The method comprises the following steps: S1, electrically connecting a to-be-detected fan with a current detection module and a rotating speed detection module respectively; s2, starting a to-be-tested fan and the aging test fan system; s3, collecting the current Ir of the to-be-detected fan through a current detection module, and detecting the frequency Fr of the to-be-detected fan through a frequency detection unit; and S4, the first processing unit calculates the rotating speed Fn of the to-be-tested fan through the frequency Fr, and analyzes the current Ir and the rotating speed Fn through the main control module to judge the quality of the to-be-tested fan. The reliability of testing the fan can be improved.

Description

Technical Field

[0001] This invention relates to the field of electrical testing, and more particularly to a system and method for testing fans. Background Technology

[0002] Fans are used for heat dissipation in many electrical appliances, and testing the quality of fans is crucial. Since the actual speed of a fan is difficult to measure, the quality or lifespan of a fan is usually tested by measuring the current it generates during operation.

[0003] A few systems test the quality or lifespan of a fan by its rotational speed. These systems typically convert the fan's current into rotational speed. However, since the voltage and current of a fan are not always stable, the measured rotational speed is inaccurate, resulting in low reliability of the test. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a system for testing wind turbines that can improve the reliability of wind turbine testing.

[0005] One of the objectives of this invention is achieved through the following technical solution: An aging test fan system includes a main control module, a current detection module, and a speed detection module. The current detection module and the speed detection module are electrically connected to the main control module. The speed detection module includes a frequency detection unit for detecting the frequency Fr of the fan under test and a first processing unit for calculating the speed Fn from the frequency. The frequency detection unit is electrically connected to the first processing unit. The main control module determines the quality of the fan under test based on the speed Fn and the current Ir detected by the current detection module.

[0006] Preferably, the first processing unit calculates the rotational speed of the fan under test using the formula Fn=60*Fr / M, and the main control module judges the quality of the fan under test by the curve between the rotational speed Fn and the current Ir, where M is the number of poles of the motor on the fan under test.

[0007] Preferably, the rotational speed detection module further includes a wave rectifier unit, which is electrically connected to the frequency detection unit, and the wave rectifier unit includes an inverter.

[0008] Preferably, the inverter is a 74HC04 chip, and the frequency detection unit further includes a microcontroller and a frequency generator connected to the microcontroller. The frequency generator is electrically connected to the motor of the fan under test.

[0009] Preferably, the main control module includes a main control computer, a power supply, and a main control board that are electrically connected in sequence. The main control computer is an industrial control computer, and the power supply is an integrated power supply.

[0010] Preferably, the current detection module includes a data acquisition chip and a sampling resistor electrically connected to the data acquisition chip, wherein the data acquisition chip is an INA240 current acquisition chip.

[0011] Preferably, the aging test fan system further includes a temperature detection module, which includes a second processor, an analog-to-digital conversion module, and a sensor module that are electrically connected in sequence, and the second processor is electrically connected to the main control module.

[0012] The second objective of this invention is achieved by the following technical solution: A method for testing a wind turbine includes: Step S1: Electrically connect the fan under test to the current detection module and the speed detection module respectively; Step S2: Start the fan under test and the aging test fan system; Step S3: Collect the operating current Ir of the fan under test through the current detection module, and detect the operating frequency Fr of the fan under test through the frequency detection unit; Step S4: The first processing unit calculates the rotational speed Fn of the fan under test using the frequency Fr, and uses the main control module to analyze the current Ir and rotational speed Fn to determine the quality of the fan under test.

[0013] Preferably, in step S3, the frequency detection unit includes a microcontroller. The microcontroller starts timing when it detects the rising edge of the signal, counts one number every 1µs, and stops counting when the next rising edge arrives, resulting in N 1µs signals, and thus the frequency Fr of the wind turbine under test is obtained.

[0014] Preferably, in step S4, the main control module uses the function K=Fn / Ir to determine the quality of the fan under test. The more constant the value of K, the better the quality of the fan under test.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The aging test fan system disclosed in this application detects the frequency Fr of the fan under test through the frequency detection module, and then converts the frequency Fr into rotational speed through the main control module. This conversion of frequency is more stable and reliable than "converting rotational speed from current". Furthermore, this aging test fan system also uses the current Ir detected by the current detection module to test the quality of the fan under test, further improving the reliability of the system. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of the aging test fan system of the present invention; Figure 2This is a schematic diagram of the working principle of the aging test fan system of the present invention; Figure 3 This is a structural block diagram of the main control module of the present invention; Figure 4 This is a structural block diagram of the current detection module of the present invention; Figure 5 This is a structural block diagram of the rotational speed detection module of the present invention; Figure 6 This is a structural block diagram of the temperature detection module of the present invention; Figure 7 This is a structural block diagram of the frequency detection unit of the present invention; Figure 8 This is a flowchart of the wind turbine testing method of the present invention. Detailed Implementation

[0017] To better understand the specific technical solutions, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the description of this invention, it should be noted that the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0019] like Figure 1-5 As shown, this application discloses an aging test fan system, including a main control module, a current detection module, and a speed detection module. The current detection module and the speed detection module are electrically connected to the main control module. The speed detection module includes a frequency detection unit for detecting the frequency Fr of the fan under test and a first processing unit for calculating the speed Fn from the frequency. The frequency detection unit is electrically connected to the first processing unit. The main control module determines the quality of the fan under test based on the speed Fn and the current Ir detected by the current detection module.

[0020] In the above embodiment, the aging test fan system detects the frequency Fr of the fan under test through the frequency detection module, and then converts the frequency Fr into rotational speed through the main control module. This conversion of frequency is more stable and reliable than "converting rotational speed from current". Furthermore, this aging test fan system also uses the current Ir detected by the current detection module to test the quality of the fan under test, further improving the reliability of the aging test fan system.

[0021] like Figures 3-4As shown, in a preferred embodiment, the main control module includes a main control computer, a power supply, and a main control board, which are electrically connected in sequence. The main control computer is an industrial control computer, and the power supply is an integrated power supply. Preferably, the current detection module includes a data acquisition chip and a sampling resistor electrically connected to the data acquisition chip. The data acquisition chip is an INA240 current acquisition chip.

[0022] In the above embodiment, the power supply is an integrated power supply capable of outputting various high and low voltages. The main control board is an integrated circuit board, which can install multiple current detection modules and speed detection modules, thus enabling the testing of multiple fans under test. Figure 2 As shown, the sampling resistor is typically connected in series with the motor of the fan under test, and the acquisition chip is typically connected in parallel with the sampling resistor. The acquisition chip obtains the current Ir of the fan under test by sampling the current through the sampling resistor. This current acquisition chip, INA240, can withstand 80V common-mode voltage and can withstand relatively high voltages.

[0023] like Figure 5 As shown, in a preferred embodiment, the first processing unit calculates the rotational speed of the fan under test using the formula Fn = 60 * Fr / M, and the main control module judges the quality of the fan under test based on the curve between the rotational speed Fn and the current Ir, where M is the number of poles of the motor on the fan under test. The rotational speed detection module further includes a rectification unit, which is electrically connected to the frequency detection unit, and the rectification unit includes an inverter. Figure 7 As shown, the frequency detection unit further includes a microcontroller and a frequency generator connected to the microcontroller via a signal, and the frequency generator is electrically connected to the motor of the fan under test.

[0024] In the above embodiments, the fan under test is generally equipped with a motor driver chip, and the microcontroller can acquire the frequency of the fan under test through the motor driver chip. For fans without a motor driver chip, this chip can be installed on the fan. To better acquire the frequency of the fan under test, it can be electrically connected to a frequency generator. Preferably, the microcontroller is an STM32F103 chip, and the inverter is a 74HC04 chip. This inverter can invert the waveform signal acquired from the fan under test without affecting the signal frequency, and can filter out glitches to obtain a cleaner waveform signal. Figure 2 As shown, because motor drive chips typically send signals through the open collector (of a transistor or MOSFET), a pull-up resistor R is usually required when driving a fan. 拉 And pull-up resistor R 拉 A suitable power supply must be connected so that the inverter can receive the appropriate waveform signal (usually a PWM signal).

[0025] In addition, such as Figure 6 As shown, to improve the reliability of the aging test fan system, the system further includes a temperature detection module. This module comprises a second processor, an analog-to-digital converter, and a sensor module, all electrically connected in sequence. The second processor is electrically connected to the main control module. The sensor module converts the temperature of the fan under test into a current signal. The second processor converts this current signal into a digital signal and analyzes and processes the digital signal. The main control module combines the processed temperature-related digital signal with the fan current Ir or fan speed Fn to determine the temperature resistance and heat dissipation performance of the fan under test, further improving the reliability of the aging test fan system.

[0026] like Figure 8 As shown, the present invention also discloses a method for testing a wind turbine, comprising: Step S1: Electrically connect the fan under test to the current detection module and the speed detection module respectively; In step S1 above, the sampling resistor in the current detection module is electrically connected to the fan under test, and the rectifier unit of the speed detection module is electrically connected to the fan under test.

[0027] Step S2: Start the fan under test and the aging test fan system; In step S2 above, the fan under test and the aging test fan system can be started by the program or button in the main control unit.

[0028] Step S3: Collect the operating current Ir of the fan under test through the current detection module, and detect the operating frequency Fr of the fan under test through the frequency detection unit; In step S3, the current Ir is acquired by the acquisition chip in the current detection module. The frequency detection unit includes a microcontroller. When the microcontroller detects the rising edge of the waveform signal, the timer in the microcontroller starts counting, counting once every 1µs. The counting ends when the next rising edge arrives, resulting in N 1µs waveform signals, from which the frequency Fr of the wind turbine under test is obtained.

[0029] Step S4: The first processing unit calculates the rotational speed Fn of the fan under test using the frequency Fr, and uses the main control module to analyze the current Ir and rotational speed Fn to determine the quality of the fan under test.

[0030] In step S4, the rotational speed of the fan under test can be calculated using the formula Fn=60*Fr / M, where M is the number of poles on the fan motor. The main control module uses the function K=Fn / Ir to determine the quality of the fan under test. The more constant the value of K, the better the quality of the fan motor; the less constant the value of K, the less stable or poor the quality of the fan under test.

[0031] In summary, this aging test fan system or method detects the frequency Fr of the fan under test through the frequency detection module, and then converts the frequency Fr into rotational speed through the main control module. This conversion results in a more stable frequency and higher reliability. Furthermore, the current Ir detected by the current detection module is used to assess the quality of the fan under test, further enhancing reliability.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An aging test fan system, comprising a main control module, a current detection module, and a speed detection module, wherein the current detection module and the speed detection module are electrically connected to the main control module, characterized in that: The speed detection module includes a frequency detection unit for detecting the frequency Fr of the fan under test and a first processing unit for calculating the speed Fn from the frequency. The frequency detection unit is electrically connected to the first processing unit. The main control module determines the quality of the motor under test by using the speed Fn and the current Ir detected by the current detection module.

2. The aging test fan system according to claim 1, characterized in that: The first processing unit calculates the rotational speed of the fan under test using the formula Fn=60*Fr / M. The main control module judges the quality of the fan under test by the curve between the rotational speed Fn and the current Ir, where M is the number of poles of the motor on the fan under test.

3. The aging test fan system according to claim 2, characterized in that: The rotational speed detection module further includes a wave rectifier unit, which is electrically connected to the frequency detection unit, and the wave rectifier unit includes an inverter.

4. The aging test fan system according to claim 3, characterized in that: The inverter is a 74HC04 chip. The frequency detection unit also includes a microcontroller and a frequency generator connected to the microcontroller. The frequency generator is electrically connected to the motor of the fan under test.

5. The aging test fan system according to claim 1, characterized in that: The main control module includes a main control computer, a power supply, and a main control board that are electrically connected in sequence. The main control computer is an industrial control computer, and the power supply is an integrated power supply.

6. The aging test fan system according to claim 1, characterized in that: The current detection module includes a data acquisition chip and a sampling resistor electrically connected to the data acquisition chip. The data acquisition chip is an INA240 current acquisition chip.

7. The aging test fan system according to claim 1, characterized in that: The aging test fan system also includes a temperature detection module, which comprises a second processor, an analog-to-digital converter, and a sensor module that are electrically connected in sequence. The second processor is electrically connected to the main control module.

8. A method for testing a fan using the aging test fan system according to any one of claims 1-7, characterized in that, include: Step S1: Electrically connect the fan under test to the current detection module and the speed detection module respectively; Step S2: Start the fan under test and the aging test fan system; Step S3: Collect the operating current Ir of the fan under test through the current detection module, and detect the operating frequency Fr of the fan under test through the frequency detection unit; Step S4: The first processing unit calculates the rotational speed Fn of the fan under test using the frequency Fr, and uses the main control module to analyze the current Ir and rotational speed Fn to determine the quality of the fan under test.

9. The method for testing a fan according to claim 8, characterized in that: In step S3, the frequency detection unit includes a microcontroller. The microcontroller starts timing when it detects the rising edge of the signal, counts one number every 1µs, and stops counting when the next rising edge arrives, resulting in N 1µs signals, and thus the frequency Fr of the wind turbine under test is obtained.

10. The method for testing a fan according to claim 8, characterized in that: In step S4, the main control module uses the function K=Fn / Ir to determine the quality of the fan under test. The more constant the value of K, the better the quality of the fan under test.

Images