阅读说明：本技术 一种电机运行状态监测系统 (Motor running state monitoring system ) 是由 左青松 于 2019-11-13 设计创作，主要内容包括：本发明提供一种电机运行状态监测系统,其包括传感器模块、数据分析模块以及通信模块,其中,传感器模块包括温度传感器、振动传感器、图像传感器、电流传感器、声音传感器以及湿度传感器,数据分析模块包括数据处理单元、信号处理电路以及图像处理单元,通信模块包括处理器和无线通信芯片,对电机运行时的温度信号、振动信号、图像信息、电流信号、声音信号以及湿度信号进行实时监测,不仅监测参数全面,还使用数据处理单元、信号处理电路以及图像处理单元提高了温度检测、振动检测以及图像检测的精度。(The invention provides a motor running state monitoring system which comprises a sensor module, a data analysis module and a communication module, wherein the sensor module comprises a temperature sensor, a vibration sensor, an image sensor, a current sensor, a sound sensor and a humidity sensor, the data analysis module comprises a data processing unit, a signal processing circuit and an image processing unit, the communication module comprises a processor and a wireless communication chip, and the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal during the running of a motor are monitored in real time.)

1. A motor running state monitoring system is characterized by comprising a sensor module, a data analysis module and a communication module, wherein the output end of the sensor module is connected with the input end of the data analysis module, the output end of the sensor module is also connected with the input end of the communication module, and the output end of the data analysis module is connected with the input end of the communication module; the sensor module comprises a temperature sensor, a vibration sensor, an image sensor, a current sensor, a sound sensor and a humidity sensor, the data analysis module comprises a data processing unit, a signal processing circuit and an image processing unit, and the communication module comprises a processor and a wireless communication chip;

the temperature sensor is used for detecting a temperature signal in a motor shell when the motor works, the vibration sensor is used for detecting a vibration signal of a rotating shaft when the motor works, the image sensor is used for detecting image information of the motor when the motor works, the current sensor is used for detecting a current signal of the motor when the motor works, the sound sensor is used for detecting a sound signal of the motor when the motor works, and the humidity sensor is used for detecting a humidity signal in the motor shell when the motor works; the output end of the temperature sensor is connected with the input end of the data processing unit, the output end of the vibration sensor is connected with the input end of the signal processing circuit, the output end of the image sensor is connected with the input end of the image processing unit, the output end of the data processing unit, the output end of the signal processing circuit, the output end of the image processing unit, the output end of the current sensor, the output end of the sound sensor and the output end of the humidity sensor are all connected with the input end of the processor, the temperature sensor transmits the collected temperature signal to the data processing unit, the data processing unit transmits the processed temperature signal to the processor after performing signal processing on the received temperature signal, and the vibration sensor transmits the collected vibration signal to the signal processing circuit, the signal processing circuit carries out signal processing to the vibration signal that receives after the vibration signal transmission that will process extremely the treater, image sensor with the image information transmission who gathers extremely image processing unit, image processing unit carries out image processing to the image information that receives after with the image information transmission that will process extremely the treater, current sensor with the current signal transmission who gathers extremely the treater, sound sensor with the sound signal transmission who gathers extremely the treater, humidity transducer with the humidity signal transmission who gathers extremely the treater, the treater passes through wireless communication chip with received temperature signal, vibration signal, image information, current signal, sound signal and humidity signal and transmits to remote monitoring end.

2. The motor running state monitoring system according to claim 1, wherein the remote monitoring end comprises a display device and a storage device, the display device is used for displaying the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end, and the storage device is used for storing the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end; the storage equipment further comprises a data reading interface, and the peripheral equipment reads the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal stored in the storage equipment through the data reading interface.

3. The motor operation state monitoring system according to claim 1, wherein the temperature sensor is configured to detect a temperature signal in a motor housing when the motor is in operation, the temperature sensor transmits the collected temperature signal to the data processing unit, the data processing unit performs denoising processing on the received temperature signal and then transmits the processed temperature signal to the processor, and the data processing unit performs denoising processing on the received temperature signal as follows:

s1: the temperature signal collected by the temperature sensor is represented as x (t), and since the temperature sensor may be mixed with a noise signal when collecting the temperature signal, the temperature signal x (t) is represented as:

wherein s (t) is a valid signal, r (t) is a noise signal,

s2: simplify the noise to power frequency signal, then have:

s3: the noise signals are subjected to quadrature separation, and the following are obtained:

thus, the temperature signal x (t) is split into three signals:

s4: the three separated signals are represented in a matrix form:

；

s5: separating the valid signal s (t) into z (t) and

by regulating

the data processing unit transmits the smoothed temperature signal z (t) to the processor.

4. The system for monitoring the operating condition of the motor according to claim 1, wherein the vibration sensor is configured to detect a vibration signal of the rotating shaft of the motor during operation, convert the collected vibration signal into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplifying unit and a signal filtering unit, an output end of the vibration sensor is connected to an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected to an input end of the signal filtering unit, and an output end of the signal filtering unit is connected to an input end of the processor.

5. The motor operation state monitoring system according to claim 4, wherein the signal amplifying unit includes operational amplifiers a1-a2 and resistors R1-R8;

wherein, the output end of the vibration sensor is connected with one end of a resistor R3, one end of a resistor R2 is connected with a DC power supply Vcc, the other end of a resistor R2 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a resistor R3, one end of a resistor R1 is further connected with the non-inverting input end of an operational amplifier A1, one end of a resistor R5 is connected with the output end of an operational amplifier A1, one end of a resistor R5 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R5 is connected with one end of a resistor R4, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the other end of a resistor R4, one end of a resistor R7 is grounded, the other end of a resistor R7 is connected with the other end of a resistor R4, one end of a resistor, one end of the resistor R8 is also connected with the inverting input end of the operational amplifier A2, the other end of the resistor R8 is connected with the output end of the operational amplifier A2, and the output end of the operational amplifier A2 is connected with the input end of the signal filtering unit.

6. The motor operation state monitoring system according to claim 5, wherein the signal filtering unit comprises resistors R9-R12, capacitors C1-C4 and an operational amplifier A3;

wherein, the output end of the signal amplification unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R9, the other end of a resistor R9 is connected with one end of a capacitor C2, the other end of a resistor R9 is further connected with one end of a capacitor C3, the other end of a capacitor C2 is connected with one end of a resistor R10, the other end of a resistor R10 is connected with one end of a resistor R11, the other end of a resistor R11 is connected with the other end of a capacitor C3, the other end of a resistor R11 is further connected with the inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier A3, one end of a resistor R82 12 is connected with one end of a capacitor C3, the other end of a resistor R12 is connected with the non-inverting input end of an operational amplifier A3, the other end of a resistor R12 is further connected with a dc power supply Vcc, one end of a capacitor, the signal filtering unit transmits a voltage signal V1 to the processor.

7. The motor running state monitoring system according to claim 1, wherein the image sensor transmits the acquired image information to the image processing unit for image processing;

wherein, the image transmitted to the image processing unit by the image sensor is defined as a two-dimensional function f (x, y), where x and y are space coordinates, the image processing unit adjusts the brightness of the image f (x, y), and the two-dimensional function of the image after brightness adjustment is g (x, y), where the brightness range of the image f (x, y) is [ a, b ], the brightness range of the image g (x, y) after brightness adjustment by the image processing unit is [ c, d ], and the unit of a, b, c, d is nits, there are,

the image processing unit transmits the processed image g (x, y) to the processor.

8. The motor operating condition monitoring system according to any one of claims 1 to 7, wherein the processor is an Atmega128L processor.

9. An electric motor operating condition monitoring system according to any of claims 1-7, characterized in that the wireless communication chip is a CC2420 chip.

Technical Field

The invention relates to the field of intelligent electromechanics, in particular to a motor running state monitoring system.

Background

Device condition monitoring technology was first developed in the united states in the second half of the 20 th century 60 s, with the initial objective of early monitoring of abnormal conditions in aerospace, nuclear and military equipment. Since the 80 s of the 20 th century, with the development of sensor technology, computer technology and communication technology, equipment condition monitoring technology has been gradually applied to medium and large-sized motors.

Medium and large motors are expensive in manufacturing cost and complex in structure, and once damaged, the required overhaul period is long, so that the high operation reliability is required. Therefore, the method has important practical significance for carrying out online monitoring and diagnosis on the large-scale unit and early warning to prevent accidents or enlarge. Monitoring and fault diagnosis of large motors are an important research subject in the field of electricians, and in recent decades, research on online monitoring and diagnosis technology is developed in many countries in the world and gradually popularized and applied. The motor state monitoring technology can scan the current 'health' condition of the motor, provide necessary information for operation and maintenance personnel, help the personnel get rid of the dilemma of passive maintenance and less-ideal regular maintenance, reasonably arrange maintenance work according to the actual operation condition in the equipment and realize the so-called 'foreknowledge' maintenance. Therefore, the loss caused by the sudden damage and the stop of the equipment can be avoided, and the function of the equipment can be fully exerted.

In order to ensure the safe and reliable operation of medium and large-sized motors, scientific researchers at home and abroad have developed a great deal of research on state monitoring technology in about 5 years, various types of monitoring methods are designed aiming at the characteristic parameters of the motor operation state, the design of a motor operation state monitoring system is continuously improved and perfected, and scientific research achievements are popularized and applied.

Generally, the monitoring of the running state of the motor is based on the following monitoring methods:

(1) electrical analysis method. When the stator or the rotor of the motor fails, the magnetic flux inside the motor changes in the radial direction and the circumferential direction, and the changes of the internal electric potential and the magnetic field also cause the terminal voltage and the current of the motor to change. Therefore, the electrical analysis method is to display the change of the motor state by measuring these externally detectable physical quantities. Electrical analysis methods include stator discharge monitoring, stator/rotor current monitoring, shaft voltage, shaft current, shaft flux, etc.

(2) Chemical monitoring. Both the insulation materials and the lubricating oil used in the motor have a problem of deterioration after heat and electric action. Degradation can produce large amounts of chemicals in gaseous, liquid and solid states. The chemical detection method is to analyze the concentration of some components in these decomposed substances to determine the current operation state of the motor, such as smoke monitoring, particle monitoring, gas chromatography and mass spectrometry, and debris particle detection.

(3) Temperature monitoring method. The highest temperature that the insulation of motor can bear usually determines the rated capacity of motor, therefore the monitoring motor local temperature, or the average temperature rise in the measurement motor can all be fine response motor whether breaks down. The main methods of temperature measurement include measuring the local temperature of some parts inside the motor, finding and monitoring the temperature of the hottest point inside the motor, measuring the temperature distribution inside the motor or the average temperature rise of the cooling medium calculated by volume, etc.

(4) And (5) a vibration monitoring method. The motor system may vibrate freely at a fixed frequency or may be forced to vibrate at multiple frequencies. The vibration monitoring method analyzes and discovers the mechanical fault of the motor through the research on the vibration source of the motor. The main aspects of the motor vibration study include the response of the stator core to the forces acting between the rotor and the stator, the response of the stator end winding to the electromagnetic forces acting on the winding conductors, the rotor dynamics, the characteristics of the bearing vibration, etc.

In the last 5 years, the research on the monitoring method of the motor running state at home and abroad is remarkably developed on the basis of the method, and the monitoring effect and the monitoring means are greatly improved. The current monitoring method for comparing the running state with the mature running state of the motor comprises the following steps:

(1) electrical parameter monitoring techniques. The method comprises measuring partial discharge parameters of the motor, analyzing voltage and current of the motor under dynamic and static conditions, and analyzing induced magnetic field waveform frequency and amplitude variation of the motor

(2) Temperature parameter monitoring technology. Such as a method of measuring the temperature by monitoring infrared rays radiated when the rotor generates heat according to a monitoring method of directly reflecting the temperature of the stator winding by the stator resistance, an intermittent equivalent direct current perfusion method, and the like.

(3) Mechanical property monitoring techniques. The method comprises the study on the vibration characteristics and the abrasion condition of the motor, such as the study on the dynamic characteristics of torsional vibration through the rotation speed fluctuation of an elastic rotating shaft and a motor shaft, the recording of motor noise by adopting a low-level audio function, the monitoring of the motor state through the abrasion degree of a motor bearing and the like.

Disclosure of Invention

Therefore, in order to overcome the above problems, the present invention provides a motor operation state monitoring system, which includes a sensor module, a data analysis module and a communication module, wherein an output end of the sensor module is connected to an input end of the data analysis module, an output end of the sensor module is further connected to an input end of the communication module, and an output end of the data analysis module is connected to an input end of the communication module; wherein, the sensor module includes temperature sensor, vibration sensor, image sensor, current sensor, sound sensor and humidity transducer, data analysis module includes data processing unit, signal processing circuit and image processing unit, communication module includes treater and wireless communication chip, temperature signal when moving to the motor, vibration signal, image information, current signal, sound signal and humidity signal carry out real-time supervision, not only the monitoring parameter is comprehensive, still use data processing unit, signal processing circuit and image processing unit have improved temperature detection, vibration detection and image detection's precision.

The motor running state monitoring system comprises a sensor module, a data analysis module and a communication module, wherein the output end of the sensor module is connected with the input end of the data analysis module, the output end of the sensor module is also connected with the input end of the communication module, and the output end of the data analysis module is connected with the input end of the communication module; the sensor module comprises a temperature sensor, a vibration sensor, an image sensor, a current sensor, a sound sensor and a humidity sensor, the data analysis module comprises a data processing unit, a signal processing circuit and an image processing unit, and the communication module comprises a processor and a wireless communication chip.

The temperature sensor is used for detecting a temperature signal in a motor shell when the motor works, the vibration sensor is used for detecting a vibration signal of a rotating shaft when the motor works, the image sensor is used for detecting image information when the motor works, the current sensor is used for detecting a current signal when the motor works, the sound sensor is used for detecting a sound signal when the motor works, and the humidity sensor is used for detecting a humidity signal in the motor shell when the motor works; the output end of the temperature sensor is connected with the input end of the data processing unit, the output end of the vibration sensor is connected with the input end of the signal processing circuit, the output end of the image sensor is connected with the input end of the image processing unit, the output end of the data processing unit, the output end of the signal processing circuit, the output end of the image processing unit, the output end of the current sensor, the output end of the sound sensor and the output end of the humidity sensor are all connected with the input end of the processor, the temperature sensor transmits the collected temperature signal to the data processing unit, the data processing unit transmits the processed temperature signal to the processor after performing signal processing on the received temperature signal, the vibration sensor transmits the collected vibration signal to the signal processing circuit, the signal processing circuit transmits the processed vibration signal to the processor after performing signal processing on the received vibration signal, image sensor transmits the image information who gathers to image processing unit, image processing unit carries out image processing to the image information who receives after with the image information transmission of handling to the treater, current sensor transmits the current signal who gathers to the treater, sound sensor transmits the sound signal who gathers to the treater, humidity transducer transmits the humidity signal who gathers to the treater, the treater passes through wireless communication chip with the temperature signal who receives, vibration signal, image information, current signal, sound signal and humidity signal and transmits to remote monitoring end.

Preferably, the remote monitoring end comprises a display device and a storage device, the display device is used for displaying the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end, and the storage device is used for storing the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end; the storage equipment also comprises a data reading interface, and the peripheral equipment reads the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal which are stored in the storage equipment through the data reading interface.

Preferably, the temperature sensor is used for detecting a temperature signal in the motor shell when the motor works, the temperature sensor transmits the collected temperature signal to the data processing unit, the data processing unit performs denoising processing on the received temperature signal and then transmits the processed temperature signal to the processor, and the data processing unit performs denoising processing on the received temperature signal as follows:

s1: the temperature signal collected by the temperature sensor is represented as x (t), and since the temperature sensor may be mixed with a noise signal when collecting the temperature signal, the temperature signal x (t) is represented as:

。

wherein s (t) is a valid signal, r (t) is a noise signal,

、

are weighting parameters.

S2: simplify the noise to power frequency signal, then have:

。

s3: the noise signals are subjected to quadrature separation, and the following are obtained:

。

thus, the temperature signal x (t) is split into three signals:

、

、

。

s4: the three separated signals are represented in a matrix form:

。

s5: separating the valid signal s (t) into z (t) and

。

by regulating

、

So as to smooth the z (t) signal, and the smoothed z (t) signal is the effective signal processed by the signal processing unit.

The data processing unit transmits the smoothed temperature signal z (t) to the processor.

Preferably, the vibration sensor is used for detecting a vibration signal of the rotating shaft of the motor during operation, converting the collected vibration signal into a voltage signal V0, and transmitting the voltage signal V0 to the signal processing circuit, wherein V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit comprises a signal amplifying unit and a signal filtering unit, an output end of the vibration sensor is connected with an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected with an input end of the signal filtering unit, and an output end of the signal filtering unit is connected with an input end of the processor.

Preferably, the signal amplifying unit includes operational amplifiers a1-a2 and resistors R1-R8.

Wherein, the output end of the vibration sensor is connected with one end of a resistor R3, one end of a resistor R2 is connected with a DC power supply Vcc, the other end of a resistor R2 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a resistor R3, one end of a resistor R1 is further connected with the non-inverting input end of an operational amplifier A1, one end of a resistor R5 is connected with the output end of an operational amplifier A1, one end of a resistor R5 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R5 is connected with one end of a resistor R4, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the other end of a resistor R4, one end of a resistor R7 is grounded, the other end of a resistor R9 is connected with the other end of a resistor R4, one end of a resistor, one end of the resistor R8 is also connected to the inverting input terminal of the operational amplifier a2, the other end of the resistor R8 is connected to the output terminal of the operational amplifier a2, and the output terminal of the operational amplifier a2 is connected to the input terminal of the signal filtering unit.

Preferably, the signal filtering unit includes resistors R9-R12, capacitors C1-C4, and an operational amplifier A3.

Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R9, the other end of a resistor R9 is connected with one end of a capacitor C2, the other end of a resistor R9 is further connected with one end of a capacitor C3, the other end of a capacitor C2 is connected with one end of a resistor R10, the other end of a resistor R10 is connected with one end of a resistor R11, the other end of a resistor R11 is connected with the other end of a capacitor C3, the other end of a resistor R11 is further connected with the inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier A3, one end of a resistor R12 is connected with one end of a capacitor C3, the other end of a resistor R12 is connected with the non-inverting input end of an operational amplifier A3, the other end of a resistor R12 is further connected with a Vcc power supply, one end of a capacitor, the signal filtering unit transmits the voltage signal V1 to the processor.

Preferably, the image sensor transmits the acquired image information to the image processing unit for image processing.

Wherein, the image transmitted from the image sensor to the image processing unit is defined as a two-dimensional function f (x, y), where x and y are space coordinates, the image processing unit adjusts the brightness of the image f (x, y), and the two-dimensional function of the image after brightness adjustment is g (x, y), where the brightness range of the image f (x, y) is [ a, b ], the brightness range of the image g (x, y) after brightness adjustment by the image processing unit is [ c, d ], the unit of a, b, c, d is nits, there are,

。

the image processing unit transmits the processed image g (x, y) to the processor.

Preferably, the processor is an Atmega128L processor.

Preferably, the wireless communication chip is a CC2420 chip.

Compared with the prior art, the invention has the following beneficial effects:

(1) the motor running state monitoring system provided by the invention comprises a sensor module, a data analysis module and a communication module, wherein the output end of the sensor module is connected with the input end of the data analysis module; wherein, the sensor module includes temperature sensor, vibration sensor, image sensor, current sensor, sound sensor and humidity transducer, data analysis module includes data processing unit, signal processing circuit and image processing unit, communication module includes treater and wireless communication chip, temperature signal when moving to the motor, vibration signal, image information, current signal, sound signal and humidity signal carry out real-time supervision, not only the monitoring parameter is comprehensive, still use data processing unit, signal processing circuit and image processing unit have improved temperature detection, vibration detection and image detection's precision.

(2) The invention also provides a motor running state monitoring system, which is characterized in that the signals collected by the vibration sensor are weak voltage signals, so that the voltage V0 output by the vibration sensor is amplified by the signal amplification unit through an operational amplifier A1-A2 and a resistor R1-R8, and the signal amplification unit consisting of the operational amplifier A1-A2 and the resistor R1-R8 only has drift of 2.45 mu V/DEG C, offset within 2 mu V, 100pA bias current and noise of 3.15nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R9-R12, capacitors C1-C4 and an operational amplifier A3 to filter the amplified electric signals, so that the vibration detection precision is improved.

(3) The invention also provides a motor running state monitoring system, which is characterized in that an image f (x, y) acquired by an image sensor is a nonlinear function, when the brightness of the image f (x, y) is adjusted, a projection concept is introduced, the brightness of the image f (x, y) is transformed by projecting the image f (x, y), specifically, a logarithmic function is combined with an exponential function to complete projection, the brightness adjustment can be more accurate, the brightness range of the adjusted image h (x, y) is [ c, d ], the brightness of the image is projected into a target range by using the logarithmic combination exponential function, and the projection accuracy is higher.

Drawings

FIG. 1 is a schematic view of a motor operating condition monitoring system of the present invention;

FIG. 2 is a waveform diagram of a temperature signal before and after signal processing by the data processing unit according to the present invention;

fig. 3 is a circuit diagram of the signal processing circuit of the present invention.

Detailed Description

The following describes the motor operation state monitoring system according to the present invention in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the motor operating state monitoring system provided by the present invention includes a sensor module, a data analysis module and a communication module, wherein an output end of the sensor module is connected to an input end of the data analysis module, an output end of the sensor module is further connected to an input end of the communication module, and an output end of the data analysis module is connected to an input end of the communication module; the sensor module comprises a temperature sensor, a vibration sensor, an image sensor, a current sensor, a sound sensor and a humidity sensor, the data analysis module comprises a data processing unit, a signal processing circuit and an image processing unit, and the communication module comprises a processor and a wireless communication chip.

The temperature sensor is used for detecting a temperature signal in a motor shell when the motor works, the vibration sensor is used for detecting a vibration signal of a rotating shaft when the motor works, the image sensor is used for detecting image information when the motor works, the current sensor is used for detecting a current signal when the motor works, the sound sensor is used for detecting a sound signal when the motor works, and the humidity sensor is used for detecting a humidity signal in the motor shell when the motor works; the output end of the temperature sensor is connected with the input end of the data processing unit, the output end of the vibration sensor is connected with the input end of the signal processing circuit, the output end of the image sensor is connected with the input end of the image processing unit, the output end of the data processing unit, the output end of the signal processing circuit, the output end of the image processing unit, the output end of the current sensor, the output end of the sound sensor and the output end of the humidity sensor are all connected with the input end of the processor, the temperature sensor transmits the collected temperature signal to the data processing unit, the data processing unit transmits the processed temperature signal to the processor after performing signal processing on the received temperature signal, the vibration sensor transmits the collected vibration signal to the signal processing circuit, the signal processing circuit transmits the processed vibration signal to the processor after performing signal processing on the received vibration signal, image sensor transmits the image information who gathers to image processing unit, image processing unit carries out image processing to the image information who receives after with the image information transmission of handling to the treater, current sensor transmits the current signal who gathers to the treater, sound sensor transmits the sound signal who gathers to the treater, humidity transducer transmits the humidity signal who gathers to the treater, the treater passes through wireless communication chip with the temperature signal who receives, vibration signal, image information, current signal, sound signal and humidity signal and transmits to remote monitoring end.

In the above embodiment, the motor operating state monitoring system provided by the present invention includes a sensor module, a data analysis module and a communication module, wherein an output end of the sensor module is connected to an input end of the data analysis module, an output end of the sensor module is further connected to an input end of the communication module, and an output end of the data analysis module is connected to an input end of the communication module; wherein, the sensor module includes temperature sensor, vibration sensor, image sensor, current sensor, sound sensor and humidity transducer, data analysis module includes data processing unit, signal processing circuit and image processing unit, communication module includes treater and wireless communication chip, temperature signal when moving to the motor, vibration signal, image information, current signal, sound signal and humidity signal carry out real-time supervision, not only the monitoring parameter is comprehensive, still use data processing unit, signal processing circuit and image processing unit have improved temperature detection, vibration detection and image detection's precision.

When the state of the motor is monitored, a temperature sensor and a humidity sensor are arranged on the same PCB, and the humidity measurement range is 0-100% RH; the humidity measurement precision is +/-4.5% RH, the temperature measurement range is-40-123.8 ℃, the temperature measurement precision is +/-5 ℃, and the degree response time is less than or equal to 20 s.

Specifically, the remote monitoring end comprises a display device and a storage device, the display device is used for displaying the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end, and the storage device is used for storing the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal received by the remote monitoring end; the storage equipment also comprises a data reading interface, and the peripheral equipment reads the temperature signal, the vibration signal, the image information, the current signal, the sound signal and the humidity signal which are stored in the storage equipment through the data reading interface.

Specifically, temperature sensor is used for detecting the temperature signal of motor casing when the operation, and temperature sensor transmits the temperature signal who gathers to data processing unit, and data processing unit removes noise to the temperature signal who receives and handles the back and then transmits the temperature signal after handling to the treater, and data processing unit removes noise to the temperature signal who receives and handles the step as follows:

s1: the temperature signal collected by the temperature sensor is represented as x (t), and since the temperature sensor may be mixed with a noise signal when collecting the temperature signal, the temperature signal x (t) is represented as:

。

wherein s (t) is a valid signal, r (t) is a noise signal,

、

are weighting parameters.

S2: simplify the noise to power frequency signal, then have:

。

s3: the noise signals are subjected to quadrature separation, and the following are obtained:

。

thus, the temperature signal x (t) is split into three signals:

、

、

。

s4: the three separated signals are represented in a matrix form:

。

s5: separating the valid signal s (t) into z (t) and

。

by regulating

、

So as to smooth the z (t) signal, and the smoothed z (t) signal is the effective signal processed by the signal processing unit.

The data processing unit transmits the smoothed temperature signal z (t) to the processor.

Fig. 2 shows waveforms of temperature signals before and after signal processing by the data processing unit.

As shown in fig. 3, the vibration sensor is used for detecting a vibration signal of the rotating shaft of the motor during operation, converting the collected vibration signal into a voltage signal V0, and transmitting the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplifying unit and a signal filtering unit, an output end of the vibration sensor is connected with an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected with an input end of the signal filtering unit, and an output end of the signal filtering unit is connected with an input end of the processor.

Specifically, the signal amplification unit includes operational amplifiers A1-A2 and resistors R1-R8.

Wherein, the output end of the vibration sensor is connected with one end of a resistor R3, one end of a resistor R2 is connected with a DC power supply Vcc, the other end of a resistor R2 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a resistor R3, one end of a resistor R1 is further connected with the non-inverting input end of an operational amplifier A1, one end of a resistor R5 is connected with the output end of an operational amplifier A1, one end of a resistor R5 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R5 is connected with one end of a resistor R4, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the other end of a resistor R4, one end of a resistor R7 is grounded, the other end of a resistor R9 is connected with the other end of a resistor R4, one end of a resistor, one end of the resistor R8 is also connected to the inverting input terminal of the operational amplifier a2, the other end of the resistor R8 is connected to the output terminal of the operational amplifier a2, and the output terminal of the operational amplifier a2 is connected to the input terminal of the signal filtering unit.

Specifically, the signal filtering unit comprises resistors R9-R12, capacitors C1-C4 and an operational amplifier A3.

Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R9, the other end of a resistor R9 is connected with one end of a capacitor C2, the other end of a resistor R9 is further connected with one end of a capacitor C3, the other end of a capacitor C2 is connected with one end of a resistor R10, the other end of a resistor R10 is connected with one end of a resistor R11, the other end of a resistor R11 is connected with the other end of a capacitor C3, the other end of a resistor R11 is further connected with the inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier A3, one end of a resistor R12 is connected with one end of a capacitor C3, the other end of a resistor R12 is connected with the non-inverting input end of an operational amplifier A3, the other end of a resistor R12 is further connected with a Vcc power supply, one end of a capacitor, the signal filtering unit transmits the voltage signal V1 to the processor.

In the above embodiment, the noise of the signal processing circuit is within 3.15nV, the drift is 2.45 μ V/deg.c, the models of the operational amplifiers a1-a2 are all LT1012, and the model of the operational amplifier A3 is LT 1192.

In the signal amplifying unit, the resistance of the resistor R1 is 100k Ω, the resistance of the resistor R2 is 10k Ω, the resistance of the resistor R3 is 0.1 Ω, the resistance of the resistor R4 is 100k Ω, the resistance of the resistor R5 is 10k Ω, the resistance of the resistor R6 is 100 Ω, the resistance of the resistor R7 is 1k Ω, and the resistance of the resistor R8 is 99.9k Ω.

In the signal amplifying unit, a resistor R3 and a resistor R7 form a voltage divider, and here, the resistance of the resistor R3 is small, compared with the resistance of the resistor R7, so the voltage drop across the resistor R7 is small, and the resistor R3 uses a resistor with larger power because the current passing through the electron R7 is larger.

The total load of the vibration sensor is 100 omega, the current of the isomorphic resistor R3 and the resistor R7 is the ratio of the voltage value transmitted by the vibration sensor to the total load, the resistance value of the resistor R3 is set to be very small, therefore, the voltage drop at two ends of the resistor R3 is small, the voltage drop at two ends of the resistor R3 accounts for about 0.1% of the voltage value transmitted by the vibration sensor, 99.9% of voltage signals still exist at two ends of the total load, the gain of the signal amplification unit is 1000, the resistor R8 is used here, and the resistor R8 is a resistor with a high resistance value, therefore, the signal amplification unit only introduces 0.1% of measurement error, and has a high-precision test effect.

In the signal filtering unit, the resistance of the resistor R9 is 10k Ω, the resistance of the resistor R10 is 190k Ω, the resistance of the resistor R11 is 1k Ω, the resistance of the resistor R12 is 1k Ω, the capacitance of the capacitor C1 is 1 μ F, the capacitance of the capacitor C2 is 1 μ F, the capacitance of the capacitor C3 is 0.001 μ F, and the capacitance of the capacitor C4 is 0.01 μ F.

Wherein C2= C1 and has:

；

wherein f is the working frequency of the signal filtering unit.

Further, R10= R9=19 × R9.

Because the signals collected by the vibration sensor are weak voltage signals, the signal amplification unit amplifies the voltage V0 output by the vibration sensor through the operational amplifiers A1-A2 and the resistors R1-R8, and the signal amplification unit consisting of the operational amplifiers A1-A2 and the resistors R1-R8 only has drift of 2.45 mu V/DEG C, offset within 2 mu V, 100pA bias current and noise of 3.15nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R9-R12, capacitors C1-C4 and an operational amplifier A3 to filter the amplified electric signals, so that the vibration detection precision is improved.

Specifically, the image sensor transmits the acquired image information to the image processing unit for image processing.

Wherein, the image transmitted from the image sensor to the image processing unit is defined as a two-dimensional function f (x, y), where x and y are space coordinates, the image processing unit adjusts the brightness of the image f (x, y), and the two-dimensional function of the image after brightness adjustment is g (x, y), where the brightness range of the image f (x, y) is [ a, b ], the brightness range of the image g (x, y) after brightness adjustment by the image processing unit is [ c, d ], the unit of a, b, c, d is nits, there are,

。

the image processing unit transmits the processed image g (x, y) to the processor.

In the above embodiment, the image f (x, y) acquired by the image sensor is a non-linear function, and when the brightness of the image f (x, y) is adjusted, a projection concept is introduced, the brightness of the image f (x, y) is transformed by projecting the image f (x, y), specifically, the projection is completed by using a logarithmic function in combination with an exponential function, so that the brightness adjustment is more accurate, the brightness range of the adjusted image h (x, y) is [ c, d ], and the brightness of the image is projected into a target brightness range by using the logarithmic combination exponential function, so that the projection accuracy is higher.

Specifically, the processor is an Atmega128L processor.

The currently used microprocessors in the wireless sensor network are ATmega128L from Atmel corporation and MSP430 from TI corporation, and the embedded ARM processor has a considerable range of applications in the wireless sensor network, but ARM is mainly applied to a sensor network aggregation node (also called a base station node) requiring a large amount of memory and external memory, as well as high data throughput and processing capability. The price, power consumption and complexity of peripheral circuits of the sensor node are not ideal when the sensor node is used in a common sensor node. The invention adopts ultra-low power consumption single chip microcomputer Atmega128L of Atmel company in consideration of data processing capacity, output transmission rate and power consumption.

Specifically, the wireless communication chip is a CC2420 chip.

The wireless communication data processing chip adopts a CC2420 wireless communication chip designed by Chipcon company, is specially designed for a wireless sensor network, is based on the IEEE802.15.4 standard, works at 2.4 GHz, and has the characteristics of small volume and low power consumption. The peripheral circuit is simple in design and can be used only by adding few components.

In the design of the power supply, the invention adopts two power supply modes: 3V battery power and 220V alternating current power supply. As most of motor running state monitoring systems based on the wireless sensor network are not in severe environments, nearby electricity taking near the nodes is feasible. Therefore, in order to meet the requirement of the motor running state monitoring environment, the power management module adopts a 3.3V battery or 220V alternating current double-power-taking design. The 220V alternating current is converted into 5V direct current through the frequency conversion and voltage reduction of a transformer, and then is continuously reduced into 3.3V direct current through a voltage stabilizing chip. When the environment is nearby with a 220V alternating current power supply, the node works by using alternating current, and when the environment is not capable of providing 220V alternating current, the node works by using a 3.3V battery. Therefore, the energy supply of the nodes can be continuously ensured to be sufficient, and the reliability of network communication is enhanced.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.