CN112165222A - Control device based on excitation system of Internet of things - Google Patents
Control device based on excitation system of Internet of things Download PDFInfo
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- CN112165222A CN112165222A CN202011229079.7A CN202011229079A CN112165222A CN 112165222 A CN112165222 A CN 112165222A CN 202011229079 A CN202011229079 A CN 202011229079A CN 112165222 A CN112165222 A CN 112165222A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/32—Arrangements for controlling wound field motors, e.g. motors with exciter coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Computing Systems (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a control device based on an Internet of things excitation system, which comprises an excitation ring and a control system, wherein a concentric groove is formed in the excitation ring, a limiting ring is fixedly connected to the inner wall of the excitation ring, a clamping groove is formed in the inner wall of the excitation ring, a plurality of convex blocks are arranged at the bottom of the excitation ring, a plurality of sliding blocks are connected in the clamping groove in a sliding mode, each sliding block is fixedly connected with a movable block, a plastic rod is fixedly connected to each movable block, and the excitation block is sleeved on each plastic rod in a sliding mode. Has the advantages that: when the position of the excitation block needs to be adjusted, the multifunctional gateway can control an external air pump to pump air to the inner pipe, so that the external air pump pushes the magnetic piston to move in the inner pipe, the magnetic piston drives the magnetic slide block in the excitation block to move through magnetic attraction, and the excitation block is driven to move, so that the purpose of changing the position of the excitation block is achieved.
Description
Technical Field
The invention relates to the technical field of application of the Internet of things, in particular to a control device based on an excitation system of the Internet of things.
Background
The internet of things is a device and technology for various information sensors, radio frequency identification technologies, global positioning systems, infrared sensors, laser scanners and the like, collects any object or process needing monitoring, connection and interaction in real time, collects various required information of sound, light, heat, electricity, mechanics, chemistry, biology, position and the like, realizes ubiquitous connection of objects and objects, and objects and people through various possible network accesses, and realizes intelligent sensing, identification and management of the objects and the process.
The internet of things is an information carrier based on the internet, a traditional telecommunication network and the like, and the industrial application of the network synchronous motor which enables all common physical objects capable of being independently addressed to form interconnection and intercommunication is very wide, while an excitation power supply is a core component for driving the synchronous motor to normally operate.
In the prior art, under different running states of the motor, an excitation system needs to accurately output proper excitation current so as to keep the normal running of the synchronous motor. For an excitation power supply product, through decades of development, a main circuit structure of the excitation power supply product is relatively mature, the improvement space is not large, and the development direction of the product is intelligentization and informatization at present. However, with the continuous progress of the internet of things technology, the existing excitation system of the motor is not well applied to the internet of things technology, the latest hardware technology and the advanced control algorithm are not rapidly integrated into the product, and the development trend of the intelligent and information era is kept up.
For a synchronous motor, under different running states of starting, undervoltage, underexcitation, overexcitation, step loss, resynchronization, shutdown and the like, different working modes of excitation system such as no excitation, full excitation, forced excitation, field suppression, inverter feed and the like are required. And aiming at different industrial requirements, the excitation system also needs to operate under different control modes such as constant voltage, constant current, constant power factor, constant reactive power and the like. Therefore, it is necessary to intelligently switch the control mode of the excitation power supply according to the operating characteristics of the motor and the operating state of the excitation system, and reasonably allocate the control parameters of the system, so as to finally realize the intelligent control of the excitation system.
Disclosure of Invention
The invention aims to solve the problem that an excitation system of a motor in the prior art does not well apply the technology of the Internet of things, so that the motor has poor rotation speed and accuracy in different running states such as starting, undervoltage, underexcitation, overexcitation, step loss, resynchronization and shutdown.
In order to achieve the purpose, the invention adopts the following technical scheme: the control device based on the IOT excitation system comprises an excitation ring and a control system, wherein a concentric groove is formed in the excitation ring, the inner wall of the excitation ring is fixedly connected with a limiting ring, a clamping groove is formed in the inner wall of the excitation ring, a plurality of convex blocks are arranged at the bottom of the excitation ring, a plurality of sliding blocks are connected in the clamping groove in a sliding mode, each sliding block is fixedly connected with a movable block, a plastic rod is fixedly connected to each movable block, and the excitation block is sleeved on each plastic rod in a sliding mode;
the lug is made of soft rubber, electrorheological fluid is filled in the lug, and two electrodes are arranged in the lug.
In the control device based on the excitation system of the internet of things, the control system comprises a sensing network and a processing platform of the internet of things; the sensing network comprises a transmitter, a controller and multifunctional gateway equipment, the transmitter and at least one controller are mutually associated, the transmitter acquires original data, packages the acquired original data and equipment information arranged in the transmitter into a data packet and then sends the data packet to the controller, and the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the processing unit preprocesses the received data packet, stores the preprocessed data in the data storage unit and/or judges whether the preprocessed data meet preset conditions, if so, the addition of data nodes and the display of a configuration picture are completed on the configuration unit according to a pre-established configuration picture model;
the transmitter comprises a search unit; the transmitting of the encapsulated data packet to the controller by the transmitter specifically comprises: when the association state of the transmitter and at least one controller is normal, the transmitter sends the packaged data packet to the controller associated with the transmitter; when the correlation state of the transmitter and at least one controller is abnormal, the searching unit searches at least one controller which is close to the transmitter and reliable in strength according to the strength of the current signal and sends the data packet.
In the control device based on the excitation system of the internet of things, the controller comprises a judging unit, a sending unit and a selecting unit; the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the method specifically comprises the following steps: when the judging unit judges that the controller is in a normal excitation state, the sending unit directly transmits the received data packet to the multifunctional gateway equipment and transmits the data packet to the Internet of things processing platform through the multifunctional gateway equipment; when the judging unit judges that the controller is in an undervoltage state, an underexcitation state or an overexcitation state, the selecting unit selects at least one controller which is close to and can be normally used to indirectly transmit the received data packet to the multifunctional gateway equipment through the sending unit and transmit the data packet to the excitation block through the multifunctional gateway equipment.
In the control device based on the excitation system of the internet of things, the controller further comprises a storage unit; when the controller is in an undervoltage state, an underexcitation state and an overexcitation state, the storage unit caches the received data packet locally, and when excitation is recovered to be normal, historical data are supplemented in the multifunctional gateway equipment through the data time tag.
In the control device based on the excitation system of the internet of things, the management control system of the internet of things comprises at least one control terminal, information set in the transmitter is modified or set through the control terminal by utilizing infrared, WIA-PA or RFID technology, and the information is sent to the excitation block to generate an excitation effect.
In the control device based on the excitation system of the internet of things, the plastic rod comprises a rod body, an inner tube is concentrically arranged inside the rod body, one end, far away from the excitation ring, of the inner tube is sealed, and a magnetic piston is connected in the inner ring in a sealing and sliding mode.
In the control device based on the excitation system of the internet of things, an inner groove is formed in the excitation ring at the clamping groove, hoses equal to the movable blocks are placed in the inner groove, each hose is connected with one movable block, and the hoses are communicated with the corresponding inner pipe.
In the control device based on the excitation system of the internet of things, the excitation block comprises a shell generating an excitation effect, a cavity is formed in the shell, and a magnetic clamping block is fixedly connected in the cavity.
Compared with the prior art, the invention has the advantages that:
1. when the position of the excitation block needs to be adjusted, the multifunctional gateway can control an external air pump to pump air to the inner pipe, so that the external air pump pushes the magnetic piston to move in the inner pipe, the magnetic piston drives the magnetic slide block in the excitation block to move through magnetic attraction, and the excitation block is driven to move, so that the purpose of changing the position of the excitation block is achieved.
2. According to the invention, the electro-rheological fluid is arranged in the convex block, and after the position of the movable block is adjusted, the electrode in the convex block is electrified to harden the convex block, so that the limiting effect on the movable block is realized, and the position change of the movable block when the excitation block works is avoided.
3. The transmitter, the controller and the multifunctional gateway equipment at the sensing network end can be freely networked, the transmitter acquires and encapsulates data, and the problems that in the prior art, the acquired data needs to be transmitted to the corresponding controller for processing, so that the system processing complexity is high and the error rate is high are solved.
Drawings
Fig. 1 is a schematic structural diagram of a control device based on an excitation system of the internet of things, which is provided by the invention;
fig. 2 is a schematic cross-sectional view of a control device based on an excitation system of the internet of things according to the present invention;
fig. 3 is a schematic structural diagram of an excitation block part in the control device based on the excitation system of the internet of things.
In the figure: the magnetic exciting coil comprises a magnetic exciting ring 1, a concentric groove 2, a limiting ring 3, a convex block 4, a clamping groove 5, a movable block 6, a sliding block 7, a plastic rod 8, a rod body 81, an inner tube 82, a magnetic piston 83, a magnetic exciting block 9, a shell 91, an inner cavity 92, a magnetic clamping block 93, an inner groove 10 and a hose 11.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-3, the control device based on the excitation system of the internet of things comprises an excitation ring 1 and a control system, wherein a concentric groove 2 is formed in the excitation ring 1, a limiting ring 3 is fixedly connected to the inner wall of the excitation ring 1, a clamping groove 5 is formed in the inner wall of the excitation ring 1, a plurality of convex blocks 4 are arranged at the bottom of the excitation ring 1, a plurality of sliding blocks 7 are slidably connected in the clamping groove 5, each sliding block 7 is fixedly connected with a movable block 6, a plastic rod 8 is fixedly connected to each movable block 6, and an excitation block 9 is slidably sleeved on each plastic rod 8;
the bump 4 is made of soft rubber, electrorheological fluid is filled in the bump 4, and two electrodes are arranged in the bump 4.
The control system comprises a sensing network and an Internet of things processing platform; the sensor network comprises a transmitter, a controller and multifunctional gateway equipment, the transmitter and at least one controller are mutually associated, the transmitter acquires original data, packages the acquired original data and equipment information arranged in the transmitter into a data packet and then sends the data packet to the controller, and the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the processing platform of the Internet of things comprises a processing unit, a data storage unit and a configuration unit, wherein the processing unit is used for preprocessing a received data packet, storing the preprocessed data in the data storage unit and/or judging whether the preprocessed data meet preset conditions, if so, adding data nodes and displaying a configuration picture on the configuration unit according to a pre-established configuration picture model;
the transmitter comprises a searching unit; the transmitter sends the encapsulated data packet to the controller specifically as follows: when the association state of the transmitter and at least one controller is normal, the transmitter sends the packaged data packet to the controller associated with the transmitter; when the correlation state of the transmitter and at least one controller is abnormal, the searching unit searches at least one controller which is close to the transmitter and reliable in strength according to the strength of the current signal to send the data packet.
The controller comprises a judging unit, a sending unit and a selecting unit; the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the method specifically comprises the following steps: when the judging unit judges that the controller is in a normal excitation state, the sending unit directly transmits the received data packet to the multifunctional gateway equipment and transmits the data packet to the Internet of things processing platform through the multifunctional gateway equipment; when the judging unit judges that the controller is in an undervoltage state, an underexcitation state or an overexcitation state, the selecting unit selects at least one adjacent and normally usable controller to indirectly transmit the received data packet to the multifunctional gateway device through the sending unit and transmit the data packet to the excitation block 9 through the multifunctional gateway device.
The controller further includes a storage unit; when the controller is in an undervoltage state, an underexcitation state and an overexcitation state, the storage unit caches the received data packet locally, and when excitation is recovered to be normal, historical data are supplemented in the multifunctional gateway equipment through the data time tags.
The management control system of the internet of things comprises at least one control terminal, information set in the transmitter is modified or set through the control terminal by utilizing infrared, WIA-PA or RFID technology, and the information is sent to the excitation block 9 to generate an excitation effect.
The plastic rod 8 comprises a rod body 81, an inner tube 82 is concentrically arranged in the rod body 81, one end of the inner tube 82, which is far away from the excitation ring 1, is sealed, and a magnetic piston 83 is connected in the inner ring 82 in a sealing and sliding manner.
The excitation ring 1 is provided with an inner groove 10 at the position of the clamping groove 5, hoses 11 with the same quantity as the movable blocks 6 are placed in the inner groove 10, each hose 11 is connected with one movable block 6, and the hose 11 is communicated with the corresponding inner pipe 82.
The excitation block 9 includes a casing 91 for generating an excitation effect, a cavity 92 is formed in the casing 91, and a magnetic latch block 93 is fixedly connected in the cavity 92.
When the position of the field excitation block 9 needs to be adjusted, the multifunctional gateway can control an external air pump to pump air to the inner tube 82, so that the external air pump pushes the magnetic piston 83 to move in the inner tube 82, and the magnetic piston 83 drives the magnetic slider 93 in the field excitation block 9 to move through magnetic attraction, so that the field excitation block 9 is driven to move, and the purpose of changing the position of the field excitation block 9 is achieved.
In the invention, the electro-rheological fluid is arranged in the convex block 4, and after the position of the movable block 6 is adjusted, the electrode in the convex block 4 is electrified to harden the convex block 4, thereby realizing the limiting effect on the movable block 6 and avoiding the position change of the movable block 6 when the magnet exciting block 9 works.
In the invention, free networking can be carried out among the transmitter, the controller and the multifunctional gateway equipment at the sensing network end, and the transmitter is used for acquiring and packaging data, so that the problems of high system processing complexity and high error rate caused by the fact that the acquired data needs to be transmitted to the corresponding controller for processing in the prior art are solved;
the transmitter transmits the encapsulated data packet to the controller by using a freely-constructed transmission network, and then the controller transmits the data packet to the multifunctional gateway equipment by using the same networking relation, so that the automatic adjustment and recovery functions of an excitation system are realized, the reliable, stable and flexible transmission of the data packet is ensured, the multifunctional gateway equipment transmits the received data packet to an Internet of things processing platform, the Internet of things processing platform comprises a processing unit, a data storage unit and a configuration unit, the processing unit analyzes and preprocesses the received data packet in sequence, and then the preprocessed data is stored in the data storage unit;
meanwhile, whether the preprocessed data meet preset conditions or not is judged, if so, the preprocessed data are displayed on the configuration unit, wherein the association between the data and variables needs to be intelligently performed in the configuration unit before the data are displayed on the configuration unit.
Although the terms of the excitation ring 1, the concentric groove 2, the limiting ring 3, the protrusion 4, the locking groove 5, the movable block 6, the sliding block 7, the plastic rod 8, the rod body 81, the inner tube 82, the magnetic piston 83, the excitation block 9, the shell 91, the inner cavity 92, the magnetic locking block 93, the inner groove 10, the hose 11, etc. are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (8)
1. The control device based on the Internet of things excitation system comprises an excitation ring (1) and a control system, and is characterized in that the excitation ring (1) is provided with a concentric groove (2), the inner wall of the excitation ring (1) is fixedly connected with a limiting ring (3), the inner wall of the excitation ring (1) is provided with a clamping groove (5), the bottom of the excitation ring (1) is provided with a plurality of convex blocks (4), the clamping groove (5) is connected with a plurality of sliding blocks (7) in a sliding manner, each sliding block (7) is fixedly connected with a movable block (6), each movable block (6) is fixedly connected with a plastic rod (8), and the excitation block (9) is sleeved on the plastic rod (8) in a sliding manner;
the bump (4) is made of soft rubber, electrorheological fluid is filled in the bump (4), and two electrodes are arranged in the bump (4).
2. The control device based on the excitation system of the internet of things as claimed in claim 1, wherein the control system comprises a sensing network and a processing platform of the internet of things; the sensing network comprises a transmitter, a controller and multifunctional gateway equipment, the transmitter and at least one controller are mutually associated, the transmitter acquires original data, packages the acquired original data and equipment information arranged in the transmitter into a data packet and then sends the data packet to the controller, and the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the processing unit preprocesses the received data packet, stores the preprocessed data in the data storage unit and/or judges whether the preprocessed data meet preset conditions, if so, the addition of data nodes and the display of a configuration picture are completed on the configuration unit according to a pre-established configuration picture model;
the transmitter comprises a search unit; the transmitting of the encapsulated data packet to the controller by the transmitter specifically comprises: when the association state of the transmitter and at least one controller is normal, the transmitter sends the packaged data packet to the controller associated with the transmitter; when the correlation state of the transmitter and at least one controller is abnormal, the searching unit searches at least one controller which is close to the transmitter and reliable in strength according to the strength of the current signal and sends the data packet.
3. The control device based on the excitation system of the internet of things according to claim 2, wherein the controller comprises a judging unit, a sending unit and a selecting unit; the controller sends the received data packet to the Internet of things processing platform through the multifunctional gateway equipment;
the method specifically comprises the following steps: when the judging unit judges that the controller is in a normal excitation state, the sending unit directly transmits the received data packet to the multifunctional gateway equipment and transmits the data packet to the Internet of things processing platform through the multifunctional gateway equipment; when the judging unit judges that the controller is in an undervoltage state, an underexcitation state or an overexcitation state, the selecting unit selects at least one adjacent and normally usable controller to indirectly transmit the received data packet to the multifunctional gateway equipment through the sending unit and transmit the data packet to the excitation block (9) through the multifunctional gateway equipment.
4. The control device based on the excitation system of the internet of things according to claim 3, wherein the controller further comprises a storage unit; when the controller is in an undervoltage state, an underexcitation state and an overexcitation state, the storage unit caches the received data packet locally, and when excitation is recovered to be normal, historical data are supplemented in the multifunctional gateway equipment through the data time tag.
5. The control device based on the excitation system of the internet of things as claimed in claim 1, wherein the management control system of the internet of things comprises at least one control terminal, information set in the transmitter is modified or set through the control terminal by utilizing infrared, WIA-PA or RFID technology, and the information is sent to the excitation block (9) to generate an excitation effect.
6. The control device based on the excitation system of the internet of things as claimed in claim 1, wherein the plastic rod (8) comprises a rod body (81), an inner tube (82) is concentrically arranged inside the rod body (81), one end, far away from the excitation ring (1), of the inner tube (82) is sealed, and a magnetic piston (83) is connected inside the inner ring (82) in a sealing and sliding mode.
7. The control device based on the excitation system of the internet of things as claimed in claim 6, wherein the excitation ring (1) is provided with an inner groove (10) at the position of the clamping groove (5), hoses (11) equal to the movable blocks (6) are placed in the inner groove (10), each hose (11) is connected with one movable block (6), and the hoses (11) are communicated with the corresponding inner pipe (82).
8. The control device based on the excitation system of the internet of things as claimed in claim 1, wherein the excitation block (9) comprises a shell (91) generating an excitation effect, a cavity (92) is formed in the shell (91), and a magnetic clamping block (93) is fixedly connected in the cavity (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229079.7A CN112165222A (en) | 2020-11-06 | 2020-11-06 | Control device based on excitation system of Internet of things |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229079.7A CN112165222A (en) | 2020-11-06 | 2020-11-06 | Control device based on excitation system of Internet of things |
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| CN112165222A true CN112165222A (en) | 2021-01-01 |
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| CN202011229079.7A Pending CN112165222A (en) | 2020-11-06 | 2020-11-06 | Control device based on excitation system of Internet of things |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113452173A (en) * | 2021-06-22 | 2021-09-28 | 武汉科大电控设备有限公司 | Control device based on excitation system of Internet of things |
| CN116707187A (en) * | 2023-06-29 | 2023-09-05 | 南通和力磁材有限公司 | Combined limiting device for magnetic ring and use method |
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| CN111661461A (en) * | 2020-06-09 | 2020-09-15 | 杭州聪曦科技有限公司 | Fixing device capable of effectively limiting memory bank position and facilitating transportation |
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| CN101667801A (en) * | 2009-09-28 | 2010-03-10 | 武汉武大电力科技有限公司 | Excitation system of generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113452173A (en) * | 2021-06-22 | 2021-09-28 | 武汉科大电控设备有限公司 | Control device based on excitation system of Internet of things |
| CN113452173B (en) * | 2021-06-22 | 2022-02-22 | 武汉科大电控设备有限公司 | Control device based on excitation system of Internet of things |
| CN116707187A (en) * | 2023-06-29 | 2023-09-05 | 南通和力磁材有限公司 | Combined limiting device for magnetic ring and use method |
| CN116707187B (en) * | 2023-06-29 | 2024-05-28 | 南通和力磁材有限公司 | Combined limiting device for magnetic ring and use method |
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