CN1335667A - Double-feeding speed varying salient-pole synchronous motor - Google Patents

Abstract

The present invention relates to the motor principle of motor and the improvement of its structure and aims at realizing the speed varying of salient-pole synchronous motor, especially large-scale hydroelectric generating set. The motor of the present invention has stator with the same structure as common AC motor and P pairs of poles, and rotor structure with mP pairs of splited salient magnetic poles and exciting winding comprising m phase and P pairs winding units with m being 2-6. The double-feeding speed varying synchronous motor of the present invention can meet the requirement of large-scale hydroelectric generating set in energy accumulating power generation, second-term development and operation in optimized conditions as well as the requirement of power system to speed varying synchronous motor.

Description

Double-feeding speed varying salient-pole synchronous motor

Technical field

The invention belongs to the improvement of Principle of Electric Engine and structure, particularly salient pole synchronous electric machine.

Background technology

China is one and contains the extremely abundant country of hydropower resources that exploiting water power resources is in the current development of the West Regions of fundamental state policy of national long-run development, development ﹠ construction large quantities of large-scale construction of hydropower facilities projects, particularly hydroenergy storage station.In hydroenergy storage station, when the accumulation of energy unit was used as motor-water pump operation, its rotating speed often required to require synchronous machine to have speed changing function, rotating speed adjustable to be advisable a little more than generator speed.If adopt the transmission synchronization motor, when generator operation, it can make the water wheels function be under the optimum condition all the time, and also can stable operation under underloading, and unlikely generation vibrations.When water pump operation, realize the input power adjustment, control pumping operation mode load, thereby the frequency fluctuation of control electrical network.

In the large hydropower station high dam is built, often wish second-stage development, promptly when weir low water head and high dam high water head, all can generate electricity.Because head changes greatly, the hydraulic turbine is difficult to adapt to its requirement.If adopt the transmission synchronization motor, can adapt to rotational speed of water turbine than great changes, generating improves operating condition while building.

Current China hydropower resources, since environment and ecological destruction, the river high concentration of sediment, and head changes greatly.For a long time, hydraulic turbine industry suffers from that can't to solve flood season silt many, the contradiction of rotary wheel of water turbine type selecting difficulty.The transmission synchronization motor can make the hydraulic turbine no matter flood season or non-flood season be in optimum condition all the time, significantly reduces turbine blade cavitation erosion and sand erosion, has both improved unit efficiency, prolongs unit durability again.By changing rotational speed of water turbine, solve blade cavitation erosion and sand erosion, select optimum runner operating mode operation, its economic benefit is fairly obvious.

Based on of the requirement of above-mentioned Hydropower Unit at the aspects such as optimum operating condition operation of storage station, second-stage development and the hydraulic turbine, in addition, in fields such as wind power generation, tidal power station and naval vessel, aerogenerators, also require a kind of synchronous machine with speed changing function to emerge, this is the needs of the national economic development.

Because development of electric power industry, particularly to the requirement of the automatic control ability of mains frequency (AFC).When system is in underload, carry out reactive power compensation.To meritorious adjusting, the operation of motor angle stability and dynamic response capability thereof, will require higher.In development of the West Regions, transferring electricity from the west to the east, Hydropower Unit, long power transmission line, idle adjusting and compensation etc. all are great problems.If synchronous machine can move in asynchronization, can carry out idle adjusting, will improve power grid quality.This be the power industry of current China the problem that will face, also require the synchronous machine can speed change, i.e. asynchronized synchronous generator for this reason.

On the international conference on large HV electric systems in 1992, the plenary session of the 11st (electric rotating machine) academic board, novel transmission synchronization motor is as the first preferential theme " new development of motor and experience ", the former Soviet Union, state scholars such as Japan have done specialist paper.The development of AC excitation motor and development have caused that common people gaze at.HIT is that the one-tenth of 22MVA goes out (Narude) power station 1# machine and puts into operation in 1987 manufacturing capacity.Toshiba's manufacturing capacity is power station, Yagi spark gap pool (Yagisawa) the 2# machine of 85MVA, puts into operation December nineteen ninety, becomes first the speed change pumped storage in world unit.1994, HIT's manufacturing capacity was that the big Ha Noi of 400MW power station speed change pumped storage unit puts into operation.First 200MW of the former Soviet Union (ASTG-200) asynchronization turbo generator was made in 1985 and is put into operation, finished second in 1991.At present, be engaged in the development of 300MW asynchronization turbo generator set.Since the nineties, for the research of transmission synchronization motor, two kinds of typical electric machine mainly have been divided into both at home and abroad.At first be double-fed AC excitation motor DFIM (Double-FedInduction Machine), be the AC excitation motor of representative promptly, referring to document: Kita E etc.A 400MW Adjustable speed pumped-storagesystem Water power﹠amp with power station, the big Ha Noi of HIT; Dam construction 1991 No.11; Next is double-fed brushless electric machine BDFM (Brushless Double-Fed Machines), with Britain scholar Hunt L.J and Broadway A.R etc. is representative, referring to document: S.Willianmson Generalised theory ofthe brushless doubly-fed machine Part 1:Analysis; Part2 model verificationand pertormance, Proc.IEE Electr.Power Appl.Vol.144 No2 march 1997p111-129.They are applied as the transmission synchronization generator in storage station, field of wind power generation.In recent years, cause relevant research institute, colleges and universities and makers' concern at home.

Should be pointed out that no matter be the double-fed AC excitation motor, or the double-fed brushless electric machine, on essence and structure, they all belong to the asynchronous machine category.The double-fed AC excitation motor, it comes down to wire-wound asynchronous motor, relies on slip power to carry out speed governing.Its stator, promptly armature is identical with the alternating current machine stator, and rotor structure is the wire-wound asynchronous motor rotor.Stator and common three phase mains connect feed, and rotor connects feed by the AC frequency conversion power supply mutually by slip ring, input slip-frequency power supply.Thereby constitute double-fed AC excitation motor DFIM (Double-Fed Induction Machine).For large vertical water turbine generator, particularly in the large energy accumulation unit,, reach tens meters because this rotor diameter is very big, the rotating speed height, centrifugal force is big, causes the end of rotor winding fixing very difficult.For this reason, Japanese scholar has proposed a series of patent of invention technology, takes measures on rotor structure.From the investigation analysis in power station, big Ha Noi, unit converter plant, control system equipment be bulky complex extremely, and the converter plant capacity is big, apparatus expensive, and factory building will increase by a layer height more for this reason, and the unit cost increases 30-40%.From domestic developmental research fork-like farm tool used in ancient China, the unit harmonic content is big, when generating unit speed changes settling time long, the dynamic stability of unit is not good enough.

The double-fed brushless electric machine, it comes down to the squirrel-cage motor of special construction, and rotor adopts mouse cage cover (' nest ' loop) structure.For the brushless reluctance motor of double-fed (Brushless Doubly FedReluctance Machine).Its stator is identical with the alternating current machine stator, has p, q on the stator to different numbers of poles two cover windings, and wherein p connects feed to the winding and the common three phase mains of the utmost point, form main winding, in addition, q connects feed to the winding and the AC frequency conversion power supply of the utmost point, forms speed governing and pays winding.On rotor, lay mouse cage cover (' nest ' loop) structure.It is equivalent on same rotor, respond to different p, q motor respectively, utilize the special construction of rotor mouse cage cover (' nest ' loop), the rotor air-gap field is rotated synchronously the frequency of the utmost point, reaching energy converting between mechanical, thereby form the double-fed brushless electric machine.This motor is because rotor is special mouse cage cover (' nest ' loop) structure, simultaneously, it utilizes the difference of d, q axle magnetic conductance, and it is implemented on Large Hydropower Station, and root diameter will reach tens meters, produce the power of hundreds of thousands kilowatt, structurally also can't realize.Simultaneously, for double-fed AC excitation motor and double-fed brushless electric machine, there are problems in they to the stability of idle adjusting and system, satisfy the requirement of Large Hydropower Station for transmission synchronization, and suitable difficulty is still arranged.

Summary of the invention

The present invention proposes a kind of double-feeding speed varying salient-pole synchronous motor, its problem to be solved is to realize the salient pole synchronous electric machine speed change, particularly on Large Hydroelectric Set, realize the salient pole synchronous electric machine speed governing, to satisfy the demand that electric power system adapts to the national economic development, promptly the novel transmission synchronization motor of this kind has the asynchronized synchronous generator function.

Double-feeding speed varying salient-pole synchronous motor of the present invention comprises stator and rotor, and stator is identical with common alternating current machine stator structure, is made of armature core and stator winding, has P to the utmost point, and it is by symmetrical three-phase main-frequency AC power feed.Rotor is a salient-pole structure, excitation winding and damping winding are housed on the rotor magnetic pole, the axle damping winding is identical in length and breadth with traditional salient pole synchronous electric machine for damping winding, it is characterized in that described rotor has mP to the division magnet limbs, mP is made up of excitation winding each P of m phase the excitation winding of division magnet limbs, m phase excitation winding spatially differs 360 °/m electrical degree and distributes, and is positive integer, m=2～6.

Described double-feeding speed varying salient-pole synchronous motor, it is further characterized in that described stator winding is by symmetrical three-phase main-frequency AC power feed, described m phase rotor-exciting winding is respectively by the low-frequency ac frequency conversion current source feed that differs 360 °/m electrical degree on the time, thus the circular rotating magnetic field of generation.

Described double-feeding speed varying salient-pole synchronous motor, described rotor can have 2P to the division magnet limbs, 2P is made up of excitation winding 2 each P of phase the excitation winding of convex pole, 2 are equivalent to half 4 phases mutually, distribute so 2 phase excitation winding spatially differ 90 ° of electrical degrees, 2 phase rotor-exciting windings are respectively by the low-frequency ac frequency conversion current source feed that differs 90 ° of electrical degrees on the time.

Described double-feeding speed varying salient-pole synchronous motor, described rotor magnetic pole can be the arc salient pole, its pole form can be determined by the basic principle of motor electromagnetic field and the method for finite element analysis, distribute by sinusoidal rule to guarantee the air-gap field waveform.

As everyone knows, in synchronous machine, when electric machine frequency and number of poles were determined, air-gap field rotated with synchronizing speed, and promptly spinner velocity immobilizes.In order to reach the rotor speed change, in double-fed AC excitation motor and double-fed brushless electric machine, it is a notion of utilizing slip power, realizes the rotor speed change, belongs to the category of asynchronous machine.The novel transmission synchronization motor that this paper proposes, key is the synchronous rotary speed of air-gap field is separated with rotary speed of rotator.In rotor m phase winding, pass to the AC frequency conversion electric current, produce the circular rotating field of variable-ratio.In air gap, the air-gap field rotary speed that the rotor winding produces is a rotary speed of rotator and the circular rotating field speed sum of the relative rotor motion of rotor winding generation.According to the static relatively principle of rotor air-gap field, when changing the AC frequency conversion supply frequency, the corresponding variation will take place in rotary speed of rotator; Perhaps when rotary speed of rotator changes, the corresponding AC frequency conversion supply frequency that changes the rotor winding, be the circular rotating field speed of the relative rotor motion of rotor winding generation, thereby change the rotary speed of salient pole synchronous electric machine, realize the salient pole synchronous electric machine speed change.Thereby constitute double-fed quadrature division salient pole speed change salient pole synchronous electric machine.

Below further specify the basic principle of technical solution of the present invention:

In order to analyze and research motor conveniently, for the stator coordinate system, the axis of setting sub-U phase winding is as the origin of coordinates, the circumferential reference axis of stator space is θ, for the rotor coordinate system, if the axis of first couple of magnetic pole Nd of rotor is as the origin of coordinates, the circumferential reference axis of rotor space is x, and rotor is with ω _rSpeed rotate in the space, the rotor magnetic pole winding passes to ω _fThe electric current of frequency, γ are the relative position of rotor rotating coordinate system with respect to the stator coordinate system, and its coordinate system as shown in Figure 2.

By the relation of rotor coordinate system, can obtain expression formula, θ=x+ γ, $\mathrm{\γ}=\underset{0}{\overset{t}{\∫}}{\mathrm{\ω}}_r\mathrm{dt}+{\mathrm{\γ}}_0$ 。γ ₀Be the electrical degree of first couple of magnetic pole Nd of rotor axis when the t=0, i.e. initial position angle of rotor when t=0 generally can be supposed and think γ ₀=0.When rotor rotates with even speed, γ=ω _rT, θ=x+ γ=x+ ω _rT.

The electric current that passes through when motor stator three phase windings is i, its amplitude equate be

Its frequency is ω _s, promptly $i=\sqrt{2}I\sin {\mathrm{\&omega;}}_{s}i$ 。For the three-phase stator winding composite magnetic power, analyze according to Fuli's leaf-size class number, can obtain the expression formula of three-phase stator winding composite magnetic power: $F_s(\mathrm{\&theta;},t)=\mathrm{\&Sigma;}{F}_v\sin ({\mathrm{\&omega;}}_{s}t-\mathrm{v\&theta;})$ $F_v=\frac{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="A0112835100141.png,A0112835100161.png"\; state="\{\{state\}\}">m</figure-callout>}\sqrt{2}}{\mathrm{\&pi;}}\frac{\mathrm{NI}}{\mathrm{vp}}{K}_{\mathrm{nv}}=1.35\frac{\mathrm{NI}}{\mathrm{vp}}{k}_{\mathrm{nv}}$ v＝6k±1 k＝1，2，3…

Wherein N is every mutually every branch road series connection of a stator winding umber of turn, and I is the effective value of stator current.P is the number of pole-pairs of motor, and v is that the level of harmonic wave is inferior, k _NvBe the winding coefficient of motor v subharmonic, F _vAmplitude for motor magnetic potential v subharmonic.

For the magnetic field analysis of rotor-exciting winding, it is by the magnetic pole Nd of d phase, and the magnetic pole Nq of Sd and q phase, Sq winding one-tenth, magnetic pole excitation winding concentrate winding, and the number of turn of corresponding magnetic pole excitation winding is N _Fd, N _Fq, and the number of turn of d, q two-phase winding all equates to be N _f, i.e. N _Fd=N _Fq=N _f, the electric current by two-phase winding is i accordingly _Fd, i _Fq, they are low-frequency ac electric currents, its effective value equates to be I _f, its frequency is ω _f, its phase difference is $\mathrm{\&alpha;}=\&PlusMinus;\mathrm{\&pi;}/2$ 。Promptly $i_{\mathrm{fd}}=\sqrt{2}{I}_{\mathrm{fd}}\sin {\mathrm{\&omega;}}_{f}t=\sqrt{2}{I}_f\sin {\mathrm{\&omega;}}_{f}t$ $i_{\mathrm{fq}}=\sqrt{2}{I}_{\mathrm{fq}}\sin ({\mathrm{\&omega;}}_{f}t-\mathrm{\&alpha;})=\sqrt{2}{I}_f\sin ({\mathrm{\&omega;}}_{f}t-\mathrm{\&alpha;})$ $\mathrm{\&alpha;}=\&PlusMinus;\mathrm{\&pi;}/2$

For the magnetic potential of rotor winding, the magnetic potential of d phase winding is $F_{\mathrm{fd}}=N_{\mathrm{fd}}{i}_{\mathrm{fd}}=N_f\sqrt{2}{I}_f\sin {\mathrm{\&omega;}}_{f}t$ 。Magnetic potential for the q phase winding is $F_{\mathrm{fq}}=N_{\mathrm{fq}}{i}_{\mathrm{fq}}=N_f\sqrt{2}{I}_f\sin ({\mathrm{\&omega;}}_{f}t-\mathrm{\&alpha;})$ Rotor d, the fundamental magnetic potential distribution pattern of q two-phase winding magnetic potential as shown in Figure 3. $F_{\mathrm{fd}}(x,t)=\mathrm{\&Sigma;}{F}_{\mathrm{fdv}}\cos \mathrm{vx}\sin {\mathrm{\&omega;}}_{f}t$ $F_{\mathrm{fdv}}=\frac{4}{\mathrm{\&pi;}}\frac{N_f{I}_f}{\mathrm{vp}}\sin v\left(\frac{{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="A0112835100141.png,A0112835100161.png"\; state="\{\{state\}\}">p</figure-callout>}}}{2}\mathrm{\&pi;}\right)$

v＝1，3，5…

Magnetic potential for the q phase winding is $F_{\mathrm{fq}}(x,t)=\mathrm{\&Sigma;}{F}_{\mathrm{fqv}}\cos v(x-\frac{\mathrm{\&pi;}}{2})\sin ({\mathrm{\&omega;}}_{f}t-\mathrm{\&alpha;})$ $F_{\mathrm{fqv}}=\frac{4}{\mathrm{\&pi;}}\frac{N_f{I}_f}{\mathrm{vp}}\sin v\left(\frac{{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="A0112835100141.png,A0112835100161.png"\; state="\{\{state\}\}">p</figure-callout>}}}{2}\mathrm{\&pi;}\right)$

v＝1，3，5，…

The composite magnetic power of rotor d, q two-phase winding is $F_f(x,t)=\mathrm{\&Sigma;}{F}_{\mathrm{fv}}\sin \left({\mathrm{\&omega;}}_{f}t\stackrel{-}{+}\mathrm{vx}\right)$ $F_{\mathrm{fv}}=\frac{4}{\mathrm{\&pi;}}\frac{N_f{I}_f}{\mathrm{vp}}\sin v\left(\frac{{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="A0112835100141.png,A0112835100161.png"\; state="\{\{state\}\}">p</figure-callout>}}}{2}\mathrm{\&pi;}\right)$

v＝1，3，5…

According to the two relation of rotor coordinate system, x=θ-ω _rF, the composite magnetic power with its substitution rotor d, q two-phase winding obtains relational expression,

F _f(θ，f)＝∑F _fvsin((ω _f±vω _r)t-vθ) $F_{\mathrm{fv}}=\frac{4}{\mathrm{\&pi;}}\frac{N_f{I}_f}{\mathrm{vp}}\sin v\left(\frac{{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="A0112835100141.png,A0112835100161.png"\; state="\{\{state\}\}">p</figure-callout>}}}{2}\mathrm{\&pi;}\right)$

v＝1，3，5…

According to the relative static notion of the basic principle of energy converting between mechanical with the rotor air-gap field, for the air-gap field first-harmonic, promptly during v=1, instantaneous power P _mAnd electromagnetic torque T _EmFor $P_m=T_{\mathrm{em}}\frac{\mathrm{dx}}{\mathrm{dt}}=T_{\mathrm{em}}{\mathrm{\&omega;}}_r$

ω _s＝ω _r±ω _f

When $\mathrm{\&alpha;}=\mathrm{\&pi;}/2$ The time, ω _s=ω _r+ ω _f, be positive sign.When $\mathrm{\&alpha;}=-\frac{\mathrm{\&pi;}}{2}$ The time, ω _s=ω _r-ω _f, be negative sign.When power system frequency is invariable, i.e. ω _s=const.Therefore, when changing ω _fOr ω _rThe time, its ω _rOr ω _fAlso change accordingly.Be ω _r=ω _s-ω _fOr ω _f=ω _s-ω _rWhen changing α, can realize changing the air-gap rotating magnetic field ω that the rotor winding produces _fTurn to, can realize the rotating magnetic field rotary speed ω that rotor speed can produce at stator winding _sVariation up and down.Thereby realize the speed governing of salient pole synchronous electric machine, reach energy converting between mechanical and power transmission.

Work as ω _f=0 o'clock, during promptly to rotor winding feed-in DC power supply, with the conventional synchronization electric machinery seemingly, ω _r=ω _s, the rotor rotating speed is a synchronous speed.It also can realize the energy converting between mechanical and the power transmission of salient pole synchronous electric machine equally.Promptly be out of order when the inverter bridge of rotor AC frequency conversion apparatus, and rectifier bridge be still can work the time, or rotor is when temporarily only having excitation rectifier device, motor still can move, but can not speed governing.

The structure that the present invention proposes has broken through traditional concept, and the air-gap field that the rotor winding produces still keeps static relatively, but the synchronous rotary speed of air-gap field is separated with rotary speed of rotator, to realize the rotor speed change.It belongs to the synchronous machine category.Therefore, it is different from traditional method, this be in theory with structural innovation.

As if this double-feeding speed varying salient-pole synchronous motor is compared with traditional salient pole synchronous electric machine, and stationary part is basic identical, and the rotor portion number of magnet poles doubles, still, the volume of each magnetic pole is half as large approximately.Therefore, the total amount of magnetic pole changes little, and the consumption of effective material of motor is basic identical in other words.But, it and traditional salient pole synchronous electric machine have basic difference in itself with on the performance, because rotor has two-phase 2P to utmost point winding, two-phase rotor winding passes to the AC frequency conversion electric current, rotor forms the two-phase orthogonal winding, produce circular rotating field, the synchronous rotary speed of air-gap field is separated with rotary speed of rotator, to realize the rotor speed change.The power supply of rotor-exciting winding and traditional salient pole synchronous electric machine have important difference, traditional salient pole synchronous electric machine, and the power supply of rotor-exciting winding is a DC power supply, the modern rectifier bridge power supplies of adopting more.The double-fed quadrature division salient pole speed change salient pole synchronous electric machine that the present invention proposes, what the rotor-exciting winding adopted is by the power supply of AC frequency conversion power supply, and is to be advisable with low frequency frequency conversion current source.The two is compared mainly is to increase inverter bridge, and control partly slightly changes.From analyzing economically, in the manufacturing, motor assembly originally slightly increases.But from moving analysis, no matter be to satisfy the requirement of Hydropower Unit aspect the optimum operating condition operation of storage station, second-stage development and the hydraulic turbine etc. three, still in the requirement of satisfying variable speed constant frequency on wind power generation, its economic worth can't be estimated, and it is infinite to be benefited.This invention can also overcome some problems of aforementioned double-fed AC excitation motor and double-fed brushless electric machine, as the labyrinth and the brushless reluctance motor of double-fed of the special mouse cage cover that adopts of complexity, the double-fed brushless electric motor rotor of avoiding fixing difficulty of double-fed AC excitation motor rotor winding overhang and structure be the otherness that makes rotor d, q axle magnetic conductance, the labyrinth of employing.This invention can be fit to the characteristics and the requirement of Large Hydropower Station, particularly hydroenergy storage station, can satisfy the requirement of electric power system for the transmission synchronization motor, make Hydropower Unit possess the asynchronized synchronous generator function, will bring huge benefit and influence to national economy and social development.

Description of drawings:

Fig. 1 is a double-feeding speed varying salient-pole synchronous motor feed schematic diagram of the present invention.

Wherein: 1 is stator (P=1), and 2 is rotor, and Nd, Sd are the magnetic pole of rotor d phase winding, and Nq, Sq are the magnetic pole of rotor q phase winding.

Fig. 2 is a speed change salient pole synchronous electric machine rotor coordinate system schematic diagram of the present invention, and 1 is stator, and A is the axis of stator U phase winding, θ is the circumferential reference axis of stator space, and 2 is rotor, and d is the rotor magnetic pole axis, γ is the relative position of rotor rotating coordinate system with respect to the stator coordinate system, ω _rBe the rotary speed of rotor in the space, x is the circumferential reference axis of rotor space.

Fig. 3 is a double-feeding speed varying salient-pole synchronous motor rotor magnetic potential waveform schematic diagram of the present invention,

F _d(x is by Nd t), the field waveform that the rotor d phase winding that the Sd magnetic pole constitutes produces, F _q(x is by rotor Nq t), the field waveform that the rotor q phase winding that the Sq magnetic pole constitutes produces.

Fig. 4 is a double-fed salient pole speed change salient pole synchronous electric machine structural representation of the present invention,

1-stator (P=2), 2-rotor (2P=4), Nd, Sd are the magnetic pole of rotor d phase winding, Nq, Sq are the magnetic pole of rotor q phase winding

The specific embodiment

Take double-feeding speed varying salient-pole synchronous motor shown in Figure 4 as example, carry out implementation. The utmost point of motor Logarithm is P=2, and it is Z=48 that stator has the groove number, and stator is three-phase symmetric winding, the parallel branch number Be a. Rotor has d, the q two-phase winding, and the magnetic pole logarithm is 2P=4, wherein the magnetic pole of d phase winding Be respectively Nd and Sd, wherein the magnetic pole of q phase winding is respectively Nq and Sq, d, q two-phase excitation Winding spatially differs 90 ° of degree electrical angles, differs in time 90 ° of degree electrical angles, d, q two-phase Exciting Windings for Transverse Differential Protection consists of orthogonal winding, and Damper Winding is installed on magnetic pole simultaneously accordingly. Stator is by right Claim the three-phase alternating-current supply power supply, rotor d, q two-phase Exciting Windings for Transverse Differential Protection are respectively by the low-frequency ac variable-frequency electric Stream source feed, its Damper Winding is identical with traditional salient pole synchronous electric machine.

Stator winding: UVW three phase windings are respectively U phase winding positive trough of belt number is: 1-2-3-4,25-26-27-28; U phase winding negative trough of belt number is :-13--14--15--16 ,-37--38--39--40; V phase winding positive trough of belt number is: 9-10-11-12,33-34-35-36; V phase winding negative trough of belt number is :-21--22--23--24 ,-45--46--47--48; W phase winding positive trough of belt number is: 17-18-19-20,41-42-43-44; W phase winding negative trough of belt number is :-5--6--7--8 ,-29--30--31--32; The parallel branch number can be a=1,2,4; The rotor magnetic pole logarithm is 2P=4.d, and the q two-phase winding is D phase winding number of magnetic poles is: Nd=1,5; Sd=3,7; Q phase winding number of magnetic poles is: Nq=2,6; Sq=4,8; Damper Winding can be similar in length and breadth axle Damper Winding of common salient pole synchronous electric machine.

When rotor had number of phases m=3, when namely the rotor magnetic pole number was three times of stator, it was fixed Sub-winding is example as above, and the number of pole-pairs of motor is P=2, Z=48, and then the rotor magnetic pole logarithm is split into 3P=6, namely rotor has 12 magnetic poles. They distribute at space uniform, differ 120 between the magnetic pole ° electrical angle differs 120 ° of electrical angles on the time, consist of the double-fed symmetric winding, produces circular rotating Magnetic field.

Claims (5)

1. double-feeding speed varying salient-pole synchronous motor, comprise stator and rotor, stator is identical with common alternating current machine stator structure, constitute by armature core and stator winding, has P to the utmost point, rotor is a salient-pole structure, excitation winding and damping winding are housed on the rotor magnetic pole, and the axle damping winding is identical in length and breadth with traditional salient pole synchronous electric machine for damping winding, it is characterized in that described rotor has mP to the division magnet limbs, mP is made up of excitation winding each P of m phase the excitation winding of division magnet limbs, m phase excitation winding spatially differs 360 °/m electrical degree and distributes P=1,2, be positive integer, m=2～6.

2. double-feeding speed varying salient-pole synchronous motor as claimed in claim 1, it is characterized in that described stator winding is by symmetrical three-phase main-frequency AC power feed, described m phase rotor-exciting winding is respectively by the low-frequency ac frequency conversion current source feed that differs 360 °/m electrical degree on the time, thus the circular rotating magnetic field of generation.

3. double-feeding speed varying salient-pole synchronous motor as claimed in claim 1 or 2, it is characterized in that described rotor has 2P to the division magnet limbs, 2P is made up of excitation winding 2 each P of phase the excitation winding of magnet limbs, 2 are equivalent to half 4 phases mutually, distribute so 2 phase excitation winding spatially differ 90 ° of electrical degrees, 2 phase rotor-exciting windings are respectively by the low-frequency ac frequency conversion current source feed that differs 90 ° of electrical degrees on the time.

4. double-feeding speed varying salient-pole synchronous motor as claimed in claim 1 or 2, it is characterized in that described rotor magnetic pole is the arc salient pole, its pole form can be determined by the basic principle of motor electromagnetic field and the method for finite element analysis, distribute by sinusoidal rule to guarantee the air-gap field waveform.

5. double-feeding speed varying salient-pole synchronous motor as claimed in claim 3, it is characterized in that described rotor magnetic pole is the arc salient pole, its pole form can be determined by the basic principle of motor electromagnetic field and the method for finite element analysis, distribute by sinusoidal rule to guarantee the air-gap field waveform.

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