CN102684591A - Direct current (ZLDL) asynchronous motor - Google Patents
Direct current (ZLDL) asynchronous motor Download PDFInfo
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- CN102684591A CN102684591A CN2011100624088A CN201110062408A CN102684591A CN 102684591 A CN102684591 A CN 102684591A CN 2011100624088 A CN2011100624088 A CN 2011100624088A CN 201110062408 A CN201110062408 A CN 201110062408A CN 102684591 A CN102684591 A CN 102684591A
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Abstract
The invention relates to a direct current (ZLDL) asynchronous motor which describes a method for modifying an alternating current (AC) asynchronous motor driven by an AC voltage source into a direct current (DC) asynchronous motor driven by a direct current source. The direct current (ZLDL) asynchronous motor provides a theoretical basis for developing high-quality low-price asynchronous motor speed regulators and vehicle motors. The direct current (ZLDL) asynchronous motor gives the waveform of normal work direct current of the DC asynchronous motor and the block diagram of a drive for generating the current waveform.
Description
Technical field
The present invention sets forth the method that how directly drives asynchronous electric with DC current source.This relates to two key issues: the one, can produce the rotating magnetic field of at the uniform velocity rotating during the stator winding of which type of direct current through asynchronous motor; The 2nd, how to produce needed direct current.Main purpose of the present invention is for manufacturing and designing the DC asynchronous motor based theoretical, so that for electric automobile provides economical and practical, and the motor of function admirable.Also can explore DC asynchronous motor thus, electric locomotive, and the application prospect in field such as ac motor speed control device at electric car.
Background technology
The cheap again electric automobile of development function admirable has been a urgent subject, has limitless business opportunity.Solve and scabrous problem mainly contains two.The one, power supply, existing automotive battery, no matter from capacity, volume, weight, durability, price are all difficult satisfactory.The 2nd, motor, this also is an important problem.Since the finite capacity of battery just more need use efficient high, function admirable, maintaining is simple, durable in use and inexpensive motor.From these aspects, present alternative vehicula motor is still barely satisfactory.
At present, most of electric automobiles are still selected traditional DC series motor for use, and this motor has the very good mechanical property (software feature) of the powered vehicle of being suitable for, and promptly rotating speed can descend rapidly when being hampered, and torque is risen greatly.Its disadvantage is to adopt the carbon brush commutator structure, thereby costs an arm and a leg, the maintaining difficulty.
The brshless DC motor that receives publicity now has two kinds, is called DC Brushless Motor (BCDM) respectively and opens and closes reluctance motor (SRM).Their similar, stator are embedded with three-phase (or heterogeneous) winding, and rotor is respectively the prominent utmost point formula structure (to SRM) that permanent magnet (to BCDM) and steel disc build up.When power supply is supplied power to stator winding via the driver of electronic switch composition, produce rotating magnetic field, attract rotor to follow magnetic field and together rotate, so they all are synchronous motors.These two kinds of motors are at household electrical appliance; Light industries such as weaving are existing to be used widely; But the disadvantage that is used as the drive motors of automobile is that its mechanical property is not the required software feature of powered vehicle, but has no the hardware features of the room for maneuver, and its overload and starting capability are also bad.So, though this motor is simple in structure, be easy to maintaining, in order to remedy its shortcoming on performance, have to increase the cost of others.In addition, p-m rotor can demagnetize because of the remagnetization of operation process, but not the suction that magnet rotor can produce then a little less than.We hope to have the automobile-used motor of better cost performance certainly.
AC asynchronous motor not only mechanism is simple, and is durable in use, needs what daily maintaining hardly; And the quite good mechanical property of suitable powered vehicle arranged; Do not have the step-out problem, the overload capacity about having up to three times is so have a kind of the imagination of AC asynchronous motor as vehicula motor; Be exactly to become to exchange dc inversion, utilize ac speed control method again motor speed adjusting.Problem is existing ac speed control method, power factor and decrease in efficiency when rotating speed is turned down, adverse consequencess such as noise increase.
Can use DC power supply; Be interchange without inversion; Through the special driving device,, directly drive asynchronous motor with direct current (not changing direction) electric current? Here at first to solve two key issues: the one, design a kind of direct current of specific waveforms; When it flows through the stator winding of asynchronous machine, can generate the required rotating magnetic field of asynchronous machine operate as normal.Wanting more ben is the rotating magnetic field that makes the asynchronous machine operate as normal required, should be the very uniform magnetic field of rotating speed in the week, and it cannot be sometimes fast and sometimes slow, loiter, or step-type rotation (such rotating magnetic field can be used for synchronous motor).Because asynchronous machine is different with synchronous motor; Its rotor is not to hold rotor magnet by rotating magnetic field to haul its commentaries on classics; But the rotating magnetic field of leaning on stator current to produce; Induced current that the cutting rotor conductor produces in rotation and rotating magnetic field interact and the moment of generation, so be called induction motor again.The rotating speed of rotating magnetic field is always quicker than the rotating speed of rotor when the asynchronous machine operate as normal, and its revolutional slip generally in 5%, refers to rotating speed rather than the mean speed of any moment here.If the rotating speed of rotating magnetic field is sometimes fast and sometimes slow in a week, and rotor does not catch up with the magnetic field change in rotational speed because of very big inertia is arranged, can only change with mean speed.So just might occur, the rotating speed of rotor some period in a week is higher than the rotating speed in magnetic field, makes the induced current of rotor conductor reverse, produces reverse moment, influences the operate as normal of asynchronous machine; The 2nd, design a driver, make the electric current of conventional dc power supply output, can be sent to asynchronous machine by our pattern of regulation, produce the at the uniform velocity magnetic field of rotation.Here also have any to stress, the power supply that is combined into like this is a current source, can not be voltage source.This two problems the present invention just will be set forth emphatically.
Summary of the invention
The present invention uses " control of magnetic potential space vector " that proposed to design the direct current of specific waveforms for three-phase or two-phase induction motor, and when it flow through the stator winding of three-phase or phase asynchronous machine, it was required to produce asynchronous motor work, at the uniform velocity the magnetic field of rotation; Drive unit block diagram and the main circuit structure that utilizes common direct voltage source to generate this direct current also is provided simultaneously.
Description of drawings
Fig. 1 is the magnetic potential polar plot of three-phase dc asynchronous machine;
Fig. 2 is the trajectory diagram of hexagon and circular rotating field pattern;
Fig. 3 is the current waveform figure of hexagon rotating magnetic field pattern;
Fig. 4 is the current waveform figure of circular rotating field pattern;
Fig. 5 is the polar plot of phase asynchronous machine stator electric current magnetic potential;
Fig. 6 is the current waveform of square rotating magnetic field;
Fig. 7 is the formation block diagram of the direct-current driving device of asynchronous motor:
Fig. 8 is the chopped mode main circuit diagram;
Fig. 9 is the scoop-like main circuit diagram;
Figure 10 A is the time domain waveform of trapezoidal stator current;
Figure 10 B is the electromotive force Ed that in stator winding, responded to of corresponding period internal stator and rotor current rotating magnetic field and the waveform of Ez;
Figure 10 C is the space vector Fd and the Fz of stator and rotor current magnetic potential.
1) three-phase dc rotating magnetic field
As three stator winding AX at three-phase asynchronous motor, BY passes through direct current among the CZ
During for maximum, the magnetic potential F that produces respectively
a, F
b, F
c, (being referred to as base vector to them), separately perpendicular to corresponding windings, mutual deviation 120 is spent in the space, and the space vector shown in the available figure (1) is represented.The amplitude of base vector is the possible maximum (stipulating that at present it is 1) of composite magnetic power amplitude that three-phase current produces under the dc condition.When the electric current in each winding was worth for other, the magnetic potential that is generated was used N
a, N
b, N
cExpression, the base vector of its direction and same index is same, and its numerical value is the perunit value of base vector amplitude, such as N
a=0.5 is exactly to represent that electric current is the magnetic potential that a peaked half produces in the A phase winding, like N
a=1, N then
a=F
aTotal composite magnetic power F is that component constitutes with these magnetic potentials.So, fix though constitute the direction of these components of resultant vector F, select the size of different components and component to constitute F, just can make it point in the week direction arbitrarily, and can select the amplitude of F within the specific limits.
How existing research makes composite magnetic power F at the uniform velocity rotate.Whole circumference, with three benchmark magnetic potential vector F
a, F
b, F
cBe divided into ab, bc, three intervals of ca, which interval composite magnetic power F is in, and just synthesizes with defining this interval magnetic potential component.Such as at the interval composite magnetic power F of ab, just use component N
a, N
bSynthesize, interval at bc, just use N
b, N
cSynthesize, interval at ca, just use N
a, N
aCome synthetic.Because change the direction of composite magnetic power F; And F is at the uniform velocity rotated, just must be in certain phase time, to the change of the relative size of these two components; The angle that F can be turned in the space is identical with phase angle, promptly requires the corner of F identical with the phase angle of electric current.This is not at will to select a kind of current waveform just can accomplish and need calculate the Changing Pattern of corresponding magnetic potential component (electric current) according to the variation pattern of the component of selected composite magnetic power F, confirms the waveform of electric current.
A) hexagon rotating magnetic field
The one-component of at present taking fixing composite magnetic power F is when maximum, and the mode of another component of change F makes the F rotation.The composite magnetic power F that generates like this turns over 360 when spending in the space, the track on vector F summit, be size with fiducial value be radius done to justify (shown in the broken circle among Fig. 2) in connect hexagon.
Produce this at the uniform velocity rotating magnetic field electric current waveform as figure (3) shown in.This is a kind of trapezoidal wave electric current, and in the time of the T/6 of each cycle T, electric current rises to maximum I from zero straight line
m, in T/3 subsequently, keep I
mConstant, in T/6, drop to zero then from the Im straight line, in remaining T/3 of a week, remain zero constantly, accomplish the variation in a week.The size of three-phase current is all identical with waveform, mutual deviation 120 degree on phase place.
Can calculate each phase place moment, the value that electric current should be got according to following formula (formula 1) at electric current rising or trailing edge.If the value of electric current was N (normalization numerical value is one with the maximum of electric current or magnetic potential) when phase angle was B, then have:
N＝T
gB/(0.866+0.5T
gB)......(1)
B) circular rotating field
Though the composite magnetic power rotating speed of aforesaid rotating magnetic field is very even, it is constant that its amplitude can not keep, and may cause noise in some applications, vibration and increase loss.Thereby rotating speed is even, and the circular rotating field of amplitude stability is the desirable selections of a lot of occasions.Can notice that in case after the direction of composite magnetic power was confirmed, the ratio of two component amplitudes of forming this composite magnetic power was also just fixed, but the size of its amplitude can change.So, can select the size of two components according to the amplitude of required composite magnetic power, make F keep its constant amplitude when rotated.Certainly, the amplitude of composite magnetic power is conditional, also is not quite similar in the maximum of the composite magnetic power of different directions; The track on composite magnetic power maximum summit in three-phase system, exactly with the base vector amplitude be radius circle in connect hexagon (referring to Fig. 2), wherein; Composite magnetic power Fr perpendicular to each limit of hexagon is minimum; It is 86.6% of a base vector amplitude, can all transfer to the amplitude of other direction composite magnetic power consistent with the amplitude of Fr, the summit track of the composite magnetic power that generates like this; For being the circle of radius, be inscribed within above-mentioned hexagon (the solid line circle among Fig. 2) with the Fr amplitude.
The current waveform that generates circular rotating field is as shown in Figure 4: in one-period T, in the time of time t=0 to T/3 (or phase angle B=0 to 120 degree), electric current I (t) is that a maximum is I
mSine wave, and in the time of t=T/3 to 2T/3 (or phase angle 120 degree is to 240 degree), electric current I (t) be the same sine wave of the above-mentioned sinusoidal wave T/6 of backwardness on phase place, promptly has;
I(t)＝I
mSin(B)＝I
mSin(6.28t/T) 0＜t＜T/3
Or I (t)=I
mSin (B-T/6)=I
mSin (6.28t/T-T/6) T/3＜t＜2T/3 (2)
I(t)＝0 t＜0
In above-mentioned two kinds of rotating magnetic fields, the average magnetic potential of hexagon rotating magnetic field is maximum.Circular rotating field is the most stable, can make the motor operation more steady.
2) direct current two phases (four phases) rotating magnetic field
Two windings of alternating current asynchronous machine stator are orthogonal in the space, if pass to direct current (not changing the electric current of the flow direction), then can only generate two mutually perpendicular benchmark magnetic potential F
aAnd F
b(referring to Fig. 5) serves as that the composite magnetic power F that the basis generates also is limited to F with this biphase current (magnetic potential)
aWith F
bIn the 90 degree spaces of defining.If can forward and reverse each winding be supplied power with specific switching circuit (like bridge circuit); Or be divided into two independently windings (constituting four phase structures) to each phase winding, then can produce 4 benchmark magnetic potentials as shown in Figure 5 and (be respectively F
a, F
b, Fa*=-F
a, F
b*=-F
b) be divided into four quadrants to whole circle.Like this, the resultant vector F of arbitrary direction in the circle, two vector components of all available F place quadrant are formed.
A) circumscribed square rotating magnetic field
If when a phase current (magnetic potential) is maximum (such as the AX phase), keep it constant, and from zero increase adjacent another phase (such as the BY phase) electric current, the summit track of the rotating magnetic potential that is then generated is the circumscribed square (referring to Fig. 5) of basic circle.In a week, every phase current is opened 180 degree (T/2): wherein, rise to maximum time spent T/8 from 0, keep maximum of T/4 times again, reduce to 0 through T/8 from maximum then, and as shown in Figure 6.In the 45 degree phase angles that electric current rises, during corresponding arbitrary phase angle B, the available following formula of the perunit value N that electric current should be got (the maximum Im with electric current is 1) is calculated:
N＝t
gB......(3)
B) circular rotating field
The composite magnetic power F of this system is to form with two mutually perpendicular components, so the amplitude of F can be less than the amplitude of its any composition component.Thereby, can adjust to the amplitude of any direction F identically with the amplitude of benchmark magnetic potential, forming with the basic circle is the circular rotating field (referring to Fig. 5) of track.
Obviously, the winding current that generates this rotating magnetic field is the half-wave sinusoidal current.At two windings of space parallax 90 degree, its electric current also differs from 90 on phase place.
The practical implementation method
The formation block diagram of the direct-current driving device of asynchronous motor, shown in figure (7), wherein 1 is power supply, like storage battery; 2 is motor and its electric current of detection, the detector of rotating speed etc.; The 3rd, controller has holder in its inside, comparator, and components and parts such as amplifier, in order to the current-mode of storing and setting, the cycle of electric current, data such as amplitude.Receive the operating live signal of motor from detector, compare with the setting value of storage, and send the instruction of carrying out corresponding operating based on result relatively.Also have the cycle (rotating speed) of manually setting electric current in the controller, size, the device of phase sequence (turning to) and corresponding display, and have the electric motor starting of providing, braking waits the program of operation; The 4th, driver, the just main circuit of drive unit.
(1) chopped mode main circuit (referring to Fig. 8)
This is a kind of common method of utilizing copped wave principle control circuit electric current.The structure of main circuit is shown in figure (8).Among the figure, AX, BY, CZ are three stator winding of three-phase asynchronous motor, and every phase winding has two sharp K2 of the mains switch K1 that can turn-off, two sustained diode 1, and D2 is connected with the two ends of power supply respectively, also has a Hall element H who measures winding current.The electric current of measuring as H, during less than the value that sets in the memory, controller just sends closed K1 of instruction and K2, makes corresponding windings and power connection, and electric current is risen.When measured current value during greater than set point, the instruction of just sending disconnecting power switch, the electric current in the winding descends through the afterflow of corresponding loop.,, when winding current surpasses setting, only break off K1 and stop electric current to rise for rising or keeping the constant stage at phase current, the electric current in the winding is exponential form and descends through the sharp D2 afterflow of K2.But in the stage of phase current for descending, in order to control its reduction of speed, or discharge the inductive energy storage in the winding, can break off K1 and K2 simultaneously, at this moment the electric current in the winding is returned to power supply to the energy storage in the winding inductance via D2-power positive end-power supply negative terminal-D1 afterflow.Such circuit is also for dynamic brake, and just when the needs abrupt deceleration vehicle, the braking method that is converted into the kinetic energy of vehicle to the electric energy of battery charge provides condition.
(2) scoop-like main circuit (referring to Fig. 9)
The load of sort circuit (three-phase stator winding AX, BY are not direct-connected through switch and power supply CZ), but be connected on an electric capacity that contains certain electric energy (Ca, Cb, Cc) on.These electric capacity also directly and power supply connect, its stored electric energy is the DC/DC converter that can be described as scoop-like through, quantitatively provides with the discrete pulse mode.Such as, when the undertension on the Ca when keeping output current Ia, just start converter; Trigger the K conducting, power supply U charges to C through L1, and (the last voltage of C is about 2U) K turn-offs when charging current reduces to zero; Triggering and conducting Ka subsequently, the power conversion of C charging gained to Ca.In this transfer process; K switch and Ka turn-off under zero current condition, do not have turn-off power loss, and electric current does not interrupt in the energy supplement process; There is not big impact; Obtain the current waveform of expecting more easily, but it need there be two inductance L 1 can bearing big impulse current or voltage, L2 and a capacitor C.
DC asynchronous machine flows through the voltage of the rotating magnetic field that electric current produced of threephase stator winding in the formation of winding two ends when work, be not direct current, but simple alternating current.This alternating current component is being positive half cycle; The electric energy that power supply provides is converted into magnetic energy; And be negative half cycle in alternating current component; Magnetic energy is converted into electric energy, via the feedback loop of the anode A of terminal X (is example with the A mutually)-feedback diode Da-power positive end-power supply negative terminal-output capacitance Ca-winding of winding to power source charges.
The work of DC asynchronous machine
The alternating current asynchronous machine is normally worked under power supply voltage is the sine voltage source condition of certain value, and when load change, its terminal voltage is controlled by power supply, can not change, and only can cause change in current.But DC asynchronous machine can not be used voltage source, and will use the current source supply of certain waveform, and when load change, the electric current that flows through it receives the control of power supply, can not change, and only can cause the variation of voltage, and its terminal voltage will rise with the increase of load.Divide two kinds of situation to analyze its electromagnetic process below:
(1) no-load condition
Zero load is meant motor idle running, and its rotating speed is near synchronous speed, and rotor current is very little, can ignore armature reaction.At this moment the terminal voltage of stator winding is made up of two parts voltage: the first is in the resistance of motor windings and the pressure drop on the winding leakage inductance; It two is the main fluxs that produced by the stator winding electric current, and the electromotive force Ed that in winding, is responded to generates.Because main flux is formed by the electric current comprehensive function of three phase windings, be an at the uniform velocity rotating magnetic field F
dSo the electromotive force Ed of induction is a sine wave in stator winding (is example with A phase winding AX), referring to the figure among Figure 10 (B).If with F
dGo to and F
aBe initial point (t=0) during coincidence, then in the half cycle of t＞0 Ed for just, promptly with winding in sense of current identical, and in the half cycle of t＜0 Ed for negative, promptly with winding in current opposite in direction.Electric current is arranged in the mobile time at the 2T/3 that is paid close attention to ,-need there be corresponding terminal voltage balance with it T/3＜t＜0 in order to overcome back-emf.But at 0＜t＜T/3 is positive potential, and terminal voltage is born, at this moment through feedback loop for the previous period in winding energy stored return power supply.If show stator current with an equivalent sine galvanometer, 90 degree phase differences are arranged between the electromotive force that then this electric current and main flux are responded to, form reactive power.Can when load is low, reduce the amplitude of electric current, to improve power factor.
(2) loading condition
The rotating magnetic field F that stator current produced when motor has load
dOn phase place, fall behind F at the electromotive force of responding on the rotor conductor
d90 degree, if rotor current and induced potential homophase, the magnetic potential F that then rotor current generated
zSpatially also fall behind F
d90 degree are (referring to Figure 10-C), so electromotive force (armature reaction electromotive force) E that in stator winding, is responded to by rotor current
zWith Ed 90 degree phase differences are arranged also, (referring to Figure 10-B), this shows armature reaction electromotive force E
zWhole negative half period face the core of stator current flowing time, the notion sinusoidal from equivalence just means E
zWith electric current anti-phase, balance E
zVoltage and electric current homophase, convert mechanical energy into from the electric energy of power supply output.
But, along with the increase of load, the slip Dn=N1-N2 that the rotational speed N 2 of rotor and the rotational speed N of rotating magnetic field are 1 also can increase, and the electromotive force frequency that causes rotor conductor to be responded to increases, and makes rotor current and corresponding magnetic potential F
zLag behind F
dPhase place increase, Here it is why the torque of asynchronous machine can not rise by straight line even the reason that descends with the increase (increase of rotor current) of slip.
The characteristic of DC asynchronous machine
(1) governor control characteristics
The asynchronous machine that under current this mode, moves, the operation of speed governing is very simple, and the cycle that need only regulate electric current just need not to regulate simultaneously other physical quantity.Because along with the decline of rotating speed, electromotive force Ed and E that rotating magnetic field is responded in stator winding
zThere is corresponding variation in the capital, and Fd can descend (because of F
dChange) this can make power supply in order to the corresponding decline of the reactive voltage component of balance Ed, helps the raising of power factor.As for E
zVariation then relevant with the situation of load in the speed regulation process; If be the speed governing of permanent torque, i.e. the torque of load is constant, then E
zTo reduce with the decline of rotating speed, power supply is in order to balance E
zActive voltage and corresponding output power also descend thereupon; If be constant-power speed regulation, promptly along with the decline of rotating speed, torque is risen accordingly, and the mechanical output of output remains unchanged, and then slip Dn can rise accordingly, makes the induced current or the magnetic potential F of rotor
zRise, compensation is fallen because rotating speed descends to E
zInfluence, and keep E
zConstant, i.e. power balancing E
zThe active voltage component constant, holding power is constant.Here be noted that if under the condition of rated power, do constant-power speed regulation then the electric current of rotor can surmount its rated value after rotating speed descends, and makes motor overload.But how many influences this does not have to the poorest electronic switch that bears overload capacity in the main circuit, and motor to bear the ability of overload be great, this also is the advantage of current this operational mode.
(2) starting characteristic
Plurality of applications occasion (such as electric automobile) needs prime mover that powerful starting torque is arranged, and the asynchronous function of moving under the current this mode satisfies this requirement.The maximum moment Mz that asynchronous machine can generate is about 3 times of its rated moment Me, and the slip Dnz when generating Mz is about 20% of rated speed, and promptly big 4 times than specified slip approximately, corresponding rotor current also can be big about 4 times.When under current this mode, moving, in cycle that can Control current, making and in starting process, remaining slip is Dnz, promptly in starting process, remains moment that motor generates for maximum.Though in can have an appointment 4 times overload of such starting process rotor electric current, the electric current of main circuit, voltage all in normal range (NR), do not have any problem.But if on general PWM device, adopt this start mode; Then all components and parts all will bear about 4 times overload in its main circuit; This almost is difficult to accept, and when regulating power frequency, also wants corresponding regulation voltage, needs more complicated control.
(3) braking characteristic
The braking procedure and the starting process of asynchronous machine are similar, but are to act in a diametrically opposite way.As long as turn down the frequency of electric current, make the rotating speed of rotating magnetic field be lower than the rotating speed of rotor, form negative slip, just can form braking moment.
With the phase sequence that changes electric current, make the simple approach of rotating magnetic field counter-rotating come braking effect and bad, this can make the serious overload of rotor current and braking moment is little.If make the braking moment in the braking procedure remain maximum-Mz, just need come the frequency of Control current according to the actual speed of rotor, slip is remained in whole braking procedure-Dnz.Certainly such braking procedure also makes rotor current that the overload about 4 times is arranged, but to the influence of the main circuit of present mode and little.The mechanical energy that motor discharged in braking procedure is absorbed by power supply through feedback loop.If adopt the PWM pattern, then can produce again and the starting process similar problem.
Characteristics of the present invention and advantage can reduce four words (direct current):
Can use DC power supply to drive cheap and good-quality asynchronous motor and will its inversion not be to exchange;
It has avoided the main circuit components and parts to suffer the risk of short circuit and overload with current source rather than voltage fed.
Claims (3)
1. method that drives asynchronous motor with DC power supply; It is characterized in that: with a kind of specific driver; Make common DC power supply; The direct current of specific waveforms can be provided to the asynchronous motor stator winding, in asynchronous machine, produce the at the uniform velocity rotating magnetic field of rotation, drive asynchronous motor work.Just,, change into, become genuine DC asynchronous motor with the DC current source driving from driving with the AC sine wave voltage source asynchronous motor.
2. a three-phase dc electric current is characterized in that: when it flows through the threephase stator winding of threephase asynchronous, can in motor, produce the at the uniform velocity magnetic field of rotation.The present invention provides the rotating magnetic field of two kinds of three-phase systems: a kind of is its track to connect hexagon in the basic circle, generates the current waveform of this rotating magnetic field; The track of another kind of rotating magnetic field is circular, is inscribed within above-mentioned hexagon, generates the current waveform of this rotating magnetic field.
3. a phase direct current is characterized in that: when it flows through the stator winding of four phase motors, can produce the at the uniform velocity magnetic field of rotation.Rotating magnetic field provided by the present invention has two kinds: a kind of is to be the rotating magnetic field of track with the basic circle; The current waveform that generates this rotating magnetic field is that half-wave is sinusoidal: the track of another kind of rotating magnetic field is the external square of basic circle, generates the current waveform of this rotating magnetic field.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100624088A CN102684591A (en) | 2011-03-14 | 2011-03-14 | Direct current (ZLDL) asynchronous motor |
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|---|---|---|---|
| CN2011100624088A CN102684591A (en) | 2011-03-14 | 2011-03-14 | Direct current (ZLDL) asynchronous motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001431A (en) * | 2012-12-10 | 2013-03-27 | 张加胜 | Direct-current asynchronous motor and driving control method |
| CN103325943A (en) * | 2013-05-16 | 2013-09-25 | 京东方科技集团股份有限公司 | Organic thin-film transistor and preparation method thereof |
| WO2018023892A1 (en) * | 2016-08-05 | 2018-02-08 | 曹兵 | Direct current drive method and system for alternating current motor, and synchronous motor using the system |
-
2011
- 2011-03-14 CN CN2011100624088A patent/CN102684591A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001431A (en) * | 2012-12-10 | 2013-03-27 | 张加胜 | Direct-current asynchronous motor and driving control method |
| CN103325943A (en) * | 2013-05-16 | 2013-09-25 | 京东方科技集团股份有限公司 | Organic thin-film transistor and preparation method thereof |
| WO2018023892A1 (en) * | 2016-08-05 | 2018-02-08 | 曹兵 | Direct current drive method and system for alternating current motor, and synchronous motor using the system |
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Application publication date: 20120919 |