CN107707090B - Double-stator superconducting brushless doubly-fed wind driven generator - Google Patents

Double-stator superconducting brushless doubly-fed wind driven generator Download PDF

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CN107707090B
CN107707090B CN201710878081.9A CN201710878081A CN107707090B CN 107707090 B CN107707090 B CN 107707090B CN 201710878081 A CN201710878081 A CN 201710878081A CN 107707090 B CN107707090 B CN 107707090B
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stator
superconducting
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dewar
winding
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CN107707090A (en
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程明
朱新凯
韩鹏
魏新迟
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Southeast University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/02—Windings characterised by the conductor material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/16—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots for auxiliary purposes, e.g. damping or commutating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

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  • Power Engineering (AREA)
  • Superconductive Dynamoelectric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The invention relates to a double-stator superconducting brushless doubly-fed wind driven generator which is provided with an outer stator (1), a rotor (4) and an inner stator (7), wherein the outer stator (1) needs to adopt a segmented assembly structure. The single Dewar magnet (11) surrounds the outer stator yoke (2) of the outer stator (1) and is externally connected to form a control winding distributed at a regular distance. Each single Dewar magnet (11) consists of an outer Dewar (12) and an inner Dewar (13), and a superconducting coil (14) is arranged inside the inner Dewar (13). The inner stator (7) is provided with a power winding (9) distributed in a short distance and can be made of copper wires or superconducting wires. In order for the performance of a doubly-fed machine to be good, both the control winding and the power winding must take the form of distributed windings. Pole pair number p of superconducting control windingscNumber of pole pairs p of power windingcwThe number n of the rotor magnetic iron core blocks (6)rMust satisfy the relationship nr＝psc+pcw. The number of the rotor non-magnetic conductive blocks (5) is equal to that of the rotor magnetic conductive iron core blocks (6).

Description

Double-stator superconducting brushless doubly-fed wind driven generator
Technical Field
The invention relates to a brushless double-fed wind driven generator technology with a double-stator structure and applied superconducting materials, and belongs to the technical field of motors.
Background
The safety of energy supply is ensured, and the foundation for ensuring the national economic health and rapid development is provided. In order to solve the practical problems of fossil energy crisis, environmental pollution and the like, the state has gone out of a series of relevant policies, and the development of clean energy such as wind energy, solar energy, hydroenergy, advanced nuclear energy and the like is greatly promoted, wherein the wind energy is one of the fastest-developing new energy. In the embodiment of the energy equipment 2025 manufactured by China, the main tasks and the embodiment of the wind power equipment are described in detail: the development is suitable for a large onshore wind generating set with the central height of the hub of 100-plus-200 meters, a large-scale offshore wind generating set with the power of 10MW, a large-scale offshore floating wind generating set with the power of 10MW and various basic structures, a large-scale wind generating set with the power of 5-7MW, a large-scale wind generating set with the power of 10MW (double-fed and direct-driven) and key components with independent intellectual property rights are mastered, and an ultra-long low-wind-speed blade, an ultra-high-power high-temperature superconducting wind driven.
The offshore wind is rich in resources, high in wind speed and stable in wind speed, land resources are not occupied, and the influence of operation noise on the land environment is small, so that the offshore wind becomes a new direction for wind power development. In order to reduce the electricity consumption cost, the development of 10MW and above offshore wind turbines is a well-recognized technical trend in the industry. If a common permanent magnet direct-drive scheme is adopted to research and develop a 10MW wind generating set, the weight and the volume of the wind generating set bring great difficulty to the manufacturing, the transportation and the installation of the wind generating set. The superconducting material has the characteristic of zero resistance under the required conditions, and can bear large current density. If the superconducting material is applied to the motor, the magnetic load or the electric load of the motor can be improved by 2-3 times, so that the weight and the volume of the motor are reduced, and in order to avoid the saturation problem of the ferromagnetic material, the superconducting motor mostly adopts an air winding, so that the weight and the volume of the motor are further reduced, and the research and development of the ultra-high-power offshore wind turbine generator set are possible. Research has shown that, in the same 10MW motor, the weight of the superconducting motor is only 150 tons, the diameter is less than 5 meters, and the reduction is about 50% compared with the conventional motor.
With the rapid development of high-temperature superconducting materials, high-temperature superconducting motors have also been widely researched, wherein the widest and most deep research is the superconducting excitation synchronous motor based on a conventional motor structure. The superconducting excitation is arranged on a rotor, so that the rotating magnetic superconducting motor is called, the excitation current of the rotating magnetic superconducting motor needs to be led in through an electric brush and a slip ring, and the cooling liquid also needs to be input by adopting rotary sealing, so that the design difficulty is high. The superconducting field is mounted on the stator, so that the rotating pivot type superconducting motor solves the problem of rotary sealing, but the output of armature current still needs brushes and slip rings, and the reliability of the motor is reduced. The operating principle of the superconducting excitation flux switching motor and the superconducting excitation vernier motor which appear in recent years is determined that the motor is required to be composed of a salient pole type stator and a salient pole type rotor which are made of ferromagnetic materials, and the performance of the superconducting materials is limited due to the saturation problem of the ferromagnetic materials. Meanwhile, the excitation winding and the armature winding are positioned in the same stator core, so that space arrangement is difficult, and further improvement of the power density of the motor is limited. No matter the superconducting synchronous motor with the traditional structure or the stator excitation type superconducting synchronous motor, a full-power converter is required for control, the use of the full-power converter further improves the cost of a superconducting motor system, and the popularization and the use of the superconducting motor system are not facilitated.
In recent years, brushless doubly-fed motors are also a research hotspot of academia, the armature and the slip ring of the asynchronous doubly-fed motor are removed, the advantage that only part of a power converter is needed for control is kept, and the power density of the brushless doubly-fed motor is lower than that of the asynchronous motor. If the superconducting technology and the brushless doubly-fed machine technology are combined, a superconducting brushless doubly-fed machine is developed, for example, a control winding of the brushless doubly-fed machine is made of superconducting materials. When the capacity of the motor reaches the level of 10MW, the capacity of the superconducting control winding is about 3MW, and the superconductor has zero resistance under certain conditions, so that compared with a copper wire control winding, the superconducting motor has an obvious energy-saving effect and can obviously improve the efficiency of the motor. Meanwhile, compared with a 10MW superconducting direct current excitation synchronous motor, the capacity of a power converter of the 10MW superconducting brushless double-fed motor only needs about 3MW, and the cost of a superconducting power generation system is greatly reduced. Based on the advantages, the invention provides the superconducting brushless doubly-fed motor, which is mainly used for a high-power offshore wind driven generator. According to a traditional brushless double-fed motor with a single stator-rotor structure, a control winding and a power winding are located on the same stator core, space competition exists between the windings, arrangement is difficult, and direct coupling is easy to occur between two sets of windings. Therefore, the structure of the double stators is adopted, the control winding and the power winding are respectively positioned on the inner stator and the outer stator, and the simple salient pole rotor is nested between the two stators. The superconducting brushless double-fed motor has remarkable advantages, so that the superconducting brushless double-fed motor has bright prospects in academic research and industrial application.
Disclosure of Invention
The technical problem is as follows: in order to avoid the problems of complex installation, low reliability and the like of a cooling system with dynamic rotary seal, the double-stator superconducting brushless double-fed wind motor provided by the invention realizes static seal of a superconducting magnet cooling system, simultaneously reduces system loss, improves the power density and efficiency of the motor, and further reduces the cost of a power generation system by applying a partial power converter to control the motor to realize a variable-speed constant-frequency power generation function according to the working principle of the variable-speed constant-frequency double-fed motor.
The technical scheme is as follows: the double-stator superconducting brushless doubly-fed wind driven generator is provided with two stators and a reluctance rotor which are respectively an outer stator, a rotor and an inner stator; the rotor is positioned between the outer stator and the inner stator, the rotor comprises a rotor non-magnetic conductive block and a rotor magnetic conductive iron core block which are sequentially and repeatedly arranged, the outer stator comprises an outer stator yoke and single Dewar magnets surrounding the outer stator yoke, the number of the single Dewar magnets can form integral-distance distributed windings of integral slots, and the inner stator is provided with power windings distributed at short distances.
Wherein the content of the first and second substances,
the outer stator is assembled in a segmented mode, the single Dewar magnet surrounds the outer stator yoke of the outer stator, and the control windings are distributed at a regular distance after being externally connected.
The control winding is a ring-shaped integer pitch distribution winding formed by a runway type superconducting coil.
The single Dewar magnet consists of an outer Dewar and an inner Dewar, a superconducting coil is arranged in the inner Dewar, and the control winding consists of the superconducting coil.
The control winding and the power winding both adopt the form of distributed windings, and the number p of pole pairs of the control windingscNumber of pole pairs p of power windingcwThe number n of the rotor magnetic conduction iron core blocksrSatisfies the relation nr＝psc+pcwThe number of the non-magnetic conductive blocks (5) of the rotor is equal to that of the magnetic conductive iron core blocks of the rotor.
The power winding adopts a whole-distance distributed winding or a short-distance distributed winding and is made of copper wires or superconducting wires.
The positions of the power winding and the control winding can be interchanged.
The inner stator and the rotor can be made into a block assembly type.
The inner stator and the outer stator can be in a toothed structure or a toothless structure.
The working principle is as follows: when the superconducting wire enters into a superconducting state, a large alternating current exciting current can be introduced into the superconducting wire in the superconducting critical state. Three-phase symmetrical alternating current is introduced into the superconducting control winding, and the frequency is fcGenerating a number of pole pairs p in the outer air gapscAt a rotational speed of
Figure BDA0001417391940000021
The magnetic field of (1) can establish a pole pair number p in an inner air gap through the modulation effect of a rotor magnetic conduction iron core blockcwAnd the power winding on the inner stator. If the prime mover drags the rotor to rotate at a speed n, an induced electromotive force is induced in the power winding to output electric power to the outside, and the frequency of the electromotive force is
Figure BDA0001417391940000022
The rotor speed can be obtained by conversion of a formula
Figure BDA0001417391940000031
It can thus be seen that by adjusting the frequency f, the rotor speed is variedcThe frequency f of the power winding can be adjustedwThe constant frequency is kept unchanged, and the variable speed constant frequency operation is realized. Similarly, if alternating current is introduced into the power winding, the current interacts with the magnetic field to generate electromagnetic torque to drive the rotor to rotate, mechanical power is output outwards, and the frequency f is adjustedcAnd variable speed operation can be realized.
Has the advantages that: compared with the existing similar motor, the motor has the following advantages:
1. the power winding and the control winding are respectively positioned on the inner stator and the outer stator, so that the space benefit rate is high, and the structure is compact;
2. the high-temperature superconducting control winding is arranged on the stator and is still, and the current of the winding can be directly led in without passing through an electric brush and a slip ring; the superconducting cooling liquid can be directly introduced without rotary sealing, so that the motor has the advantages of simple structure, low cost, good cooling effect, high reliability, high efficiency and energy conservation;
3. compared with a high-power high-temperature superconducting synchronous motor, the cost of a superconducting power generation system is greatly reduced by using a partial power converter;
4. compared with the traditional brushless double-fed motor, the control winding is made of the superconducting wire, so that the copper consumption of the motor is reduced, the efficiency of the motor is improved, and particularly, the high-efficiency energy-saving effect is more obvious for the motor with ultrahigh power;
5. the stator can be of a toothless structure, the magnetic field is slightly limited by the saturation characteristic of teeth, and the torque/power density of the motor can be improved;
6. each superconducting coil is independently cooled, so that online monitoring is facilitated, when the superconducting coils break down, only the problem coils need to be repaired and maintained, and operation is convenient;
7. the stator of the motor adopts a modular structure, is convenient to transport and install on site, and has good application prospect in occasions such as offshore wind power and the like.
Drawings
FIG. 1 is a schematic view of the overall assembly of the motor of the present invention;
FIG. 2 is a schematic view of the assembly of a monolithic superconducting magnet of the machine of the present invention;
FIG. 3 is a schematic view of a single-section outer stator of the motor of the present invention;
FIG. 4 is a schematic view of the outer stator teeth of the motor of the present invention;
FIG. 5 is a schematic diagram of a single lobe stator consisting of a monolithic superconducting magnet and a single segment stator in the electrical machine of the present invention;
FIG. 6 is a schematic view of the outer stator of the electric machine of the present invention without teeth;
FIG. 7 is a schematic view of the integral outer stator of the motor of the present invention;
FIG. 8 is a waveform of no-load electromotive force of the power winding when the motor of the present invention is operating in sub-synchronous operation;
FIG. 9 is a waveform of no-load electromotive force of the power winding during synchronous operation of the motor of the present invention;
fig. 10 is the no-load electromotive force waveform of the power winding when the motor of the present invention is running in super-synchronous.
The figure shows that: the device comprises an outer stator 1, an outer stator yoke 2, outer stator teeth 3, a rotor 4, a rotor non-magnetic conductive block 5, a rotor magnetic conductive iron core block 6, an inner stator 7, inner stator teeth 8, a power winding 9, a single Dewar magnet 11, an outer Dewar 12, an inner Dewar 13 and a superconducting coil 14.
Detailed Description
The double-stator superconducting brushless doubly-fed wind driven generator comprises two stators and a reluctance rotor, wherein the two stators and the reluctance rotor are concentrically arranged from inside to outside or coaxially arranged from left to right. The technical solution is now explained in the form of a concentric arrangement: the three parts are sequentially called as an inner stator, a rotor and an outer stator from inside to outside, an outer air gap is arranged between the outer stator and the rotor, and an inner air gap is arranged between the inner stator and the rotor; the outer stator comprises an outer stator yoke, outer stator teeth, a runner-type Dewar flask and a superconducting control winding distributed in an annular and regular distance; the superconducting control winding is placed in the Dewar flask; the gap between the outer stator teeth forms an outer stator slot, each outer stator slot is correspondingly provided with a Dewar flask, and the Dewar flasks surround the outer stator yoke; the superconducting coils in the Dewar flask are connected through an external lead to form a control winding distributed in an annular integer distance; the outer stator adopts a sectional assembly mode; the inner stator comprises an inner stator yoke, inner stator teeth and a power winding, wherein the power winding is made of common copper wires, is in a short-distance distribution mode and is placed in empty grooves between the inner stator teeth. The rotor comprises magnetic conducting iron core blocks and non-magnetic conducting iron core blocks which are uniformly distributed along the circumferential direction.
In order to obtain good performance of the brushless doubly-fed machine, distributed windings must be used for both the control winding and the power winding. However, the superconducting wire has poor machining performance, the end twist design is difficult, the superconducting wire is not suitable for designing a distributed winding with a span pole pitch like a copper wire, and the current carrying capacity of the superconducting wire is seriously reduced due to complex mechanical deformation, so that the advantages of the superconducting wire cannot be exerted. If the scheme of integral cooling is adopted for the superconducting control winding, the connection between the superconducting coils, the design of lead-out wires (used for measuring and monitoring the superconducting magnet) on the superconducting coils and the like are complicated. Therefore, the invention mainly provides a scheme that the single Dewar magnet is surrounded on the outer stator yoke to form an annular distributed winding. In the scheme, each superconducting coil is independently cooled, leading-out wires are conveniently arranged, the online monitoring of the superconducting magnet is easily realized, the static cooling of the superconducting coils is realized, and a complex cooling system is avoided. When a problem occurs in a certain superconducting coil, only the problem coil needs to be repaired and maintained. Although sleeving the superconducting magnet on the stator yoke may not allow efficient use of the superconducting wire on one side, the conventional step-by-step distributed winding is long at the end, and the amount of superconducting wire used is not necessarily small compared to the annular distributed winding, especially when the radial length ratio of the motor is large and the number of pole pairs is small.
Because the superconducting magnet is sleeved on the outer stator yoke, the outer stator is assembled in a blocking mode. The outer stator yoke is divided into a number of segments equal to the number of individual Dewar magnets, each segment of stator yoke being referred to as a single segment stator, as shown in FIG. 3. A single dewar magnet and a single segment stator constitute a single lobe stator as shown in fig. 5. All the single-lobe stators are installed and welded according to the corresponding key grooves to form the outer stator without stator teeth in a splicing mode, as shown in figure 6. Finally, the stator teeth are installed in the corresponding key grooves of the stator yoke and welded as shown in fig. 4, and the complete outer stator as shown in fig. 7 is assembled.
The positions of the power winding and the control winding can be interchanged.
The power winding adopts a whole-distance distributed winding or a short-distance distributed winding.
The control winding is a ring-shaped integer pitch distribution winding formed by a runway type superconducting coil.
The inner stator and the rotor can be made into a block assembly type.
The inner stator and the outer stator can be in a toothed structure or a toothless structure.
The number of pole pairs of the power winding is pswThe number of the rotor magnetic conduction iron core blocks is nrThe number of pole pairs of the control winding is pcwThe three must satisfy the relationship: n isr＝psw+pcw。
As shown in fig. 1, the outer stator 1, the rotor 4, and the inner stator 7 are concentrically arranged in the figure. From outside to inside, the coaxial outer stator, the outer air gap, the rotor, the inner air gap and the inner stator are arranged in sequence. The outer stator 1 comprises an outer stator yoke 2, outer stator teeth 3 and a racetrack Dewar flask 11. The dewar 11 is composed of an outer dewar 12 and an inner dewar 13, and a runway type superconducting coil 14 is provided in the inner dewar 13, as shown in fig. 2. The number of the outer stator teeth 3 is 12 as shown in fig. 4. The number of the Dewar flasks is equal to the number of the outer stator teeth, and the Dewar flasks 11 are surrounded on the outer stator yoke 2. The 12 superconducting coils 14 in the Dewar flask are connected through an external lead to form a three-phase annular integer pitch distributed winding with each pole having 2 slots per phase and 1 pole pair number. The outer stator 1 is assembled in sections and comprises 12 outer stator teeth as shown in fig. 4 and 12 single-lobe stators as shown in fig. 5. The inner stator 7 comprises inner stator teeth 8, an inner stator yoke 10 and a power winding 9 which is embedded in the inner stator slots and is formed by winding a copper wire. The inner stator 7 is not assembled in a sectional mode. The number of the inner stator teeth is 60, and the power winding 9 is a short-distance distributed winding with the number of slots of each pole and each phase being 2 and the number of pole pairs being 4. The rotor 4 comprises 5 non-magnetic conductive blocks 5 and 5 magnetic conductive iron core blocks 6 which are uniformly distributed along the circumference, and the size and the shape of the rotor magnetic conductive iron core blocks 6 can be optimized according to design requirements.
Since the superconducting magnet needs to be sleeved on the outer stator yoke, the outer stator has to adopt a segmented structure. The whole outer stator is assembled by 12 single-section stators, 12 stator teeth and 12 superconducting magnets. The specific installation steps are as follows: firstly, a superconducting magnet is sleeved on the single-segment stator shown in fig. 3 to form a single-lobe stator, as shown in fig. 5. And then the 12 single-lobe stators are spliced together to form the outer stator without stator teeth, as shown in figure 6. Finally, the stator teeth as shown in fig. 4 are placed in the corresponding slots to form the complete outer stator as shown in fig. 7.
In the invention, the positions of the superconducting control winding and the copper wire power winding can be interchanged, the pole pair number of the two sets of windings can be designed into different pole pair numbers according to the application requirement, and the number of the magnetic conducting iron cores of the rotor is also designed into the numberThe number of the pole pairs p of the superconducting control winding can be different according to the requirementscNumber of pole pairs p of copper wire power windingcwNumber n of rotor magnetic core blocksrMust satisfy the relationship nr＝psc+pcw。
In the invention, the outer stator teeth 3 can be made of non-magnetic material or can adopt a non-salient pole structure, and the raceway-type Dewar flask is also surrounded on the outer stator yoke.
In the invention, the inner stator teeth 8 can adopt a non-salient pole structure, and the copper wire power winding is fixed on the inner stator iron core in the modes of epoxy resin and the like.
In the invention, the power winding 9 can also be made of superconducting wires, so that a full-superconducting double-stator brushless doubly-fed generator topological structure is generated.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.

Claims (9)

1. A double-stator superconducting brushless doubly-fed wind generator is characterized in that the generator is provided with two stators and a reluctance rotor which are respectively an outer stator (1), a rotor (4) and an inner stator (7); the rotor (4) is positioned between the outer stator (1) and the inner stator (7), the rotor (4) comprises a rotor non-magnetic conducting block (5) and a rotor magnetic conducting iron core block (6) which are sequentially and repeatedly arranged, the outer stator (1) comprises an outer stator yoke (2) and single Dewar magnets (11) which surround the outer stator yoke (2), the number of the single Dewar magnets can form integral-distance distributed windings of integral slots, and the inner stator (7) is provided with power windings (9) distributed at short distances;
the outer stator (1) adopts a sectional assembly mode, the single Dewar magnet (11) surrounds the outer stator yoke (2) of the outer stator (1), and control windings distributed at a regular distance are formed after external connection.
2. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1, wherein said control winding is a circular pitch distributed winding formed by a racetrack type superconducting coil.
3. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1, characterized in that said single dewar magnet (11) is composed of an outer dewar (12) and an inner dewar (13), the inner portion of the inner dewar (13) being formed of a single layer of steel, said single layer of steel being formed of a single layer of
A superconducting coil (14) is placed, and the control winding is formed by the superconducting coil (14).
4. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1, wherein said control winding and said power winding are in the form of distributed windings, and the number p of pole pairs of said control winding isscNumber of pole pairs p of power windingcwThe number n of the rotor magnetic conduction iron core blocks (6)rSatisfies the relation nr＝psc+pcwThe number of the non-magnetic conductive blocks (5) of the rotor is equal to that of the magnetic conductive iron core blocks (6) of the rotor.
5. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1, characterized in that said power windings (9) are distributed by a whole pitch or a short pitch, and are made of copper wire or superconducting wire.
6. A double stator superconducting brushless doubly fed wind generator as claimed in claim 1, characterized in that said internal stator (7) is mounted in blocks or in one piece.
7. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1 wherein said power winding and said control winding are interchangeable.
8. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1 wherein said inner stator and said rotor are both formed in a block assembly.
9. A double-stator superconducting brushless doubly-fed wind generator as claimed in claim 1, wherein said inner stator and said outer stator are both of a toothed structure or a toothless structure.
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