CN201557071U - Restarting device of motor after pressure loss - Google Patents

Abstract

The utility model discloses a restarting device of a motor after pressure loss, which is characterized in that the alternating current analog sampling signal output ends of a current transformer and a voltage transformer which are connected with a power grid are connected with an AD conversion unit module of a singlechip dsPIC 6014 by a TLC2264 operational amplifier; a control circuit is connected with the singlechip dsPIC 6014 by adopting a PA1a-5V relay; a control level signal is connected into a gate circuit 74HC86 which is connected with a module MC1413; and the module MC1413 is connected with a control relay. A low-voltage motor restarting controller adopts the advanced singlechip technology and the alternating current signal sampling principle, has small, exquisite and compact structure, strong anti-interference capability and reliable performance. The technical difficulties in the design of the device are as follows: system working power supply, low power consumption design, accurate measurement of the working pressure of the motor, and electromagnetic compatibility of the whole device. The restarting device is widely applied to the restarting of the motors of the unattended equipment of large-scale enterprises, deep wells, oil field oil extraction machines and the like for the continuous production of petroleum, metallurgy, power and the like.

Description

Motor decompression Restarter

Technical field

The utility model relates to a kind of motor self-starting device.

Background technology

Along with industrial expansion, the power supply-distribution system that has thousands of motor in the enterprise is of common occurrence.So the probability that breaks down of huge power supply-distribution system is very high, can cause the electrical network instantaneous loss of pressure in case break down, and will cause tens even hundreds of platform motor out of service.After line voltage recovered, these motor clusters can not resume operation automatically, must fit into pedestrian worker by technological operation personnel and electrician personnel and restart.Motor is the major impetus of rotating machinery in the enterprise normally, the stoppage in transit of a large amount of motor will cause the confusion of very large economy loss and production to enterprise, particularly other equipment and personal injury also may cause in the very high enterprise of Large Scale and Continuous production requirement, lose even more serious.

Motor is restarted technology in batches, has just occurred as far back as the fifties, belongs to decentralized control formula (the separate unit motor is established Restarter) and regularly restarts in batches.Regularly restart can not real-time tracking power supply-distribution system stability in batches, and when restarting, whether busbar voltage is too low in batches, and whether inlet wire current too mostly can't consider to have certain risk; For avoid batch with batch between to restart electric current overlapping, every batch of time will be designed very longly, this batch started and finished, and do not arrive as if timing, can not start next group; If certain a collection of or several batches all do not have the motor (not opening) that will restart as motor, must wait for that these a collection of or several batches of times in the past after, could start next group; Voltage height when restarting, load are light etc. can shorten the factor of the time of restarting and also can't consider.Therefore, timing is restarted chronic in batches, and its practical function is little, does not therefore apply.

Summary of the invention

At the defective that existing motor decompression Restarter exists, the utility model provides a kind of highly versatile, realizes decentralized control; Good reliability guarantees fail safe; Volume is little, and wiring is simple, and motor recovers short motor decompression Restarter of former operating condition time.

Solve the problems of the technologies described above the concrete technical measures of being taked: the fault of power supply-distribution system is inevitable, the technology of restarting of motor is to one of remedial measure after the power supply-distribution system fault, purpose is further to improve the reliability of power supply-distribution system to the motor power supply, therefore requiring to be used for motor, to restart the reliability of the element of technology and equipment very high, otherwise motor is restarted technology and just lost due value.

Alternating current motor generally adopts A.C. contactor as starting switch, its operating power is also taken from power supply, when externally fed power supply pop-off, A.C. contactor then disconnects owing to losing operating power, even external power source moment restores electricity again, motor still needs manual intervention could recover running.This product is for tackling the intelligentized New-type electric machine decompression of a kind of height Restarter of this power supply transient fault, by real-time monitoring to power supply-distribution system, can judge whether to meet restart condition apace, adopt advanced embedded technology design, volume is little, wiring is simple, can set the different self-starting time as required, satisfy the requirement of actual production operation; Adopt of the power supply design of the low-power consumption micro single-chip microcomputer of excellent performance, when the instantaneous disappearance of externally fed power supply, have backup battery to power at once in conjunction with uniqueness.Adopt this technology can solve the production practical problem that rolling electricity brings, when ultralow and power-off time is less than setting time when line voltage, as long as power system restoration is normal, motor will recover former operating condition voluntarily.

A kind of motor decompression Restarter is characterized in that: single-chip microcomputer dsPIC6014 power supply is provided by the output of MC7805, and the MC7805 input connects the 12V power module outlet; It is clock frequency that the OSC1 of single-chip microcomputer dsPIC6014 and OSC2 pin connect the 4M crystal oscillator; The current transformer that connects electrical network exchanges the analog sampling signal output part with voltage transformer, through 2 input pins that comprise the TLC2264 operational amplifier of four tunnel amplifiers respectively, the AD converting unit module that connects single-chip microcomputer dsPIC6014, A, B, C three-phase voltage signal output connects AD channel AN3 respectively, AN5, AN7, A, B, C three-phase current signal output connects AD channel AN4, AN6, AN8, A phase voltage sampled signal output connects the input that AD channel AN9 connects discharge circuit and LM385 simultaneously, and discharge circuit and LM385 output form the input capture passage RD8 that square-wave signal enters single-chip microcomputer dsPIC6014; Control loop adopts the PA1a-5V relay, its common port connects the 5V high level, the control level signal output part of 9 IO pin RG12 of single-chip microcomputer dsPIC6014, RG14, RD2, RD3, RA14, RA15, RC13, RC14, RD13 in twos one group connect input into gate circuit 74HC86, gate circuit 74HC86 input dome module MC1413 signal input part, module MC1413 signal output part connect drive controlling relay input.

The beneficial effects of the utility model: this low voltage motor is restarted controller and has been adopted advanced singlechip technology and AC signal sampling principle, and the structure compact is anti-interference strong, dependable performance.Wherein the electromagnetic compatibility of the accurate measurement of system works power supply, low power dissipation design, motor operating voltage and complete machine is the technological difficulties in this device design.Being widely used in the large enterprise of oil, chemical industry, metallurgy, the production of electric power equicontinuity and the motor of unattended equipment such as deep-well, oil field oil production machine restarts.

Description of drawings

Fig. 1 is a structural principle block diagram of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

Fig. 3 is that motor is restarted control flow chart.

Embodiment

Be described with reference to the accompanying drawings structure of the present utility model.

A kind of motor decompression Restarter, the structural principle block diagram as shown in Figure 1, power supply inserts single-chip microcomputer, voltage transformer signal output part summation current transformer signal output part is connected in the signal input part on the single-chip microcomputer, on single-chip microcomputer, be provided with real-time clock, the signal I/O and the led display unit of operation keyboard are connected on the single-chip microcomputer, and single-chip microcomputer is provided with the control relay signaling interface.

The working power of motor decompression Restarter adopts the duplicate supply pattern, its circuit design has higher specification requirement: will satisfy when electric network power-fail on the one hand, the backup battery continued power is arranged, require the quality of power supply will satisfy the operate as normal requirement of single-chip microcomputer on the other hand, need power filter function preferably.

Sampling section is by single-chip microcomputer the real-time sampling of line voltage to be detected to realize, adopts the AC sampling mode here.

The motor test section mainly is to adopt photoelectric isolation technology, by remote signalling state-detection electric network power-fail situation, but the normal opened contact of incoming transport contactor or normally closed contact, no specific (special) requirements.

Control relay partly is used for the control signal of microcomputer output is amplified, and directly drives the A.C. contactor of on-the-spot motor main circuit, plays an on-off action, is on the hazard at motor, when breaking down, realizes the protection to motor.

The LED display interface is used for the display operation state, the related parameter of debugging and adjusted.Restart controller and provide the good man-machine interaction interface for the user.Take into account the requirement of miniaturization Design, its circuit is made of three touch key-presss and three charactrons.Three buttons are designed to the function conversion key respectively, add/subtract key, acknowledgement key.The LED display interface possesses the electric permission time of rolling, restarts the setting of delay time, low voltage set value, recovery voltage set point and the functions such as demonstration of current voltage/current value.

The concrete connecting relation and the function of said apparatus are: Fig. 2 is the partial circuit figure of decompression Restarter based on the sampling and the relay control of dsPIC6014 single-chip microcomputer, the dsPIC6014 type single-chip microcomputer of MicroChip company, its operating voltage range is wide, all can operate as normal under 2.5V～5.5V DC; Compared with similar products, have superior low power capabilities and high speed flash memory technology, the speed of service is up to 30MIPS, 24 bit wide instructions buses and 16 bit wide data/address buss, the flash memory program space on the sheet of maximum 144K bytes, this single-chip microcomputer also has extremely strong electromagnetism antijamming capability simultaneously.The output of the VREF+ of single-chip microcomputer dsPIC6014 and AVDD connection MC7805 obtains reference power supply and the power supply of 5V, and the MC7805 input voltage is the 12V of power module output, and its output voltage is given single-chip microcomputer dsPIC6014 power supply behind the C11 capacitor filtering.The oscillation source of dsPIC6014 single-chip microcomputer is provided by the outside, connects the 4M crystal oscillator at its OSC1 and OSC2 pin, and the clock frequency of dsPIC6014 single-chip microcomputer work is provided, and series capacitance C9, C10 reduce temperature drift.Electric current in the electrical network obtains exchanging the analog sampling signal with voltage signal through current transformer and voltage transformer, through 2 input pins that comprise the TLC2264 operational amplifier of four tunnel amplifiers respectively, conversion of signals is after 100 Europe electric resistance partial pressures, the wide region sine wave of formation standard, and the AD converting unit module that enters single-chip microcomputer dsPIC6014, A, B, the C three-phase voltage signal connects AD channel AN3 respectively, AN5, AN7, A, B, the C three-phase current signal connects AD channel AN4, AN6, AN8, in addition for accurate slotted line voltage, A phase voltage sampled signal is inputed to AN9, remedy the error of the line voltage U ca that the sampling interval causes.Meanwhile, the A phase voltage signal that sampling obtains forms square-wave signal through amplifier and LM385, enter the input capture passage RD8 of dsPIC6014 single-chip microcomputer, obtain the terminal periodic of mains frequency and dsPIC6014 single-chip microcomputer sampling, and judge electric power signal sinusoidal wave period with this, as the foundation in dsPIC6014 single-chip microcomputer sampling period.The signal that obtains of sampling calculate the actual measured value of electric weight such as can obtaining voltage, electric current, power in dsPIC6014 single-chip microcomputer inside.Control loop partly adopts the PA1a-5V relay, its public termination 5V high level, and control end connects control signal respectively; 5 tunnel control signals produce the control level signal by 9 common IO pin RG12, RG14, RD2, RD3, RA14, RA15, RC13, RC14, the RD13 of dsPIC6014 single-chip microcomputer, for disconnecting relay output and other chip, prevent that outside forceful electric power from entering the misoperation in measurement and control loop and the control procedure, with control level signal one group of access door circuit 74HC86 in twos, again the output signal that obtains is driven back control relay output by module MC1413, finish the controlled function of this device.

The working procedure of motor decompression Restarter is to restart control flow chart by Fig. 3 motor to carry out.Carrying out the motor service conditions in the enabling signal input single-chip microcomputer differentiates; enter the motor working procedure after determining; in the motor voltage detecting of carrying out in service; when detection voltage is lower than lower limit set value; enter the o-volt protection operation program; enter the decompression self-starting and judge the entry condition program; enter the decompression self-starting respectively and judge voltage program and decompression self-starting judgement time program; the decompression that the laggard entry loop voltage of judgement voltage returns to setting is restarted the value program; program enters disconnected device pulsewidth and restarts the setting-up time program greater than decompression behind the judgement time; after finishing, both enter no outside No starting signal determining program; if there is not outside No starting signal; program is returned the motor working procedure, if outside No starting signal is arranged then program is returned the enabling signal program.The main criterion of control flow is when electric motor state changes, real-time and accurately to the measurement of system works voltage, here adopted quick AC sampling principle, can finish the one-shot measurement conversion in each cycle 20ms time, can satisfy the actual needs of native system fully at electrical network.

When " rolling " takes place in electrical network; the on-the-spot motor that is moving is shut down because of " rolling ", in the permission time, after line voltage recovers normally again; device is restarted the motor that requirement is restarted by predefined order automatically in batches, thereby the assurance production process is carried out continuously.Surpass the permissible value of setting as voltage fluctuation or break period, then automatic blocking is restarted program, because at this moment self-starting is meaningless again, even can cause accident.This device is the microelectronics integrated technology, contains independently working power and reserve emergency power supply, therefore is not subjected to the influence of externally fed power-supply fluctuation.The relay construction of employing standard is carried out man-to-man decentralized control, and operational environment is not had specific (special) requirements.

Change the conventional art compound mode, and substitute, strengthen versatility with the standardization industrial products; The increase of novelty is power autonomous, reduces the potential safety hazard and the investment that bring because of external power supply; Realize decentralized control, many hidden danger that the team control of avoiding all rising brings; Advanced electronics integrated technology strengthens reliability, avoids misoperation; The unique circuit design guarantees fail safe, and avoiding influences the original motor operate as normal because of inserting the Motor Control loop.

Device is monitoring line voltage and motoring in real time.Work as power network fluctuation, on-the-spot operation motor is shut down because of power network fluctuation, and in the permission time, electrical network is restarted by predefined order after recovering normally again automatically in batches.If voltage fluctuation or break period surpass permissible value, then the automatic blocking auto-programming to avoid accident.

Claims (1)

1. motor decompression Restarter, it is characterized in that: single-chip microcomputer dsPIC6014 power supply is provided by the output of MC7805, and the MC7805 input connects the 12V power module outlet; It is clock frequency that the OSC1 of single-chip microcomputer dsPIC6014 and OSC2 pin connect the 4M crystal oscillator; The current transformer that connects electrical network exchanges the analog sampling signal output part with voltage transformer, through 2 input pins that comprise the TLC2264 operational amplifier of four tunnel amplifiers respectively, the AD converting unit module that connects single-chip microcomputer dsPIC6014, A, B, C three-phase voltage signal output connects AD channel AN3 respectively, AN5, AN7, A, B, C three-phase current signal output connects AD channel AN4, AN6, AN8, A phase voltage sampled signal output connects the input that AD channel AN9 connects discharge circuit and LM385 simultaneously, and discharge circuit and LM385 output form the input capture passage RD8 that square-wave signal enters single-chip microcomputer dsPIC6014; Control loop adopts the PA1a-5V relay, its common port connects the 5V high level, the control level signal output part of 9 IO pin RG12 of single-chip microcomputer dsPIC6014, RG14, RD2, RD3, RA14, RA15, RC13, RC14, RD13 in twos one group connect input into gate circuit 74HC86, gate circuit 74HC86 input dome module MC1413 signal input part, module MC1413 signal output part connect drive controlling relay input.

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