JP2008128144A - Wind turbine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind turbine generator for improving output by effectively utilizing wind energy wherein a permanent magnet used for power generation is not likely to be demagnetized. <P>SOLUTION: In the wind turbine generator 80 provided with a rear part rotor 83 for rotating by receiving wind force and a front part stator 81 provided at a front flow of this rear part rotor 83, the permanent magnet 52 and an armature 51 are provided at one of the rear part rotor 83 and the front part stator 81 and a yoke 32 is provided to face to the permanent magnet 52 and the armature 51 to form magnetic flux at the other one of them. The permanent magnet 52, the armature 51, and the yoke 32 are provided so as to align in an axial direction of a rotation shaft 22 of the rear part rotor 83. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of a wind turbine generator.

  In recent years, small wind power generators using wind energy have been installed as independent power sources such as street lamps in urban areas. Since such a small wind power generator has lower power generation efficiency than a large wind power generator, it is required to effectively use wind energy in order to improve the output of the small wind power generator.

As a conventional wind power generator, a permanent magnet is attached to the tip side of a rotatable blade, and a coil is disposed on the outer side in the radial direction of the permanent magnet (for example, see Patent Document 1), or two rotors on a main shaft. There is known one in which a magnet is attached to one of these rotors and an induction coil is attached to the other (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-299197 Japanese Patent Laid-Open No. 7-174067

FIG. 1 of Patent Document 1 will be described with reference to FIG. 6 below. In addition, the code | symbol was reassigned.
FIG. 6 is a front view of a conventional wind power generator. The wind power generator 200 includes a rotating shaft 201 rotatably supported by a support member (not shown) and a plurality of blades attached radially to the rotating shaft 201. 202, a ring 203 attached to each end of the blade 202, a plurality of permanent magnets 204 attached to the outer peripheral surface of the ring 203, and a permanent magnet 204 radially outward of these permanent magnets 204. And a plurality of coils 206 arranged so as to face each other, and an iron core 207 around which these coils 206 are wound.

FIG. 1 of Patent Document 2 will be described with reference to FIG. In addition, the code | symbol was reassigned.
FIG. 7 is a cross-sectional view of a conventional wind turbine generator. The wind turbine generator 210 includes a main shaft 211, two rotors 212 and 213 that are rotatably attached to the main shaft 211 so as to be aligned in the axial direction, and Blades 214 attached to the tips of the rotors 212 and 213, a plurality of magnets 216 attached to one rotor 212, and attached to the other rotor 213 so as to face the inner side in the radial direction of the magnet 216. It consists of a plurality of induction coils 217.

  In the above-mentioned Patent Document 1, since the permanent magnet 204 and the coil 206 are arranged in the radial direction, the outer dimensions of the wind power generator 200 are increased. For example, when the outer dimension is set to a predetermined dimension, the length of the blade 202 is shortened and the wind receiving area is decreased. If the wind receiving area is reduced, the energy of the wind passing per unit time is reduced, so that the output obtained, that is, the output of the wind power generator 200 is reduced.

  Also in Patent Document 2, since the magnet 216 and the induction coil 217 are arranged in the radial direction, the outer dimensions of the two rotors 212 and 213 are increased. Therefore, as in Patent Document 1, the output of the wind power generator 210 is small. Become.

In both Patent Document 1 and Patent Document 2, power is generated by electromagnetic induction using a magnet and a coil, but a power generation method with a larger power generation amount is required to increase the output.
Further, the permanent magnet is desired to have a structure that is difficult to demagnetize because the magnetic force becomes weak, that is, demagnetizes under the influence of use time, temperature change, external magnetic field, vibration, impact, and the like.

  An object of the present invention is to provide a wind power generation apparatus that improves output by effectively using wind energy and that is less likely to demagnetize a permanent magnet used for power generation.

  According to a first aspect of the present invention, there is provided a wind turbine generator including a rotor that is rotated by receiving wind force, and a stator that is disposed upstream or downstream of the rotor. A yoke is disposed on the other side so as to be opposed to the field magnet and the armature in order to form a magnetic flux of the field magnet, and the field magnet, the armature, and the yoke are connected to the rotating shaft of the rotor. It arrange | positions so that it may align with an axial direction, It is characterized by the above-mentioned.

  As an operation, the field magnet, the armature, and the yoke are arranged side by side in the radial direction by arranging the field magnet, the armature, and the yoke so as to be arranged in the axial direction of the rotation axis of the rotor. The diameter of the stator and rotor is smaller than

  Therefore, the field magnet and armature of the present invention and the yoke are arranged so as to be aligned in the axial direction of the rotation axis of the rotor, and the conventional permanent magnet and the coil are aligned in the radial direction. When the rotor diameter is set to the same predetermined dimension, the wind receiving area of the rotor of the present invention is larger than the wind receiving area of the conventional rotor.

Further, by disposing a field magnet and an armature on one of the rotor and the stator, when the field magnet is disposed at both ends of the yoke around which the coil constituting the armature is wound, Can be increased, the demagnetizing field is weakened, and the magnetic field is increased accordingly. When the magnetic field becomes stronger, the electromotive force generated by the electromagnetic induction effect by the field magnet, armature, and yoke increases, and the amount of power generation increases.
Furthermore, if the demagnetizing field is weakened, the field magnet is less likely to be demagnetized.

The invention according to claim 2 is characterized in that a field magnet and an armature are arranged in the stator and a yoke is arranged in the rotor.
As an action, if only the yoke is arranged on the rotor, the rotor becomes lighter and the startability of the rotor is improved.

The invention according to claim 3 is characterized in that the stator is a speed increasing cascade that increases the speed of the air flowing into the rotor.
As an action, the increased air is sent from the stator to the rotor to increase the rotational speed of the rotor.

  According to a fourth aspect of the present invention, there is provided a wind turbine generator comprising: a first rotor that rotates by receiving wind force; and a second rotor that has a relative speed with respect to the first rotor when rotating by receiving wind force. A field magnet and an armature are disposed on the first rotor, and a yoke is disposed on the second rotor so as to be opposed to the field magnet and the armature in order to form a magnetic flux of the field magnet. A magnet, an armature, and a yoke are arranged so as to be aligned in the axial direction of the rotation shafts of the first and second rotors.

  As an operation, the field magnet, the armature, and the yoke are arranged so as to be aligned in the axial direction of the rotation shafts of the first and second rotors. The diameters of the first and second rotors are smaller than those arranged side by side in the direction.

  Accordingly, the field magnet and armature of the present invention and the yoke are arranged in the axial direction of the rotation shafts of the first and second rotors, and the conventional permanent magnet and coil are arranged in the radial direction. When the rotor diameter is set to the same predetermined dimension with the one arranged side by side, the wind receiving area of the first and second rotors of the present invention is larger than the wind receiving area of the conventional rotor.

Further, by arranging the field magnet and the armature on one of the first and second rotors, when the field magnet is arranged at both ends of the yoke around which the coil constituting the armature is wound, the N pole And the S pole can be increased, the demagnetizing field is weakened, and the magnetic field is increased accordingly. When the magnetic field becomes stronger, the electromotive force generated by the electromagnetic induction effect by the field magnet, armature, and yoke increases, and the amount of power generation increases.
Furthermore, if the demagnetizing field is weakened, the field magnet is less likely to be demagnetized.

The invention according to claim 5 is characterized in that the first rotor and the second rotor rotate in opposite directions.
As an action, the relative speed between the first rotor and the second rotor increases, and the amount of power generation increases.

  In the invention according to claim 1, the field magnet and the armature are arranged on one of the rotor and the stator, and the yoke is arranged on the other side so as to face the field magnet and the armature in order to form a magnetic flux of the field magnet. In addition, since the field magnet, armature, and yoke are arranged so as to be aligned in the axial direction of the rotation axis of the rotor, the rotor diameter can be reduced and the rotor diameter is set to a predetermined dimension. The wind receiving area of the rotor can be made larger than before. Therefore, wind energy can be used effectively and the output of the wind power generator can be improved.

  Further, by arranging a field magnet and an armature on one of the rotor and the stator, when the field magnet is arranged at both ends of the yoke around which the coil constituting the armature is wound, the N pole and the S pole Can be increased, the demagnetizing field can be weakened, and the magnetic field can be increased accordingly.

  Therefore, the change in magnetic flux generated when the other yoke of the rotor and stator approaches or separates from the field magnet and armature is made larger than when only the permanent magnet is arranged on one of the rotor and stator. And a large electromotive force can be generated. Also from this, the output of the wind turbine generator can be improved.

  Further, the demagnetizing field is weakened, so that it is difficult to demagnetize the field magnet. Therefore, it can endure long-term power generation or power generation in a high temperature environment.

  In the invention according to claim 2, since the field magnet and the armature are arranged in the stator and the yoke is arranged in the rotor, the rotor can be reduced in weight, and the startability of the rotor can be improved. The output of the power generator can be increased.

  In the invention according to claim 3, since the stator is a speed increasing cascade that increases the speed of the air flowing into the rotor, the rotational speed of the rotor can be further increased by the stator, and the output of the wind power generator is improved. Can do.

  In the invention according to claim 4, the field magnet and the armature are disposed in the first rotor, and the yoke is disposed so as to be opposed to the field magnet and the armature in order to form the magnetic flux of the field magnet in the second rotor. In addition to the arrangement, the field magnet and armature, and the yoke are arranged so as to be aligned in the axial direction of the rotation shafts of the first and second rotors, so that the diameters of the first and second rotors are reduced. When the first and second rotor diameters are set to predetermined dimensions, the wind receiving areas of the first and second rotors can be made larger than before. Therefore, wind energy can be used effectively and the output of the wind power generator can be improved.

  Further, by arranging the field magnet and the armature in the first rotor, when the field magnet is arranged at both ends of the yoke around which the coil constituting the armature is wound, the N pole and the S pole The distance can be increased, the demagnetizing field can be weakened, and the magnetic field can be increased accordingly.

  Therefore, the change in the magnetic flux generated when the yoke of the second rotor approaches or separates from the field magnet and the armature can be made larger than when only the permanent magnet is arranged in the first rotor. A large electromotive force can be generated. Also from this, the output of the wind turbine generator can be improved.

  Further, the demagnetizing field is weakened, so that it is difficult to demagnetize the field magnet. Therefore, it can endure long-term power generation or power generation in a high temperature environment.

  In the invention according to claim 5, since the first rotor and the second rotor rotate in opposite directions, the relative speed between the first rotor and the second rotor can be increased. The output can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of a wind turbine generator (first embodiment) according to the present invention. A wind turbine generator 10 includes a nacelle 11 as a fuselage, a front rotor 12 rotatably attached to the nacelle 11, and The rear rotor 13, the power generation unit 14 attached to the front rotor 12 and the rear rotor 13, the power deriving unit 16 that guides the power generated by the power generation unit 14 to the outside, and the column 17 that supports the nacelle 11 It consists of.

The nacelle 11 is a member in which a rotating shaft 21 attached to the front rotor 12 and a cylindrical rotating shaft 22 attached to the rear rotor 13 are rotatably provided.
The front rotor 12 includes a cap 24 attached to the front end of the rotating shaft 21 and a plurality of rotor blades 25 attached to the cap 24.
The rear rotor 13 includes a cap 27 attached to the front end of the cylindrical rotary shaft 22 and a plurality of rotor blades 28 attached to the cap 27, and rotates backward with respect to the front rotor 12.

  The power generation unit 14 includes a power generation body 31 provided at the front part of each rotor blade 28 of the rear rotor 13 and a yoke 32 provided at the rear part of each rotor blade 25 of the front rotor 12. An electromotive force is induced by an electromagnetic induction action when and are approaching or leaving.

  The wind power generator 10 of the present invention is provided with the power generation unit 14 in the front rotor 12 and the rear rotor 13, so that the nacelle 11 and the cap 24, It becomes possible to make 27 small, especially a small diameter, the front rotor 12 and the rear rotor 13 can be enlarged correspondingly, and a wind receiving area can be enlarged. Moreover, since the wind power generator 10 is not provided with a gearbox, the structure is simplified.

2A and 2B are front views (first embodiment) of a front rotor and a rear rotor according to the present invention.
The front rotor 12 shown in (a) includes two rotor blades 25 and 25, and the yoke 32 has a longitudinal direction passing through the center of the rotation shaft 21 and a center line located on the rotor blades 25 and 25. 26 along the width of the rotor blade 25.

  The rear rotor 13 shown in (b) includes two rotor blades 28, 28, and the power generation main body 31 has its longitudinal direction passing through the center of the cylindrical rotary shaft 22 and positioned on the rotor blades 28, 28. It is arranged inside the width of the rotor blade 28 along the center line 29.

FIG. 3 is a cross-sectional view of the main part of the wind turbine generator (first embodiment) according to the present invention, and the cylindrical rotary shaft 22 is supported inside the nacelle 11 through a pair of bearings 41 and 42 so as to be rotatable. The rotary shaft 21 is supported inside the cylindrical rotary shaft 22 through a pair of bearings 43 and 44 so as to be rotatable.
The power generation body 31 provided in the rear rotor 13 includes an armature 51 and two permanent magnets 52 and 52 as two field magnets attached to the front portions of both ends of the armature 51.
The armature 51 includes a yoke 54 and a coil 56 wound around a protrusion 54 a provided at the center of the yoke 54.
The above-described yokes 32 and 54 are preferably made of a magnetically permeable material such as an electromagnetic steel plate.

  The power deriving unit 16 is connected to the conductors 61 and 62 wired from the coils 56 included in each power generation body 31 into the rotor blade 28, the cap 27, and the cylindrical rotating shaft 22, and connected to these conductors 61 and 62 and is a cylinder. A pair of slip rings 63, 63 attached to the outer peripheral surface of the rotating shaft 22, and a brush 66 attached to the inner surface of the nacelle 11 for taking out electric power outside while sliding with these slip rings 63, 63, 66 and power take-out conductors 71 and 72 connected to the brushes 66 and 66.

4 (a) and 4 (b) are operation diagrams showing the operation of the power generation unit of the wind turbine generator (first embodiment) according to the present invention.
In (a), when the yoke 32 of the front rotor does not face the power generation body 31 of the rear rotor, the magnetic flux generated by the permanent magnets 52 and 52 is unlikely to be generated in the protrusion 54 a of the yoke 54.

  In (b), when the yoke 32 faces the power generation body 31, a magnetic flux is generated from the permanent magnet 52 and passes through the protrusion 54 a of the yoke 54 and the yoke 32, and an electromotive force is generated in the coil 56 due to electromagnetic induction. .

In the present invention, since the permanent magnets 52 and 52 are arranged as field magnets at both ends of the yoke 54 of the armature 51 including the yoke 54 and the coil 56, only the permanent magnet 52 is arranged without the conventional yoke 54. Compared to the above, the magnetic flux density can be increased and the distance between the two permanent magnets 52, 52 can be increased, so that the demagnetizing field can be weakened and the magnetic field against the demagnetizing field is stronger. Thus, the induced electromotive force is also increased.
In addition, if the demagnetizing field is weak, the permanent magnets 52 and 52 are less likely to be demagnetized and can be used for a longer period of time and at higher temperatures.

  As shown in FIG. 1 above, the present invention has a rear rotor 13 as a first rotor that rotates by receiving wind force, and a first rotor having a relative speed with respect to the rear rotor 13 when rotating by receiving wind force. In the wind power generator 10 including the front rotor 12 as the second rotor, the permanent magnet 52 and the armature 51 as the field magnets are disposed in the rear rotor 13, and the magnetic flux of the permanent magnet 52 is applied to the front rotor 12. In order to form the yoke 32 so as to be opposed to the permanent magnet 52 and the armature 51, the permanent magnet 52 and the armature 51 and the yoke 32 are connected to the rotating shafts of the rear rotor 13 and the front rotor 12, that is, It arrange | positions so that it may be located in a line with the axial direction of the cylindrical rotating shaft 22 and the rotating shaft 21, It is characterized by the above-mentioned.

  Thereby, the diameter of the rear rotor 13 and the front rotor 12 can be reduced, and when the rotor diameter of the rotor blades 28 and 25 is set to a predetermined dimension, the wind receiving area of the rear rotor 13 and the front rotor 12 Can be made larger than before. Therefore, wind energy can be used effectively and the output of the wind power generator 10 can be improved.

  Further, by arranging the permanent magnet 52 and the armature 51 in the rear rotor 13, when the permanent magnet 52 is arranged at both ends of the yoke 54 around which the coil 56 constituting the armature 51 is wound, the N pole and the S The distance to the pole can be increased, the demagnetizing field can be weakened, and the magnetic field can be increased accordingly.

  Therefore, the change in magnetic flux generated when the yoke 32 of the front rotor 12 approaches or separates from the permanent magnet 52 and the armature 51 is compared with, for example, the case where only the permanent magnet is disposed in the rear rotor. Then, it can be increased and a large electromotive force can be generated. Also from this, the output of the wind turbine generator can be improved.

  Furthermore, the demagnetizing field is weakened, so that the permanent magnet 52 can be made difficult to demagnetize. Therefore, it can endure long-term power generation or power generation in a high temperature environment.

Further, the present invention is characterized in that the rear rotor 13 and the front rotor 12 rotate in opposite directions.
Thereby, the relative speed of the rear rotor 13 and the front rotor 12 can be increased, and the output of the wind power generator 10 can be improved.

FIG. 5 is a cross-sectional view of the wind turbine generator (second embodiment) according to the present invention. The same components as those in the first embodiment shown in FIG.
The wind power generator 80 is attached to the nacelle 11, a front stator 81 attached to the nacelle 11, a rear rotor 83 rotatably attached to the nacelle 11, and the front stator 81 and the rear rotor 83. The power generation unit 14, conductive wires 86 and 87 for guiding the power generated by the power generation unit 14 to the outside, and the support 17.

  The nacelle 11 is a member in which a fixed shaft 88 attached to the front stator 81 is attached via a rear end support member 91, and a cylindrical rotary shaft 22 attached to the rear rotor 83 is rotatably provided.

  The cylindrical rotary shaft 22 is rotatably supported by the nacelle 11 via a pair of bearings 41 and 42 and is rotatably supported by the fixed shaft 88 via a pair of bearings 43 and 44.

The front stator 81 includes a cap 24 attached to the front end of the fixed shaft 88 and a plurality of stator blades 94 attached to the cap 24, and a speed-up blade cascade for increasing the speed of air flowing into the rear rotor 83. It is what.
The rear rotor 83 includes a cap 27 and a plurality of rotor blades 96 attached to the cap 27.

The power generation body 31 of the power generation unit 14 is attached to the rear part of the stator blade 94 of the front stator 81, and the yoke 32 of the power generation part 14 is attached to the front part of the rotor blade 96 of the rear rotor 83.
As described above, since the yoke 32 that is lighter than the power generation body 31 is attached to the rear rotor 83, the startability of the rear rotor 83 can be improved. Therefore, even if the wind speed changes, the rotational speed of the rear rotor 83 can easily follow the wind speed, and the output of the wind power generator 80 can be increased.

  The conducting wires 86 and 87 are wired from the coil 56 provided in each power generation main body 31 to the stator blade 94, the cap 24, the fixed shaft 88, the rear end support member 91, the outer surface (or inner surface) of the nacelle 11, and the support column 17. .

  As shown in FIG. 5 above, the present invention is a wind turbine including a rear rotor 83 that rotates by receiving wind force, and a front stator 81 that is disposed in the front stream (or rear stream) of the rear rotor 83. In the power generation device 80, the permanent magnet 52 and the armature 51 as field magnets are arranged on one of the rear rotor 83 and the front stator 81, and the permanent magnet 52 and armature are formed on the other to form the magnetic flux of the permanent magnet 52. The yoke 32 is disposed so as to be able to face 51, and the permanent magnet 52, the armature 51, and the yoke 32 are disposed so as to be aligned in the axial direction of the cylindrical rotating shaft 22 as the rotating shaft of the rear rotor 83. Features.

  Thereby, the diameter of the rear rotor 83 can be reduced, and when the rotor diameter of the rear rotor 83 is set to a predetermined dimension, the wind receiving area of the rear rotor 83 can be made larger than before. Therefore, wind energy can be used effectively and the output of the wind power generator 80 can be improved.

  Further, by arranging the permanent magnet 52 and the armature 51 on one of the rear rotor 83 and the front stator 81, the permanent magnet 52 is arranged at both ends of the yoke 54 around which the coil 56 constituting the armature 51 is wound. In this case, the distance between the N pole and the S pole can be increased, the demagnetizing field can be weakened, and the magnetic field can be increased accordingly.

  Therefore, a change in magnetic flux generated when the other yoke 32 of the rear rotor 83 and the front stator 81 approaches or leaves the permanent magnet 52 and the armature 51 is, for example, permanently applied to one of the rear rotor and the front stator. Compared with the case where only the magnet is disposed, the present invention can increase the size and generate a large electromotive force. Also from this, the output of the wind power generator 80 can be improved.

  Further, the demagnetizing field is weakened, so that it is difficult to demagnetize the field magnet. Therefore, it can endure long-term power generation or power generation in a high temperature environment.

The present invention is characterized in that the permanent magnet 52 and the armature 51 are arranged on the front stator 81 and the yoke 32 is arranged on the rear rotor 83.
Thereby, the rear rotor 83 can be reduced in weight, the startability of the rear rotor 83 can be improved, and the output of the wind power generator 80 can be increased.

The present invention is characterized in that the front stator 81 is a speed increasing blade row for increasing the speed of air flowing into the rear rotor 83.
Thereby, the rotational speed of the rear rotor 83 can be further increased by the front stator 81, and the output of the wind power generator 80 can be improved.

  In this embodiment, as shown in FIG. 1, the yoke 32 is disposed on the front rotor 12 and the power generation body 31 is disposed on the rear rotor 13, but this is not limiting, and the power generation body 31 and rear portion are disposed on the front rotor 12. The yoke 32 may be disposed on the rotor 13 and the turning angle of the rotor blade 28 of the rear rotor 13 may be made larger than the turning angle of the rotor blade 25 of the front rotor 12.

  Moreover, as shown in FIG. 3, although the ball bearing was used as the bearings 41-44, it is not restricted to this, You may use a needle bearing and a radial bearing (sliding bearing). By using these needle bearings and radial bearings, the nacelle can be made smaller in diameter, and the wind receiving area of the rotor can be further increased.

  Further, as shown in FIG. 5, the front stator 81 is arranged on the upstream (front flow) side of the wind of the rear rotor 83, but not limited to this, on the downstream (rear flow) side of the wind of the rear rotor 83. A stator such as a guide vane (guide vane) may be disposed. Further, although the power generation body 31 is disposed in the front stator 81, the present invention is not limited thereto, and the power generation body 31 may be disposed on a pillar or the like disposed so as to be close to the rear rotor 83.

Furthermore, the respective combinations of the rotor blade 25 of the front rotor 12 and the rotor blade 28 of the rear rotor 13 shown in FIG. 1, and the stator blade 94 of the front stator 81 and the rotor blade 96 of the rear rotor 83 shown in FIG. In this case, a field magnet and an armature may be provided in a direction with a smaller turning angle.
Furthermore, the wind power generator of the present invention may be mounted on the ground (for example, for hybrid vehicles and fuel cell vehicles) in addition to being fixed on the ground.

  The present invention is suitable for a small wind power generator.

It is sectional drawing of the wind power generator (1st Embodiment) which concerns on this invention. 1 is a front view (first embodiment) of a front rotor and a rear rotor according to the present invention. It is principal part sectional drawing of the wind power generator (1st Embodiment) which concerns on this invention. It is an operation | movement figure which shows the effect | action of the electric power generation part of the wind power generator (1st Embodiment) which concerns on this invention. It is sectional drawing of the wind power generator which concerns on this invention (2nd Embodiment). It is a front view of the conventional wind power generator. It is sectional drawing of the conventional wind power generator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,80 ... Wind power generator, 12 ... 2nd rotor (front rotor), 13 ... 1st rotor (rear rotor), 21, 22 ... Rotating shaft, 32 ... Yoke, 51 ... Armature, 52 ... Field Magnet magnet (permanent magnet), 81... Stator (front stator), 83... Rotor (rear rotor).

Claims (5)

In a wind turbine generator that includes a rotor that rotates by receiving wind power and a stator that is arranged in the upstream or downstream of the rotor,
A field magnet and an armature are disposed on one of the rotor and the stator, and a yoke is disposed on the other side so as to be opposed to the field magnet and the armature in order to form a magnetic flux of the field magnet. A wind power generator characterized in that a field magnet, the armature, and the yoke are arranged so as to be aligned in an axial direction of a rotating shaft of the rotor.   The wind turbine generator according to claim 1, wherein the field magnet and the armature are arranged on the stator, and the yoke is arranged on the rotor.   The wind turbine generator according to claim 1 or 2, wherein the stator is a speed increasing blade row that increases a speed of air flowing into the rotor. In a wind turbine generator comprising: a first rotor that rotates by receiving wind force; and a second rotor that has a relative speed with respect to the first rotor when rotating by receiving wind force.
A field magnet and an armature are disposed on the first rotor, and a yoke is disposed on the second rotor so as to face the field magnet and the armature in order to form a magnetic flux of the field magnet. The wind power generator, wherein the field magnet, the armature, and the yoke are arranged so as to be aligned in the axial direction of the rotation shafts of the first and second rotors.   The wind turbine generator according to claim 4, wherein the first rotor and the second rotor rotate in opposite directions.

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