Motor air volume detection method and device

Abstract

The invention relates to the technical field of motor detection, and discloses a motor air volume detection method and device.The method comprises the steps that an air volume detection circuit is designed and manufactured, a small wind driven generator, a power source, a voltage division circuit and a comparison circuit integrated block are adopted, a light-emitting diode is used for visual detection, and the cooling air volume of a motor is detected; based on the calibrated air volume detection device, analysis data of the detection circuit are obtained, the analysis data comprise the input voltage of the detection circuit, the environment temperature of the detection circuit and the actual resistance of the resistor of the detection circuit, the temperature coefficient of the resistor is obtained through analysis, and the stability of the voltage division circuit is optimized based on the obtained temperature coefficient. Based on the obtained input voltage of the detection circuit, a stable input voltage is obtained through processing by a digital filtering algorithm, and the stability of the detection circuit is optimized; and based on the obtained voltage signal, detecting the fault of the wind driven generator and the fault of the voltage division circuit, and generating different early warning signals.

Description

Technical Field

[0001] The present invention relates to the technical field of motor detection, and in particular to a method and device for detecting the air volume of a motor. Background Art

[0002] During the operation of the motor, the rear self-contained fan blades rotate to generate cooling airflow to cool the motor to ensure its normal operating temperature and service life; however, due to environmental factors including but not limited to dust, humidity, temperature and long-term wear of the fan blades, the air volume generated by the fan blades will change. When the air volume is insufficient, the motor will not be cooled enough, resulting in excessive internal temperature of the motor, thereby reducing the service life of the motor;

[0003] At present, due to the closed structure of the motor when it is running, it is difficult to directly observe the cooling air volume. There is also a lack of a simple and effective method to detect the cooling air volume of the running motor in real time. Abnormal cooling air volume cannot be discovered in time, which brings great challenges to the stable operation and maintenance of the motor. At the same time, the detection authenticity of the detection device and the influence of instantaneous voltage fluctuations on the detection results are also challenging. It is difficult to make timely judgments and feedback on abnormal situations that occur during the detection process. It is of great practical significance to develop a method and device that can detect the cooling air volume of the motor in real time and accurately.

[0004] To this end, the present invention provides a method and device for detecting the air volume of a motor. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for detecting the air volume of a motor, so as to solve the problem that it is difficult to directly observe the cooling air volume due to the closed structure of the motor when it is running, and there is also a lack of a simple and effective method to detect the cooling air volume of the running motor in real time, and it is impossible to detect abnormal cooling air volume in time, which brings great challenges to the stable operation and maintenance of the motor; at the same time, it is also challenging for the detection authenticity of the detection device and the influence of instantaneous voltage fluctuations on the detection results, and it is difficult to make timely judgments and feedback on abnormal situations that occur during the detection process.

[0006] In a first aspect, the present invention provides a method for detecting the air volume of a motor, comprising the following steps:

[0007] Design and manufacture the wind volume detection circuit, using a small wind turbine, power supply, voltage divider circuit comparison circuit integrated block, and use light-emitting diodes as visual detection to detect the motor cooling wind volume;

[0008] Based on the calibrated air volume detection device, the analysis data of the detection circuit is obtained, the analysis data includes the input voltage of the detection circuit, the ambient temperature of the detection circuit and the actual resistance of the resistance of the detection circuit, and the temperature coefficient of the resistance is obtained by analysis;

[0009] Based on the obtained temperature coefficient, the stability of the voltage divider circuit is optimized. Based on the obtained input voltage of the detection circuit, a stable input voltage is obtained by processing through a digital filtering algorithm to optimize the stability of the detection circuit.

[0010] Based on the voltage signal, the wind turbine fault and the voltage divider circuit fault are detected, and different warning signals are generated, including: detection device line abnormality signal, detection device component abnormality signal, fault signal and normal signal.

[0011] In a second aspect, the present invention provides a motor air volume detection system, which specifically includes the following modules:

[0012] Air volume detection module: Design and manufacture air volume detection circuit, use small wind turbine, power supply, voltage divider circuit comparison circuit integrated block, use light-emitting diode as visual detection, and detect the motor cooling air volume;

[0013] Air volume display module: Based on the standard voltage formed by the detection circuit on the sampling circuit, a corresponding output from zero to full scale is formed to 10 output terminals, and 10 LEDs are driven to light up the air volume signal strength in sequence. The larger the air volume, the higher the voltage and the more lights are lit. There is no voltage and no indication, and all standard speed lights are lit, so as to judge the level of the motor air volume;

[0014] Detection circuit optimization module: Based on the calibrated air volume detection device, the analysis data of the detection circuit is obtained. The analysis data includes the input voltage of the detection circuit, the ambient temperature of the detection circuit and the actual resistance of the detection circuit resistor. The temperature coefficient of the resistor is obtained by analysis. The stability of the voltage divider circuit is optimized based on the obtained temperature coefficient. Based on the obtained input voltage of the detection circuit, a stable input voltage is obtained by processing through a digital filtering algorithm, and the stability of the detection circuit is optimized.

[0015] Fault detection and early warning module: Based on the voltage signal, the wind turbine fault and voltage divider circuit fault are detected and different early warning signals are generated.

[0016] Beneficial effects of the present invention:

[0017] 1. By adjusting the parameters of the voltage divider circuit, the detection requirements of different motors in different air volume ranges can be met; the detection circuit can divide the input voltage into multiple levels from zero to full scale, and display it by lighting up ten LEDs in sequence to judge the air volume, perform relatively accurate classification of the air volume, and provide more information about the motor cooling air volume;

[0018] 2. Adjust the voltage divider resistor according to the obtained temperature coefficient to maintain the stability of the voltage divider output voltage and reduce the error caused by temperature changes; according to the frequency characteristics of the wind volume change when the motor is running, reasonably set the filter cutoff frequency, process the input voltage by taking the average value through multiple sampling, reduce the impact of instantaneous voltage fluctuations on the LED lighting state, set the rising and falling thresholds for each LED, prevent the LED from frequently switching states due to slight voltage fluctuations, and enhance the display stability; use the voltage sensor to monitor the output voltage of the wind turbine, detect abnormal conditions in time, calculate the theoretical voltage value of each node based on the voltage division principle, and compare it with the measured voltage to determine the abnormal conditions of each node. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 This is a flow chart of the steps of a method for detecting the air volume of a motor provided in Example 1 of the present invention;

[0021] Figure 2 is a flow chart of the steps of a method for detecting the air volume of a motor provided in Embodiment 2 of the present invention;

[0022] Figure 3 This is a simple circuit schematic diagram of a motor air volume detection device provided in Example 1 of the present invention;

[0023] Figure 4 It is a simple device schematic diagram of a motor air volume detection device provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, a motor air volume detection method provided by an embodiment of the present invention specifically includes the following steps:

[0027] Step 1: Design and manufacture an air volume detection circuit, using a small wind turbine, power supply, voltage divider circuit comparison circuit integrated block, and light-emitting diodes as a visual detection to detect the motor cooling air volume;

[0028] In some embodiments, a magnetic pole bracket is used to adsorb a small wind turbine generator to the motor blade housing, and the suction generated when the motor is running drives the wind turbine generator to generate a voltage, and a voltage divider circuit is used to form a voltage that can be detected by the detection department, and full-scale adjustment can be performed to form a sampling circuit;

[0029] The output end of the small wind turbine generator is reliably connected to the input end of the voltage divider circuit to ensure that the voltage signal can be transmitted smoothly; the output end of the voltage divider circuit is connected to the input end of the detection circuit so that the voltage after voltage division can be input into the detection circuit for further processing; the 10 output ends of the detection circuit are respectively connected to the 10 LEDs to realize the driving control of the LEDs;

[0030] Based on the standard voltage formed by the detection circuit on the sampling circuit, a corresponding output from zero to full scale is formed to 10 output terminals, driving 10 LEDs to light up the air volume signal strength in sequence. The greater the air volume, the higher the voltage, and the more lights are lit. There is no voltage and no indication, and all standard speed lights are lit, so as to judge the level of the motor air volume;

[0031] According to the specific parameters of the motor and the actual operating requirements, the voltage divider circuit is fully adjusted before the device is put into use; by adjusting the resistors and other components in the voltage divider circuit, the voltage range output by the sampling circuit is matched with the input requirements of the detection circuit, ensuring that the detection circuit can accurately convert the voltage into the corresponding air volume level output, and the entire device is calibrated to ensure that all 10 LEDs are lit at the standard motor speed as a standard indication of normal air volume;

[0032] When the motor is running, the suction generated by the blades drives the small wind turbine to rotate and generate voltage, which is processed by the voltage divider circuit to form a standard voltage and input to the detection circuit; the detection circuit drives the corresponding number of LEDs to light up according to the size of the input voltage, and the operator can judge the level of the motor air volume by observing the lighting of the LEDs;

[0033] For example, according to the parameters of the motor and the actual operation requirements, the voltage divider circuit is fully adjusted before the device is put into use. When the motor is running, the motor corresponding to the minimum wind volume of the small wind turbine runs at a low speed of 500RPM and the output voltage is V min =0.2V, the rated speed of the motor corresponding to the maximum air volume is 2500RPM, and the output voltage is V max=5V; the input voltage range accepted by the detection circuit is [0V, 4V]; calculate the voltage division coefficient The voltage divider circuit uses two series resistors R 2 and R 3 The total resistance is 100kΩ. By adjusting the resistance values ​​of the two resistors, the full-scale adjustment of the voltage divider circuit is achieved. The entire device is calibrated based on the full-scale adjustment. When the motor runs at a standard speed of 2500RPM, the output voltage of the wind turbine is 5V. After passing through the voltage divider circuit, the voltage input to the detection circuit is 4V. The detection circuit parameters are adjusted so that all ten LEDs are lit as a standard indication of normal wind volume.

[0034] The technical solution of the embodiment of the present invention is as follows: the design of the voltage divider circuit allows full-scale adjustment, which can be adjusted according to the specific parameters of different motors and actual operating requirements; by changing the parameters of components such as resistors in the voltage divider circuit, the voltage range output by the sampling circuit is matched with the input requirements of the detection circuit, thereby improving the adaptability of the detection device; it is suitable for a variety of motors, and by adjusting the parameters of the voltage divider circuit, the detection requirements of different motors under different air volume ranges can be met; the detection circuit can divide the input voltage into multiple levels from zero to full scale, and display it by lighting up ten LEDs in turn, judging the air volume situation, and relatively accurately grading the size of the air volume, providing more information about the motor cooling air volume.

[0035] Example 2

[0036] like Figure 2 As shown, based on Example 1, a motor air volume detection method provided by the embodiment of the present invention specifically includes the following steps:

[0037] Step 2: Based on the calibrated air volume detection device, the analysis data of the detection circuit is obtained, the analysis data includes the input voltage of the detection circuit, the ambient temperature of the detection circuit and the actual resistance of the detection circuit resistor, the temperature coefficient of the resistor is obtained by analysis, the stability of the voltage divider circuit is optimized based on the obtained temperature coefficient, based on the obtained input voltage of the detection circuit, a stable input voltage is obtained by processing through a digital filtering algorithm, and the stability of the detection circuit is optimized;

[0038] In some embodiments, the temperature range to be measured is determined according to the use environment and actual needs of the resistor, the resistor is placed in a constant temperature environment device, and after the temperature stabilizes, the resistance value at the temperature is measured and recorded using a digital multimeter; multiple measurements are taken at each temperature point to obtain an average value to ensure the accuracy of the measurement;

[0039] Based on the measured temperature and resistance value, the measured data is plotted on a coordinate paper with temperature as the horizontal coordinate and resistance value as the vertical coordinate to obtain a curve of resistance value changing with temperature;

[0040] Based on the obtained resistance value versus temperature curve, for a series of data points (x i ,y i ), through the formula Calculate the slope k between adjacent points i ;

[0041] Based on the slope k between adjacent points i , calculate the average value of the slope to get By formula The standard deviation of the slope was calculated;

[0042] Based on the comparison between the obtained slope standard deviation and the preset standard deviation, it is analyzed and determined whether the curve of resistance value changing with temperature is approximately a straight line;

[0043] Specifically, if the slope standard deviation is less than or equal to the preset standard deviation, it means that the curve of resistance value changing with temperature is approximately a straight line, and the temperature coefficient is marked as the slope average value.

[0044] If the slope standard deviation is greater than the preset standard deviation, it means that the curve of resistance value changing with temperature cannot be approximated as a straight line. According to the least squares method, the straight line equation y=a+bx is selected as the fitting model. The estimated values ​​of a and b are calculated, and the temperature coefficient is marked as the slope b of the linear model equation;

[0045] Based on the obtained temperature coefficient, the voltage divider resistor is adjusted to return the voltage divider output voltage to a normal range;

[0046] Based on the adjusted voltage divider resistor, the detection circuit processes the voltage signal from the voltage divider circuit;

[0047] Through the filter circuit at the front end of the detection circuit, the cut-off frequency of the filter is set according to the frequency characteristics of the air volume change when the motor is running, ensuring that the normal transmission of the air volume change signal is not affected while filtering out noise;

[0048] It should be noted that when the detection circuit processes the voltage signal from the voltage divider circuit, it is affected by noise such as electromagnetic interference, resulting in unstable output; adding a filter circuit at the front end of the detection circuit and using an RC low-pass filter can effectively filter out high-frequency noise and make the voltage signal input to the detection circuit smoother and more stable;

[0049] The detection circuit divides the input voltage into multiple levels to drive the LED to light up. The sliding average filter method is used to sample the input voltage multiple times and take the average value to obtain the average input voltage.

[0050] For example, every 10 voltage values ​​are collected and averaged, and the average value is used as the basis for judging the air volume level, which can reduce the misjudgment of the LED lighting state caused by instantaneous voltage fluctuations and improve the stability and accuracy of air volume detection;

[0051] Generate a corresponding voltage signal based on the comparison of the obtained average input voltage with a standard voltage corresponding to the voltage level;

[0052] It should be noted that the average value is used as the basis for judging the air volume level to reduce the misjudgment of the LED lighting status caused by instantaneous voltage fluctuations and improve the stability and accuracy of air volume detection;

[0053] Based on the obtained voltage signal, the hysteresis interval is set through the change of air volume level to ensure the stability of the LED lighting state;

[0054] Based on any LED, set the rising threshold to Where ΔV 上 is the rising hysteresis value, ΔV 上 The value is 0.5; set the descending threshold to Where ΔV 下 is the falling hysteresis value, ΔV 下 The value is 0.5;

[0055] It should be noted that ΔV 上 and ΔV 下 The value is adjusted according to the actual situation to achieve stable display and accurate judgment of air volume.

[0056] Step 3: Based on the voltage signal, the wind turbine fault and the voltage divider circuit fault are detected, and different warning signals are generated, including: detection device line abnormality signal, detection device component abnormality signal, fault signal and normal signal;

[0057] In some specific embodiments, the output voltage is monitored and obtained in real time through a voltage sensor, and the output voltage of the wind turbine fluctuates within a certain range as the wind volume changes; when the motor is at the rated speed and the wind volume is stable, the output voltage range of the wind turbine is marked as a normal fluctuation range; the abnormal situation of the output voltage exceeding the normal range is analyzed and determined;

[0058] Specifically, if the monitored output voltage is within the normal range, a normal signal is generated. If the monitored output voltage is zero, the LED has no indication, and the motor works normally, it indicates that the internal winding of the wind turbine is short-circuited or open-circuited, and a detection device line abnormality signal is generated;

[0059] If the output voltage is continuously monitored to be higher or lower than the normal range, it indicates that there is an abnormality in the detection device component, and a detection device component abnormality signal is generated;

[0060] The voltage values ​​at both ends of the resistor and the output end are obtained through a voltmeter. According to the voltage division principle, based on the resistor value and the input voltage, the theoretical voltage value of each node is calculated;

[0061] Based on the difference between the obtained voltage value and the theoretical voltage value, the voltage deviation value is obtained by taking the absolute value;

[0062] Based on the comparison between the obtained voltage deviation value and the preset voltage deviation threshold, it is analyzed and determined whether the resistance of the voltage divider circuit is abnormal, and different signals are generated, including normal signals and fault signals;

[0063] Specifically, if the voltage deviation value is greater than or equal to a preset voltage deviation threshold, it indicates that the voltage divider circuit resistor has faults including but not limited to resistance change, open circuit and short circuit faults, and a fault signal is generated accordingly to remind the voltage divider circuit resistor to be repaired;

[0064] If the voltage deviation value is greater than or equal to the preset voltage deviation threshold, it indicates that the resistance of the voltage divider circuit is normal, and a normal signal is generated accordingly;

[0065] The technical scheme of the present invention is as follows: by measuring the resistance value multiple times at different temperature points and taking the average value, a curve of the resistance value changing with the temperature is drawn, which is convenient for intuitive analysis; judging whether the resistance-temperature relationship is linear based on the slope standard deviation, and fitting the linear equation in the nonlinear case by the least square method; adjusting the voltage divider resistance according to the obtained temperature coefficient to maintain the stability of the voltage divider output voltage and reduce the error caused by temperature change; according to the frequency characteristics of the wind volume change when the motor is running, the filter cutoff frequency is reasonably set, the input voltage is processed by taking the average value through multiple sampling, the influence of instantaneous voltage fluctuation on the lighting state of the LED is reduced, and the rising and falling thresholds are set for each LED to prevent the LED from frequently switching the state due to slight voltage fluctuation, thereby enhancing the display stability; using a voltage sensor to monitor the output voltage of the wind turbine generator, timely discovering abnormal conditions, calculating the theoretical voltage value of each node based on the voltage divider principle, and comparing it with the measured voltage to judge the abnormal condition of each node.

[0066] Example 3

[0067] Based on Example 1 and Example 2, an embodiment of the present invention provides a motor air volume detection system, which specifically includes the following modules:

[0068] Air volume detection module: Design and manufacture air volume detection circuit, use small wind turbine, power supply, voltage divider circuit comparison circuit integrated block, use light-emitting diode as visual detection, and detect the motor cooling air volume;

[0069] Air volume display module: Based on the standard voltage formed by the detection circuit on the sampling circuit, a corresponding output from zero to full scale is formed to 10 output terminals, and 10 LEDs are driven to light up the air volume signal strength in sequence. The larger the air volume, the higher the voltage and the more lights are lit. There is no voltage and no indication, and all standard speed lights are lit, so as to judge the level of the motor air volume;

[0070] Detection circuit optimization module: Based on the calibrated air volume detection device, the analysis data of the detection circuit is obtained. The analysis data includes the input voltage of the detection circuit, the ambient temperature of the detection circuit and the actual resistance of the detection circuit resistor. The temperature coefficient of the resistor is obtained by analysis. The stability of the voltage divider circuit is optimized based on the obtained temperature coefficient. Based on the obtained input voltage of the detection circuit, a stable input voltage is obtained by processing through a digital filtering algorithm, and the stability of the detection circuit is optimized.

[0071] Fault detection and early warning module: Based on the voltage signal, the wind turbine fault and voltage divider circuit fault are detected and different early warning signals are generated.

[0072] An embodiment of the present invention is described in detail above, but the content described is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention; all equivalent changes and improvements made within the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for detecting the air volume of a motor, characterized in that: The following steps are involved: Design and manufacture the wind volume detection circuit, using a small wind turbine, power supply, voltage divider circuit comparison circuit integrated block, and use light-emitting diodes as visual detection to detect the motor cooling wind volume; Based on the calibrated air volume detection device, the analysis data of the detection circuit is obtained, the analysis data includes the input voltage of the detection circuit, the ambient temperature of the detection circuit and the actual resistance of the resistance of the detection circuit, and the temperature coefficient of the resistance is obtained by analysis; Based on the obtained temperature coefficient, the stability of the voltage divider circuit is optimized. Based on the obtained input voltage of the detection circuit, a stable input voltage is obtained by processing through a digital filtering algorithm to optimize the stability of the detection circuit. Based on the voltage signal, the wind turbine fault and the voltage divider circuit fault are detected, and different warning signals are generated, including: detection device line abnormality signal, detection device component abnormality signal, fault signal and normal signal.

2. A method for detecting the air volume of a motor according to claim 1, characterized in that: The specific construction method of the detection circuit is as follows: A magnetic pole bracket is used to adsorb the small wind turbine to the motor blade housing. The wind suction generated when the motor is running drives the wind turbine to generate voltage, and a voltage divider circuit is used to form a voltage that can be detected by the detection department, and full-scale adjustment can be performed to form a sampling circuit; The output end of the small wind turbine generator is reliably connected to the input end of the voltage divider circuit to ensure that the voltage signal can be transmitted smoothly; the output end of the voltage divider circuit is connected to the input end of the detection circuit so that the voltage after voltage division can be input into the detection circuit for further processing; the 10 output ends of the detection circuit are respectively connected to the 10 LEDs to realize the driving control of the LEDs; Based on the standard voltage formed by the detection circuit on the sampling circuit, a corresponding output with a level from zero to full scale is formed to 10 output terminals, driving 10 LEDs to light up the air volume signal strength in sequence. The greater the air volume, the higher the voltage and the more lights are lit. There is no voltage and no indication, and all standard speeds are lit, so as to judge the level of the motor air volume.

3. A method for detecting the air volume of a motor according to claim 2, characterized in that: The specific method for determining the motor air volume is as follows: According to the specific parameters of the motor and the actual operating requirements, the voltage divider circuit is fully adjusted before the device is put into use; by adjusting the resistors and other components in the voltage divider circuit, the voltage range output by the sampling circuit is matched with the input requirements of the detection circuit, ensuring that the detection circuit can accurately convert the voltage into the corresponding air volume level output, and the entire device is calibrated to ensure that all 10 LEDs are lit at the standard motor speed as a standard indication of normal air volume; When the motor is running, the suction generated by the fan blades drives the small wind turbine to rotate and generate voltage, which is processed by the voltage divider circuit to form a standard voltage and input into the detection circuit; the detection circuit drives the corresponding number of LEDs to light up according to the size of the input voltage, and the operator can judge the level of the motor's air volume by observing the lighting of the LEDs.

4. A method for detecting the air volume of a motor according to claim 1, characterized in that: Said Determine the temperature range to be measured based on the use environment and actual needs of the resistor, place the resistor in a constant temperature environment device, and use a digital multimeter to measure and record the resistance value at that temperature after the temperature stabilizes; take the average value of multiple measurements at each temperature point to ensure the accuracy of the measurement; Based on the measured temperature and resistance value, the measured data is plotted on coordinate paper with temperature as the horizontal axis and resistance value as the vertical axis to obtain a curve of resistance value changing with temperature.

5. A method for detecting the air volume of a motor according to claim 4, characterized in that: The analysis method of the curve of the resistance value changing with temperature is: Based on the obtained resistance value versus temperature curve, for a series of data points (x i ,y i ), through the formula Calculate the slope k between adjacent points i ; Based on the slope k between adjacent points i , calculate the average value of the slope to get By formula The standard deviation of the slope was calculated; Based on the comparison between the obtained slope standard deviation and the preset standard deviation, it is analyzed and determined whether the curve of the resistance value changing with temperature is approximately a straight line.

6. A method for detecting the air volume of a motor according to claim 4, characterized in that: The specific analysis process of the curve of resistance value changing with temperature is as follows: If the slope standard deviation is less than or equal to the preset standard deviation, it means that the curve of resistance value changing with temperature is approximately a straight line, and the temperature coefficient is marked as the slope average value. If the slope standard deviation is greater than the preset standard deviation, it means that the curve of resistance value changing with temperature cannot be approximated as a straight line. According to the least squares method, the straight line equation y=a+bx is selected as the fitting model. The estimated values ​​of a and b are calculated, and the temperature coefficient is marked as the slope b of the straight line model equation.

7. A method for detecting the air volume of a motor according to claim 1, characterized in that: The specific process of optimizing the stability of the voltage divider circuit is as follows: Based on the obtained temperature coefficient, the voltage divider resistor is adjusted to return the voltage divider output voltage to a normal range; Based on the adjusted voltage divider resistor, the detection circuit processes the voltage signal from the voltage divider circuit; By detecting the filter circuit at the front end of the circuit, the cutoff frequency of the filter is set according to the frequency characteristics of the air volume change when the motor is running, ensuring that the normal transmission of the air volume change signal is not affected while filtering out noise.

8. A method for detecting the air volume of a motor according to claim 1, characterized in that: The specific analysis process of the stability of the detection circuit is as follows: The detection circuit divides the input voltage into multiple levels to drive the LED to light up. The sliding average filter method is used to sample the input voltage multiple times and take the average value to obtain the average input voltage. Generate a corresponding voltage signal based on the comparison of the obtained average input voltage with a standard voltage corresponding to the voltage level; Based on the voltage signal, the hysteresis interval is set through the change of air volume level to ensure the stability of the LED lighting state; Based on any LED, set the rising threshold to Where ΔV 上 is the rising hysteresis value, ΔV 上 The value is 0.5; set the descending threshold to Where ΔV 下 is the falling hysteresis value, ΔV 下 The value is 0.

5.

9. A method for detecting the air volume of a motor according to claim 1, characterized in that: The specific detection process of the wind turbine fault is as follows: The output voltage is obtained by real-time monitoring through the voltage sensor. The output voltage of the wind turbine fluctuates within a certain range as the wind volume changes. When the motor is at the rated speed and the wind volume is stable, the output voltage range of the wind turbine is marked as the normal fluctuation range. The abnormal situation of the output voltage exceeding the normal range is analyzed and judged. If the monitored output voltage is within the normal range, a normal signal is generated. If the monitored output voltage is zero, the LED has no indication, and the motor works normally, it indicates that the internal winding of the wind turbine is short-circuited or open-circuited, and a detection device line abnormality signal is generated; If the output voltage is continuously monitored to be higher or lower than the normal range, it indicates that there is an abnormality in the detection device component, and a detection device component abnormality signal is generated; The voltage values ​​at both ends of the resistor and the output end are obtained through a voltmeter. According to the voltage division principle, based on the resistor value and the input voltage, the theoretical voltage value of each node is calculated; The voltage deviation value is obtained by performing difference processing on the obtained voltage value and the theoretical voltage value and taking the absolute value.

10. A method for detecting the air volume of a motor according to claim 1, characterized in that: The specific detection process of the voltage divider circuit fault is as follows: Based on the comparison between the obtained voltage deviation value and the preset voltage deviation threshold, it is analyzed and determined whether the resistance of the voltage divider circuit is abnormal, and different signals are generated, including normal signals and fault signals; If the voltage deviation value is greater than or equal to the preset voltage deviation threshold, it indicates that the voltage divider circuit resistor has faults including but not limited to resistance change, open circuit and short circuit, and a fault signal is generated accordingly to remind the voltage divider circuit resistor to be repaired; If the voltage deviation value is greater than or equal to the preset voltage deviation threshold, it indicates that the resistance of the voltage divider circuit is normal, and a normal signal is generated accordingly.

Images