CN203534846U - Motor multiparameter real-time data acquisition system - Google Patents

Abstract

The utility model discloses a motor multi-parameter real-time data acquisition system, which belongs to the technical field of motor detection. The motor multi-parameter real-time data acquisition system of the utility model is provided with a plurality of vibration sensors connected to the vibration signal conditioning circuit on the motor casing; a three-phase circuit is connected to the circuit wiring board of the motor, wherein the three-phase circuits are respectively There is a current transformer connected to the current signal conditioning circuit; there are several temperature sensors connected to the temperature signal conditioning circuit on the edge of the motor winding; the vibration signal conditioning circuit, the current signal conditioning circuit and the temperature signal conditioning circuit are connected On the data acquisition card, the data acquisition card is connected to the computer. The motor multi-parameter real-time data acquisition system of the utility model can not only monitor the vibration, current and temperature signals in real time, but also transmit these data to the upper computer to provide a basis for motor fault diagnosis and health status evaluation.

Description

Motor multi-parameter real-time data acquisition system

technical field

The utility model relates to a multi-parameter real-time data acquisition system for a motor. Via a data acquisition card, the vibration, current and temperature signals reflecting the operating condition of the motor can be collected to a computer in real time to provide a basis for subsequent motor fault diagnosis and health performance evaluation.

Background technique

When a component of the motor fails, it will be reflected in the characteristic quantities such as vibration, temperature, and current. Analyzing and diagnosing the data information of various sensors can help improve the diagnostic accuracy and the robustness of the diagnostic system.

Select the three most common types of signals in motor fault diagnosis: vibration signals, current signals, and temperature signals. These three types of signals alone or in combination reflect common motor faults such as motor rotor imbalance, eccentricity, wear, bearing faults, broken bars of cage windings, inter-turn short circuits, winding overheating, and iron core overheating. In the normal state and fault state of motor operation, the vibration signal, stator current signal and temperature signal are respectively measured under three conditions of no-load, half-load and full load. Using these data, the health performance evaluation and fault diagnosis of the motor can be realized.

Existing motor multi-parameter testers can only display test parameters on the instrument in the form of waveforms, pointers or numbers, or display fault codes. In either case, researchers cannot obtain real-time motor operation data for further information processing and analysis.

Utility model content

In order to overcome the deficiency that the existing motor multi-parameter tester can only display the test parameters on the instrument in the form of waveform, pointer, number or fault code, but cannot transmit the test data to the computer in real time, the utility model provides a motor Multi-parameter real-time data acquisition system, which can not only monitor vibration, temperature, and current signals in real time, but also transmit these data to the host computer to provide basis for motor fault diagnosis and health status assessment.

The technical scheme that the utility model solves its technical problem adopts is:

The motor multi-parameter real-time data acquisition system of the utility model is provided with a plurality of vibration sensors connected to the vibration signal conditioning circuit on the motor casing; a three-phase circuit is connected to the circuit wiring board of the motor, wherein the three-phase circuits are respectively There is a current transformer connected to the current signal conditioning circuit; there are several temperature sensors connected to the temperature signal conditioning circuit on the edge of the motor winding; the vibration signal conditioning circuit, the current signal conditioning circuit and the temperature signal conditioning circuit are connected On the data acquisition card, the data acquisition card is connected to the computer.

Due to the adoption of the above structure, the motor is Y160M2-2, with a rated power of 15kw, a rated speed of 2930r/min, a rated voltage of AC380V, and a rated current of 29A. Vibration signal measurement adopts ZRCD-21 monitoring speed sensor, which is installed on the side and top surface of the motor casing and fixed with screws. The horizontal measuring point and the vertical measuring point are at an angle of 90°, and the original vibration in the horizontal direction and vertical direction is collected respectively. Signal. The current signal detection adopts LMK-0.66 measuring current transformer, which is installed on the side of the power supply line, and measures U, V, W three-phase stator current signals respectively. LMK-0.66 measuring current transformer has a current ratio of 800:5, a capacity of 10VA, and an accuracy of 0.5. The temperature signal measurement adopts platinum resistance pt100, the temperature measurement range is -50°C ~ +850°C, the temperature measurement accuracy is <0.5°C, and the resolution is 0.1°C. The platinum resistance pt100 is pre-buried in the gap between the winding and the casing, and four pt100s are installed at equal intervals on the circumference, and a hole is drilled on the casing to lead out four resistors for temperature measurement. The motor multi-parameter real-time data acquisition system of the utility model is based on LABVIEW, data acquisition card, sensor, and signal conditioning circuit to realize real-time data acquisition of three types of parameters: motor vibration, stator current, and winding temperature; use ZRCD-21 speed sensor for monitoring, LMK -0.66 Use a current transformer and a Pt100 platinum resistor to measure the casing vibration, stator phase current, and winding temperature of the Y160M2-2 three-phase asynchronous motor respectively. Convert it into a voltage signal through the signal conditioning circuit, connect it to the data acquisition card USB-DMP609, connect it to the host computer through the USB, use the virtual instrument LABVIEW to display the curve of the signal changing with time on the computer, and save the collected data, signal time length and sampling in real time The frequency is set by the user. The motor multi-parameter real-time data acquisition system of the utility model can not only monitor the vibration, current and temperature signals in real time, but also transmit these data to the upper computer to provide a basis for motor fault diagnosis and health status evaluation.

In the motor multi-parameter real-time data acquisition system of the present utility model, the vibration sensor includes a first vibration sensor arranged on the side of the motor casing to detect vibration in the horizontal direction, and a first vibration sensor arranged on the top surface of the motor casing to detect vertical vibration Two vibration sensors; wherein the measuring point of the first vibration sensor and the measuring point of the second vibration sensor are at an angle of 90 °, and the first vibration sensor and the second vibration sensor are respectively connected to the data through a vibration signal conditioning circuit capture card.

Due to the adoption of the above structure, the vibration signal measurement adopts the ZRCD-21 monitoring vibration sensor, which is the first vibration sensor installed on the side of the motor casing to detect the vibration in the horizontal direction, and the first vibration sensor installed on the top surface of the motor casing to detect the vertical vibration. The second vibration sensor of directional vibration; the horizontal direction vibration sensor and the vertical direction vibration sensor are fixed on the casing of the motor with screws, and the signal end is drawn out by a four-core aviation plug. Since the output signal of the vibration sensor is a voltage signal, the vibration sensor The output signal of the vibration signal conditioning circuit can be selected or not selected according to the actual situation. In the practical application of the motor multi-parameter real-time data acquisition system described in this patent, if some motors with small power are used for data collection, the vibration amplitude of the motor is small when it is working, and the voltage signal output by the vibration sensor may be at the millivolt level Therefore, an amplifying circuit (vibration signal conditioning circuit) is required. Considering the practicability and universality of this utility patent, a vibration signal conditioning circuit is added to the overall structure diagram of the motor multi-parameter real-time data acquisition system, that is, a vibrating signal conditioning circuit is arranged. Adjust the gain amplifier to amplify the weak voltage signal to the volt level. The Y160M2-2 type three-phase asynchronous motor adopted in the utility model has a power of 15kw, and the vibration amplitude is large during operation, and the output signal of the vibration sensor can reach about 1V, which is larger when a fault occurs. Therefore, the utility model can directly connect the output signal of the vibration sensor to the data acquisition card without going through the vibration signal conditioning circuit. The pins of the vibration sensor in the vertical and horizontal directions are directly connected to the analog input terminals AIN1 and AIN2 of the signal acquisition card, and the pins are connected to the pins 17-19 of the data acquisition card. The frequency response range of ZRCD-21 is 10 ～1000HZ, corresponding to motor speed 600～6000r/min, its sensitivity is 280mv/cm/s. The system can not only monitor vibration signals in real time, but also transmit these data to the host computer to provide basis for motor fault diagnosis and health status assessment.

The motor multi-parameter real-time data acquisition system of the utility model is connected to the three-phase circuit through the circuit wiring board on the stator side of the motor, wherein each phase circuit is equipped with a current transformer, and the three current transformers are respectively adjusted by current signals. The circuit is connected to the data acquisition card, wherein the resistors set in the current signal conditioning circuit are respectively connected in series with each current transformer.

Due to the adoption of the above structure, the stator current signal detection adopts LMK-0.66 measuring current transformer with a current ratio of 800:5, which is installed on the side of the power supply line to measure U, V, W three-phase stator current signals respectively. Since the input signal of the data acquisition card is -5~+5v, it is necessary to convert the current signal into a voltage signal, and connect a 10Ω resistor to the output end of the current transformer used for LMK-0.66 measurement; the current of LMK-0.66 It can be seen from the ratio sum current signal conditioning circuit that the range of the measurable stator current is 0-80A, even considering the starting current, overload current and other factors, it can fully meet the measurement requirements of the motor stator current. The three 10Ω resistors share the ground, and the common ground is connected to the pins 17-19 of the data acquisition card, and the other ends of the three 10Ω resistors are respectively connected to the analog input terminals AIN3, AIN4 and AIN5 of the data acquisition card. The system can not only monitor the current signal in real time, but also transmit the data to the host computer, providing the basis for motor fault diagnosis and health status evaluation.

In the motor multi-parameter real-time data acquisition system of the present utility model, the temperature sensors are four platinum resistors evenly distributed in the circumferential direction of the motor, so that an angle of 90° is formed between two adjacent platinum resistors, and the platinum resistors are pre-buried At the gap between the motor winding and the casing, four platinum resistors are respectively connected to the data acquisition card through a temperature signal conditioning circuit, wherein the resistors set in the temperature signal conditioning circuit are connected in series with each platinum resistor.

Due to the adoption of the above structure, four platinum resistors pt100 are used for temperature signal measurement. The platinum resistors pt100 are pre-buried in the gap between the winding and the casing, and 4 are installed at equal intervals on the circumference. A hole is drilled on the casing to lead out the platinum resistor pt100. They are respectively connected in series with four 100Ω resistors, and a voltage of 5v is applied. The conditioning circuit converts the temperature change of the motor winding into a voltage signal at both ends of the platinum resistor pt100, thereby measuring the temperature. The relationship between temperature and resistance in the temperature signal conditioning circuit satisfies formula (1).

R _t = R ₀ (1+3.9083*10 ^-3 * t -5.775*10 ^-7 * t ² ) (1)

In formula (1), R ₀ is the resistance value of the platinum resistor at 0°C, R ₀ =100Ω. The temperature of the motor winding, according to the heat resistance grade of the insulating material, the maximum operating temperature is 180°C of H grade, and the platinum resistance can reach 168.46Ω. Through the temperature signal conditioning circuit, the positive terminals of the platinum resistance pt100 are respectively connected to the analog input terminals AIN6, AIN7, AIN8 and AIN9 of the data acquisition card; Then the relationship between the resistance of the thermal resistance at temperature t and the divided voltage v _i satisfies the formula (2).

R _t =100* v _i / (5- v _i  ) (2)

Formula (2) is the partial pressure at both ends of the platinum resistor. After the data acquisition card collects the partial pressure, it is substituted into formula (2) to calculate the resistance value of platinum resistor pt100 at temperature t , and then substituted into formula (1) to calculate the temperature; formula ( 1) and formula (2) can be directly displayed as temperature values on the front panel of the motor multi-parameter real-time data acquisition system after calculation through the formula node in LABVIEW. The system can not only monitor the temperature signal in real time, but also transmit the data to the host computer to provide the basis for motor fault diagnosis and health status assessment.

In summary, due to the adoption of the above technical solution, the utility model has the following two beneficial effects.

1. The motor multi-parameter real-time data acquisition system of the present utility model can not only monitor vibration, current and temperature signals in real time, but also transmit these data to the host computer. Through the interface of LABVIEW, the current operation status of the motor can be intuitively observed.

2. The multi-parameter real-time data acquisition system of the motor of the present utility model can store the collected data on the hard disk of the computer in real time, so as to be used for the analysis of the operating conditions related to the motor, and can also carry out online fault diagnosis and health performance of the motor on this basis evaluation and other studies.

Description of drawings

Fig. 1 is the overall structural diagram of the motor multi-parameter real-time data acquisition system of the present invention.

Figure 2 is a wiring diagram of the vibration sensor layout and the data acquisition card in Figure 1.

Figure 3 is the wiring diagram of current sensor layout, conversion circuit and data acquisition card in Figure 1.

Figure 4 is a wiring diagram of temperature sensor layout, conversion circuit and data acquisition card in Figure 1.

Fig. 5 is a flow chart of software design of the multi-parameter real-time data acquisition system of the motor shown in Fig. 1 .

Marks in the figure: 1-motor, 2-data acquisition card, 3-computer, 4-first platinum resistance, 5-second platinum resistance, 6-third platinum resistance, 7-fourth platinum resistance, 8-temperature signal Conditioning circuit, 9-vibration signal conditioning circuit, 10-circuit signal conditioning circuit, 11-first vibration sensor, 12-second vibration sensor, 13-first current transformer, 14-second current transformer, 15-the first Three current transformers, 16-circuit wiring board, 17-USB data line, 18-first resistor, 19-second resistor, 20-third resistor, 21-fourth resistor, 22-fifth resistor, 23-the first Six resistors, 24-seventh resistor.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figures 1 to 5, the motor multi-parameter real-time data acquisition system of the present invention is provided with several vibration sensors connected to the vibration signal conditioning circuit 9 on the casing of the motor 1, wherein the vibration sensors include a set The first vibration sensor 11 that detects horizontal direction vibration on the side surface of motor 1 casing, and the second vibration sensor 12 that detects vertical direction vibration that is located on the top surface of motor 1 casing; Wherein the measurement of the first vibration sensor 11 Point and the measuring point of the second vibration sensor 12 are at an angle of 90 °, and the first vibration sensor 11 and the second vibration sensor 12 are connected to the data acquisition card 2 by the vibration signal conditioning circuit 9 respectively; The stator is connected to the three-phase circuit through the circuit terminal board 16, wherein each phase circuit is provided with a current transformer, and the three current transformers are respectively the first current transformer 13, the second current transformer 14 and the third current transformer device 15, three current transformers are respectively connected to the data acquisition card 2 through the current signal conditioning circuit 10, wherein the resistance provided in the current signal conditioning circuit 10 is connected in series with each current transformer respectively; A number of temperature sensors connected to the temperature signal conditioning circuit 8; wherein the temperature sensors are four platinum resistors evenly distributed in the circumferential direction of the motor 1, specifically the first platinum resistor 4, the second platinum resistor 5, and the third platinum resistor 6 and the fourth platinum resistor 7, wherein any two adjacent platinum resistors form an angle of 90°, the platinum resistors are embedded in the gap between the winding of the motor 1 and the casing, and the four platinum resistors respectively pass through The temperature signal conditioning circuit 8 is connected to the data acquisition card 2, wherein the resistors provided in the temperature signal conditioning circuit 8 are respectively connected in series with each platinum resistor; wherein the vibration signal conditioning circuit 9, the circuit signal conditioning circuit 10 and the temperature signal conditioning circuit 8 are connected On the data acquisition card 2, the data acquisition card 2 is connected to the computer 3 by the USB data line 17, wherein the computer 3 is used as the upper computer, utilizes the virtual instrument LABVIEW to display the signal change curve with time, and saves the real-time acquisition data, signal time The length and sampling frequency are set by the user.

In the motor multi-parameter real-time data acquisition system of the utility model, the motor 1 is Y160M2-2, the rated power is 15kw, the rated speed is 2930r/min, the rated voltage is AC380V, and the rated current is 29A. Vibration signal measurement adopts ZRCD-21 monitoring speed sensors 11 and 12, which are installed on the side and top surface of the motor casing and fixed with screws. The horizontal measuring point and the vertical measuring point are at an angle of 90°, and the horizontal and vertical directions are respectively collected. original vibration signal. The temperature signal measurement adopts platinum resistance pt100, the temperature measurement range is -50°C ~ +850°C, the temperature measurement accuracy is <0.5°C, and the resolution is 0.1°C. The platinum resistance pt100 is pre-buried in the gap between the winding and the casing, and four platinum resistance pt100s are installed at equal intervals on the circumference, and a hole is drilled on the casing to lead out 4 resistances for temperature measurement. Current signal detection adopts LMK-0.66 measurement current transformers 13, 14 and 15, which are installed on the side of the power supply line, and measure U, V, W three-phase stator current signals respectively. LMK-0.66 measuring current transformer has a current ratio of 800:5, a capacity of 10VA, and an accuracy of 0.5.

Vibration signal measurement adopts ZRCD-21 speed sensor for monitoring, as shown in Figure 2. The first vibration sensor 11 in the horizontal direction and the second vibration sensor 12 in the vertical direction are all fixed on the casing of the motor 1 with screws, and the signal end is drawn out by a four-core aviation plug. Since the output of the vibration sensor is a standard voltage signal, the vibration sensor does not need a signal conditioning circuit to be directly connected to the data acquisition card 2 . The pin 1 of the vibration sensor in the vertical direction and the horizontal direction is directly connected to the analog input terminals AIN1 and AIN2 of the signal acquisition card 2, and the pin 4 is jointly grounded to the pins 17-19 of the data acquisition card 2. The frequency response range of ZRCD-21 is 10-1000HZ, the corresponding motor speed is 600-6000r/min, and its sensitivity is 280mv/cm/s.

As shown in Figure 3, the stator current signal detection uses LMK-0.66 measuring current transformers, which are the first current transformer 13, the second current transformer 14 and the third current transformer 15, and the current ratio is 800:5. Installed on the side of the power supply line, respectively measure U, V, W three-phase stator current signals. Since the input signal of the data acquisition card 2 is -5～+5v, the current signal needs to be converted into a voltage signal, and a 10Ω resistor 18, 19 and 20. According to the current ratio and signal conditioning circuit of LMK-0.66, the measurable sub-current range is 0-80A. Even considering the starting current, overload current and other factors, it fully meets the measurement requirements of the stator current of the motor. One end of the three 10Ω resistors 18, 19 and 20 has a common ground, and its common ground is connected to the pins 17-19 of the data acquisition card 2, and the other ends of the three 10Ω resistors 18, 19 and 20 are respectively connected to the analog quantity of the data acquisition card 2 Inputs AIN3, AIN4 and AIN5.

As shown in Figure 4, four platinum resistors pt100 are used for temperature signal measurement, which are the first platinum resistor 4, the second platinum resistor 5, the third platinum resistor 6 and the fourth platinum resistor 7. The platinum resistor pt100 is embedded in the winding and In the gap of the case, install 4 at equal intervals on the circumference. Drill a hole on the case to lead out the platinum resistance pt100, so that each pt100 platinum resistance is connected in series with a 100Ω resistor, and a 5v voltage is applied to the resistance of the pt100. The change is converted to a change in voltage across the pt100, allowing for temperature measurement.

The temperature signal is measured using a Pt100 platinum resistance, and the relationship between temperature and resistance satisfies 1.

R _t =R ₀ (1+3.9083*10 ^-3 *t-5.775*10 ^-7 *t ² ) (1)

In formula 1, R ₀ is the resistance value of the platinum resistor at 0°C, and R ₀ =100Ω. The temperature of the motor winding, according to the heat resistance grade of the insulating material, the maximum operating temperature is 180°C of H grade, and the platinum resistance can reach 168.46Ω. Pt100 platinum resistance can use the conversion circuit shown in Figure 4. The positive terminals of the four Pt100 platinum resistors are respectively connected to the analog input terminals AIN6, AIN7, AIN8 and AIN9 of the data acquisition card 2; Then the relationship between the resistance of the thermal resistance at temperature t and the divided voltage v _i satisfies formula 2.

R _t =100*v _i / (5- v _i ) (2)

Equation 2 is the partial pressure at both ends of the platinum resistor. After the data acquisition card 2 collects the partial pressure, it is substituted into Equation 2 to calculate the resistance value of pt100 at temperature t , and then substituted into Equation 1 to calculate the temperature. Equation 1 and Equation 2 can be directly displayed as temperature value on the front panel of the motor multi-parameter real-time data acquisition system through the formula node in LABVIEW.

The data acquisition system includes a USB-DMP609 data acquisition card 2 and a computer 3, and the data acquisition card 2 is connected to the computer 3 through a USB data cable 17. The virtual instrument LABVIEW displays the curves or values of vibration, current, and temperature signals over time, and saves the collected data.

Data Acquisition Card USB-DMP6092 is a USB2.0 bus 16-bit A/D data acquisition card with 16 single-ended analog inputs, built-in program-controlled gain control, onboard FIFO storage system, and can be used to set points or cycle acquisition The internal clock triggers high-speed continuous sampling with a maximum sampling frequency of 250KHz, all work in software setting mode, two 12-bit D/A outputs, 16 digital input/output full control, and bit setting and bit reading, one 16-bit Counter and frequency meter, one program-controlled wide frequency range (550Hz ~ 65KHz) pulse and various analog waveform outputs, two program-controlled adjustable base frequency pulse width modulator (PWM). Adopt USB bus, support plug and play. The USB-DMP609 data acquisition card is a non-NI data acquisition card. When writing a program with LabVIEW, you cannot directly call DAQ, but you need to write related functions and package it as a dynamic link library.DLL. In this design, DMP.dll includes the function of opening the data acquisition card HANDLE OpenDevice (unsigned char), the multi-channel scanning function Dmp609_Scan_Ad(), the clock-triggered multi-channel continuous sampling function Dmp609_Timer_Scan_Ad () and reading the data loaded on the storage board of the acquisition card Function Dmp609_Read_Ad () and so on.

The development environment of LABVIEW is divided into three parts: front panel, program panel, icon/connection port. The front panel is a graphical user interface, which displays vertical and horizontal vibration signals, U, V, W three-phase stator currents, and four-way temperature signals in the form of curves. The program panel is the program editing interface, and the program flow chart is shown in Figure 5.

In the software design of the data acquisition system, the function OpenDevice for opening the data acquisition card, the function Dmp609_Timer_Scan_Ad for continuous sampling of multi-channel scanning and the function Dmp609_Read_Ad() for reading the data in the storage board of the acquisition card are mainly used. OpenDevice opens the data card and passes the data handle to Dmp609_Timer_Scan_Ad () and Dmp609_Read_Ad(), and the multi-channel scan function and the function of reading data from the acquisition card can operate on the specified data card after receiving the data handle. Multi-channel scanning function The continuous sampling function has 7 parameters, including data handle, scanning start channel, scanning end channel, setting gain, sampling cycle status, clock cycle and function return value. Since 9 channels of data, 2 channels of vibration signals, 3 channels of current signals, and 4 channels of temperature signals are required, the interface of the data acquisition card is connected in sequence, the initial channel is set to 1, and the end channel is set to 9. In the process of collecting data, continuous collection is required, and the cycle state is set to 1. The function of reading data from the memory board of the acquisition card has 4 parameters, including the card operation data handle, the number of samples, the data conversion array and the function return.

In the continuous sampling mode triggered by the multi-channel scan clock, call the Dmp609_Timer_Scan_Ad function in the DMP609.DLL library function written in c language, triggered by the internal clock, to scan and sample the set channel, starting from the initial channel 1, adjacent channels The time difference is less than 15 us , and the sequential sampling ends at the termination channel 9. At the same time, the sampling data is written into FIFO sequentially, and then the Dmp609_Read_Ad function in the DLL library function is called to read the data. Since the collected channel value data ranges from 0 to 65535, in order to meet the actual needs, it is necessary to use the formula node in LABVIEW to pair the collected data. The corresponding A/D conversion is performed on the channel data, and the conversion formula is shown in Equation 3.

V=(dada-32767)*g/65535 (3)

In formula 3, data is the data obtained by the data acquisition card after A/D conversion, g is the gain set in the multi-channel scan clock trigger acquisition function, and V is the displayed voltage value.

Since the array data of the conversion data values of each channel returned by the Dmp609_Timer_Scan_Ad function is a global variable array defined by LABVIEW, the returned data[0] is the conversion data of the starting channel selected by start, and data[1] is the conversion of the start+1 channel data, and so on. Therefore, the array data needs to be divided into 9 sub-arrays through LABVIEW to extract the one-dimensional array function, and each sub-array can be converted by calling the formula node and using the conversion relationship between voltage, vibration, current, and temperature to obtain the corresponding The actual value collected by the channel, and then the collected data can be saved as a text file by writing the spreadsheet file function, and the waveform of each channel can be displayed through the waveform chart, and the amplitude and level measurement function can be used to extract the amplitude and level. Extract the frequency information function to measure the corresponding peak value, amplitude and frequency.

The motor multi-parameter real-time data acquisition system of the utility model can not only monitor the vibration, current and temperature signals in real time, but also transmit these data to the upper computer to provide a basis for motor fault diagnosis and health status evaluation. The data collected by it can be used for the analysis of the operating conditions related to the motor, and can also be used for research such as motor fault diagnosis and health performance assessment.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. The motor multi-parameter real-time data acquisition system is characterized in that: on the casing of the motor (1), there are several vibration sensors connected to the vibration signal conditioning circuit (9); on the circuit wiring board of the motor (1) ( 16) is connected with a three-phase circuit, in which the three-phase circuit is respectively equipped with a current transformer connected to the current signal conditioning circuit (10); on the edge of the winding of the motor (1) there are several connected to the temperature signal conditioning circuit ( 8) on the temperature sensor; wherein the vibration signal conditioning circuit (9), the current signal conditioning circuit (10) and the temperature signal conditioning circuit (8) are connected to the data acquisition card (2), and the data acquisition card (2) is connected to on computer (3). 2. The motor multi-parameter real-time data acquisition system according to claim 1, characterized in that: the vibration sensor includes a first vibration sensor (11) installed on the side of the motor (1) casing to detect horizontal vibration, And a second vibration sensor (12) arranged on the top surface of the motor (1) casing to detect vibration in the vertical direction; wherein the measuring point of the first vibration sensor (11) and the measuring point of the second vibration sensor (12) are The angle between them is 90°, and the first vibration sensor (11) and the second vibration sensor (12) are respectively connected to the data acquisition card (2) through the vibration signal conditioning circuit (9). 3. The motor multi-parameter real-time data acquisition system according to claim 1 or 2, characterized in that: the stator of the motor (1) is connected to the three-phase circuit through the circuit terminal board (16), wherein each phase circuit is There are current transformers, and the three current transformers are respectively connected to the data acquisition card (2) through the current signal conditioning circuit (10), wherein the resistors set in the current signal conditioning circuit (10) are respectively connected in series with each current transformer . 4. The motor multi-parameter real-time data acquisition system according to claim 1 or 2, characterized in that: the temperature sensor is four platinum resistors evenly distributed in the circumferential direction of the motor (1), so that two adjacent platinum resistors There is an included angle of 90° between them. The platinum resistors are pre-embedded in the gap between the motor (1) winding and the casing, and the four platinum resistors are respectively connected to the data acquisition card (2) through the temperature signal conditioning circuit (8). The resistors set in the temperature signal conditioning circuit (8) are respectively connected in series with each platinum resistor.

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