JP6736736B1 - Wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind power generation device capable of obtaining stable electromotive force even if the wind direction or the wind speed changes rapidly. A wind power generation device (20) includes a power generation unit (23) having a vertical rotation shaft (21) and three Savonius-type generators (10) having a propeller (12) at the tip of a horizontal rotation shaft (11), and a plurality of Savonius-type generators. Each of the generators 10 has a configuration in which the vertical rotating shaft 21 is radially connected in the horizontal direction. When the Savonius type generator 10 receives wind and the propeller 12 and the rotor 14 rotate, a gyro moment T generated in a direction orthogonal to the rotation axis thereof is generated, whereby three Savonius type generators centering on the vertical rotation axis 21 are generated. 10 rotates and the generator 22 generates electricity. [Selection diagram]

Description

The present invention relates to a wind turbine generator.

Wind power generation is a device that uses clean and inexhaustible natural energy to obtain power generation energy, and accounts for the largest amount of power generation in the world's renewable energy. Japan, which relies on importing most of its energy from abroad, is expected to grow most from the perspective of energy security and prevention of global warming. Currently, in large-scale onshore and offshore wind farms, propeller-type power generators with high aerodynamic conversion efficiency (for example, 30 to 40%) are the mainstream (see FIG. 1a).
On the other hand, in order to meet the local power demand of general households and offices, vertical axis type small power generators that are not affected by the wind direction are also popular. Typical vertical axis power generators include, for example, the Darrieus type (see FIG. 1b) and the Savonis type (see FIG. 1c). These are suitable for installation in urban areas and their suburbs because they have relatively low low-frequency noise and are easily miniaturized. For example, a wind turbine generator having a simple structure for general households, which is a combination of the Darrieus type and the Savonius type, has already been proposed (see, for example, Patent Document 1).

JP, 11-294313, A

The propeller-type wind turbine generator is excellent in conversion efficiency as described above. However, there is a demerit that the output becomes unstable due to changes in wind force and wind direction. In addition, the Darrieus-type power generation device has a poor self-starting property as compared with the propeller-type generator. Further, the Savonius type power generation device has a good self-starting property, but has a low output because a large rotation speed cannot be obtained.
The present invention has been made in view of such conventional problems, and an object thereof is to provide a wind turbine generator capable of obtaining stable electromotive force even when the wind direction or the wind speed changes rapidly.

In order to solve the above-mentioned problems, the present invention converts a horizontal rotating shaft, a propeller provided at a tip end portion of the horizontal rotating shaft, and a rotational force of the horizontal rotating shaft generated by the propeller receiving wind into electric power. And a rotational force assisting device for assisting the rotational force of the horizontal rotary shaft.

In this wind power generator, it is preferable that the rotation assisting device is a Savonius rotor having rotary blades that generate a rotational force on the horizontal rotary shaft in the same direction as the rotation by the propeller when receiving wind.

Further, the present invention provides a plurality of Savonius-type generators having a horizontal rotation shaft and a propeller provided at the tip of the horizontal rotation shaft, one vertical rotation shaft, and the rotational force of the vertical rotation shaft used as electric power. A wind power generator comprising a generator for conversion, each of the plurality of Savonius type generators being connected radially in a horizontal direction about the vertical rotation axis, and being orthogonal to the rotation axis of the propeller. A wind power generator configured such that a gyro moment generated in a direction acts on the vertical rotation axis to generate power by the generator.

In this wind power generator, it is preferable that a Darrieus-type blade is further provided on the vertical rotation axis.

According to the wind turbine generator of the present invention, stable electromotive force can be obtained even when the wind direction or the wind speed changes rapidly.

It is a figure which illustrates the conventional wind power generator. FIG. 3 is an external view of a Savonius generator according to the first embodiment. It is an external view of a wind turbine generator according to a second embodiment. It is a figure which shows the electric power generation unit which comprises the wind power generator of FIG. It is an external view when the wind power generator of FIG. 3 is seen from directly above. It is a model figure for demonstrating the principle of a gyro effect.

(First embodiment)
FIG. 2 is an external view of a Savonius generator 10 that is a first embodiment of a wind turbine generator according to the present invention. The Savonius generator 10 according to the present embodiment includes a horizontal rotary shaft 11, propellers 12a, 12b, and 12c provided at the tip of the horizontal rotary shaft 11, and a generator 13 that converts the rotational force of the horizontal rotary shaft 11 into electric power. And a Savonius type rotor 14 as a rotational force assisting device for assisting the rotational force of the horizontal rotary shaft 11.

The Savonius type rotor 14 is connected to the horizontal rotating shaft 11 and has a rotary blade 15 having a semi-cylindrical shape or a wind receiving surface curved in an S-shape in cross section. The Savonius-type rotor blade 15 has a concave wind direction so that the horizontal rotation shaft 11 rotates in the same direction as the rotation of the propellers 12a, 12b, and 12c (clockwise direction in FIG. 2). It is set. That is, when the Savonius rotor 14 receives wind on the wind receiving surface of the rotary blade 15, the wind force pushes the rotary blade 15 to transmit the rotational force to the horizontal rotary shaft 11.

According to the Savonius generator 1 of the first embodiment, even if the direction of the wind received by the propellers 12a, 12b, 12c suddenly changes, the Savonius rotor 14 having a high startability receives the wind from the side. As a result, the rotational force of the horizontal rotary shaft 11 is compensated, so that fluctuations in the amount of power generation can be suppressed. Further, since the Savonius rotor 14 is provided as a rotational force assisting device for assisting the rotational force of the horizontal rotary shaft 11, the self-starting performance can be improved.

(Second embodiment)
FIG. 3 is an external view showing a second embodiment of the wind turbine generator according to the present invention. The wind turbine generator 20 according to the present embodiment includes one vertical rotation shaft 21, a generator 22 that converts the rotational force of the vertical rotation shaft 21 into electric power, and a plurality of Savonius generators 10 connected to the vertical rotation shaft 21. ing. The Savonius generator 10 may be the same as that used in the first embodiment.

The configuration of the wind turbine generator 20 according to the second embodiment will be described in more detail. The wind turbine generator 20 is basically composed of a combination of a vertical axis power generation unit 23 shown in FIG. 4 and, for example, three horizontal axis power generation units 24. The vertical axis power generation unit 23 includes the vertical rotation shaft 21 and the generator 22 described above as components. The horizontal axis power generation unit 24 includes the horizontal rotary shaft 11 and the generator 13 that configure the Savonius generator 10 described above.

A base end of each horizontal axis power generation unit 24 is connected to a hub 25 fixed to the vertical rotation shaft 21. When the wind turbine generator 20 is viewed from directly above the vertical rotation shaft 21, three Savonius-type generators 10 are connected to the vertical rotation shaft 21 at an angle of 120° with each other, as shown in FIG. There is. As a result, the three Savonius generators 10 can be rotated together with the vertical rotation shaft 21 on the horizontal plane.

As described above, the Savonius generator 10 is provided with, for example, the three-blade propeller 12 at the tip of the horizontal rotary shaft 11. Such a propeller in which two or more airfoils extend from the center can be regarded as a kind of boomerang. The boomerang has the property of returning to its original position on a flight route that makes an oblique arc from the thrown position. The principle is known to be due to a gyroscopic precession in which a moment is generated in a direction orthogonal to the rotation of the blade.

The gyro effect is explained using a simple model. As shown in FIG. 6, when the gravitational moment Ng is applied to the inertial body I (angular velocity vector L=I×ω) rotating at the angular velocity ω around the X axis, the inertial body I will be rotated around the Z axis. A gyro moment Nz (torque T in the Y-axis direction) is generated. Since the inertial body I rotates around the center of gravity, the angular velocity vector L becomes a spin angular momentum.

In the wind turbine generator 20 of the present embodiment, since the Savonius generator 10 is cantilevered and connected to the vertical rotation shaft 21, the propeller 12 and the Savonius rotor 14 receive wind and rotate clockwise (CW). Due to the rotation, a torque T based on the gyro moment is generated on the vertical rotation shaft 21. When the propeller 12 is a wing type, an upward moment is generated due to a lift force against gravity, and therefore the vertical rotation shaft 21 rotates counterclockwise (CCW). Then, as the vertical rotation shaft 21 rotates, the generator 22 of the vertical axis power generation unit 23 generates power. Although not shown, in the case where the propeller 12 and the Savonius rotor 14 are simple rotary inertia bodies that receive a moment of gravity (in short, no lift is generated), the vertical rotation shaft 21 is rotated clockwise (CW). The gyro moment may be generated, and the generator 22 may generate electric power by utilizing the rotation.

Further, the electric power generated by the generator 13 of the Savonius generator 10 (horizontal axis power generation unit 24) is recovered via the slip ring 26 attached to the vertical rotation shaft 21.

According to the wind turbine generator 20 of the second embodiment, since the vertical axis power generation unit 23 generates electric power by the torque of the gyro moment generated by the rotational inertia of the propeller 12 and the Savonius rotor 14, the wind direction and the wind speed rapidly. Even if it fluctuates, it is unlikely to be affected by electromotive force, and stable power can be obtained. Further, a high output can be obtained by adding electric power from the Savonius generator 10. Further, by arranging the Savonius type generator 10 in a horizontal radial pattern, efficient power generation can be stably performed without depending on the wind direction.

By adding a Darrieus-type blade (airfoil) to the vertical rotation shaft 21, an omnidirectional wind power generator with higher output can be obtained.

10 Savonius generator (first embodiment)
11 Horizontal Rotating Shaft 12 Propeller 13 Generator 14 Savonius Rotor 15 Rotor Blade 20 Wind Power Generator (Second Embodiment)
21 vertical rotation shaft 22 generator 23 vertical axis power generation unit 24 horizontal axis power generation unit 25 hub 26 slip ring

Claims (2)

A plurality of Savonius type generators having a horizontal rotation shaft and a propeller provided at the tip of the horizontal rotation shaft;
One vertical axis of rotation,
A wind power generator comprising: a generator that converts the rotational force of the vertical rotation axis into electric power,
Each of the plurality of Savonius-type generators are connected radially in the horizontal direction about the vertical rotation axis,
A wind turbine generator configured such that a gyro moment generated in a direction orthogonal to a rotation axis of the propeller acts on the vertical rotation axis to cause the generator to generate power. The wind turbine generator according to claim 1, wherein a Darrieus-type blade is further provided on the vertical rotation shaft.

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