CN2143028Y - Electronic program control electricity-saving protector for AC electric motor - Google Patents
Electronic program control electricity-saving protector for AC electric motor Download PDFInfo
- Publication number
- CN2143028Y CN2143028Y CN 92235114 CN92235114U CN2143028Y CN 2143028 Y CN2143028 Y CN 2143028Y CN 92235114 CN92235114 CN 92235114 CN 92235114 U CN92235114 U CN 92235114U CN 2143028 Y CN2143028 Y CN 2143028Y
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- China
- Prior art keywords
- motor
- circuit
- voltage
- control
- control circuit
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- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a control device for the electricity saving and the protection of an ac electric motor, which can trace the change of the quality of the loading of an electric motor, automatically adjust voltage on an electric motor winding, control that the voltage of the winding obliquely rises to full voltage in scheduled time through analogue signal, realize the soft start of the electric motor and realize that the speed of the electric motor is increased to rated speed. The Y/ delta conversion is carried out when load approaches to full load; the turning moment of the electric motor can be improved; the utility model also has the functions of protection for overpressure and long pressure, open phase and overload protection. The structure is simple, the power consumption is low, the making is easy, the cost is low, the work is stable and reliable, and the effect on electricity saving is conspicuous.
Description
The utility model relates to the automatic control of motor power saving and protection, particularly a kind of electronic program control device.
Alternating current motor is the widest in the industrial and mining enterprises; the equipment that power consumption is maximum; people do a lot of work to the power-saving running and the employing safeguard measure aspect of motor; basically all be for overcoming " low load with strong power " work that makes a search; reach the purpose of economize on electricity; present electric motor saver and protector are various in style; but they are insufficiency often; on technical scheme more ignorance voltage fluctuation to electric efficiency so the influence of power factor (PF); protector and electricity-saving appliance are well-separated designs; or power savings is undesirable, is 92212564 as the disclosed application number of Chinese patent.3 motor power saving protectors, though it comprehensively is protector and electricity-saving appliance an one, its power savings is unsatisfactory, its power-saving measures just with a kind of single mode of Y/ △ conversion, can not change with motor load, regulates on a large scale.
The purpose of this utility model provides a kind ofly can control soft starter for motor, is in operation automatically to the motor current-limiting pressure regulation and has the electronic program formula alternating current motor electricity-saving protection device of defencive function.
The utility model is finished with following mode: electronic program formula alternating current motor electricity-saving protection device includes power supply, voltage detecting circuit (2), load current detection circuit (1), electric motor protecting control circuit (4).The delay circuit control bistable trigger IC that soft starter for motor control circuit (7) is made up of resistance R, capacitor C
2Upset, output single-pole double-throw switch (SPDT) make the oblique ascension straightway voltage signal of capacitor C charging through switch SW
2Output is with the follower IC of this output signal through motor operation economize on electricity control circuit (6)
1-4Behind the light-coupled isolation amplifying circuit, the bidirectional triode thyristor KS of control motor pressure regulation executive circuit (8) regulates the motor working voltage; Motor operation economize on electricity control circuit (6) is through analog switch SW
1Accept the output signal of motor current signal testing circuit (1), realize that the tracking motor load current changes, and control motor pressure regulation executive circuit (8), analog switch SW
1Be controlled by bistable trigger IC
2Through the output signal of inverter I, Y/ △ conversion control circuit (5) is accepted the output signal of current signal detection circuit (1) after comparator and time-delay, control relay J
1Action; with its contact control electric motor protecting control circuit (4); realize the Y/ △ conversion of control motor operation, overvoltage, under-voltage protection control circuit (3) are accepted the voltage signal of voltage detection circuit (2), by the potentiometer W on two resistance series connection bleeder circuits
4W
5Centre cap reflects overvoltage, under-voltage signal respectively, behind comparator, and control relay J
2Action, with its contact control electric motor protecting control circuit (4), realize motor overvoltage, under-voltage protection.Overvoltage, under-voltage protection control circuit (3) repeat circuit J
2Normal opened contact J
2-3Be attempted by the two ends of the slope generation capacitor C in the soft starter for motor control loop (7), normal opened contact J
2-1Be attempted by the two ends of the shunt capacitance C of comparator output terminal in the T/ △ conversion control circuit (5), prepare for motor restarts.Relay J in overvoltage, the under-voltage protection control circuit (3)
2Be by triode BG
2Promote, at triode BG
2Base stage and be connected to shunt capacitance C
8Play time-lag action.
The utility model can be followed the tracks of the operating voltage on the variation self-regulation motor winding of load size when alternating current motor sky, light running, when motor near full load, motor windings is switched to delta connection by the star connection automatically, to improve the torque-carrying load ability of motor.When electric motor starting, at the fixed time in control motor windings voltage ramp to the soft start that full voltage is realized motor with linearity, make motor smoothly accelerate to rated speed.From the step-down current-limited startup to following the tracks of the pressure regulation operation, and load when increasing Y/ △ be converted to Automatic Control, the utility model also has overvoltage, under-voltage overload, phase failure protection function simultaneously.Have simple in structure, function is complete, power savings is remarkable, is applicable to the economize on electricity and the protection operation of all kinds of alternating current motors.
Fig. 1 is the utility model circuit block diagram
Fig. 2 is the utility model circuit theory diagrams
Below in conjunction with accompanying drawing the utility model is described in further detail:
As shown in Figure 1; the utility model is by motor current signal testing circuit (1), voltage signal testing circuit (2); overvoltage, under-voltage protection control circuit (3); electric motor protecting control circuit (4) Y/ △ conversion control circuit (5), motor operation economize on electricity control circuit (6), soft starter for motor control circuit (7), motor pressure regulation executive circuit (8) constitute.As shown in Figure 2, motor current signal testing circuit (1) is by the current transformer B that is serially connected with in the motor B phase circuit
1Output is through diode D
1-D
4Input to follower IC behind the rectification circuit
1-1And IC
1-2, A point output in Fig. 2.Voltage signal testing circuit (2) is by the single-phase potential transformer B that is connected to A, B phase
2Step-down is through diode D
11-D
14Output dc voltage signal behind the rectification circuit.Motor overvoltage, under-voltage protecting circuit (3) are by comparator IC
4Output control triode BG
2Conducting with end, thereby make relay J
2Whether move IC
4Adopt the NE555 integrated circuit, IC
4Input 2 pin connect by resistance R
16Adjustable resistance W
4Resistance R
17The series connection bleeder circuit that constitutes connects the output dc voltage signal of voltage signal testing circuit (2), at adjustable resistance W
4Meet triode BG on the upper end
6Collector electrode adjustable resistance W
5Regulate dividing potential drop and give triode BG
6Base stage, regulate adjustable resistance W
4Make when the supply voltage lower limit IC
42 pin voltages reduce to 1/2, the 3 pin output high level of 5 pin, make triode BG
2Turn-on relay J
2Action, its normally closed contact J
2-2Disconnect, the contactor QC coil blackout in the electric motor protecting control circuit (4), motor is cut off the electricity supply, at this moment LED
2Bright.Regulate adjustable resistance W
5Make when supply voltage surpasses higher limit triode BG
6Conducting makes IC
42 pin input voltages reduce relay J
2Action, contactor Q
CCut off motor power, power supply when normal value, IC
43 pin output low levels, LED
1Bright, LED
2Go out, voltage-stabiliser tube DW is as reference voltage, resistance R
12Be balance resistance and relay J
2The coil resistance is identical, capacitor C
8Be shunt capacitance, play time-lag action, can make relay J
2Action message, or can prevent that supply voltage transient voltage, overvoltage from causing protection misoperation soft starter for motor control circuit (7), pressing electric motor control contactor Q
CAfter, the motor energized is by rectification triode D
11-D
14Provide direct current Ec with voltage stabilizing circuit 7812, direct current E
CThrough resistance R
9To capacitor C
6Charging, bistable trigger IC
22 pin moment low levels, make IC
23 pin output high level, control analog switch SW
2Conducting, and, make analog switch SW through inverter I output low level
1End, power supply Ec is through adjustable resistance W simultaneously
3To capacitor C
7Charging, capacitor C
7Charging oblique ascension straightway voltage signal through SW
2Output control motor operation economize on electricity control circuit (6), this circuit (6) is by follower IC
1-4Through three utmost point BG
6Amplify, divide three tunnel outputs through triode BG through two optocoupler amplifier tube G of three serial connections again
3-BG
5After the amplification, trigger the bidirectional triode thyristor KS that is serially connected in the motor main circuit and control its angle of flow, trigger current is followed capacitor C
7The variation of last charging voltage oblique ascension is increased gradually by little, thereby the voltage that is added on the motor windings is risen in time gradually, realizes the soft start of motor, and its slope is by adjustable resistance W
3Regulate W
6Regulate lowest starting voltage.Work as IC
26 pin by capacitor C
7Provide voltage signal to rise to and equal 5 pin reference voltages, when promptly motor reaches rated speed, IC
2Upset, its 3 pin output transfers low level rapidly to by high level, realizes that motor is from starting to the switching of operation.IC
23 pin output low levels, make SW
2End, and, make SW through inverter I output high level
1Conducting, the voltage signal that the reflection current of electric of current signal detection circuit (1) output changes is through analog switch SW
1Output control motor operation economize on electricity control circuit (6) changes the conducting degree of bidirectional triode thyristor KS, makes the motor working voltage follow the tracks of the load size and lifting makes motor keep best power-saving running state.When motor near full load, also be the A point voltage V of current signal detection circuit (1) output
AWhen being raised to certain value, Y/ △ conversion control circuit (5) is accepted V
ASignal is through comparator IC
1-3Upset, the output high level is through R
7, C
5Time-delay makes triode BG
1Conducting, and relay J
1Adhesive, its contact J
1Make contactor Q
CYDischarge, and Q
C △Adhesive.As shown in Figure 2, motor windings then changes delta connection into by the Y connection, improves working voltage
Doubly, behind the load reduction, comparator IC then
1-3Output low level, triode BG
1End relay J
1Discharge motor and then recover Y connection automatic Regulation running status, reach motor pressure regulation operation, economize on electricity.In capacitor C
7And C
5On respectively and be connected to relay J
2Normal opened contact J
2-3And J
2-1Its effect is that the closure by contact makes capacitor C after the protection action
7And C
5Voltage short circuit discharge, guarantee that motor can restart rapidly, the utility model adopts light-coupled isolation pipe G, diode D
5, D
6, D
7, D
8And shunt capacitance C
3C
7, C
9, C
11, make each amplifier control circuit not be subjected to the interference of self-induced e.m.f and instantaneous high frequency in the executive circuit, high pressure, improve its reliability and stability.The overload protection utilization heat device RJ that continues, the power supply open phase protection is to use contactor Q
CControl circuit connect A, C phase, power transformer is serially connected with B and realizes mutually.Bidirectional triode thyristor KS is serially connected in Q
CYBetween contact and the three-phase neutral point.Utilize a plurality of taps of current transformer secondary winding and suitable each adjustable resistance W in the regulating circuit
1-W
4, can make a product be applicable to the motor of several difference in functionality power, improve the flexibility of its use.
Claims (3)
1, a kind of electronic program formula alternating current motor electricity-saving protection device, it comprises voltage detection circuit (2) load current detection circuit (1), electric motor protecting control circuit (4), it is characterized in that:
The oblique ascension straightway voltage signal that the delay circuit control capacitance C that soft starter for motor control circuit (7) is made up of the resistance R capacitor C charges is through switch SW
2Output is with the follower IC of this output signal through motor operation economize on electricity control circuit (6)
1-4Behind the light-coupled isolation amplifying circuit, the bidirectional triode thyristor KS of control motor pressure regulation executive circuit (8) regulates motor windings voltage, behind the electric motor starting, and bistable IC
2Upset, control is by analog switch SW
1SW
2And the single-pole double-throw switch (SPDT) of inverter I composition, realize by the conversion that starts to operation.
Motor power saving running control circuit (6) is through analog switch SW
1Accept the output signal of motor current signal testing circuit (1), realize that the tracking motor load current changes and control motor pressure regulation executive circuit (8),
Y/ Δ conversion control circuit (5) is accepted the output signal of current signal detection circuit (1) through comparator IC
1-3And R
7, C
5After the time-delay, control relay J
1Action, realize the Y/ Δ conversion of control motor operation with its contact;
Overvoltage, under-voltage protection control circuit (3) are accepted the voltage signal of voltage signal testing circuit (2), by the potentiometer W on two resistance series connection bleeder circuits
4, W
5Centre cap reflect overvoltage, under-voltage signal respectively, control relay J behind comparator
2Action, with its contact J
2-2Cut off electric motor protecting control circuit (4), realize motor overvoltage, under-voltage protection.
2, according to the described electricity-saving protection device of claim 1, it is characterized in that: overvoltage, under-voltage protection control circuit (3) repeat circuit J
2Normal opened contact J
2-3Be attempted by the two ends of the slope generation capacitor C in the soft starter for motor control circuit (7), normal opened contact J
2-1Be attempted by the two ends of the shunt capacitance C of comparator output terminal in the Y/ △ conversion control circuit (5).For restarting, motor prepares.
3,, it is characterized in that the relay J in overvoltage, the under-voltage protection control circuit (3) according to the described electricity-saving protection device of claim 1
2Be by triode BG
2Promote, at triode BG
2Base stage and be connected to shunt capacitance C
8Play time-lag action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92235114 CN2143028Y (en) | 1992-10-20 | 1992-10-20 | Electronic program control electricity-saving protector for AC electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92235114 CN2143028Y (en) | 1992-10-20 | 1992-10-20 | Electronic program control electricity-saving protector for AC electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2143028Y true CN2143028Y (en) | 1993-09-29 |
Family
ID=33776971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92235114 Expired - Fee Related CN2143028Y (en) | 1992-10-20 | 1992-10-20 | Electronic program control electricity-saving protector for AC electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2143028Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570965A (en) * | 2012-02-24 | 2012-07-11 | 江苏煌明能源科技有限公司 | Program control energy-saving device of motor |
| CN106066223A (en) * | 2016-06-30 | 2016-11-02 | 天津市津达执行器有限公司 | A kind of moment Acquisition Circuit of YE |
| CN110844094A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Double-channel aviation digital power supply control method |
| CN114563995A (en) * | 2022-01-17 | 2022-05-31 | 潍柴动力股份有限公司 | Reset detection method, device and equipment of electronic control unit and storage medium |
-
1992
- 1992-10-20 CN CN 92235114 patent/CN2143028Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570965A (en) * | 2012-02-24 | 2012-07-11 | 江苏煌明能源科技有限公司 | Program control energy-saving device of motor |
| CN102570965B (en) * | 2012-02-24 | 2014-03-19 | 江苏煌明能源科技有限公司 | Program control energy-saving device of motor |
| CN106066223A (en) * | 2016-06-30 | 2016-11-02 | 天津市津达执行器有限公司 | A kind of moment Acquisition Circuit of YE |
| CN110844094A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Double-channel aviation digital power supply control method |
| CN110844094B (en) * | 2019-10-25 | 2022-10-11 | 天津航空机电有限公司 | Double-channel aviation digital power supply control method |
| CN114563995A (en) * | 2022-01-17 | 2022-05-31 | 潍柴动力股份有限公司 | Reset detection method, device and equipment of electronic control unit and storage medium |
| CN114563995B (en) * | 2022-01-17 | 2024-03-19 | 潍柴动力股份有限公司 | Reset detection method, device, equipment and storage medium of electronic control unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |