CN101183784A - Intelligent electric actuator with overload protection function - Google Patents
Intelligent electric actuator with overload protection function Download PDFInfo
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- CN101183784A CN101183784A CNA2007101502575A CN200710150257A CN101183784A CN 101183784 A CN101183784 A CN 101183784A CN A2007101502575 A CNA2007101502575 A CN A2007101502575A CN 200710150257 A CN200710150257 A CN 200710150257A CN 101183784 A CN101183784 A CN 101183784A
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Abstract
The invention relates to an intelligent electric actuator with an overload protection function. The invention provides motor overload protection function of the electric actuator, which comprises a motor current detection circuit, a position detection circuit, a central processing circuit and a motor driven circuit. The invention utilizes Hall current sensor of LEM Corporation to detect motor current, and adopts high performance digital signal controller dsPIC6012A and the peripheral circuit of Microchip Corporation for high-precision and fast signal processing, overload protection and other control function. The invention has the advantages of improving the intellectualization and microcomputerization of the electric actuator better, ensuring better real time character and reliability of the electric actuator, and enabling the electric actuator to meet development requirements of modern industry.
Description
[technical field]: the invention belongs to industrial instrument control technology field, realize a kind of intelligent electric actuating mechanism with overload protection function.
[background technology]: electric operator series is a Terminal Type control instrument, is widely used in industries such as large-size chemical, oil, metallurgy, electric power pressure, flow, temperature are regulated.Electric operator is the visual plant in the industrial process control, it receives the analog signal (generally being 4～20mA current signal) of self tuning regulator or the digital signal of host computer, and be converted into electric operator corresponding angular or straight-line displacement output, go to drive actions such as valve, baffle plate, to realize automatic control to various procedure parameters.But along with the raising day by day of domestic industry automatization level, also more and more higher to the requirement of electric operator technical performance, the Intellectualized electric actuator that presses for a new generation replaces the product of use at present, to improve automaticity and production efficiency.
[summary of the invention]: the objective of the invention is to improve the electric operator reliability, realize the overload protection function of electric operator, a kind of intelligent electric actuating mechanism with overload protection function is provided.
The present invention at first studies the application Control Technique of Microcomputer; use the high-speed high-performance embedded microcontroller to realize the high accuracy and the fast processing of signal; the electric operator design of design overload protection function; utilize LEM company Hall type current sensor senses current of electric; adopt the high performance digital signal controller dsPIC6012A and the peripheral circuit thereof of Microchip company; realize the high accuracy and the fast processing of signal; realize overload protection and other controlled function; improve the intellectuality of electric operator better; the microcomputer level; and can guarantee that electric operator has good real-time performance; reliability makes electric operator better adapt to the development of modern industry requirement.
Intelligent electric actuating mechanism with overload protection function provided by the invention comprises:
Motor current detecting circuit: be used to detect current of electric, and will send into central processing circuit after the current signal processing that detect;
Position detecting circuit: be used to detect valve aperture of living in position, and detection signal is isolated, sent into central processing circuit after amplification and the filtering;
Central processing circuit: be used for the image data that motor current detecting circuit and position detecting circuit are sent into is carried out calculation process, and the control signal of result is transported to motor-drive circuit through the photoelectricity isolated location, realize control to motor-drive circuit;
Motor-drive circuit: be used to accept the control signal that central processing circuit is carried, and then the running of control motor, realize the unlatching of valve or close;
Communication interface circuit: be connected with central processing circuit is two-way, and link to each other with host computer with communication cable, upload the motor-drive circuit state information, be convenient to host computer and monitor to host computer by interface.
Wherein:
Described motor current detecting circuit comprises:
1) current sensor adopts LEM company current sensor senses current of electric, transducer output milliampere level alternating current.
2) current-voltage conversion and filter circuit adopt bridge rectifier and sampling resistor, and the ac current signal that current sensor is exported is converted to voltage signal, sends into analog to digital conversion circuit after filter circuit filtering.
3) analog to digital conversion circuit: 12 built-in A/D modular converters by the high performance digital signal controller dsPIC6012A of Microchip company constitute.
Above-mentioned said position detecting circuit comprises:
1) position transducer: adopt the accurate rotational potentiometer of high performance conductive plastics to detect valve aperture of living in position.Valve opening has corresponding one by one linear relationship with the output voltage values of feedback potentiometer.
2) signal conditioning circuit: to isolating by the voltage signal of position transducer input, sending into the A/D change-over circuit after amplification and the Filtering Processing.
3) A/D change-over circuit: 12 A/D modular converters by the high performance digital signal controller dsPIC6012A of Microchip company constitute.
Above-mentioned said central processing circuit selects for use the high performance digital signal controller dsPIC6012A of Microchip company as the control core, and the data of gathering are carried out calculation process, realizes work such as Electric Machine Control.
Above-mentioned said motor-drive circuit is made up of zero-cross ssr and solid-state relay drive circuit, by controller dsPIC6012A control solid-state relay turn-on and turn-off, realizes the rotating control of motor.
The said intelligent electric actuating mechanism operation principle with overload protection function of the present invention is: control unit is controlled and is monitored the electric operator running status.Obtain valve position set information and current valve position information by timing acquiring data or communication interface, gather current valve position information by position detecting circuit simultaneously, and be input to central processing circuit, central processing circuit utilizes given information and current valve position information, the start and stop of control motor are moved by motor-drive circuit, thereby the change valve opening reaches the dead band requirement up to the two, stops motor-driven.In the electric motor starting process, detect motor simultaneously and whether transship or stall, carry out corresponding protection by motor current detecting circuit.
Advantage of the present invention and good effect:
1, utilizes the high performance digital signal process chip to realize the control of electric operator, improve the speed and the precision of control to a great extent;
2, detect motor by motor current detecting circuit in the electric motor starting process and whether transship or stall, carry out corresponding protection, improve actuator's intelligent level;
3, reduce the restriction of Yin Putong single-chip microcomputer processing speed and the control hysteresis and the precision defective that cause, make the The whole control device have good adjusting function and reliability;
4, this invention hardware circuit is simple, the output trigger impulse is safe and reliable, precision of real time control is high, stability and reliability that can bigger raising device;
5, modularized design is adopted in whole electric operator design, and electric operator of the present invention has been realized intelligent functions, has wide market application prospect.
[description of drawings]:
Fig. 1 is the overall structure schematic diagram with intelligent electric actuating mechanism of overload protection function.
Fig. 2 is the motor current detecting circuit structural representation.
Fig. 3 is the position detecting circuit structural representation.
Fig. 4 is a central data treatment circuit structural representation.
Fig. 5 is the motor-drive circuit structural representation.
[embodiment]:
Embodiment 1:
A kind of intelligent electric actuating mechanism (see figure 1) with overload protection function, it is characterized in that it adopts the high performance digital signal controller dsPIC6012A of Microchip company as central processing unit, whole device is made up of motor current detecting circuit, position detecting circuit, central data treatment circuit, motor-drive circuit and communication interface circuit, wherein, comprise photoelectric isolating circuit in the motor-drive circuit; Said motor current detecting circuit connects current sensor, its output connects the input of the A/D modular converter of central data treatment circuit, the input of said position detecting circuit connects the accurate rotational potentiometer of high performance conductive plastics of external circuit, its output connects the input of the A/D modular converter of central data treatment circuit, the output of central data treatment circuit connects the motor-drive circuit that comprises photoelectric isolating circuit, and the output of motor-drive circuit connects the zero-cross ssr input.
Above-mentioned said motor current detecting circuit (see figure 2) is made of with filter circuit current sensor, current-voltage conversion; The current-voltage conversion is converted to voltage signal with the ac current signal that filter circuit is exported current sensor, send into analog to digital conversion circuit after filter circuit filtering, analog to digital conversion circuit is made of 12 built-in A/D modular converters of the digital signal controller dsPIC6012A of Microchip company.
Above-mentioned said position detecting circuit (see figure 3) is made of position transducer, signal conditioning circuit and A/D change-over circuit; Signal conditioning circuit is sent into analog to digital conversion circuit after the position transducer voltage signal of gathering is handled, and analog to digital conversion circuit is made of 12 built-in A/D modular converters of the high performance digital signal controller dsPIC6012A of Microchip company.
Above-mentioned said central data treatment circuit comprises (see figure 4):: dsPIC6012A chip, crystal oscillating circuit and reset circuit, reference voltage source circuit; The software program of compiling set executive condition control dsPIC6012A chip valve location detected and send relevant control command; Crystal oscillating circuit provides clock signal to the dsPIC6012A chip; Reset circuit provides power-on reset signal; The reference voltage source circuit provides A/D conversion reference voltage.
Above-mentioned said dsPIC6012A chip comprises big capacity flash memory, a plurality of 32 bit timing devices and SPI, SCI, CAN multiple interfaces, and 8 road PWM control waves are provided; Crystal oscillating circuit is by providing capacitor C 3, C4 and the crystal oscillator body U2 of clock signal to constitute for the dsPIC6012A chip.
Above-mentioned said motor-drive circuit (see figure 5) is made up of zero-cross ssr and solid-state relay drive circuit, by controller dsPIC6012A control solid-state relay turn-on and turn-off, realize the rotating of motor startup, control such as commutate, stop; Solid-state relay drive signal D1, D2 control first, second solid-state relay SSR1 respectively, and SSR2 realizes motor positive and inverse control; The just commentaries on classics of output RF0, the RF1 of controller control servomotor, reverse and stop, and then control realizes that valve location equates with given valve position value.
Claims (5)
1. the intelligent electric actuating mechanism with overload protection function is characterized in that comprising;
Motor current detecting circuit: be used to detect current of electric, and will send into central processing circuit after the current signal processing that detect;
Position detecting circuit: be used to detect valve aperture of living in position, and detection signal is isolated, sent into central processing circuit after amplification and the filtering;
Central processing circuit: be used for the image data that motor current detecting circuit and position detecting circuit are sent into is carried out calculation process, and the control signal of result is transported to motor-drive circuit through the photoelectricity isolated location, realize control to motor-drive circuit;
Motor-drive circuit: be used to accept the control signal that central processing circuit is carried, and then the running of control motor, realize the unlatching of valve or close;
Communication interface circuit: be connected with central processing circuit is two-way, and link to each other with host computer with communication cable, upload the motor-drive circuit state information, be convenient to host computer and monitor to host computer by interface.
2. intelligent electric actuating mechanism according to claim 1 is characterized in that described motor current detecting circuit is made of current sensor, current-voltage conversion and filter circuit, analog to digital conversion circuit; The current-voltage conversion is converted to voltage signal with the ac current signal that filter circuit is exported current sensor, send into analog to digital conversion circuit after filter circuit filtering, analog to digital conversion circuit is made of 12 built-in A/D modular converters of the digital signal controller dsPIC6012A of Microchip company.
3. intelligent electric actuating mechanism according to claim 1 is characterized in that described position detecting circuit is made of position transducer, signal conditioning circuit and A/D change-over circuit; Signal conditioning circuit is sent into the A/D change-over circuit after the position transducer voltage signal of gathering is handled, and the A/D change-over circuit is made of 12 built-in A/D modular converters of the digital signal controller dsPIC6012A of Microchip company.
4. intelligent electric actuating mechanism according to claim 1 is characterized in that described central processing circuit comprises: dsPIC6012A chip, crystal oscillating circuit and reset circuit, reference voltage source circuit; The software program of compiling set executive condition control dsPIC6012A chip valve location detected and send relevant control command; Crystal oscillating circuit provides clock signal to the dsPIC6012A chip; Reset circuit provides power-on reset signal; The reference voltage source circuit provides A/D conversion reference voltage.
5. motor-drive circuit according to claim 1 comprises by solid-state relay and solid-state relay drive circuit and forming, finish motor positive and inverse startup, control such as commutate, stop; Solid-state relay drive signal D1, D2 control first, second solid-state relay SSR1 respectively, and SSR2 realizes motor positive and inverse control; The just commentaries on classics of output RF0, the RF1 of controller control servomotor, reverse and stop, and then control realizes that valve location equates with given valve position value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101502575A CN101183784A (en) | 2007-11-21 | 2007-11-21 | Intelligent electric actuator with overload protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101502575A CN101183784A (en) | 2007-11-21 | 2007-11-21 | Intelligent electric actuator with overload protection function |
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| CN101183784A true CN101183784A (en) | 2008-05-21 |
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| CNA2007101502575A Pending CN101183784A (en) | 2007-11-21 | 2007-11-21 | Intelligent electric actuator with overload protection function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832419A (en) * | 2009-03-12 | 2010-09-15 | 艾默生过程管理电力和水力解决方案有限公司 | The method of arbitrate valve position sensor redundancy and device |
| CN102270960A (en) * | 2011-07-27 | 2011-12-07 | 重庆金美通信有限责任公司 | Singlechip-based DC brushed motor controller |
| CN102322545A (en) * | 2011-07-21 | 2012-01-18 | 天津理工大学 | Control device of spray electromagnetic valve in coal yard |
| CN103474961A (en) * | 2013-08-29 | 2013-12-25 | 耿哲 | Novel water resource manager |
| CN103672104A (en) * | 2013-12-17 | 2014-03-26 | 上海国鼎数码科技有限公司 | Torque control system and method of electric actuator |
| CN106015689A (en) * | 2016-07-16 | 2016-10-12 | 刘和勇 | Improved type electric actuator control panel |
| CN109555897A (en) * | 2019-01-18 | 2019-04-02 | 黄强 | Valve location detection method, position sensor of valve and valve |
| CN109656156A (en) * | 2017-10-12 | 2019-04-19 | 苏州宝时得电动工具有限公司 | Electric tool starts control method and device |
-
2007
- 2007-11-21 CN CNA2007101502575A patent/CN101183784A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832419A (en) * | 2009-03-12 | 2010-09-15 | 艾默生过程管理电力和水力解决方案有限公司 | The method of arbitrate valve position sensor redundancy and device |
| CN101832419B (en) * | 2009-03-12 | 2014-05-14 | 艾默生过程管理电力和水力解决方案有限公司 | Methods and apparatus to arbitrate valve position sensor redundancy |
| CN102322545A (en) * | 2011-07-21 | 2012-01-18 | 天津理工大学 | Control device of spray electromagnetic valve in coal yard |
| CN102270960A (en) * | 2011-07-27 | 2011-12-07 | 重庆金美通信有限责任公司 | Singlechip-based DC brushed motor controller |
| CN103474961A (en) * | 2013-08-29 | 2013-12-25 | 耿哲 | Novel water resource manager |
| CN103672104A (en) * | 2013-12-17 | 2014-03-26 | 上海国鼎数码科技有限公司 | Torque control system and method of electric actuator |
| CN103672104B (en) * | 2013-12-17 | 2016-10-05 | 上海国鼎数码科技有限公司 | A kind of YE torque control system and control method thereof |
| CN106015689A (en) * | 2016-07-16 | 2016-10-12 | 刘和勇 | Improved type electric actuator control panel |
| CN109656156A (en) * | 2017-10-12 | 2019-04-19 | 苏州宝时得电动工具有限公司 | Electric tool starts control method and device |
| CN109555897A (en) * | 2019-01-18 | 2019-04-02 | 黄强 | Valve location detection method, position sensor of valve and valve |
| CN109555897B (en) * | 2019-01-18 | 2024-01-19 | 黄强 | Valve position detection method, valve position sensor and valve |
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Open date: 20080521 |