CN202997514U - Over-moment protection control device for three-phase electric actuator - Google Patents
Over-moment protection control device for three-phase electric actuator Download PDFInfo
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- CN202997514U CN202997514U CN 201220579761 CN201220579761U CN202997514U CN 202997514 U CN202997514 U CN 202997514U CN 201220579761 CN201220579761 CN 201220579761 CN 201220579761 U CN201220579761 U CN 201220579761U CN 202997514 U CN202997514 U CN 202997514U
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Abstract
The utility model relates to an over-moment protection control device for a three-phase electric actuator, which comprises an A/D (Analog/Digital) acquisition unit, a current signal acquisition circuit, a voltage signal acquisition circuit and a central control circuit, wherein the central control circuit mainly comprises a zero-crossing comparison circuit A, a zero-crossing comparison circuit B, a single chip operational circuit, and a rheostat for regulating mechanical efficiency. The over-moment signal data of the electric actuator matched with the over-moment protection device is input to a single chip program of the central control circuit to serve as standard signal data for comparison with an actually acquired over-moment signal. By a pure mathematic induction and computation way, the pressure on the internal space of an electric actuator box body is reduced, and the precision control for over-moment protection is further enhanced as well, the flexibility of adjustable control precision is increased, the problem that control precision is reduced due to decrement of mechanical efficiency after long-term use of the electric actuator is effectively solved, and the durability of the electric actuator is improved.
Description
Technical field
The utility model relates to electric actuator; be particularly related to a kind of three-phase electric actuator and cross force moment protection control device and method; cross the computing capability that the force moment protection control device takes full advantage of single-chip microcomputer; the detection means that is used in conjunction with the replacement traditional sensors by A/D collector, current transformer, voltage transformer; breaking away from original motor learns and mechanics torque formula; utilize pure mathematical method to conclude, reach by multi-faceted adjustable mode the control of the force moment protection excessively effect that high control precision is full of flexibility.
Background technology
Crossing force moment protection is an important controlling unit of electric actuator; its control precision will determine directly that can actuator play a protective role with the valve that is connected to self; in case cross the effect that force moment protection does not have expection, so probably whole system produced great adverse effect.And along with the development of technology, the requirement of actuator has been surmounted the stable and reliable of running already, and enter in requirement to control precision.Cross force moment protection and occupy very important position in control precision.Machinery is the earliest crossed the force moment protection control precision and has not obviously been reached actual demand; control and adopt transducer to carry out high-acruracy survey; pressure to the internal structure of electric actuator is sizable, and its durability and along with the decline of the use control precision of electric actuator is all to guarantee.
Summary of the invention
In view of many-sided defectives such as above-mentioned technology; actual demand and state of development in conjunction with electric actuator; a kind of new technical scheme of crossing force moment protection is proposed; change the modes such as the conventional current sensor that uses, voltage sensor, torque sensor, speed probe; utilize more exquisite A/D collector to coordinate electric current, voltage transformer; break away from Electrical Motor and mechanics formula; by the pure mathematics mode; greatly simplify computational process; adopt multi-faceted adjustable mode, the force moment protection of crossing that reaches flexibility is controlled.
The technical scheme that equipment in the utility model adopts is: a kind of three-phase electric actuator is crossed the force moment protection control device, it is characterized in that, comprise A/D collector, current signal Acquisition Circuit, voltage signal acquisition circuit and maincenter control circuit, the maincenter control circuit mainly comprises zero passage comparison circuit A, zero passage comparison circuit B, single-chip microcomputer computing circuit, conventional electrical control circuit, is used for adjusting rheostat and the hand behaviour display floater of mechanical efficiency;
The analog signals input that described A/D collector adopts the analog to digital converter TLC2543 that Texas Instruments produces is connected with the collector interface circuit with the motor of electric actuator inside; DATA OUT is connected in three control input ends of A/D collector, sheet choosing (CS) end, I/O clock end (I/O CLOCK), data input pin (DATA INPUT) with data output end) be connected with the corresponding ports of single-chip microcomputer in the single-chip microcomputer computing circuit respectively;
Described current signal Acquisition Circuit comprises three current transformers and a rheotrope, three current transformers are set on three live wires of three phase mains, one end of each current transformer is connected with the rheotrope input respectively, other end ground connection; By current transformer path of rheotrope gating, the output of the current transformer that is strobed by rheotrope is connected with the input of I/V change-over circuit, and the input of the zero passage comparison circuit A in the output of I/V change-over circuit and maincenter control circuit is connected; Current transformer connects zero passage comparison circuit A through the I/V change-over circuit; Zero passage comparison circuit A is connected with the HS1.1 pin of single-chip microcomputer;
Described voltage signal acquisition circuit comprises three voltage transformers and a voltage change-over switch, three live wires of the elementary connection three phase mains of three voltage transformers, the secondary of three voltage transformers is connected with the voltage change-over switch input respectively, other end ground connection; By voltage transformer path of voltage change-over switch gating, the input of the zero passage comparison circuit B in the output of the voltage transformer that is strobed by voltage change-over switch and maincenter control circuit is connected, other end ground connection; Voltage transformer connects zero passage comparison circuit B through voltage change-over switch, and zero passage comparison circuit B is connected with the HS1.0 pin that enters single-chip microcomputer;
Motor and collector interface circuit comprise a 10K variable resistor, and variable resistor is connected with motor 0-5V voltage output end, and the resistance of variable resistor convertible tip is corresponding with the value of angular displacement of the running of electric actuator; The variable resistor convertible tip is the 0-5V voltage signal output end of collector interface circuit;
The single-chip microcomputer computing circuit mainly is made of single-chip microcomputer 80C196KC;
The single-chip microcomputer 80C196KC output port of single-chip microcomputer computing circuit connects relay drive circuit, and often the opening of relay/normally-closed contact is serially connected in electric actuator control board power channel, by Control electric actuator control board mains switch;
Single-chip microcomputer 80C196KC control relay in the single-chip microcomputer computing circuit, the Control electric actuator.
the beneficial effect that the utility model reaches: the force moment protection of crossing to electric actuator is controlled, change and to adopt machinery or Electrical Motor mode to calculate the method for moment and protection control in the past, take brand-new computer control mode, conclusion account form by pure mathematics, both alleviated the pressure to electric actuator box house space, further having strengthened again the precision of crossing force moment protection controls, improved the flexibility of capable of regulating control precision, effectively solved the problem that the long-term use of following electric actuator makes the decline of mechanical efficiency bring control precision to descend, improved the durability of electric actuator.
Description of drawings
Fig. 1, the utility model apparatus structure schematic diagram;
Fig. 2, current transformer connection figure;
Fig. 3, voltage transformer winding diagram;
Fig. 4, IV change-over circuit
Fig. 5, motor and collector interface circuit;
Fig. 6, A/D collector and interface microcontroller circuit;
Fig. 7, device full guard process schematic diagram;
Fig. 8, zero passage comparison circuit figure;
Fig. 9, single chip part port sketch;
Figure 10, torque and phase angle relationship curve chart;
Figure 11, electric machine phase current, phase voltage vector.
Embodiment
Understand the utility model for clearer, describe in conjunction with the accompanying drawings and embodiments the utility model in detail:
As extremely shown in Figure 11 in Fig. 1, the three-phase electric actuator is crossed the force moment protection control device, comprise A/D collector 1, current signal Acquisition Circuit 2, voltage signal acquisition circuit 3 and maincenter control circuit, the maincenter control circuit mainly comprises zero passage comparison circuit A51, zero passage comparison circuit B52, single-chip microcomputer computing circuit 6, conventional electrical control circuit 7, is used for adjusting rheostat 8 and the hand behaviour display floater of mechanical efficiency;
The analog signals input that A/D collector 1 adopts the analog to digital converter TLC2543 that Texas Instruments produces is connected with the collector interface circuit with the motor of electric actuator inside; Three control input ends of A/D collector, chip selection cs end, I/O clock end I/O CLOCK, data input pin DATA INPUT are connected with data output end DATA OUT with the corresponding ports of single-chip microcomputer in single-chip microcomputer computing circuit 6 and are connected;
Current signal Acquisition Circuit 2 comprises three current transformers and a rheotrope, three current transformers are set on three live wires of three phase mains, one end of each current transformer is connected with the rheotrope input respectively, other end ground connection; By current transformer path of rheotrope gating, the output of the current transformer that is strobed by rheotrope is connected with the input of I/V change-over circuit, and the input of the zero passage comparison circuit A51 in the output of I/V change-over circuit and maincenter control circuit is connected; The current signal of current transformer output is converted to voltage signal and sends zero passage comparison circuit A51 to through the I/V change-over circuit; Then send into the HS1.1 pin of single-chip microcomputer;
Described voltage signal acquisition circuit 3 comprises three voltage transformers and a voltage change-over switch, three live wires of the elementary connection three phase mains of three voltage transformers, the secondary of three voltage transformers is connected with the voltage change-over switch input respectively, other end ground connection; By voltage transformer path of voltage change-over switch gating, the input of the zero passage comparison circuit B52 in the output of the voltage transformer that is strobed by voltage change-over switch and maincenter control circuit is connected, other end ground connection; The voltage signal of voltage transformer output sends zero passage comparison circuit B52 to through voltage change-over switch, then sends into the HS1.0 pin of single-chip microcomputer;
Motor and collector interface circuit comprise a 10K variable resistor, and variable resistor is connected with motor 0-5V voltage output end, and the resistance of variable resistor convertible tip is corresponding with the value of angular displacement of the running of electric actuator; The variable resistor convertible tip is the 0-5V voltage signal output end of collector interface circuit;
Zero passage comparison circuit A51 is comprised of rectifier diode, resistance and operational amplifier LM324;
Zero passage comparison circuit B52 is comprised of rectifier diode, resistance and operational amplifier LM324;
I/V change-over circuit 4 mainly is comprised of precision current ring receiver chip RCV420 and single supply operational amplifier OPA237
Single-chip microcomputer computing circuit 6 mainly is made of single-chip microcomputer 80C196KC;
The single-chip microcomputer 80C196KC output port of single-chip microcomputer computing circuit 6 connects relay drive circuit, and often the opening of relay/normally-closed contact is serially connected in electric actuator control board power channel, by Control electric actuator control board mains switch;
The single-chip microcomputer 80C196KC of single-chip microcomputer computing circuit (6) obtains representing the signal at phase angle through computing, the A/D collector obtains to collect the 0-5V voltage signal from the collector interface circuit simultaneously, data is sent to single-chip microcomputer 80C196KC after analog-to-digital conversion; Process by single-chip microcomputer computing circuit 6, single-chip microcomputer 80C196KC exports control command, the control relay operating state, and then control the electric actuator running status.
Operation principle of the present utility model:
The output torque formula of electric actuator
,
Known by Electrical Motor, the motor torque formula
In formula: K is proportionality constant; Φ is the amplitude of motor gas-gap rotating magnetic flux; I is the amplitude of motor rotor electric current; θ is the phase difference between rotor current and rotating magnetic flux.
If can obtain torque T by one, two variable in I, Φ, θ; not only the hardware cost of circuit can be reduced but also the amount of calculation of microprocessor can be reduced; as overload protection, the certainty of measurement of bringing thus descends, and is complete acceptable.According to such thought, by to the zero load of motor in electric actuator and fully loaded phase angle variations, find that the relation of T and θ has higher sensitivity, and between actuator output nominal torque and no-load torque, the excursion of θ is: 20
o＜θ＜90
o, can be used as the foundation of measuring T.
Figure 10 is the graph of relation at torque and phase angle, can be found out by Figure 10 a and be actually the conic section relation between torque T and phase difference θ under normal 380V supply power voltage, a large amount of test datas through our factory show simultaneously, torque also has relation with the supply power voltage of motor, as shown in Figure 10 b, if take the 380V supply power voltage as normal voltage, the relation curve of T and θ is calibration curve, and the relation curve of T and θ can regard that all calibration curve is along the left and right translation of θ axle as under other voltages.And then obtain
,
If the voltage of the three-phase of electric actuator motor is respectively
, electric current is respectively
, obtain their expression formula (seeing Figure 11 electric machine phase current, phase voltage vector)
If in circuit design, the sampled signal of A phase phase current and phase voltage is amplified and carries out again the rising edge zero cross fired, namely obtain reflecting the signal of phase place square wave, analyze this signal can find phase angle θ size and
The time difference of rising edge zero passage has linear corresponding relation, and then analyzes and can obtain, as long as record time difference τ, according to the expression formula at phase angle
Get final product.
By single-chip microcomputer internal timer and HS1.0, the interrupt mode work of HS1.1 pin, rising edge reads the HIS time register when triggering, and the voltage positive transition is recorded as the count value n1 of T1 constantly, and the electric current positive transition is recorded as the count value n2 of T1 constantly, n=n1-n2, calculating phase angle θ by two time points work differences are obtained n, is that 50Hz calculates by alternating current, if θ=0.036 * n(special voltage, as 60Hz, herein computing formula is done change and get final product).
Utilize computing capability and electric current, the voltage transformer of single-chip microcomputer can realize the phase angle of real-time motor is detected, the application target of A/D collector is also to detect real-time input voltage, thereby the A/D collector is inputted single-chip microcomputer computing circuit with collector interface circuit and collector with the interface microcontroller circuit by motor and completed from data acquisition to the process of inputting.
The formula of deriving before utilizing can calculate the output torque T of motor, (high level is effective with the output of torque numerical value signal by pin P3.0-P3.7 for single-chip microcomputer, P3.0-P3.3 output signal respectively is that myriabit is effective, kilobit is effective, hundred effectively, and ten effectively, and P3.4-P3.7 exports from the 0-9 numerical signal), output signal through the D/A conversion, is inputed in traditional control circuit.
Thereby adjust resistance by rheostat and change the size of current realization to the adjustment of the mechanical efficiency value of input.Just the output torque that can analog computation goes out electric actuator.And then just can complete the moment defencive function by traditional electric control circuit.Aspect the maincenter control circuit, adjust the input of mechanical efficiency with rheostat, just can play the use that adapts to along with electric actuator, the problem that mechanical efficiency changes.
after the electric actuator entry into service, the voltage transformer summation current transformer begins to detect the signal of telecommunication, and with its conversion, forming peak value is the low-voltage ac signal of 5V, send into afterwards the zero passage comparison circuit, this AC signal is converted into square-wave signal, then send into the HS1.0 of single-chip microcomputer, the HS1.1 pin, obtain representing the signal at phase angle through computing, the A/D collector carries out data acquisition to the voltage of electric actuator simultaneously, carry out the output dtc signal that computing obtains motor with collector interface circuit and collector by motor together with same-phase angle signal after interface microcontroller circuit input single-chip microcomputer computing circuit is sent into single chip machine controlling circuit, single-chip microcomputer is exported the torque numerical value signal by pin P3.0-P3.7, carry out again sending in traditional control circuit after D/A processes, can utilize rheostat to carry out therebetween or adjust mechanical efficiency in analog operational circuit in traditional control circuit, obtain the corresponding signal of telecommunication of load torque through computing circuit, compare through comparison circuit again.If the load torque signal that obtains can bear maximum load torque signal greater than this model electric actuator, traditional control circuit output alarm signal to the electric actuator master control borad and output interrupt signal, stop the running of electric actuator, after the load of electric actuator is adjusted, restart, carry out the detection of next cycle; If the load torque signal that obtains is not more than this signal electric actuator and can bear maximum load torque signal, directly export the signal that next cycle detection is carried out in expression.
According to the above description, can realize scheme of the present utility model in conjunction with art technology.
Claims (3)
1. a three-phase electric actuator is crossed the force moment protection control device, it is characterized in that, comprise A/D collector, current signal Acquisition Circuit, voltage signal acquisition circuit and maincenter control circuit, the maincenter control circuit mainly comprises zero passage comparison circuit A, zero passage comparison circuit B, single-chip microcomputer computing circuit, conventional electrical control circuit, is used for adjusting rheostat and the hand behaviour display floater of mechanical efficiency;
The analog signals input that described A/D collector adopts the analog to digital converter TLC2543 that Texas Instruments produces is connected with the collector interface circuit with the motor of electric actuator inside; Three control input ends of A/D collector, chip selection cs end, I/O clock end I/O CLOCK, data input pin DATA INPUT are connected with data output end DATA OUT with the corresponding ports of single-chip microcomputer in the single-chip microcomputer computing circuit and are connected;
Described current signal Acquisition Circuit comprises three current transformers and a rheotrope, three current transformers are set on three live wires of three phase mains, one end of each current transformer is connected with the rheotrope input respectively, other end ground connection; By current transformer path of rheotrope gating, the output of the current transformer that is strobed by rheotrope is connected with the input of I/V change-over circuit, and the input of the zero passage comparison circuit A in the output of I/V change-over circuit and maincenter control circuit is connected; Current transformer connects zero passage comparison circuit A through the I/V change-over circuit; Zero passage comparison circuit A is connected with the HS1.1 pin of single-chip microcomputer;
Described voltage signal acquisition circuit comprises three voltage transformers and a voltage change-over switch, three live wires of the elementary connection three phase mains of three voltage transformers, the secondary of three voltage transformers is connected with the voltage change-over switch input respectively, other end ground connection; By voltage transformer path of voltage change-over switch gating, the input of the zero passage comparison circuit B in the output of the voltage transformer that is strobed by voltage change-over switch and maincenter control circuit is connected, other end ground connection; Voltage transformer connects zero passage comparison circuit B through voltage change-over switch, and zero passage comparison circuit B is connected with the HS1.0 pin that enters single-chip microcomputer;
Motor and collector interface circuit comprise a 10K variable resistor, and variable resistor is connected with motor 0-5V voltage output end, and the resistance of variable resistor convertible tip is corresponding with the value of angular displacement of the running of electric actuator; The variable resistor convertible tip is the 0-5V voltage signal output end of collector interface circuit;
The single-chip microcomputer computing circuit mainly is made of single-chip microcomputer 80C196KC;
The single-chip microcomputer 80C196KC output port of single-chip microcomputer computing circuit connects relay drive circuit, and often the opening of relay/normally-closed contact is serially connected in electric actuator control board power channel, by Control electric actuator control board mains switch;
Single-chip microcomputer 80C196KC control relay in the single-chip microcomputer computing circuit, the Control electric actuator.
2. a kind of three-phase electric actuator is crossed the force moment protection control device as claimed in claim 1; it is characterized in that; zero passage comparison circuit A is comprised of rectifier diode, resistance and operational amplifier LM324, and zero passage comparison circuit B is comprised of rectifier diode, resistance and operational amplifier LM324.
3. a kind of three-phase electric actuator is crossed the force moment protection control device as claimed in claim 1, it is characterized in that, the I/V change-over circuit mainly is comprised of precision current ring receiver chip RCV420 and single supply operational amplifier OPA237.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579761 CN202997514U (en) | 2012-11-06 | 2012-11-06 | Over-moment protection control device for three-phase electric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579761 CN202997514U (en) | 2012-11-06 | 2012-11-06 | Over-moment protection control device for three-phase electric actuator |
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|---|---|
| CN202997514U true CN202997514U (en) | 2013-06-12 |
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|---|---|---|---|
| CN 201220579761 Expired - Fee Related CN202997514U (en) | 2012-11-06 | 2012-11-06 | Over-moment protection control device for three-phase electric actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505811A (en) * | 2015-01-04 | 2015-04-08 | 南京科远自动化集团股份有限公司 | Motor over-torque protecting method |
-
2012
- 2012-11-06 CN CN 201220579761 patent/CN202997514U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505811A (en) * | 2015-01-04 | 2015-04-08 | 南京科远自动化集团股份有限公司 | Motor over-torque protecting method |
| CN104505811B (en) * | 2015-01-04 | 2017-05-10 | 南京科远自动化集团股份有限公司 | Motor over-torque protecting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20151106 |
|
| EXPY | Termination of patent right or utility model |