CN103546087A - Non-frequency conversion capacitance speed regulation and winding connection circuit of asynchronous motor - Google Patents
Non-frequency conversion capacitance speed regulation and winding connection circuit of asynchronous motor Download PDFInfo
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Abstract
The invention discloses a non-frequency conversion capacitance speed regulation and winding connection circuit of an asynchronous motor. The non-frequency conversion capacitance speed regulation and winding connection circuit comprises a non-frequency conversion capacitance speed regulation circuit and a winding connection loop. The non-frequency conversion capacitance speed regulation circuit comprises three single-phase capacitors and a speed regulation circuit, and the speed regulation circuit adopts a three-phase rectifier bridge speed regulation circuit or a three-phase half-control rectifier bridge speed regulation circuit or a single-phase rectifier bridge speed regulation circuit. The winding connection loop comprises a primary three-phase winding and a secondary three-phase winding, the primary three-phase winding and the secondary three-phase winding adopt duplex-winding zigzag-shaped or duplex-winding triangular or duplex-winding Y-shaped connection, the primary three-phase winding is used for connecting a power supply end through an alternating-current switch, and tail ends of the secondary three-phase winding are respectively used for leading out control ends connected with the speed regulation circuit. The three single-phase capacitors are respectively connected in series onto tail ends of the duplex-winding zigzag-shaped primary three-phase winding or onto tail ends of the duplex-winding triangular secondary three-phase winding, or are respectively connected in parallel onto the duplex-winding Y-shaped secondary three-phase winding.
Description
Technical field
The present invention relates to Subject " Electric Machinery " field, the non-frequency electric capacity governing and the winding that relate in particular to a kind of asynchronous machine connect circuit.
Background technology
The speed adjusting technique of current asynchronous motor, using has following several types more widely: stator variable voltage speed control technology is applicable to the speed governing of blower fan, load of the pumps to square principle being directly proportional of its voltage U based on electromagnetic torque T, but compared with large slip power, will consume on rotor resistance during its low speed and have a problem that waste of energy is larger.Voltage-type is handed over the frequency control that a PWM who hands over controls always, the principle changing by torque based on constant voltage and frequency ratio and rotating speed, adopt triangular carrier comparison method and control its three groups of switching devices, but it does not relate to the problem of reactive current substantially, and the switching frequency in the inversion of its rectification and 6-16KHz all will cause the problem of harmonic loss to power supply and motor.Tandem control adopts one end to switch through sub-winding, and its frequency and voltage become with revolutional slip S, another termination power, and its frequency and voltage are fixed, and make it be suitable for S < 0.4 and the less occasion of speed adjustable range.Reactive loss to asynchronous motor, adopting capacitor to carry out internal compensation is good way, as ZL01228605.2 " Double-winding capacitance internal compansation motor ", adopt secondary winding and a phase capacitor of a mutually former limit winding, the phase that lags behind to be linked to be a leg-of-mutton wiring, utilize the capacitor of tortuous series connection to make the electric current phasor of its main winding and auxiliary winding close to equating, improve its power factor; " the interior compensation winding of alternating current motor " of ZL03145525.5, adopt the zigzag connection of hexagon and star pattern, and in the winding segments of π/3 voltage phase angle that relatively lags behind the way of single-phase electricity container in parallel, with this, realize the symmetrical compensation of capacitance current to the inductance current in winding.Compensation methodes all exist the electric current of capacitor not change and smoothly to carry out regulating and affect the problem of energy-saving effect with motor load in these.For another example, " capacitance speed regulating type wound rotor composition motor " of ZL2010200040350.2, adopt the magnetic potential phasor of controlling two stator winding, and then the electromotive force of control series connection two rotor windings, in controlling its no-load speed, produce the effect that regulates its rotating speed, but the voltage constant of its main winding is constant and the classification regulative mode of many alternating-current switchs, also there is main winding loss greatly and the rough problem of speed governing.
Summary of the invention
The object of this invention is to provide a kind of non-frequency electric capacity governing of asynchronous machine and winding and connect circuit, can and change the rotating speed of motor to the level and smooth adjusting of electromagnetic torque, reduce winding electric energy loss, improve electric capacity governing flatness and energy-saving horizontal.
The technical solution used in the present invention is:
Non-frequency electric capacity governing and winding connect a circuit, comprise non-frequency electric capacity governing circuit and winding connecting loop; Non-frequency electric capacity governing circuit comprises three single-phase electricity containers and alignment circuit, alignment circuit adopts three-phase commutation bridge alignment circuit or three-phase half-controlled rectifier bridge alignment circuit or three single-phase rectification bridge alignment circuits, and in the connection of rectifier bridge direct current two ends, can turn-off electronic device and carry out PWM control; Described winding connecting loop comprises three-phase main winding and three-phase auxiliary winding, three-phase main winding and three-phase auxiliary winding adopt double winding indentation or double winding triangle or the combined connection of double winding, three-phase main winding head end is connected in power end by alternating-current switch, and the main winding of three-phase and the end of auxiliary winding are respectively used to be connected the control end of alignment circuit; Wherein, three single-phase electricity containers are series at respectively the head end of the zigzag three-phase auxiliary winding of double winding or are series at the end of double winding triangle three-phase auxiliary winding or are parallel to the combined three-phase auxiliary winding of double winding.
Described double winding indentation connects by three single-phase electricity containers and control end and connects three-phase commutation bridge alignment circuit, the head end that is first-phase main winding connects power end by alternating-current switch, the end of first-phase main winding connects the head end of the 3rd auxiliary winding by the first single-phase electricity container, the end of the 3rd auxiliary winding connects the head end of second-phase main winding, the head end of second-phase main winding connects power end by alternating-current switch, the end of second-phase main winding connects the head end of first-phase auxiliary winding by the second single-phase electricity container, the end of first-phase auxiliary winding connects the head end of third phase main winding, the head end of third phase main winding connects power end by alternating-current switch, the end of third phase main winding connects the head end of second-phase auxiliary winding by the 3rd single-phase electricity container, the end of second-phase auxiliary winding connects the head end of first-phase main winding, the first-phase of three-phase commutation bridge alignment circuit comprises the first rectifier diode and second rectifier diode of series connection, the negative electrode of the first rectifier diode connects the collector electrode of insulated gate bipolar transistor, the emitter of the anodic bonding insulated gate bipolar transistor of the second rectifier diode, between the first rectifier diode and the second rectifier diode, access the end of first-phase main winding, the second-phase of three-phase commutation bridge alignment circuit is identical with first-phase structure with third phase.
Described double winding triangle connects by three single-phase electricity containers and control end and connects three-phase half-controlled rectifier bridge alignment circuit, the head end that is first-phase main winding is connected power end with the head end of first-phase auxiliary winding by alternating-current switch, the end of first-phase auxiliary winding connects third phase main winding head end by the first single-phase electricity container, the head end of second-phase main winding is connected power end with the head end of second-phase auxiliary winding by alternating-current switch, the end of second-phase auxiliary winding connects first-phase main winding head end by the second single-phase electricity container, the head end of third phase main winding is connected power end with the head end of third phase auxiliary winding by alternating-current switch, the end of third phase auxiliary winding connects second-phase main winding head end by the 3rd single-phase electricity container, each of three-phase half-controlled rectifier bridge alignment circuit includes mutually rectifier diode and the thyristor of series connection and forms the loop of direct current shorted on both ends, connects corresponding control end between rectifier diode and thyristor.
The combined connection of described double winding is by same model, the main motor and the auxiliary-motor that with power and two rotors, are linked into loop form, the combined connection of double winding connects respectively single-phase rectification bridge alignment circuit by three single-phase electricity containers and control end, the head end of main motor first-phase winding connects power end by alternating-current switch, the end of main motor first-phase winding connects the head end of main motor third phase winding by auxiliary-motor second-phase winding, the head end of main motor third phase winding connects power end by alternating-current switch, the end of main motor third phase winding connects the head end of main motor second-phase winding by auxiliary-motor first-phase winding, the head end of main motor second-phase winding connects power end by alternating-current switch, the end of main motor second-phase winding connects the head end of main motor the first main winding by auxiliary-motor third phase winding, the first single-phase electricity container is parallel to auxiliary-motor first-phase winding, the second single-phase electricity container is parallel to auxiliary-motor second-phase winding, the 3rd single-phase electricity container is parallel to auxiliary-motor third phase winding, single-phase rectification bridge alignment circuit comprises three groups of single-phase rectification bridge alignment circuits that structure is identical, the first single-phase rectification bridge alignment circuit comprises the rectifier diode of two groups of parallel connections, every group of rectifier diode that comprises two series connection, every group of rectifier diode and turn-off thyristor are connected into loop, access the head end of main motor first-phase winding between the rectifier diode of first group of two series connection, between the rectifier diode of second group of two series connection, access the end of main motor third phase winding, between the rectifier diode of first group of two series connection of the second single-phase rectification bridge alignment circuit, access the head end of main motor second-phase winding, between the rectifier diode of second group of two series connection, access the end of main motor first-phase winding, between the rectifier diode of first group of two series connection of the 3rd single-phase rectification bridge alignment circuit, access the head end of main motor third phase winding, between the rectifier diode of second group of two series connection, access the end of main motor second-phase winding.
The present invention is by adjuster and in non-frequency mode, control the voltage phasor of three-phase main winding and auxiliary winding and interior compensation condenser thereof, and then in the level and smooth adjusting of electromagnetic torque, change the method for its rotating speed, two asynchronous motors of asynchronous motor and rotor combination are produced to significant energy-saving effect in two adjusting of power factor and rotating speed.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the embodiment of the present invention 1 double winding indentation and non-frequency electric capacity governing;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention 2 double winding triangles and non-frequency electric capacity governing;
Fig. 3 is the circuit theory diagrams of the embodiment of the present invention 3 double winding combination shapes and non-frequency electric capacity governing.
Embodiment
As shown in Figure 1, 2, 3, the present invention includes non-frequency electric capacity governing circuit and winding connecting loop; Non-frequency electric capacity governing circuit comprises three single-phase electricity containers and alignment circuit, and alignment circuit adopts three-phase commutation bridge alignment circuit or three-phase half-controlled rectifier bridge alignment circuit or three single-phase rectification bridge alignment circuits; Described winding connecting loop comprises three-phase main winding and three-phase auxiliary winding, three-phase main winding and three-phase auxiliary winding adopt double winding indentation or double winding triangle or the combined connection of double winding, three-phase main winding head end is used for connecting power end by alternating-current switch, and the end of three-phase auxiliary winding is respectively used to draw the control end that connects alignment circuit; Wherein, three single-phase electricity containers are series at respectively the end of the zigzag three-phase main winding of double winding or are series at the end of double winding triangle three-phase auxiliary winding or are parallel to the combined three-phase auxiliary winding of double winding.
Operation principle and feature that the present invention combines winding connection are: stator voltage decision main flux and its torque based on asynchronous motor depend on that main flux is with the principle of rotor current, the mode of connection that adopts two stator winding and its auxiliary winding is connected with electrical equipment, utilize the leading phasor synthesis of capacitance current, the relation that makes stator current lag behind voltage phasor changes, utilize the inner loop process of the synthetic and two kinds of energy of the phasor of capacitance current and inductive current, improved greatly power factor and the efficiency of motor; The inductive load feature of asynchronous motor makes its electric current phasor lag behind voltage phasor within the scope of 30 °-60 °, to this only in the voltage phasor of capacitor when the winding of connecting is the phase angle of 120 °-150 ° of hysteresis, can make two electric current phasors in the stator double winding of magnetic circuit coupling close to same-phase, and the electric current phasor that AC power is provided is identical close to phase angle with voltage phasor; Equivalent parallel excitatory induction reactance X in the T-shaped equivalent circuit of motor that interior compensation condenser forms
mthe feature at two ends, can not only make its induced potential raise and stator winding leakage reactance X
1pressure drop reduce, can also make its magnetic hysteresis loss and harmonic loss reduce by a relatively large margin; Because the voltage phasor of main winding is mainly controlled by power supply, the voltage phasor of its auxiliary winding depends on main winding and electric current phasor is controlled by capacitor, this just formed can to main winding voltage with secondary around but two conditions that electric current regulates respectively, therefore to separate unit motor, in adjusting stator voltage mode, can carry out rotational speed regulation more among a small circle, and the bi-motor of combined rotor is carried out to rotational speed regulation in a big way in the phase shift mode of stator voltage; The induced potential phase place that the rotating magnetic field of asynchronous machine can make auxiliary winding is basic identical or differ certain angle with main winding, capacitance current in auxiliary winding certainly will be through between two windings magnetic circuit coupling and affect the electric current of main winding, phasor is synthesized and can be reduced greatly the current effective value that power supply provides thus; For two rotor rigid attachment and winding, be linked into the composition motor in loop, utilizing it is two regulatory functions that adjusting amplitude shifts again its voltage-phase to two stator winding, formed the condition that combined rotor electromotive force is controlled by two stator winding magnetic potentials, variation by its composite magnetic power phasor complications impels rotor current to change, and then by the variation of rotor winding induced potential, is changed the ideal no-load speed of asynchronous machine.
The principle of control of the present invention and speed governing is: at the positive and negative two ends of rectifier bridge, in the anodal mode of positive termination, connecting one may power-off power device T
1the adjuster forming, can enough rectifying tubes replace the change of current and turn-off device carries out pulse width control with upper frequency, disjunct three neutral ends of three-phase main winding (end) are carried out to the continuous adjusting of voltage, and directly or indirectly the voltage phasor of three capacitors is controlled, the for example combination wiring of Fig. 1, via the T of two rectifying tubes and transient switching
1manage, make two end closures of main winding, and at T
1after pipe moment disconnection, the winding that it is through-flow still can continue via single-phase electricity container through-flow, for another example the A in Fig. 1
1-W
a1-A
0-C
01-W
c2-B
1series arm, its W under the effect of rotational voltage
a1compared with W
c2the voltage phasor of winding remains the relation of the 2/3 π phase angle that lags behind, and at T
1in the control that conducting width increases, two windings shift to leading direction gradually, C
01voltage phasor to hysteresis direction, shift and approach respectively phase voltage value; When condenser capacity value is chosen as the 40%-60% of motor nameplate performance number, the magnitude of voltage of major-minor winding approximately rises to rated value Uh gradually from 70%Uh, makes the corresponding growth of rotating speed of fan-type motor; The pulse width modulation (PWM) that adjuster adopts is relatively simple, only need the fixing isoceles triangle carrier voltage (2-10KHZ) of DC reference voltage and amplitude to compare and take out control signal, control constantly the work of its on-off-Tong, the adjusting that utilizes the natural performance of handoffs of three-phase commutation bridge to hold its alternating voltage amount of sliding carrying out level with both hands to three interchanges with a turn-off device; The voltage phasor of the capacitor institute that lags behind join that between auxiliary winding voltage phasor and its major-minor winding, to have magnetic circuit coupled relation be the basic condition of combination wiring and adjusting, and the electric current phasor in major and minor two windings all approaches amplitude and phase place and can produce the smoothly effect of control of obvious raising power factor and rotating speed when equal.
Implementation column 1 of the present invention, comprises that double winding indentation connects by three single-phase electricity containers and control end connection three-phase commutation bridge alignment circuit, i.e. first-phase main winding W
a1head end by alternating-current switch K
1connect power end, the end of first-phase main winding is by the first single-phase electricity container C
01the head end that connects the 3rd auxiliary winding, the 3rd auxiliary winding W
c2end connect the head end of second-phase main winding, second-phase main winding W
b1head end by alternating-current switch K
1connect power end, the end of second-phase main winding is by the second single-phase electricity container C
02the head end that connects first-phase auxiliary winding, first-phase auxiliary winding W
a2end connect the head end of third phase main winding, third phase main winding W
c1head end by alternating-current switch K
1connect power end, the end of third phase main winding is by the 3rd single-phase electricity container C
03the head end that connects second-phase auxiliary winding, second-phase auxiliary winding W
b2end connect the head end of first-phase main winding; The first-phase of three-phase commutation bridge alignment circuit comprises the first rectifier diode and second rectifier diode of series connection, and the negative electrode of the first rectifier diode connects insulated gate bipolar transistor T
1collector electrode, the emitter of the anodic bonding insulated gate bipolar transistor of the second rectifier diode, between the first rectifier diode and the second rectifier diode, access the end of first-phase main winding, the second-phase of three-phase commutation bridge alignment circuit is identical with first-phase structure with third phase.
The three-phase cage asynchronous motor that employing drags water pump class carries out reducing energy consumption.660V three-phase yconnected stator winding is divided into major and minor totally six windings, and the main winding and auxiliary winding of its three-phase is designed to 380 * 1.08=410V magnitude of voltage, and gets the identical number of turn and conductor cross-section, and the electromotive force phase place of the primary and secondary winding of every phase is identical; Three single-phase electricity containers are selected 400-460V load voltage value, and under 380V voltage, condenser current is 30% of rated value electric current I h on motor nameplate; D1-D6 rectifying tube and the T of adjuster
1(IGBT) rated current is chosen as 3Ih, and load voltage value is selected 1600V.
The combination mode of connection is as shown in Figure 1: three-phase main-frequency 660V voltage and be that A, B, C tri-ends of positive phase sequence are through K
1a.C. contactor and the A that arrives
1, B
1, C
1three terminals; At A
1end connects W
a1main winding head end and W
b2auxiliary winding end, B
1end connects Wb
1main around head end and W
c2auxiliary winding end, C
1end connects W
c1main winding head end and W
a2auxiliary winding end; At W
a1, W
b1, W
c1the end of three main windings is drawn A successively
0, B
0, C
0three adjustable sides, and same C successively
01, C
02, C
03same W again after three capacitor's seriess
c2, W
a2, W
b2the head end of three auxiliary winding is connected; With D1-D6 rectifier diode, be unified into three-phase commutation bridge.And in DC terminal, with anode, join anodal mode and connect T1 insulated gate bipolar transistor IGBT and form combination wiring.IGBT pipe adopts the PWM that each pulsewidth is equal to control, and the frequency of its triangular carrier is 10KHz, and reference voltage is adjustable direct current.
As closed K
1after A.C. contactor, the main winding of three-phase and the voltage phasor of auxiliary winding shift the phase angle close to 30 ° to hysteresis direction respectively, and single-phase electricity container approximately shifts 30 ° of phase angles to leading direction; Regulating gradually T
1during the width of pipe conducting, each winding voltage phasor shifts and approaches specified phase voltage value to leading direction respectively, and the rotating speed of motor is approximately from 75% rated speed to rising at full speed, and whole power factor value also has obvious energy-saving effect close to 1.0.
Embodiments of the invention 2, comprise that double winding triangle connects by three single-phase electricity containers and control end connection three-phase half-controlled rectifier bridge alignment circuit, and the head end of the head end of first-phase main winding and first-phase auxiliary winding is by alternating-current switch K
1connect power end, the end of first-phase auxiliary winding is by the first single-phase electricity container C
01connect third phase main winding head end, the head end of second-phase main winding is connected power end with the head end of second-phase auxiliary winding by alternating-current switch, and the end of second-phase auxiliary winding is by the second single-phase electricity container C
02connect first-phase main winding head end, the head end of third phase main winding is connected power end with the head end of third phase auxiliary winding by alternating-current switch, and the end of third phase auxiliary winding is by the 3rd single-phase electricity container C
03connect second-phase main winding head end; Each of three-phase half-controlled rectifier bridge alignment circuit includes mutually rectifier diode and the thyristor of series connection and forms loop, connects corresponding control end between rectifier diode and thyristor.
Asynchronous motor for Y-series 380V Driving Fan class redesigns, and its stator winding adopts double-deck complete (whole) pitch arrangement, and main winding and auxiliary winding is occupied respectively to one deck and by W
a1compared with W
ab2, W
b1compared with W
bc2, W
c1compared with W
ca2the 30 ° of voltage phase angle modes that lag behind are respectively arranged, and the rated voltage of three single-phase electricity containers is chosen as 460V, and its total capability value is chosen by 40% of motor nameplate performance number (KW).Adopt three triode thyristor T
11, T
13, T
15with three rectifying tube D
4, D
6, D
2be unified into three-phase half-controlled rectifier bridge, and by DC terminal short circuit, adopt phase shift triggering mode to carry out its control.
The combination mode of connection is: A, the B of three-phase 380V positive phase sequence, C tri-ends are through K
1a.C. contactor is to A
1, B
1, C
1three ends; W
a1with W
ab2the head end of major and minor rich group and A
1end is connected, W
b1with W
bc2two head ends and B
1end is connected, W
c1with W
ca2two head ends and C
1end is connected; W
a1, W
b1, W
c1the main winding end of three phase voltages is drawn A successively
0, B
0, C
0three adjustable sides, and at W
ab2end and C
1end, W
bc2end and A
1end, W
ca2end and B
1three pairs of end points between connect successively C
01, C
02, C
03three single-phase electricity containers; A
0, B
0, C
0three adjustable sides are attached to three thyristors and three half control rectifier bridges that rectifying tube is unified into.
Work as K
1after A.C. contactor closure, W
ab2auxiliary winding and C
01, W
bc2auxiliary winding and C
02, W
ca2auxiliary winding and C
03three are in series with respectively single-phase electricity container and apply three branch roads of line voltage through-flow respectively, utilize its electromagnetic torque and square relation being directly proportional of voltage that motor can moved compared with under the slow-speed of revolution; At T
11, T
13, T
15when the control phase of three thyristors moves forward gradually, adjuster increases On current gradually and makes A
0, B
0, C
0the magnitude of voltage of three adjustable sides is close to zero, corresponding W
a1, W
b1, W
c1the voltage phasor of three main windings is close to the numerical value of the 220V of phase voltage, and motor speed also rises to rated speed gradually, and reaches more than 20% energy-saving effect at the more conventional motor generation of same even load reduction current effective value.
The embodiment of the present invention 3, comprise that the combined connection of double winding is by same model, main motor with power and coaxial rigid connection forms and becomes sliver to be linked into loop two rotor windings with auxiliary-motor, the combined connection of double winding connects single-phase rectification bridge alignment circuit by three single-phase electricity containers and control end, the head end of main motor first-phase winding connects power end by alternating-current switch, the end of main motor first-phase winding connects the head end of main motor third phase winding by auxiliary-motor second-phase winding, the head end of main motor third phase winding connects power end by alternating-current switch, the end of main motor third phase winding connects the head end of main motor second-phase winding by main motor first-phase winding, the head end of main motor second-phase winding connects power end by alternating-current switch, the end of main motor second-phase winding connects the head end of main motor first-phase winding by auxiliary-motor third phase winding, the first single-phase electricity container is parallel to auxiliary-motor first-phase winding, the second single-phase electricity container is parallel to auxiliary-motor second-phase winding, the 3rd single-phase electricity container is parallel to auxiliary-motor third phase winding, single-phase rectification bridge alignment circuit comprises three groups of single-phase rectification bridge alignment circuits that structure is identical, the first single-phase rectification bridge alignment circuit comprises the rectifier diode of two groups of parallel connections, every group of rectifier diode that comprises two series connection, every group of rectifier diode and turn-off thyristor are connected into loop, access the head end of main motor first-phase main winding between the rectifier diode of first group of two series connection, between the rectifier diode of second group of two series connection, access the end of auxiliary-motor third phase winding, between the rectifier diode of first group of two series connection of the second single-phase rectification bridge alignment circuit, access the head end of main motor second-phase winding, between the rectifier diode of second group of two series connection, access the end of main motor first-phase main winding, between the rectifier diode of first group of two series connection of the 3rd single-phase rectification bridge alignment circuit, access the head end of main motor third phase winding, between the rectifier diode of second group of two series connection, access the end of main motor second-phase winding.
For dragging the asynchronous motor of two output shafts of horizontal-type biaxial rneader by two wound rotor YR types of gear-linked, do not changing under the condition of motor stator 380V winding construction, only need delta connection untied and six terminals of its three windings are drawn from terminal box.Its three power capacitors are selected 415V load voltage value, and its capacity of three equates with the name plate rating value of separate unit motor.Due to the switched in opposite of two motors that are arranged in parallel, therefore the phase sequence of the rotor voltage at wound rotor collector ring place is also carried out Commutating connect mutually on the contrary accordingly.The position that the model of two motors, power and stator winding are arranged is all identical, and with three single-phase adjusters of same structure, it is carried out to the adjusting of 10%-100% rated speed.
The combination mode of connection is: A, the B of three-phase 380V power supply, C tri-ends are through K
1alternating-current switch is to A
1, B
1, C
1three ends, by same model and with two motors of power, one of them is set as main motor, and another is auxiliary-motor, and according to A
1-W
ab1-B
0-W
bc2-C
1-W
ca1-A
0-W
ab2-B
1-W
bc1-C
0-W
ca2-A
1loop order six windings are connected, and at A
1-C
0, B
1-A
0, C
1-B
0between three docking line ends, connect successively C
01, C
02, C
03three Monophase electric power capacitors; Three single-phase adjusters adopt respectively D
1-D
4, D
5-D
8, D
9-D
12four rectifying tubes form single-phase rectifiers, and its minute other DC terminal connect successively T
11, T
12, T
13a thyristor GTO that gate pole turn-offs, at A
1-A
0, B
1-B
0, C
1-C
0on three docking line ends, draw six lines and be connected to respectively single-phase adjuster.
At K
1alternating-current switch is closed but while not connecting capacitor, voltage on each winding is only 190V, and the voltage phasor of two windings of homophase tortuous transfer under the condition of 60 ° respectively, the rotating speed of composition motor only maintains under 10% rated speed, and after three single-phase electricity containers drop into, its winding voltage and rotating speed slightly raise; When the conducting width of three adjusters controlling at PWM increases, three pairs regulate the magnitude of voltage between end points to zero, to change gradually from 330V, and the voltage phasor of each winding will shift respectively 60 ° of phase angles and change to 380V magnitude of voltage, and its rotating speed also moves closer to rated value.This mode of speed regulation be to the voltage magnitude of stator winding regulate with phase place simultaneously, at the induced potential of the two rotor winding loops of connecting and current controlled under the internal factor of two stator winding composite magnetic powers, the unloaded angular speed of ideal of two motors is changed, thereby produce speed governing and energy-conservation all good effects with simple control device.This mode of speed regulation has use value equally to lengthening two stator motors of cage-type rotor.
Claims (4)
1. the non-frequency electric capacity governing of asynchronous machine and winding connect a circuit, it is characterized in that: comprise non-frequency electric capacity governing circuit and winding connecting loop; Non-frequency electric capacity governing circuit comprises three single-phase electricity containers and alignment circuit, alignment circuit adopts three-phase commutation bridge alignment circuit or three-phase half-controlled rectifier bridge alignment circuit or three single-phase rectification bridge alignment circuits, and in the connection of rectifier bridge direct current two ends, can turn-off electronic device and carry out PWM control; Described winding connecting loop comprises three-phase main winding and three-phase auxiliary winding, three-phase main winding and three-phase auxiliary winding adopt double winding indentation or double winding triangle or the combined connection of double winding, three-phase main winding head end is used for connecting power end by alternating-current switch, and the end of three-phase auxiliary winding is respectively used to draw the control end that connects alignment circuit; Wherein, three single-phase electricity containers are series at respectively the head end of the zigzag three-phase auxiliary winding of double winding or are series at the end of double winding triangle three-phase auxiliary winding or are parallel to the combined three-phase auxiliary winding of double winding.
2. the non-frequency electric capacity governing of asynchronous machine according to claim 1 and winding connect circuit, it is characterized in that: described double winding indentation connects by three single-phase electricity containers and control end and connects three-phase commutation bridge alignment circuit, the head end that is first-phase main winding connects power end by alternating-current switch, the end of first-phase main winding connects the head end of the 3rd auxiliary winding by the first single-phase electricity container, the end of the 3rd auxiliary winding connects the head end of second-phase main winding, the head end of second-phase main winding connects power end by alternating-current switch, the end of second-phase main winding connects the head end of first-phase auxiliary winding by the second single-phase electricity container, the end of first-phase auxiliary winding connects the head end of third phase main winding, the head end of third phase main winding connects power end by alternating-current switch, the end of third phase main winding connects the head end of second-phase auxiliary winding by the 3rd single-phase electricity container, the end of second-phase auxiliary winding connects the head end of first-phase main winding, the first-phase of three-phase commutation bridge alignment circuit comprises the first rectifier diode and second rectifier diode of series connection, the negative electrode of the first rectifier diode connects the collector electrode of insulated gate bipolar transistor, the emitter of the anodic bonding insulated gate bipolar transistor of the second rectifier diode, between the first rectifier diode and the second rectifier diode, access the end of first-phase main winding, the second-phase of three-phase commutation bridge alignment circuit is identical with first-phase structure with third phase.
3. the non-frequency electric capacity governing of asynchronous machine according to claim 1 and winding connect circuit, it is characterized in that: described double winding triangle connects by three single-phase electricity containers and control end and connects three-phase half-controlled rectifier bridge alignment circuit, the head end that is first-phase main winding is connected power end with the head end of first-phase auxiliary winding by alternating-current switch, the end of first-phase auxiliary winding connects third phase main winding head end by the first single-phase electricity container, the head end of second-phase main winding is connected power end with the head end of second-phase auxiliary winding by alternating-current switch, the end of second-phase auxiliary winding connects first-phase main winding head end by the second single-phase electricity container, the head end of third phase main winding is connected power end with the head end of third phase auxiliary winding by alternating-current switch, the end of third phase auxiliary winding connects second-phase main winding head end by the 3rd single-phase electricity container, each of three-phase half-controlled rectifier bridge alignment circuit includes mutually rectifier diode and the thyristor of series connection and forms the loop of direct current shorted on both ends, connects corresponding control end between rectifier diode and thyristor.
4. the non-frequency electric capacity governing of asynchronous machine according to claim 1 and winding connect circuit, it is characterized in that: the combined connection of described double winding is by same model, the main motor being connected with power and two rotor windings and auxiliary-motor form, the combined connection of double winding connects respectively single-phase rectification bridge alignment circuit by three single-phase electricity containers and control end, the head end of main motor first-phase winding connects power end by alternating-current switch, the end of main motor first-phase winding connects the head end of main motor third phase winding by auxiliary-motor second-phase winding, the head end of main motor third phase winding connects power end by alternating-current switch, the end of main motor third phase winding connects the head end of main motor second-phase winding by auxiliary-motor first-phase winding, the head end of main motor second-phase winding connects power end by alternating-current switch, the end of main motor second-phase winding connects the head end of main motor first-phase winding by auxiliary-motor third phase winding, the first single-phase electricity container is parallel to auxiliary-motor first-phase winding, the second single-phase electricity container is parallel to auxiliary-motor second-phase winding, the 3rd single-phase electricity container is parallel to auxiliary-motor third phase winding, single-phase rectification bridge alignment circuit comprises three groups of single-phase rectification bridge alignment circuits that structure is identical, the first single-phase rectification bridge alignment circuit comprises the rectifier diode of two groups of parallel connections, every group of rectifier diode that comprises two series connection, every group of rectifier diode and turn-off thyristor are connected into loop, access the head end of main motor first-phase winding between the rectifier diode of first group of two series connection, between the rectifier diode of second group of two series connection, access the end of main motor third phase winding, between the rectifier diode of first group of two series connection of the second single-phase rectification bridge alignment circuit, access the head end of main motor second-phase winding, between the rectifier diode of second group of two series connection, access the end of main motor first-phase winding, between the rectifier diode of first group of two series connection of the 3rd single-phase rectification bridge alignment circuit, access the head end of main motor third phase winding, between the rectifier diode of second group of two series connection, access the end of main motor second-phase winding.
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| CN110892633B (en) * | 2017-07-25 | 2023-06-23 | 三菱电机株式会社 | Driving device, compressor, air conditioner and driving method |
| CN113726260A (en) * | 2021-09-30 | 2021-11-30 | 刘建平 | Automatic internal compensation control device for asynchronous motor capacitor |
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