CN102510247A - Sensing motor star corner soft startup control method based on controlled silicon and device thereof - Google Patents
Sensing motor star corner soft startup control method based on controlled silicon and device thereof Download PDFInfo
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- CN102510247A CN102510247A CN2011103703170A CN201110370317A CN102510247A CN 102510247 A CN102510247 A CN 102510247A CN 2011103703170 A CN2011103703170 A CN 2011103703170A CN 201110370317 A CN201110370317 A CN 201110370317A CN 102510247 A CN102510247 A CN 102510247A
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Abstract
The invention relates to a sensing motor star corner soft startup control method based on controlled silicon and a device thereof, which belong to the technical field of motors and motion control. In a sensing motor star corner startup control process, motor three-phase winding star connection soft input is first carried out so that current impact in a motor startup process is eliminated; then star connection is maintained to a stable state again and stator winding star connection is softly switched to stator winding corner connection at an appropriate switching point so that current and torque impact in the motor star corner switching is eliminated; finally corner connection operation is maintained to enter the stable state again so that the soft startup of this type of motor with limited current and limited torque is realized. The device comprises a voltage detection unit, a single-chip microcomputer control unit, a star connection soft input switch, a star corner soft switch, other elements of a main circuit, and wires. The invention has the advantages that: smooth transition is realized in the three-phase stator winding star corner soft startup process, current and torque impact is suppressed, high-order harmonic wave, noise and vibration are eliminated, and simultaneously, the easy operability of star corner soft startup is ensured.
Description
Technical field
The invention belongs to motor and motion control field, be specifically related to a kind of based on silicon controlled induction motor star angle control of soft method and device.
Background technology
The induction motor start mode has AC voltage adjusting soft start and the soft start of classification AC/AC (alternating current) variable-frequency of across-the-line starting, star angle reduced voltage starting, rotor loop crosstalk resistance or the starting of string frequency sensitive trheostat, liquid resistance soft start, magnetic controlled soft starter, thyristor etc.; The AC voltage adjusting soft start of its culminant star angle reduced voltage starting and thyristor is fairly simple effective start mode; But star angle reduced voltage starting has also reduced locked-rotor torque when reducing starting current; Only be applicable to zero load or light start operating mode; And the AC voltage adjusting soft start of thyristor realizes soft start with microelectronics through thyristor, yet the high order harmonic component that is caused by thyristor is also comparatively serious; Other start modes also all have shortcoming more or less, and the meeting that has produces big electric current, and the meeting that has has brought extra loss, have in addition also can produce vibration.
The angle starting method of induction motor star is a kind of reduced voltage starting mode that simply is prone to realization; Adopt star-like connection at preliminary stage motor winding; Starting converts angle type connection into up to the steady operation state after surpassing critical whirling speed; The starting stage star connects starting can reduce starting current, avoids the excessive impact to electrical network of motor starting electric current.
Traditional star angle starting device connects contactor through the Single-chip Controlling star and the conducting of corner connection contactor realizes that with turn-offing the contactor arc light was prone to cause short circuit, fail safe and poor reliability when switched at starting moment and star angle; A solution is to replace contactor with controllable silicon, the electric arc that can avoid the contact to cause, if but controllable silicon is not effectively triggered control, still can not eliminate the transient impact electric current that moment is switched at starting initial instant and star angle.
Summary of the invention
The present invention adopts a kind of based on silicon controlled induction motor star angle control of soft method and device; Can overcome the shortcoming of angle starting method of traditional star and starting device; Adopt contactless Arc-free reverse-blocking tetrode thyristor; Through different phase seamlessly transitting of realization motor magnetic linkage controlled in the series triggering of controllable silicon enforcement, the rush of current in the time of can reducing starting current and suppress the starting process culminant star to connect starting moment and the switching of star angle, thereby the star angle soft start of realization motor.This soft start is simple in structure, and maintenance workload is little, and is multiple functional, can also reduce influence of harmonic, the vibration of noise when reducing electric motor starting and elimination motor.
Provided by the invention based on silicon controlled induction motor star angle control of soft method; In the star angle of induction motor starting control procedure; Carry out motor three phase winding stars earlier and connect soft input, eliminate the rush of current in the motor starting procedure, keep star to connect again and move to stable state; Connect soft handover to the stator winding corner connection at suitable switching point by the stator winding star then; Eliminate electric current and torque shock ends in the switching of motor star angle, keep corner connection to move at last and get into stable state once more, thereby realize the current limliting of this type motor and the Soft Start-up Process of limit torque.Concrete steps are (referring to Fig. 2 and Fig. 3) as follows:
Step 1, preliminary stage closed star earlier meet contactor KM2;
Step 3 keeps motor to be in complete star and connects starting state;
Step 4, single-chip microcomputer judge whether the revolutional slip of motor (judges s＜s less than breakdown slip
c), if " denying " returned step 3, if " being " execution in step 5;
Step 5 is turn-offed the triggering that star connects controllable silicon SCR 2;
Step 6 is broken off star and is met contactor KM2, closed corner connection contactor KM1;
Step 7, through to SCR1 three-phase controllable silicon carry out series and trigger the star angle soft handover that control realizes motor: with α
D0Be the initial trigger angle, make the sequential turn-on of three-phase according to V1U2, W1V2-U1W2, V1U2, W1V2-U1W2, V1U2-U1W2, V1U2, W1V2-U1W2, W1V2-U1W2, V1U2, W1V2-, during progressively adjust trigger angle from α
1To α
9, make magnetic linkage control arrive the pairing size of corner connection winding voltage (380V), the complete conducting of ABC three-phase behind 5 cycles is not all smoothly had electric current and torque and is carried out the transition to stable state with impacting;
Step 8, keep motor be in complete corner connection starting state up to the star angle proceed-to-send.
The invention still further relates to a kind of induction motor star angle control of soft device, comprise that voltage detection unit, Single-chip Controlling unit, star connect soft input switch, star angle Single Switch of Soft Switching, other elements of main circuit and wiring.Voltage detection unit is gathered power supply voltage signal, offers the Single-chip Controlling unit as triggering the control foundation; Give an order and connect soft input switch to star in the Single-chip Controlling unit, control element is wherein carried out star and connect soft input operation; Give an order to star angle Single Switch of Soft Switching in the Single-chip Controlling unit, control element is wherein carried out star angle operating in soft handover; Star connects soft input switch and is connected with controlled motor is star-like, and star angle Single Switch of Soft Switching is connected with controlled motor angle type; Other elements of main circuit are connected power supply and by all components and parts between the controlled motor and the wiring of secondary control loop thereof with wiring.
Voltage detection unit: constitute by voltage transformer and modulate circuit thereof, be used for gathering in real time the motor voltage parameter.
The Single-chip Controlling unit: the Single-chip Controlling unit comprises singlechip chip, A/D converter spare and contactor drive circuit and controllable silicon trigger control circuit.Singlechip chip can adopt any general-purpose chip more than 8 as core; A/D converter spare changes into the treatable digital signal of singlechip chip with the detected voltage analog signal of voltage detection unit; Closed or the disconnection contactor of singlechip chip control contactor drive circuit; Singlechip chip control thyristor gating circuit triggering and conducting or shutoff controllable silicon.
Star connects soft input switch: be composed in series with contactor KM2 by controllable silicon SCR 2, be linked to be wye connection with three-phase stator winding.
Star angle Single Switch of Soft Switching: be composed in series with contactor KM1 by controllable silicon SCR 1, be linked to be the angle type with three-phase stator winding and connect method.
Other elements of main circuit and wiring: comprise be connected power supply and by the air switch QF of controlled motor and and star connect all connecting lines between soft input switch and the star angle Single Switch of Soft Switching, also comprise the wiring of device secondary control loop.
Beneficial effect of the present invention: the present invention adopts induction motor star angle control of soft method; Utilize contactless Arc-free controllable silicon; Trigger control through series and realize the transition smoothly in the Soft Start-up Process of threephase stator winding star angle of motor magnetic linkage; Thereby suppressed electric current and torque shock ends in the Soft Start-up Process of star angle, eliminated high order harmonic component, noise and vibration in the soft start of star angle, also guaranteed the ease for operation of star angle soft start simultaneously.
Description of drawings
Fig. 1 is a control device sketch map of the present invention.
Fig. 2 is an induction motor star of the present invention angle control of soft device main circuit diagram, and wherein KM1 and KM2 are contactors, U1-U2; V1-V2; W1-W2 is respectively the three-phase stator winding connector lug of motor, and contactor KM1 connects with SCR1, is connected with motor winding formation angle type (to make U1 and V2 again; V1 and W2, W1 links to each other with U2); Contactor KM2 connects with silicon controlled module SCR2, further forms star-like the connection with the motor winding.
Fig. 3 is a control method flow chart of the present invention.
Embodiment
Do further explain through the accompanying drawing specific embodiments of the invention below.
The basic skills of star angle soft start is: through the circuits for triggering of machine controllable silicon; Trigger according to the soft start trigger policy; Controllable silicon is conducted and three alternately the modes of being conducted are implemented series and triggered control according to two; Progressively stator magnetic linkage is adjusted, reached three-phase conducting simultaneously at last, realize that successively motor stator winding star connects soft input, keeps star to connect moving to stable state, connects soft handover at suitable switching point by the stator winding star and move to and get into stable state once more to stator winding corner connection, maintenance corner connection; Thereby realize the star angle soft start overall process of motor, the impulse current of stator side when having reduced motor starting.
With reference to control device sketch map of the present invention (as shown in Figure 1).The control device main circuit is connected with motor, and voltage transformer detects the voltage of mains side.Voltage signal through modulate circuit become-10V-+10V between.Convert thereof into digital quantity through AD converter and be transferred to single-chip microcomputer.Single-chip microcomputer accurate Calculation voltage U
BCThe peak point of signal sends drive signal as benchmark.Wherein drive the silicon controlled signal and isolate through photoelectricity earlier, form trigger impulse through pulse generation circuit then, and then the conducting of control controllable silicon SCR 1 and SCR2; And the signal of driving contactor is isolated through photoelectricity, realizes the closed and shutoff of contactor KM1 and KM2 through the coil that drives relay.
With reference to shown in Figure 2, be divided into for two steps on the whole based on silicon controlled induction motor winding star angle control of soft method:
The first step, induction motor are carried out the stator winding star and are connect soft input.At this moment, SCR1 is triggering and conducting not, and KM1 breaks off.Closed KM2 triggers the conducting of control realization SCR2 then through the series of the soft input of SCR2 earlier, begins to carry out the stator winding star and connects soft input.Star connects soft input with α
Y0For the initial trigger angle SCR2 is implemented series and triggers control, make the sequential turn-on of three-phase according to BC-ABC-CA-ABC-AB-ABC-, during progressively adjust trigger angle from α
1To α
n, in 5 cycles, realizing the soft input when the stator winding star connects, the complete conducting of three-phase this moment, electric current and torque do not carry out the transition to stable state with all smoothly having impact, keep motor to be in complete star and connect running status.
The step that concrete series triggers control method is following:
Step X1: BC phase thyristor is at U among the Group of Silicon Controlled Rectifier SCR2
BCPeak point is the delay-angle α of benchmark
Y0Begin to trigger;
Step X2: B mutually with C controllable silicon electric current I mutually
BAnd I
CNot before the zero passage, with U
BCPeak point is the delay-angle α of benchmark
1AAs third phase A conducting trigger angle;
Step X3: close naturally in C phase current zero passage and to have no progeny, motor is in the AB conducting state.With U
ABPeak point is the delay-angle α of benchmark
1CAs C phase trigger angle, C is conducted, motor gets into the three-phase conducting state again;
Step X4: close naturally in B phase current zero passage and to have no progeny, motor is in the CA conducting state.With U
CAPeak point is the delay-angle α of benchmark
1BAs B phase trigger angle, B is conducted, motor gets into the three-phase conducting state again;
Step X5: at following half cycle with U
BC, U
ABAnd U
CANegative peak point be the trigger angle α of benchmark
2A, α
2CAnd α
2BTo A, C and B mutually controllable silicon carry out conducting, realize that motor two is conducted and three alternating states that are conducted in half cycle;
Step X6: the given one group of new trigger angle of each half-wave, repeat above-mentioned steps.
Step X7: set and stop trigger angle α
9, the soft input when completion stator winding star connects in 5 cycles.In second step, induction motor carries out stator winding star angle soft handover.When single-chip microcomputer is judged s＞s
c(s
cBe breakdown slip, i.e. the corresponding revolutional slip of maximum electrical magnetic torque), motor carries out connecing soft handover to corner connection from star; This moment, KM1 broke off; Closed KM1, SCR1 triggers the conducting of controlling realization self through the series of star angle soft handover, and single-chip microcomputer detects power line voltage U
BCPeak point after, the time-delay α
D0Angle begins that SCR1 is implemented series and triggers control; Make the sequential turn-on of three-phase according to V1U2, W1V2-U1W2, V1U2, W1V2-U1W2, V1U2-U1W2, V1U2, W1V2-U1W2, W1V2-U1W2, V1U2, W1V2-, during progressively adjust trigger angle from α
1To α
9, make magnetic linkage control arrive the pairing size of corner connection winding voltage (380V), the final complete conducting of three-phase makes electric current and torque not carry out the transition to stable state with all smoothly having impact, the maintenance motor be in complete corner connection running status up to the star angle proceed-to-send.
It is similar that the concrete triggering control strategy and the star of star angle soft handover connects soft input, is concrete controllable silicon series trigger angle difference, and star meets the initial trigger angle α of soft input
Y0Span is 30 °～60 °; The initial trigger angle α of star angle soft handover
D0Span is 60 °～90 °.
Through based on silicon controlled induction motor star angle control of soft method and control device; Can realize the angle soft start of motor star; Reduce the rush of current of motor stator winding in the reduced voltage starting process of star angle well, eliminated the problems such as high order harmonic component, noise and vibration in the soft starts such as thyristor interchange pressure regulation.
Claims (7)
1. one kind based on silicon controlled induction motor star angle control of soft method, it is characterized in that concrete steps are following:
(1) the closed star of preliminary stage elder generation meets contactor KM2;
(2) carry out series triggering control through three-phase controllable silicon and realize that the star of motor connects soft input: with α to SCR2
Y0Be initial trigger angle triggering and conducting BC two phases, per afterwards half cycle is progressively adjusted trigger angle from α
1To α
9, make the sequential turn-on of three-phase according to ABC-CA-ABC-AB-ABC-BC-, in 5 cycles, accomplish the adjustment of trigger angle, the final complete conducting of ABC three-phase, electric current and torque do not carry out the transition to stable state with all smoothly having impact;
(3) keep motor to be in complete star and connect starting state;
(4) single-chip microcomputer judge motor revolutional slip whether less than breakdown slip, i.e. s＜s
cIf " deny " to return step (3), if " being " execution in step (5);
(5) turn-off the triggering that star connects controllable silicon SCR 2;
(6) break off star and meet contactor KM2, closed corner connection contactor KM1;
(7) through to SCR1 three-phase controllable silicon carry out series and trigger the star angle soft handover that control realizes motor: with α
D0Be the initial trigger angle, make the sequential turn-on of three-phase according to V1U2, W1V2-U1W2, V1U2, W1V2-U1W2, V1U2-U1W2, V1U2, W1V2-U1W2, W1V2-U1W2, V1U2, W1V2-, during progressively adjust trigger angle from α
1To α
9, make magnetic linkage control arrive the pairing size of corner connection winding voltage 380V, the complete conducting of ABC three-phase behind 5 cycles is not all smoothly had electric current and torque and is carried out the transition to stable state with impacting;
(8) keep motor be in complete corner connection starting state up to the star angle proceed-to-send.
One kind realize the said method of claim 1 based on silicon controlled induction motor star angle control of soft device; It is characterized in that, comprise that voltage detection unit, Single-chip Controlling unit, star connect soft input switch, star angle Single Switch of Soft Switching, other elements of main circuit and wiring; Voltage detection unit is gathered power supply voltage signal, offers the Single-chip Controlling unit as triggering the control foundation; Give an order and connect soft input switch to star in the Single-chip Controlling unit, control element is wherein carried out star and connect soft input operation; Give an order to star angle Single Switch of Soft Switching in the Single-chip Controlling unit, control element is wherein carried out star angle operating in soft handover; Star connects soft input switch and is connected with controlled motor is star-like, and star angle Single Switch of Soft Switching is connected with controlled motor angle type; Other elements of main circuit are connected power supply and by all components and parts between the controlled motor and the wiring of secondary control loop thereof with wiring.
3. device according to claim 2 is characterized in that described voltage detection unit is made up of voltage transformer and modulate circuit thereof, is used for gathering in real time the motor voltage parameter.
4. device according to claim 2 is characterized in that, described Single-chip Controlling unit comprises singlechip chip, A/D converter spare and contactor drive circuit and controllable silicon trigger control circuit.Singlechip chip can adopt any general-purpose chip more than 8 as core; A/D converter spare changes into the treatable digital signal of singlechip chip with the detected voltage analog signal of voltage detection unit; Closed or the disconnection contactor of singlechip chip control contactor drive circuit; Singlechip chip control thyristor gating circuit triggering and conducting or shutoff controllable silicon.
5. device according to claim 2 is characterized in that, described star connects soft input switch: be composed in series with contactor KM2 by controllable silicon SCR 2, be linked to be wye connection with three-phase stator winding.
6. device according to claim 2 is characterized in that, described star angle Single Switch of Soft Switching is composed in series with contactor KM1 by controllable silicon SCR 1, is linked to be the angle type with three-phase stator winding and connects method.
7. device according to claim 2; It is characterized in that; Other elements of described main circuit and wiring comprise be connected power supply and by the air switch QF of controlled motor and and star connect all connecting lines between soft input switch and the star angle Single Switch of Soft Switching, also comprise the wiring of device secondary control loop.
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|---|---|---|---|
| CN2011103703170A CN102510247A (en) | 2011-11-18 | 2011-11-18 | Sensing motor star corner soft startup control method based on controlled silicon and device thereof |
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|---|---|---|---|
| CN2011103703170A CN102510247A (en) | 2011-11-18 | 2011-11-18 | Sensing motor star corner soft startup control method based on controlled silicon and device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452199A (en) * | 2016-10-20 | 2017-02-22 | 渤海大学 | Three-phase induction motor star-delta starter and starting method thereof |
| WO2018078851A1 (en) * | 2016-10-31 | 2018-05-03 | 三菱電機株式会社 | Electric motor drive device |
| WO2019026257A1 (en) * | 2017-08-03 | 2019-02-07 | 三菱電機株式会社 | Electric motor system and outdoor unit equipped with electric motor system |
| CN113300658A (en) * | 2020-02-21 | 2021-08-24 | 北京六十六号互动科技有限公司 | Winding wiring state switching system of motor |
-
2011
- 2011-11-18 CN CN2011103703170A patent/CN102510247A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452199A (en) * | 2016-10-20 | 2017-02-22 | 渤海大学 | Three-phase induction motor star-delta starter and starting method thereof |
| CN106452199B (en) * | 2016-10-20 | 2019-01-25 | 渤海大学 | The starting method of three phase induction motor star angle starting device |
| WO2018078851A1 (en) * | 2016-10-31 | 2018-05-03 | 三菱電機株式会社 | Electric motor drive device |
| JPWO2018078851A1 (en) * | 2016-10-31 | 2019-06-24 | 三菱電機株式会社 | Motor drive |
| WO2019026257A1 (en) * | 2017-08-03 | 2019-02-07 | 三菱電機株式会社 | Electric motor system and outdoor unit equipped with electric motor system |
| CN113300658A (en) * | 2020-02-21 | 2021-08-24 | 北京六十六号互动科技有限公司 | Winding wiring state switching system of motor |
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Application publication date: 20120620 |