CN203590121U - Capacitor compensation type asynchronous motor pressure-regulating speed-regulating device - Google Patents
Capacitor compensation type asynchronous motor pressure-regulating speed-regulating device Download PDFInfo
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- CN203590121U CN203590121U CN201320743486.9U CN201320743486U CN203590121U CN 203590121 U CN203590121 U CN 203590121U CN 201320743486 U CN201320743486 U CN 201320743486U CN 203590121 U CN203590121 U CN 203590121U
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Abstract
The utility model relates to a capacitor compensation type asynchronous motor pressure-regulating speed-regulating device. The device overcomes problems that a asynchronous motor is high in wattless loss and a thyristor pressure-regulating device is high in harmonic wave loss. The device comprises three-phase stator windings that are divided into a main winding group and an auxiliary winding group. Three-phase main windings include wa1, wb1 and wc1 and three-phase auxiliary windings include wa2, wb2 and wc2. The head ends of the corresponding phases of the main windings and the auxiliary windings are respectively connected to lead out three wiring terminals including A2, B2 and C2. The tail ends of the three main windings, wa1, wb1 and wc1, are successively connected with the three terminals, B1, C1, and A1. The tail ends of the three auxiliary windings, wa2, wb2 and wc2, are successively connected with the three terminals, B1, C1, and A1. The tail ends of the three auxiliary windings are successively in series connection with three capacitors, C01, C02 and C03, and then connected with the three terminals, C1, A1 and B1. The winding structures and number of turns are respectively equal between wa1 and wa2, between wb1 and wb2, and between wc1 and wc2. The difference in potential phase angles between each of the three winding pairs is 2/3 pi. The device enables simple speed regulation within a 50%-to-100% rated rotating speed range of motors of blowers and pumps.
Description
Technical field
The invention belongs to motor and electric drive ambit, be specifically related to a kind of device of capacitance compensation type asynchronous machine variable voltage control.
Background technology
In technical field of motors, the research of and reactive loss larger problem large to its starting current, can be described as and continued work for many years.The AC voltage regulator that adopts bidirectional thyristor to form, to the rotational speed regulation of blower fan, pump class motor or carry out so-called soft start, have advantages of that certain energy-saving effect and cost are lower, but the phase shift triggering mode that its thyristor must adopt to form the problem of wave distortion and harmonic loss.Adopting compensation technique in a kind of electric capacity, is a kind of good solution to the reactive loss of asynchronous motor.The interior compensation winding of the alternating current motor of Chinese patent 03145525.5 for example, adopt the mode of connection of hexagon and star pattern, and in the winding segments of π/3 voltage phase angle that relatively lags behind shunt capacitor, the winding of series relationship is carried out to shifting to leading direction of its electric current phasor, the capacitance current phasor splicing that the winding of relation in parallel is shifted to hysteresis direction, the power factor that produces motor with this is close to 1.0 energy-saving effect, has a strong impact on compensation effect in it but the inconvenience when large of its load variations at motor regulates in time.Existing AC frequency conversion equipment, have advantages of that speed adjustable range is wider and speed adjustable range precision is higher, but the asynchronous motor for a large amount of relatively high powers, only need simple and easy and less speed adjustable range need compensating its reactive power, therefore make this compared with the frequency conversion equipment of high cost, use at the scene also more limited.Manage to develop and a kind ofly there is capacitance compensation function and device that can speed governing within the scope of 50%-100% rated speed has its wide market prospects.
Summary of the invention
The object of the invention is, in order to solve the problem that reactive loss is large and thyristor voltage regulation equipment harmonic loss is larger of asynchronous motor, provides a kind of capacitor compensation type asynchronous machine pressure-speed regulating device.
The technical scheme that the present invention takes is for achieving the above object: comprise stator winding, alternating-current switch, capacitor and adjuster, threephase stator winding is divided into major and minor two groups of windings, the main winding w of three-phase
a1, w
b1, w
c1auxiliary winding w with three-phase
a2, w
b2, w
c2respectively the head end of major and minor two windings of homophase is connected and draws A
2, B
2, C
2three terminals, its three terminals are first through T
1, T
2, T
3three bidirectional thyristors of adjuster are to A
1, B
1, C
1three terminals, then through alternating-current switch K
1to A, B, tri-alternating current sources of C; Three main winding w
a1, w
b1, w
c1three ends be attached to successively B
1, C
1, A
1three terminals, or be attached to successively B
2, C
2, A
2three terminals, three auxiliary winding w
a2, w
b2, w
c2identical with the electromotive force phase place of identical main winding respectively, its winding end C that connects successively
01, C
02, C
03after capacitor, be attached to C
1, A
1, B
1three terminals, or series connection C
01, C
02, C
03after capacitor, be attached to C
2, A
2, B
2three terminals; Described w
a1with w
a2, w
b1with w
b2, w
c1with w
c2the main winding of three pairs of homophases and auxiliary winding, its winding construction and the number of turn are identical respectively, and the mutual electromotive force phase angle of each phase winding differs 2/3 π phase angle, draws altogether 9 binding posts after the main winding and auxiliary winding of its homophase divides other head end to be connected.
Further, three of described adjuster bidirectional thyristor T
1, T
2, T
3adopt phase shift firing control; Described capacitor C
01, C
02, C
03rated voltage and the rated voltage of the motor ratio that adopts 1-1.15:1, the numerical value ratio of the total capacity of three power capacitors and the rated power of motor is 0.4-0.65:1.
Operation principle of the present invention is: the major and minor double winding that the stator winding of threephase asynchronous is divided into magnetic circuit coupling, and in hysteresis transferase 12/3 π electrical degree mode, connect capacitor on auxiliary winding, at the inductance current of main winding, lagging behind, its voltage approaches π/6 angle and leading its voltage of condenser current is in the phasor relation of pi/2 angle, make the electric current phasor in main winding and auxiliary winding unanimously and jointly produce winding magnetic potential close to phase place, and utilize the voltage of capacitor to be controlled by main winding and the function of current forms internal compensation effect in the relation of auxiliary winding; With thyristor, regulate voltage and the electric current of main winding and auxiliary winding, can depend on that the motor easily Torque and speed square being directly proportional in the variation of voltage carries out speed governing within the scope of 50%-100% rated speed at its electromagnetic torque, and overcome with the inhibition voltage distortion effect of capacitor the defect that thyristor voltage regulation will produce harmonic voltage; Fig. 1 uses thyristor control main winding and auxiliary winding voltage but the mode of connection of non-control capacitor voltage, although its condenser current is via two windings, but the relation of its positive and negative counteracting does not produce magnetic potential, along with rushing of the triggering and conducting angle of thyristor is large, the magnitude of voltage of each winding moves closer in magnitude of voltage, electric current in major and minor two windings close to same-phase but the electric current of auxiliary winding is via the capacitor of series connection that the tortuous relation of another power end that arrives can make whole power factor close to 1.0, and should increase the torque phase of motor; Fig. 2 mode of connection can directly be controlled with three-phase thyristor voltage regulator, its capacitor and each winding are all subject to thyristor control, increase along with thyristor triggering and conducting angle, the corresponding increase of the voltage of each winding and capacitor and electric current, the distortion of its voltage waveform can only be effectively suppressed when capacitance voltage is larger; At auxiliary winding and main winding, keep electromotive force consistent, in the zigzag connection that its electric current is determined by capacitor, capacitor electrode is flowed through auxiliary winding and another power end that arrives has formed capacitor equivalent parallel in the interior compensating effect at the excitatory induction reactance two ends of the T-shaped equivalent circuit of motor, can form thus two kinds of energy inside samsara, reduce a series of energy saving effects of leakage reactance pressure drop and magnetic hysteresis loss; Select suitable condenser capacity and with thyristor, regulate in time, not only making capacitive and the mutual balance of perceptual energy, also in the variation of its winding voltage, making the corresponding variation of electromagnetic torque, and then can carry out simply speed governing in certain range of speeds; The startup of the pair of connecting wires underloading motor of auxiliary winding series capacitor, the compensating action that also can utilize its larger impedance and capacitance current reduction starting current by a relatively large margin.
Positive effect of the present invention is: adopt the compensation mode of connection in double winding and electric capacity, can make its reactive current be compensated from inside, and it is low more than 20% that its current effective value is declined in same even load; Utilize the filtering performance that capacitor has concurrently can make the voltage waveform distortion that thyristor voltage regulation produces eliminate, thereby overcome the significant deficiency of voltage and speed governing by transistor; Can within the scope of 50%-100% rated speed, carry out simply to the motor of blower fan, pump class speed governing.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 major loop winding diagram;
Fig. 2 is the embodiment of the present invention 2 major loop winding diagrams.
Embodiment
Embodiment 1
Adopt the asynchronous motor that Y-series rated voltage is 380V to transform, its stator and rotor cores and casing all do not need change, only need stator winding still to keep same electromotive force phase place and be divided into reciprocity two parts by the main winding and auxiliary winding of homophase, if the winding mode of two Huo Si road, road Huo Ba road parallel connections, only needs its end line untie and needn't change the coil in its wire casing unshakable in one's determination.The three-phase main winding Wa that winding construction and the number of turn are identical
1, Wb
1, Wc
1with three-phase auxiliary winding Wa
2, Wb
2, Wc
2, respectively the head end of major and minor two windings of homophase be connected and draw A
2, B
2, C
2three terminals, its three terminals first pass through T
1, T
2, T
3three bidirectional thyristors are to A
1, B
1, C
1three terminals, then through alternating-current switch K
1to A, B, tri-alternating current sources of C, and by three main winding Wa
1, Wb
1, Wc
1end be attached to successively B
1, C
1, A
1three terminals, three auxiliary winding Wa
2, Wb
2, Wc
2end with this Co that connects
1, Co
2, Co
3after capacitor, be attached to C
1, A
1, B
1three terminals; The main winding and auxiliary winding of three-phase is that the electromotive force phase place of homophase is identical, out of phase electromotive force phase place is held rear 2/3 π electromotive force phase angle successively, after the main winding and auxiliary winding of its homophase divides other first section to be connected, draw altogether 9 terminals to terminal box, the arrangement mode of its winding is identical with conventional motor.
Three bidirectional thyristor T of adjuster
1, T
2, T
3adopt conventional phase shift to trigger assembly and control, to control the mode of phase current, three pairs of windings are controlled; Capacitor Co
1, Co
2, Co
3rated voltage get 400V-460V, the numerical value ratio of the rated power (KW) of the total capacity of three power capacitors (KVAR) and motor is chosen as 0.4:1(condenser capacity and calculates by 400V).At K
1when alternating-current switch closure but bidirectional thyristor do not trigger, each capacitor can reach the effective value of line voltage, for example C0 through the through-flow loop of main winding and auxiliary winding
1capacitor, through B
1-Wa
1-Wa
2-Co
1-C
1loop make Co
1capacitor is close to 380V voltage effective value.Unexpectedly manage capacitance current through Wa
1with Wa
2two windings but it is from Wa1 end and then from Wa
2the condenser current that end goes out, because its winding to same phase is that positive and negative counteracting does not produce magnetic potential and electromotive force.
When T1 thyristor is gradually during triggering and conducting, Wa
1the voltage of main winding will progressively increase to A
1-B
1between line magnitude of voltage, Co
1condenser current also turn to gradually Wa
2winding provides separately and no longer via Wa
1winding.Trigger angle at three thyristors changes, when the perceptual performance number of condenser capacity and motor approaches, increase with main winding voltage, the rotating speed of motor is corresponding raising also, and can effectively subdue by relatively constant capacitance current the voltage waveform distortion that thyristor voltage regulation forms, thereby reach the double effects of the interior compensation of electric capacity and rotational speed regulation.
Embodiment 2
The transformation of this routine asynchronous motor, under original iron core and the constant condition of winding construction, only changes by the on line of its winding overhang every the form that has three terminals that forms.In the end of a thread of winding overhang connects, the winding of same magnetic circuit polarity must be linked to be to one group, to form when main winding or auxiliary winding are switched on separately, still can be with compared with little load and normally operation.The concrete mode of connection is: by Wa
1with Wa
2, Wb
1with Wb
2, Wc
1with Wc
2the head end of three pairs of main winding and auxiliary winding is connected respectively and draws A
2, B
2, C
2three terminals, its three end is first through T
1, T
2, T
3thyristor is to A
1, B
1, C
1again through three-phase ac contactor K
1aC power frequency supply end A, B, C to positive phase sequence; Three main winding Wa
1, Wb
1, Wc
1end successively with B
2, C
2, A
2three ends connect, at Wa
2winding end and C
2between end, connect Co
1capacitor, Co
2, Co
3capacitor correspondence is connected in Wb
2with A
2, Wc
2with B
2between end points.
The T of adjuster
1, T
2, T
3three bidirectional thyristors and phase shift trigger part thereof adopt existing three-phase thyristor voltage regulator, capacitor Co
1, Co
2, Co
3get 415V rated voltage, the total capacity of three power capacitors (KVAR) is got 0.65:1.0(capacitor with the numerical value ratio of motor rated power (KW) and is calculated by 415V).At K
1when alternating-current switch closure and three bidirectional thyristor triggering and conducting, main winding and auxiliary winding and capacitor are corresponding to electric current, and the voltage of its capacitor also progressively increases.In the control increasing gradually with three thyristor triggering and conducting angles at three main winding voltages, the voltage of three corresponding auxiliary winding and capacitance current are also synchronizeed increase.For the motor of blower fan, pump class, carry out the speed governing within the scope of 50%-100% rated speed by regulation voltage mode, especially in speed governing, carry out the adjusting of reactive power simultaneously, there is practicality and economy widely.The phase shift conduction mode of this thyristor, can electricity consumption the rotating speed of the series compensation effect that forms of container during to low-voltage produce stabilization, thereby effectively make up or improve deficiency and the defect of voltage and speed governing by transistor.
Claims (2)
1. a capacitor compensation type asynchronous machine pressure-speed regulating device, comprises stator winding, alternating-current switch, capacitor and adjuster, its feature in, threephase stator winding is divided into major and minor two groups of windings, the main winding w of three-phase
a1, w
b1, w
c1auxiliary winding w with three-phase
a2, w
b2, w
c2respectively the head end of major and minor two windings of homophase is connected and draws A
2, B
2, C
2three terminals, its three terminals are first through T
1, T
2, T
3three bidirectional thyristors of adjuster are to A
1, B
1, C
1three terminals, then through alternating-current switch K
1to A, B, tri-alternating current sources of C; Three main winding w
a1, w
b1, w
c1three ends be attached to successively B
1, C
1, A
1three terminals, or be attached to successively B
2, C
2, A
2three terminals, three auxiliary winding w
a2, w
b2, w
c2identical with the electromotive force phase place of identical main winding respectively, its winding end C that connects successively
01, C
02, C
03after capacitor, be attached to C
1, A
1, B
1three terminals, or series connection C
01, C
02, C
03after capacitor, be attached to C
2, A
2, B
2three terminals; Described w
a1with w
a2, w
b1with w
b2, w
c1with w
c2the main winding of three pairs of homophases and auxiliary winding, its winding construction and the number of turn are identical respectively, and the mutual electromotive force phase angle of each phase winding differs 2/3 π phase angle, draws altogether 9 binding posts after the main winding and auxiliary winding of its homophase divides other head end to be connected.
2. a kind of capacitor compensation type asynchronous machine pressure-speed regulating device according to claim 1, is characterized in that three bidirectional thyristor T of described adjuster
1, T
2, T
3adopt phase shift firing control; Described capacitor C
01, C
02, C
03rated voltage and the rated voltage of the motor ratio that adopts 1-1.15:1, the numerical value ratio of the total capacity of three power capacitors and the rated power of motor is 0.4-0.65:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320743486.9U CN203590121U (en) | 2013-11-23 | 2013-11-23 | Capacitor compensation type asynchronous motor pressure-regulating speed-regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320743486.9U CN203590121U (en) | 2013-11-23 | 2013-11-23 | Capacitor compensation type asynchronous motor pressure-regulating speed-regulating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203590121U true CN203590121U (en) | 2014-05-07 |
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|---|---|---|---|
| CN201320743486.9U Expired - Fee Related CN203590121U (en) | 2013-11-23 | 2013-11-23 | Capacitor compensation type asynchronous motor pressure-regulating speed-regulating device |
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| Country | Link |
|---|---|
| CN (1) | CN203590121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618494A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Capacitor compensation type voltage and speed regulating device for asynchronous motor |
-
2013
- 2013-11-23 CN CN201320743486.9U patent/CN203590121U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618494A (en) * | 2013-11-23 | 2014-03-05 | 国家电网公司 | Capacitor compensation type voltage and speed regulating device for asynchronous motor |
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|---|---|---|---|
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| 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 |