CN102570965A - Program control energy-saving device of motor - Google Patents
Program control energy-saving device of motor Download PDFInfo
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- CN102570965A CN102570965A CN2012100437033A CN201210043703A CN102570965A CN 102570965 A CN102570965 A CN 102570965A CN 2012100437033 A CN2012100437033 A CN 2012100437033A CN 201210043703 A CN201210043703 A CN 201210043703A CN 102570965 A CN102570965 A CN 102570965A
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Abstract
The invention provides a program control energy-saving device of a motor, and relates to the technical field of the control of the motor. The program control energy-saving device comprises a direct current (DC) power circuit, a load tracking circuit, a fault detecting circuit, an undervoltage compensating circuit and a motor control circuit, wherein the DC power circuit supplies voltages of 5V and 10V to the circuits, so that each circuit is guaranteed to run well; in the load tracking circuit, a current of the motor is monitored through a current transformer, so as to judge whether the motor is light loaded or fully loaded; three current transformers in the fault detecting circuit detects whether the problems of over current, phase failure, and the like occur or not; and a signal output terminal of the undervoltage compensating circuit is connected with an input terminal of the motor control circuit, and the motor control circuit controls a conduction angle of a silicon controlled rectifier through an optical coupler, so as to control the voltage of the motor. The DC power circuit supplies the voltages of 5V and 10V to the circuits, so that each circuit is guaranteed to run well.
Description
Technical field
The present invention relates to the system of the digging technical field of motor.
Background technology
Through retrieval, present electric motor energy-saving technique mainly is to carry out energy-conservationly through improving the start-up control mode, mainly contains following three kinds: 1, across-the-line starting mode, also cry direct-on-line starting.Through some across-the-line starting equipment, whole supply voltages directly are added to the stator winding of motor during starting, motor is started under rated voltage.2, traditional decompression starting mode.Decompression starting is the voltage that when starting, reduces earlier on the stator winding, after the starting, returns to rated value to voltage again.Common decompression starting has following four kinds: (1) star-delta (Y-△) starting, the anti-starting of (2) crosstalk, (3) auto-transformer starting, the starting of (4) extend-triangle.3, soft-start mode.Modern electronic type soft start equipment adopts the thyristor voltage regulation circuit, and this circuit composition situation is: six thyristors; Reverse parallel connection is connected in series on the three phase mains circuit of motor, after system sends enabled instruction in twos; The starter Control System of Microcomputer will be carried out data according to computing, makes the output thyristor send triggering signal, the angle of flow of control thyristor; According to the pattern of setting, regulate the voltage of output, reach the purpose of control motor starting.
The shortcoming of prior art:
1, the trigger circuit of across-the-line starting is the simplest, yet for the motor that needs Fraquent start, excessive starting current will cause the heating of motor, influence the life-span of motor; The motor winding can deform under electrodynamic effect simultaneously, possibly cause short circuit, and then burn motor; Excessive in addition starting current can make line drop increase, and causes the remarkable decline of line voltage, thereby influences the operate as normal of other equipment of same electrical network, sometimes even they are stopped or can't the bringing onto load starting.
Though 2, decompression starting can reduce starting current, starting torque also can reduce simultaneously.Therefore, the decompression starting method generally only is applicable to starting under underloading or the no-load condition.
3, soft start is owing to set a starting current that electrical network is not exerted an influence at prestart, and electric current is slowly to increase to the setting electric current, thus non-impact current, thus minimum to the influence of electrical network, and the impact of elimination starting torque.
Summary of the invention
To the defective of prior art, the object of the invention is to propose a kind of motor program controlled energy-saving device, and in order to reach purpose of energy saving, energy-saving appliance can reduce the no-load current of motor automatically with the voltage reduction of motor when empty load of motor.
Technical scheme of the present invention is: the present invention includes DC power supply circuit, load tracking circuit, failure detector circuit, under-voltage compensating circuit and circuit for controlling motor; DC power supply circuit is respectively load tracking circuit, failure detector circuit, under-voltage compensating circuit and circuit for controlling motor working power is provided; The termination motor power circuit two ends, source of the current transformer of load tracking circuit; The source end of three current transformers of failure detector circuit links to each other with three-phase alternating current respectively one by one; The signal output of under-voltage compensating circuit connects the input of circuit for controlling motor, and the three-phase output end of circuit for controlling motor connects an optocoupler respectively separately.
Among the present invention, DC power supply circuit is that circuit provides 5V and 12V voltage, guarantees that other each circuit well operate; In the load tracking circuit, thereby judge that through current transformer monitoring current of electric motor is a underloading or fully loaded; Three current transformers detect problems such as whether overcurrent, phase shortage are arranged appearance in the failure detector circuit; The signal output of under-voltage compensating circuit connects the input of circuit for controlling motor, and circuit for controlling motor is through the optocoupler control silicon controlled angle of flow, thus the control electric moter voltage.DC power supply circuit is that circuit provides 5V and 12V voltage, guarantees that other each circuit well operate.
The operation principle of energy saving motor of the present invention mainly is through the starting current of restrictions motor and according to the situation regulation voltage of load; It is energy-conservation that present electric motor saver generally adopts the starting current of soft starting mode restrictions motor to carry out, the loading condition real-time regulated voltage when still not moving according to motor.Reach purpose of energy saving, the present invention can reduce the no-load current of motor automatically with the voltage reduction of motor when empty load of motor.Can realize the mutual conversion of power save mode and full load condition, when when power save mode, adding heavy duty suddenly, the terminal voltage that can satisfy motor is raised to the requirement of total head, avoids the generation of overcurrent phenomenon.This electricity-saving appliance has electric motor protecting and warning function, and electric motor protecting comprises: thyristor protection, under-voltage protection, ground protection, open phase protection, overload protection and overcurrent protection.Have self diagnosis and self-recovering function simultaneously, can prevent that software from makeing mistakes to run to fly that it is reliable to work, and can effectively prevent the change of the initial setting that staff's misoperation causes.
The present invention can be mated with various motors, and is widely applicable, convenient and safe.When starting, adopt soft starting mode, prolong electrical machinery life when saving electric energy.In the machine operation process, real-time tracking motor load, and adjustment motor operating voltage are saved electric energy to greatest extent; Failure detector circuit can effectively detect the various faults of motor circuit, in case fault takes place, auto power off guarantees that motor is not damaged; Under-voltage compensating circuit can effectively be adjusted motor operating voltage under the unsettled situation of motor power voltage, guarantees the motor operate as normal.Simultaneously, this intelligent electric machine electricity-saving appliance has the function of antisurge, reduces the injury that spread of voltage causes motor to greatest extent.
Load tracking circuit according to the invention mainly by single-chip microcomputer U1, current transformer TL1, high-frequency suppressing capacitor C 3, operational amplifier U4B, semifixed resistor R46, energy-saving indicating lamp LED1, indicator light LED2, rectifier diode D5 and electrolytic capacitor filter C12 be set form; Two elementary inputs of current transformer T1 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4B; Operational amplifier U4B is an inverting amplifier; The ac voltage signal end that the output of operational amplifier U4B is amplified connects rectifier diode D5, in the output connection high-frequency suppressing capacitor C 3 of rectifier diode D5; The two ends of semifixed resistor R46 are connected in parallel on the two ends of high-frequency suppressing capacitor C 3, and the adjustable side of semifixed resistor R46 connects the GP4 end of single-chip microcomputer U1; Energy-saving indicating lamp LED1 with indicator light LED2 is connected single-chip microcomputer U1 respectively through divider resistance output is set.
Direct current after semifixed resistor R46 will amplify converts direct voltage to; Operational amplifier U4B (LM358) is connected into inverting amplifier; When motor is started working; The ac voltage signal input operational amplifier U4B (LM358) of induction amplifies, and the ac voltage signal that operational amplifier U4B output is amplified is through rectifier diode D5 rectification; 3 filtering of high-frequency suppressing capacitor C connect the GP4 end sample port part of single-chip microcomputer U1 with ac voltage signal average out to dc level signal.When being provided with, it is bright until indicator light LED2 is set to regulate semifixed resistor R46, and ideal position is adjusted in expression; Single-chip microcomputer sampling judges if motor is a underloading, then regulates electric moter voltage and carries out energy-conservationly, and this moment, energy-saving indicating lamp LED1 was bright.
Failure detector circuit according to the invention comprises single-chip microcomputer U2, three current transformer TL2, TL3, TL4, voltage sampling resistor R28, R29, R30, rectifier diode D8, D9, D11, filter capacitor C4, C6, C7 and fault alarm indicator light D13; Two inputs of three current transformer TL2, TL3, TL4 are connected to the three-phase input end of motor working current; Three current transformer TL2, TL3, the secondary of TL4 are connected with voltage sampling resistor R28, R29, R30 respectively; Be connected in parallel on the two ends of voltage sampling resistor R28 after rectifier diode D8 and the filter capacitor C4 series connection; Be connected in parallel on the two ends of voltage sampling resistor R29 after rectifier diode D9 and the filter capacitor C6 series connection; Be connected in parallel on the two ends of voltage sampling resistor R30 after rectifier diode D11 and the filter capacitor C7 series connection, the negative pole end of rectifier diode D8, D9, D11 is connected with GP1, GP2, the GP4 end of single-chip microcomputer U2 respectively; Fault alarm indicator light D13 is connected the output of single-chip microcomputer U2.
The Vcc end of single-chip microcomputer U2 is connected the output of 5V three terminal regulator SWDZ1; The GP1 of single-chip microcomputer U2, GP2, GP4 end are respectively the induction dc level signal sampling input of motor three-phase alternating current; This single-chip microcomputer uses built-in 4M crystal oscillator, the electrification reset port of R43, C22 series connection single-chip microcomputer GP3, and D13 is the fault alarm indicator light; Indicator light extinguishes when motor runs well, and indicator light is bright when faults such as phase shortage, overcurrent occurring.
The under-voltage compensating circuit of the present invention comprises single-chip microcomputer U3, voltage transformer T2, operational amplifier U4A, rectifier diode D10, electrolytic capacitor filter C5 and under-voltage indicator light D14; Two elementary inputs of current transformer T2 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4A; The ac voltage signal end that operational amplifier U4A output is amplified connects the positive terminal of rectifier diode D10; Connect the GP4 end sample port of electrolytic capacitor filter C5 and single-chip microcomputer U3 respectively at the negative pole end of rectifier diode D10, under-voltage indicator light D14 is connected the GP1 end of single-chip microcomputer U3.
When single-chip microcomputer U3 after over-sampling, computing, judgement, low as finding electric moter voltage, make the bright D14 of under-voltage indicator light, voltage compensation is carried out in control simultaneously.
Circuit for controlling motor according to the invention comprises photoelectrical coupler JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9, thyristor Q1, Q2, Q3, fully loaded indicator light D12, triode Q4, Q5, Q6, delay capacitor C9, C13, C14, piezo-resistance R8, R23, R24, current-limiting resistance R31, R32, R2 and filter capacitor C10, C15, C16; The output of DC power supply circuit is respectively through corresponding respectively 1 pin that meets photoelectrical coupler JP3, JP2, JP1 of current-limiting resistance R31, R32, R2; 2 pin of photoelectrical coupler JP3, JP2, JP1 connect 1 pin of photoelectrical coupler JP4, JP8, JP5 respectively; Wherein connect fully loaded indicator light D12 between 1 pin of 2 pin of photoelectrical coupler JP1 and photoelectrical coupler JP5,1 pin of photoelectrical coupler JP4, JP8, JP5 connects 1 pin of photoelectrical coupler JP9, JP7, JP6 respectively; The grounded emitter of triode Q4, Q5, Q6, the collector electrode of triode Q4, Q5, Q6 link to each other with 2 pin of photoelectrical coupler JP6, JP7, JP9 respectively; The anode of thyristor Q1, Q2, Q3 connects 6 pin of photoelectrical coupler JP3, JP4, JP9 respectively; The negative electrode of thyristor Q1 connects 4 pin of JP3 through delay capacitor C9 and resistance R 5, and the negative electrode of thyristor Q2 connects 4 pin of JP4 through delay capacitor C13 and resistance R 17, and the negative electrode of thyristor Q3 connects 4 pin of JP9 through delay capacitor C14 and resistance R 18; Two ends at thyristor Q1, Q2, Q3 meet piezo-resistance R8, R23, R24 respectively; Filter capacitor C10 is connected to the two ends of thyristor Q1 with after resistance R 9 links to each other, and filter capacitor C15 is connected to the two ends of thyristor Q2 with after resistance R 25 links to each other, and filter capacitor C16 is connected to the two ends of thyristor Q3 respectively with after resistance R 26 links to each other.
Photoelectrical coupler signal one-way transmission, photoelectrical coupler input and output have been realized electrical isolation fully, and the output signal does not have influence to input, and antijamming capability is strong, working stability; Thyristor can carry out controlled rectification, when motor load changes, passes through the on-off of control triode Q4 when the load tracking circuit monitoring and controls thyristor, just can change current of electric.Equally, failure detector circuit detects fault and takes place then to break off triode Q6, and thyristor quits work, and guarantees motor safety; When under-voltage compensating circuit finds that circuit is under-voltage, regulate and compensate through the on-off of control triode Q5.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is DC power supply circuit schematic diagram among the present invention;
Fig. 4 is load tracking circuit theory diagrams among the present invention;
Fig. 5 is failure detector circuit schematic diagram among the present invention;
Fig. 6 is under-voltage compensating circuit schematic diagram among the present invention;
Fig. 7 is circuit for controlling motor schematic diagram among the present invention.
Embodiment
As shown in Figure 1, the present invention is provided with load tracking circuit 1, failure detector circuit 2, under-voltage compensating circuit 3, circuit for controlling motor 4 and is the DC power supply circuit 5 that each above circuit provides working power.
As shown in Figure 2, the termination motor power circuit two ends, source of the current transformer of load tracking circuit 1, thus monitoring current of electric judgement motor is a underloading or fully loaded; The source end of three current transformers of failure detector circuit 2 links to each other with three-phase alternating current respectively one by one, detects problems such as whether overcurrent, phase shortage are arranged and occurs; The signal output of under-voltage compensating circuit 3 connects the input of circuit for controlling motor, and the three-phase output end of circuit for controlling motor 4 connects an optocoupler respectively separately, and circuit for controlling motor is through the optocoupler control silicon controlled angle of flow, thus the control electric moter voltage.DC power supply circuit 5 guarantees that for each circuit provides 5V and 12V voltage other each circuit well operate.
As shown in Figure 3; The rectifier bridge that the 12V DC power-supply circuit is made up of transformer T1, diode D1-D4,12V voltage-stabiliser tube DW1 and electrolytic capacitor filter C1 form; Two inputs of transformer T1 are connected with the AC-input voltage two ends; Two outputs of transformer T1 connect two inputs of rectifier bridge, and 12V voltage-stabiliser tube DW1 is connected two outputs of rectifier bridge, and electrolytic capacitor filter C1 is connected in parallel on the two ends of 12V voltage-stabiliser tube DW1.The 5V DC power-supply circuit is on 12V DC power-supply circuit basis, to adopt three terminal regulator SWDZ1 to produce.The 12V power supply connects three terminal regulator SWDZ1 input, and electrolytic capacitor filter C2, C8 are connected between three terminal regulator SWDZ1 and the ground.DC power supply circuit is that subsequent conditioning circuit provides the low voltage operating power supply.
As shown in Figure 4, the load tracking circuit mainly by PIC12F675 single-chip microcomputer U1, current transformer TL1, high-frequency suppressing capacitor C 3, LM358 operational amplifier U4B, semifixed resistor R46, energy-saving indicating lamp LED1, indicator light LED2, rectifier diode D5 and electrolytic capacitor filter C12 be set form.
Two elementary inputs of current transformer T1 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4B; Operational amplifier U4B is an inverting amplifier; The ac voltage signal end that the output of operational amplifier U4B is amplified connects rectifier diode D5, in the output connection high-frequency suppressing capacitor C 3 of rectifier diode D5; The two ends of semifixed resistor R46 are connected in parallel on the two ends of high-frequency suppressing capacitor C 3, and the adjustable side of semifixed resistor R46 connects the GP4 end of single-chip microcomputer U1; Energy-saving indicating lamp LED1 with indicator light LED2 is connected single-chip microcomputer U1 respectively through divider resistance output is set.
When being provided with, it is bright until indicator light LED2 to regulate R46, and ideal position is adjusted in expression; Single-chip microcomputer sampling judges if motor is a underloading, then regulates electric moter voltage and carries out energy-conservationly, and this moment, LED1 such as energy-conservation knowledge was bright.
As shown in Figure 5, failure detector circuit comprises PIC12F675 single-chip microcomputer U2, three current transformer TL2, TL3, TL4, voltage sampling resistor R28, R29, R30, rectifier diode D8, D9, D11, filter capacitor C4, C6, C7 and fault alarm indicator light D13.
The Vcc end of PIC12F675 single-chip microcomputer U2 is connected the output of 5V three terminal regulator SWDZ1; Two inputs of three current transformer TL2, TL3, TL4 are connected to the three-phase input end of motor working current; Three current transformer TL2, TL3, the secondary of TL4 are connected with voltage sampling resistor R28, R29, R30 respectively; Be connected in parallel on the two ends of voltage sampling resistor R28 after rectifier diode D8 and the filter capacitor C4 series connection; Be connected in parallel on the two ends of voltage sampling resistor R29 after rectifier diode D9 and the filter capacitor C6 series connection; Be connected in parallel on the two ends of voltage sampling resistor R30 after rectifier diode D11 and the filter capacitor C7 series connection, the negative pole end of rectifier diode D8, D9, D11 is connected with GP1, GP2, the GP4 end of single-chip microcomputer U2 respectively; Fault alarm indicator light D13 is connected the output of single-chip microcomputer U2.
The GP1 of PIC12F675 single-chip microcomputer U2, GP2, GP4 end are the induction dc level signal sampling input of motor three-phase alternating current; This single-chip microcomputer uses built-in 4M crystal oscillator; The electrification reset port of R43, C22 series connection single-chip microcomputer GP3; D13 is the fault alarm indicator light, and indicator light extinguishes when motor runs well, and indicator light is bright when faults such as phase shortage, overcurrent occurring.
As shown in Figure 6, under-voltage compensating circuit comprises PIC12F675 single-chip microcomputer U3, voltage transformer T2, UA741 operational amplifier U4A, rectifier diode D10, electrolytic capacitor filter C5 and under-voltage indicator light D14.
Two elementary inputs of current transformer T2 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4A; The ac voltage signal end that operational amplifier U4A output is amplified connects the positive terminal of rectifier diode D10; Connect the GP4 end sample port of electrolytic capacitor filter C5 and single-chip microcomputer U3 respectively at the negative pole end of rectifier diode D10, under-voltage indicator light D14 is connected the GP1 end of single-chip microcomputer U3.
Two elementary inputs of current transformer T2 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4A; The ac voltage signal end that operational amplifier U4A output is amplified connects rectifier diode D10; Output at rectifier diode D10 connects electrolytic capacitor filter C5, is connected to the GP4 end sample port part of single-chip microcomputer U3 then, when single-chip microcomputer finds that after over-sampling, computing, judgement electric moter voltage is low; Under-voltage indicator light is bright, and voltage compensation is carried out in control simultaneously.Resistance R 36 is used for the electric energy of capacitor C 5 for discharging resistance.
As shown in Figure 7; Said circuit for controlling motor comprises photoelectrical coupler JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9, thyristor Q1, Q2, Q3, fully loaded indicator light D12, triode Q4, Q5, Q6, delay capacitor C9, C13, C14, piezo-resistance R8, R23, R24, current-limiting resistance R31, R32, R2 and filter capacitor C10, C15, C16; At the output of 12V DC power supply VCC1 respectively through corresponding respectively 1 pin that meets photoelectrical coupler JP3, JP2, JP1 of current-limiting resistance R31, R32, R2; 2 pin of photoelectrical coupler JP3, JP2, JP1 connect 1 pin of photoelectrical coupler JP4, JP8, JP5 respectively; Wherein connect fully loaded indicator light D12 between 1 pin of 2 pin of photoelectrical coupler JP1 and photoelectrical coupler JP5,1 pin of photoelectrical coupler JP4, JP8, JP5 connects 1 pin of photoelectrical coupler JP9, JP7, JP6 respectively; The grounded emitter of triode Q4, Q5, Q6, the collector electrode of triode Q4, Q5, Q6 link to each other with 2 pin of photoelectrical coupler JP6, JP7, JP9 respectively; The anode of thyristor Q1, Q2, Q3 connects 6 pin of photoelectrical coupler JP3, JP4, JP9 respectively; The negative electrode of thyristor Q1 connects 4 pin of JP3 through delay capacitor C9 and resistance R 5, and the negative electrode of thyristor Q2 connects 4 pin of JP4 through delay capacitor C13 and resistance R 17, and the negative electrode of thyristor Q3 connects 4 pin of JP9 through delay capacitor C14 and resistance R 18; Two ends at thyristor Q1, Q2, Q3 meet piezo-resistance R8, R23, R24 respectively; Filter capacitor C10 is connected to the two ends of thyristor Q1 with after resistance R 9 links to each other, and filter capacitor C15 is connected to the two ends of thyristor Q2 with after resistance R 25 links to each other, and filter capacitor C16 is connected to the two ends of thyristor Q3 respectively with after resistance R 26 links to each other.
Photoelectrical coupler signal one-way transmission, input and output have been realized electrical isolation fully, and the output signal does not have influence to input, and antijamming capability is strong, working stability; Thyristor can carry out controlled rectification, when motor load changes, passes through the on-off of control triode Q4 when the load tracking circuit monitoring and controls thyristor, just can change current of electric.Equally, failure detector circuit detects fault and takes place then to break off triode Q6, and thyristor quits work, and guarantees motor safety; When under-voltage compensating circuit finds that circuit is under-voltage, regulate and compensate through the on-off of control triode Q5.
Among the present invention; When the DC level that samples motor working current when single-chip microcomputer in the load tracking circuit is higher than set point; Explain that motor is fully loaded, single-chip microcomputer GP1 pin output high level is through the base stage of resistance R 13 to triode Q4, triode Q4 conducting in the load tracking circuit; Circuit for controlling motor does not carry out step-down, the operation of motor total head; Otherwise; When the DC level that samples motor working current is lower than set point, the GP1 pin output low level of single-chip microcomputer in the load tracking circuit, triode Q4 ends; Circuit for controlling motor carries out reduced pressure operation; The motor brownout operation, thus reach the real-time tracking load, and the dynamic adjustments electric moter voltage is to electricity-saving state.Simultaneously, can intelligence mate various motors in the load tracking circuit, applied widely.Single-chip microcomputer GP0 pin output high level was connected to through resistance R 12 indicator light LED2 is set after intelligence was mated successfully, and it is bright that indicator light is set; During power save mode work, single-chip microcomputer GP5 pin is connected to energy-saving indicating lamp LED1 through resistance R 11, and energy-saving indicating lamp is bright.
When the single-chip microcomputer in the failure detector circuit samples voltage difference any two in GP1, GP2, three pin of GP4 above preset value; When perhaps finding that wherein a phase current is excessive and too small; Faults such as overcurrent, phase shortage or circuit breaker occur is described, single-chip microcomputer GP0 pin output low level is through the base stage of resistance R 38 to triode Q6, and triode Q6 ends; Optocoupler JP3, JP4, JP9 quit work in the circuit for controlling motor; Reach the function of automatic outage, thereby the control motor quits work, the protection motor safety.Simultaneously, when single-chip microcomputer detected the fault generation, single-chip microcomputer GP1 pin output high level was connected to fault alarm indicator light D14 through resistance R 45, and the fault alarm indicator light is bright.
Single-chip microcomputer in under-voltage compensating circuit samples the voltage signal of GP4 pin; When judging machine operation power voltage insufficient 380V, the single-chip microcomputer GP0 pin output high level in the under-voltage compensating circuit is through the base stage of resistance R 37 to triode Q5; Triode Q5 conducting; Optocoupler JP2 work compensates in the circuit for controlling motor, and the motor voltage is compensated to set point.
Among the present invention, when clicking light-load starting, through capacitor C 9, C13, the C14 power supply of delaying time, optocoupler JP1, JP2 do not work, and the angle of flow of thyristor is less, the motor reduced-voltage starting; During fully loaded the startup, the motor full voltage starting is not delayed time in optocoupler JP1 work.Piezo-resistance R8, R23, R24 withstand voltage are 470V, and automatic short-circuit when overtension has the function of antisurge, effectively protects thyristor and motor.
Claims (5)
1. motor program controlled energy-saving device is characterized in that: comprise DC power supply circuit, load tracking circuit, failure detector circuit, under-voltage compensating circuit and circuit for controlling motor; DC power supply circuit is respectively load tracking circuit, failure detector circuit, under-voltage compensating circuit and circuit for controlling motor working power is provided; The termination motor power circuit two ends, source of the current transformer of load tracking circuit; The source end of three current transformers of failure detector circuit links to each other with three-phase alternating current respectively one by one; The signal output of under-voltage compensating circuit connects the input of circuit for controlling motor, and the three-phase output end of circuit for controlling motor connects an optocoupler respectively separately.
2. according to the said motor program controlled energy-saving of claim 1 device, it is characterized in that: said load tracking circuit mainly by single-chip microcomputer U1, current transformer TL1, high-frequency suppressing capacitor C 3, operational amplifier U4B, semifixed resistor R46, energy-saving indicating lamp LED1, indicator light LED2, rectifier diode D5 and electrolytic capacitor filter C12 be set form; Two elementary inputs of current transformer T1 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4B; Operational amplifier U4B is an inverting amplifier; The ac voltage signal end that the output of operational amplifier U4B is amplified connects rectifier diode D5, in the output connection high-frequency suppressing capacitor C 3 of rectifier diode D5; The two ends of semifixed resistor R46 are connected in parallel on the two ends of high-frequency suppressing capacitor C 3, and the adjustable side of semifixed resistor R46 connects the GP4 end of single-chip microcomputer U1; Energy-saving indicating lamp LED1 with indicator light LED2 is connected single-chip microcomputer U1 respectively through divider resistance output is set.
3. according to the said motor program controlled energy-saving of claim 1 device, it is characterized in that: said failure detector circuit comprises single-chip microcomputer U2, three current transformer TL2, TL3, TL4, voltage sampling resistor R28, R29, R30, rectifier diode D8, D9, D11, filter capacitor C4, C6, C7 and fault alarm indicator light D13; Two inputs of three current transformer TL2, TL3, TL4 are connected to the three-phase input end of motor working current; Three current transformer TL2, TL3, the secondary of TL4 are connected with voltage sampling resistor R28, R29, R30 respectively; Be connected in parallel on the two ends of voltage sampling resistor R28 after rectifier diode D8 and the filter capacitor C4 series connection; Be connected in parallel on the two ends of voltage sampling resistor R29 after rectifier diode D9 and the filter capacitor C6 series connection; Be connected in parallel on the two ends of voltage sampling resistor R30 after rectifier diode D11 and the filter capacitor C7 series connection, the negative pole end of rectifier diode D8, D9, D11 is connected with GP1, GP2, the GP4 end of single-chip microcomputer U2 respectively; Fault alarm indicator light D13 is connected the output of single-chip microcomputer U2.
4. according to the said motor program controlled energy-saving of claim 1 device, it is characterized in that: said under-voltage compensating circuit comprises single-chip microcomputer U3, voltage transformer T2, operational amplifier U4A, rectifier diode D10, electrolytic capacitor filter C5 and under-voltage indicator light D14; Two elementary inputs of current transformer T2 are connected on the motor working current; Secondaryly be connected respectively with in-phase end, the end of oppisite phase of operational amplifier U4A; The ac voltage signal end that operational amplifier U4A output is amplified connects the positive terminal of rectifier diode D10; Connect the GP4 end sample port of electrolytic capacitor filter C5 and single-chip microcomputer U3 respectively at the negative pole end of rectifier diode D10, under-voltage indicator light D14 is connected the GP1 end of single-chip microcomputer U3.
5. according to the said motor program controlled energy-saving of claim 1 device; It is characterized in that: said circuit for controlling motor comprises photoelectrical coupler JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9, thyristor Q1, Q2, Q3, fully loaded indicator light D12, triode Q4, Q5, Q6, delay capacitor C9, C13, C14, piezo-resistance R8, R23, R24, current-limiting resistance R31, R32, R2 and filter capacitor C10, C15, C16; The output of DC power supply circuit is respectively through corresponding respectively 1 pin that meets photoelectrical coupler JP3, JP2, JP1 of current-limiting resistance R31, R32, R2; 2 pin of photoelectrical coupler JP3, JP2, JP1 connect 1 pin of photoelectrical coupler JP4, JP8, JP5 respectively; Wherein connect fully loaded indicator light D12 between 1 pin of 2 pin of photoelectrical coupler JP1 and photoelectrical coupler JP5,1 pin of photoelectrical coupler JP4, JP8, JP5 connects 1 pin of photoelectrical coupler JP9, JP7, JP6 respectively; The grounded emitter of triode Q4, Q5, Q6, the collector electrode of triode Q4, Q5, Q6 link to each other with 2 pin of photoelectrical coupler JP6, JP7, JP9 respectively; The anode of thyristor Q1, Q2, Q3 connects 6 pin of photoelectrical coupler JP3, JP4, JP9 respectively; The negative electrode of thyristor Q1 connects 4 pin of JP3 through delay capacitor C9 and resistance R 5, and the negative electrode of thyristor Q2 connects 4 pin of JP4 through delay capacitor C13 and resistance R 17, and the negative electrode of thyristor Q3 connects 4 pin of JP9 through delay capacitor C14 and resistance R 18; Two ends at thyristor Q1, Q2, Q3 meet piezo-resistance R8, R23, R24 respectively; Filter capacitor C10 is connected to the two ends of thyristor Q1 with after resistance R 9 links to each other, and filter capacitor C15 is connected to the two ends of thyristor Q2 with after resistance R 25 links to each other, and filter capacitor C16 is connected to the two ends of thyristor Q3 respectively with after resistance R 26 links to each other.
Priority Applications (1)
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| CN201210043703.3A CN102570965B (en) | 2012-02-24 | 2012-02-24 | Program control energy-saving device of motor |
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| CN201210043703.3A CN102570965B (en) | 2012-02-24 | 2012-02-24 | Program control energy-saving device of motor |
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| CN102570965B CN102570965B (en) | 2014-03-19 |
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| CN102570965B (en) | 2014-03-19 |
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