JP2020022279A - Natural force power generator - Google Patents

Abstract

To provide a natural force power generator in the power transmission means of which wear, etc. does not occur while using a power generator of a phase rotation system with high power generation efficiency.SOLUTION: In a natural force power generator 10 with: a propeller 11 which rotates when hydraulic power or wind power is received; a power generator 12 in which power generation magnet Mand a power generation coil Crelatively rotate to cause the power generation coil Cto generate AC current when the propeller 11 rotates; and power transmission means 13 for transmitting the power generated by the power generator 12 to the outside, a power generator of a phase rotation system is used as the power generator 12 and a power transmitter of a non-contact system is used as the power transmission means 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a natural power generator that generates power from hydraulic power or wind power and transmits the generated power to the outside.

  Various types of natural power generators that generate power from hydropower or wind power and transmit the power to the outside have been proposed so far. As shown in FIG. 5 of Patent Document 1, a propeller and a generator are used. Those that have are common. In this type of natural power generator, the propeller rotates when it receives hydraulic power or wind power from its front, and the generator converts the rotational power of the propeller into electric power.

  That is, the generator includes a rotor connected to the rear end of the shaft of the propeller and rotating with the propeller, and a stator covering the outer peripheral portion of the rotor. The stator is fixed to a base portion or the like of the generator, and does not rotate even when the propeller rotates. A plurality of permanent magnets (power generation magnets) are fixed to the outer periphery of the rotor, and a plurality of coils (power generation coils) are fixed to the inner periphery of the stator. Therefore, when the propeller rotates, the power generating magnet and the power generating coil in the power generator relatively rotate, and the magnetic field from the power generating magnet passing through the power generating coil changes. At this time, an induced current is generated in the power generation coil due to the change in the magnetic field.

JP 2015-050914 A

  However, as described above, since a generator including a rotor and a stator (hereinafter, this type of generator has a structure in which only a power generation magnet rotates (a structure in which a power generation coil does not rotate), ), Which has a drawback that the power generation efficiency cannot be so high. As for natural power generators, there is an increasing demand for small hydropower generators that generate power by rotating propellers in the water flow of small waterways. Due to the low power generation efficiency, it was difficult to extract stable power. Even if a single-rotor type generator is adopted as a small hydro power generator, it is possible to extract a certain amount of stable power by increasing the dimensions of the propeller, but in this case, the dimensions of the rotor and stator are also increased. Therefore, there arises a problem that the size of the whole apparatus is increased even though it is a small hydroelectric power generation apparatus.

  By the way, as a method of increasing the power generation efficiency of the generator, there is a method of increasing the relative rotation speed between the power generation magnet and the power generation coil. In this regard, the above-mentioned propeller is provided with a first propeller which rotates to one side when receiving hydraulic power or the like on its front face, and a second propeller which is arranged concentrically with the first propeller and receives hydraulic power or the like on its front face (with the first propeller). The generator is constituted by a second propeller that rotates in the opposite direction, and the generator is arranged so as to surround the outer periphery of the first rotor with the first rotor that rotates with the first propeller and rotates with the second propeller. When the power generating magnet is fixed to one of the outer peripheral portion of the first rotor or the inner peripheral portion of the second rotor and the power generating coil is fixed to the other, the power generation is performed. Relative rotation speed between the magnet for power generation and the coil for power generation can be increased.

  That is, while a single-rotation type generator has a structure in which a generating magnet rotates with respect to a stationary generating coil, a generator having a first rotor and a second rotor has Since both the coil and the generator magnet rotate in opposite directions, the relative rotation speed between the generator magnet and the generator coil is increased to increase the power generation efficiency of the generator compared to a single-turn type generator. It is possible. Hereinafter, this type of generator (a generator having a structure in which both a generating coil and a generating magnet rotate in opposite directions) may be referred to as a “phase rotation type generator”.

  However, in a phase rotation type generator, not only the power generating magnet but also the power generating coil that generates the induced current rotates, so it is not always easy to take out the current flowing through the power generating coil to an external stationary system. Did not. In this regard, as a mechanism for extracting electric power from the rotating system to the stationary system, there is a mechanism in which an electrode called a “brush” is always brought into contact with the outer peripheral portion of the rotating conductor shaft. However, the mechanism using this brush has a structure in which the brush is always in contact with the rotating conductor shaft, so that the brush is easily worn. In particular, natural power generators such as the above-mentioned small hydro power generators are usually rotated 24 hours a day, 7 days a week. However, the brush described above is used to extract power from the generator of such a natural power generator. With the use of, there is a problem that the brush needs to be frequently replaced, and maintenance becomes difficult.

  Means for Solving the Problems The present invention has been made to solve the above-described problem, and means for transmitting power generated by a generator to the outside while using a phase rotation type generator having high power generation efficiency ( The present invention is to provide a natural power generator which is easy to maintain without causing wear or the like on the power transmission means).

The above issues are
A propeller that rotates when it receives hydraulic or wind power,
When the propeller rotates, the generator magnet and the generator coil rotate relatively to generate an alternating current in the generator coil, and
A natural power generator having power transmission means for transmitting the power generated by the generator to the outside,
As a generator, use a phase rotation type generator,
The problem can be solved by providing a natural power generator characterized by using a non-contact power transmission device as the power transmission means.

The natural power generator of the present invention employs a phase rotation type generator as a generator. In particular,
Propeller,
A first propeller that rotates to one side when receiving hydraulic or wind power on its front,
Constructed with a second propeller that is arranged concentrically with the first propeller and rotates to the other side when receiving hydraulic power or wind power on its front,
The generator,
A first rotor that rotates with the first propeller,
A second rotor that is arranged in a state surrounding the outer peripheral portion of the first rotor and rotates together with the second propeller,
The power generation magnet is fixed to one of the outer peripheral portion of the first rotor and the inner peripheral portion of the second rotor, and the power generation coil is fixed to the other.

  For this reason, in the natural power generator of the present invention, when the propellers (the first propeller and the second propeller) receive hydraulic power or the like, both the power generation coil and the power generation magnet rotate in opposite directions. By increasing the relative rotation speed between the power generating magnet and the power generating coil, high power generation efficiency can be obtained. Therefore, even when the natural power generation device of the present invention is used in an environment where large hydropower or wind power cannot be obtained, as in the case of the above-described small hydropower generation device, stable power can be obtained without increasing the size of the device. Can be taken out.

  In addition, the natural power generator of the present invention employs a non-contact type power transmission device (a device that transmits electric power in a non-contact manner without mechanical contact) as a power transmission unit. For this reason, the natural power generator of the present invention uses a phase rotation type generator as described above, and has a structure in which not only the power generation magnet but also the power generation coil rotates, but without providing a brush. In addition, the induced current flowing through the rotating power generating coil can be extracted to the outside. For this reason, it is not necessary to replace the brush, and the maintenance can be facilitated.

Non-contact power transmission devices that can be employed as power transmission means in the natural power generator of the present invention include electromagnetic induction type, magnetic resonance type, radio wave reception type, and electric field coupling type. Examples include a DC resonance type and an ultrasonic type, and an electromagnetic induction type power transmission device is typical.
Power transmission means,
A power supply coil provided on a rotating part that rotates together with the rotor on which the power generation coil is fixed (hereinafter, referred to as “coil-side rotor”), of the first rotor or the second rotor;
When a power receiving coil is provided at a location separated from the power feeding coil by a gap so as not to rotate together with the coil-side rotor, the power transmission means may be an electromagnetic induction type power transmission device. it can.

The natural power generation device of the present invention,
A power supply side rectifier for converting the power generated by the generator into DC,
Power-supply-side inverter means for converting the DC power rectified by the power-supply-side rectifier into AC having a frequency of 20 to 200 kHz and supplying the AC power to a power supply coil;
Power receiving side rectifying means for converting the AC power received by the power receiving coil from the power feeding coil into DC,
It is preferable that the power receiving apparatus further comprises a power receiving side inverter for converting the DC power rectified by the power receiving side rectifier into a commercial frequency and outputting the commercial frequency.

  As described above, the power supply side rectifier and the power supply side inverter are provided, and the power supply coil is driven at a high frequency, so that the power supply / reception coupler (unit combining the power generation coil, the iron core, the magnetic shield plate, and the like) is reduced in size. Will be possible. However, when the power feeding coil is driven at a high frequency, the stability of the power output to the outside through the power receiving coil tends to decrease. In this regard, as described above, by providing the power receiving side rectifier and the power receiving side inverter, it is possible to enhance the stability of the power output to the outside.

  When the natural power generator of the present invention is provided with the power supply side rectifier, the power supply side inverter, the power reception side rectifier, and the power reception side inverter as described above, the power supply side rectifier is provided. Preferably, the power supply side inverter means and the power supply coil are fixed to a portion which rotates together with the coil side rotor.

  As a result, the power generating coil of the generator and the power supply side rectifying means are not relatively rotated, and the power generating coil and the power feeding side rectifying means are connected to each other. It is possible to connect the power supply side rectifier and the power supply coil without rotating the power supply side. That is, an electric circuit located between the power generation coil and the power supply coil of the generator can be configured without the intervention of a brush or a non-contact power transmission device. Therefore, it is possible to suppress the loss of the electric power generated by the generator and further increase the power generation efficiency of the natural power generator.

  When the natural power generator of the present invention includes the power supply side rectifier, the power supply side inverter, the power receiving side rectifier, and the power receiving side inverter as described above, the power receiving side It is also preferable to connect a safety resistor, which is energized when the input voltage to the inverter means is equal to or higher than the rating and reduces the input voltage to the power receiving side inverter means, to the power supply side rectifier means.

  This is because if the voltage input from the power receiving coil to the power receiving side inverter means via the power receiving side rectifying means exceeds the rated value, the power receiving side inverter means may be broken. As a result, when the voltage input to the power receiving side inverter is about to exceed the rated value, the current flowing through the power supply side rectifying means is shunted to the safety resistor to reduce the input voltage to the power feeding coil. It becomes possible to do. This is because, when the input voltage to the power supply coil decreases, the output voltage of the power reception coil also decreases in proportion thereto, so that the voltage input to the power receiving side inverter means can be kept within the rated value.

  The output power (power taken out of the natural power generator) of the natural power generator of the present invention is not particularly limited. However, the natural power generator of the present invention is more suitable for use in small-scale power generation equipment than in large-scale power generation equipment. This is because a small-scale power generation facility has strong demands for improvement in power generation efficiency and miniaturization, and the natural power generation device of the present invention can satisfy both of these demands. Specifically, when the output power to the outside is 10 kW or less, the natural power generation device of the present invention can be suitably used.

  As described above, according to the present invention, although a phase rotation type generator having a high power generation efficiency is used, abrasion or the like occurs in the means (power transmission means) for transmitting the power generated by the generator to the outside. Therefore, it is possible to provide a natural power generator that is easy to maintain.

Hydropower device according to the present invention (Natural power generation device) is a sectional view showing a state taken along a plane including the center line L ₁ of the propeller. It is a block diagram of the electric circuit which comprises the hydraulic power generation device (natural power generation device) which concerns on this invention.

  Preferred embodiments of the natural power generator of the present invention will be described more specifically with reference to the drawings.

  The natural power generator of the present invention can be either a hydroelectric generator or a wind power generator. In both the hydroelectric generator and the wind power generator, the rotor of the generator is rotated by the rotational force of a propeller that has received natural force (hydropower or wind), and the rotation of the rotor causes the magnet for generation and the coil for generation to be relatively moved. It is common to generate an induced current in the power generating coil with a change in the magnetic field from the power generating magnet passing through the power generating magnet, and the mechanisms have many common features. In the following, for convenience of explanation, the natural power generation device of the present invention will be described by taking as an example a case where the natural power generation device is used as a hydropower generation device.

Figure 1 is a hydraulic power unit 10 according to the present invention (Natural power generation device) is a sectional view showing a state taken along a plane including the center line L ₁ of the propeller 11. FIG. 2 is a configuration diagram of an electric circuit configuring the hydraulic power generation device 10 (natural power generation device) according to the present invention. As shown in FIG. 1, the hydroelectric generator of the present invention includes a propeller 11, a generator 12, and a power transmission unit 13.

Propeller 11 receives the hydraulic to the front surface (the surface facing the left side of the paper surface in FIG. 1. Hereinafter the same.), And rotates the center line L ₁ as a rotation center. In hydroelectric apparatus 10 of the present invention is constituted by a first propeller 11a and the second propeller 11b of the propeller 11, disposed concentrically on the center line L _1. Each of the first propeller 11a and the second propeller 11b, where is constituted by a plurality of propeller blades disposed in rotational symmetry to the center line L ₁ about the inclination of the propeller blades constituting the first propeller 11a, The inclination of the propeller blade constituting the second propeller 11b is opposite to the inclination. Therefore, the direction in which the front propeller rotates when receiving hydraulic power is opposite to the direction of the first propeller 11a and the second propeller 11b. In the present embodiment, the first propeller 11a is rotated in the direction of arrow A ₁ in FIG. 1 when receiving the hydro in front, the second propeller 11b is an arrow A ₂ in FIG. 1 when receiving the hydro in front It is designed to rotate in the direction of.

The rear face center of the first propeller 11a, a first propeller shaft 11a ₁ is fixed so as to protrude rearward, the rear face center of the second propeller 11b, projecting the second propeller shaft 11b ₁ is backwards It is fixed in the state where it was done. Second propeller shaft 11b _1, the internal is formed in a hollow tubular, first propeller shaft 11a ₁ has a through state inside the second propeller shaft 11b _1. The rear end of the first propeller shaft 11a ₁ is fixed to the front end portion of the first rotor 12a in the generator 12 to be described later, the rear end of the second propeller shaft 11b _1, the second rotor in the power generator 12 to be described later 12b is fixed to the front end.

Therefore, when the first propeller 11a is rotated in the direction of arrow A ₁ to the center line L ₁ as a rotation center, the first rotor 12a is also integrated with the first propeller 11a, arrows center line L ₁ as the center of rotation is adapted to rotate in the direction of a _1, the second propeller 11b is rotated in the direction of arrow a _2, the second rotor 12b is also integral with the second propeller 11b, rotates the center line L ₁ center and rotates in the direction of arrow a ₂ as. The outer peripheral portion of the first propeller shaft 11a ₁ and the second propeller shaft 11a ₂ are bearing via a (not shown), respectively, the axis on the base portion of the second propeller inner peripheral portion and the hydraulic power unit 10 of the shaft 11a ₂ It is in a supported state.

The generator 12 converts the rotation of the propeller 11 into electric power. More specifically, the generator 12, the a generator magnet M ₁ with the rotation of the propeller 11 and power generating coil C ₁ by relatively rotating, the generator magnet through the power generating coil C ₁ M by varying the magnetic field from ₁ to over time manner, which is intended to generate an alternating current to the power generating coil C _1. In hydroelectric power generator 10 of the present embodiment, the generator magnet M ₁ and the power generation coil C ₁ is adapted to rotate relative to the center line L ₁ of the propeller 11 as a rotation center.

The generator 12, both the generator magnet M ₁ and the power generation coil C ₁ has become a phase rotation method for rotating in the opposite direction. That is, the generator 12, in addition to the power generating magnet M ₁ of the and the power generating coil C _1, which is assumed having a first rotor 12a and the second rotor 12b. The first rotor 12a is connected to the first propeller 11a via the first propeller shaft 11a _1, and is configured to rotate integrally with the first propeller 11a. On the other hand, the second rotor 12b is connected to the second propeller 11b via the second propeller shaft 11b _1, and is configured to rotate the second propeller 11b and integrally. The second rotor 12b is a cylindrical member arranged so as to surround the outer periphery of the first rotor 12a.

The outer peripheral portion of the first rotor 12a, or, among the inner peripheral portion of the second rotor 12b, either one is power magnet M ₁ of the fixed, power generating coil C ₁ is fixed to the other. In hydroelectric power generator 10 of this embodiment has a power generating magnet M ₁ is fixed to the outer periphery of the first rotor 12a, the inner circumferential portion of the second rotor 12b, at a position facing the power generating magnet M ₁ and a power generating coil C ₁ is fixed. Therefore, when the first propeller 11a and the second propeller 11b is rotated in reverse by receiving the hydraulic to each of the front side, the generator magnets M ₁ and generating coils C ₁ also adapted to rotate in opposite directions, respectively I have. Therefore, the hydraulic power generator 10 according to the present invention can increase the relative rotation speed between the power generating magnet and the power generating coil in the power generator 12 and obtain high power generation efficiency.

Usually, a plurality of the power generating magnets M ₁ and the power generating coils C ₁ are provided for each of the generators 12. The plurality of power generation magnets M ₁ and the plurality of power generation coils C ₁ are provided at rotationally symmetric positions with respect to the center line L ₁ . Among them, the number of power generating coil C ₁ is determined appropriately in accordance with the output phase number of the generator 12. For example, when the output of the generator 12 and the two phases, the number of power generating coil C ₁ is 2 × N (N is an arbitrary natural number. Hereinafter the same.) Is a, the output of the generator 12 3 when the phase number of the generator coil C ₁ is a 3 × N pieces. In hydroelectric power generator 10 of this embodiment is the output of the generator 12 and 3-phase, and the number of power generating coils C ₁ and 3 × N pieces. As described later, the hydraulic power unit 10 of the present embodiment, when employing a structure which converts the power generated by the generator coils C ₁ to a high frequency at the power feeding side inverter unit 17, the output phase of the generator motor 12 Is set to three phases, the ripple at the time of conversion into a high frequency by the power supply side inverter means 17 can be reduced.

The power transmission means 13 is for transmitting the electric power generated by the generator 12 to the outside (outside the hydraulic power generator 10). As already mentioned, the hydraulic power unit 10 according to the present invention, the power generating coil C ₁ to take out electric power generated by the generator 12 is provided on the second rotor 12b to rotate relative to the stationary system. In order to extract the electric power generated in the rotating system to the stationary system, it is usually necessary to use a “brush” or the like. In this respect, the hydraulic power unit 10 according to the present invention, as a power transmission means 13, by using a power transmission device of a non-contact manner, resulting in the power generation coil C ₁ in the rotating system induce current (power) It can be taken out to a stationary system outside (external equipment or the like) without using a brush.

Specifically, the power transmission device 13 includes a power feeding coil 13a and a power receiving coil 13b arranged with a gap therebetween, and the power is transmitted from the power feeding coil 13a to the power receiving coil 13b through the gap. Can be sent. Power supply coil 13a is rotating portion of, for rotation with the rotor of the generator coil C ₁ is fixed side (the hydraulic power unit 10 of the present embodiment the second rotor 12b) of the first rotor 12a or the second rotor 12b (in the hydraulic power unit 10 of the present embodiment, the rear end portion of the rotating shaft portion 12b ₁ which protrudes rearward from the rear end center of the second rotor 12b) are provided. On the other hand, the power receiving coil 13b is provided in a portion provided in a stationary system in the hydraulic power generation device 10 such as a base portion (not shown) of the hydraulic power generation device 10 (in the hydraulic power generation device 10 of this embodiment, It is provided at the front end of the power receiving coil support member 15 provided on the base portion of the device 10.

Thus, the feeding coil 13a, while rotating together with the power generating coil C ₁ fixed to the second rotor 12b to the center line L ₁ about, the power receiving coil 13b is in a state not to move. Power supply coil 13a is electrical wires _{W 1,} W 2, _{W 3,} etc. are electrically connected to the power generating coil _{C 1} through. Therefore, the propeller 11 is rotated by the hydraulic and induced current to the power generating coil C ₁ occurs, current flows to the power supply coil 13a, a magnetic field is generated around the power supply coil 13a.

Here, since the power supply coil 13a is relatively rotated with respect to the power reception coil 13b, the magnetic field from the power supply coil 13a passing through the power reception coil 13b changes with time. Therefore, an induced current is generated in the power receiving coil 13b due to the change in the magnetic field. Since the power receiving coil 13b is in a stationary system, the induced current flowing through the power receiving coil 13b can be easily taken out through the electric wires W ₄ , W ₅ , W _6, etc. without using a brush or the like. It has become.

  The power supply coil 13a and the power reception coil 13b are not particularly limited as long as they can exhibit the above-described functions. However, in the hydraulic power generator 10 of the present embodiment, the current whose frequency has been increased by the power supply-side inverter means 17 described later flows through the power supply coil 13a, and the induced current flowing through the power reception coil 13b also has a high frequency in response thereto. When such a high-frequency current flows through the conductor, the electric resistance of the conductor increases due to the skin effect, which adversely affects the power generation efficiency of the hydraulic power generator 10. For this reason, it is preferable that the power supply coil 13a and the power reception coil 13b be formed using a litz wire (a conductive wire that is divided into a plurality of wires and twisted). This makes it possible to maintain the power generation efficiency of the hydroelectric power generator 10. Also in the hydraulic power generator 10 of the present embodiment, the power supply coil 13a and the power reception coil 13b are formed of litz wires.

Further, it is preferable that each of the power supply coil 13a and the power reception coil 13b is formed by winding a conductive wire around a flat ferrite core in one to three stages with 7 to 12 turns per stage. Thereby, the transmission efficiency from the power feeding coil 13a to the power receiving coil 13b can be increased. The ferrite core preferably has a diameter of 150 to 300 mm, and the conductor preferably has a cross-sectional area of 3.5 to 8.0 mm ² . Also in the hydraulic power generator 10 of the present embodiment, the power feeding coil 13a and the power receiving coil 13b satisfy the above-described configuration.

  The AC power generated by the generator 12 may be directly input to the power supply coil 13a. However, since the frequency of the AC power generated by the generator 12 is determined by the rotation speed of the propeller 11, the frequency of the AC power generated by the generator 12 does not increase so much. When such low-frequency AC power is input to the power feeding coil 13a, if the transmission efficiency from the power feeding coil 13a to the power receiving coil 13b is to be increased, the power feeding coil 13a, the power receiving coil 13b, etc. It is necessary to increase the size to some extent.

In this respect, the hydraulic power unit 10 of the present embodiment, as shown in FIG. 1, between the power generating coil C ₁ of the generator 12 and the power supply coil 13a, and the feed-side rectifying means 16 feed side inverter unit 17 Are provided. As shown in FIG. 2, the power supply side rectifier 16 is a rectifier circuit using a rectifier such as a diode, and is configured by an electric circuit that converts AC power generated by the generator 12 into DC. The power supply-side inverter means 17 is a modulation circuit using a switching element such as a transistor, and is configured by an electric circuit that converts DC power output from the power supply-side rectification means 16 into AC power having a predetermined frequency. Have been. In the hydroelectric generator 10 of the present embodiment, a SiC inverter circuit using silicon carbide (SiC) as a semiconductor is used as the power supply side inverter means 17. The frequency of the AC power output from the power supply side inverter means 17 is controlled by a control circuit 17a provided therewith.

  The power generated by the generator 12 is input to the power supply coil 13a in a state where the frequency is increased by the power supply-side inverter means 17, so that the transmission efficiency of the power transmission means 13 is increased, and the power supply coil 13a and the power The size of the coil 13b can be reduced. The frequency of the output power of the power supply side inverter means 17 is not particularly limited as long as it is higher than the output power of the generator 12, but is usually about 20 to 200 kHz. In the hydroelectric power generator 10 of the present embodiment, the frequency of the output power of the power supply side inverter means 17 is about 40 kHz.

As shown in FIG. 1, the power supply side rectification means 16, the power supply side inverter means 17 (including the control circuit 17a), and the power supply coil 13a are fixed to a portion which rotates together with the second rotor 11b. Accordingly, as a power generating coil C ₁ of the generator 12 and the feed-side rectifying means 16 and the feed-side inverter unit 17 and the power supply coil 13a does not rotate relative, these electric wires W _1, W _2, it is possible to be connected by W _3.

  However, as described above, when the power feeding coil 13a is driven at a high frequency, the stability of the power output from the power receiving coil 13b to the subsequent stage tends to decrease. For this reason, in the hydroelectric power generator 10 of the present embodiment, the AC power output from the power receiving coil 13b to the subsequent stage is input to the power receiving side rectifier 18 and converted into DC power, and then input to the power receiving side inverter 19. To be converted into desired AC power to be used. This makes it possible to enhance the stability of the electric power output from the hydraulic power generator 10 to the outside. The power receiving side rectifier 18 is configured by an electric circuit similar to the power supply side rectifier 16, and the power receiving side inverter 19 is configured by an electric circuit similar to the power supply side inverter 17. A capacitor can be added to the power receiving side rectifier 18 and the power receiving side inverter 19 in order to suppress the occurrence of ripples that occur during rectification or switching.

  Further, in the hydraulic power generator 10 of the present embodiment, a safety resistor (not shown) is connected to the power supply side rectifier 16. That is, when the voltage input from the power receiving coil 13b to the power receiving inverter 19 via the power receiving rectifier 18 exceeds the rated value, the power receiving inverter 19 may be broken. In this regard, when the voltage input to the power receiving side inverter means 19 is about to exceed the rated value, the current flowing through the power supply side rectifying means 16 is shunted to the above-mentioned safety resistor and supplied to the power supply coil 13a. By reducing the input voltage, the output voltage of the power receiving coil 13b is reduced, so that the voltage input to the power receiving side inverter means 19 can be kept within the rated value. When the voltage drops by about 5 to 10% by the safety resistor, the safety resistor is disconnected after a predetermined time (about 5 to 15 seconds) has elapsed.

  The above-described hydroelectric power generator 10 of the present embodiment uses the phase rotation type generator 12 having high power generation efficiency, and also has the power transmission means 13 for transmitting the power generated by the generator 12 to the outside. Wear and the like do not occur, so that maintenance is easy and the life is long. For this reason, the hydroelectric generator 10 of the present embodiment can be suitably used even in an environment that is frequently driven 24 hours a day, 7 days a week. In addition, the hydroelectric generator 10 of the present embodiment can be downsized. Therefore, the hydroelectric power generation device 10 of the present embodiment can be suitably used even in a small-scale power generation facility in which a demand for improvement in power generation efficiency and a demand for miniaturization are strong. Specifically, it can be suitably used when the output power is 10 kW or less, and can be particularly preferably used when the output power is 0.3 to 5 kW. Such a small-scale hydroelectric generator 10 is expected to help supply stable electric power in an area where there is no large-scale river or in a developing country where power generation facilities are not provided.

DESCRIPTION OF SYMBOLS 10 Hydroelectric generator 11 Propeller 11a 1st propeller 11a ₁ 1st propeller shaft 11b 2nd propeller 11b ₁ 2nd propeller shaft 12 Phase rotation type generator (generator)
12a First rotor 12b Second rotor 13 Non-contact power transmission device (power transmission means)
13a power supply coil 13b power reception coil 14 rotating shaft part 15 power reception coil support member 16 power supply side rectification means 17 power supply side inverter means 17a control circuit 18 power reception side rectification means 19 power reception side inverter means C ₁ power generation coil L ₁ propeller Center line M ₁ magnet for power generation W ₁ electric wire W ₂ electric wire W ₃ electric wire W ₄ electric wire W ₅ electric wire W ₆ electric wire

Claims (7)

A propeller that rotates when it receives hydraulic or wind power,
When the propeller rotates, the generator magnet and the generator coil rotate relatively to generate an alternating current in the generator coil, and
A natural power generator having power transmission means for transmitting the power generated by the generator to the outside,
As a generator, use a phase rotation type generator,
A natural power generator, wherein a non-contact power transmission device is used as power transmission means.
The propeller
A first propeller that rotates to one side when receiving hydraulic or wind power on its front,
It is arranged concentrically with the first propeller, and is configured with a second propeller that rotates to the other side when receiving hydraulic power or wind power on the front surface thereof,
The generator is
A first rotor that rotates with the first propeller,
A second rotor that is arranged in a state surrounding the outer peripheral portion of the first rotor and rotates together with the second propeller,
The natural power generator according to claim 1, wherein the power generation magnet is fixed to one of the outer peripheral portion of the first rotor and the inner peripheral portion of the second rotor, and the power generation coil is fixed to the other. .
Power transmission means,
A power supply coil provided on a rotating part that rotates together with the rotor on which the power generation coil is fixed (hereinafter, referred to as “coil-side rotor”), of the first rotor or the second rotor;
3. The natural power generator according to claim 2, further comprising a power receiving coil disposed at a position separated by a gap from the power feeding coil so as not to rotate together with the coil-side rotor.
A power supply side rectifier for converting the power generated by the generator into DC,
Power-supply-side inverter means for converting the DC power rectified by the power-supply-side rectifier into AC having a frequency of 20 to 200 kHz and supplying the AC power to a power supply coil;
Power receiving side rectifying means for converting the AC power received by the power receiving coil from the power feeding coil into DC,
4. The natural power generator according to claim 3, further comprising a power receiving-side inverter for converting the DC power rectified by the power receiving-side rectifier into a commercial frequency and outputting the commercial frequency.
The natural power generator according to claim 4, wherein the power supply-side rectifier, the power supply-side inverter, and the power supply coil are fixed to a portion that rotates together with the coil-side rotor.
The natural force according to claim 4 or 5, wherein a safety resistor that is energized when the input voltage to the power receiving side inverter means is equal to or higher than a rating and reduces the input voltage to the power receiving side inverter means is connected to the power supply side rectifying means. Power generator.
  The natural power generator according to any one of claims 1 to 6, wherein a rated value of the output power transmitted to the outside is set to 10 kW or less.

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