CN110608160A - Control method and device for main motor of air compressor set - Google Patents
Control method and device for main motor of air compressor set Download PDFInfo
- Publication number
- CN110608160A CN110608160A CN201910835014.8A CN201910835014A CN110608160A CN 110608160 A CN110608160 A CN 110608160A CN 201910835014 A CN201910835014 A CN 201910835014A CN 110608160 A CN110608160 A CN 110608160A
- Authority
- CN
- China
- Prior art keywords
- main motor
- frequency converter
- controller
- air compressor
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/022—Stopping, starting, unloading or idling control by means of pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a control method and a control device for a main motor of an air compressor set, belonging to the field of motor control and providing the control method and the control device for the main motor of the air compressor set, which can improve the working efficiency of an air compressor, reduce the power consumption and prolong the service life of equipment. In the invention, when the current pressure obtained by the controller is higher than a preset threshold value, the frequency converter receives a low-speed starting signal, and the main motor operates at low speed in a frequency conversion manner; meanwhile, the controller sends a stop signal to the contactor, and the bypass stops; when the current pressure is lower than a preset threshold value, the controller sends an acceleration starting signal to the frequency converter; the main motor accelerates and operates in a frequency conversion mode; if the current frequency converter does not reach the power frequency speed, outputting a fault of the frequency converter; if the speed is reached, after the main motor is started, the frequency converter stops running after receiving signals, the power frequency bypass is conducted, and the main motor runs at high load power. The invention is mainly used for controlling the rotation of the knob.
Description
Technical Field
The invention belongs to the field of motor control, and particularly relates to a control method and a control device for a main motor of an air compressor set.
Background
The main motor of the air compressor is a necessary device in industrial production, and the main motor has large installed power, long running time and high consumed power. The current air compressor mainly adopts star-delta starting or soft starting mode, the motor works at power frequency rotating speed after being started, and the running state of the motor is usually closed-loop control realized by controlling the start and stop of the motor through a detected pressure signal by a controller. The starting device adopting the control scheme has extremely low self-loss, and has the defects that energy is wasted due to pressurization and exhaust in the starting and stopping process of the air compressor, and the service life of an electric system is shortened and the waste of energy is increased due to frequent starting and stopping of air in a period with low air consumption.
And a part of air compressors adopt a frequency conversion starting mode, the starting demand is within the rated power, and undisturbed start and stop in any time interval can be realized. After the motor is started, the motor works under the working condition of frequency conversion, and the load change of the motor is realized by controlling the change of the rotating speed of the motor through a detected pressure signal by a controller to realize the closed-loop control of the gas production. The loss of the starting device is increased by about 2.5% under the control mode, and odd harmonics pollute the electric energy quality of an electric system and increase the electric charge expenditure of other equipment.
Therefore, there is a need for a method and apparatus for controlling the main motor of an air compressor set, which can improve the working efficiency of the air compressor, reduce the power consumption, and prolong the service life of the equipment.
Disclosure of Invention
The invention provides a control method and a device for a main motor of an air compressor unit, aiming at the defects that the existing control method for the air compressor unit can not improve the working efficiency of the air compressor, reduce the power consumption and prolong the service life of equipment.
The invention relates to a control method and a device of a main motor of an air compressor set, which adopts the technical scheme that:
the invention relates to a control method of a main motor of an air compressor set, which comprises the following steps:
step one, a pressure sensor detects an external pressure signal in real time, detection data are transmitted to a controller, and step two is executed when the current pressure obtained by the controller is higher than a preset threshold value; when the current pressure obtained by the controller is lower than a preset threshold value, executing a step three;
secondly, the controller sends a low-speed starting signal to the frequency converter; the frequency converter receives a low-speed starting signal and transmits the signal to the main motor, and the main motor runs at a low speed in a frequency conversion mode; meanwhile, the controller sends a stop signal to the contactor, the contactor switch is disconnected, and the bypass stops;
thirdly, the controller sends an acceleration starting signal to the frequency converter; the frequency converter receives an acceleration starting signal, and the main motor operates in an acceleration frequency conversion mode;
step four, whether the current frequency converter obtained by the controller reaches the power frequency speed or not is judged, and if the current frequency converter does not reach the power frequency speed, the controller outputs a frequency converter fault; if the speed is up, executing a fifth step;
step five, after the main motor is started, the controller sends a stop signal to the frequency converter, the frequency converter stops running after receiving the signal, meanwhile, the controller sends a switch closing signal to the contactor, the contactor switch is closed, the power frequency bypass is conducted, the main motor is communicated with the power supply bus, and the main motor runs at high load power;
and step six, repeating the step one.
Further: in step three, the standard speed of the frequency converter is 50 Hz.
Further: in the fourth step, after the motor stops the variable frequency operation, the main motor is converted from the continuous periodic load operation to the rectangular load discrete operation.
A control device for implementing the main motor control method of the air compressor unit comprises a pressure sensor, a controller, a reactor, a frequency converter and a contactor, wherein the pressure sensor is arranged in the air compressor unit, the output end of the pressure sensor is connected with the input end of the controller, one end of the reactor is connected with a bus, the other end of the reactor is connected with one end of the frequency converter, the other end of the frequency converter is connected with the bus, the output end of the frequency converter is connected with the input end of the main motor, the input end of the contactor is connected with the output end of the controller, the frequency converter is bidirectionally connected with the controller, and a bypass of the main motor is communicated with a power grid.
The control method and the device of the main motor of the air compressor set have the advantages that:
the invention relates to a control method and a device of a main motor of an air compressor set, which realize start-stop control of the air compressor at any time by adopting a frequency conversion starting mode, after the air compressor is started, the main motor of the air compressor is directly connected with a power grid by a contactor bypass, a frequency converter stops working, the self loss and harmonic generation of the device are reduced, the main motor compresses air at full speed, after an upper limit feedback signal of a pressure sensor is received, the bypass contactor is disconnected, the frequency converter starts working, the main motor is changed into a low-speed standby state from a continuous power frequency operating working condition, only the lowest rotating speed allowed by the air compressor is maintained at the moment, and the pressurizing link during shutdown, exhaust and startup is avoided so as to save. The control method can avoid the energy loss of the air compressor during starting and stopping, improve the working efficiency of the air compressor, reduce the power consumption and prolong the service life of the equipment. To avoid exhaust at shutdown and pressurization at start-up, the main motor is switched to variable frequency operation. The continuous and efficient operation of the main motor is realized, the working efficiency of the air compressor is improved, the power consumption is reduced, and the service life of the air compressor system is prolonged.
Drawings
FIG. 1 is a flow chart of a method of controlling a main motor of an air compressor assembly;
fig. 2 is a schematic structural diagram of the control device.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
The present embodiment is described with reference to fig. 1 and fig. 2, in the present embodiment, a method for controlling a main motor of an air compressor set according to the present embodiment includes the following steps:
step one, a pressure sensor detects an external pressure signal in real time, detection data are transmitted to a controller, and step two is executed when the current pressure obtained by the controller is higher than a preset threshold value; when the current pressure obtained by the controller is lower than a preset threshold value, executing a step three;
secondly, the controller sends a low-speed starting signal to the frequency converter; the frequency converter receives a low-speed starting signal and transmits the signal to the main motor, and the main motor runs at a low speed in a frequency conversion mode; meanwhile, the controller sends a stop signal to the contactor, the contactor switch is disconnected, and the bypass stops;
thirdly, the controller sends an acceleration starting signal to the frequency converter; the frequency converter receives an acceleration starting signal, and the main motor operates in an acceleration frequency conversion mode;
step four, whether the current frequency converter obtained by the controller reaches the power frequency speed or not is judged, and if the current frequency converter does not reach the power frequency speed, the controller outputs a frequency converter fault; if the speed is up, executing a fifth step;
step five, after the main motor is started, the controller sends a stop signal to the frequency converter, the frequency converter stops running after receiving the signal, meanwhile, the controller sends a switch closing signal to the contactor, the contactor switch is closed, the power frequency bypass is conducted, the main motor is communicated with the power supply bus, and the main motor runs at high load power;
and step six, repeating the step one.
More specifically: in step three, the standard speed of the frequency converter is 50 Hz.
More specifically: in the fourth step, after the motor stops the variable frequency operation, the main motor is converted from the continuous periodic load operation to the rectangular load discrete operation.
The specific implementation method comprises the following steps: the controller receives a starting signal of the pressure sensor and sends a starting signal to the frequency converter, the motor is started in a frequency conversion mode, after the motor is started, the controller sends a frequency conversion stopping operation signal and sends a contactor KM closing signal, the main motor and a power supply line are directly communicated with an air compressor set to operate in a power frequency mode, when the pressure sensor reaches an upper limit, the controller sends a stopping signal to disconnect the contactor KM, the frequency converter operates at the lowest frequency allowed by the air compressor, exhaust during stopping and pressurization during starting are avoided, and the main motor is converted into frequency conversion operation. The reciprocating operation realizes the continuous and efficient operation of the main motor. The working efficiency of the air compressor is improved, the power consumption is reduced, and the service life of the air compressor system is prolonged.
A control device for implementing the main motor control method of the air compressor unit comprises a pressure sensor, a controller, a reactor, a frequency converter and a contactor, wherein the pressure sensor is arranged in the air compressor unit, the output end of the pressure sensor is connected with the input end of the controller, one end of the reactor is connected with a bus, the other end of the reactor is connected with one end of the frequency converter, the other end of the frequency converter is connected with the bus, the output end of the frequency converter is connected with the input end of the main motor, the input end of the contactor is connected with the output end of the controller, the frequency converter is bidirectionally connected with the controller, and a bypass of the main motor is communicated with a power grid.
The method is characterized in that start-stop control of the air compressor in any time is realized by adopting a frequency conversion starting mode, a main motor of the air compressor is directly connected with a power grid through a contactor bypass after starting, a frequency converter stops working to reduce self loss and harmonic generation of a device, compressed air is manufactured at full speed by the main motor, after an upper limit feedback signal of a pressure sensor is received, the bypass contactor is disconnected, the frequency converter starts working, the main motor is changed into a low-speed standby state from a continuous power frequency operation working condition, only the lowest rotating speed allowed by the air compressor is kept at the moment, and a pressurizing link during stopping, exhausting and starting is avoided to save energy. The control method can avoid the energy loss of the air compressor during starting and stopping, improve the working efficiency of the air compressor, reduce the power consumption and prolong the service life of the equipment.
Claims (4)
1. A control method of a main motor of an air compressor set is characterized by comprising the following steps:
step one, a pressure sensor detects an external pressure signal in real time, detection data are transmitted to a controller, and step two is executed when the current pressure obtained by the controller is higher than a preset threshold value; when the current pressure obtained by the controller is lower than a preset threshold value, executing a step three;
secondly, the controller sends a low-speed starting signal to the frequency converter; the frequency converter receives a low-speed starting signal and transmits the signal to the main motor, and the main motor runs at a low speed in a frequency conversion mode; meanwhile, the controller sends a stop signal to the contactor, the contactor switch is disconnected, and the bypass stops;
thirdly, the controller sends an acceleration starting signal to the frequency converter; the frequency converter receives an acceleration starting signal, and the main motor operates in an acceleration frequency conversion mode;
step four, whether the current frequency converter obtained by the controller reaches the power frequency speed or not is judged, and if the current frequency converter does not reach the power frequency speed, the controller outputs a frequency converter fault; if the speed is up, executing a fifth step;
step five, after the main motor is started, the controller sends a stop signal to the frequency converter, the frequency converter stops running after receiving the signal, meanwhile, the controller sends a switch closing signal to the contactor, the contactor switch is closed, the power frequency bypass is conducted, the main motor is communicated with the power supply bus, and the main motor runs at high load power;
and step six, repeating the step one.
2. The method of claim 1, wherein in step three, the standard speed of the inverter is 50 Hz.
3. The method as claimed in claim 2, wherein in step four, after the motor stops the inverter operation, the main motor is switched from the continuous periodic load operation to the rectangular load discrete operation.
4. A control device for implementing the main motor control method of the air compressor set according to claim 1, characterized in that the control device comprises a pressure sensor, a controller, a reactor, an inverter and a contactor, wherein the pressure sensor is arranged in the air compressor set, the output end of the pressure sensor is connected with the input end of the controller, one end of the reactor is connected with a bus, the other end of the reactor is connected with one end of the inverter, the other end of the inverter is connected with the bus, the output end of the inverter is connected with the input end of the main motor, the input ends of the contactors are connected with the output end of the controller, the inverter is connected with the controller in a bidirectional way, and a bypass of the main motor is connected with a power grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835014.8A CN110608160A (en) | 2019-09-05 | 2019-09-05 | Control method and device for main motor of air compressor set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835014.8A CN110608160A (en) | 2019-09-05 | 2019-09-05 | Control method and device for main motor of air compressor set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608160A true CN110608160A (en) | 2019-12-24 |
Family
ID=68892130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910835014.8A Pending CN110608160A (en) | 2019-09-05 | 2019-09-05 | Control method and device for main motor of air compressor set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110608160A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6356195A (en) * | 1986-08-25 | 1988-03-10 | Toshiba Corp | Refrigeration unit |
| CN201063581Y (en) * | 2007-08-09 | 2008-05-21 | 上海第一开关制造有限公司 | Speed regulation device for motor |
| CN201467065U (en) * | 2009-08-14 | 2010-05-12 | 河南中烟工业有限责任公司 | Variable frequency control system of air compressor motor |
| CN101725515A (en) * | 2009-11-12 | 2010-06-09 | 厦门市万树科技有限公司 | Air compressor energy-saving control method |
| CN202125419U (en) * | 2011-04-28 | 2012-01-25 | 徐跃 | Frequency conversion and electricity-saving device of air compressor |
| CN202612060U (en) * | 2012-06-01 | 2012-12-19 | 深圳市南方安华电子科技有限公司 | Air compressor |
| CN203499969U (en) * | 2013-09-24 | 2014-03-26 | 广州三晶电气有限公司 | Air compressor frequency conversion driving system |
| CN207896900U (en) * | 2018-01-11 | 2018-09-21 | 江西格雷特压缩机有限公司 | Frequency converter failure replacement circuit |
-
2019
- 2019-09-05 CN CN201910835014.8A patent/CN110608160A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6356195A (en) * | 1986-08-25 | 1988-03-10 | Toshiba Corp | Refrigeration unit |
| CN201063581Y (en) * | 2007-08-09 | 2008-05-21 | 上海第一开关制造有限公司 | Speed regulation device for motor |
| CN201467065U (en) * | 2009-08-14 | 2010-05-12 | 河南中烟工业有限责任公司 | Variable frequency control system of air compressor motor |
| CN101725515A (en) * | 2009-11-12 | 2010-06-09 | 厦门市万树科技有限公司 | Air compressor energy-saving control method |
| CN202125419U (en) * | 2011-04-28 | 2012-01-25 | 徐跃 | Frequency conversion and electricity-saving device of air compressor |
| CN202612060U (en) * | 2012-06-01 | 2012-12-19 | 深圳市南方安华电子科技有限公司 | Air compressor |
| CN203499969U (en) * | 2013-09-24 | 2014-03-26 | 广州三晶电气有限公司 | Air compressor frequency conversion driving system |
| CN207896900U (en) * | 2018-01-11 | 2018-09-21 | 江西格雷特压缩机有限公司 | Frequency converter failure replacement circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102220961B (en) | Air compressor energy-saving and voltage-stabilization control system and air compressor | |
| CN204140356U (en) | A kind of mine air compressor control system based on PLC | |
| CN106050607B (en) | A kind of energy-saving air compressor | |
| CN101514698A (en) | Intelligent energy saving control system of air compressor | |
| CN201467065U (en) | Variable frequency control system of air compressor motor | |
| CN202125419U (en) | Frequency conversion and electricity-saving device of air compressor | |
| CN102045023A (en) | Novel multifunction energy-saving frequency conversion control device for oil pumping machine in oil field | |
| CN202034929U (en) | Control device capable of driving double-motor soft startup through high-voltage double frequency conversion | |
| CN110043785A (en) | A kind of novel fan bearing shell lubrication thin oil station electric-control system | |
| CN110608160A (en) | Control method and device for main motor of air compressor set | |
| CN201111324Y (en) | Energy-saving apparatus of motor | |
| CN215498789U (en) | Compressed air power frequency switching frequency conversion control system | |
| CN213235405U (en) | Mining emulsion pump station and frequency converter used by same | |
| Yang et al. | Control system design for contant-pressure water supply | |
| CN202690450U (en) | Frequency conversion starting-based screw air compressor starting system | |
| CN203962358U (en) | A kind of power air compressor | |
| CN202402267U (en) | Intelligent control suction system for dental treatment equipment | |
| CN202612060U (en) | Air compressor | |
| CN201319576Y (en) | Special frequency-conversion feedback energy-saving device for oil pumping unit in oil field | |
| CN206429363U (en) | Air compressor machine frequency conversion one drag two compressed air system | |
| CN203348054U (en) | Air compressor for power | |
| CN219774380U (en) | Blower unit control device for turbine and motor opposite-side coaxial driving | |
| CN207559894U (en) | A kind of fuel frequency converter | |
| CN214661012U (en) | Sewage treatment fan frequency conversion constant voltage speed governing PLC control system | |
| CN201232636Y (en) | Intelligent electricity-saving control equipment for air compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191224 |