Temperature abnormity on-line monitoring system for permanent magnet synchronous motor of direct-driven water injection pump

Abstract

The utility model discloses a temperature abnormity on-line monitoring system for a permanent magnet synchronous motor of a direct-driven water injection pump, and belongs to the technical field of motor control. The temperature anomaly online monitoring system comprises a water injection pump outlet temperature integration, a motor three-phase winding temperature integration, a front and rear bearing temperature integration, a frequency converter, a PLC and an HMI man-machine interface. The temperature anomaly online monitoring system is deployed and connected through a communication line. And indirect and direct comprehensive temperature monitoring, early warning and fault-tolerant control of the water injection pump aiming at the driving permanent magnet motor are realized. According to the utility model, early warning and fault-tolerant control are carried out in a targeted manner, winding insulation failure or irreversible demagnetization of a permanent magnet caused by over-temperature of the motor is avoided, the automation degree of the frequency conversion speed regulation control device is improved, and the service life of a water injection pump motor system can be effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor measurement and control, and particularly relates to an on-line monitoring system for abnormal temperature of a permanent magnet synchronous motor of a direct-drive water injection pump. Background Technique

[0002] In recent years, due to advantages such as high power density, high efficiency, and large instantaneous power, permanent magnet synchronous motors have been widely used in fields such as industrial robots, electric vehicles, and aerospace. However, due to reasons such as complex and variable load conditions, harsh operating environments, and poor heat dissipation conditions of permanent magnet synchronous motors, the motor may have problems of excessive temperature rise, which further brings serious hidden dangers to the life, operating performance, and reliability of the motor.

[0003] The temperature monitoring systems of permanent magnet synchronous motors are mainly divided into two categories: direct measurement and indirect estimation. The direct measurement system usually requires pre-burying temperature sensors inside the motor, which changes the original mechanical and electromagnetic structure characteristics of the motor and will have a certain impact on the operating state of the motor. Moreover, the internal environmental conditions of the motor are very harsh, the sensors are extremely prone to failure, and the cost of maintenance and replacement is relatively high. In addition, it is difficult to directly measure the temperature of the motor rotor part using sensors. Therefore, this type of system is often used in laboratory research and will bring greater cost pressure in actual industrial applications.

[0004] Therefore, in view of the above technical problems, it is necessary to develop an on-line monitoring system for abnormal temperature of a permanent magnet motor for water injection pump drive to prevent insulation failure and irreversible demagnetization of permanent magnets caused by excessive temperature rise of the motor, so as to achieve the purpose of improving reliability. Content of the Utility Model

[0005] The invention purpose of the utility model is to solve the problem of on-line monitoring of abnormal temperature of a permanent magnet synchronous motor, and provides an on-line monitoring system for abnormal temperature of a permanent magnet synchronous motor of a direct-drive water injection pump. By on-line monitoring the abnormal temperature of the motor winding and permanent magnet, and carrying out targeted early warning and fault-tolerant control, it can avoid insulation failure of the winding or irreversible demagnetization of the permanent magnet caused by overheating of the motor, and can effectively improve the operating life of the water injection pump motor system and improve the system stability.

[0006] The utility model adopts the following technical solutions to achieve the above invention purpose:

[0007] An on-line monitoring system for abnormal temperature of a permanent magnet synchronous motor of a direct-drive water injection pump includes a water storage tank, a water injection pump, a permanent magnet synchronous motor, an integrated temperature of the water injection pump outlet, an integrated temperature of the motor three-phase winding, an integrated temperature of the front and rear bearings, an inverter, a PLC, and an HMI;

[0008] The water storage tank is connected to the outlet of the injection pump through a pipeline. The temperature at the outlet of the injection pump is integrally installed vertically in the middle of this pipeline. The injection pump is directly connected to the permanent magnet synchronous motor through a coupling. The frequency converter is connected to the permanent magnet synchronous motor by a cable. The frequency converter, PLC, and HMI are connected through communication interfaces. The temperature of the three-phase windings of the motor is integrally installed on the windings of the permanent magnet synchronous motor, and the temperatures of the front and rear bearings are integrally installed on the bearings of the permanent magnet synchronous motor.

[0009] Preferably, the temperature integration at the outlet of the injection pump is installed on the outlet pipeline of the injection pump by a Hirschmann temperature sensor. A pressure sensor is also installed on the outlet pipeline of the injection pump. The temperature integration at the outlet of the injection pump is connected to the PLC through a signal line, and the signal line is arranged in a closed wiring channel surrounded by a wiring trough. The Hirschmann temperature sensor measures the water outlet temperature of the injection pump, converts the physical quantity of temperature into an electrical signal and transmits it to the PLC. Through the internal part of the PLC or an external A / D conversion module, the analog temperature signal sent by the sensor is converted into a digital signal. Then, the PLC is connected to the HMI. After digital processing, the value is displayed on the human-machine interface.

[0010] Preferably, the temperature integration of the three-phase windings of the motor is fixed on the windings of the permanent magnet synchronous motor by three PT100 temperature sensors respectively for real-time temperature measurement. The motor shaft of the permanent magnet synchronous motor is connected to the gear shaft of the injection pump by a coupling. To enhance the stability of the motor driving the injection pump, a support rib plate is installed under the permanent magnet synchronous motor and fixed on the injection pump to keep the gear shaft of the injection pump and the motor shaft of the permanent magnet synchronous motor on the same horizontal line.

[0011] Preferably, the permanent magnet synchronous motor is the main drive of the injection pump. The frequency converter converts the power frequency voltage with a fixed frequency of the power grid into a voltage with an adjustable frequency. The frequency converter is connected to the PLC through a communication interface to achieve data sharing between the two. After being processed by the PLC data, it is displayed on the HMI page.

[0012] Preferably, for the temperature integration of the front and rear bearings, one PT100 temperature sensor is installed on each of the front and rear bearings of the motor, and the signal is connected to the PLC. After being processed by the PLC data, it is displayed on the HMI page to achieve temperature acquisition.

[0013] The temperature abnormal online monitoring system for the permanent magnet motor driving the injection pump is applicable to three-phase motors or multi-phase motors, and can monitor the outlet temperature of the injection pump, the temperature of the three-phase windings of the motor, the temperatures of the front and rear bearings, the stator temperature, and the rotor temperature. The PLC, HMI, and frequency converter are connected through communication interfaces to achieve data information sharing among the three, improving the automation degree of the variable frequency speed regulation control device.

[0014] Beneficial effects:

[0015] The utility model is based on the integration of the outlet temperature of the injection water pump, the integration of the three-phase winding temperature of the motor, the integration of the front and rear bearing temperatures, the frequency converter, the PLC and the HMI configuration to online monitor the temperature anomalies of the motor winding and the permanent magnet, with high temperature monitoring accuracy, and simple and reliable structure and algorithm. Early warning and fault tolerance control are carried out for the winding temperature anomaly and the permanent magnet temperature anomaly, improving the reliability and service life of the motor operation. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of an online monitoring system for temperature anomalies of a permanent magnet synchronous motor of a direct-drive injection water pump.

[0017] Figure 2 It is a mounting structure diagram of the integrated sensor for the three-phase winding temperature of the motor of the utility model.

[0018] Figure 3 It is a mounting structure diagram of the integrated sensor for the front and rear bearing temperatures of the utility model.

[0019] Figure 4 It is a mounting structure diagram of the integrated sensor for the outlet temperature of the injection water pump of the utility model.

[0020] Figure 5 It is a terminal wiring diagram of the permanent magnet motor of the utility model. Detailed Embodiment

[0021] The technical solution of the utility model will be described in detail below in conjunction with the drawings and the detailed embodiment.

[0022] As Figure 1 shown, an online monitoring system for temperature anomalies of a permanent magnet synchronous motor of a direct-drive injection water pump includes a reservoir, an injection water pump, a permanent magnet synchronous motor, the integration of the outlet temperature of the injection water pump, the integration of the three-phase winding temperature of the motor, the integration of the front and rear bearing temperatures, a frequency converter, a PLC and an HMI;

[0023] The reservoir is connected to the outlet of the injection water pump through a pipeline, and the integration of the outlet temperature of the injection water pump is vertically installed in the middle of this pipeline. The injection water pump is directly connected to the permanent magnet synchronous motor through a coupling. The frequency converter is connected to the permanent magnet synchronous motor by a cable. The frequency converter, the PLC and the HMI are connected through communication interfaces, thus completing the assembly of the online monitoring system for temperature anomalies of the permanent magnet synchronous motor of the direct-drive injection water pump.

[0024] The outlet temperature integration of the water injection pump is composed of a Hirschmann temperature sensor installed on the outlet pipeline of the water injection pump. A pressure sensor is also installed on the outlet pipeline of the water injection pump. The outlet temperature integration of the water injection pump is connected to the PLC through a signal line, and the signal line is arranged in a closed wiring channel surrounded by a wiring duct. The Hirschmann temperature sensor measures the water outlet temperature of the water injection pump, converts the physical quantity of temperature into an electrical signal and transmits it to the PLC. Through the internal PLC or an external A / D conversion module, the analog temperature signal sent by the sensor is converted into a digital signal. Then, the PLC is connected to the HMI. After digital processing, the value is displayed on the human-machine interface.

[0025] The temperature integration of the three-phase winding of the motor is composed of three PT100 temperature sensors respectively fixed on the windings of the permanent magnet synchronous motor for real-time temperature measurement. A coupling is used to connect the motor shaft of the permanent magnet synchronous motor to the gear shaft of the water injection pump. To enhance the stability of the motor driving the water injection pump, a support rib plate is installed under the permanent magnet synchronous motor and fixed on the water injection pump to keep the gear shaft of the water injection pump and the motor shaft of the permanent magnet synchronous motor on the same horizontal line.

[0026] The permanent magnet synchronous motor is the main drive of the water injection pump. The frequency converter converts the power frequency voltage with a fixed frequency of the power grid into a voltage with an adjustable frequency. The frequency converter is connected to the PLC through a communication interface to achieve data sharing between the two. After being processed by the PLC data, it is displayed on the HMI page.

[0027] For the temperature integration of the front and rear bearings, a PT100 temperature sensor is installed on each of the front and rear bearings of the motor, and the signals are connected to the PLC. After being processed by the PLC data, it is displayed on the HMI page to achieve temperature acquisition.

[0028] The frequency converter also injects a direct-axis high-frequency voltage signal into the motor. The direct-axis high-frequency response current is extracted from the motor current signal obtained by the current sensor, and the stator temperature and rotor temperature of the motor can be estimated. Then, the PLC layer determines the temperature through calculation, conversion, and look-up table. After that, the temperature information calculated by the PLC is used to judge whether temperature fault tolerance is required, and finally, the temperature display and alarm information on the HMI are updated.

[0029] Figure 2 The PT100 temperature sensors 21 are respectively installed on the three-phase windings 22 of the permanent magnet synchronous motor. In order not to affect the winding magnetic field and the internal structure of the motor, they are respectively arranged at the port positions of the A, B, and C three-phase windings and connected to the corresponding ports of the PLC by signals to complete the acquisition of analog signals.

[0030] Figure 3It is a schematic diagram of the integrated installation of the temperatures of the front and rear bearings of the motor. To avoid affecting the operation of the motor, the PT100 temperature sensor 21 is installed above the front and rear bearings 23 and is connected by a signal to the corresponding port of the PLC to complete the acquisition of the analog signals of the temperatures of the front and rear bearings of the motor.

[0031] Figure 4 It is the integration of the outlet temperature of the injection pump. The Hirschmann temperature sensor 24 is vertically installed above the outlet pipeline 25 and is connected to the corresponding interface of the PLC through a signal line. On the left is the reservoir where the slurry discharged from the injection pump will gather, and on the right is the injection pump to complete the pumping of the slurry.

[0032] Figure 5 It is a connection diagram of the motor. It can be seen from the figure that interfaces 1 and 2 are temperature detection switches, interfaces 3 and 4 are the interfaces of the PT100 sensors for the front bearing, interfaces 5 and 6 are the interfaces of the PT100 sensors for the rear bearing, interfaces 7 and 8 are the interfaces of the winding UPT100 sensors, interfaces 9 and 10 are the interfaces of the winding VPT100 sensors, interfaces 11 and 12 are the interfaces of the winding WPT100 sensors, interface 13 is for the grounding function, and interfaces 16, 17, and 18 implement the heat dissipation function of the motor and are connected to the heat dissipation fan.

[0033] The injection pump and the motor adopt a direct drive form. The coupling of the gear shaft of the injection pump and the motor shaft is directly connected to reduce the problem of increased temperature rise due to vibration during driving, enhance the system efficiency and stability. The lower part of the motor adopts a ribbed plate structure to support the motor and is fixed on the injection pump to make the motor drive the injection pump to operate smoothly.

[0034] The system proposed by the present utility model realizes the abnormal online monitoring of the three-phase windings, the front and rear bearings, the rotor temperature, the stator temperature, and the pump outlet temperature through the integration of the injection pump outlet temperature, the integration of the three-phase winding temperature of the motor, the integration of the front and rear bearing temperatures, the frequency converter, the PLC, and the HMI. The monitoring process is more stable and reliable. This system has important value for improving the reliability and service life of the motor in industrial production and applications.

[0035] It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. An online temperature anomaly monitoring system for a permanent magnet synchronous motor of a direct-drive water injection pump, characterized in that: Including water reservoir, water injection pump, permanent magnet synchronous motor, water injection pump outlet temperature integration, motor three-phase winding temperature integration, front and rear bearing temperature integration, inverter, PLC and HMI; The water reservoir is connected to the outlet of the water injection pump through a pipeline. The outlet temperature of the water injection pump is integrated and installed vertically in the middle of the pipeline. The water injection pump is directly connected to the permanent magnet synchronous motor through a coupling. The frequency converter and the permanent magnet synchronous motor are connected with a cable. The frequency converter, PLC and HMI are connected through a communication interface. The three-phase winding temperature of the motor is integrated and installed on the winding of the permanent magnet synchronous motor. The front and rear bearing temperature are integrated and installed on the bearings of the permanent magnet synchronous motor.

2. According to claim 1, a temperature anomaly online monitoring system for a permanent magnet synchronous motor of a direct-drive water injection pump is characterized in that: The outlet temperature integration of the water injection pump is installed on the outlet pipe of the water injection pump by a Hirschmann temperature sensor. The outlet pipe of the water injection pump is also equipped with a pressure sensor. The outlet temperature integration of the water injection pump is connected to the PLC through a signal line, and the signal line is arranged in a closed wiring channel surrounded by a wiring groove.

3. The temperature anomaly online monitoring system of a permanent magnet synchronous motor of a direct-drive water injection pump according to claim 2 is characterized in that: The motor three-phase winding temperature integration is achieved by fixing three PT100 temperature sensors on the windings of the permanent magnet synchronous motor respectively, and connecting the motor shaft of the permanent magnet synchronous motor with the gear shaft of the water injection pump by a coupling.

4. The temperature anomaly online monitoring system of a permanent magnet synchronous motor of a direct-drive water injection pump according to claim 3 is characterized in that: A supporting rib is installed below the permanent magnet synchronous motor and fixed on the water injection pump to keep the gear shaft of the water injection pump and the motor shaft of the permanent magnet synchronous motor on the same horizontal line.

5. The temperature anomaly online monitoring system of a permanent magnet synchronous motor of a direct-drive water injection pump according to claim 4 is characterized in that: The frequency converter is connected to the PLC via a communication interface, and the data is processed by the PLC and displayed on the HMI page.

6. The temperature anomaly online monitoring system of a permanent magnet synchronous motor of a direct-drive water injection pump according to claim 5 is characterized in that: The front and rear bearing temperatures are integrated by installing a PT100 temperature sensor on each of the front and rear bearings of the motor, and the signal is connected to the PLC, which processes the data and displays it on the HMI page.

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