JP2008082251A - Electric power plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power plant having run-out of a shaft and cogging not easily arise, stabilizing power generating characteristics during rotation, reducing torsional load on a rotary shaft, and having drop of power generating efficiency due to eddy current loss not easily arise. <P>SOLUTION: This electric power plant is provided with a first rotor 41 provided with a field magnet 101 connected to a windmill rotating in reverse direction respectively, and a second rotor 42 provided with a power generation coil 102 rotating in a reverse direction to the first rotor 41 as one unit with a second rotation input part 30 and excited by the field magnet 101. An axial gap type generator 40 is constructed to make the power generation coil 102 and the field coil 101 oppose in a rotation axis line M direction by arranging a plurality of power generating coil 102 constructed in a flat hollow shape in such a manner that each axis line direction is kept consistent with the rotation axis line M direction around the rotation axis line M in the second rotor 42, and arranging a plurality of field magnet 101 in such a manner that the same is magnetized in each rotation axis line M direction around the rotation axis line M in the first rotor 41. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power generator.

Japanese Patent Application Laid-Open No. 2004-211707

In Patent Document 1, a first rotor provided with a field magnet and a rotor provided with a power generating coil are connected to wind turbines that rotate in opposite directions when receiving wind from the same direction, respectively. There has been disclosed a wind turbine generator in which the relative rotational speed between the field magnet and the power generating coil is doubled with respect to the wind turbine rotational speed to increase the power generation efficiency. In addition, the following has been described as an effect.
When a relatively heavy field magnet and power generation coil are concentrated around the windmill rotation axis in the form of a first rotor and a second rotor, respectively, resulting in a kind of flywheel effect and the wind speed is not constant However, the rotation can be stabilized.
-In particular, by setting the rotation axis to be vertical, the gyro effect is likely to occur, and even when the wind is strong, the rotation axis is less likely to be shaken and stable rotation is possible.
Since the first rotor and the second rotor rotate in the opposite directions together with the upper and lower wind turbines, it is possible to cancel the rotational torsional load on the wind turbine rotating shaft, which is advantageous in terms of structural strength.

The generator adopted in the wind power generator of Patent Document 1 is a so-called radial gap type, and the generator coil on the second rotor side is in the radial direction with respect to the field magnet attached to the outer peripheral surface of the first rotor. It has a structure facing the outside. As a result, the following problems occur.
(1) Since the power generation coil is located outside the field magnet in the radial direction, the rotation radius of the second rotor provided with the power generation coil is necessarily larger than the rotation radius of the first rotor. And in the second rotor, the load of the heavy iron core type coil concentrates on the large radius position, and as a result, the moment of inertia becomes significantly larger than that of the first rotor, and the rotational inertia force of the upper and lower wind turbines is likely to be unbalanced, There is a problem that power generation characteristics at a low wind speed are difficult to stabilize. Further, the effect of canceling the rotational torsional load applied to the windmill rotating shaft cannot be sufficiently achieved.
(2) The axial dimensions of the power generating coil and the field magnet are likely to increase, and the power generating coil is cored, which is disadvantageous in reducing the weight of the entire power generating device. Further, since the load is likely to be dispersed in the axial direction, the flywheel effect (or gyro effect) is not always sufficient (particularly on the second rotor side having a small turning radius). As a result, the rotation axis is likely to be shaken during a strong wind.
(3) Since the field repulsive force between the coil and the magnet is generated in the radial direction, it is likely to cause rotational axis fluctuation and cogging.
(4) Since the power generation coil is a cored type, the eddy current loss is large and the power generation efficiency tends to deteriorate. Also, the generator is likely to generate heat.

  The problems of the present invention are that the rotating shaft shake and cogging are less likely to occur, the power generation characteristics during wind speed rotation can be further stabilized, the torsional load on the rotating shaft can be reduced, and the power generation efficiency is reduced due to eddy current loss. Another object of the present invention is to provide a power generation device that is less likely to cause a problem.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the power generation device of the present invention includes:
A first rotation input unit that is arranged in a form that coincides with the rotation axis at a first position on the reference axis, and that rotates in a first direction in response to a fluid flow serving as a power generation drive source;
A second rotation input unit that is arranged at a second position different from the first position on the reference axis, and that rotates in a direction opposite to the first rotation input unit when receiving a fluid flow from the same direction;
A first rotor provided with a field magnet, and a second rotor provided with a power generation coil that rotates integrally with the second rotation input portion in the opposite direction to the first rotor and is excited by the field magnet; And a generator with
In the generator, a plurality of power generation coils configured in an air-core flat shape are arranged around the rotation axis so that the power generation coil and the field magnet are opposed to each other so as to form an air gap in the rotation axis direction. An axial gap generator in which the axial direction is aligned with the rotational axis direction and a plurality of field magnets are magnetized around the rotational axis in the first rotor. It is comprised as follows.

According to the configuration of the present invention, since the generator is configured as an axial gap generator as described above, the following effects can be achieved.
(1) Since the field magnet and the power generation coil face each other in the axial direction, the first rotor provided with the field magnet and the second rotor provided with the power generation coil are arranged at substantially the same radial position. The weights of the magnet for power generation and the coil for power generation are concentrated, and the difference in the moment of inertia around the rotation axis is unlikely to occur. As a result, the rotational inertia force of the upper and lower rotational input units (for example, windmills) is less likely to be unbalanced, and the power generation characteristics during low-speed rotation are likely to be stable. In addition, the effect of canceling the rotational torsional load on the rotating shaft can be greatly enhanced, and this has an advantageous effect on the structural strength.
(2) Since both the power generation coil and the field magnet can be made thin and the power generation coil is an air-core type, it greatly contributes to the weight reduction of the entire power generation apparatus. Further, since the loads of the power generating coil and the field magnet are relatively concentrated in the axial direction, the flywheel effect is greatly enhanced. As a result, it is possible to effectively suppress the rotational shaft shake during strong winds and the like.
(3) Since the field repulsive force between the coil and the magnet is generated in the axial direction, it is difficult to cause rotational shaft shake and cogging.
(4) Since the power generation coil is an air-core type, eddy current loss is small and power generation efficiency is good. Moreover, the heat generation of the generator is also suppressed.

  In this case, a slip ring connected to each of the plurality of power generating coils is provided on the second rotation shaft that couples the second rotor and the second rotation input unit, and slides on the slip ring on the second rotation shaft. The power generation output from the power generation coil can be taken out through the brush. Thereby, in the generator structure in which both the first rotor and the second rotor rotate, the power generation output can be taken out without any problem.

  The first rotor has a disk-shaped rotor body to which a field magnet is attached on a surface facing the power generating coil of the second rotor, and the first rotating shaft formed separately from the second rotating shaft is It can be set as the structure couple | bonded with this rotor main body so that integral rotation is possible. By attaching a field magnet to the disc-shaped rotor body, the first rotor can be flattened, which contributes to further improvement of the flywheel effect. The field magnet may be composed of a flat permanent magnet magnetized in the thickness direction. In particular, it is small to employ a rare earth magnet (for example, a rare earth (Nd, Dy, Pr) -Fe-B magnet or a rare earth (Sm) -Co magnet) that can generate a strong magnetic field even with a flat magnet. It is effective in realizing a high-output generator. The flat magnet refers to a magnet having t / s of less than 1 (particularly less than 0.5), where s is the square root of the cross-sectional area of the main surface (magnetized surface) and t is the dimension in the thickness direction. .

  The first rotor has a disk-shaped auxiliary rotor body facing the power generation coil of the second rotor in the axial direction from the opposite side of the rotor body, and the power generation coil of the auxiliary rotor body The auxiliary field magnet having a polarity opposite to that of the field magnet can be installed at a position corresponding to the field magnet on the rotor main body side on the opposite surface. In this case, the rotor main body and the auxiliary rotor main body are connected to each other by a peripheral wall portion that surrounds the second rotor in the circumferential direction at the outer peripheral edge so that the rotor main body, the peripheral wall portion, and the auxiliary rotor main body are soft magnetic metal materials. A field yoke made of When configured as described above, a strong and concentrated magnetic field can be generated in the axial direction between the field magnet and the auxiliary field magnet, and the rotor body, the auxiliary rotor body, and the peripheral wall portion are made of a soft magnetic metal material. By configuring a field yoke made of (for example, permalloy), the leakage magnetic field can be greatly reduced, and the power generation efficiency can be further increased.

  In this case, more specifically, it can be configured as follows. That is, a cylindrical first bearing sleeve protrudes from the main surface of the rotor body opposite to the second rotor and surrounds the rotation axis, and is separated from the second rotation shaft. The rotary shaft is coupled to a shaft coupling shield that blocks the tip of the first bearing sleeve so as to be integrally rotatable. A cylindrical second bearing sleeve projects from the main surface of the auxiliary rotor body opposite to the second rotor. Then, the second rotating shaft passes through the second bearing sleeve and the second rotor from the second rotating input portion side, the tip portion enters the first bearing sleeve, and the second rotating shaft is on both sides of the second rotor in the axial direction. Between the one bearing sleeve and the second bearing sleeve and the second rotating shaft, there is disposed a main bearing that supports the first rotor with respect to the second rotor in a form allowing relative rotational sliding of both of them. With this structure, the first rotor has a shape that encloses the field rotor and the power generation coil forming the power generation function section by the field yoke portion, the first bearing sleeve, and the second bearing sleeve, and rotates. Since the sliding portion is sealed by the main bearing, it is possible to prevent water droplets, foreign matter, and the like from entering the power generation function unit from the outside. In particular, when the field magnet is composed of a rare earth (Nd, Dy, Pr) -Fe-B based magnet that easily undergoes oxidative degradation, it can be said that the structure is effective.

  In the above structure, it is further preferable that a non-rotating generator case is provided so as to cover the first rotor from the outside. In this case, the second rotating shaft and the first rotating shaft extend outward in the axial direction from the inside of the generator case at corresponding shaft through holes formed in the wall portion of the generator case, respectively. It can be set as the structure which has arrange | positioned the auxiliary bearing between each through-hole corresponding to a 2nd rotating shaft and a 1st rotating shaft. In this way, the outer side of the first rotor is further protected by the generator case, and the space between the generator case and the second rotating shaft and the first rotating shaft is sealed by the auxiliary bearing. Water droplets and foreign matter cannot enter the power generation function section unless they break through both the auxiliary bearing and the main bearing, and the protection effect is further enhanced.

  In this case, a shaft through hole can be formed in the inner peripheral surface of the cylindrical auxiliary bearing sleeve projecting in the axial direction from the outer surface of the wall portion of the generator case, and the auxiliary bearing can be arranged in the auxiliary bearing sleeve. In this case, a plurality of fins for reinforcement and heat dissipation can be provided radially so as to connect the outer peripheral surface of the auxiliary bearing sleeve and the outer wall surface of the generator case. In this way, it is possible to increase the breakage strength of the auxiliary bearing sleeve that receives the radial load applied to the rotating shaft via the auxiliary bearing, and it is possible to efficiently radiate the generator even during high-output power generation. .

The power generation device of the present invention is a Saponius type windmill in which a plurality of wind turbine blades that receive wind in directions orthogonal to the rotation axis are arranged around the rotation axis. Thus, the wind turbine generator can be configured as a first wind turbine and a second wind turbine that rotate in opposite directions by receiving wind in the same direction. By applying it to a wind turbine generator, the following more specific effects can be achieved.
(1) Unbalance in the rotational inertia force of the windmill is unlikely to occur, and power generation characteristics at low wind speeds are likely to be stable. In addition, the effect of canceling the rotational torsion load applied to the windmill rotating shaft is greatly enhanced, and the structure strength is also advantageous.
(2) As a result of the above-mentioned flywheel effect being greatly enhanced, it is possible to effectively suppress rotational shaft shake during strong winds or when the wind flies. In particular, when the first windmill, the second windmill, and the generator are provided with a support frame that supports the rotation axis to be vertical, the gyro effect on the rotation shaft is remarkably enhanced, and the rotation shaft shake is suppressed. Is very prominent.
Note that the first rotation input unit and the second rotation input unit are not limited to wind turbines, and may be applied to other power generation methods by being configured as a water turbine or a turbine blade, for example.

  When comprised as a wind power generator, the first windmill and the second windmill can each be constructed as follows. First, in the reference rotation direction that is determined around the rotation axis of each wind turbine blade and opposite to each other in the first wind turbine and the second wind turbine, the blade surface located on the front side is defined as the front blade surface, and also on the rear side The blade surface located at the rear is defined as the rear blade surface, the edge on the side close to the rotational axis of each wind turbine blade is defined as the blade inner edge, and the edge on the far side is defined as the blade outer edge. Around the rotation axis, the plurality of wind turbine blades are supported so as to be integrally rotatable by the blade support so that the blade inner edge is located at a certain distance in the radial direction from the rotation axis. Further, in the cross section orthogonal to the rotation axis, each wind turbine blade has a concave curved surface in which the rear blade surface is retracted to the front side in the reference rotation direction, the front blade surface protrudes to the front side in the reference rotation direction, and is more than the rear blade surface. Further, the front wing surface has a maximum curvature at the curved nose portion, and the curvature decreases from the curved nose portion toward the blade inner edge side and the blade outer edge side, respectively. The surface length of the first surface from the curved nose portion to the outer edge of the blade is also a streamline shape larger than the surface length of the second surface to the inner edge of the blade. When a relative airflow is received from the front side in the reference rotation direction on the front blade surface, the first surface and the second surface are the velocity of the relative airflow generated along the first surface from the curved nose portion toward the outer edge of the blade. Are functioning as a high-speed airflow passage surface and a low-speed airflow passage surface so as to be larger than the velocity of the relative airflow generated along the second surface toward the blade inner edge, respectively. The Savonius type wind turbine is configured such that the lift torque based on the difference in flow velocity of the relative air flow is generated in the direction of rotating the wind turbine blade in the reference rotational direction on the rear blade surface side.

  According to the above configuration, the wind turbine blade of the Saponius type wind turbine is viewed from the front blade surface side by making the front blade surface into a curved streamline shape having a specific shape in which the high-speed airflow passage surface and the low-speed airflow passage surface are formed. When wind is received in the headwind mode, the lift torque based on the difference in the flow velocity of the relative airflow between the high-speed airflow passage surface and the low-speed airflow passage surface can be superimposed on the direct rotational torque due to the wind. By making the surface a concave curved surface, it is possible to receive wind efficiently when wind is received in a tailwind mode. As a result, the conversion efficiency of wind power into wind turbine rotational force can be significantly increased, and the startability of the wind turbine at low wind speeds can be dramatically improved.

  In order to enhance the above effect, it is effective to make the wind receiving cross-sectional area of the high-speed airflow passage surface larger than that of the low-speed airflow passage surface. For this purpose, the average curvature of the high-speed airflow passage surface should be set larger than the average curvature of the low-speed airflow passage surface. Further, in a cross section orthogonal to the rotation axis, a straight line connecting the rotation axis and the blade inner edge is defined as a first straight line, and a first angle formed by a second straight line circumscribing the front blade surface through the rotation axis and the first straight line is It is also effective to set the angle smaller than the second angle formed by the third straight line passing through the blade outer edge and the first straight line.

  In this case, in order to efficiently contribute to the lift by the flow velocity difference, it is important to make it difficult for the airflow that has passed through the low-speed airflow passage surface to form a vortex on the rear wing surface side. In the cross section perpendicular to each other, it is desirable that each wind turbine blade has an average curvature of the rear blade surface smaller than an average curvature of the front blade surface, that is, the curved depth of the rear blade surface is not excessively increased. Further, from the viewpoint of suppressing vortex flow (or turbulent flow), the wind turbine blade may be formed as a ridge line portion in which the blade inner edge and the blade outer edge form an intersection line between the curved front blade surface and the rear blade surface, respectively. Good.

  The blade support body is configured such that a wind tunnel having an air outflow entrance is formed between adjacent wind turbine blades with respect to a cylindrical space including the blade inner edge of each wind turbine blade arranged around the rotation axis. It is good to comprise as what supports so that integral rotation is possible. By forming the wind tunnel portion, wind can be applied to the wind turbine blades located behind the wind turbine rotation axis with respect to the wind receiving direction, and the conversion efficiency of wind power into wind turbine rotational force can be further increased. In order to achieve this effect more remarkably, two or more wind turbine blades are arranged at equal angular intervals around the rotation axis, and two wind turbine blades pass through the wind tunnel from the air outflow entrance formed between the two wind turbine blades. It is preferable to adopt a structure in which a wind turbine blade different from the wind turbine blade can receive wind on the rear blade surface. In this case, since the rear wing surface has the concave curved shape as described above, the wind hitting the rear wing surface is redirected so as to be wound in the rotation axis direction, and the wind passing through the wind tunnel is Effectively guided by the windmill wings. For example, in the cross section orthogonal to the other wind turbine blade rotation axis, if it is formed in a partial cylindrical surface with a constant curvature and the rotation axis is positioned on a virtual cylindrical surface including the rear blade surface, the effect is enhanced. It is advantageous.

  In order to effectively form the wind tunnel part as described above, the blade support body should be formed so as to support each wind turbine blade on the end surface in the rotation axis direction so that an extra obstacle does not occur at the wind tunnel part forming position. Is desirable. Specifically, the wing support body includes a main body plate that forms an axial end portion of the wind tunnel portion and a rotation support portion of the windmill, and radially extends radially outward from the outer peripheral edge of the main body plate. It can comprise as a thing provided with the support arm plate attached to the end surface of a windmill blade. The support arm plate can be attached to the end face of the wind turbine blade along the blade inner edge.

  By using a sheet metal hollow body made of an aluminum alloy as the wind turbine blade, the wind turbine blade having a large wind receiving area can be configured with light weight and high strength. From the viewpoint of reducing the weight and improving the strength by reducing the thickness, the aluminum alloy used is an aging precipitation strengthened aluminum alloy (for example, Al-Cu alloy (JIS: A2017 (duralumin)), Al-Cu-Mg alloy ( JIS: A2024 (super duralumin)), Al—Zn—Mg—Cu alloy (JIS: A7075 (extra super duralumin))) is preferably used.

Further, the wind turbine blade may be a sheet metal hollow body sealed with a filling gas having a gas specific gravity smaller than that of air (gas specific gravity: 1, gas density: 1.2935 kg / Nm ³ ). The apparent weight of the wind turbine blade can be further reduced by the buoyancy caused by the filling gas, which further contributes to weight reduction. As the filling gas, helium gas (gas specific gravity: 0.1382, gas density: 0.1786 kg / m ³ ) or hydrogen gas (gas specific gravity: 0.0695, gas density: 0.0899 kg / m ³ ) should be adopted. Can do. Further, “a wind turbine blade made of a sheet metal hollow body in which a filling gas having a smaller gas specific gravity than air is sealed” is an invention that can be implemented independently of the present invention.

  As shown in FIG. 6, the power generation device 10 is configured as a wind power generation device including a support frame 12, a first windmill 20, a second windmill 30, and a generator 40. As shown in the exploded perspective view of FIG. 11, the first windmill 20 is arranged in such a manner that the rotation axis M coincides with the first position (upper side) on the reference axis, and the first windmill 20 is constant regardless of the direction from which the wind is received. Rotate in the direction. On the other hand, the second wind turbine 30 is disposed at a second position (lower side) different from the first position on the reference axis, and when receiving wind from the same direction, the first wind turbine 30 receives the wind from any direction. The wind turbine 20 is configured to rotate in the opposite direction.

  FIG. 1 is an enlarged view of the inside of the generator 40. The first rotor 41 provided with a field magnet 101 and the second rotation input unit 30 rotate integrally with the first rotor 41 in the opposite direction. And a second rotor 42 provided with a power generating coil 102 excited by the field magnet 101. In the second rotor 42, a plurality of power generating coils 102 that are flat in the air core are arranged so that the power generating coil 102 and the field magnet 101 face each other in a form that forms an air gap in the rotation axis M direction. A plurality of field magnets 101 are magnetized in the direction of the rotation axis M around the rotation axis M in the first rotor 41. The first rotor 41 is arranged around the rotation axis M so that the axis direction coincides with the direction of the rotation axis M. It is comprised as the axial gap type generator 40 arranged in the form.

  A slip ring 136 connected to each of the plurality of power generating coils 102 is provided on the second rotation shaft 52 that couples the second rotor 42 and the second rotation input unit 30. The power generation output from the power generation coil 102 is taken out via a brush 135 that slides on the slip ring 136.

  The first rotor 41 has a disk-shaped rotor body 103 to which the field magnet 101 is attached on the surface of the second rotor 42 facing the power generation coil 102, and is separated from the second rotating shaft 52. One rotary shaft 50 is coupled to the rotor body 103 so as to be integrally rotatable by bonding. The field magnet 101 is composed of a flat permanent magnet magnetized in the thickness direction, specifically, a rare earth (Nd, Dy, Pr) -Fe-B system magnet, as shown in FIG. The poledness between adjacent ones in the rotational circumferential direction is alternately reversed. As shown in FIG. 3, the second rotor 42 has a coil support frame 106 to which the second rotating shaft 52 is fixed so as to be integrally rotatable, and a plurality of coil attachments are formed in the circumferential direction of the coil support frame 106. The aforementioned air-core flat power generating coil 102 is assembled to the window 130 so that the coil axial direction (cavity opening direction) faces the axial direction and the winding directions of adjacent coils are opposite to each other. ing.

  Returning to FIG. 1, the first rotor 41 has a disk-like auxiliary rotor body 104 facing the power generation coil 102 of the second rotor 42 from the opposite side to the rotor body 103 in the axial direction. A plurality of auxiliary magnets magnetized in a direction opposite to the field magnet 101 at positions corresponding to the field magnet 101 on the rotor body 103 side on the surface of the auxiliary rotor body 104 facing the power generation coil 102. A field magnet 105 is mounted (the mounting form is the same as the field magnet 102 shown in FIG. 2, but the magnetized surface of the field magnet 102 facing the power generation coil 102 is N (S ), The magnetized surface of the corresponding auxiliary field magnet 105 is S (N).

  The rotor main body 103 and the auxiliary rotor main body 104 are coupled to each other by a peripheral wall portion 106 that surrounds the second rotor 42 in the circumferential direction at the outer peripheral edge. The rotor body 103, the peripheral wall portion 106, and the auxiliary rotor body 104 constitute a field yoke made of a soft magnetic metal material (permalloy in this embodiment). A cylindrical first bearing sleeve 122 projects from the main surface of the rotor body 103 opposite to the second rotor 42 so as to surround the rotation axis M, and is separated from the second rotation shaft 52. Further, the first rotary shaft 50 is coupled to the shaft coupling shield 108 that closes the tip of the first bearing sleeve 122 so as to be integrally rotatable. In addition, a cylindrical second bearing sleeve 109 is formed to protrude from the main surface of the auxiliary rotor body 104 opposite to the main surface facing the second rotor 42. The second rotation shaft 52 penetrates the second bearing sleeve 109 and the second rotor 42 from the second rotation input portion 30 side, and the tip portion enters the first bearing sleeve 122. On both sides of the second rotor 42 in the axial direction, between the first bearing sleeve 122 and the second bearing sleeve 109 and the second rotating shaft 52, the first rotor 41 is relative to the second rotor 42. A main bearing 110 is arranged to be supported in a form that allows rotational sliding. The first rotor 41 wraps the field magnet 101 and the power generating coil 102 that form the function section of the generator 40 by the field yoke portion, the first bearing sleeve 122 and the second bearing sleeve 109 described above. Since it has a shape and the rotary sliding portion is sealed by the main bearing 110, it is possible to prevent water droplets, foreign matter, and the like from entering the generator 40 function section from the outside.

  A non-rotating generator case 120 is provided so as to cover the first rotor 41 from the outside. The second rotating shaft 52 and the first rotating shaft 50 extend outward in the axial direction from the inside of the generator case 120 through corresponding shaft through holes formed in the wall portion of the generator case 120, respectively. The auxiliary bearing 124 is disposed between the second rotating shaft 52 and the first rotating shaft 50 and the corresponding through holes. In the present embodiment, a shaft through hole is formed in the inner peripheral surface of the cylindrical auxiliary bearing 124 sleeve protruding in the axial direction from the outer surface of the wall of the generator case 120, and the auxiliary bearing 124 is provided in the auxiliary bearing 124 sleeve. Is arranged.

  Also, as shown in FIGS. 4 and 5, a plurality of fins 125 for reinforcing and promoting heat dissipation are provided radially so as to connect the outer peripheral surface of the auxiliary bearing 124 sleeve and the outer surface of the wall of the generator case 120. ing. The set of fins 125 is provided on both the upper surface side and the lower surface side of the generator case 120.

  Next, as shown in FIG. 6, in the power generation apparatus 10, the first windmill 20 and the second windmill 30 each have a plurality of windmill blades 22 that receive wind in a direction orthogonal to the rotation axis M around the rotation axis M. It is configured as a Saponius type windmill. Moreover, the power generator 10 has the support frame 12 which supports the 1st windmill 20, the 2nd windmill 30, and the generator 40 so that the rotating shaft M may become vertical. The support frame 12 includes three columns 121 erected in the vertical direction on the table 14, and a plurality of beams 122 that connect the columns 121 to each other. The three columns 121 are arranged at the vertex positions of a substantially equilateral triangle when viewed from the vertical direction, and the beam 122 connects the columns 121 at three height positions including the upper end of the column 121. . The three beams 122 at each height position constitute a regular triangular frame.

  The first windmill 20 includes three windmill blades 22 and two blade support bodies 24. The second windmill 30 is configured in substantially the same manner as the first windmill 20 except that it has a three-dimensional shape that is a mirror image of the first windmill 20 with respect to the virtual vertical plane. The corresponding constituent elements of the first windmill 20 are made to share the number or letter of the first place or less, and the code of the tenth place number is changed from “2” to “3”. And, except for this point, the same reference numerals are given to members of the same type and different mounting positions in principle, but when distinguishing multiple members of the same type from each other, for convenience of explanation, as necessary, The code | symbol which added the alphabet (A, B, C) to the end of the code | symbol is used.

  Hereinafter, the main part of a windmill structure is demonstrated on the 1st windmill 20 side, and is demonstrated. First, as shown in FIG. 9 (plan view), the first wind turbine 20 and the second wind turbine 30 around the rotation axis M of each wind turbine blade 22 are opposite to each other in the reference rotation direction X (when receiving wind force). The actual rotation direction of each windmill 20, 30) is determined. In this reference rotational direction X, the blade surface located on the front side is the front blade surface 26, the blade surface located on the rear side is the rear blade surface 28, and the wind turbine blades 22 on the side close to the rotation axis M The edge is defined as the blade inner edge EL, and the edge on the far side is defined as the blade outer edge EH. Around the rotation axis M, the plurality of wind turbine blades 22 are supported by the blade support 24 so as to be integrally rotatable so that the blade inner edge EL is located at a certain distance in the radial direction from the rotation axis M. In the cross section orthogonal to the rotation axis M, each wind turbine blade 22 has a concave curved surface in which the rear blade surface 28 is retracted forward in the reference rotational direction X, and the front blade surface 26 projects forward in the reference rotational direction X. At the same time, a convex curved surface having a larger curvature depth than the rear blade surface 28 is formed.

  The front blade surface 26 has a maximum curvature at the curved nose portion 263, and the curvature decreases from the curved nose portion 263 toward the blade inner edge EL side and the blade outer edge EH side, respectively, and from the curved nose portion 263 to the blade outer edge EH. The surface length of the first surface reaching the same is a streamline shape larger than the surface length of the second surface reaching the blade inner edge EL. When the front blade surface 26 receives a relative airflow from the front side in the reference rotational direction X, the first surface and the second surface are generated along the first surface from the curved nose portion 263 toward the blade outer edge EH. It functions as a high-speed airflow passage surface 261 and a low-speed airflow passage surface 262, respectively, so that the relative airflow velocity becomes larger than the relative airflow velocity generated along the second surface toward the blade inner edge EL.

  As shown in FIG. 10, the lift torque based on the relative flow velocity difference between the high-speed airflow passage surface 261 and the low-speed airflow passage surface 262 causes the windmill blade 22 to rotate in the reference rotation direction X on the rear blade surface 28 side. It occurs in the direction. In other words, if the relative wind direction associated with the rotation is AK and the natural wind is AS, lift F acts on the wind turbine blade 22 and rotates around the rotation axis M in the reference rotation direction X. The wind turbine blades 22 have the same cross-section viewed from the vertical direction at any horizontal cross-section position. Both the front blade surface 26 and the rear blade surface 28 are formed of a blade plate made of an aluminum alloy plate (here, duralumin plate) processed into a curved shape, and have a hollow shape. As shown in FIG. 3, the upper end surface and the lower end surface of the wind turbine blade 22 are configured by a lid plate 27 and close the space R. The seam of the lid plate is stitched by, for example, riveting.

In addition, the windmill blade 22 can also be made into the sheet metal hollow body which sealed the filling gas whose gas specific gravity is smaller than air (gas specific gravity: 1, gas density: 1.2935 kg / Nm < ³ >). Also in this case, in the wind turbine blade 22, the front blade surface 26, the rear blade surface 28, and the lid plate 27 that forms the upper end surface and the lower end surface can be formed of an aluminum alloy plate, and helium gas or hydrogen gas is contained therein. Fill. In this case, the seam (seam portion) of the lid plate is filled with gas and then stitched to the entire circumference to form a sealed structure.

  The average curvature of the high-speed airflow passage surface 261 is set larger than the average curvature of the low-speed airflow passage surface 262, and the wind receiving cross-sectional area of the high-speed airflow passage surface 261 is larger than that of the low-speed airflow passage surface 262. Further, in a cross section orthogonal to the rotational axis M, a straight line connecting the rotational axis M and the blade inner edge EL is defined as a first straight line C1, and a second straight line C2 circumscribing the front blade surface 26 through the rotational axis M and the first straight line C1. Is set smaller than a second angle θ2 formed by the third straight line C3 passing through the rotation axis M and passing through the blade outer edge EH and the first straight line C1. By setting the mounting angle as described above, an airflow entering the first wind tunnel 20F, which will be described later, can be efficiently applied to the rear blade surface 28 of the windmill blade 22 arranged on the leeward side. Can be rotated.

  The high-speed airflow passage surface 261 is disposed on the side far from the rotation axis M, and is continuously formed from the curved nose portion 263 toward the rear side in the traveling direction. As shown in FIG. 4, the high-speed airflow passage surface 261 has a curved surface shape that swells larger in the direction away from the chord WG than the low-speed airflow passage surface 262 when considering the chord WG of the airfoil WI as shown in FIG. 4. Has been. Further, the length of the high-speed airflow passage surface 261 extends rearward in the traveling direction from the low-speed airflow passage surface 262. The rear end EH in the traveling direction of the high-speed airflow passage surface 261 is disposed at a position farthest from the rotation axis M in the wind turbine blade 22 and is disposed on the rear side in the traveling direction from the blade inner edge EL of the low-speed airflow passage surface 262. ing.

  Further, in the cross section orthogonal to the rotation axis M, each wind turbine blade 22 is set such that the average curvature of the rear blade surface 28 is smaller than the average curvature of the front blade surface 26, and the airflow that has passed through the low-speed airflow passage surface 262 It is difficult to form a vortex on the surface 28 side. Further, the wind turbine blade 22 is formed as a ridge line portion in which the blade inner edge EL and the blade outer edge EH form an intersection line between the curved front blade surface 26 and the rear blade surface 28, respectively.

  As shown in FIG. 9, the blade support 24 has an air outflow inlet between adjacent wind turbine blades 22 with respect to a cylindrical space including the blade inner edge EL of each wind turbine blade 22 arranged around the rotation axis M. The wind turbine blade 22 is configured to support the wind turbine blade 22 so as to be integrally rotatable so that the wind tunnel portion 20F is formed. A plurality of wind turbine blades 22 are arranged around the rotation axis M at equal angular intervals of three or more (here, three may be four), and a wind tunnel portion is formed from an air outflow entrance formed between the two wind turbine blades 22. A wind turbine blade 22 other than the two wind turbine blades 22 can be received by the rear blade surface 28 through 20F. Since the rear wing surface 28 has the concave curved shape as described above, the wind hitting the rear wing surface 28 is redirected so as to be wound in the direction of the rotation axis M, and the wind passing through the wind tunnel is The wind turbine blades 22 are effectively guided. In the present embodiment, the rear blade surface 28 is formed in a partial cylindrical surface shape having a constant curvature in a cross section orthogonal to the rotation axis M, and the rotation axis M is positioned on a virtual cylindrical surface including the rear blade surface 28. Yes.

  The blade support 24 is formed to support each wind turbine blade 22 on the end surface in the direction of the rotation axis M. Specifically, as shown in FIG. 11, a main body plate 241 that forms an end portion in the axial direction of the wind tunnel portion 20 </ b> F and a rotation support portion of the windmill, and radially outward from the outer peripheral edge of the main body plate 241. Support arm plates 242 that extend radially and are each attached to the end face of the wind turbine blade 22. The support arm plate 242 is attached to the end face of the wind turbine blade 22 along the blade inner edge EL. A plurality of attachment holes 243 (four in this embodiment) are formed along the arc shape at the front edge of the support arm plate 242. The front edge and the rear edge of the lid plate 27 of the wind turbine blade 22 are overlapped, and screws (not shown) are inserted into the mounting holes 243 and fixed to the lid plate 27, so that the wind turbine blade 22 is supported by the support arm plate 242. Is attached. The three wind turbine blades 22A, 22B, and 22C are similarly attached to the other support arm plate 242, and the blade support members 24A and 24B are disposed on the upper and lower surfaces of the wind turbine blade 22, respectively.

  Next, as shown in FIG. 8, a first wind tunnel 20 </ b> F that is a hollow portion in which the rotation shaft is not arranged is formed in an intermediate portion surrounded by the wind turbine blades 22 between the blade supports 24 </ b> A and 24 </ b> B. Yes. As shown in FIG. 7, an auxiliary first rotating shaft 51 arranged along the rotation axis M is fixed to the upper side of the center portion of the blade support 24A, and the rotation axis line is positioned below the center portion of the blade support 24B. A first rotating shaft 50 arranged along M is fixed.

  A plurality of attachment holes 243 (four in this embodiment) are formed along the arc shape at the front edge of the support arm plate 242. The front edge and the rear edge of the lid plate 27 of the wind turbine blade 22 are overlapped, and screws (not shown) are inserted into the mounting holes 243 and fixed to the lid plate 27, so that the wind turbine blade 22 is attached to the support arm plate 242. It is attached. The three wind turbine blades 22A, 22B, and 22C are similarly attached to the other support arm plate 242, and the blade support members 24A and 24B are disposed on the upper and lower surfaces of the wind turbine blade 22, respectively.

  As illustrated in FIG. 8, the first wind tunnel 20 </ b> F, which is a hollow portion, is formed in an intermediate portion between the blade supports 24 </ b> A and 24 </ b> B and surrounded by the wind turbine blade 22. As shown in FIG. 7, an auxiliary first rotating shaft 51 arranged along the rotation axis M is fixed to the upper side of the center portion of the blade support 24A, and the rotation axis line is positioned below the center portion of the blade support 24B. A first rotating shaft 50 arranged along M is fixed.

  As shown in FIG. 8, the second windmill 30 includes three windmill blades 32A, 32B, and 32C and two blade support bodies 34A and 34B. The blade supports 34A and 34B have the same shape as the blade supports 24A and 24B of the first windmill 20. The wind turbine blades 32A, 32B, and 32C have substantially the same shape as the wind turbine blades 22A, 22B, and 22C of the first wind turbine 20, and include a blade plate that forms a front blade surface 36 and a rear blade surface 38, and a lid plate 37. I have. In the present embodiment, the wind turbine blade 32 is different from the wind turbine blade 22 only in the vertical direction, and the vertical length of the wind turbine blade 32 is longer than the length of the wind turbine blade 22 in the same direction. The wind turbine blade 32 is attached to the blade support 34 in the same manner as the first wind turbine 20, and a space surrounded by the wind turbine blade 32 between the blade supports 34A and 34B is a second wind tunnel 30F.

  As shown in FIG. 7, a second rotation shaft 52 arranged along the rotation axis M is fixed to the upper side of the central part of the blade support 34A, and the rotation axis M is fixed to the lower side of the central part of the blade support 34B. The auxiliary second rotating shaft 53 arranged along the axis is fixed. As described above, the second windmill 30 is obtained by reversing the mirror image of the first windmill 20 with respect to the plane including the rotation axis (excluding the height direction dimension) so as to rotate in the opposite direction to the first windmill 20. It is comprised so that it may correspond to.

  As shown in FIG. 8, the first windmill 20, the generator 40, and the second windmill 30 are disposed in the support frame 12 in this order from the upper side. As shown in FIG. 6, the shaft support portion 16 is provided at the center portion of the beam 122 arranged at the upper end portion of the support frame 12. The shaft support portion 16 is connected to and supported by three beams 13 extending from the upper end portion of each column 121 toward the inner side in the horizontal direction. A bearing 511 is provided below the shaft support 16 (see FIG. 2). The bearing 511 supports the upper end portion of the auxiliary first rotating shaft 51. A table 18 is fixed on the beam 17 that is arranged at the same height as the beam 122 arranged at the bottom and extends in the horizontal direction from each column 121 inward. A bearing 531 is provided on the table 18. The bearing 531 supports the lower end portion of the auxiliary second rotary shaft 53.

Next, the effect | action of the electric power generating apparatus 10 of this embodiment is demonstrated.
12-14 is a figure which shows an airflow when each windmill blade 22 of the 1st windmill 20 rotates and is arrange | positioned with respect to the wind of the arrow WIND direction at a different position. Arrow A indicates airflow.
First, FIG. 12 left shows the viewing width of the wind tunnel portion 20F on the projection plane K parallel to the rotation axis M and perpendicular to the wind direction WIND when viewed from the windward direction (direction perpendicular to the rotation axis M). It is a figure which shows a torque generation relationship when a windmill rotation phase is defined so that the dimension (viewed in 1) may become the maximum (henceforth a 1st phase). In the wind turbine blade 22A, the rear blade surface 28A is substantially shielded by the high-speed airflow passage surface 26A of the front blade surface 26. Therefore, most of the airflow is removed from the outer edge of the blade except for the airflow that wraps around the rear blade surface 28A. It strikes the surface 28A side (A), and a force in the direction of arrow AA including a component in the reference rotation direction acts.

  On the other hand, the airflow that circulates from the blade outer edge toward the rear blade surface 28A passes through the first wind tunnel 20F and hits the rear blade surface 28B of the wind turbine blade 22B. In the windmill blade 22B, the airflow A that has flowed after hitting the windmill blade 22A and the airflow A that has flowed in between the windmill blade 22A and the windmill blade 22C and passed through the first wind tunnel 20F are hit. The former airflow A hits the rear blade surface 28B, and the latter airflow A hits the low-speed airflow passage surface 262 of the rear blade surface 28B and the front blade surface 26B. The contributions of both of these to the rotational torque are opposite to each other. However, in the positional relationship on the left in FIG. 12, the rear blade surface 28B has a larger wind receiving cross-sectional area than the low-speed airflow passage surface 262. A force indicated by an arrow AB including a component in the reference rotation direction acts on 22B.

  Further, in the wind turbine blade 22C, the airflow A strikes the front blade surface 26C side, and the wind is opposed to the rotation direction. The force directly acting on the front blade surface 26C due to the head wind acts to prevent the windmill from rotating in the reference rotation direction. On the other hand, the low-speed airflow passage surface 262 side and the high-speed airflow passage surface 261 side of the windmill blade 22C As described above, the airflow that has flown rearward in the rear direction generates lift on the rear blade surface 28C side due to the speed difference between the airflow flowing on the low-speed airflow passage surface 262 side and the airflow flowing on the high-speed airflow passage surface 261 side. Since the torque due to the lift is generated in the reference rotational direction, the reaction torque due to the head wind acting on the front blade surface 26C is at least partially offset. The blade cross-sectional shape employed in the present embodiment is the shape of FIG. 10, and the wind turbine is designed so that the lift torque when receiving the airflow in the direction of the vertex normal of the curved nose overcomes the reaction torque caused by the head wind. Even in the blade 22C, a force in the direction of the arrow AC including a component in the traveling direction is applied although it is small. As a result, as shown on the right side of FIG. 12, the forces in the directions of the arrows BA (corresponding to the right AA), BB (corresponding to the right AB), and BC (corresponding to the right AC) are all in the reference rotation direction X. As a result, the wind turbine blades 22 rotate in the arrow X direction.

  The size of the wind tunnel portion 20F is such that, in the first phase, the visual width W of the wind tunnel portion 20F on the projection plane K is 30% of the projection width U of the wind turbine blade 22B located on the leeward side of the wind tunnel portion 20F. It is desirable that it is less than 100%. If it is 30% or more, the wind receiving efficiency of the wind turbine blade 22B located on the leeward side through the wind tunnel portion 20F deteriorates, and if it exceeds 100%, the airflow passing through the wind tunnel portion 20F without hitting the wind turbine blade 22B increases. However, the wind receiving efficiency is similarly deteriorated.

  Subsequently, FIG. 13 left shows a projection plane in which the wind turbine blade 22B is not visually recognized on the leeward side of the wind tunnel portion 20F when viewed from the windward direction, and is parallel to the rotation axis M and orthogonal to the wind direction WIND. It is a figure which shows a torque generation relationship when a windmill rotation phase is defined so that the visual recognition width W of the wind tunnel part 20F on K may become the maximum (henceforth a 2nd phase). The wind turbine blade 22A is subjected to CA in a relatively large reference rotational direction X afterward mainly by wind force received by the rear blade surface 28A. Further, the wind turbine blade 22C receives the contribution of lift in the same manner as the wind turbine blade 22C in the left of FIG. 12, and a force in the direction of the arrow CC acts. Since the wind turbine blade 22B is in a positional relationship blocked by the wind turbine blade 22C on the windward side, the airflow that has passed through the wind tunnel portion 20F passes through the wind turbine blade 22B without hitting it. However, due to the airflow that flows along the rear wing surface 28A that is concavely curved in the centripetal direction of the windmill blade 22A that is located on the front side in the reference rotation direction X, the airflow that passes through the wind tunnel portion 20F is also the rear wing surface of the windmill blade 22C. The force in the direction of the arrow CB including the component in the reference rotation direction X acts even though the wind turbine blade 22B is bent. As a result, as shown in the right of FIG. 13, the forces in the directions of the arrows DA (corresponding to the right CA), DB (corresponding to the right CB), and DC (corresponding to the right CC) are all in the reference rotational direction X. As a result of contributing to the generation, the wind turbine blade 22 rotates in the arrow X direction.

  Finally, FIG. 14 left shows a projection plane K parallel to the rotation axis M and perpendicular to the wind direction WIND of the wind turbine blade 22C visually recognized on the windward side of the wind tunnel portion 20F when the wind tunnel portion 20F is viewed from the windward direction. It is a figure which shows a torque generation relationship when a windmill rotation phase is defined so that the visual recognition width in may become the maximum (henceforth a 3rd phase). On the wind turbine blade 22A, the airflow A hits the rear blade surface 28A, and a force in the direction of the arrow EA that substantially matches the wind direction acts. In the wind turbine blade 22B, the airflow A hits the front blade surface 26B side, and the wind is against the traveling direction. Due to this head wind, lift acts on the wind turbine blade 22C, and a force in the direction of the arrow EB acts forward in the reference rotation direction. In the wind turbine blade 22C, the airflow A hits the front blade surface 26C and flows toward the front side in the reference rotation direction. As a result, as shown in the right of FIG. 14, the forces in the directions of arrows FA (corresponding to the right EA), FB (corresponding to the right EB), and FC (corresponding to the right EC) are all torques in the reference rotational direction X. As a result of contributing to the generation, the wind turbine blade 22 rotates in the arrow X direction.

  Thus, it can be seen that for each of the main rotational phases of the first wind turbine 20 with respect to the wind direction, the combined torque of the rotational torque generated in each wind turbine blade is generated in the direction of the reference rotational direction X. As a result, the first wind turbine 20 always rotates in the reference rotation direction X regardless of the direction of wind around the rotation axis. As for the second windmill 30, the above situation is exactly the same except that the reference rotation direction is reversed (Y) as shown in FIG.

  As a result, the first rotor 41 and the second rotor 42 of the generator 40 in FIG. 1 rotate in opposite directions corresponding to the wind speed, and the relative rotational speed between the rotors is double that of the case where one of them is fixed. And the power generation efficiency is improved. Further, as described above, in the generator 40, the field magnet 101 and the power generation coil 102 face each other in the axial direction, so that the first rotor 41 provided with the field magnet 101 and the power generation coil 102 are provided. With the two rotors 42, the weights of the field magnet 101 and the power generating coil 102 are concentrated at substantially the same radial position, and a difference in the moment of inertia around the rotation axis M is less likely to occur. As a result, the rotational inertial forces of the upper and lower wind turbines are less likely to be unbalanced, and the power generation characteristics during low-speed rotation are likely to be stable. In addition, the effect of canceling the rotational torsional load on the rotating shaft can be greatly enhanced, and this has an advantageous effect on the structural strength. Furthermore, since both the power generating coil 102 and the field magnet 101 can be made thin and the power generating coil 102 is an air-core type, it greatly contributes to the weight reduction of the entire power generating device 10. Since the loads on the power generating coil 102 and the field magnet 101 are relatively concentrated in the axial direction, the flywheel effect is greatly enhanced. As a result, it is possible to effectively suppress the rotational shaft shake during strong winds and the like. Since the field repulsive force between the coil and the magnet is generated in the axial direction, it is difficult to cause rotational shaft shake and cogging. Furthermore, since the power generation coil 102 is an air-core type, eddy current loss is small and power generation efficiency is good. Moreover, the heat generation of the generator 40 is also suppressed.

  Next, FIG. 15 shows the center of gravity G and the rotation axis of the wind turbine blade 22 when the wind turbine blade 22 is disposed at a position where it is considered that the wind turbine blade 22 receives the force most opposite to the rotation direction with respect to the wind in the arrow WIND direction. It is a figure which shows the relationship with M. As shown on the left side of FIG. 15, when a virtual straight line L from the rear end portion of the high-speed airflow passage surface 261 to the farthest position of the low-speed airflow passage surface 262 is considered, the virtual straight line L is a position where the virtual straight line L is orthogonal to the arrow WIND direction. When the wind turbine blades 22 are arranged at the position (position where the area directly exposed to the airflow A is considered to be the largest), the center of gravity G is arranged at a position close to the rotation axis M as viewed from the arrow WIND direction. Therefore, compared with the case where the center of gravity G is arranged at a position far from the rotation axis M, the force component in the direction opposite to the traveling direction is reduced even when the wind of the same force in the arrow WIND direction hits the wind turbine blade 22. can do.

  Further, as shown in the right of FIG. 15, at the position of the wind turbine blade 22 when the airflow strikes the high-speed airflow passage surface 261 in a direction substantially orthogonal thereto (position where the drag due to the airflow A is considered to be large), the arrow WIND When viewed from the direction, the center of gravity G is disposed at a position that substantially overlaps the rotation axis M. Therefore, even when a force in the direction of the arrow WIND (indicated by the arrow D) acts on the wind turbine blade 22, the component of the force in the direction opposite to the traveling direction can be reduced.

The longitudinal cross-sectional view which shows an example of the generator which makes the principal part of the electric power generating apparatus of this invention. The figure which shows the example of arrangement | positioning of the field magnet in the 1st rotor of FIG. The figure which shows the example of arrangement | positioning of the coil for electric power generation in the 2nd rotor of FIG. The front view of the generator of FIG. FIG. The perspective view which shows the example which comprised the electric power generating apparatus of this invention as a wind power generator. The front view of FIG. The disassembled perspective view of the principal part of FIG. The cross-sectional view of a 1st windmill. Action | operation explanatory drawing of a windmill blade. The top view which shows an example of the attachment aspect of a wing | blade support body. 1st action explanatory drawing of a windmill. Explanatory drawing of the 2nd effect | action of a windmill. Explanatory drawing of the third action of the windmill. Explanatory drawing of the 4th effect | action of a windmill. Explanatory drawing of the reference | standard rotation direction of a 2nd windmill.

Explanation of symbols

10 Wind power generator (power generator)
20 First windmill (first rotation input part)
30 Second windmill (second rotation input part)
20F, 30F Wind tunnel portion 22 Wind turbine blade 261 High-speed airflow passage surface 262 Low-speed airflow passage surface 263 Curved nose portion 26 Front blade surface (first windmill)
28 Rear wing surface (first windmill)
32 Windmill Wings (Second Windmill)
36 Front wing surface (second windmill)
38 Rear wing surface (second windmill)
40 generator 41 first rotor 42 second rotor 101 field magnet 102 power generation coil

Claims (10)

A first rotation input unit that is arranged in a form that coincides with the rotation axis at a first position on the reference axis, and that rotates in a first direction in response to a fluid flow serving as a power generation drive source;
A second rotation input that is disposed at a second position different from the first position on the reference axis and that rotates in a direction opposite to the first rotation input section when receiving the flow of the fluid from the same direction. And
A first rotor provided with a field magnet, and a second rotor provided with a power generating coil that rotates integrally with the second rotation input portion in the opposite direction to the first rotor and is excited by the field magnet. A generator having a rotor,
The generator includes a plurality of the power generators configured in an air-core flat shape in the second rotor such that the power generation coil and the field magnet face each other in a form forming an air gap in the rotation axis direction. Coils are arranged around the rotation axis such that the axis direction coincides with the rotation axis direction, and in the first rotor, a plurality of field magnets are arranged around the rotation axis in the rotation axis direction. A power generator configured as an axial gap generator arranged in a magnetized form.   A slip ring connected to each of the plurality of power generating coils is provided on a second rotation shaft that couples the second rotor and the second rotation input unit, and on the slip rotation on the second rotation shaft. The power generation device according to claim 1, wherein a power generation output from the power generation coil is taken out through a sliding brush.   The first rotor has a disk-shaped rotor body to which the field magnet is attached to a surface of the second rotor facing the power generating coil, and is separated from the second rotating shaft. The power generator according to claim 1 or 2, wherein the rotary shaft is coupled to the rotor body so as to be integrally rotatable.   The first rotor is provided with a disk-shaped auxiliary rotor body facing the power generation coil of the second rotor in an axial direction from the opposite side of the rotor body, and the auxiliary rotor body An auxiliary field magnet having a polarity opposite to that of the field magnet is attached to a position corresponding to the field magnet on the rotor body side on the surface facing the power generation coil, and the rotor body and the auxiliary rotor The main body is connected to the outer peripheral edge by a peripheral wall portion surrounding the second rotor in the circumferential direction so as to be integrally rotatable, and the rotor main body, the peripheral wall portion, and the auxiliary rotor main body constitute a field yoke made of a soft magnetic metal material. The power generator according to any one of claims 1 to 3. A cylindrical first bearing sleeve is formed to protrude from the main surface of the rotor body opposite to the second rotor so as to surround the rotation axis, and is separated from the second rotation shaft. The first rotary shaft is coupled to a shaft coupling shield that closes the tip of the first bearing sleeve so as to be integrally rotatable,
A cylindrical second bearing sleeve protrudes from the main surface opposite to the second rotor of the auxiliary rotor body,
The second rotation shaft penetrates the second bearing sleeve and the second rotor from the second rotation input portion side, and a tip portion enters the first bearing sleeve, and is on both sides of the second rotor in the axial direction. A main bearing that supports the first rotor with respect to the second rotor between the first bearing sleeve and the second bearing sleeve and the second rotating shaft in a manner allowing relative rotational sliding of both of them. The power generation device according to claim 4, wherein   A non-rotating generator case is provided so as to cover the first rotor from the outside, and the second rotating shaft and the first rotating shaft are formed on the wall of the generator case from the inside of the generator case, respectively. The auxiliary bearing is disposed between the second rotating shaft and the first rotating shaft and the corresponding through holes while extending outward in the axial direction at the corresponding shaft through holes formed. The power generator described.   An inner peripheral surface of a cylindrical auxiliary bearing sleeve protruding in the axial direction from the outer surface of the wall of the generator case serves as the shaft through hole, and the auxiliary bearing is disposed in the auxiliary bearing sleeve. The power generator according to claim 6, wherein a plurality of fins for reinforcement and heat dissipation are provided radially so as to connect the outer peripheral surface of the bearing sleeve and the outer surface of the wall of the generator case.   The first rotation input unit and the second rotation input unit are Saponius type wind turbines in which a plurality of wind turbine blades that receive wind in directions orthogonal to the rotation axis are arranged around the rotation axis, respectively, in the same direction The power generator according to any one of claims 1 to 7, wherein the power generator is configured as a first wind turbine and a second wind turbine that rotate in opposite directions by receiving wind.   The power generator according to claim 8, further comprising a support frame that supports the first windmill, the second windmill, and the generator so that the rotation axis is vertical. The first windmill and the second windmill are respectively
A blade surface located on the front side is defined as a front blade surface in a reference rotation direction that is determined around the rotation axis of each of the wind turbine blades and opposite to each other in the first wind turbine and the second wind turbine. When the blade surface located on the side is defined as the rear blade surface, the edge on the side close to the rotational axis of each wind turbine blade is defined as the blade inner edge, and the edge on the far side is defined as the blade outer edge,
Around the rotation axis, the plurality of wind turbine blades are supported so as to be integrally rotatable by a blade support so that the blade inner edge is located at a certain distance in the radial direction from the rotation axis,
Further, in the cross section orthogonal to the rotation axis, each wind turbine blade has a concave curved surface in which the rear blade surface is retracted forward in the reference rotation direction, and the front blade surface protrudes forward in the reference rotation direction. In addition, the front wing surface has a maximum curvature at the curved nose portion, and is curved from the curved nose portion to the blade inner edge side and the blade outer edge side. Each of the curvatures decreases toward the surface, and the surface length of the first surface from the curved nose portion to the blade outer edge is also larger than the surface length of the second surface to the blade inner edge,
When receiving a relative airflow from the front side in the reference rotation direction on the front blade surface, the first surface and the second surface are along the first surface from the curved nose portion toward the outer edge of the blade. In addition, each of the high-speed airflow passage surface and the low-speed airflow passage surface functions so that the velocity of the relative airflow generated is larger than the velocity of the relative airflow generated along the second surface toward the blade inner edge. A Saponius type windmill in which lift torque based on the flow velocity difference of the relative airflow between the airflow passage surface and the low-speed airflow passage surface is generated in the direction in which the windmill blade is rotated in the reference rotation direction on the rear blade surface side. The power generator according to claim 8.

Images