CN100495899C - Double-rotor variable speed and variable frequency power generator - Google Patents

Abstract

A double-rotor generator of variable speed and variable frequency wind power-generating exciting type is prepared as setting wind master wheel with stator on master driving shaft on wind motor and setting wind sub-wheel and permanent magnet external rotor on sub-driving shaft on wind motor, setting exciter and generator main body in shell by coaxially series-connected way, setting permanent magnet external rotor and exciter internal rotor to be relative rotation mode, connecting sub-driving shaft and master driving shaft coaxially in mutual rotation mode.

Description

The double-rotor variable speed frequency conversion generator

Technical field

The present invention relates to wind-driven generator, particularly permanent-magnet variable-speed variable frequency excitation double-rotor pneumatic electric machine.

Background technology

Known techniques such as Chinese patent CN200510022771.1 disclose a kind of speed changing, frequency converting method of wind power generation, be characterized in, at first the rotating speed with the wind energy conversion system rotor passes through the step-up gear speedup, the power shaft of the input power input differential permanent-magnet motor that then speed change is produced, carry out power dividing or interflow by the box of tricks of differential permanent-magnet motor and produce the stator winding that power circuit enters differential permanent-magnet motor and electrical network is realized the constant speed variable-frequency power generation, to improve the generating efficiency of electricity generation system through feeder line.

And for example Chinese patent CN200410003089.3 discloses a kind of MW level and has directly driven the permanent-magnetic outer rotor synchro wind generator, and it adopts multipole outer-rotor structure.This generator comprises fixed axis, rotation axis, coil windings, permanent magnetic steel, iron core, stator and external rotor, wherein rotation axis by Bearing Installation on fixed axis, stator is installed on the fixed axis by stator support, external rotor is installed on the rotation axis by rotor field spider, can be provided with axial cooling ventilation duct between winding coil and stator support; Windward side between external rotor and stator is provided with protective cover.Because number of poles is many, its rotating speed is very low, thereby does not need step-up gear supporting, can directly drive generating; Generator does not have the cooling fan of carrying or adorns cooling system outward.

Known wind turbine generator is produced wind wheel by gear box under the wind-force effect transmission of power is given generator and is made it obtain corresponding rotating speeds; Usually the rotating speed of wind wheel is very low, does not far reach the high-speed engine desired rotating speed that generates electricity, and must be used for realization by the speedup of gear box gear pair; And the work condition environment of wind-driven generator unit is generally very poor, and the gear box fault that takes place frequently is a common occurrence.

The product reliability that known techniques is made is poor, the maintenance cost height, and unit efficiency is low.Industry wishes to utilize the speed changing, frequency converting range of operation of the brushless structure and the broad of brushless double-fed machine technology, in conjunction with being installed on the technical advantage of oppositely two phoenix wheels of wind rotation efficiently being utilized wind energy on the birotor power transmission shaft mutually, remove the speed changing, frequency converting operation that gear box and complicated control system realize generating set.

Summary of the invention

Problem to be solved by this invention is, overcomes the above-mentioned defective that the technology of taking over exists, and a kind of double-rotor variable speed frequency conversion generator is provided.

The present invention solves the variable speed variable frequency pneumatic electric machine technical problem and takes following technical scheme to realize, according to a kind of double-rotor variable speed frequency conversion generator provided by the invention, comprise the generator main body, the rotor of this generator is the structure setting of relative stator rotation by final drive shaft, it is characterized in that exciter is contained in the casing with the coaxial string of generator main body by the final drive shaft of device main air wheel; Permanent-magnetic outer rotor is to be the structure setting that counterrotating structure and this permanent-magnetic outer rotor are relative generator unit stator rotation with the exciter internal rotor; Described exciter internal rotor winding number of pole-pairs is set to Pe to the utmost point; Described generator amature winding number of pole-pairs is set to Pg to the utmost point; Configuration main air wheel on the described final drive shaft, the main air wheel speed satisfies following relational expression:

$\mathrm{Nzr}=\frac{60\×(\mathrm{fg}-\mathrm{fe})}{\mathrm{Pg}+\mathrm{Pe}}$

Wherein: Nzr represents the main air wheel speed; Pg represents the stator winding number of pole-pairs; Pe represents the number of pole-pairs of permanent-magnetic outer rotor; Fg represents stator frequency; Fe represents the permanent-magnetic outer rotor reduced frequency;

Secondary wind wheel be can drive permanent-magnetic outer rotor constructing apparatus on counter drive shaft; Become the coaxial connection of the mode that to rotate mutually by the counter drive shaft of secondary wind wheel transmission with the final drive shaft of taking turns transmission by main air.

This case technical solution problem can also adopt following technical measures further to realize,

Aforesaid double-rotor variable speed frequency conversion generator, wherein, the secondary wind wheel of configuration on the counter drive shaft, the rotating speed of secondary wind wheel relative stator and permanent-magnetic outer rotor reduced frequency satisfy following relational expression:

$\mathrm{fe}=\frac{\mathrm{Ne}\×\mathrm{Pe}}{60}$ Wherein: Ne vice wind wheel relative stator rotating speed.

Aforesaid double-rotor variable speed frequency conversion generator wherein, disposes permanent-magnetic outer rotor on the counter drive shaft, the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor satisfies following relational expression:

Nzre＝Nzr+Ne

Wherein: Nzre represents the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor; Nzr represents the main air wheel speed; Ne vice wind wheel relative stator rotating speed.

Aforesaid double-rotor variable speed frequency conversion generator, wherein, described exciter internal rotor winding is connected by connecting line negative-phase sequence between rotor with the generator amature winding.

Aforesaid double-rotor variable speed frequency conversion generator, wherein, the drive structure device of the relative main air wheel of secondary wind wheel reverse rotation is on counter drive shaft, and this pair wind wheel is upwind wind is installed, the main air wheel is assemblied on the final drive shaft, and wind direction was to the setting of wind rotational structure under this main air wheel was.

Aforesaid double-rotor variable speed frequency conversion generator, wherein, described major and minor power transmission shaft all has the hollow via-hole of preset diameters.

Aforesaid double-rotor variable speed frequency conversion generator, wherein, described power transmission shaft is by being configured in bearing on the generator and the bearings on the exciter.

Aforesaid double-rotor variable speed frequency conversion generator, wherein, default spacing between secondary wind wheel and the exciter.

The present invention compared with prior art has significant advantage and beneficial effect.By above technical scheme as can be known, the present invention has following advantage at least under the structural arrangements of excellence:

The two wind wheels of this case design are worked simultaneously, and wind energy utilization is than improving 15%-25% with capacity list wind wheel unit.Brushless double-fed machine rotor and rotary permanent-magnet external rotor dual-rotor structure are adopted in this case, realize the operation of unit speed changing, frequency converting, quite reduce half, thereby shorten the generator diameter space greatly, make things convenient for the equipment transportation, reduce unit weight with capacity single rotor power generator electrode logarithm;

The configuration of two wind wheel structure settings of this case and Yawing mechanism makes the simpler, reliable of set yaw control change; This case unit can realize that speed changing, frequency converting operation, variable pitch regulate, and the following this case of the rated wind speed pair more single wind wheel speed changing, frequency converting of wind wheel generation unit unit wind energy utilizations increase, and non-gear box, can realize directly driving the worry of no slip ring fault;

The present invention compared with prior art has significant contribution and progress, is really to have novelty, creativeness, practical good technology.

The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.

Description of drawings

Fig. 1 is an apoplexy electric machine structure schematic diagram of the present invention;

Fig. 2 is an excitation winding wiring construction schematic diagram of the present invention;

Fig. 3 is a speed changing, frequency converting exciter control system structural representation of the present invention;

Fig. 4 is a speed changing, frequency converting exciter control system operation principle block diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, feature and effect thereof, describe in detail as after.

Shown in Fig. 1-4, a kind of double-rotor variable speed frequency conversion generator M comprises the generator main body 1 that is packed on the base 10, and generator unit stator 16 is installed in the motor casing 111, and generator amature 14 is the structure setting that relative stator 16 is rotated by final drive shaft 13, wherein,

Exciter 4 is contained in the casing by final drive shaft and the coaxial string of generator main body; Permanent magnet 43 is installed on the yoke 42 in the permanent-magnetic outer rotor housing 410, constitutes the permanent-magnetic outer rotor 41 of exciter, this permanent-magnetic outer rotor by connector 46 to be counterrotating structure setting with exciter internal rotor 45; Described permanent magnet 43 becomes configuration set, its number of pole-pairs and exciter internal rotor number of pole-pairs coupling by known techniques; Permanent-magnetic outer rotor is relative exciter internal rotor rotation, the also structure setting of generator unit stator rotation relatively;

Counter drive shaft 12 and final drive shaft 13 coaxial connections; Described major and minor power transmission shaft all has the hollow via-hole 130 of preset diameters, so that the Generator Set power transmission shaft is satisfying under the specification requirement condition more lightweight, thereby the reduction body weight, this power transmission shaft supports by the bearing 115,116 and the bearing on the exciter 147,148 that are configured on the generator;

Thus, the exciter internal rotor of generator amature and this rotor coaxial transmission rotation forms the tandem rotor structure of generator, and be birotor structure with permanent-magnetic outer rotor, thereby can realize the operation of unit speed changing, frequency converting, quite reduce 1/3-1/2 at least with capacity single rotor power generator electrode logarithm, thereby can shorten the generator diameter, further reduce motor weight;

By known techniques, will by the counter drive shaft 12 of secondary wind wheel transmission with by 13 one-tenths coaxial installations of the bind mode that can rotate mutually of final drive shaft of main air wheel transmission, by counter drive shaft with the transmission of power of secondary wind wheel to permanent-magnetic outer rotor;

The drive structure device that secondary wind wheel 2 relative main airs wheels oppositely rotate wind is at the axle body end of counter drive shaft 12, this pair wind wheel is upwind with known techniques by the F2 direction by its wheel hub 21 wind is installed, leave the default spacing L that avoids secondary wind wheel and tower collision between secondary wind wheel and the exciter, can determine the reservation spacing that secondary wind wheel and pylon do not collide by the number of degrees at the main air wheel elevation angle.

Main air wheel 3 is assemblied in final drive shaft 13 axle body ends, and wind direction was to the setting of wind rotational structure under this main air wheel was by the F3 direction with known techniques by its wheel hub 31.

A kind of variable speed variable frequency pneumatic electric machine exciter control system comprises wind-powered electricity generation machine M, and the main air wheel 3 of wind-powered electricity generation machine is configured on the final drive shaft, and the stator 16 that has the Pg number of pole-pairs under the wind-force effect relatively is with the rotation of Ner speed, and the main air wheel speed satisfies following relational expression: $\mathrm{Nzr}=\frac{60\×(\mathrm{fg}-\mathrm{fe})}{\mathrm{Pg}+\mathrm{Pe}}$

Wherein: Nzr represents the main air wheel speed; Pg represents the stator winding number of pole-pairs; Pe represents the number of pole-pairs of permanent-magnetic outer rotor 41; Fg represents stator frequency; Fe represents the permanent-magnetic outer rotor reduced frequency;

Described exciter internal rotor 45 winding numbers of pole-pairs are set to Pe to the utmost point; Described generator amature 14 winding numbers of pole-pairs are set to Pg to the utmost point; Described exciter internal rotor winding is connected by 123 negative-phase sequences of connecting line between rotor with the generator amature winding; Described stator winding number of pole-pairs Pg is set to greater than permanent-magnetic outer rotor number of pole-pairs Pe, and described stator winding number of pole-pairs can be 3 times a permanent magnetism internal rotor number of pole-pairs;

The wind-powered electricity generation machine secondary wind wheel 2 be configured on the counter drive shaft, this pair wind wheel drive permanent-magnetic outer rotor with the relative main air wheel of Ne speed oppositely to the wind rotation, and the permanent-magnetic outer rotor reduced frequency satisfies following relational expression:

$\mathrm{fe}=\frac{\mathrm{Ne}\×\mathrm{Pe}}{60}$ Wherein: Ne vice wind wheel relative stator rotating speed;

Be configured to the permanent-magnetic outer rotor that the Nzre rotating speed is counterrotating, have the Pe number of pole-pairs on counter drive shaft, the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor satisfies following relational expression: Nzre=Nzr+Ne

Wherein: Nzre represents the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor;

Be provided with on the aforesaid major and minor wind wheel and the signal of rotating speed can be sent to the main air wheel speed measurement mechanism G of unit centralized control equipment 5, secondary wind speed round measurement mechanism G1, the wind speed that the port D1 that connects via the wind speed checkout gear records and by the wind speed round that rotation-speed measuring device records is transferred to unit centralized control equipment 5; Unit centralized control equipment and yawer 6 connect, and control main air wheel wind direction down rotates wind, and yawer 6 can be installed on the engine room inside 101 under the base;

Described main air wheel is taken turns variable propeller pitch adjusting mechanism 38, secondary wind wheel variable propeller pitch adjusting mechanism 28 with the main air of the hub portion difference configuration adjustment propeller pitch angle of secondary wind wheel, this main air wheel, secondary wind wheel variable propeller pitch adjusting mechanism and the 5 electric connections of unit centralized control equipment are sent the instruction of change oar by 5 pairs of main air wheels of unit centralized control equipment variable propeller pitch adjusting mechanism 38; Dispose secondary wind wheel propeller pitch angle measurement mechanism G28, main air wheel propeller pitch angle measurement mechanism G38 in described main air wheel and the secondary wind wheel respectively;

Described major and minor wind wheel variable propeller pitch adjusting mechanism structure is identical, it is made up of change oar servomechanism 381,281 that drives with servomotor M38, M28 and change oar control device 382,282, and the integrated control 5 of described unit is by becoming oar control device 382,282 and connecting with the change oar servomechanism 381,281 that servomotor M38, M28 drive; This change oar servomechanism changes the rotational speed regulation of carrying out main air wheel and secondary wind wheel according to detected propeller pitch angle under the control of unit centralized control equipment 5, realize that wind direction rotates wind under the main air wheel, and secondary wind wheel upwind is rotated to wind oppositely; Brake 15 is arranged between generator ' s cover and the secondary wind wheel wheel hub;

Voltage output end at generator connects be incorporated into the power networks frequency converter 7 and step-up transformer 8 successively, connects with external power grid W again; The voltage measuring apparatus G4 that connects at be incorporated into the power networks between frequency converter and the step-up transformer configuration successively and unit centralized control equipment 5, the detecting device for output current G3 that connects with the unit centralized control equipment; The unloaded checkout gear G5 that connects at generator M and be incorporated into the power networks between the frequency converter configuration and unit centralized control equipment; The unit centralized control equipment also have the port D1 that connects with wind speed checkout gear (not shown), with wind direction checkout gear (not shown) connect port D2, with the port D3 of host computer transmission data; Described major and minor wind wheel blade is pressed known technology mode device on the wind wheel wheel hub, described main air impeller blade wind sweeping area is greater than blade wind sweeping area 2-5 times of secondary wind wheel, especially be that 3 times of left and right sides of blade wind sweeping area of secondary wind wheel are preferable with main air impeller blade wind sweeping area, described wind sweeping area is the area that the wind wheel rotation forms;

To sum up, the wind-powered electricity generation machine of two wind wheel organizations, wherein larger-diameter main air wheel is used for generating, secondary wind wheel than minor diameter is used for regulating the double generating of excitation frequency, the two on same axis, mutually opposite spin, yawer be responsible for controlling the main air wheel down wind direction wind is rotated main force's generating; Oppositely to the wind rotation, auxiliary power generation improves usefulness to secondary wind wheel upwind greatly.

The voltage output end of described generator be incorporated into the power networks configurations such as frequency converter can be regulated generator output voltage, with after date softly be incorporated into the power networks, soft parallel off when shutting down, can effectively reduce the impact of the reactive current that is incorporated into the power networks, guarantee unit safety operation; When generator reached rated output power, power of the assembling unit factor was controlled at operation about cos θ=1; When the generator active power of output hour, the lagging reactive power of unit output cos θ＜1; When generator speed was lower than specified minimum speed or output of a generator and is higher than peak power output, off-the-line generator from the electrical network was finished soft off-the-line by configurations such as the frequency converters that is incorporated into the power networks.

A kind of speed changing, frequency converting wind power generation exciting method:

1). be configured in the stator 16 that has the Pg number of pole-pairs under the wind-force effect relatively main air wheel 3 on the final drive shaft 13, and the main air wheel speed satisfies following relational expression with the rotation of Nzr speed:

$\mathrm{Nzr}=\frac{60\×(\mathrm{fg}-\mathrm{fe})}{\mathrm{Pg}+\mathrm{Pe}}$

Wherein: Nzr represents the main air wheel speed; Pg represents the stator winding number of pole-pairs; Pe represents the number of pole-pairs of permanent-magnetic outer rotor 41; Fg represents stator frequency; Fe represents the permanent-magnetic outer rotor reduced frequency;

2). the secondary wind wheel drive permanent-magnetic outer rotor in the configuration of counter drive shaft 12 ends oppositely rotates wind with the relative main air wheel of Ne speed, and the permanent-magnetic outer rotor reduced frequency satisfies following relational expression:

$\mathrm{fe}=\frac{\mathrm{Ne}\×\mathrm{Pe}}{60}$ Wherein: Ne vice wind wheel relative stator rotating speed;

3). be configured to the relative main air wheel of Nzre rotating speed oppositely to wind permanent-magnetic outer rotor rotation, that have the Pe number of pole-pairs on counter drive shaft, the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor satisfies following relational expression: Nzre=Nzr+Ne

Wherein: Nzre represents the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor

4). described exciter internal rotor 45 winding numbers of pole-pairs are set to Pe to the utmost point; Described generator amature 14 winding numbers of pole-pairs are set to Pg to the utmost point; Described exciter internal rotor winding is connected by 123 negative-phase sequences of connecting line between rotor with the generator amature winding;

5). when the main air wheel is lower than rated speed, the unit centralized control equipment carries out main air vane tip Transmission Ratio Control, wind speed that the port D1 that connects via the wind speed checkout gear records and the main air wheel speed that records by rotation-speed measuring device G, be transferred to unit centralized control equipment 5, warp is right with the main air vane tip speed ratio numeric ratio that the unit centralized control equipment is preset, calculate the adjusting numerical value of propeller pitch angle, compare with the propeller pitch angle value of main air wheel propeller pitch angle measurement mechanism G38 collection again, send the instruction of change oar by 5 pairs of main airs wheels of unit centralized control equipment variable propeller pitch adjusting mechanism 38;

By unit centralized control equipment 5 according to $\mathrm{Nzr}=\frac{60\×(\mathrm{fg}-\mathrm{fe})}{\mathrm{Pg}+\mathrm{Pe}}$ Relational expression is carried out speed Control to major and minor wind wheel; Can realize that thus the main air wheel moves with its best tip speed ratio, reaches the purpose that makes full use of wind energy below rated speed;

When the main air wheel reached rated speed, the unit centralized control equipment carried out power control to generator; The output voltage of the output current of the generator that records via detecting device for output current G3 and the generator that records via output voltage measurement mechanism G4 is transferred to unit centralized control equipment 5, and the output of a generator value that calculates via this unit centralized control equipment is right with default rated power numeric ratio; When meeting preset value, wind speed that the port D1 that is connect by the wind speed checkout gear that the unit centralized control equipment will collect records and the main air wheel rated speed that records by rotation-speed measuring device G, calculate the adjusting numerical value of the propeller pitch angle of main air wheel rated speed under this wind speed, compare with the propeller pitch angle value of main air wheel propeller pitch angle measurement mechanism G38 collection again, send the instruction of change oar by 5 pairs of main airs wheels of unit centralized control equipment variable propeller pitch adjusting mechanism 38; Can realize that thus the main air wheel moves, and prevents the generator overload under firm power;

6). when secondary wind wheel is lower than rated speed, the unit centralized control equipment carries out secondary wind wheel tip speed ratio control, wind speed that the port D1 that connects via the wind speed checkout gear records and the secondary wind speed round that records by secondary wind speed round measurement mechanism G1 are transferred to unit centralized control equipment 5; Warp is right with the secondary wind wheel tip speed ratio numeric ratio that the unit centralized control equipment is preset, calculate the adjusting numerical value of propeller pitch angle, compare with the propeller pitch angle value of secondary wind wheel propeller pitch angle measurement mechanism G28 collection again, main air wheel variable propeller pitch adjusting mechanism 28 is sent the instruction of change oar by the unit centralized control equipment; Can realize that thus secondary wind wheel moves with its best tip speed ratio, reaches the purpose that makes full use of wind energy below rated speed;

When secondary wind wheel reached rated speed, the unit centralized control equipment carried out power control to generator; The output voltage of the output current of the generator that records via detecting device for output current G3 and the generator that records via output voltage measurement mechanism G4 is transferred to unit centralized control equipment 5, and the output of a generator value that calculates via unit centralized control equipment 5 is right with default rated power numeric ratio; When meeting preset value, wind speed that the port D1 that is connect by the wind speed checkout gear that unit centralized control equipment 5 will collect records and the secondary rated rotation speed of rotor that records by rotation-speed measuring device G, calculate the adjusting numerical value of the propeller pitch angle of secondary rated rotation speed of rotor under this wind speed, compare with the propeller pitch angle value of secondary wind wheel propeller pitch angle measurement mechanism G28 collection again, send the instruction of change oar by 5 pairs of secondary wind wheel variable propeller pitch adjusting mechanisms 28 of unit centralized control equipment; Can realize that thus the main air wheel moves, and prevents the generator overload under firm power; Make generator smaller or equal to rated speed the time, keep the output voltage frequency of generator at 5Hz-50Hz scope internal speed-changing converting operation, especially with the output voltage frequency of generator in 10Hz-20H the best, by frequency converter 7 rectifications and the inversion of being incorporated into the power networks, generator is incorporated into the power networks with the output voltage frequency of 50Hz all the time, has realized the speed changing, frequency converting operation of wind-powered electricity generation unit indirectly;

7). stator winding number of pole-pairs Pg is set greater than permanent-magnetic outer rotor number of pole-pairs Pe, describedly makes stator winding number of pole-pairs and p-m rotor number of pole-pairs close being Pg=3Pe, making its major and minor wind speed round satisfy Ne=2Nzr have under this state $\mathrm{Nzr}=\frac{60\×\mathrm{fg}}{\mathrm{Pg}+3\mathrm{pe}},$ Therefore,, realize the operation of unit speed changing, frequency converting, quite reduce half with capacity single rotor power generator electrode logarithm with brushless double-fed machine rotor and rotary permanent-magnet external rotor dual-rotor structure.

Thereby, the two rotor windings of connecting during work have identical power frequency, mutual reciprocal rotating magnetic field, generator amature winding excitation field connect relatively rotor rotary speed Nzre and main air wheel shaft mechanical rotation speed Nzr stack, cooperate, form the speed changing, frequency converting excitation field of generator unit stator, this rotating magnetic field produces the 5Hz-50Hz electromotive force in to the stator winding of the utmost point having Pg, realizes variable-speed operation, the frequency conversion transmission of electricity of generating set by the frequency converter that is incorporated into the power networks.

8). the main air wheel that is assemblied on the power transmission shaft 13 is relatively oppositely to wind rotation configuration with the relative opposite direction adjusting of the secondary wind wheel 2 that is assemblied in counter drive shaft by the blade pitch angle.Make full use of the reverse rotation wake energy of secondary wind wheel back, wind energy utilization is than improving 15%-25% with capacity list wind wheel unit.

9). in the time of between rated speed that permanent-magnet variable-speed variable frequency excitation double-rotor pneumatic electric machine is incorporated into the power networks, the main air wheel speed is being preset when connecting and the minimum speed, secondary wind wheel oppositely rotates wind by pre-conditioned under unit centralized control equipment 5 is regulated.

The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.

Claims (8)

1. double-rotor variable speed frequency conversion generator, comprise generator main body (1), the rotor of this generator (14) is the structure setting of relative stator (16) rotation by final drive shaft (13), it is characterized in that exciter (4) is contained in the casing with the coaxial string of generator main body by the final drive shaft of device main air wheel (3); Permanent-magnetic outer rotor is to be the structure setting that counterrotating structure and this permanent-magnetic outer rotor are relative generator unit stator rotation with exciter internal rotor (45); Described exciter internal rotor winding number of pole-pairs is set to Pe to the utmost point; Described generator amature winding number of pole-pairs is set to Pg to the utmost point;

Configuration main air wheel (3) on the described final drive shaft, the main air wheel speed satisfies following relational expression:

$\mathrm{Nzr}=\frac{60\×(\mathrm{fg}-\mathrm{fe})}{\mathrm{Pg}+\mathrm{Pe}}$

Wherein: Nzr represents the main air wheel speed; Pg represents the stator winding number of pole-pairs; Pe represents the number of pole-pairs of permanent-magnetic outer rotor; Fg represents stator frequency; Fe represents the permanent-magnetic outer rotor reduced frequency;

Secondary wind wheel (2) be can drive permanent-magnetic outer rotor constructing apparatus on counter drive shaft; Become the coaxial connection of the mode that to rotate mutually by the counter drive shaft (12) of secondary wind wheel transmission with the final drive shaft (13) of taking turns transmission by main air.

2. double-rotor variable speed frequency conversion generator according to claim 1 is characterized in that, the secondary wind wheel of configuration on the counter drive shaft, and the rotating speed of secondary wind wheel relative stator and permanent-magnetic outer rotor reduced frequency satisfy following relational expression: $\mathrm{fe}=\frac{\mathrm{Ne}\×\mathrm{Pe}}{60}$ Wherein: Ne vice wind wheel relative stator rotating speed.

3. as double-rotor variable speed frequency conversion generator as described in the claim 2, it is characterized in that, dispose permanent-magnetic outer rotor on the counter drive shaft, the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor satisfies following relational expression: Nzre=Nzr+Ne

Wherein: Nzre represents the rotating speed of the relative exciter internal rotor rotation of permanent-magnetic outer rotor; Nzr represents the main air wheel speed; Ne vice wind wheel relative stator rotating speed.

4. as double-rotor variable speed frequency conversion generator as described in the claim 3, it is characterized in that described exciter internal rotor winding is connected by connecting line negative-phase sequence between rotor with the generator amature winding.

5. as double-rotor variable speed frequency conversion generator as described in one of claim 1-4, it is characterized in that, the drive structure device of the relative main air wheel of secondary wind wheel reverse rotation is on counter drive shaft, this pair wind wheel is upwind wind is installed, the main air wheel is assemblied on the final drive shaft, and wind direction was to the setting of wind rotational structure under this main air wheel was.

6. double-rotor variable speed frequency conversion generator as claimed in claim 5 is characterized in that, described major and minor power transmission shaft all has the hollow via-hole (130) of preset diameters.

7. double-rotor variable speed frequency conversion generator as claimed in claim 6 is characterized in that, described major and minor power transmission shaft supports by the bearing (115,116) and the bearing (147,148) on the exciter that are configured on the generator.

8. double-rotor variable speed frequency conversion generator as claimed in claim 7 is characterized in that, default spacing L between secondary wind wheel and the exciter.

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