Pluggable low-voltage motor intelligent control system

Abstract

The invention relates to the technical field of motor control, in particular to a pluggable low-voltage motor intelligent control system which comprises a motor intelligent control host in communication connection with a motor intelligent control display and a remote intelligent communication operation unit. The motor intelligent control host comprises a mounting bottom plate, a host box is inserted into the mounting bottom plate, and an on-site power cut and transmission unit, a central processing unit and a remote power cut and transmission unit are mounted in the host box; the on-site power cut and transmission unit is used for completing manual power cut and transmission, protection of tripping power cut and remote emergency power cut in a power distribution room; the central processing unit is used for inputting and outputting signals, processing and analyzing data and controlling the motor to start and stop; the remote power-on and power-off unit is used for controlling remote power-on and power- According to the invention, more than 20 kinds of main loops and secondary control electric appliance elements in traditional control can be replaced, a plurality of wires and wiring terminals are not required to be connected, plug-in installation is realized, the use is convenient, and the system is simple, stable and safe.

Description

Technical Field

[0001] This invention relates to the field of motor control technology, and in particular to a pluggable low-voltage motor intelligent control system. Background Technology

[0002] Traditional motor control systems are complex, with high integration density in the distribution cabinet, numerous low-voltage electrical components stacked together, and densely packed secondary wiring. Currently, the more advanced distribution cabinets widely used include GGD distribution cabinets and drawer cabinets (MNS).

[0003] GGD distribution cabinets, depending on the motor power, can accommodate three or even five motor control systems. Each motor control system has its components arranged vertically within the cabinet. The electrical components are arranged first, then the wiring is done. There is no isolation protection between the different motor systems. GGD distribution cabinets require strict adherence to safe spacing between components, meaning they cannot be too densely packed. This reduces the number of motor control systems the cabinet can accommodate, resulting in low utilization. GGD distribution cabinets also demand extremely high wiring standards. Interference exists between the secondary control systems of the motors, making troubleshooting difficult and sometimes leading to simultaneous failures or even complete damage to several systems. Currently, this type of distribution cabinet accounts for more than two-thirds of all distributions.

[0004] Secondly, there's the drawer-style control cabinet (MNS), which divides a distribution cabinet into several drawers (up to nine). The drawer-style cabinet solves the problem of mutual interference between different systems. Each motor control system is housed in a drawer, and drawers for the same model of motor can be interchanged, saving troubleshooting time. The disadvantages are that using drawers adds several mechanical operating mechanisms, increasing the investment for each motor control system by about 1,000 yuan. The number of electrical components in the drawer-style cabinet is not reduced, and the wiring remains complex, requiring integration by a more specialized distribution cabinet manufacturer. During operation, it's impossible to open the drawers to inspect the internal condition. Main circuit connectors sometimes overheat and burn out, and secondary connectors sometimes have poor contact, frequently causing secondary circuit disconnections due to overheating, vibration, etc., resulting in shutdowns. The drawer operating mechanisms are also complex.

[0005] Both types of distribution cabinets currently meet national standards and are the most advanced available. Their common drawback is the excessive number of components and complex wiring. They utilize different hard-wiring methods to control different motors, requiring continuous addition of components to achieve specific functions. There is no universal control system; a single fault in the control loop causes a shutdown, lacking fault warnings and alarms. Troubleshooting relies entirely on manual judgment, which is time-consuming, disrupts normal production, and sometimes even leads to safety accidents. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a plug-in low-voltage motor intelligent control system that can replace more than 20 kinds of secondary control electrical components in traditional control, without the need to connect several wires and terminals, and realizes the functions of various secondary electrical components through software programming. It features plug-in installation, convenient use, simple system, stability, safety and reliability.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a pluggable low-voltage motor intelligent control system, including a motor intelligent control host, wherein the motor intelligent control host is respectively connected to a motor intelligent control display and a remote intelligent communication operation unit. The intelligent motor control host includes a mounting base plate. A set of local power-off and power-on static contacts with A, B, and C three-phase currents are fixedly installed at one end of the mounting base plate, and a set of remote power-off and power-on static contacts with A, B, and C three-phase currents are fixedly installed at the other end of the mounting base plate. A host box is inserted between the local power-off and power-on static contacts and the remote power-off and power-on static contacts. The host box contains a local power-off and power-on unit, a central processing unit, and a remote power-off and power-on unit installed in sequence. The local power outage and restoration unit is used to complete manual power outage and restoration in the power distribution room, protection trip power outage, and remote emergency power outage; The central processing unit is used for inputting and outputting signals, processing and analyzing data, and controlling the start and stop of the motor; it also communicates with the intelligent motor control display and the remote intelligent communication operation unit. The remote power supply / stop unit is used to control the remote power supply to and from the motor.

[0008] As a preferred technical solution, the local power outage and restoration unit includes local power outage and restoration electric contact blades extending from the main unit box. The position and number of the local power outage and restoration electric contact blades are adapted to the local power outage and restoration stationary contact base. A local power outage and restoration operating mechanism is installed inside the main unit box. The local power outage and restoration operating mechanism is connected to a local power outage and restoration electric contact. A local power outage and restoration stationary contact connected to the local power outage and restoration electric contact blade is installed inside the main unit box. A local power outage and restoration handle is installed on the local power outage and restoration operating mechanism. By pushing the local power outage and restoration handle, the connection between the local power outage and restoration electric contact and the local power outage and restoration stationary contact is controlled, thereby realizing the conduction of three-phase current. The local power outage and restoration unit also includes an overload tripping device, a short-circuit tripping device, and a leakage tripping device.

[0009] As a preferred technical solution, the central processing unit includes a power circuit board, a signal input circuit board, a signal output circuit board, a CPU circuit board, and a group of directly connected micro sensors for data acquisition.

[0010] As a preferred technical solution, the function of the power supply circuit board is to convert the AC 220V input to the system into DC 48V and DC 5V; wherein DC 48V provides power to the remote intelligent communication operation unit, and DC 5V provides power to the CPU and internal computing components of the motor intelligent control host.

[0011] As a preferred technical solution, the signal input circuit board is used to receive external digital and analog signals, and the signal output circuit board is used to output digital and analog signals to other devices.

[0012] As a preferred technical solution, the CPU circuit board is used to receive signals from the directly connected micro sensor group, receive input module signals, receive communication information, and communicate with the remote intelligent communication operation unit and the main control room in real time via DCS. It exchanges data and processes it in real time, outputting and displaying the data, and comparing the collected data with the preset threshold of the equipment protection in real time to diagnose the real-time status of the motor, outputting alarm information, outputting trip signals and commands.

[0013] As a preferred technical solution, the directly connected micro-sensor group includes a high-precision current sensor, a high-precision voltage sensor, a high-precision fault grounding sensor, and a temperature sensor.

[0014] As a preferred technical solution, the remote power-off unit includes a remote power-off stationary armature mounted on the main unit box, a remote power-off coil mounted on the stationary armature, and a remote power-off electric armature fixedly mounted on the bottom of the main unit box via a moving armature rebound spring. The stationary armature is in an upright "mountain" shape, and the electric armature is in an inverted "mountain" shape. The height of the electric armature is less than that of the stationary armature. A contact bracket is fixedly mounted above the electric armature, and a remote power-off electric contact is mounted on the contact bracket via a moving contact rebound spring. The two sides of the contact bracket are slidably mounted on the side walls of the main unit box. The remote power-off unit also includes a remote power-off electric contact blade fixedly mounted on the main unit box, which is connected to the stationary contact. When the remote power-off coil is not energized, a certain distance is maintained between the electric armature and the stationary armature. When the remote stop-start coil is energized, the remote stop-start stationary armature generates a magnetic force, which attracts the remote stop-start electric armature. The remote stop-start electric armature drives the remote stop-start electric contact to close with the remote stop-start stationary contact, connecting the three phases A, B, and C of the main circuit and completing the motor start-up. When the remote power-off coil is de-energized, the remote power-off stationary armature is demagnetized, and the remote power-off electric armature is immediately bounced up by the moving armature rebound spring. The remote power-off electric contact separates from the remote power-off stationary contact, and the motor stops running. As a preferred technical solution, the remote intelligent communication operation unit includes an explosion-proof housing. An intelligent control unit, a selector switch, a start button, and a stop button are installed on the explosion-proof housing. The intelligent control unit collects real-time status signals from the start / stop button and the operating position signals from the selector switch, and wirelessly collects the motor's temperature and amplitude signals, transmitting this information to the motor intelligent control host in real time. The remote intelligent communication operation unit displays the motor's operating parameters in real time, including the A, B, and C phase currents, voltages, instantaneous power, and motor temperature. The intelligent control unit is communicatively connected to the motor intelligent control host and can be freely plugged in and unplugged during motor operation without affecting the motor's operation.

[0015] As a preferred technical solution, the intelligent control unit includes an intelligent operating metal housing, inside which a communication CPU circuit board, a motor status indicator light, a digital display screen, and an LED display screen are installed. The lower part of the intelligent operating metal housing is equipped with an internal wiring plug and an external wiring terminal for communicating with the motor intelligent control host.

[0016] As a preferred technical solution, the intelligent motor control display includes a display bottom shell, on which a display top shell is mounted. Inside the display bottom shell, a communication circuit board and a CPU circuit board are installed sequentially from bottom to top. The CPU circuit board is provided with buttons and a digital display screen. A transparent window for the display screen is installed on the digital display screen. Latex button sleeves are installed on the buttons. A through hole for the buttons to pass through is opened on the display top shell. A display screen through hole is also opened on the display top shell.

[0017] As a preferred technical solution, the local power interruption and restoration unit, the remote power interruption and restoration unit, and the central processing unit are sequentially installed inside the main unit, with the remote power interruption and restoration unit located between the local power interruption and restoration unit and the central processing unit.

[0018] The present invention also provides a power distribution cabinet, including a cabinet body, in which multiple motor intelligent control hosts are arranged and installed. A safety isolation plate is installed between adjacent motor intelligent control hosts. A motor intelligent control display is installed on the cabinet door, and the motor intelligent control display corresponds one-to-one with the motor intelligent control host. The motor intelligent control host is connected to a multi-serial communication terminal block, which is connected to a network switch to Ethernet and connected to a DCS host computer via optical fiber. The DCS host computer is located in the main control room.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) The intelligent motor control host of the present invention is a highly integrated hardware component. The control circuit is completed by an embedded central microprocessor and peripheral electronic circuits, replacing more than 20 kinds of secondary control electrical components of traditional control. It does not require connecting several wires and terminals. The present invention realizes the functions of various secondary electrical components through software programming, realizes intelligent monitoring, plug-in installation, convenient use, and the system is simple, stable, safe and reliable.

[0020] (2) The power distribution cabinet provided by the present invention uses communication control operation instead of the original hard wiring connection control; the motor intelligent control host and the motor intelligent control display, the motor intelligent control host and the remote intelligent communication operation unit are all communication operations. All motor intelligent control hosts communicate with the DCS host computer through multiple serial port communication terminals. The secondary control system is communication control, which makes the on-site operation more intuitive. The communication interface can be freely plugged and unplugged while powered on without affecting the motor operation. The system is more reliable, and it is more convenient to collect the parameters of motor temperature and vibration. It also saves a lot of cable investment.

[0021] (3) The intelligent motor control host, intelligent motor control display, and remote intelligent communication operation unit of the present invention each have a central processing unit with self-diagnostic function to ensure that they are functioning correctly and that the system is safe and reliable. Various parameters of the motor are digitally collected and uploaded in real time. The central processing unit of the intelligent motor control host processes, displays, and protects the data in real time, and has functions such as fault warning, tripping, and fault recording.

[0022] (4) The hardware and software of each part of the control system of the motor within a certain power range of the present invention are unified and interchangeable. The power distribution cabinet does not require a professional power distribution cabinet manufacturer to assemble a variety of components in a complicated manner. The hardware and software are universal within a certain specification range. For example, the 10A-100A motor intelligent control host is suitable for controlling all motors from 5.5kw to 45kw. It is only necessary to set the power parameters on the motor nameplate before use.

[0023] (5) The power distribution cabinet of the present invention has only a few motor intelligent control host components arranged neatly, a motor intelligent control display is installed on the cabinet door, the communication line is plug-in type, there is no secondary hard wiring, and a safety isolation plate is set between each motor intelligent control host. It is simple, stable, safe and reliable. The power distribution cabinet does not require assembly by a professional power distribution cabinet manufacturer.

[0024] (6) The central processing unit of the intelligent motor control host of the present invention uses a direct-connected micro sensor group to collect data, without the need for additional massive transmitters.

[0025] (7) The motor intelligent control host and the mounting base plate of the present invention are plug-in type, which makes it easy to replace in time when there is a fault. When repairing the equipment, it is a clear disconnection point, which meets the safety design.

[0026] (8) The present invention satisfies the three-location operation of the motor, namely, manual power supply / discharge in the power distribution room (power distribution cabinet) and real-time intelligent monitoring, intelligent communication operation and real-time intelligent monitoring at the motor side (remote intelligent communication operation unit, less than 500 meters away from the power distribution room), and real-time intelligent monitoring in the main control room and communication with the DCS host computer.

[0027] (9) The local power outage and restoration unit of the present invention further includes an overload tripping device, a leakage tripping device and a short-circuit tripping device; When the equipment load is too high, the three-phase currents of the motor (A, B, and C) gradually increase, and the bimetallic strip of the local power supply unit gradually bends. When the bimetallic strip reaches a certain degree of bending, the overload trip pin on the bimetallic strip will trigger the overload short circuit trip release device to take action, triggering overload tripping. When the equipment leaks current, the high-precision fault grounding sensor inside the motor intelligent control host detects the leakage current. The leakage current setting threshold is typically 30mA, with an action time of less than 0.1 seconds. When the leakage current is greater than or equal to 30mA, the central processing unit sends a stop signal, energizing the leakage trip coil. Within 0.1 seconds, the leakage trip push rod pushes the local trip release device to trip instantaneously, causing a leakage trip. In emergency situations (such as fire), the leakage trip coil can also be remotely activated via the central processing unit for emergency leakage tripping. In cases of severe stalling or line damage during equipment startup, the current can rapidly increase to more than 8 times the rated current or exceed the set instantaneous electromagnetic trip current value within 0.5 seconds. The electromagnetic trip moving armature and electromagnetic trip stationary armature will instantly generate a large magnetism. The electromagnetic trip stationary armature will instantly attract the electromagnetic trip moving armature, which will drive the electromagnetic trip pin, pushing the local trip release device to act, and tripping instantaneously (0.1-0.2 seconds). This is called short circuit tripping. Attached Figure Description

[0028] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein: Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the intelligent motor control host according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the internal structure of the intelligent motor control host according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the remote intelligent communication operation unit according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the internal structure of the local power outage and restoration unit according to Embodiment 1 of the present invention; Figure 6 This is a state diagram of an overload trip in Embodiment 1 of the present invention; Figure 7 This is a state diagram of a short-circuit trip in Embodiment 1 of the present invention; Figure 8 This is a state diagram of leakage tripping in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the internal structure of the remote power outage and restoration unit according to Embodiment 1 of the present invention; Figure 10 This is a schematic diagram of the internal structure of the central processing unit in Embodiment 1 of the present invention; Figure 11 This is a schematic diagram of the internal structure of the power distribution cabinet according to Embodiment 1 of the present invention; Figure 12 This is a diagram illustrating the effect of using Embodiment 1 of the present invention; Figure 13 This is a schematic diagram of the external structure of the power distribution cabinet according to Embodiment 1 of the present invention; Figure 14 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 15 This is an exploded view of the intelligent motor control display according to Embodiment 1 of the present invention; Figure 16 This is a schematic diagram of the internal structure of the remote intelligent communication operation unit according to Embodiment 1 of the present invention; Figure 17 This is a schematic diagram of the internal structure of the intelligent control unit according to Embodiment 1 of the present invention.

[0029] In the diagram: 1-Intelligent motor control host; 11-Mounting base plate; 12-Local power-off stationary contact seat; 13-Remote power-off stationary contact seat; 14-Main unit box; 15-Local power-off unit; 151-Local power-off electric contact knife; 152-Local power-off operating mechanism; 153-Local power-off electric contact; 154-Local power-off stationary contact; 155-Local power-off handle; 156-Overload trip device; 1561-Bimetallic strip; 1562-Overload trip pin; 157-Short circuit trip device; 1571-Electromagnetic trip pin; 1572-Electromagnetic trip moving armature; 1573-Electromagnetic trip stationary armature; 158-Residual current trip device; 1581-Residual current trip push rod; 1582-Residual current trip coil; 159-Local trip release device; 16-Central processing unit; 161-Power supply circuit board; 162-Signal input circuit board; 163-Signal output circuit board; 164-CPU circuit board; 165-Direct connection miniature sensor group; 166-Signal input terminal; 167-Signal output terminal; 168-Current sensor; 169-Residual current sensor; 17- Remote power-off unit; 171-Remote power-off stationary armature; 172-Remote power-off electric armature; 173-Remote power-off coil; 174-Moving armature rebound spring; 175-Remote power-off stationary contact; 176-Remote power-off electric contact; 177-Contact bracket; 178-Remote power-off electric contact blade; 2-Motor intelligent control display; 21-Display bottom shell; 22-Display top shell; 23-Communication circuit board; 24-Display CPU circuit board; 25-Buttons; 26-Digital display screen; 27-Display screen transparent window; 28- 3-Latex button cover; 4-Remote intelligent communication operation unit; 5-Explosion-proof housing; 6-Intelligent control unit; 7-Intelligent operation metal housing; 8-Motor status indicator; 9-Digital display screen; 10-LED display screen; 11-Communication CPU circuit board; 12-Internal wiring plug; 13-External wiring terminal; 14-Changeover switch; 15-Start button; 16-Stop button; 17-Cabinet; 18-Safety isolation plate; 19-Multi-serial port communication terminal; 20-DCS host computer; 21-Main unit communication connection cable. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0031] Example 1: like Figures 1 to 13As shown, the plug-in low-voltage motor intelligent control system includes a motor intelligent control host 1, which is communicatively connected to a motor intelligent control display 2 and a remote intelligent communication operation unit 3. In this embodiment, the motor intelligent control display 2 is installed on the cabinet door, the motor intelligent control host 1 is installed inside the cabinet 4, and the remote intelligent communication operation unit 3 is installed next to the equipment within 500 meters, i.e., next to the motor.

[0032] The intelligent motor control host 1 includes a mounting base plate 11, which is made of insulating material. A set of local power-off and power-on stationary contacts 12 with A, B, and C three-phase currents are fixedly installed at one end of the mounting base plate 11, and a set of remote power-off and power-on stationary contacts 13 with A, B, and C three-phase currents are fixedly installed at the other end of the mounting base plate 11. A host box 14 is inserted between the local power-off and power-on stationary contacts 12 and the remote power-off and power-on stationary contacts 13. The host box 14 contains a local power-off and power-on unit 15, a central processing unit 16, and a remote power-off and power-on unit 17 installed in sequence. In this embodiment, the central processing unit 16 is located between the local power-off and power-on unit 15 and the remote power-off and power-on unit 17. The local power supply / stop unit 15 is used to manually power on / off, perform protective trip power outages, and remote emergency power outages within the power distribution room; the central processing unit 16 is used for inputting and outputting signals, processing and analyzing data, and controlling the motor's start and stop; it communicates with the motor intelligent control display 2 and the remote intelligent communication operation unit 3; the remote power supply / stop unit 17 is used to control the remote power on / off of the motor. When using this invention, simply insert the main unit box 14 into the mounting base plate 11.

[0033] Under normal conditions, the local power-on / off handle 155 can be opened and closed to manually cut off and restore power in the power distribution room, or to remotely (main control or machine side) for emergency tripping. Pushing the local power-on / off handle 155 up to the full position closes the circuit and restores power, while pulling it down to the full position opens the circuit and stops the circuit. After closing the circuit, the motor will not start. At this time, the three-phase power is only supplied to the remote power-on / off stationary contact 175 of the remote power-on / off unit 17. The start button 34 of the remote intelligent communication operation unit 3 needs to be pressed to send a start signal to the central processing unit 16. After the central processing unit 16 determines that the conditions for starting the motor are met, it outputs a closing signal. At this time, the remote power-on / off coil 173 of the remote power-on / off unit 17 is energized and generates magnetic force. The remote power-on / off stationary armature 171 pulls down the remote power-on / off electric armature 172. The remote power-on / off electric armature 172 drives the remote power-on / off electric contact 176 to be firmly attracted to the remote power-on / off stationary contact 175, thus completing the start of the motor. During motor operation, the central processing unit 16 collects various motor parameters in real time and transmits them to the motor intelligent control display 2, the remote intelligent communication operation unit 3, and the DCS host computer 7. Normal motor shutdown requires the remote intelligent communication operation unit 3 or the DCS host computer 7 to send a stop signal to the central processing unit 16. This de-energizes the remote power-on / off coil 173, demagnetizes the remote power-off stationary armature 171, and restores the remote power-off electric armature to its original position. The remote power-off electric contact 176 and the remote power-off stationary contact 175 separate, the main circuit is disconnected, and the motor stops. During motor operation, if the motor intelligent control host 1 detects an abnormality, it will issue an alarm signal and a stop signal as needed.

[0034] like Figures 1 to 3 As shown, the local power interruption unit 15 includes a local power interruption electric contact 151 extending out of the main unit box 14. The position and number of the local power interruption electric contact 151 are adapted to the local power interruption stationary contact base 12. The main unit box 14 is equipped with a local power interruption operation mechanism 152. The local power interruption operation mechanism 152 is connected to a local power interruption electric contact 153. The main unit box 14 is equipped with a local power interruption stationary contact 154 connected to the local power interruption electric contact 151. The local power interruption operation mechanism 152 is equipped with a local power interruption handle 155. By pushing the local power interruption handle 155, the connection between the local power interruption electric contact 153 and the local power interruption stationary contact 154 is controlled, thereby realizing the conduction of three-phase current. like Figure 3As shown, the local power supply interruption unit 15 also includes an overload tripping device 156, a short-circuit tripping device 157, and a leakage current tripping device 158. The overload tripping device 156 is suitable for situations where the equipment load is too high, causing the A, B, and C phase currents of the motor to gradually increase. The bimetallic strip 1561 of the local power supply interruption unit 15 gradually bends. When the bimetallic strip 1561 reaches a certain degree of bending, the overload tripping pin 1562 on the bimetallic strip 1561 triggers the local tripping trip unit 159 to operate, thus triggering the overload trip. When the equipment leaks current, the high-precision fault grounding sensor inside the motor intelligent control host 1 detects the leakage current. The leakage current setting threshold is generally 30mA, and the action time is less than 0.1 seconds. When the leakage current is greater than or equal to 30mA, the central processing unit 16 sends a stop signal, the leakage current trip coil 1582 is energized, and within 0.1s the leakage current trip push rod 1581 pushes the local trip release device 159 to act instantaneously, causing leakage current tripping. In emergency situations (such as fire), the leakage current trip coil 1582 can be remotely activated via the central processing unit 16 to achieve remote emergency leakage current tripping. In cases of severe stalling or line damage during equipment startup, the current will rapidly increase to more than 8 times the rated current or exceed the set instantaneous electromagnetic trip current value within 0.5 seconds. The electromagnetic trip moving armature 1572 and the electromagnetic trip stationary armature 1573 will instantly generate a large magnetism. The electromagnetic trip stationary armature 1573 will instantly attract the electromagnetic trip moving armature 1572. The electromagnetic trip moving armature 1572 will drive the electromagnetic trip striker 1571, which will push the local trip release device 159 to act, tripping instantly (0.1-0.2 seconds). This is called short circuit tripping.

[0035] like Figure 10 As shown, the central processing unit 16 includes a power supply circuit board 161, a signal input circuit board 162, a signal output circuit board 163, a CPU circuit board 164, and a direct-connected miniature sensor group 165 for data acquisition. The function of the power supply circuit board 161 is to convert the AC 220V input to the system into DC 48V and DC 5V; the DC 48V provides power to the remote intelligent communication operation unit 3, and the DC 5V provides power to the CPU and internal computing components of the motor intelligent control host 1.

[0036] The signal input circuit board 162 is used to receive external digital and analog signals, and the signal output circuit board 163 is used to output digital and analog signals to other devices.

[0037] like Figure 10As shown, the CPU circuit board 164 receives signals from the directly connected miniature sensor group 165, receives input module signals, receives communication information, and communicates with the remote intelligent communication operation unit 3 and the main control room in real time via DCS. It exchanges and processes data in real time, displaying the outputs and comparing the collected data with preset thresholds for equipment protection to diagnose the motor's real-time status, outputting alarm information, trip signals, and commands. The directly connected miniature sensor group 165 includes a high-precision current sensor 168, a high-precision voltage sensor, a high-precision fault grounding sensor, and a temperature sensor.

[0038] Among them, the high-precision current sensor 168 is nested on the three-phase bus, outputting a millivolt signal. The three-phase currents A, B, and C simultaneously pass through the leakage current sensor 169 to detect the zero-sequence current. The voltage sensor is connected in parallel to the A / B / C / N lines to form a millivolt signal → opto-isolation → 0-5V DC signal → CPU processor. The CPU processor is located on the CPU circuit board 164. The accuracy of the sensors determines the accuracy and precision of the CPU's display, control, and protection. The CPU processor has 12 preset motor start modes and more than 20 preset protection modes. The parameters of the motor intelligent control host 1 can be uploaded to the DCS host computer 7 system through a network switch and communication software package to convert the communication protocol. The network switch is a multi-serial communication terminal block 6. Each multi-serial communication terminal block 6 has 16 serial ports and two Ethernet communication ports. Each serial port can support 16 (theoretically 32) motor intelligent control hosts 1 connected in parallel. Thus, 2-3 multi-serial communication terminal blocks 6 can connect all the motor intelligent control hosts 1 in the entire power distribution room, enabling the exchange of information between all motor intelligent control hosts 1 and the DCS host computer 7. The multi-serial communication terminal block 6 and the motor intelligent control host 1 communicate using a serial communication protocol. The industrial Ethernet port of the multi-serial communication terminal block 6 connects to an industrial control computer or the factory's DCS host computer 7 system (distributed control system), enabling real-time monitoring in the main control room and uploading data to the factory's MES (Production Information Management System) system. This improves production efficiency, reduces energy consumption, facilitates data analysis, saves energy, and optimizes production. Only the current sensor 168 and leakage current sensor 169 are shown in the figure; other sensors can also be installed, all within the scope of this invention.

[0039] like Figures 1 to 3 ,、 Figure 9As shown, the remote power-off unit 17 includes a remote power-off stationary armature 171 mounted on the main unit box 14. A remote power-off coil 173 is mounted on the remote power-off stationary armature 171. A remote power-off electric armature 172 is fixedly mounted on the bottom of the main unit box 14 via a moving armature rebound spring 174. The remote power-off stationary armature 171 is in an upright "mountain" shape, while the remote power-off electric armature 172 is in an inverted "mountain" shape. The height of the remote power-off electric armature 172 is less than that of the remote power-off stationary armature 171. The two are installed opposite each other. A contact bracket 177 is fixedly mounted on the top of the remote power-off electric armature 172. The three contact brackets 177 are respectively used for... For the installation of three-phase current, a remote stop and start electric contact 176 is mounted on the contact bracket 177 via a moving contact rebound spring. The two sides of the contact bracket 177 are slidably mounted on the side wall of the main unit box 14. The two sides of the contact bracket 177 are provided with longitudinal slide bars, and the inner wall of the main unit box 14 is provided with corresponding longitudinal slide grooves. The remote stop and start unit 17 also includes a remote stop and start electric contact knife 178 fixedly mounted on the main unit box 14. The remote stop and start electric contact knife 178 is connected to a remote stop and start stationary contact 175. When the remote stop and start coil 173 is not energized, a certain distance is maintained between the remote stop and start electric armature 172 and the remote stop and start stationary armature 171. When the remote stop and start coil 173 is energized, the remote stop and start stationary armature 171 generates a magnetic force, which attracts the remote stop and start electric armature 172 down. The remote stop and start electric armature 172 drives the remote stop and start electric contact 176 to close with the remote stop and start stationary contact 175, and the three phases of the main circuit A, B and C are connected, completing the motor start. When the remote stop-start coil 173 is de-energized, the remote stop-start stationary armature 171 is demagnetized, and the remote stop-start electric armature 172 is immediately pushed up by the passive armature rebound spring 174. The remote stop-start electric contact 176 separates from the remote stop-start stationary contact 175, and the motor stops running.

[0040] The energization and de-energization of the remote stop-start coil 173 determine the start and stop of the motor. The energization / de-energization commands of the remote stop-start coil 173 are all from the signal output terminal 167 of the central processing unit 16, and the signal input terminal 166 is used to input signals. At the same time, the engagement status, current, voltage, temperature, and auxiliary contact signals of the remote stop-start coil 173, the remote stop-start electric armature 172, and the remote stop-start stationary armature 171 are all fed back to the central processing unit 16, thus forming a closed loop.

[0041] like Figure 4As shown, the remote intelligent communication operation unit 3 includes an explosion-proof housing 31. An intelligent control unit 32, a changeover switch 33, a start button 34, and a stop button 35 are installed on the explosion-proof housing 31. The intelligent control unit 32 collects real-time status signals from the start / stop button and the operation position signals from the changeover switch 33, and wirelessly collects the motor's temperature and amplitude signals, transmitting this information to the motor intelligent control host 1 in real-time. The remote intelligent communication operation unit 3 displays the motor's operating parameters in real-time, including the A, B, and C phase currents, voltages, instantaneous power, and motor temperature. The intelligent control unit 32 is connected to the motor intelligent control host 1 via communication; it can be freely plugged in and unplugged during motor operation without affecting the motor's operation.

[0042] like Figure 16 and Figure 17 As shown, the intelligent control unit 32 includes an intelligent operating metal housing 321. The intelligent operating metal housing 321 houses a communication CPU circuit board 325, a motor status indicator light 322, a digital display screen 323, and an LED display screen 324. The lower part of the intelligent operating metal housing 321 is equipped with an internal wiring plug 326 and an external wiring terminal 327 for communicating with the motor intelligent control host 1.

[0043] The key difference between the remote intelligent communication operation unit 3 and the traditional operation column lies in the fact that the start button 34, stop button 35, and changeover switch 33, among other electrical components, are no longer directly wired to the motor intelligent control host 1, as is the case with traditional operation columns. The motor intelligent control host 1 only provides the remote intelligent communication operation unit 3 with a DC 48V power supply. The central processing unit 16 of the motor intelligent control host 1 communicates with the remote intelligent communication operation unit 3. The start button 34, stop button 35, and changeover switch 33 of the remote intelligent communication operation unit 3 input DC 5V digital switch signals to the intelligent control unit 32. The intelligent control unit 32 then transmits these signals to the central processing unit 16 of the motor intelligent control host 1. Data such as the motor stator temperature, the bearing temperatures at both ends, and the amplitude of the large motor, collected by the motor's internal wireless sensors, are first transmitted to the intelligent control unit 32, and then to the central processing unit 16 of the motor intelligent control host 1. The intelligent control unit 32 exchanges data with the central processing unit 16 of the motor intelligent control host 1 in real time and updates synchronously. Parameters such as the motor's A, B, and C phase currents, A, B, and C phase voltages, instantaneous power, stator temperature, bearing temperatures at both ends, and amplitude of the large motor are accurately and cyclically displayed on the remote intelligent communication operation unit 3. The remote intelligent communication operation unit 3 collects changes from the on-site start button 34, stop button 35, and changeover switch 33 in real time and transmits this data to the central processing unit 16 of the motor intelligent control host 1 in the power distribution room. The central processing unit 16 analyzes and outputs start or stop commands. When there is a temporary communication failure between the remote intelligent communication operation unit 3 and the central processing unit 16 of the motor intelligent control host 1 in the power distribution room, the motor intelligent control host 1 defaults to the initial state. Therefore, the communication plug of the intelligent control unit 32 can be freely plugged and unplugged while the motor is running without affecting the motor stopping. The intelligent control unit 32 is connected to the central processing unit 16 of the intelligent control host 1 for the motor in the power distribution room via communication. The intelligent control host 1 for the motor in the power distribution room only provides the intelligent control unit 32 with DC 48V power. The communication line is a 0.5 square millimeter core twisted pair cable. The connection between the intelligent control unit 32 and the intelligent control host 1 for the motor in the power distribution room uses a 4-core double shielded computer cable, while the traditional connection line is generally 10-14 cores, which greatly reduces cable investment.

[0044] The position signals from the start button 34, stop button 35, and selector switch 33 are first acquired by the communication CPU circuit board 325. After data processing, the data is transmitted to the central processing unit 16 of the motor intelligent control host 1 in the power distribution room. After judgment and analysis, the central processing unit 16 outputs a start or stop command. Some parameters of the motor intelligent control host 1, i.e., parameters related to on-site operation, are transmitted to the intelligent control unit 32 for real-time display. The digital display screen 323 displays in Chinese. Through the explosion-proof observation hole, all current parameters of the motor can be intuitively understood, including the motor's A, B, and C phase currents, A, B, and C phase voltages, instantaneous power, stator temperature, bearing temperatures at both ends, and amplitude of large motors, etc., which are accurately and cyclically displayed. This saves the need for ammeters, voltmeters, wattmeters, indicator lights, temperature displays, etc. The LED display screen 324 is designed for better observation of important parameters of the motor intelligent control host 1 from a distance. The internal wiring plug 326 is the signal connection between the intelligent control unit 32 and the start button 34, stop button 35, and selector switch 33, with a voltage of DC 5V. External terminal 327 is the power and communication terminal for the intelligent control unit 32 and the central processing unit 16 of the motor intelligent control host 1 in the power distribution room. It can be freely plugged in and unplugged without affecting the operation of the motor.

[0045] like Figure 15 As shown, the motor intelligent control display 2 includes a display bottom shell 21, a display top shell 22 mounted on the display bottom shell 21, and a communication circuit board 23 and a CPU circuit board 24 installed sequentially from bottom to top inside the display bottom shell 21. The CPU circuit board 24 is provided with buttons 25 and a digital display screen 26. The digital display screen 26 is provided with a transparent window 27. The buttons 25 are provided with latex button sleeves 28. The display top shell 22 has a through hole for the buttons 25 to pass through, and the display top shell 22 also has a display screen through hole.

[0046] The CPU circuit board 24 has a digital display screen 26, four system status indicator lights, and five system parameter modification buttons 25. The communication circuit board 23 has a nine-pin communication connector, which connects to the motor intelligent control host 1 via a 1.5-5 meter long pre-made nine-pin serial cable. The motor intelligent control host 1 provides DC 5V power to the motor intelligent control display 2 via the nine-pin serial cable, eliminating the need for a power converter board and simplifying the display hardware. After communication between the motor intelligent control display 2 and the motor intelligent control host 1, data from the motor intelligent control host 1 is transmitted to the motor intelligent control display 2 in real time. The digital display screen 26 displays all current parameters of the motor, including the A, B, and C phase currents. The system accurately and cyclically displays parameters such as A, B, and C phase voltages, instantaneous power, motor stator temperature, bearing temperatures at both ends, and amplitude of the large motor. It also displays information about the motor intelligent control host 1 itself, such as control mode and communication status. The buttons 25 on the CPU circuit board 24 allow modification of system parameters in the CPU of the motor intelligent control display 2, followed by confirmation via button 25. The modified data is then transmitted to the central processing unit 16 of the motor intelligent control host 1, allowing modification of operating permissions, motor control modes, protection modes, protection thresholds, fault record queries, and fault resets. The buttons 25 on the CPU circuit board 24 also allow for programming of the input and output terminals of the central processing unit 16. The sensor range can be modified, and various simulation tests can be performed on the system before commissioning, such as external simulated current and voltage tests, leakage tests, remote power-on / off switching under no-load conditions, and forced local power-off / off unit 15 emergency tripping. The motor intelligent control display 2 is freely pluggable and unpluggable without affecting motor operation.

[0047] The present invention also provides a power distribution cabinet, such as Figures 11 to 13 As shown, the system includes a cabinet 4, preferably a rectangular cabinet 4. Multiple intelligent motor control hosts 1 are arranged and installed inside the cabinet 4; in this embodiment, six are installed. Safety isolation plates 5, which are insulating plates, are installed between adjacent intelligent motor control hosts 1. Intelligent motor control displays 2 are installed on the cabinet doors of the cabinet 4 to allow observation of the operation even when the doors are closed. Each intelligent motor control display 2 corresponds one-to-one with an intelligent motor control host 1; therefore, six intelligent motor control displays 2 are installed in this embodiment. Figure 12 The diagram shown illustrates the effect of using this invention. Multiple intelligent motor control hosts 1 are connected to each other via host communication connection lines 8. Each intelligent motor control host 1 is connected to a multi-serial communication terminal block 6. The multi-serial communication terminal block 6 is connected to a network switch and converted to Ethernet. A DCS host computer 7 is connected via optical fiber and is located in the main control room.

[0048] The present invention has the following advantages: (1) The motor intelligent control host 1 of the present invention is a highly integrated hardware component. The control circuit is completed by an embedded central microprocessor and peripheral electronic circuits, replacing more than 20 kinds of secondary control electrical components of traditional control. There is no need to connect several wires and terminals. The present invention realizes the functions of various secondary electrical components through software programming, realizes intelligent monitoring, plug-in installation, convenient use, and the system is simple, stable, safe and reliable.

[0049] (2) The power distribution cabinet provided by the present invention adopts communication control operation instead of the original hard wiring connection control; the motor intelligent control host 1 and the motor intelligent control display 2, and the motor intelligent control host 1 and the remote intelligent communication operation unit 3 are all communication operations. All motor intelligent control hosts 1 communicate with the DCS host computer 7 through the multi-serial port communication terminal 6. The secondary control system is communication control, which makes the on-site operation more intuitive. The communication interface can be freely plugged and unplugged while powered on, without affecting the motor operation. The system is more reliable, and it is more convenient to collect the parameters of motor temperature and vibration, and saves a lot of cable investment.

[0050] (3) Each of the intelligent motor control host 1, intelligent motor control display 2, and remote intelligent communication operation unit 3 of the present invention has a central processing unit with self-diagnostic function to ensure that it is free from problems and that the system is safe and reliable. Various parameters of the motor are digitally collected and uploaded in real time. The central processing unit 16 of the intelligent motor control host 1 processes, displays and protects the data in real time, and has functions such as fault warning, tripping, and fault recording.

[0051] (4) The hardware and software of each part of the control system of the motor within a certain power range of the present invention are unified and interchangeable. The power distribution cabinet does not require a professional power distribution cabinet manufacturer to assemble a variety of components in a complicated manner. The hardware and software are universal within a certain specification range. For example, the 10A-100A motor intelligent control host 1 is suitable for controlling all motors from 5.5kw to 45kw. It is only necessary to set the power parameters on the motor nameplate before use.

[0052] (5) The power distribution cabinet of the present invention has only a few motor intelligent control host 1 components arranged neatly, a motor intelligent control display 2 installed on the cabinet door, and a plug-in communication cable without secondary hard wiring. A safety isolation plate 5 is provided between each motor intelligent control host 1. It is simple, stable, safe and reliable. The power distribution cabinet does not require assembly by a professional power distribution cabinet manufacturer.

[0053] (6) The central processing unit 16 of the intelligent motor control host 1 of the present invention uses the direct connection micro sensor group 165 to collect data, without the need for external addition of a large number of transmitters.

[0054] (7) The motor intelligent control host 1 and the mounting base plate 11 of the present invention are plug-in type, which makes it easy to replace in time when there is a fault. When repairing the equipment, it is a clear disconnection point, which meets the safety design.

[0055] (8) The present invention satisfies the three-location operation of the motor, namely, manual power supply / discharge in the power distribution room (power distribution cabinet) and real-time intelligent monitoring, intelligent communication operation and real-time intelligent monitoring at the motor side (remote intelligent communication operation unit 3, less than 500 meters away from the power distribution room), and real-time intelligent monitoring in the main control room and DCS host computer 7.

[0056] (9) The local power supply unit 15 of the present invention also includes an overload tripping device 156, a leakage tripping device 158, and a short-circuit tripping device 157. When the equipment load is too large, the A, B, and C phase currents of the motor gradually increase, and the bimetallic strip 1561 of the local power supply unit gradually bends. When the bimetallic strip 1561 reaches a certain degree of bending, the overload tripping pin 1562 on the bimetallic strip 1561 will trigger the overload short-circuit tripping device to operate, triggering overload tripping. When the equipment leaks current, the high-precision fault grounding sensor inside the motor intelligent control host 1 detects the leakage current. The leakage current setting threshold operating current is generally 30mA, and the operating time is less than 0.1 seconds. When the leakage current is greater than or equal to 30mA, the central processing unit 16 sends a stop signal, the leakage tripping coil 1582 is energized, and within 0.1s, the leakage tripping push rod 1581 pushes the leakage tripping device to operate instantaneously, causing leakage tripping. In emergency situations (such as fire), the leakage current trip coil 1582 can be remotely activated via the central processing unit 16 to achieve remote emergency leakage current tripping. In cases of severe stalling or line damage during equipment startup, the current will rapidly increase to more than 8 times the rated current or exceed the set instantaneous electromagnetic trip current value within 0.5 seconds. The electromagnetic trip moving armature 1572 and the electromagnetic trip stationary armature 1573 will instantly generate a large magnetism. The electromagnetic trip stationary armature 1573 will instantly attract the electromagnetic trip moving armature 1572. The electromagnetic trip moving armature 1572 will drive the electromagnetic trip striker 1571, which will push the electromagnetic trip trip device to act, tripping instantly (0.1-0.2 seconds). This is called short circuit tripping.

[0057] Example 2: like Figure 14 As shown, the technical solution of this embodiment is basically the same as that of Embodiment 1, except that: a local power interruption unit 15, a remote power interruption unit 17, and a central processing unit 16 are sequentially installed inside the main unit box 14, with the remote power interruption unit 17 located between the local power interruption unit 15 and the central processing unit 16. This embodiment interchanges the positions of the central processing unit 16 and the remote power interruption unit 17, placing the remote power interruption unit 17 in the middle. Its structure is also very compact; the structural details are not elaborated here and are within the scope of protection of this invention.

[0058] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pluggable low-voltage motor intelligent control system, characterized in that: It includes a motor intelligent control host (1), which is connected to a motor intelligent control display (2) and a remote intelligent communication operation unit (3). The motor intelligent control host (1) includes a mounting base plate (11). A set of local power-off and power-on static contacts (12) with three-phase current of A, B, and C is fixedly installed at one end of the mounting base plate (11). A set of remote power-off and power-on static contacts (13) with three-phase current of A, B, and C is fixedly installed at the other end of the mounting base plate (11). A host box (14) is inserted between the local power-off and power-on static contacts (12) and the remote power-off and power-on static contacts (13). The host box (14) contains a local power-off and power-on unit (15), a central processing unit (16), and a remote power-off and power-on unit (17) installed in sequence. The local power outage and restoration unit (15) is used to complete manual power outage and restoration, protection trip power outage, and remote emergency power outage in the power distribution room; The central processing unit (16) is used for inputting and outputting signals, processing and analyzing data, and controlling the start and stop of the motor; it communicates with the motor intelligent control display (2) and the remote intelligent communication operation unit (3); The remote power supply / stop unit (17) is used to control the remote power supply to and from the motor.

2. The plug-in low-voltage motor intelligent control system as described in claim 1, characterized in that: The local power supply and cutoff unit (15) includes a local power supply and cutoff electric contact (151) extending from the main unit box (14). The position and number of the local power supply and cutoff electric contact (151) are adapted to the local power supply and cutoff stationary contact base (12). The main unit box (14) is equipped with a local power supply and cutoff operating mechanism (152). The local power supply and cutoff operating mechanism (152) is connected to a local power supply and cutoff electric contact (153). The main unit box (14) is equipped with a local power supply and cutoff stationary contact (154) connected to the local power supply and cutoff electric contact (151). The local power supply and cutoff operating mechanism (152) is equipped with a local power supply and cutoff handle (155). By pushing the local power supply and cutoff handle (155), the connection between the local power supply and cutoff electric contact (153) and the local power supply and cutoff stationary contact (154) is controlled, thereby realizing the conduction of three-phase current. The local power outage and restoration unit (15) also includes an overload tripping device (156), a leakage tripping device (158), and a short-circuit tripping device (157).

3. The plug-in low-voltage motor intelligent control system as described in claim 1, characterized in that: The central processing unit (16) includes a power circuit board (161), a signal input circuit board (162), a signal output circuit board (163), a CPU circuit board (164), and a direct-connected micro-sensor group (165) for data acquisition.

4. The plug-in low-voltage motor intelligent control system as described in claim 3, characterized in that: The function of the power circuit board (161) is to convert the AC 220V connected to the system into DC48V and DC5V; DC48V provides power to the remote intelligent communication operation unit (3), and DC5V provides power to the CPU and internal computing components of the motor intelligent control host (1).

5. The plug-in low-voltage motor intelligent control system as described in claim 3, characterized in that: The signal input circuit board (162) is used to receive external digital and analog signals, and the signal output circuit board (163) is used to output digital and analog signals to other devices.

6. The plug-in low-voltage motor intelligent control system as described in claim 3, characterized in that: The CPU circuit board (164) is used to receive signals from the direct-connected micro sensor group (165), receive input module signals, receive communication information, and communicate with the remote intelligent communication operation unit (3) and the main control room in real time via DCS. It exchanges data and processes it in real time. On the one hand, it outputs and displays the data, and on the other hand, it compares the collected data with the preset threshold of the equipment protection in real time to diagnose the real-time status of the motor, and outputs alarm information, trip signals and commands.

7. The plug-in low-voltage motor intelligent control system as described in claim 3, characterized in that: The direct-connected micro-sensor group (165) includes a high-precision current sensor (168), a high-precision voltage sensor, a high-precision fault grounding sensor, and a temperature sensor.

8. The plug-in low-voltage motor intelligent control system as described in claim 1, characterized in that: The remote power-off unit (17) includes a remote power-off stationary armature (171) mounted on the main unit box (14). A remote power-off coil (173) is mounted on the remote power-off stationary armature (171). A remote power-off electric armature (172) is fixedly mounted on the bottom of the main unit box (14) by a moving armature rebound spring (174). The remote power-off stationary armature (171) is in the shape of an upright "mountain", and the remote power-off electric armature (172) is in the shape of an inverted "mountain". The height of the remote power-off electric armature (172) is less than that of the remote power-off stationary armature (171). The top of the remote power-off electric armature (172) is fixed. The contact bracket (177) is installed, and a remote stop-start electric contact (176) is installed on the contact bracket (177) via a moving contact rebound spring. The two sides of the contact bracket (177) are slidably installed on the side wall of the main unit box (14). The remote stop-start unit (17) also includes a remote stop-start electric contact knife (178) fixedly installed on the main unit box (14). The remote stop-start electric contact knife (178) is connected to a remote stop-start stationary contact (175). When the remote stop-start coil (173) is not energized, a certain distance is maintained between the remote stop-start electric armature (172) and the remote stop-start stationary armature (171). When the remote power-on / off coil (173) is energized, the remote power-off stationary armature (171) generates a magnetic force, which attracts the remote power-off electric armature (172). The remote power-off electric armature (172) drives the remote power-off electric contact (176) to close with the remote power-off stationary contact (175), and the three phases of the main circuit A, B, and C are connected, completing the motor start-up. When the remote power-off coil (173) is de-energized, the remote power-off stationary armature (171) is demagnetized, the remote power-off electric armature (172) is immediately bounced up by the moving armature rebound spring (174), the remote power-off electric contact (176) separates from the remote power-off stationary contact (175), and the motor stops running.

9. The plug-in low-voltage motor intelligent control system as described in claim 1, characterized in that: The remote intelligent communication operation unit (3) includes an explosion-proof housing (31). The explosion-proof housing (31) is equipped with an intelligent control unit (32), a changeover switch (33), a start button (34), and a stop button (35). The intelligent control unit (32) collects the status signal of the start / stop button and the operation position signal of the changeover switch (33) in real time, and wirelessly collects the temperature and amplitude signals of the motor, and transmits this information to the motor intelligent control host (1) in real time. The remote intelligent communication operation unit (3) displays the motor's operating parameters in real time, including the three-phase current, voltage, instantaneous power, and temperature of the motor in A, B, and C phases. The intelligent control unit (32) is connected to the motor intelligent control host (1) for communication. The unit can be freely plugged in and unplugged when the motor is running without affecting the operation of the motor.

10. The pluggable low-voltage motor intelligent control system as described in claim 9, characterized in that: The intelligent control unit (32) includes an intelligent operating metal housing (321), which houses a communication CPU circuit board (325), a motor status indicator (322), a digital display screen (323), and an LED display screen (324). The lower part of the intelligent operating metal housing (321) is equipped with an internal wiring plug (326) and an external wiring terminal (327) for communicating with the intelligent motor control host (1).

11. The pluggable low-voltage motor intelligent control system as described in claim 1, characterized in that: The motor intelligent control display (2) includes a display bottom shell (21), a display top shell (22) is installed on the display bottom shell (21), a communication circuit board (23) and a CPU circuit board (24) are installed inside the display bottom shell (21) from bottom to top, a button (25) and a digital display screen (26) are provided on the CPU circuit board (24), a transparent window (27) of the display screen is installed on the digital display screen (26), a latex button sleeve (28) is installed on the button (25), a through hole is opened on the display top shell (22) for the button (25) to pass through, and a display screen through hole is also opened on the display top shell (22).

12. The plug-in low-voltage motor intelligent control system as described in claim 1, characterized in that: The local power supply unit (15), the remote power supply unit (17), and the central processing unit (16) are installed sequentially inside the main unit box (14). The remote power supply unit (17) is located between the local power supply unit (15) and the central processing unit (16).

13. A power distribution cabinet, characterized in that: The system includes a cabinet (4), in which multiple motor intelligent control hosts (1) as described in any one of claims 1 to 12 are arranged and installed. A safety isolation plate (5) is installed between adjacent motor intelligent control hosts (1). The motor intelligent control display (2) is installed on the cabinet door of the cabinet (4). The motor intelligent control display (2) corresponds one-to-one with the motor intelligent control host (1). The motor intelligent control host (1) is connected to a multi-serial communication terminal block (6). The multi-serial communication terminal block (6) is connected to a network switch to Ethernet and is connected to a DCS host computer (7) through an optical cable. The DCS host computer (7) is located in the main control room.

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