CN100362731C - Double-feeding speed varying salient-pole synchronous motor - Google Patents
Double-feeding speed varying salient-pole synchronous motor Download PDFInfo
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- CN100362731C CN100362731C CNB011283513A CN01128351A CN100362731C CN 100362731 C CN100362731 C CN 100362731C CN B011283513 A CNB011283513 A CN B011283513A CN 01128351 A CN01128351 A CN 01128351A CN 100362731 C CN100362731 C CN 100362731C
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Abstract
The present invention relates to a double-feeding speed-change salient-pole synchronous motor which belongs to the improvement for a principle and a structure of a motor, particularly to a salient-pole synchronous motor. The present invention needs to realize the speed change of salient-pole synchronous motors, particularly large-sized hydraulic generator groups so as to be suitable for the requirements of national economic development. The motor stator of the present invention has the same stator structure as an ordinary alternating-current motor, has P pairs of poles and carries out feeding by a symmetric three-phase power-frequency power supply. A rotor structure is provided with mP pair of split salient magnetic poles, and the excitation winding of the rotor structure is composed of m-phase excitation windings with respective P pairs of poles; the m-phase excitation windings are spatially distributed at the electrical angle of 360 degrees/m and respectively carry out feeding by low-frequency alternating-current frequency-changing current sources at the electrical angle of 360 degrees/m in time, and m is equal to 2 to 6, so that the double-feeding speed-change salient-pole synchronous motor is formed. The present invention can be suitable for the requirements of large-sized hydraulic generator groups in the aspects of storage power stations, second-stage development, the optimum operating condition running of hydraulic turbines, etc. and can satisfy the requirements of power systems to the speed-change synchronous motor which has the function of asynchronized synchronous generators.
Description
Technical Field
The invention belongs to the improvement of the principle and the structure of a motor, and particularly relates to a salient pole synchronous motor.
Background
China is a country with abundant hydraulic resources, and developing hydraulic resources is a basic national policy of the long-term development of the country, and a large number of large hydropower construction projects, in particular pumped storage power stations, need to be developed and constructed in the current western major development. In a pumped storage power station, when an energy storage unit operates as a motor-water pump, the rotating speed of the energy storage unit is usually required to be slightly higher than that of a generator, and a synchronous motor is required to have a speed change function and be adjustable. If a variable speed synchronous motor is adopted, when the generator runs, the water turbine can be always in the optimal working condition and can stably run under light load without generating vibration. When the water pump operates, input power adjustment is realized, and the pumping working condition load is controlled, so that the frequency fluctuation of a power grid is controlled.
In the construction of a high dam of a large hydropower station, secondary development is often expected, namely power generation can be realized at both low dam water head and high dam water head. The water turbine is difficult to adapt to the requirements due to large water head change. If a variable speed synchronous motor is adopted, the variable speed synchronous motor can adapt to great change of the rotating speed ratio of the water turbine, power generation is carried out while construction, and the operation condition is improved.
At present, the water power resources in China have large water head change due to the environment and ecological damage and the river is rich in silt. For a long time, the water turbine industry suffers from the problem that the contradiction of much silt in the flood season and difficulty in selecting the type of a rotating wheel of the water turbine cannot be solved. The variable speed synchronous motor can enable the water turbine to be in the best working condition in flood season or non-flood season, greatly reduces cavitation erosion and sand abrasion of blades of the water turbine, improves the efficiency of the unit and prolongs the service life of the unit. By changing the rotating speed of the water turbine, the cavitation erosion and the silt abrasion of the blades are solved, the optimal working condition of the runner is selected for operation, and the economic benefit is very obvious.
Based on the requirements of the hydroelectric generating set on the aspects of energy storage power stations, secondary development, optimal working condition operation of water turbines and the like, in addition, a synchronous motor with a speed change function is also required to be available in the fields of wind power generation, tidal power stations, ships, aviation generators and the like, which is a requirement of national economic development.
Due to the development of the power industry, there is a particular demand for automatic control capability (AFC) of the grid frequency. When the system is under low load, reactive compensation is to be performed. Higher requirements are required for active power regulation, stable operation of a motor power angle and dynamic response capability thereof. In the western large development, the western electric power transmission, the hydroelectric generating set, the long transmission line, the reactive power regulation, the compensation and the like are all important problems. If the synchronous motor can be operated asynchronously and can be subjected to reactive power regulation, the quality of the power grid is necessarily improved. The problem is the necessary problem in the power industry of China, and therefore the synchronous motor is required to change speed, namely, an asynchronous synchronous generator is required.
In the international large-grid conference in 1992, the 11 th (rotating electrical machine) academic committee was a general conference, and a new variable speed synchronous machine was used as a first priority theme "new development and experience of a motor", former soviet union, japan and other national scholars made special reports. The development and development of the AC excitation motor draw attention from the world. Japanese Hitachi, 1987, manufactures a 22 MVA capacity Exit (Narude) plant # 1 machine for commissioning. Toshiba corporation manufactures a yagi sawa power station 2# machine with 85 MVA capacity, and the machine is put into operation in 1990 of 12 months, and becomes the first variable-speed pumped storage unit in the world. In 1994, nigri corporation of Japan, manufactured variable speed pumped storage units with 400MW capacity for power stations in large rivers, were put into operation. The first 200MW (ASTG-200) asynchronized turbonator of the former Soviet Union was manufactured and put into operation in 1985, and the second was completed in 1991. At present, the development of 300MW asynchronous steam turbine generator units is being pursued. Since the nineties, the research on variable speed synchronous motors at home and abroad is mainly divided into two types of typical motors. First, a doubly-Fed Induction Machine DFIM (doubly-Fed Induction Machine), i.e., an ac excitation Machine represented by a large river power station of hitachi, japan, is disclosed in the following documents: kita E etc. A400 MW Adjustable speed pumped-storage system Water power & Dam construction 1991 No.11; secondly, the Double-Fed Brushless motor BDFM (Brushless Double-Fed Machines), represented by Hunt l.j and Broadway a.r, etc., scholars in england, see the literature: s. Willianmson generalized the order of the brushly double-fed machine Part 1: analysis; part2 model verification and performance, proc. IEE electric. Power application. Vol.144 No2 march 1997 p111-129. They find application as variable speed synchronous generators in the fields of energy storage power stations, wind power generation and the like. In recent years, attention has been paid to research institutes, colleges and universities, and manufacturing plants in China.
It should be noted that both doubly-fed ac excited machines and doubly-fed brushless machines belong to the category of asynchronous machines, both in nature and in construction. A double-fed AC excitation motor is a wound-rotor asynchronous motor, and the speed is regulated by means of slip power. The stator, i.e. the armature, is the same as the stator of the alternating current motor, and the rotor structure is a wound rotor of an asynchronous motor. The stator is connected with a common three-phase power supply for feeding, the rotor is connected with an alternating current variable frequency power supply through a slip ring for feeding, and a slip frequency power supply is input. Thereby forming a Double-Fed Induction Machine (DFIM). For a large vertical hydraulic generator, particularly in a large energy storage unit, the end part of a rotor winding is very difficult to fix due to the fact that the diameter of a rotor of the motor is very large and reaches dozens of meters, the rotating speed is high, and the centrifugal force is large. For this reason, japanese scholars have proposed a series of patented techniques to take measures on the rotor structure. From the investigation and analysis of power stations in large rivers, the frequency conversion device and the control system of the unit are extremely large and complex, the capacity of the frequency conversion device is large, the equipment is expensive, the height of a workshop is increased by one more layer, and the cost of the unit is increased by 30-40%. From the domestic development research, the harmonic content of the unit is high, the transition process time is long when the rotating speed of the unit changes, and the dynamic stability of the unit is poor.
The double-fed brushless motor is a squirrel-cage motor with a special structure, and a squirrel-cage sleeve ('nest' loop) structure is adopted as a rotor. For a Doubly-Fed Brushless Reluctance Machine (Brushless double Fed recovery Machine). The stator is the same as the AC motor stator, and has two sets of windings of p and q pairs with different numbers of poles, where the winding of p pairs of poles is connected with common three-phase power supply to feed to form main winding, and the winding of q pairs of poles is connected with AC variable frequency power supply to feed to form auxiliary winding for speed regulation. On the rotor, a squirrel cage jacket ('nest' loop) structure is placed. The double-fed brushless motor is equivalent to a motor which respectively induces frequencies of p and q antipodes on the same rotor, and the stator and rotor air gap magnetic fields synchronously rotate by utilizing the special structure of a rotor squirrel cage sleeve ('nest' loop) to achieve electromechanical energy conversion, so that the double-fed brushless motor is formed. The motor has a special squirrel cage sleeve ('nest' loop) structure, and meanwhile, the motor is implemented on a large hydroelectric generating set by using different magnetic conductances of d and q axes, the diameter of the rotor reaches more than ten meters, the power of hundreds of thousands of kilowatts is generated, and the structure cannot be realized. Meanwhile, for a double-fed alternating current excitation motor and a double-fed brushless motor, the problems of reactive power regulation and system stability exist, and the large hydroelectric generating set has a great difficulty in meeting the requirement of variable speed synchronization.
Disclosure of Invention
The invention provides a double-fed variable-speed salient pole synchronous motor, which aims to solve the problem of realizing variable speed of the salient pole synchronous motor, particularly realizing speed regulation of the salient pole synchronous motor on a large-scale water turbine generator set so as to meet the requirement that an electric power system adapts to national economic development, namely the novel variable-speed synchronous motor has the function of an asynchronous synchronous generator.
The invention relates to a double-fed variable-speed salient pole synchronous motor, which comprises a stator and a rotor, wherein the stator has the same structure as a stator of a common alternating current motor, consists of an armature core and a stator winding, has P pairs of poles, and is fed by a symmetrical three-phase power frequency alternating current power supply. The rotor is a salient pole structure, the magnetic pole of the rotor is provided with an excitation winding and a damping winding, the damping winding is the same as the longitudinal and transverse shaft damping winding of the traditional salient pole synchronous motor, and the rotor is characterized in that (1) the rotor is provided with m multiplied by P pairs of split salient pole magnetic poles, the excitation winding of the m multiplied by P pairs of split salient pole magnetic poles consists of m phases of P pairs of excitation windings, the m phases of excitation windings are distributed with an electrical angle difference of 360 DEG/m in space and are positive integers, and m = 2-6; (2) The stator winding is fed by a symmetrical three-phase power frequency alternating current power supply, and the m-phase rotor excitation winding is respectively fed by low-frequency alternating current variable-frequency current sources with 360 DEG/m electrical angle difference in time, so that a circular rotating magnetic field is generated.
The rotor of the double-fed variable-speed salient pole synchronous motor can be provided with 2P pairs of split salient pole magnetic poles, the excitation winding of the 2P pairs of the salient pole is composed of 2 phases of P pairs of excitation windings, the 2 phases are half 4 phases, so that the 2 phases of the excitation windings are distributed at an electrical angle of 90 degrees in space, and the 2 phases of the rotor excitation windings are respectively fed by low-frequency alternating-current variable-frequency current sources which are different at an electrical angle of 90 degrees in time.
The double-fed variable-speed salient pole synchronous motor has the advantages that the rotor magnetic poles can be arc-shaped salient poles, and the magnetic pole shapes can be determined by the basic principle of the electromagnetic field of the motor and a finite element analysis method, so that the air gap magnetic field waveforms are distributed according to the sine rule.
It is known that in synchronous machines, the air-gap field rotates at synchronous speed, i.e. the rotor speed is fixed, when the machine frequency and the number of poles are determined. In order to achieve rotor speed change, in a double-fed alternating-current excitation motor and a double-fed brushless motor, the rotor speed change is realized by utilizing the concept of slip power, and the rotor speed change belongs to the category of asynchronous motors. The key to the new variable speed synchronous machine proposed herein is the separation of the synchronous rotational speed of the air-gap field from the rotational speed of the rotor. Alternating current is conducted to the m-phase winding of the rotor to generate a variable-speed circular rotating magnetic field. In the air gap, the air-gap field generated by the rotor winding rotates at a speed that is the sum of the rotor rotation speed and the circular rotating field generated by the rotor winding that moves relative to the rotor. According to the principle that the air gap magnetic fields of the stator and the rotor are relatively static, when the frequency of the alternating-current variable-frequency power supply is changed, the rotating speed of the rotor is correspondingly changed; or when the rotation speed of the rotor changes, the frequency of the alternating current variable frequency power supply of the rotor winding is correspondingly changed, namely the speed of a circular rotating magnetic field which is generated by the rotor winding and moves relative to the rotor, so that the rotation speed of the salient pole synchronous motor is changed, and the speed change of the salient pole synchronous motor is realized. Thereby forming the doubly-fed orthogonal split salient pole variable-speed salient pole synchronous motor.
The basic principle of the technical scheme of the invention is further explained as follows:
for convenience of analyzing and researching the motor, for a stator coordinate system, the axis of a sub U-phase winding is set as a coordinate origin, a coordinate axis of a stator space distributed along the circumference is theta, for a rotor coordinate system, the axis of a first pair of magnetic poles Nd of a rotor is set as the coordinate origin, the coordinate axis of the rotor space distributed along the circumference is x, and the rotor is represented by omega r Is rotated in space, and the rotor pole winding is energized by omega f The current of the frequency, γ, is the relative position of the rotor rotation coordinate system with respect to the stator coordinate system, which is shown in fig. 2.
From the relationship of the stator and rotor coordinate systems, the expression, θ = x + γ,γ 0 for the electrical angle of the axis of the first pair of magnetic poles Nd of the rotor at t =0, i.e. the initial position angle of the rotor at t =0, it can be assumed that γ is generally considered 0 And =0. When the rotor rotates at a uniform speed, γ = ω r t，θ＝x+γ＝x+ω r t。
When the current passing through the three-phase winding of the motor stator is I, its amplitude is equal to 58286 and I, its frequency is omega s I.e. i = 58286Isin omega s i. For the stator three-phase winding synthetic magnetic potential, according to the Fourier series analysis, an expression of the stator three-phase winding synthetic magnetic potential can be obtained:
F s (θ，t)＝∑F v sin(ω s t-vθ)
v＝6k±1 k＝1，2，3…
n is the number of turns of each branch in series connection with the winding of each phase of the stator winding, and I is the effective value of the stator current. p is the pole pair number of the motor, v is the order of the harmonic wave, k nv The winding coefficient, F, being the v-harmonic of the motor v Is the amplitude of the v subharmonic of the magnetic potential of the motor.
For the magnetic field analysis of rotor exciting winding, it is formed from d-phase magnetic poles Nd, sd and q-phase magnetic poles Nq, sq, the magnetic pole exciting winding is concentrated winding, and the number of turns of correspondent magnetic pole exciting winding is N fd ，N fq And the number of turns of the d-q two-phase winding is equal to N f I.e. N fd ＝N fq ＝N f The corresponding current through the two-phase winding is i fd ，i fq They are low-frequency alternating currents with an effective value equal to I f At a frequency of ω f The phase difference is α = ± pi/2. Namely, it is
i fd ＝I fd sinω f t＝I f sinω f t
i fq ＝I fq sin(ω f t-α)＝I f sin(ω f t-α)
α＝±π/2
For the magnetic potential of the rotor winding, the magnetic potential of the d-phase winding is F fd ＝N fd i fd ＝N f I f sinω f t. Magnetic potential of F for q-phase winding fq ＝N fq i fq ＝N f I f sin(ω f t- α). The distribution pattern of the fundamental wave magnetic potential of the d, q two-phase windings of the rotor is shown in figure 3.
F fd (x，t)＝∑F fdv cosvxsinω f t
v＝1，3，5…
For a q-phase winding the magnetic potential is
v＝1，3，5，…
The resultant magnetic potential of the d and q two-phase windings of the rotor is
F f (x，t)＝ΣF fv sin(ω f tvx)
v＝1，3，5…
According to the relation between the stator and rotor coordinate systems, x = theta-omega r t, substituting the magnetic field into the resultant magnetic potential of the two-phase windings of the rotor d and q to obtain a relational expression,
F f (θ，t)＝∑F fv sin((ω f ±vω r )t-vθ)
v＝1，3，5…
according to the fundamental principle of electromechanical energy conversion and the concept that the stator and rotor airgap fields are relatively static, for the airgap field fundamental wave, i.e. v =1, the instantaneous power P m And electromagnetic torque T em Is composed of
ω s ＝ω r ±ω f
When α = π/2, ω s ＝ω r +ω f I.e. positive. When the temperature is higher than the set temperature
When ω is s ＝ω r -ω f I.e. negative sign. When the frequency of the power system is constant, i.e. ω s = const. Therefore, when ω is changed f Or ω r When it is omega r Or ω f And correspondingly. I.e. omega r ＝ω s -ω f Or ω f ＝ω s -ω r . When alpha is changed, the air gap rotating magnetic field omega generated by the rotor winding can be changed f The rotation speed of the rotor can be realized at the rotation speed omega of the rotating magnetic field generated by the stator winding s Up and down variations of (c). Therefore, the speed regulation of the salient pole synchronous motor is realized, and the electromechanical energy conversion and the power transmission are achieved.
When omega f =0, i.e. when a dc power supply is fed to the rotor winding, ω being similar to a conventional synchronous machine r ＝ω s The rotation speed of the motor rotor is synchronous rotation speed. And the electromechanical energy conversion and power transmission of the salient pole synchronous motor can be realized. When the inverter bridge of the rotor AC frequency conversion device fails and the rectifier bridge can still work or the rotor only has an excitation rectifier device temporarily, the motor can still run but cannot regulate the speed.
The structure provided by the invention breaks through the traditional concept, the air-gap magnetic field generated by the stator and rotor windings still keeps relatively static, but the synchronous rotating speed of the air-gap magnetic field is separated from the rotating speed of the rotor, so that the speed change of the rotor is realized. It belongs to the category of synchronous motors. Therefore, it is different from the conventional method, which is a theoretical and structural innovation.
Compared with the traditional salient pole synchronous motor, the doubly-fed variable-speed salient pole synchronous motor has the advantages that the stator part is basically the same, the number of the magnetic poles of the rotor part is seemingly doubled, and the volume of each magnetic pole is about one half smaller. The total amount of the magnetic poles does not vary much, or the consumption of active material of the machine is substantially the same. However, it is fundamentally different from the conventional salient pole synchronous motor in the nature and performance because the rotor has two-phase 2P antipodal windings, the two-phase rotor windings are energized with alternating current, the rotor forms two-phase orthogonal windings to generate a circular rotating magnetic field, and the synchronous rotating speed of the air gap magnetic field is separated from the rotating speed of the rotor to realize the speed change of the rotor. The power supply of the rotor excitation winding is different from that of the traditional salient pole synchronous motor, the power supply of the rotor excitation winding of the traditional salient pole synchronous motor is a direct current power supply, and a rectifier bridge is adopted for supplying power for the traditional salient pole synchronous motor. The rotor excitation winding of the double-fed orthogonal split salient pole variable-speed salient pole synchronous motor is supplied with power by an alternating current variable-frequency power supply, and is preferably a low-frequency variable-frequency current source. Compared with the prior art, the inverter bridge is added, and the control part is slightly changed. The total cost of the motor is slightly increased from the economical analysis and the manufacturing. However, from the analysis of operation, no matter the requirements of the hydroelectric generating set on three aspects of an energy storage power station, secondary development, optimal working condition operation of a water turbine and the like are met, or the requirements of variable speed and constant frequency on wind power generation are met, the economic value of the hydroelectric generating set cannot be estimated, and the hydroelectric generating set is beneficial to infinity. The invention can also overcome the problems of the double-fed AC excitation motor and the double-fed brushless motor, such as the difficulty of fixing the winding end part of the rotor of the double-fed AC excitation motor and the complexity of the structure, the complex structure of a special squirrel cage sleeve adopted by the rotor of the double-fed brushless motor and the complex structure adopted by the double-fed brushless reluctance motor for ensuring the difference of the magnetic conductances of the d and q axes of the rotor. The invention can be suitable for the characteristics and requirements of large hydroelectric generating sets, particularly pumped storage power stations, and can meet the requirements of a power system on variable-speed synchronous motors, so that the hydroelectric generating sets have the function of asynchronous synchronous generators and can bring great benefits and influences on national economy and social development.
Description of the drawings:
FIG. 1 is a schematic diagram of the feed of the doubly-fed variable speed salient pole synchronous machine of the present invention.
Wherein: 1 denotes a stator (P = 1), 2 denotes a rotor, nd and Sd denote magnetic poles of a d-phase winding of the rotor, and Nq and Sq denote magnetic poles of a q-phase winding of the rotor.
FIG. 2 is a schematic view of a coordinate system of a stator and a rotor of the variable speed salient pole synchronous motor of the present invention, wherein 1 is the stator, A is the statorThe axis of the U-phase winding, theta is a coordinate axis of the stator space distributed along the circumference, 2 is a rotor, d is a rotor magnetic pole axis, gamma is the relative position of a rotor rotating coordinate system relative to a stator coordinate system, and omega r Is the rotation speed of the rotor in space, and x is a coordinate axis distributed along the circumference of the rotor space.
FIG. 3 is a schematic diagram of the magnetic potential waveform of the rotor of the doubly-fed variable-speed salient pole synchronous motor of the invention,
F d (x, t) is the magnetic field waveform generated by the d-phase winding of the rotor composed of Nd, sd magnetic poles, F q (x, t) is a magnetic field waveform generated by a rotor q-phase winding composed of the magnetic poles of the rotors Nq, sq.
FIG. 4 is a schematic structural diagram of a doubly-fed salient pole variable-speed salient pole synchronous motor of the present invention,
1-stator (P = 2), 2-rotor (2P = 4), nd, sd are magnetic poles of d-phase winding of rotor, nq, sq are magnetic poles of q-phase winding of rotor
Detailed Description
The description will be given taking a doubly-fed variable-speed salient-pole synchronous machine shown in fig. 4 as an example. The number of pole pairs of the motor is P =2, the number of slots of the stator is Z =48, the stator is a three-phase symmetrical winding, and the number of parallel branches is a. The rotor is provided with d and q two-phase windings, the number of pole pairs is 2P =4, magnetic poles of the d-phase winding are Nd and Sd respectively, magnetic poles of the q-phase winding are Nq and Sq respectively, the d and q two-phase excitation windings are different in electric angle of 90 degrees in space and 90 degrees in time, the d and q two-phase excitation windings form orthogonal windings, and damping windings are correspondingly mounted on the magnetic poles. The stator is powered by a symmetrical three-phase alternating current power supply, the d and q two-phase excitation windings of the rotor are respectively fed by a low-frequency alternating current variable-frequency current source, and the damping winding of the rotor is the same as that of the traditional salient pole synchronous motor.
Stator winding: the UVW three-phase windings are respectively
The number of the positive phase belt groove of the U-phase winding is as follows: 1-2-3-4, 25-26-27-28;
the number of the negative phase belt groove of the U-phase winding is as follows: -13-14-15-16-37-38-39-40;
the number of the positive phase belt groove of the V-phase winding is as follows; 9-10-11-12, 33-34-35-36;
the number of the negative phase belt groove of the V-phase winding is as follows: -21-22-23-24-45-46-47-48;
the positive phase of the W-phase winding has the slot number: 17-18-19-20, 41-42-43-44;
the number of the negative phase belt groove of the W-phase winding is as follows: -5-6-7-8-29-30-31-32;
the number of parallel branches may be a =1,2,4;
the number of pairs of rotor poles is 2p =4: d, q two-phase windings of
The number of the magnetic poles of the d-phase winding is as follows: nd =1,5; sd =3,7;
the number of the q-phase winding magnetic poles is as follows: nq =2,6; sq =4,8;
the damping winding can be similar to a common salient pole synchronous motor longitudinal and transverse shaft damping winding.
When the motor rotor has a number of phases m =3, i.e. the number of rotor poles is three times that of the stator, the stator winding thereof may be as in the above example, the number of pole pairs of the motor is P =2,z =48, and the number of rotor pole pairs is split to 3p =6, i.e. the rotor has 12 poles. The magnetic poles are uniformly distributed in space, the difference between the magnetic poles is 120 degrees in electrical angle in time, double-fed symmetrical windings are formed, and a circular rotating magnetic field is generated.
Claims (3)
1. The utility model provides a double-fed variable speed salient pole synchronous machine, includes stator and rotor, and the stator is the same with alternating current motor stator structure, comprises armature core and stator winding, has P antipole, and the rotor is salient pole structure, is equipped with field winding and damping winding on the rotor magnetic pole, and damping winding is the same with salient pole synchronous machine vertical and horizontal axle damping winding, its characterized in that:
the rotor is provided with m multiplied by P pairs of split salient pole magnetic poles, excitation windings of the m multiplied by P pairs of split salient pole magnetic poles are composed of m phases of P pairs of excitation windings, the m phases of excitation windings are spatially different from each other by 360 degrees/m electrical angle distribution, P =1,2, \ 8230, the m = 2-6, and the m is a positive integer;
the stator winding is fed by a symmetrical three-phase power frequency alternating current power supply, and the m-phase rotor excitation winding is respectively fed by low-frequency alternating current variable-frequency current sources with 360 DEG/m electrical angle difference in time, so that a circular rotating magnetic field is generated.
2. The doubly-fed variable speed salient synchronous machine of claim 1 wherein said rotor has 2P pairs of split salient poles, the field windings of the 2P pairs of salient poles being comprised of 2 phases of P pairs of field windings, the 2 phases corresponding to half 4 phases, so that the 2 phase field windings are spatially distributed with 90 ° electrical degrees of phase difference, and the 2 phase rotor field windings are each fed by low frequency ac variable frequency current sources with 90 ° electrical degrees of phase difference in time.
3. A doubly-fed variable speed salient synchronous machine according to claim 1 or 2, wherein said rotor poles are arc-shaped salient poles, and the shape of the poles is determined by the fundamental principles of the electromagnetic field of the machine and by a finite element analysis, so as to ensure that the airgap field waveform is distributed in a sinusoidal manner.
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| CN101369747B (en) * | 2008-06-24 | 2010-12-22 | 清华大学 | Salient pole wound rotor asynchronous motor |
| CN102223037B (en) * | 2011-05-17 | 2012-12-26 | 宁玉泉 | Novel variable-speed salient-pole synchronous motor and huge rotary frequency converter |
| CN102291078B (en) * | 2011-08-09 | 2014-03-26 | 东元总合科技（杭州）有限公司 | Electric power generating system and control method thereof |
| CN102368656B (en) * | 2011-10-11 | 2014-02-19 | 清华大学 | Double-fed asynchronous motor with damping winding |
| CN102710077A (en) * | 2012-06-13 | 2012-10-03 | 中机国际工程设计研究院有限责任公司 | Orthogonal excitation synchronous motor and method for establishing gearbox and traditional synchronous motor test system by using same |
| CN110492643B (en) * | 2019-06-19 | 2024-04-12 | 长江勘测规划设计研究有限责任公司 | Generator motor suitable for seawater pumped storage power station |
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| CN85102627A (en) * | 1985-04-06 | 1986-10-08 | 熊英 | The submersible pump of rotor-impeller of pump one |
| JPH07143694A (en) * | 1993-11-11 | 1995-06-02 | Toyota Motor Corp | Rotor structure of synchronous machine and synchronous motor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102627A (en) * | 1985-04-06 | 1986-10-08 | 熊英 | The submersible pump of rotor-impeller of pump one |
| JPH07143694A (en) * | 1993-11-11 | 1995-06-02 | Toyota Motor Corp | Rotor structure of synchronous machine and synchronous motor |
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