CN106953439A - Brushless dual-feed motor series parallel type cage type rotor structure and winding method - Google Patents
Brushless dual-feed motor series parallel type cage type rotor structure and winding method Download PDFInfo
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- CN106953439A CN106953439A CN201710308955.7A CN201710308955A CN106953439A CN 106953439 A CN106953439 A CN 106953439A CN 201710308955 A CN201710308955 A CN 201710308955A CN 106953439 A CN106953439 A CN 106953439A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/26—Rotor cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/08—Forming windings by laying conductors into or around core parts
- H02K15/09—Forming windings by laying conductors into or around core parts by laying conductors into slotted rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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Abstract
The invention discloses a kind of brushless dual-feed motor series parallel type cage type rotor structure and winding method, multiple rotor nests along iron core circumference uniform distribution are included in rotor core, each rotor nest is made up of multiple loops, multiple loops of each rotor nest are set from inside to outside, at least in the presence of two coil groups being arranged in juxtaposition in each rotor nest, be separated from each other independence between coil group, no electrical connection；At least one coil group is the tandem compound connected by two or more adjacent loops and voluntarily closed.This cage-type rotor can improve the runnabilities such as the operational efficiency and power factor of BDFM model machines, and whole rotor current distribution is relatively balanced, and rotor mmf tends to Sine distribution, and harmonic content is relatively low.
Description
Technical field
The present invention relates to brushless dual-feed motor, and in particular to the series parallel type cage type rotor structure of brushless dual-feed motor and around
Method processed, belongs to frequency control driving field and variable speed constant frequency generator field.
Background technology
Typically two sets have been embedded on brushless dual-feed motor (Brushless Doubly-Fed Machine, BDFM) stator not
With the independent three-phase symmetric winding of number of poles, wherein the referred to as power winding being joined directly together with power network, what is be connected with frequency converter is referred to as
Controling winding.Two sets of stator winding produce the rotating excitation field of different numbers of poles, electromagnetic coupled are realized by rotor, so as to realize electromechanics
The conversion of energy.Therefore, the electromagnetic coupled ability of rotor structure is to determine BDFM runnabilities, power density and popularization and application
Key factor.
Common BDFM rotor structures pattern mainly has three kinds, i.e. cage modle, winding-type, magnetic barrier type.From the point of view of manufacturing process,
Cage-type rotor is the simplest, and magnetic barrier type and wound rotor are complex；From the point of view of magnetic field modulation effect, the magnetic barrier of axial lamination
Preferably, wound rotor takes second place type rotor, and cage-type rotor is poor.For cage-type rotor, according to whether with public cage bar and public
End ring, can be divided into four kinds：(a) without public cage bar without public end ring；(b) with public cage bar without public end ring；(c) with public end ring
Without public cage bar；(d) with public cage bar and public end ring.BDFM cage-type rotors have preferable starting capability and asynchronous operation energy
Power, can use the rotor manufacture process for being similar to traditional induction machine, suitable for large-size machine, cause domestic and foreign scholars to be closed extensively
Note.
However, rotor field modulation effect is not good, the runnability difference such as efficiency is still that restriction cage-type rotor BDFM is promoted
Using key factor.Compared with regular alternating current motor, cage-type rotor BDFM structures are special, set in electromagnetic coupled mechanism and its structure
In terms of meter, still there are some basic theories and key technical problem still to require study solution, the electromagnetic coupled relation ten inside BDFM
Divide complexity, analysis of its cage-type rotor geometry relevant parameter to magnetic field modulation influential effect be not still deep enough, and conclusion is simultaneously
Do not obtain completely the same.Cage type rotor structure pattern is various, and rotor field tune is being improved for how deeply to excavate cage-type rotor
Potentiality in terms of effect processed, so that the research for improving BDFM runnabilities is not still deep enough and comprehensive.
Abroad, British scholar analyzes rotor bar number, sliver span etc. based on equivalent circuit parameter method and cage modle is turned
The influence of sub- impedance parameter, and 1 250kW cage-type rotor BDFM is have developed, its efficiency and power factor are up to more than 90%；
Brazilian scholar's research Wound-rotor type cage-type rotor, rotor slot non-uniform Distribution, adjacent rotor nest outer shroud coil shares a groove, real
Test and show rated efficiency up to 90%；Iranian scholar proposes tandem cage-type rotor, and experiment shows rotor model machine operation effect
Rate is 76.6%.At home, China Mining University proposes a kind of equidistant cage-type rotor, equal per each loop pitch of nest, sensing
Electromotive force is equal in magnitude, and loop current is uniform in size；Shenyang University of Technology proposes the new mixing that magnetic barrier is combined with cage bar
Radial direction lamination armature structure, experiment shows that the power output of the rotor model machine is averagely higher by 17% than magnetic barrier formula reluctance rotor；Weight
University scholar is celebrated by theory analysis, cage-type rotor BDFM magnetic field modulation mechanism is elaborated, finite element analysis shows, to magnetic field
What modulation played a major role is outer short-circuited conducting sleeve, can strengthen useful harmonic field by adjusting the distribution of rotor short-circuit ring, suppress
Useless harmonic field.In summary, BDFM cage-type rotors manufacturing process is simple, and structural shape flexibly, is run for improving BDFM
Performance, can dig with larger potentiality.
As can be seen here, a variety of various forms of trials can be carried out to BDFM cage type rotor structures, such as magnetic resistance is mixed with short-circuited conducting sleeve
Mould assembly, equidistant cage modle and series connection cage modle etc..However, cage-type rotor BDFM magnetic field modulation effect is not changed significantly at present
Kind, magnetic field modulation general principle is not yet illustrated completely, and the problem of runnability such as efficiency is poor is still present, and is turned for BDFM cage modles
The research of son and its Transform Type design also lacks consistent conclusion, and cage type rotor structure is various informative, is adjusted improving rotor field
Still there are larger potentiality in terms of effect processed, raising motor operation performance.Therefore, cage type rotor structure Transform Type design still for be worth into
The problem of one step research.
The content of the invention
For deficiencies of the prior art, it is an object of the invention to propose a kind of brushless dual-feed motor series parallel type
Cage type rotor structure, this cage-type rotor can improve the runnabilities such as the operational efficiency and power factor of BDFM model machines.
The present invention simultaneously the special construction rotor coiling method is also provided, with solve the series-parallel connection cage-type rotor coiling inconvenience,
The problem of insulating properties are not good, not prison welding is leaned on.
The technical proposal of the invention is realized in this way：
Brushless dual-feed motor series parallel type cage type rotor structure, includes multiple turning along iron core circumference uniform distribution in rotor core
Sub- nest, the quantity of rotor nest is relevant with the number of poles cooperation of correspondence stator double winding, and each rotor nest is made up of multiple loops, often
Multiple loops of individual rotor nest are set from inside to outside, and the corresponding closing coil in any one loop is returned positioned at outer ring adjacent thereto
In the corresponding closing coil in road；It is characterized in that：At least in the presence of two coil groups being arranged in juxtaposition, coil group in each rotor nest
Between be separated from each other independence, no electrical connection；At least one coil group is connected simultaneously by two or more adjacent loops
The tandem compound voluntarily closed.
Preferably, rotor totally 32 core slots and 4 rotor nests, per 4 loops of nest, each loop takes two grooves；By interior
Outwards it is followed successively by the first loop, second servo loop, tertiary circuit and the 4th loop；Wherein the first loop and second servo loop are in series
First tandem compound, tertiary circuit and the 4th circuit in series constitute the second tandem compound；First tandem compound and the second series connection group
Close without electrical connection ground independently of one another.
Above-mentioned brushless dual-feed motor series parallel type cage type rotor structure winding method, for the tandem compound involved by rotor nest
In two loops, according to its length and grooved size, in advance by complete annealed copper wire one long round and round continuous coiling into
Matrix, the number of turns until reaching needs, the length often enclosed is the length sum of two loop copper cash in tandem compound, obtains transversal
The thick line circle that face is matched with rotor slot cross-sectional area, the thick line circle only has two wire outlet ends；Returned according to two in tandem compound
The topological structure on road, by constitute the matrix thick line circle intermediate groove portion U-shaped coil by symmetrical center line overturn 180 ° and its
The motionless mode of remaining coil is folded, so as to form the tandem compound of needs, further along rotor notch by Manufactured series connection
In the embedded respective rotor core slots of combination, then the coil in two loops that tandem compound is related to is spatially only overlapping intersects one
It is secondary, it is last two wire outlet ends of thick line circle only to be welded so that the loop connected voluntarily is closed.
Compared with prior art, the present invention has the advantages that：
1st, by the loop each connected inside and outside series parallel type rotor is separated from each other, it is to avoid the larger electric current of outer shroud is forced
Flow through inner ring loop and increase the equivalent resistance of rotor.Therefore, rotor equivalent resistance of the present invention is relatively low, can make rotor winding current
Caused winding copper loss reduces.
2nd, two loop currents that the present invention is in series are equal, and the loop current amplitude difference of interior loong shunt is smaller, whole to turn
Electron current distribution is relatively balanced, and rotor mmf tends to Sine distribution, and harmonic content is relatively low.
3rd, series parallel type cage-type rotor of the present invention has declined stator winding current during the operation of BDFM model machines, efficiency and power
Factor is significantly improved, and temperature rise is relatively low during operation, being capable of long-time run with load.
4th, series parallel type cage-type rotor BDFM model machines of the present invention reduce rotor slot number, simplify structure, reduce difficult processing
Degree and manufacturing cost.
Brief description of the drawings
Fig. 1-series parallel type of the present invention cage-type rotor winding schematic diagram.
The structural representation of Fig. 2-rotor 1.
Fig. 3-per rotor nest magnetomotive force oscillogram.
Fig. 4-BDFM magnetic Miyun figure distribution maps.
Fig. 5-zero load air gap magnetic density waveform figure.
Fig. 6-air gap flux density spectrum analysis figure.
Fig. 7-nrWinding current figure is controlled during=600r/min.
Fig. 8-controling winding simulated current spectrum analysis figure.
Fig. 9-per rotor nest short-circuited conducting sleeve map of current.
Figure 10-asynchronous operation performance comparison figure.
Figure 11-synchronization varying duty performance comparison figure.
Figure 12-no-load current comparison diagram.
Figure 13-nrPower winding actual measurement voltage and current waveform figure during=600r/min.
Figure 14-nrControling winding measured current comparison of wave shape figure during=600r/min.
Figure 15-controling winding measured current spectral contrast figure.
Figure 16-dead load variable-speed operation performance comparison figure.
Figure 17-supersynchronous nrVarying duty performance comparison figure during=900r/min.
Figure 18-metasynchronism nrVarying duty performance comparison figure during=600r/min.
Figure 19-supersynchronous nrPower factor regulation runnability comparison diagram during=900r/min.
Figure 20-metasynchronism nrPower factor regulation performance comparison figure during=600r/min.
Figure 21-tandem compound of the present invention winding method schematic diagram.
Embodiment
Current research shows, with the increase of rotor nest internal short-circuit number of rings, the enhancing of rotor field modulation effect, rotor harmonic wave
Leakage reactance and resistance reduce, when short-circuit number of rings exceedes certain amount, and rotor core tends to saturation, rotor impedance reduce amplitude also by
Gradually reduce.As short-circuit number of rings increases, short-circuited conducting sleeve pitch in rotor nest, each short-circuited conducting sleeve CURRENT DISTRIBUTION is uneven, and cage modle turns
Sub- winding magnetomotive force non-sine distribution, contains abundant useless harmonic wave magnetomotive force.And due to rotor current skewness, rotor
Conductor equivalent cross-sectional area diminishes, and equivalent resistance is larger, has so both reduced the utilization rate of material, also makes rotor windings heating not
, copper loss during increase BDFM operations.
Therefore, the short-circuit number of rings of rotor nest and span are rationally set, and make rotor current distribution proper, rotor core can be avoided
Supersaturation, reduces its equivalent resistance, improves magnetic field modulation effect, thus improve cage-type rotor BDFM operational efficiency and power because
The runnabilities such as number.
In consideration of it, the present invention proposes a kind of brushless dual-feed motor series parallel type cage type rotor structure, wrapped in rotor core
Containing multiple along iron core circumference uniform distribution and identical rotor nest, the number of poles of the quantity of rotor nest and corresponding stator double winding
Coordinate relevant, each rotor nest is made up of multiple loops, and multiple loops of each rotor nest are set from inside to outside, any one is returned
The corresponding closing coil in road is located in the corresponding closing coil of outside region adjacent thereto；At least have two in each rotor nest
Be separated from each other independence, no electrical connection between the individual coil group being arranged in juxtaposition, coil group；Each coil group can be by two and
The single loop that above adjacent loop is connected and the tandem compound that voluntarily closes or be not involved in is connected, but at least
It is tandem compound to have a coil group.
The core of the present invention is that to have in every rotor nest separate between the coil group that two and the above are arranged in juxtaposition, coil group only
It is vertical, each coil group can be the tandem compound being connected by two and above adjacent loop and voluntarily closed or
The single loop of series connection is not involved in, but at least one coil group is tandem compound.Tandem compound in per nest can only have one
Individual or two, tandem compound quantity is not limited in theory, remaining all loops without series connection with tandem compound each other
It is arranged in juxtaposition.
Preferably, rotor totally 32 core slots and 4 rotor nests, per 4 loops of nest, each loop takes two grooves；By interior
Outwards it is followed successively by the first loop, second servo loop, tertiary circuit and the 4th loop；Wherein the first loop and second servo loop are in series
First tandem compound, tertiary circuit and the 4th circuit in series constitute the second tandem compound；First tandem compound and the second series connection group
Close without electrical connection ground independently of one another, concrete structure is shown in Fig. 1.Series parallel type cage type rotor structure is interior per 4 loops of nest in embodiment
External loop is each connected and voluntarily closed two-by-two, and inside and outside then inner-outer loop is arranged in juxtaposition, equivalent to parallel connection independently of one another, but
In the absence of the electrical connection of conventional parallel, therefore the present invention is referred to as parallel construction, along with tandem compound, therefore is series parallel type.
Two loop currents being in series are equal, and the loop current amplitude difference of interior loong shunt is smaller, and whole rotor current distribution is relatively balanced.
Coiling on series parallel type cage-type rotor：
Using scattered offline scheme.During using offline scheme progress rotor coil processing is dissipated, in a rotor slot
Coil need to be attached closure with the coil of another rotor slot, how to avoid the coil of two rotor slots from concentrating when welding
The problem of existing the end of a thread solder skip, rosin joint, be the subject matter that this series parallel type cage-type rotor need to be solved.Particularly this rotor is related to twice
The series connection on road, if the traditionally directly coiling in rotor slot, per coiling one, circle will produce an intersection, very inconvenient,
Efficiency is also very low.By ruminating over and attempting, following inserting method is finally taken：For the series connection involved by rotor nest
Two loops in combination, according to its length and grooved size, in advance by complete annealed copper wire one long it is continuous round and round around
Matrix is made, the number of turns until reaching needs, the length often enclosed is the length sum of two loop copper cash in tandem compound, is obtained
The thick line circle that cross section is matched with rotor slot cross-sectional area, the thick line circle only has two wire outlet ends；According in tandem compound two
The topological structure in individual loop, will constitute the U-shaped coil of the matrix thick line circle intermediate groove portion by 180 ° of symmetrical center line upset
And the motionless mode of remaining coil is folded, so that the tandem compound of needs is formed, will be Manufactured further along rotor notch
In tandem compound insertion respective rotor core slots, then the coil in two loops that tandem compound is related to is spatially only overlapping intersects
Once, it is last two wire outlet ends of thick line circle only to be welded so that the loop connected voluntarily is closed.Specific coiling side
Method may refer to Figure 21, that is, coil 2 and coil 3 are exchanged into position, the lower section water of correspondingly connected coil 2 and coil 3
Flat coil two ends are exchanged, and the coil 1 and coil 4 of periphery are motionless.Thus insulating properties and the welding of rotor coil can be ensured
Reliability, and such winding method is quick, simple, only once overlapping to intersect, only one of which joint, and efficiency and quality are all
It is improved significantly.
In order to illustrate the technical advantage of this hybrid connected structure rotor, the rotor and existing rotor of the present invention are carried out below as follows
The comparison of universality energy, wherein rotor 1 are existing structure rotor, and rotor 2 is the rotor of hybrid connected structure of the present invention.The knot of rotor 1
Structure is as shown in Fig. 2 rotor 1 is 44 grooves, using the cage type rotor structure with public cage bar and public end ring, totally 4 nests, per nest 6
Individual short-circuited conducting sleeve.The structure of rotor 2 is as shown in figure 1, totally 32 groove, comprising 4 rotor nests, per 4 loops of nest, and inner-outer loop is each two-by-two
Connect and voluntarily close, independently of one another.
First, rotor nest magnetomotive force comparison of wave shape
Fig. 3 is each rotor nest magnetomotive force comparison of wave shape figure.As seen from Figure 3, the magnetomotive force distribution of rotor 2 is close to sinusoidal point
Cloth, magnetic field modulation effect preferably, enhances the useful harmonic field of rotor generation, suppresses useless higher hamonic wave magnetic field.Now,
On the one hand copper loss caused by iron loss caused by harmonic field and harmonic current in BDFM operations can be reduced, motor operation effect is improved
Rate；On the other hand, degree of saturation unshakable in one's determination can be reduced, reduce rotor harmonic leakage reactance, so as to reduce by suppressing the useless harmonic field of rotor
BDFM exciting current, improves power factor；Further, since rotor slot number is reduced, rotor slot-pitch can be increased, rotor is prevented effectively from
There is supersaturation in teeth portion；The rotor being sequentially connected in series for traditional all loops of every nest, it is equal per each cage bar electric current of nest, it can make to turn
The similar Sine distribution of sub- magnetomotive force, magnetic field modulation effect more preferably, but when the larger electric current of outer shroud be forced to flow through middle node away from
During less short-circuited conducting sleeve, the improvement to rotor field modulation effect is not obvious, but make it that rotor loop equivalent length increases, turns
Sub- equivalent electric resistive is big.By contrast, the loop each connected by rotor 2 of the present invention is inside and outside is separated from each other, it is to avoid outside
The larger electric current of ring is forced to flow through inner ring loop and increase the equivalent resistance of rotor.Therefore, the equivalent resistance of rotor 2 is relatively low, can drop
The copper loss that low rotor winding current is produced, improves efficiency.
2nd, finite element comparative analysis
In order to further illustrate the superiority of rotor 2 proposed by the present invention, keep stator structure and its parameter identical, use
Time-step finite element method is calculated and com-parison and analysis two different rotor BDFM model machines, and simulation step length is taken as 0.001s.Power
Winding, which applies, switch to 60V/10Hz negative-phase sequence voltages to power after power-frequency voltage, controling winding short circuit, asynchronous starting 0.4s, empty
Carrying row, rotating speed is stable at 600r/min.A certain moment magnetic Miyun figure distribution is as shown in Figure 4 after stable.
From fig. 4, it can be seen that occurring obvious saturation at 4 in the iron core of rotor 1, it is 1.86T that wherein the most narrow place's magnetic of rotor teeth portion is close；Turn
The degree of saturation unshakable in one's determination of son 2 decreases, and occurs obvious saturation at only two, and it is 1.73T that wherein the most narrow place's magnetic of rotor teeth portion is close.Gas
Gap magnetic flux density waveformses are as shown in figure 5, its result of spectrum analysis is as shown in Fig. 6 and table 1.As can be seen here, except useful in air gap flux density
1, outside 3 magnetic fields, also comprising useless 5,7 inferior harmonic fields, and due to high order caused by the fluting of rotor surface
Slot ripples.By contrast, the fundamental wave content of rotor 2 adds 6.7%, and 3 subharmonic slightly have reduction, and 5,7 useless harmonic contents
Substantially weaken, effectively enhance useful harmonic wave, suppress useless harmonic wave, improve rotor field modulation effect.
The air gap flux density harmonic content of table 1
For the stator winding structure of above-mentioned BDFM model machines, rotor windings produce 5,7 subharmonic magnetic fields will be in controling winding
In be respectively induced out angular frequency for ωp±2ωc、2ωp±ωcElectromotive force and electric current (double winding takes just with phase sequence connection,
Negative-phase sequence connection takes negative), but induced electromotive force can not be produced in power winding, then when rotor speed is 600r/min, control
Frequency is produced in winding processed respectively for 30Hz and 90Hz harmonic waves induced electromotive force and electric current.Controling winding electric current IcWaveform and frequency
Analysis of spectrum result is as shown in Figure 7,8.
During from Fig. 7,8, BDFM stable operations, the distortion of the controling winding current waveform of rotor 1 more apparent, 30Hz and 90Hz
Harmonic current content is larger；The controling winding current waveform of rotor 2 reaches that the stable time is longer, but waveform is closer to just after stabilization
String, higher harmonic content has different degrees of reduction.
For rotor bar electric current, as shown in figure 9, in same rotor nest, each loop current of rotor 1, public cage bar
Current amplitude be much larger than other interior circular currents；And two loop currents that rotor 2 is in series are equal, amplitude is smaller, and inner and outer ring
Difference between current is away from smaller, CURRENT DISTRIBUTION relatively balance.As can be seen here, more preferably, degree of saturation unshakable in one's determination is more for the magnetic field modulation effect of rotor 2
Low, rotor bar CURRENT DISTRIBUTION is more balanced, and can be reduced the iron loss and copper loss when BDFM is run, be improved steady-state operation performance.
Analysis contrast, explanation are carried out to Distribution of Magnetic Field, air gap magnetic density waveform, stator and rotor current etc. using FInite Element above
Series parallel type rotor BDFM model machines of the present invention degree of saturation unshakable in one's determination is relatively low, and rotor field modulation effect is preferable, compared to existing cage modle
Rotor BDFM model machines, the new rotor BDFM model machines of series parallel type have more preferable runnability.
By the loop each connected inside and outside series parallel type rotor is separated from each other, it is to avoid the larger electric current of outer shroud is forced stream
Increase the equivalent resistance of rotor through inner ring loop.Therefore, new rotor equivalent resistance is relatively low, can make caused by rotor winding current
Winding copper loss reduces.
3rd, experimental contrast analysis
In summary, the model machine of rotor 2 has good steady-state operation performance.Therefore, rotor 2 is manufactured experimently, using scattered
Offline processing technology, makes inside and outside series connection and each self-closing two-by-two respectively in 4 loops of the rotor per nest, independently of one another.Two differences
Rotor shares same stator, under identical precondition, two rotor model machines is carried out respectively steady as the multi-state of motor
State runnability contrast experiment.
Make η,The operational efficiency of model machine and the power factor of power winding are represented respectively, wherein：
η=P2/(Pp+Pc)
In formula：P2Represent BDFM rotating shaft output mechanical powers；Pp、PcRepresent that power winding and controling winding power supply are carried respectively
The active power of confession.
3.1 asynchronous experiments
Controling winding direct short-circuit, model machine asynchronous operation.Change load torque TLSize, when measuring model machine asynchronous operation
Varying duty characteristic curve, as shown in Figure 10, wherein IpRepresent power winding current.
During asynchronous operation, BDFM steady-state speed and electric machine structure relating to parameters.As shown in Figure 10, due to rotor structure not
Together, steady-state speed has differences during two rotor model machine asynchronous operations, but still with identical moving law.With load torque
Increase, rotating speed declines, and two rotor model machine power winding currents, power factor, efficiency rise therewith, and load torque is beyond certain
After scope, efficiency is on a declining curve.When applying identical load torque, compared to rotor 1, the work(of the model machine power winding of rotor 2
Rate factor is closer to, but electric current about reduces half, and efficiency is obviously improved.
3.2 synchronous experiments
Controling winding three-phase windings " apply dc source by way of two and a string ", keep DC voltage 35V constant,
Model machine is run simultaneously, and rotating speed perseverance is 750r/min, is not influenceed by load torque.Load torque is adjusted, two rotor model machines is measured and exists
Steady-state characteristic curve during synchronous operation, as shown in figure 11.As can be seen here, with TLIncrease, two rotor model machine power windings electricity
Stream and efficiency are integrally in rising trend, and the efficiency of rotor 2 is higher than rotor 1.For power factor, the model machine of rotor 2 is substantially dominant, substantially
More than 0.8.
3.3 double-feds are tested
Powered by frequency converter to controling winding, when controling winding and the current in phase sequence or negative-phase sequence of power winding,
BDFM is separately operable in double-fed is supersynchronous or metasynchronism state.
3.3.1 unloaded converting operation
Stator winding no-load current size is influenceed by rotor field modulation effect and degree of saturation unshakable in one's determination when BDFM is run.
Output current of frequency converter frequency and phase sequence are adjusted, model machine is run in the full ranges of speeds of 0-1500r/min.Measure two rotor samples
Machine stator winding no-load current with rotating speed change curve, as shown in figure 12.In addition, be two rotor field modulation effects of checking,
Make model machine in metasynchronism 600r/min no-load runnings, under conditions of identical excitation is applied, obtain power winding voltages, current wave
Shape is as shown in figure 13, and controling winding current waveform and its spectrum analysis, as shown in Figure 14,15.
As seen from Figure 12, two rotor model machine speed adjustable ranges are wider, can the stable operation in the range of 0-1500r/min, electricity
Rheology law is roughly the same.Compared with the model machine of rotor 1, the model machine no-load current of rotor 2 is remarkably decreased, and maintains reduced levels；
It is preferable from Figure 13-15, two rotor model machines power winding voltages, current waveform sine degree, and the model machine power winding of rotor 2
Current amplitude is smaller, and 10Hz current component is smaller in controling winding electric current, and 30Hz, 90Hz harmonic current content are relatively low.It is unloaded
Experimental result illustrates that the slot number of rotor 2 is reduced, and rotor core degree of saturation reduction, required exciting current is smaller, and rotor is per nest 4
Connected two-by-two respectively inside and outside individual loop, CURRENT DISTRIBUTION is more balanced so that rotor mmf distribution tends to be sinusoidal, can strengthen useful humorous
Ripple magnetic field, suppresses useless harmonic field, with preferable magnetic field modulation effect, it is possible to increase the performance such as BDFM operational efficiency, symbol
Close hereinbefore theory analysis and result of finite element.
3.3.2 converting operation is loaded
The voltage-frequency of controling winding is set to be adjusted than to make BDFM stable operations, during frequency control.Therefore, power factor and
The variation tendency of efficiency does not have evident regularity, only as the comparison of two rotor model machine steady-state operation performances.Dead load is carried out respectively
(TL=20N.m) speed change and variable load constant speed experiment, relative operating characteristic curve is as shown in figs. 16-18.
As seen from Figure 16, in wide speed range, the efficiency and power factor of rotor 2 have different degrees of lifting, wherein
Improved efficiency effect is the most obvious, and average amount of increase is 30%.From Figure 17,18, in variable load constant speed, two each things of rotor model machine
Reason quantitative change law is basically identical, and by contrast, the efficiency of rotor 2 and power factor have improvement.
Due to BDFM runnabilities and controling winding side, to apply alive voltage-frequency ratio relevant, to make Performance comparision more accurate,
Power factor regulation experiment is carried out below.In dead load constant speed, the voltage-frequency ratio of controling winding is adjusted, performance curve is measured such as
Figure 19, shown in 20.Power factor is with controling winding voltage UcIncrease and rise to 1, work as UcDuring more than certain value, power because
Number will be changed into advanced from delayed, and be gradually reduced, but the model machine stator current of rotor 2 is smaller all the time, and efficiency is higher.
Tested by the development of series parallel type rotor model machine and the steady-state operation performance comparison of two kinds of different rotor structure model machines.
As a result indicating series parallel type cage-type rotor BDFM model machines reduces rotor slot number, simplifies structure, reduces difficulty of processing and system
Cause this；Series parallel type cage-type rotor has declined stator winding current during BDFM model machine load runnings, efficiency and power factor
Significantly improve, temperature rise is relatively low during operation, being capable of long-time run with load.
It is last it should be noted that the examples detailed above of the present invention is only example to illustrate the invention, and not
It is the restriction to embodiments of the present invention.It is right although the present invention is described in detail with reference to preferred embodiment by applicant
For those of ordinary skill in the art, can also make on the basis of the above description other it is various forms of change and
Change.Here all embodiments can not be exhaustive.Every belong to that technical scheme amplifies out aobvious and
Row of the change or variation being clear to still in protection scope of the present invention.
Claims (3)
1. brushless dual-feed motor series parallel type cage type rotor structure, includes multiple rotors along iron core circumference uniform distribution in rotor core
Nest, each rotor nest is made up of multiple loops, and multiple loops of each rotor nest are set from inside to outside, any one loop correspondence
Closing coil be located at the corresponding closing coil of outside region adjacent thereto in；It is characterized in that：In each rotor nest at least
In the presence of two coil being arranged in juxtaposition groups, be separated from each other independence, no electrical connection between coil group；At least one coil group is
The tandem compound connected by two or more adjacent loops and voluntarily closed.
2. brushless dual-feed motor series parallel type cage type rotor structure according to claim 1, it is characterised in that：Rotor totally 32
Core slots and 4 rotor nests, per 4 loops of nest, each loop takes two grooves；Be followed successively by from inside to outside the first loop, second time
Road, tertiary circuit and the 4th loop；Wherein the first loop and second servo loop the first tandem compound in series, tertiary circuit and
Four circuit in series constitute the second tandem compound；First tandem compound and the second tandem compound are independent of one another without electrical connection ground.
3. brushless dual-feed motor series parallel type cage type rotor structure winding method described in claim 1 or 2, it is characterised in that：For
Two loops in tandem compound involved by rotor nest, according to its length and grooved size, in advance by complete soft copper one long
Continuous coiling is into matrix round and round for line, the number of turns until reaching needs, and the length often enclosed is two loops in tandem compound
The length sum of copper cash, obtains the thick line circle that cross section is matched with rotor slot cross-sectional area, and the thick line circle only has two leading-out terminals
Head；According to the topological structure in two loops in tandem compound, the U-shaped coil for constituting the matrix thick line circle intermediate groove portion is pressed
Symmetrical center line overturns 180 ° and the motionless mode of remaining coil is folded, so that the tandem compound of needs is formed, further along
Manufactured tandem compound is embedded in respective rotor core slots by rotor notch, then the coil in two loops that tandem compound is related to
Spatially only overlapping intersection is once, last only to weld two wire outlet ends of thick line circle so that the loop connected
Voluntarily close.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923704A (en) * | 2018-08-14 | 2018-11-30 | 宁德师范学院 | A kind of brushless dual-feed motor transient field simulation analysis system and method |
| CN113300517A (en) * | 2021-05-07 | 2021-08-24 | 华中科技大学 | Scattered wire winding motor and winding transposition method |
| CN114329949A (en) * | 2021-12-26 | 2022-04-12 | 中国大唐集团新能源科学技术研究院有限公司 | Cage type rotor brushless double-fed motor simulation modeling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010081670A (en) * | 2008-09-24 | 2010-04-08 | Denso Corp | Alternating current generator |
| CN102412684A (en) * | 2011-11-04 | 2012-04-11 | 华中科技大学 | Brushless double-feedback motor of winding rotor |
| CN102801266A (en) * | 2012-08-27 | 2012-11-28 | 华中科技大学 | Brushless double-fed motor wound rotor winding and manufacturing method thereof |
| CN103782494A (en) * | 2011-07-15 | 2014-05-07 | 风能科技有限公司 | Brushless doubly fed machines |
-
2017
- 2017-05-04 CN CN201710308955.7A patent/CN106953439B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010081670A (en) * | 2008-09-24 | 2010-04-08 | Denso Corp | Alternating current generator |
| CN103782494A (en) * | 2011-07-15 | 2014-05-07 | 风能科技有限公司 | Brushless doubly fed machines |
| CN102412684A (en) * | 2011-11-04 | 2012-04-11 | 华中科技大学 | Brushless double-feedback motor of winding rotor |
| CN102801266A (en) * | 2012-08-27 | 2012-11-28 | 华中科技大学 | Brushless double-fed motor wound rotor winding and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923704A (en) * | 2018-08-14 | 2018-11-30 | 宁德师范学院 | A kind of brushless dual-feed motor transient field simulation analysis system and method |
| CN113300517A (en) * | 2021-05-07 | 2021-08-24 | 华中科技大学 | Scattered wire winding motor and winding transposition method |
| CN114329949A (en) * | 2021-12-26 | 2022-04-12 | 中国大唐集团新能源科学技术研究院有限公司 | Cage type rotor brushless double-fed motor simulation modeling method |
| CN114329949B (en) * | 2021-12-26 | 2023-08-15 | 中国大唐集团新能源科学技术研究院有限公司 | Simulation modeling method for brushless doubly-fed motor of cage rotor |
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| CN106953439B (en) | 2019-03-12 |
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