A motor drive device and method based on EPA and digital twin

Abstract

The present invention discloses a motor drive device and method based on EPA and digital twin, including a power supply module, a status detection unit, a processor unit, a power drive unit, a power inverter bridge unit, a servo sensor unit and a network interface unit. The power supply module is respectively connected in the forward direction to the status detection unit, the processor unit, the power drive unit, the power inverter bridge unit and the network interface unit. The status detection unit is sequentially connected in the forward direction to the processor unit, the power drive unit and the power inverter bridge unit. The servo sensor unit is connected in the forward direction to the processor unit. The network interface unit is connected bidirectionally to the processor unit. When in use, the power inverter bridge unit and the servo sensor are connected to the motor. The present invention can realize the networking of motor and motor drive parameters, online diagnosis and remote operation and maintenance of equipment, as well as coordinated linkage control of multi-site devices with physical isolation, and has broad application prospects and is conducive to popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drivers, and in particular to a motor driving device and method based on EPA and digital twins. Background Art

[0002] At present, the existing motor drivers are all based on RS485 or CAN interface for communication, connected to the field processor (single-chip microcomputer, PLC or industrial computer), and controlled by the control logic solidified in the field processor. The motor and motor driver are attached to the entire field equipment. As an auxiliary module of the field equipment, they are controlled by the control logic solidified by the field processor, and the flexibility of control is greatly limited; at the same time, limited by the communication rate of RS485 and CAN interfaces, the real-time status parameters of the motor and controller, such as phase current, system voltage, etc., cannot be fed back to the control end in real time and displayed and output, and the online diagnosis and real-time data analysis of the motor and motor driver cannot be realized, and possible abnormalities cannot be prevented in advance. At the same time, once an abnormal situation occurs, it will also increase the difficulty of problem analysis and repair. Therefore, it is urgent to develop a motor drive device and method based on EPA and digital twins to solve the above technical problems.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a motor drive device and method based on EPA and digital twins, which can realize the networking of motor and motor driver parameters, online diagnosis and remote operation and maintenance of equipment, and coordinated linkage control of multiple field devices with physical isolation. It has broad application prospects and is conducive to popularization and application.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a motor drive device based on EPA and digital twin, including a power module, a state detection unit, a processor unit, a power drive unit, a power inverter bridge unit, a servo sensor unit and a network interface unit, wherein the power module is forwardly connected to the state detection unit, the processor unit, the power drive unit, the power inverter bridge unit and the network interface unit respectively, the state detection unit is forwardly connected to the processor unit, the power drive unit and the power inverter bridge unit in sequence, the servo sensor unit is forwardly connected to the processor unit, and the network interface unit is bidirectionally connected to the processor unit. When in use, the power inverter bridge unit and the servo sensor are connected to the motor;

[0006] The power supply module is used to provide energy for other sub-unit circuits;

[0007] The state detection unit collects relevant control parameters of the current motor and motor driver, and feeds them back to the processor unit so as to perform various feedback closed-loop controls;

[0008] The processor unit generates different PWM waves according to the motor control law to implement the motor control algorithm;

[0009] The power inverter bridge unit is used to convert DC to AC and directly drive the motor;

[0010] The power drive unit is arranged between the processor unit and the power inverter bridge unit to improve the driving ability of the control signal output by the processor unit;

[0011] The servo sensor unit detects the position of the motor rotor relative to the stator winding for position monitoring;

[0012] The network interface unit implements the physical interface of the network layer. The processor unit quickly transmits various motor parameters collected by the motor through the state detection unit and various control parameters of the current processor unit to the Ethernet, so that the background management system can use these real-time parameters for data mapping and reconstruction, build a remote virtual image based on digital twin, observe the motor state in real time and generate high-level control decisions according to the parameters. At the same time, the network interface unit receives control commands from the management layer through the Ethernet in real time, and flexibly remotely controls the motor, making a single motor an independent network control node, no longer relying on the on-site whole machine, and having higher flexibility.

[0013] Preferably, the PWM waves include PWM1H, PWM1L, PWM2H, PWM2L, PWM3H and PWM3L.

[0014] Preferably, the servo sensor unit adopts an incremental encoder, a resolver sensor, a Hall sensor or a magnetic encoder.

[0015] Preferably, the state detection unit collects the system voltage for overvoltage and undervoltage protection, collects the phase current signal of the motor to implement the FOC algorithm, collects the bus current for overcurrent protection, and collects the temperature signal for overheat protection.

[0016] A motor drive method based on EPA and digital twin is as follows: The processor unit transmits the relevant parameter information of the motor and the motor controller to the EPA bridge through the network interface unit, realizes high-speed network transmission in the Ethernet, and the data is transmitted to the Web server through the EPA proxy. The Web server realizes data modeling and reconstruction of the motor and even the entire control system according to the detailed parameters uploaded by the device, builds virtual devices and even virtual factories, which is convenient for remote viewing, control, fault diagnosis and data analysis. At the same time, with the help of the powerful processing and computing power of the background, functions such as data statistics, networked comparative analysis and coordinated control of multiple devices are carried out for complex functions that were difficult to achieve before. Users of the remote workstation can log in to the Web server through permissions from any corner of the world to realize the viewing and control functions of on-site devices.

[0017] Preferably, the relevant parameters include full-range parameters of phase current, temperature, voltage and rotor position.

[0018] The motor drive device and method based on EPA and digital twin provided by the present invention have the following beneficial effects.

[0019] 1. The motor drive device of the present invention realizes the networking of the parameters of the motor and the motor driver by adding a network interface unit and using the EPA network, which is convenient for network remote control.

[0020] 2. The motor drive device of the present invention performs data reconstruction through the platform. Based on the digital twin technology, it builds a virtual device image, and even builds a full-system virtual image by deducing the overall system posture through the motor state, making the system parameters more intuitively presented, realizing remote viewing and operation of the device, which is beneficial to the online diagnosis of the device and fault prediction and preventive maintenance through data analysis.

[0021] 3. The motor drive device of the present invention exists as an independent network node for the motor and the motor driver, no longer relying on the on-site controller, which enables the management layer to directly control through remote operation and is convenient for coordinated linkage control of devices separated in multiple physical spaces.

[0022] 4. The motor drive method of the present invention is directly connected to the Ethernet through the EPA interface, and transmits the relevant parameters of the motor driver and the motor directly to the Ethernet, so as to realize seamless integration of information based on Ethernet at all network layers from the management layer, control layer to field devices in an intelligent factory or equipment. Users can directly access and control any motor driver and motor through their access rights anywhere in the world using common tools or software. At the same time, relying on the high-speed transmission performance of the Ethernet, data can be transmitted quickly and efficiently. By collecting information on the motor driver data and combining digital twin technology, the data is mapped and reconstructed, so as to comprehensively and truly present the current operating status of the motor driver and the motor in a three-dimensional manner on the management layer interface. Since the motor is the core of the movement of all devices, on this basis, the current status of the entire device can also be deduced according to the status of the motor, so as to realize the digital twin information of the entire system constructed based on the motor drive device of the present invention. Description of the Drawings

[0023] Figure 1 It is a structural block diagram of a motor drive device based on EPA and digital twin provided by the present invention;

[0024] Figure 2 It is a working principle diagram of a motor drive method based on EPA and digital twin provided by the present invention. Detailed Embodiments

[0025] The following further describes the present invention in conjunction with specific embodiments and drawings to help understand the content of the present invention.

[0026] Such as Figure 1As shown in the figure, it is a structural block diagram of a motor drive device based on EPA and digital twin provided by the present invention. The motor drive device based on EPA and digital twin includes a power supply module, a state detection unit, a processor unit, a power drive unit, a power inverter bridge unit, a servo sensor unit, and a network interface unit. The power supply module is respectively connected forwardly to the state detection unit, the processor unit, the power drive unit, the power inverter bridge unit, and the network interface unit. The state detection unit is sequentially connected forwardly to the processor unit, the power drive unit, and the power inverter bridge unit. The servo sensor unit is connected forwardly to the processor unit. The network interface unit is connected bidirectionally to the processor unit. When in use, the power inverter bridge unit and the servo sensor unit are connected to the motor. The power supply module is used to provide energy for other sub-unit circuits. The state detection unit collects relevant control parameters of the current motor and the motor driver and feeds them back to the processor unit for various feedback closed-loop controls. The state detection unit collects the system voltage for overvoltage and undervoltage protection, collects the phase current signal of the motor to implement the FOC algorithm, collects the bus current for overcurrent protection, and collects the temperature signal for overheat protection. The processor unit generates different PWM waves according to the motor control law. The PWM waves include PWM1H, PWM1L, PWM2H, PWM2L, PWM3H, and PWM3L, which are used to implement the motor control algorithm. The power inverter bridge unit is used to convert direct current to alternating current and directly drive the motor. The power drive unit is arranged between the processor unit and the power inverter bridge unit and is used to improve the driving ability of the control signal output by the processor unit. The servo sensor unit adopts an incremental encoder, a resolver sensor, a Tamagawa encoder, a Hall sensor, or a magnetic encoder. The servo sensor unit detects the position of the motor rotor relative to the stator winding for position monitoring. The network interface unit realizes the physical interface of the network layer. The processor unit quickly transmits various motor parameters collected by the motor through the state detection unit and various control parameters of the current processor unit to the Ethernet so that the background management system can use these real-time parameters for data mapping and reconstruction, build a remote virtual image based on digital twin, observe the motor state in real time, and generate high-level control decisions according to the parameters. At the same time, the network interface unit receives control commands from the management layer through the Ethernet in real time and flexibly remotely controls the motor, making a single motor an independent network control node, no longer relying on the on-site whole machine, and having higher flexibility.

[0027] The motor drive device of the present invention realizes the networking of the device through the network interface unit, facilitating network remote control. Through digital twin technology, a virtual image of the motor and even the entire system is built, facilitating the management console to intuitively view the system status and analyze system data, and realizing on-line diagnosis and remote operation and maintenance of the device. The motor control no longer depends on the on-site controller, and the background management system can directly control all the index parameters of the motor node, so as to directly coordinate decisions and realize the coordinated linkage control of multiple on-site devices with physical isolation.

[0028] As Figure 2 shown, it is the working principle diagram of a motor drive method based on EPA and digital twin provided by the present invention. The specific process of the motor drive method based on EPA and digital twin is as follows: The processor unit transmits the relevant parameter information of the motor and the motor controller to the EPA bridge through the network interface unit to achieve high-speed network transmission in the Ethernet. The relevant parameters include all-round parameters of phase current, temperature, voltage and rotor position. The data is transmitted to the Web server side through the EPA agent. The Web server realizes data modeling and reconstruction of the motor and even the entire control system according to the detailed parameters uploaded by the device, builds a virtual device and even a virtual factory, facilitating remote viewing, operation, fault diagnosis and data analysis. At the same time, with the help of the powerful processing and computing power of the background, functions such as data statistics, networked comparative analysis and coordinated linkage control of multiple devices, which are complex and difficult to achieve before, can be realized. Users of the remote workstation can log in to the Web server through permissions from any corner of the world to realize the viewing and control functions of on-site devices.

[0029] The motor drive method of the present invention is directly connected to the Ethernet through the EPA interface, and directly transmits the relevant parameters of the motor driver and the motor to the Ethernet, so as to realize the seamless integration of information based on the Ethernet at all network layers from the management layer, control layer to on-site devices in the intelligent factory or device. Users can directly access and control any motor driver and motor through common tools or software through their access rights anywhere in the world. At the same time, with the help of the high-speed transmission performance of the Ethernet, the data can be transmitted quickly and efficiently. Through the information collection of the motor driver data and combined with digital twin technology, the data is mapped and reconstructed, so as to present the current operating status of the motor driver and the motor in a full-dimensional, real and three-dimensional manner on the management layer interface. Since the motor is the core of the movement of all devices, on this basis, the current status of the entire device can also be deduced according to the status of the motor, so as to realize the digital twin information of the entire system constructed based on the motor drive device of the present invention.

[0030] In this article, specific examples are used to elaborate on the inventive concept in detail. The description of the above embodiments is only for helping to understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, any obvious modifications, equivalent replacements or other improvements made without departing from the inventive concept shall be included within the protection scope of the present invention.

Claims

1. A motor drive device based on EPA and digital twin, characterized in that It includes a power supply module, a status detection unit, a processor unit, a power drive unit, a power inverter bridge unit, a servo sensor unit, and a network interface unit. The power supply module is respectively connected forwardly to the status detection unit, the processor unit, the power drive unit, the power inverter bridge unit, and the network interface unit. The status detection unit is connected forwardly to the processor unit, the power drive unit, and the power inverter bridge unit in sequence. The servo sensor unit is connected forwardly to the processor unit. The network interface unit is connected bidirectionally to the processor unit. When in use, the power inverter bridge unit and the servo sensor are connected to the motor. The power supply module is used to provide energy for other sub-unit circuits. The status detection unit collects various motor parameters and feeds them back to the processor unit. The processor unit generates different PWM waves according to the motor control law to implement the motor control algorithm. The power inverter bridge unit is used to convert direct current to alternating current and directly drive the motor. The power drive unit is arranged between the processor unit and the power inverter bridge unit and is used to improve the driving ability of the control signal output by the processor unit. The servo sensor unit detects the position of the motor rotor relative to the stator winding for position monitoring. The network interface unit implements the physical interface of the network layer. The processor unit quickly transmits various motor parameters collected by the motor through the status detection unit and various control parameters of the current processor unit to the EPA bridge, realizes high-speed network transmission in the Ethernet, builds a remote virtual image based on digital twin, observes the motor status in real time and generates high-level control decisions according to the parameters. At the same time, the network interface unit receives control commands from the management layer through the Ethernet in real time.

2. The motor drive device based on EPA and digital twin according to claim 1, wherein The PWM waves include PWM1H, PWM1L, PWM2H, PWM2L, PWM3H, and PWM3L.

3. The motor drive device based on EPA and digital twin according to claim 2, wherein, The servo sensor unit adopts an incremental encoder, a Tamagawa encoder, a resolver sensor, a Hall sensor, or a magnetic encoder.

4. The motor drive device based on EPA and digital twin according to claim 3, characterized in that, The status detection unit collects the system voltage for overvoltage and undervoltage protection, collects the phase current signal of the motor to implement the FOC algorithm, collects the bus current for overcurrent protection, and collects the temperature signal for overheat protection.

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