CN203590110U - Six-phase AC motor frequency conversion speed adjusting device - Google Patents
Six-phase AC motor frequency conversion speed adjusting device Download PDFInfo
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- CN203590110U CN203590110U CN201320743489.2U CN201320743489U CN203590110U CN 203590110 U CN203590110 U CN 203590110U CN 201320743489 U CN201320743489 U CN 201320743489U CN 203590110 U CN203590110 U CN 203590110U
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Abstract
The utility model discloses a six-phase AC motor frequency conversion speed adjusting device. The device overcomes problems that the conventional frequency converter is complicated in control, high in cost, and limited in power-saving effects. The device comprises a three-phase rectifier bridge, a DC voltage regulator, a compensation capacitor, a control loop and a six-phase motor. Each pair of six pairs of common thyristors, TI and T8, T3 and T10, T5 and T12, T7 and T2, T9 and T4, T11 and T6, are in series connection at the same direction. The six pairs of thyristors are connected to form six bridge arms. Six output terminals, c1, b2, a1, c2, b1 and a2, successively led out from the middle points of the six bridge arms, form a six-phase inverter that is triggered and controlled in a six-beat manner with successive pi/2 and flow passage 2/3 pi electric angle. The six-phase inverter is respectively in parallel connection with two ends of six windings, Wa1, Wb2, Wc1, Wa2, Wb2 and Wc2, and then leads out six wiring terminals, a3, b4, c3, a4, b3 and c4, in connection with the input end of the adjuster. The device is suitable for speed regulation within a 30%-to-100% rated rotating speed range of medium- and large-scale asynchronous motors.
Description
Technical field
The present invention relates to motor and electric actuator, be specially a kind of six cross streams motor variable-frequency speed-regulating devices.
Background technology
Existing ac variable speed technology, main employing can be turn-offed power electronic device and be formed the inverter in parallel with feedback rectifier, and control its break-make and switching successively fast with the pulse width modulation mode of high frequency, thereby carry out the speed governing of three-phase alternating-current motor with the relation of constant voltage-frequency ratio.The rotating magnetic field of asynchronous motor and air-gap flux thereof produce with alternating current, adopt the switching mode of three phase inverter bridge and six beats thereof can more easily change its frequency, but the reactive current of its motor certainly will cause larger reactive loss via feedback rectifier to power supply feedback, and also the quick break-make by its turn-off device causes certain harmonic loss.Asynchronous machine adopts the stator winding mode of connection of three-phase, there is and distribution system comparatively easy advantage corresponding with existing three-phase alternating-current supply, but when controlling with three-phase alternating current frequency converter, because the electrical degree that its every beat shifts must be carried out feedback via feedback rectifier compared with large its perceptual power that makes, therefore there is certain waste of energy and the inadequate problem of capacity motor utilization.The non feedback type AC frequency conversion apparatus for asynchronous motor of Chinese patent 200810079371.8, adopt three phase inverter bridge and the combination of three-phase capacitor bridge, and the stator winding of threephase asynchronous is connected in to the circuit structure between Liang Geqiao road, having formed capacitor carries out capacitor with the switching of inverter bridge and fills, the unsteady flow process of electric discharge, to reducing the reactive loss of motor, there is certain effect, and utilize the feature that capacitor can oppositely be exerted pressure to inverter after current over-zero to carry out the change of current and the shutoff of triode thyristor, but there is the larger problem of circulation between the more complicated and capacitance bridge of circuit by the mode that three bidirectional thyristors are controlled auxiliary capacitor bridge.The stator winding of asynchronous motor is the heterogeneous winding construction close to circular potential phasor, and the feature that its inductive current can not suddenly change must cause its energy in switching to shift and the problem of reactive current feedback.Only has the angle that increases the number of phases of stator winding and reduce to switch, or inductance energy is transferred in capacitor, can effectively solve the problem that inductance current forms feedback and loss thereof, if the stator winding of asynchronous motor is changed over to the mode of connection of six phase potential phasors, and on its six terminals shunt capacitor, can utilize its switching mode of taking turns the formula of wandering to carry out the transfer gradually of electromagnetic energy, thereby carry out non-feedback inversion transformation in the inner wheel mode of wandering of gradual change and two kinds of electromagnetic energies.
Summary of the invention
The present invention, in order to solve inductance current and larger, the existing problem that Frequency Converter Control is more complicated Yu cost is higher and power savings is limited of loss of motor in AC frequency conversion, provides a kind of six cross streams motor variable-frequency speed-regulating devices.
The present invention adopts following technical scheme to realize:
Six cross streams motor variable-frequency speed-regulating devices, comprise three-phase commutation bridge, direct current voltage regulator, compensation condenser, control loop and six-phase motor, adopt T
1with T
8, T
3with T
10, T
5with T
12, T
7with T
2, T
9with T
4, T
11with T
6, six pairs between two the triode thyristor of series aiding connection connect into six brachium pontis, at each mid point of brachium pontis, draw successively c
1, b
2, a
1, c
2, b
1, a
2, six outputs and be combined into six phase inverters, and trigger control by six beat modes of lag behind successively π/3 and through-flow 2/3 π electrical degree; Described six-phase motor is its stator winding to be divided into six windings of Wa1 and Wa2, Wb1 and Wb2, Wc1 and tri-pairs of same potential phase places of Wc2 and identical umber of turn, by the loop of Wa1 end, Wb2 head end, Wc1 end, Wa2 head end, Wb1 end, Wc2 head end, being sequentially linked into its potential phasor is orthohexagonal combination wiring, and from its Wa1 head end is drawn a1, being connected of six windings, a little draw successively a
1, b
2, c
1, a
2, b
1, c
2, six terminals, and be connected in the output of six phase inverter bridge; Described compensation condenser is c
01with c
02, c
03with c
04, c
05with c
06, c
07with c
08, c
09with c
10, c
11with c
12, 12 power capacitors that capacity is equal, connect by series system between two, then correspondence is parallel to Wa1, Wb2, Wc1, Wa2, Wb1, six windings of Wc2 divide other two ends and draw successively a
3, b
4, c
3, a
4, b
3, c
4six terminals that are connected with adjuster input; Described adjuster is to be unified into Six-phase rectifier bridge with rectifier diode, and in its DC terminal, in the anodal mode of positive termination, connects one and turn-off only power electronic device T
02.
Further, the present invention's six cross streams motor variable-frequency speed-regulating technology, described compensation condenser C
01-C
02the rated voltage of 12 power capacitors phase voltage value that is six-phase motor, 12 capacitors be total capacity (KVAR) 1.2-2.4 that is motor rated power value (KW) doubly; The T of described direct current voltage reulation
01t with adjuster
02two turn-off power electronic device only adopts IGBT or GTO, and the triangular carrier that is 5-10KHz by frequency and adjustable DC reference voltage compare and turn-off device is carried out respectively to PWM control.
Operation principle of the present invention is: three phase worker power is through three-phase commutation bridge, then through T
01pipe becomes adjustable DC power supply, and the output frequency of its direct voltage amount and inverter keeps proportional relationship substantially, induced potential phasor is orthohexagonal six phase ac motors, the capacitor that connects respectively six groups of series connection at its six terminals, with it, on the one hand inductive coils is formed to compensation circuit in parallel, second aspect is carried out oppositely exerting pressure of moment with the thyristor of conducting to the thyristor that will turn-off and it is forced shutdown, the third aspect utilizes the filter action of capacitor to subdue the harmonic voltage in inversion switching, the interior compensating effect of series connection that fourth aspect utilizes neighboring capacitors to form effectively reduces leakage reactance pressure drop and the magnetic hysteresis loss of stator winding, the 5th aspect utilizes six group capacitors to make perception and two kinds of electromagnetic energies of capacitive carry out inner samsara and significantly reduce reactive loss to the interior compensating action of six-phase motor winding, by Six-phase rectifier bridge and T
02the adjuster that device forms, available easy pulse width modulation is to T
02device is controlled, increase with its conducting pulse duration, corresponding the reducing of magnitude of voltage at its rectifier bridge direct current two ends, the magnitude of voltage of each corresponding series capacitor increases to phase voltage value gradually from 1/2 phase voltage value, the variation of condenser voltage adapts to the variation of current of electric thus, and also for the six phase inverter bridge that adopt triode thyristor to form, carrying out unsteady flow switching provides prerequisite.
The present invention's six phase inverter bridge adopt six beat commutation modes, and in each 1/6 cycle that its six beat switches, the order of triggering and conducting thyristor is: T
1, T
2-T
1, T
2, T
3, T
4-T
3, T
4, T
5, T
6-T
5, T
6, T
7, T
8-T
7, T
8, T
9, T
10-T
9, T
10, T
11, T
12-T
11, T
12, T
1, T
2.In every beat (every step), only have 4 thyristor conductings and to carry out two-way through-flow, with the reverse voltage that conducting moment the electricity consumption container of adjacent thyristor forms, impel the thyristor of through-flow 2/3 π electrical degree to be forced shutdown.For example, at T
1, T
2, T
3, T
4during four thyristor triggering and conducting, W
a2with W
b1, W
b2with W
a1article two, series connection winding branch road is through-flow, and makes C
07, C
08, C
09, C
10, and C
04, C
03, C
02, C
01article two, capacitor's series branch road charge respectively (on just lower negative); Next 1/6 next week of initial beginning, T5 and T6 two thyristors are triggering and conducting simultaneously, C
03with C
04to T
3pipe through C
05with C
06capacitor is to T
1pipe applies voltage, C in the other direction
09with C
10to T
2pipe through C
11with C
12capacitor is to T
4pipe applies reverse voltage, because of T
1with T
2two pipes have lost trigger impulse, are placed under reverse current effect and turn-off, (T
3, T
4because there being trigger impulse, therefore conducting again) now circuit is by T
3, T
4, T
5, T
6four thyristors are to W
b1with W
c2, W
c1with W
b2article two, winding branch road provides electric current.This six phase inverter circuits only have utilize to connect with six phase windings on 12 capacitors and at integrated circuit during close to capacitive, could utilize the thyristor of transient switching reverse condenser voltage to be acted on to the thyristor that needs shutoff, capacitor is after this through corresponding winding loop electric discharge and with the mutual balance of the inductance current in winding.In switching in six phase inverter bridge with six beats, 12 beats, the voltage of 12 capacitors that connect each other is corresponding to be changed, and makes the alternating voltage effective value of capacitor close to the phase voltage value of winding in the variation increasing in adjuster pulsewidth.Six phase unsteady flows are preconditions of inductance energy generation gradual change, and eliminate with capacitor the reverse voltage producing when inductance suddenlys change, thereby have realized non-feedback inversion transformation in the unsteady flow of samsara formula.
Positive effect of the present invention is: in AC frequency conversion, carry out reactive power compensation simultaneously and energy-saving effect can be brought up to higher level, in suitable, the speed governing of large-sized asynchronous motor within the scope of 30%-100% rated speed, and have cost lower with the stronger advantage of practicality.
Accompanying drawing explanation
Fig. 1, circuit structure diagram of the present invention.
Embodiment
Case study on implementation 1
Six-Phase Asynchronous Motors of the present invention adopts common middle pressure or the asynchronous motor of low pressure to change a social system, and its stator and rotor iron core and shell all do not need to change, and only threephase stator winding are changed over to two group of three phase winding of phase voltage value (220 V).Specifically stator winding is divided into W
a1with W
a2, W
b1with W
b2, W
c1with W
c2three pairs with electromotive force phase place, each alternate 2/3 π electromotive force phase angle and six identical windings of winding configuration difference of differing respectively, by W
a1end, W
b2head end (use. represent), W
c1end, W
a2head end, W
b1end, W
c2head end is to W
a2it is orthohexagonal combination wiring that the loop order of end and direction are linked into its potential phasor, and from its W
a1the head end of winding is drawn a
1start, being connected of six windings, a little draw successively a
1, b
2, c
1, a
2, b
1, c
2six terminals, and be connected in the output of six phase inverter bridge; 12 compensation condensers be take between two as six branch roads that are connected into of a group, specifically by C
01with C
02, C
03with C
04, C
05with C
06, C
07with C
08, C
09with C
10, C
11with C
12series connection respectively, then correspondence is connected in c
2, a
1, b
2, c
1, a
2, b
1six terminals, and draw successively a at the mid point of each capacitor's series branch road
3, b
4, c
3, a
4, b
3, c
4six terminals that are connected with adjuster input; Adjuster, for the capacity regulating of capacitor, is specifically used D
7-D
18six pairs of rectifier diodes are unified into Six-phase rectifier bridge, and in the anodal mode of positive termination, connect an insulated gate bipolar thyristor (IGBT) T in two DC terminal
02, and compare and take out signal with triangular carrier (carrier frequency is 10KHz) and adjustable dc voltage, to T
02carry out pulse width modulation and the magnitude of voltage at adjuster direct current two ends is changed; Use D
1-D
6six common rectifier diodes connect into three-phase commutation bridge, and its three inputs are connected in to tri-power ends of A, B, C of three-phase alternating current power frequency, and the anode of its direct current output is through T
01igbt is connected with six phase inverter bridge, and 30%-100% rated DC current pressure-controlled is carried out in the direct current two ends of inverter bridge; T
01adopt PWM to control, specifically use the triangular carrier frequency of 10KHz with the comparison of adjustable dc voltage signal, to T
01the simple and easy modulation system that pipe equates with each pulsewidth is controlled break-make; Six phase inverter bridge are by T by 12 normal transistor (SCR)
1with T
8, T
3with T
10, T
5with T
12, T
7with T
2, T
9with T
4, T
11with T
6series aiding connection becomes a brachium pontis and the direct current two ends of six brachium pontis are connected form six phase inversion bridge circuit structures between two, and puts from T1 and T therein
8c is drawn in a beginning that is connected successively
1, b
2, a
1, c
2, b
1, a
2six outputs.
For C
01---C
01212 compensation condensers, adopt 220---the rated voltage of 250V, the total capacity KVAR of 12 power capacitors is 2.4 times (condenser voltage 220V) of six-phase motor rated power KW value, each rectifying tube, thyristor, 3-4 times of motor lines magnitudes of voltage routinely of load voltage value that can turn-off electronic device are selected, and its rated current is also by 3-4 times of selections.
The six phase inverter bridge of this example adopt six beats (six steps) transfer sequence to trigger control, the thyristor that utilizes next beat conducting forms reverse capacitance voltage Releasing loop and is forced shutdown conducting thyristor, and wherein the triggering and conducting of each thyristor is sequentially: T
1, T
2, T
3, T
4,-T
3, T
4, T
5, T
6-T
5, T
6, T
7, T
8-T
7, T
8, T
9, T
10-T
9, T
10, T
11, T
12-T
11, T
12, T
1, T
2.In every 1/6 through-flow cycle, have 4 thyristor conductings and to carry out two-way through-flow, each thyristor keeps the through-flow cycle of 2/3 π electrical degree.When electric motor starting, utilize the T of adjuster
02pipe makes the voltage effective value of each capacitor close to the phase voltage value of motor, improve equivalently respectively condenser capacity close to full conducting, with this, keeps motor and the overall load of capacitor close to capacitive, successfully with less electric current, to complete the start-up course of motor.In the process of the each transfer π/3 electromotive force phase angle forming at the through-flow thyristor of the switching of six beats, six-phase motor winding forms circular rotating magnetic potential, the inductance current of its winding and capacitance current carry out energy transmission and balance mutually, and produce larger energy-saving effect in this non-feedback inversion transformation mode.
Claims (2)
1. six cross streams motor variable-frequency speed-regulating devices, comprise three-phase commutation bridge, direct current voltage regulator, compensation condenser, control loop and six-phase motor, it is characterized in that, adopt T
1with T
8, T
3with T
10, T
5with T
12, T
7with T
2, T
9with T
4, T
11with T
6, six pairs between two the triode thyristor of series aiding connection connect into six brachium pontis, at each mid point of brachium pontis, draw successively c
1, b
2, a
1, c
2, b
1, a
2, six outputs and be combined into six phase inverters, and trigger control by six beat modes of lag behind successively π/3 and through-flow 2/3 π electrical degree; Described six-phase motor is its stator winding to be divided into six windings of Wa1 and Wa2, Wb1 and Wb2, Wc1 and tri-pairs of same potential phase places of Wc2 and identical umber of turn, by the loop of Wa1 end, Wb2 head end, Wc1 end, Wa2 head end, Wb1 end, Wc2 head end, being sequentially linked into its potential phasor is orthohexagonal combination wiring, and from its Wa1 head end is drawn a1, being connected of six windings, a little draw successively a
1, b
2, c
1, a
2, b
1, c
2, six terminals, and be connected in the output of six phase inverter bridge; Described compensation condenser is c
01with c
02, c
03with c
04, c
05with c
06, c
07with c
08, c
09with c
10, c
11with c
12, 12 power capacitors that capacity is equal, connect by series system between two, then correspondence is parallel to Wa1, Wb2, Wc1, Wa2, Wb1, six windings of Wc2 divide other two ends and draw successively a
3, b
4, c
3, a
4, b
3, c
4six terminals that are connected with adjuster input; Described adjuster is to be unified into Six-phase rectifier bridge with rectifier diode, and in its DC terminal, in the anodal mode of positive termination, connects one and turn-off only power electronic device T
02.
2. a kind of six cross streams motor variable-frequency speed-regulating devices according to claim 1, is characterized in that described compensation condenser (C
01-C
02) the rated voltage of 12 power capacitors phase voltage value that is six-phase motor, 12 capacitors be total capacity KVAR be motor rated power value KW 1.2-2.4 doubly; The T of described direct current voltage reulation
01t with adjuster
02two turn-off power electronic device only adopts IGBT or GTO, and the triangular carrier that is 5-10KHz by frequency and adjustable DC reference voltage compare and turn-off device is carried out respectively to PWM control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320743489.2U CN203590110U (en) | 2013-11-23 | 2013-11-23 | Six-phase AC motor frequency conversion speed adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320743489.2U CN203590110U (en) | 2013-11-23 | 2013-11-23 | Six-phase AC motor frequency conversion speed adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203590110U true CN203590110U (en) | 2014-05-07 |
Family
ID=50587957
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|---|---|---|---|
| CN201320743489.2U Expired - Fee Related CN203590110U (en) | 2013-11-23 | 2013-11-23 | Six-phase AC motor frequency conversion speed adjusting device |
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| Country | Link |
|---|---|
| CN (1) | CN203590110U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618490A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Variable-frequency speed regulation device of six-phase alternating-current motor |
-
2013
- 2013-11-23 CN CN201320743489.2U patent/CN203590110U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618490A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Variable-frequency speed regulation device of six-phase alternating-current motor |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20181123 |