CN206472014U - The supersynchronous governing system of brushless dual-feed motor - Google Patents
The supersynchronous governing system of brushless dual-feed motor Download PDFInfo
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- CN206472014U CN206472014U CN201621482636.5U CN201621482636U CN206472014U CN 206472014 U CN206472014 U CN 206472014U CN 201621482636 U CN201621482636 U CN 201621482636U CN 206472014 U CN206472014 U CN 206472014U
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Abstract
The utility model discloses the supersynchronous governing system of brushless dual-feed motor, governing system includes power supply, brushless double-fed machine stator, brushless double-fed machine rotor, transformer, rectifier, frequency converter, starting resistance, driver element, controller, switch K1And switch K2；Two sets of independent three-phase symmetric windings, respectively main winding and auxiliary winding are placed in the core slots of stator, the outlet terminal of main winding is connected with power supply, the outlet terminal of auxiliary winding is by switch K2, frequency converter, rectifier, transformer be connected with power supply；During motor starting process, K is switched1Closure, auxiliary winding seals in starting resistance, K2Disconnect, the connection of cut-out frequency converter and auxiliary winding；When motor speed is close to synchronous rotational speed, K1 is disconnected and K2 is closed, and auxiliary winding cuts off starting resistance and connects frequency converter.The utility model carries out supersynchronous unidirectional speed governing only more than synchronous rotational speed, and auxiliary winding does not need energy feedback link, therefore the cost of required frequency converter is relatively low.
Description
Technical field
The utility model is related to Speed Adjustment of AC Motor, the more particularly to supersynchronous governing system of brushless dual-feed motor.
Background technology
Existing speed regualtion of AC motor mode mainly has two classes, and it by variable-frequency power sources is that stator winding is powered regulation that a class, which is,
Motor speed, this kind of mode of speed regulation be applied to synchronous motor (electric excitation synchronous motor, permagnetic synchronous motor, reluctance motor etc.) and
Cage-type induction machine；Another kind of is wound-rotor induction machine stator winding and rotor windings respectively by fixed power frequency supply and change
The doubly-fed adjustable speed mode that frequency power is powered；The advantage of the first mode of speed regulation is highly versatile, and control is flexible, has the disadvantage that needs are complete
Power variable-frequency power sources, particularly high-voltage motor governing system cost are higher；Wound-rotor induction machine doubly-fed adjustable speed mode it is excellent
Point is that required variable-frequency power sources power is smaller and control system cost is relatively low, has the disadvantage that wound rotor winding power passes through slip ring
With brush, it is necessary to which periodic maintenance and operational reliability are slightly worse；In order to overcome the disadvantages mentioned above of winding rotor motor doubly-fed adjustable speed, again
Occur in that and rotor controling winding is moved on into a kind of new brushless dual-feed motor mode of speed regulation that stator gets on.
Being used the speed adjustable range of conventional brush-less double feedback electric engine from (super same to synchronous speed is higher than less than synchronous speed (metasynchronism) more
Step) so-called " bidirectional speed governing " mode, although the power of required frequency converter can with smaller, but motor and frequency converter cost simultaneously
It is small unlike unidirectional speed governing；Its reason is：
1. from the point of view of the operation logic of brushless dual-feed motor, no matter motor and generator operation mode, metasynchronism speed
The power output of Operational Zone motor is all the difference of main winding (power winding) and auxiliary winding (controling winding) power, the output of motor
Power is smaller and the power of major-minor winding and loss be not small, and causing the efficiency of motor reduces；In supersynchronous operation, motor it is defeated
It is main winding and auxiliary winding power sum to go out power, and winding is fully used, and electric efficiency is higher, therefore brushless dual-feed motor
Operate in supersynchronous speed adjustable range both economical.
2. from the point of view of frequency converter and control technology, brushless dual-feed motor metasynchronism to hypersynchronous " bidirectional speed governing " controls skill
Art is more complicated, it is necessary to which the frequency converter of Bidirectional variable-flow, cost is higher.Brushless dual-feed motor no matter motor and generator operation side
Formula, the phase sequence and power flow direction of three-phase current are opposite in the fast area of metasynchronism and supersynchronous fast area's auxiliary winding (controling winding)
, thus from metasynchronism to the inverter supply of hypersynchronous " bidirectional speed governing " needs " Bidirectional variable-flow ", its hardware and software
Structure and control technology are than only needing " unidirectional speed governing " much more complex.
" bidirectional speed governing " may be smaller than the transducer power needed for " unidirectional speed governing ", but its manufacturing cost will not drop
It is low；Consider manufacturing cost, runnability and reliability, brushless dual-feed motor supersynchronous " unidirectional speed governing " than metasynchronism and
Supersynchronous " bidirectional speed governing " system is more superior.
Main object in view of high-voltage motor governing system is blower fan and pump class fluid machinery, its power output and rotating speed
3 powers be directly proportional, if the ratio between minimum speed and maximum speed are 0.5, its it is minimum with maximum speed when power ratio be
/ 8th of power when power during 0.53=0.125, i.e. minimum speed is only maximum speed, general driving pump and fan is born
Carry motor need not so big speed adjustable range, power regulating range that can be according to required for load determines speed adjustable range, leads to
The appropriate synchronous rotational speed for choosing brushless dual-feed motor is crossed, is realized using supersynchronous " unidirectional speed governing ".
Utility model content
The technical problems to be solved in the utility model is to provide one kind to reduce governing system cost with improving runnability
With reliability and it is suitable for the supersynchronous governing system of brushless dual-feed motor of supersynchronous unidirectional speed governing operation.
To reach above-mentioned purpose, the technical solution of the utility model is as follows：
The supersynchronous governing system of brushless dual-feed motor, governing system includes power supply, and brushless double-fed machine stator is brushless
Double fed electric machine rotor, transformer, rectifier, frequency converter, starting resistance, driver element, controller, switch K1And switch K2；It is fixed
Two sets of independent three-phase symmetric windings, respectively main winding and auxiliary winding, the leading-out terminal of main winding are placed in the core slots of son
Sub- A1、B1、C1It is connected with power supply, the outlet terminal A of auxiliary winding2、B2、C2By switching K2, frequency converter, rectifier, change
Depressor is connected with power supply；Starting resistance is arranged on the outlet terminal A of auxiliary winding2、B2、C2Between frequency converter, K is switched1
Switch for controlling starting resistance；Controller is arranged on the outlet terminal A of main winding1、B1、C1Between frequency converter, driving is single
Member is arranged between controller and frequency converter；During motor starting process, K is switched1Closure, auxiliary winding seals in starting resistance, K2It is disconnected
Open, the connection of cut-out frequency converter and auxiliary winding；When motor speed is close to synchronous rotational speed, K1Disconnect and K2Closure, auxiliary winding excision
Starting resistance and connect frequency converter.
In one embodiment of the present utility model, the governing system also includes motor stator main winding voltage x current and examined
Survey unit, motor stator auxiliary winding voltage and current detecting unit, motor speed and rotor position detection unit, motor stator master around
Group voltage and current detecting unit is arranged on the outlet terminal A of main winding1、B1、C1Between controller；Motor stator auxiliary winding electricity
Current voltage detection unit is arranged on the outlet terminal A of auxiliary winding2、B2、C2Between controller；Motor speed and rotor-position inspection
Survey unit to be connected with controller, for detecting motor speed and rotor-position.
In one embodiment of the present utility model, the main winding number of poles is 2p1, auxiliary winding number of poles is 2p2, main winding
Number of poles with auxiliary winding is unequal, and need to meet following relations：2p2≥2p1+4。
In one embodiment of the present utility model, the brushless double-fed machine rotor is salient wound rotor without slip ring
Brush structure, it is included with p1+p2The rotor core of individual salient pole, rotor core is arranged in rotating shaft, outside the rotor core
P is evenly equipped with edge1+p2Individual inverted trapezoidal groove, is arranged at intervals, salient pole center is provided with the first of half opening between salient pole and inverted trapezoidal groove
Semi-open slot；The both sides of the semi-open slot of salient pole first are provided with least one pair of semi-open slot by symmetry axis of salient pole center line, and half
Open slot includes the second semi-open slot and the 3rd semi-open slot, corresponding in first, second, third semi-open slot of salient pole
The short-circuited coil of multiturn first, second, third is placed, two coil sides of multiturn short-circuited coil are individually positioned in inverted trapezoidal groove
Center line is in the semi-open slot on the Adjacent salient poles of symmetry axis.
In one embodiment of the present utility model, the rotor core is overrided to form by magnetic conduction electrical sheet.
In one embodiment of the present utility model, two sides of each salient pole are parallel, the outer of salient pole and inverted trapezoidal groove
Base is in arc-shaped, its center of arc and rotor core inner circle concentric.
In one embodiment of the present utility model, bottom and the rotor core internal diameter of first, second, third semi-open slot
Between leave a certain distance, the depth of first, second, third semi-open slot with its increase with salient pole distance between center line and
Reduce.
In one embodiment of the present utility model, first, second, third short-circuited coil is separate, does not have on circuit
It is related；Short-circuited coil in the semi-open slot of salient pole first uses double-decker, and a coil side is placed on the first half opening
The upper strata of groove, another coil side is successively placed on short in the lower floor of the semi-open slot of Adjacent salient poles first, first, second semi-open slot
Map, which is used, only places a short-circuited coil side in single layer structure, each semi-open slot.
By above-mentioned technical proposal, the beneficial effects of the utility model are：
1st, due to use supersynchronous speed governing, it is not necessary to energy feedback link, thus required transducer power it is smaller and into
This is relatively low.
2nd, using supersynchronous speed governing, the power output of motor is main winding and auxiliary winding power sum, and winding is obtained fully
Utilize, electric efficiency is higher.
3rd, using salient pole wound rotor brushless dual-feed motor, rotor mmf and magnetic resistance are fully utilized for stator field
Modulation capability, improve the energy converting between mechanical efficiency of brushless dual-feed motor.
4th, by brushless dual-feed motor Stator and Rotor Windings number of poles and the optimization design of structure, brushless dual-feed motor is expanded
Supersynchronous speed adjustable range, realizes higher rotation speed (>=1500r/min) doubly-fed adjustable speed.
5th, brushless dual-feed motor uses multiturn short-circuited coil by rotor, reduces deep bar rotor winding current kelvin effect
The added losses of generation, improve the utilization rate and electric efficiency of rotor windings.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the supersynchronous speed control system structure schematic diagram of the utility model brushless dual-feed motor；
Fig. 2 is the utility model brushless dual-feed motor structural representation；
Fig. 3 is the utility model brushless double feed salient pole wound rotor structural representation；
1st, power supply 2, brushless double-fed machine stator 2a, main winding 2b, auxiliary winding 3, brushless double-fed machine rotor
4th, transformer 5, rectifier 6, frequency converter 7, starting resistance 8, main winding voltage and current detecting unit 9, auxiliary winding voltage electricity
Flow detection unit 10, motor speed and rotor position detection unit 11, driver element 12, controller 13, rotor core
13a, salient pole 13b, inverted trapezoidal groove 14, the first semi-open slot 15, the second semi-open slot 16, the 3rd semi-open slot 17, first
Short-circuited coil 18, the second short-circuited coil 19, the 3rd short-circuited coil 20, rotating shaft；
Fig. 4 is the supersynchronous speed governing main winding Field Oriented Control System theory diagram of the utility model brushless dual-feed motor；
18th, coordinate transformation unit 19, flux linkage calculation device 20, torque calculator 21, idle calculator 22, torque regulation
Device 23, reactive power regulator 24, coordinate converter 25, voltage source PWM inverter drive circuit；
Fig. 5 is the space phase of major-minor winding current vector and main winding magnetic linkage under the utility model main winding field orientation
Relation；
Fig. 6 is the supersynchronous speed governing direct Torque Control theory diagram of the utility model brushless dual-feed motor；
19th, coordinate converter 26, flux linkage calculation device 27, speed regulator 28, torque calculator 29, magnetic linkage crest meter
Calculate device 30, torque controller 31, flux regulating device 32, auxiliary winding voltage vector selector；
Fig. 7 is the relation of brushless dual-feed motor major-minor winding flux linkage vector and auxiliary winding voltage vector；
Fig. 8 is voltage source inverter circuit theory wiring diagram；
Fig. 9 is brushless dual-feed motor auxiliary winding voltage vector；
Figure 10 is the relation of brushless dual-feed motor auxiliary winding voltage vector and current phasor.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect that the utility model is realized are easy to understand, under
Face combines and is specifically illustrating, and the utility model is expanded on further.
Referring to shown in Fig. 1 to Fig. 3, the utility model discloses the supersynchronous governing system of brushless dual-feed motor, governing system
Including power supply 1, brushless double-fed machine stator 2, brushless double-fed machine rotor 3, frequency converter 6, rises transformer 4, rectifier 5
Dynamic resistance 7, driver element 11, controller 12, switch K1And switch K2；Two sets independent three are placed in the core slots of stator
Symmetrical winding, respectively main winding 2a and auxiliary winding 2b, main winding 2a outlet terminal A1、B1、C1It is connected with power supply 1
Connect, auxiliary winding 2b outlet terminal A2、B2、C2By switching K2, frequency converter, rectifier, transformer be connected with power supply 1；
Starting resistance 7 is arranged on auxiliary winding 2b outlet terminal A2、B2、C2Between frequency converter 6, K is switched1For controlling starting resistance
Switch；Controller 12 is arranged on main winding 2a outlet terminal A1、B1、C1Between frequency converter 6, driver element 11 is arranged on
Between controller 12 and frequency converter 6；Transformer 4 is depressured for high-voltage suppling power 1, then by rectifier 5 by industrial frequency AC
Electricity is changed into direct current, then the power supply of voltage and frequency-adjustable is provided through frequency converter 6 to the auxiliary winding 2b of brushless double-fed machine stator；
Detection unit of the present utility model includes main winding voltage and current detecting unit 8, auxiliary winding voltage and current detecting unit 9 and motor
Rotating speed and rotor position detection unit 10, main winding voltage and current detecting unit 8 are arranged on main winding 2a outlet terminal A1、B1、
C1Between controller 12；Auxiliary winding voltage and current detecting unit 9 is arranged on auxiliary winding 2b outlet terminal A2、B2、C2With control
Between device 12；Motor speed and rotor position detection unit 10 are connected with controller 12；Three detection units are operationally divided
Not by real-time monitoring signals supply controller 12, instruction is sent by controller 12 and controls the defeated of frequency converter 6 through over-drive unit 11
Go out voltage, frequency, phase sequence and phase；During motor starting process, K is switched1Closure, auxiliary winding 2b seals in starting resistance 7, K2Disconnect,
Cut off frequency converter 6 and auxiliary winding 2b connection；When motor speed is close to synchronous rotational speed, K1Disconnect and K2Closure, auxiliary winding 2b is cut
Frequency converter 6 is connected except starting resistance 7.
The utility model main winding 2a numbers of poles are 2p1, auxiliary winding 2b numbers of poles are 2p2, the number of poles of main winding and auxiliary winding not phase
Deng, and following relations need to be met：2p2≥2p1+4；In order to realize that the doubly-fed adjustable speed of supersynchronous wide scope is run, main winding needs
From few number of poles 2p1, and auxiliary winding uses multi-pole 2p2；When doubly-fed adjustable speed range of operation is smaller, main winding can use many
Number of poles 2p2, and auxiliary winding is using few number of poles 2p1。
The brushless double-fed machine rotor of the utility model be salient wound rotor without slip-ring brush structure, it is included with p1
+p2Individual salient pole 13a rotor core 13, rotor core 13 is overrided to form by the electrical sheet with good magnetic property, rotor
Iron core 13 is arranged in rotating shaft 20, and p is evenly equipped with the outer rim of rotor core 131+p2Individual inverted trapezoidal groove 13b, salient pole 13a are terraced with falling
It is arranged at intervals between shape groove 13b, salient pole center is provided with the first semi-open slot 14 of half opening, each salient pole 13a two sides are put down
OK, salient pole 13a outer and inverted trapezoidal groove 13b bases are in arc-shaped, its center of arc and rotor core inner circle concentric.
The both sides of the first semi-open slot of the utility model salient pole 14 are provided with least one pair of by symmetry axis of salient pole center line
Semi-open slot, semi-open slot includes the effect slotted on the second semi-open slot 15 and the 3rd semi-open slot 16, salient pole, is to utilize to turn
The magnetic resistance of sub- magnetic circuit is oriented to, and magnetic flux is passed through rotor according to optimal path；In first, second, third half opening of salient pole
It is corresponding in groove to placed multiturn the first short-circuited coil 17, the second short-circuited coil 18, the 3rd short-circuited coil 19, multiturn short-circuit line
Two coil sides of circle are individually positioned in the semi-open slot on using inverted trapezoidal groove center line as the Adjacent salient poles of symmetry axis.
Left between the bottom of the semi-open slot of the utility model first, second, third and rotor core internal diameter certain
Distance, to meet the requirement of rotor core strength and rigidity；The depth of first, second, third semi-open slot with its with salient pole
The increase of heart linear distance and reduce, with meet groove for rotor flux guiding requirement.
The short-circuited coil of the utility model first, second, third is separate, is not in contact with circuit；Positioned at salient pole
The first short-circuited coil 17 in one semi-open slot 14 uses double-decker, and a coil side is placed on the upper of the first semi-open slot 14
Layer, another coil side is successively placed on the short-circuited coil in the lower floor of the semi-open slot of Adjacent salient poles first, first, second semi-open slot
A short-circuited coil side is only placed using single layer structure, in each semi-open slot, multiturn short circuit is placed in above-mentioned semi-open slot
The effect of coil, is the magnetic for utilizing the magnetomotive force modulation stator winding current that induced-current is produced in rotor short-circuit coil to produce
；Second, third short-circuited coil can partly be placed or do not placed as needed, and it is more and extremely wide that it is particularly suitable for use in number of poles
The less rotor of size, can simplify rotor manufacture process.
The supersynchronous governing system of the utility model brushless dual-feed motor, main winding 2a connects high voltage power supply 1 during electric motor starting,
Auxiliary winding 2b does not connect frequency converter 6 but by switching K1Connect starting resistance 7, auxiliary winding 2b series connection starting resistance 7 effect be
Reduce the starting torque of the starting current and increase motor in main winding and auxiliary winding, when motor speed is close to synchronous rotational speed, auxiliary winding
2b is by switching K1Cut off starting resistance 7 and by switching K2Frequency converter 6 is connected, by the output voltage and frequency that change frequency converter 6
Rate, controls the rotating speed of brushless dual-feed motor；Due to the unidirectional speed governing only more than synchronous speed, it is not necessary to energy feedback link, therefore institute
The transducer power needed is smaller and cost is relatively low.
It is shown in Figure 4, a kind of main winding magnetic field that the supersynchronous governing system of the utility model brushless dual-feed motor is used
The principle of direct field-oriented control method is as follows：
The analysis of motor vector controlled is general to use d-q rotary coordinate systems, in the analysis of brushless dual-feed motor, d-q ginsengs
Rotary speed selection and the rotating excitation field of main winding current generation for examining coordinate are synchronous more convenient；By main winding and auxiliary winding in reality
Voltage and flux linkage equations in three-phase system are transformed into after d-q synchronous rotating reference frames, voltage, the magnetic linkage of brushless dual-feed motor
With electromagnetic torque equation respectively as shown in formula (1), (2) and (3).
The variable of main winding and auxiliary winding is represented with subscript " 1 " and " 2 " respectively in formula (1), (2) and (3), such as uq1And uq2Difference table
Show the component of voltage of main winding and auxiliary winding on q direction of principal axis in d-q coordinates；r1、r2、L1、L2The respectively resistance of major-minor winding
And self-inductance, LmFor the mutual inductance between main auxiliary winding, p1And p2The respectively number of pole-pairs of major-minor winding, ω1And ω2Based on respectively
The power supply angular frequency of auxiliary winding, p=d/dt is a differential operator.
Selection d-q reference coordinate d direction of principal axis is consistent with the total magnetic linkage direction of main winding, then main winding magnetic linkage only has d axis components
ψd1, and q axis components ψq1=0, on this condition the voltage of brushless dual-feed motor, magnetic linkage and torque equation be simplified, motor
The reactive power of electromagnetic torque and main winding side can be represented with (4) and (5) formula respectively；Main winding is by fixed voltage and frequency
Three phase mains is powered, therefore the magnetic linkage Ψ of main windingd1It is basically unchanged, it is fixed in main winding magnetic field it can be seen from formula (4) and (5)
To under vector control mode, the electromagnetic torque T of brushless dual-feed motoreWith the reactive power Q of main winding1Can be respectively by main winding
The reactive component ψ of magnetic linkaged1, auxiliary winding electric current active component iq2With the reactive component i of main winding currentd1Carry out uneoupled control.
Illustrate the realization of the supersynchronous speed governing main winding field-oriented vector control strategy of brushless dual-feed motor below in conjunction with Fig. 5
Method.
1. the determination of major-minor winding current vector and rotor position angle；
The spatial phase relationship of major-minor winding current vector and main winding magnetic linkage such as Fig. 4 institutes under the conditions of main winding field orientation
Show；According to motor speed and the detection signal of rotor-position sensor 10, it is known that rotor is instantaneously relative to stationary reference coordinate d0
The angular position theta of axler；According to the detected value of main winding voltage and current detecting unit 8, main winding current vector i can be tried to achieve1And its phase
For coordinate d0The angular position theta of axle1；Auxiliary winding current phasor i2Relative to coordinate d0The angular position theta of axle2Can be by rotor position angle θr
With main winding current vector position angle θ1Try to achieve, i.e. θ2=θ1-θr。
2. the determination of main winding magnetic linkage；
According to the detected value of major-minor winding phase current, major-minor winding current component i can be tried to achieve through coordinate transformation unit 18d1With
id2, then obtain main winding magnetic linkage Ψ by (2) formula by flux linkage calculation device 19d1。
3. electromagnetic torque is calculated；
Electromagnetic torque TeCan be according to main winding magnetic linkage Ψd1With auxiliary winding current component iq2By (4) formula by torque calculator 20
Try to achieve.
4. reactive power is calculated；
The reactive power Q of main winding side1Can be according to main winding magnetic linkage Ψd1With main winding current component id1By (5) formula by nothing
Work(calculator 21 is tried to achieve.
5. the determination of auxiliary winding given value of current value；
By torque reference value T* eWith torque calculation value TeCompared to the difference after relatively, by torque controller 22 be changed into it is secondary around
The set-point i of group current torque component* q2；By reactive power set-point Q1 *With calculated value Q1Compared to the difference after relatively, by idle
Power governor 23 is changed into the set-point i of the auxiliary winding reactive component of current* d2；
6. auxiliary winding phase current is given and its controls；
According to the auxiliary winding given value of current value i in d-q axial coordinate systems* q2And i* d2And current phasor angular position theta2, warp
The set-point i of auxiliary winding phase current can be tried to achieve by crossing coordinate converter 24* a2、i* b2And i* c2；Pass through the voltage source PWM of controlled current flow
Inverter driving circuit 25, i is pressed through frequency converter 4* a2、i* b2And i* c2The required auxiliary winding phase current of control.
The main winding field-oriented vector control that the supersynchronous governing system of the utility model brushless dual-feed motor is used, chooses
The direction of d-q-n reference coordinate d axles is consistent with the direction of the total magnetic linkage of main winding, then main winding magnetic linkage only has d axis components, and q axles
Component is zero, and the electromagnetic torque (electromagnetic power) and reactive power of brushless dual-feed motor can be respectively by auxiliary winding electricity on this condition
The active component and reactive component of stream carry out uneoupled control；It can make the supersynchronous governing system of brushless dual-feed motor that there is good move
Step response.
Referring to shown in Fig. 6 and Fig. 7, another motor that the supersynchronous governing system of the utility model brushless dual-feed motor is used
Direct Torque Control, its operation principle is as follows：
Handy magnetic linkage table is solved using the brushless dual-feed motor flux linkage equations (2) in d-q synchronous rotating reference frames
The i shownq2And id2Expression formula, is then substituted into formula (3), can the electricity that represents of handy major-minor winding magnetic linkage
Magnetic torque expression formula (6)：
Obviously (6) formula right-hand member can use major-minor winding flux linkage vector ψ1And ψ2Cross product represent, i.e.,
P in formula1And p2The respectively number of pole-pairs of major-minor winding；L1、L2And LmSelf-induction and mutual inductance for main winding and auxiliary winding；|ψ1|
With | ψ2| it is respectively the mould of main winding and auxiliary winding flux linkage vector, δ is the angle between main winding and auxiliary winding flux linkage vector；Because main winding is used
The power supply of fixed amplitude and frequency is powered, therefore voltage u1Amplitude it is constant, main winding resistance drop is relative to main winding voltage very
It is small, it can thus be assumed that main winding magnetic linkage amplitude is basically unchanged；By (7), formula can be seen that：If the amplitude of auxiliary winding magnetic linkage can be made
It is constant, then can be by controlling the angle δ of major-minor winding magnetic linkage come the torque of controlled motor, therefore δ can be referred to as angle of torsion；As long as
The amplitude and angle of torsion of auxiliary winding magnetic linkage are adjusted according to certain rule, with regard to required torque can be obtained；Brushless dual-feed motor
Auxiliary winding is generally powered by voltage source inverter, and it simplifies the mode of connection as shown in fig. 7, wherein electronic power switch device is managed
Look on the bright side of things pass Sa, Sb, ScRepresent.Define Sa=1 expression A phase windings switch on power Udc, access failure power supply Sa=0；SbAnd ScIt is similar fixed
Justice；Auxiliary winding phase voltage instantaneous value is represented by：
The relation of auxiliary winding magnetic linkage and voltage is：
ψ2=∫ (u2-r2i2)dt (9)
Such as ignore the influence of auxiliary winding resistance drop, and (9) formula is subjected to sliding-model control, then auxiliary winding flux linkage vector can
It is expressed as：
ψ2=u2Δt+ψ20 (10)
ψ in formula (10)2And u2Respectively the auxiliary winding magnetic linkage and voltage vector of t, ψ20For t0Moment auxiliary winding magnetic linkage,
Δ t=t-t0；Relation between above-mentioned vector is as shown in Figure 8, it can be seen that by suitably choose auxiliary winding voltage vector and
Time interval Δ t, between the amplitude and auxiliary winding flux linkage vector and main winding flux linkage vector that just can control auxiliary winding magnetic linkage
Angle δ, i.e. controlled motor electromagnetic torque.The selection of auxiliary winding voltage vector is by Sa, Sb, ScThree switch to realize,
There can be 8 kinds of different configuration modes, that is, produce 8 kinds of voltage vectors：u2(0,0,0), u2(0,0,1), u2(0,1,0), u2(0,1,
1), u2(1,0,0), u2(1,0,1), u2(1,1,0), u2(1,1,1)；Wherein, u2And u (1,1,1)2(0,0,0) three are represented respectively
Positive supply and negative supply are connected to when identical, now the phase voltage of auxiliary winding is zero, therefore actual nonzero voltage space vector only has six
Kind, its space vector relation is as shown in figure 9, two of which zero vector voltage is the origin of coordinates.Auxiliary winding voltage vector, which is chosen, to be needed
It is to be understood that the power flow direction of auxiliary winding, auxiliary winding absorbs active power, auxiliary winding electricity under the supersynchronous electric motor with speed method of operation
The angle of pressure and current phasor is less than 90 °, and metasynchronism it is fast when auxiliary winding active power of output, auxiliary winding voltage and current vector
Angle be more than 90 °, therefore can according to the relation of voltage x current vector angle choose auxiliary winding voltage vector；Accompanying drawing 10 is pair
The spatial relationship schematic diagram of winding magnetic linkage, voltage and current vector, in supersynchronous speed operation, will make auxiliary winding voltage and electric current
Angle between vector is less than 90 °, for auxiliary winding current phasor i in Figure 102Position angle, u should be chosen2(0,0,1), u2(0,1,
1), u2(0,1,0) voltage vector in.
Illustrate the implementation method of the supersynchronous speed governing Strategy of Direct Torque Control of brushless dual-feed motor below in conjunction with Fig. 6.
1. motor speed set-point n*The speed difference obtained compared with speed feedback value n shape after speed regulator 27
Into the set-point of torque
2. torque actual value TeCoordinate converter 19, flux linkage calculation device 26 can be passed through with major-minor winding voltage current measurement value
Tried to achieve with torque calculator 28；
3. torque reference valueWith actual value TeAfter comparing the selection of auxiliary winding voltage vector is given through torque controller 30
Device 32；
4. auxiliary winding magnetic linkage amplitude │ ψ2│ can pass through coordinate converter 19, magnetic linkage width according to auxiliary winding voltage and current measurement value
Value calculator 29 is tried to achieve, with magnetic linkage amplitude set-point │ ψ* 2│ is compared delivers to auxiliary winding voltage vector by flux regulating device 31 more afterwards
Selector 32；
5. auxiliary winding current vector angle θ2It can be sweared according to auxiliary winding voltage and current measurement value by coordinate converter 19, electric current
Amount calculator 26 is tried to achieve, and is then sent to auxiliary winding voltage vector selector 32；
6. the requirement that auxiliary winding voltage vector selector 32 can increase and decrease according to auxiliary winding magnetic linkage amplitude and torque, is determined selected
Auxiliary winding voltage vector.
The Strategy of Direct Torque Control that the supersynchronous governing system of brushless dual-feed motor described in the utility model is used, can pass through
It is appropriate to choose auxiliary winding voltage vector and time interval, the amplitude and angle of torsion of auxiliary winding magnetic linkage are just can control, i.e., is directly controlled
The torque of motor processed；Direct Torque Control solves complicated calculations in field-oriented vector control and easily joined with control characteristic by motor
The problem of number change influence, have the advantages that system architecture is simple, torque response is fast and robustness is good.
General principle of the present utility model and principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the utility model spirit and scope are not departed from, the utility model is also
Various changes and modifications are had, these changes and improvements are both fallen within the range of claimed the utility model.The utility model
Claimed scope is by appended claims and its equivalent thereof.
Claims (8)
1. the supersynchronous governing system of brushless dual-feed motor, it is characterised in that governing system includes power supply, brushless dual-feed motor
Stator, brushless double-fed machine rotor, transformer, rectifier, frequency converter, starting resistance, driver element, controller, switch K1With
And switch K2；Placed two sets of independent three-phase symmetric windings, respectively main winding and auxiliary winding in the core slots of stator, it is main around
The outlet terminal A of group1、B1、C1It is connected with power supply, the outlet terminal A of auxiliary winding2、B2、C2By switching K2, frequency converter,
Rectifier, transformer are connected with power supply；Starting resistance is arranged on the outlet terminal A of auxiliary winding2、B2、C2With frequency converter it
Between, switch K1Switch for controlling starting resistance；Controller is arranged on the outlet terminal A of main winding1、B1、C1With frequency converter it
Between, driver element is arranged between controller and frequency converter；During motor starting process, K is switched1Closure, auxiliary winding seals in starting
Resistance, K2Disconnect, the connection of cut-out frequency converter and auxiliary winding；When motor speed is close to synchronous rotational speed, K1Disconnect and K2Closure,
Auxiliary winding cuts off starting resistance and connects frequency converter.
2. the supersynchronous governing system of brushless dual-feed motor according to claim 1, it is characterised in that the governing system is also
Including motor stator main winding voltage and current detecting unit, motor stator auxiliary winding voltage and current detecting unit, motor speed and
Rotor position detection unit, motor stator main winding voltage and current detecting unit is arranged on the outlet terminal A of main winding1、B1、C1
Between controller；Motor stator auxiliary winding voltage and current detecting unit is arranged on the outlet terminal A of auxiliary winding2、B2、C2With control
Between device processed；Motor speed and rotor position detection unit are connected with controller, for detecting motor speed and rotor-position.
3. the supersynchronous governing system of brushless dual-feed motor according to claim 1, it is characterised in that the main winding number of poles
For 2p1, auxiliary winding number of poles is 2p2, the number of poles of main winding and auxiliary winding is unequal, and need to meet following relations：2p2≥2p1+
4。
4. the supersynchronous governing system of brushless dual-feed motor according to claim 1, it is characterised in that described brushless double-fed
Machine rotor be salient wound rotor without slip-ring brush structure, it is included with p1+p2The rotor core of individual salient pole, rotor core
In rotating shaft, p is evenly equipped with the outer rim of the rotor core1+p2Individual inverted trapezoidal groove, is spaced between salient pole and inverted trapezoidal groove
Set, salient pole center is provided with the first semi-open slot of half opening；The both sides of the semi-open slot of salient pole first are provided with salient pole center line
For at least one pair of semi-open slot of symmetry axis, semi-open slot includes the second semi-open slot and the 3rd semi-open slot, the of salient pole
First, it is corresponding in second, third semi-open slot to placed the short-circuited coil of multiturn first, second, third, multiturn short-circuited coil
Two coil sides are individually positioned in the semi-open slot on using inverted trapezoidal groove center line as the Adjacent salient poles of symmetry axis.
5. the supersynchronous governing system of brushless dual-feed motor according to claim 4, it is characterised in that the rotor core by
Magnetic conduction electrical sheet is overrided to form.
6. the supersynchronous governing system of brushless dual-feed motor according to claim 4, it is characterised in that the both sides of each salient pole
Side is parallel, and the outer and inverted trapezoidal bottom land side of salient pole are in arc-shaped, its center of arc and rotor core inner circle concentric.
7. the supersynchronous governing system of brushless dual-feed motor according to claim 4, it is characterised in that first, second, third
A certain distance, the depth of first, second, third semi-open slot are left between the bottom of semi-open slot and rotor core internal diameter
Reduce with its increase with salient pole distance between center line.
8. the supersynchronous governing system of brushless dual-feed motor according to claim 4, it is characterised in that first, second, third
Short-circuited coil is separate, is not in contact with circuit；Short-circuited coil in the semi-open slot of salient pole first is tied using double-deck
Structure a, coil side is placed on the upper strata of the first semi-open slot, and another coil side is successively placed on the semi-open slot of Adjacent salient poles first
Short-circuited coil in lower floor, first, second semi-open slot, which is used, only places a short-circuit line in single layer structure, each semi-open slot
Enclose side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621482636.5U CN206472014U (en) | 2016-12-30 | 2016-12-30 | The supersynchronous governing system of brushless dual-feed motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655687A (en) * | 2016-12-30 | 2017-05-10 | 上海同慈特种电机技术有限公司 | Brushless double-fed motor super-synchronization speed control system and motor field orientation vector control method and motor direct torque control method for brushless double-fed motor super-synchronization speed control system |
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2016
- 2016-12-30 CN CN201621482636.5U patent/CN206472014U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655687A (en) * | 2016-12-30 | 2017-05-10 | 上海同慈特种电机技术有限公司 | Brushless double-fed motor super-synchronization speed control system and motor field orientation vector control method and motor direct torque control method for brushless double-fed motor super-synchronization speed control system |
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