JP2010207052A - Power generator and power generation system with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generator capable of generating power at a predetermined voltage and a predetermined current, even if an outside energy is excessively weak or strong in generating the power using water power or wind power. <P>SOLUTION: The generator includes a magnet rotor 24 rotating upon a rotation force from a drive source, and a stator coil 25 oppositely disposed to the magnetic pole of the magnet rotor. The magnet rotor 24 includes a rotating shaft 13 rotatably pivoted on a housing 21, and permanent magnets forming a plurality of magnetic poles on a concentric circle around at the rotating shaft. The stator coil 25 includes a plurality of coreless windings and three-phase output terminals which are disposed so as to oppose the magnetic poles formed on the rotor 24. The coreless winding includes three effective output windings or a multiple of three, and is connected to an output terminal via a switching means so that the total number of turns can be changed to be large or small. The total number of turns is made to be small when the rotation force from the drive source is large, and large when the rotation force is small. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power generator that converts fluid energy such as wind power, hydraulic power, and heat into electric energy and a power generation system including the power generator, and relates to an improvement of a power generation mechanism.

  In general, this type of power generation device is widely known as a device that converts energy such as wind power, hydraulic power, and heat into electric energy. In addition, the mechanism of generating electricity is widely known as a mechanism for rotating a rotating rotor similar to an electric motor with external energy and outputting a current generated in a coil by the rotational force.

  As a conventionally known generator, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2008-086128), a magnet rotor having a plurality of magnetic poles arranged in a rotational direction is rotatably attached to a housing, and the rotor is surrounded on the inner wall of the housing. Thus, the coil frame is arranged, and a winding is wound around the coil frame to constitute a power generation unit. Three windings or multiples thereof can be used to obtain a three-phase alternating current.

  In the field-type synchronous generator disclosed in Patent Document 1, since an electromotive force is generated in a coil wound around a core, a large magnetic field attractive force acts at the time of low-speed rotation or startup, resulting in a large resistance. (Cogging torque) acts. For this reason, effective power generation cannot be performed at low wind speeds. It is also known that heat generated when an electromotive force is generated in a coil must be efficiently dissipated.

  Therefore, for example, Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-320364) proposes a method using a coreless coil to reduce the cogging torque described above. This publication proposes a power generation mechanism in which a magnet rotor is formed by arranging a plurality of magnetic poles concentrically around a rotation axis, and forming a coil layer by arranging a plurality of windings in parallel with the magnetic poles.

Japanese Patent Laying-Open No. 2008-086128 (FIG. 8) JP 2002-320364 A (FIGS. 5 and 6)

  When the magnet rotor is rotationally driven to generate an electromotive force in the stator coil as described above, energy changes such as wind power and hydraulic power become a problem. For example, in the case of a wind power generation system, it is required that a current of a predetermined voltage can be obtained even in a light wind state, and that stable power can be obtained even under a strong wind. Conventionally, when an electromotive force is generated in a coil by rotating one of a coil and a magnet forming a magnetic pole with external energy, the electromotive force characteristic of the coil and the magnetic field characteristic of the magnet are set constant. Therefore, the lower limit value when the external energy operable as the power generation system is weak and the upper limit value when the external energy is strong are set within a certain range.

  In other words, it is known that in a synchronous generator, when the rotational force of wind power or the like is very small, a cogging torque acts on a drive rotating shaft that rotates at a low speed and stable electric power cannot be obtained. Similarly, when the rotational force of wind power or the like becomes excessive, the rotating shaft rotates excessively at a high speed, and the frequency of power generated in the coil increases. When the output power is connected to the power system in this way, the frequency decreases if the rotation speed of the input source falls below the synchronization speed, and the frequency increases and stabilizes if the rotation speed becomes faster than the synchronization speed. There arises a problem that power cannot be obtained. As described above, since this type of power generation system is installed in a place where an input within a predetermined range (predetermined strength) can be obtained, it has been difficult to provide a wide range of uses, particularly as a small-scale facility.

  Therefore, the present inventor has come up with the idea that the power generation possible range can be set in a wide range by changing the inductance of the coil according to the strength of the external energy.

  The main object of the present invention is to provide a generator capable of generating a predetermined voltage and a predetermined current even when the external energy is weak or excessive when generating electricity with hydro wind. It is another object of the present invention to provide a system that can obtain power of a predetermined voltage and current even when the wind power generation system is in a weak wind state or in an excessively strong wind state.

  In order to achieve the above object, the present invention, when generating an electromotive force in a stator coil by rotation of a magnet rotor, comprises three effective output windings or multiples of the effective windings and the total number of turns. It is characterized by being connected to the output terminal via a switching means so that it can be switched between large and small. As a result, when external energy such as wind power is too small (slight wind), the inductance is set large, and when external energy is excessive (strong wind), the inductance is set small so that stable voltage and current can be maintained even if the external energy such as wind power changes strongly. Can be output.

  The configuration for that will be described in detail. A generator comprising a magnet rotor that rotates by receiving a rotational force from a drive source, and a stator coil disposed opposite to the magnetic pole of the magnet rotor, the magnet rotor having a housing And a permanent magnet that forms a plurality of magnetic poles concentrically around the rotation axis. The stator coil includes a plurality of coreless windings disposed so as to face the magnetic poles formed on the magnet rotor, and a three-phase output terminal that outputs the electric power generated in the plurality of windings to the outside. To do. Therefore, the plurality of coreless windings are composed of three effective output windings or multiples thereof, and are connected to the three-phase output terminal via switching means so that the total number of turns can be switched between large and small. This switching means is connected to the control means so that the total number of turns is small when the rotational force from the drive source is large and the total number of turns is large when the rotational force is small.

  As described above, the present invention provides a switching means that can switch the total number of turns when the effective output winding composed of a plurality of coreless windings or three or multiples thereof is connected to the three-phase output terminal. Since the switching means is switched according to the magnitude of the rotational force from the drive source, the following effects can be obtained.

  Even if the external energy such as wind power is too small (slight wind), the inductance can be increased by setting the total number of turns of the winding generating the electromotive force. For this reason, the current generated in the coil increases and can be output to the outside. In addition, when the external energy is excessive, such as strong winds, and the drive rotating shaft rotates at an excessively high speed, the frequency of the generated power is stable without changing abnormally by changing the inductance value of the coil to generate power to a small value. Power generation is possible.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the whole structure of the electric power generation system concerning this invention. The structure of the generator in the system of FIG. 1 is shown, (a) is a perspective view which shows the structure of a rotor and a stator, (b) is sectional drawing of the assembly state. Explanatory drawing which shows the cross-sectional structure of the stator coil of the apparatus of FIG. The case where the stator coil is composed of one layer in the apparatus of FIG. 2 is shown in (a), and the case where the stator coil is composed of two layers is shown in (b). FIG. 2 shows a first embodiment when the inductance of the stator coil is switched in the apparatus of FIG. 2, (a) is an explanatory view of a coil connection state, and (b) is a perspective view of the coil configuration. FIG. 2 shows a second embodiment in which the inductance of the stator coil is switched in the apparatus of FIG. 2, (a) is an explanatory view of a coil connection state, and (b) is a perspective view of the coil configuration. FIG. 3 is an explanatory diagram of a switching circuit that switches the inductance of the stator coil in the apparatus of FIG. 2. FIG. 3 is a circuit explanatory diagram of an electric brake when the rotating shaft is excessively rotated in the apparatus of FIG. 2.

  The present invention will be described in detail below based on the preferred embodiments of the present invention shown in the drawings. The power generation system according to the present invention is composed of [drive source A], [power generation unit B], and [power control unit C] as schematically shown in FIG.

[Power generation system]
The power generation system according to the present invention is composed of [drive source A], [power generation unit B], and [power control unit C] as schematically shown in FIG. The drive source A converts energy from a power generation source such as wind power, hydraulic power, and steam into rotational motion. The illustrated system shows wind power generation, and the drive source A includes a tower frame 10, a nacelle 11 mounted on the tower frame 10, and a blade (wind vane) 12 rotatably attached to the nacelle 11. . Depending on system installation conditions, the tower frame 10 is robustly configured to position the blades 12 at a predetermined height above the ground. A nacelle 11 is attached to the tower frame 10 so as to be rotatable in the wind direction. The nacelle 11 includes a drive rotating shaft 13, a hub 14, a speed increaser 15, and a generator 20 (a power generation unit B described later).

  The drive rotating shaft 13 is provided with a hub 14, and the blade 12 is fixed to the hub 14. The blade 12 is configured in a blade shape with excellent efficiency for converting wind power into rotational force. The drive rotary shaft 13 rotated by the blade 12 is connected to a generator 20 via a speed increaser 15 and a brake 16. Reference numeral 17 denotes an anemometer, which measures the wind force at that time and transmits it to a control unit (described later). 18 is a control panel, and 19 is a high-voltage distribution line of the output unit C.

  In this way, the blade 12 mounted on the tower frame 10 rotates by receiving wind force and transmits the rotational force to the drive rotating shaft 13. A generator 20 is connected to the drive rotating shaft 13 via a speed increaser 15 to convert wind energy into electric energy. The current generated by the generator 20 is transmitted from the transformer 19 a to the high voltage distribution line 19 via the control panel 18. The high-voltage distribution line 19 is usually composed of a three-phase AC transmission line.

[Control panel configuration]
In the power generation system configured as described above, three-phase AC power generation is required from a normal commercial power transmission system as the power generator 20 described later. Although the configuration of the generator 20 will be described later, the control panel 18 is configured to perform the following two functions. The first function is to boost the electric power generated by the generator 20 to a predetermined voltage and transmit it to the high voltage distribution line 19 or temporarily store it in a storage battery (not shown). The second function is to detect whether or not the wind force is within the entire operating range by detecting the rotational speed of the anemometer 17 provided in the tower frame 10 described above. This control means (control panel) 18 executes the following judgment and controls it with a control CPU or an electric circuit (logic circuit), for example. When it is determined that the rotation speed of the anemometer 17 is equal to or greater than a preset allowable maximum value (Rmax), the brake (for example, mechanical brake mechanism) 16 is operated to gradually decrease the rotation speed of the blade 12. This prevents the blade 12 or the nacelle 11 from being damaged.

[Generator]
A generator 20 and an encoder 30 are built in the drive rotation shaft (hereinafter referred to as “rotation shaft”) 13. The generator 20 converts the rotation of the rotating shaft 13 into electric energy, and the encoder 30 detects and controls the number of rotations of the rotating shaft 13. As shown in FIG. 2B, the generator 20 supports the rotary shaft 13 on the housing 21 with bearings 23a and 23b. A disk-shaped rotor frame Rf is integrally attached to the rotating shaft 13 as shown in FIG. The rotor frame Rf is made of, for example, synthetic resin and a metal rotary shaft 13 that is integrally formed by insert molding. At the same time, a magnet Mg and a core Rc are integrally embedded in a rotor frame Rf forming a disk shape.

  The illustrated one shows a case where eight magnetic poles Mn1 to Mn8 are formed on the magnet rotor 24. In other words, NS magnetic poles are formed at eight positions on the disk-shaped rotor frame Rf at intervals of 45 degrees. As shown in FIG. 3, the magnetic poles Mn1 to Mn8 have permanent magnets Mg (Mg1 to Mg8) on the resin frame adjacent to each other as shown in FIG. 6B (magnetic pole arrangement diagram). Are arranged in an annular shape. Adjacent magnetic poles are magnetically connected by a soft magnetic core member Rc and are arranged so as to form N or S poles on the front and back surfaces of the core.

  The soft magnetic core members Rc (Rc1 to Rc8 in the drawing) are arranged between the permanent magnets Mg (Mg1 to Mg8) arranged in an annular shape, and are made of a soft magnetic material such as iron. The soft magnetic core member Rc is in contact with the permanent magnet Mg and is magnetically joined. As a result, the magnetic pole forming surfaces Mf (Mf1 to Mf8) are formed on the front and back surfaces of the soft magnetic core member Rc, and the magnetic poles Mn1 to Mf8 are formed on these surfaces. The magnetic pole Mn is disposed at a position facing windings Co1 to Co6 of the stator coil 25 described later.

  Then, the magnetic pole forming surface Mf of the soft magnetic core member Rc is arranged like NS-NS on the same circle centering on the rotating shaft 13 as shown in FIG. At this time, if the corner portion of the magnetic pole forming surface Mf is sharpened at an acute angle, the magnetic field concentrates on this corner, and a leakage magnetic field is generated between the adjacent magnetic poles. In order to avoid this magnetic concentration, the magnetic pole forming surface Mf of the soft magnetic core member Rc is corner cut. FIG. 3B shows a case where the corner cut is formed in a rounded corner shape, and FIG. 3C shows a case where the corner cut is formed in a corner corner shape, both of which are formed on the magnetic pole forming surface Mf. The magnetic field is not leaked to the magnetic poles of the other magnetic pole forming surfaces adjacent to each other.

  Thus, the magnet rotor 24 is formed in a disk shape by the rotor frame Rf, the permanent magnet Mg, and the core Rc, and magnetic poles Mn are formed on the front and back surfaces thereof at a predetermined interval (the illustrated one is 45 degrees). The one shown in the figure is composed of four poles or a multiple thereof in relation to AC power generation.

  A stator coil 25 is built in the housing 21 so as to face the magnet rotor 24 described above. As shown in FIG. 2, the stator coil 25 is composed of three or multiple (six in the drawing) windings Co <b> 1 to Co <b> 6 so as to face the magnetic poles Mn <b> 1 to Mn <b> 8 formed on the magnet rotor 24. The stator coil 25 is embedded and integrated in a state in which a plurality of windings are wound around coil frames Cf1 and Cf2 formed in a disk shape with resin or the like.

  As shown in FIG. 4, the stator coil 25 includes a first coil body CR <b> 1 arranged at one location on the front side of the magnet rotor 24 (see FIG. 4A), and the front and back surfaces 2 of the magnet rotor 24. There are cases in which the first coil body CR1 and the second coil body CR2 are arranged at locations (see FIG. 4B). In the case of the former coil 1 layer structure, there exists the characteristic which can be comprised compactly and compactly. In the case of the latter two-layer structure, there is a feature that a large output can be configured.

  As described above, the magnet rotor 24 and the stator coil 25 of the present invention are configured such that the magnetic pole pair coil windings are in a 4: 3 relationship and output three-phase AC electricity. Therefore, the present invention is characterized in that the inductance of the stator coil 25 thus configured is variably adjusted. For this reason, the rotary shaft 13 is provided with an encoder 30 and a sensor Se for detecting the rotational speed.

  A configuration for changing the inductance of the stator coil 25 will be described. The case where the stator coil 25 is composed of the first coil body CR1 and the second coil body CR2 having the same structure (same inductance) is configured as the first coil body CR1 and the second coil body CR2 having different inductances as the first embodiment. The case will be described as a second embodiment.

[First Embodiment]
As shown in FIGS. 5A and 5B, the magnet rotor 24 includes, for example, magnetic poles Mn1 to Mn8 in which NS poles are alternately arranged in an 8-pole (multiple pole of 4) and rotation shaft 13. It is configured. In the drawing, xx represents the center of rotation. In the stator coil 25, the first coil body CR1 is arranged on the front surface side of the magnet rotor 24, and the second coil body CR2 is arranged on the back surface side with the same structure. As shown in FIG. 5B, the first and second coil bodies CR are composed of six windings Co1 to Co6, and Co1 and Co4, Co2 and Co5, and Co3 and Co6 that generate electromotive forces in the same phase are Electrically connected. Such first and second coil bodies CR1 and CR2 are connected by the switching means 35 as shown in FIG. The switching means 35 is set to have a large inductance when connected in the direction shown by Sa, and is set to a small inductance when connected in the direction shown by Sb.

[Second Embodiment]
As shown in FIGS. 6A and 6B, the magnet rotor 24 includes, for example, magnetic poles Mn1 to Mn8 in which NS poles are alternately arranged in an 8-pole (multiple pole of 4), and the rotating shaft 13. (It is the same structure as 1st Embodiment.). The stator coil 25 has a first coil body CR1 disposed on the front surface side of the magnet rotor 24 and a second coil body CR2 disposed on the back surface side. The first coil body CR1 is composed of Co1, Co2, Co3 and Co4, Co5, and Co6. Co1 and Co4, Co2 and Co5, and Co3 and Co6 that generate electromotive forces in the same phase are electrically connected.

  On the other hand, the second coil body CR2 is composed of three windings Co1 to Co3. Such first and second coil bodies CR1 and CR2 are connected by the switching means 36 as shown in FIG. When this switching means 36 is connected in the direction shown by Sa in the same figure, electric power generated in the first coil body CR1 is output, and the inductance is set large. Further, when the wires are connected in the direction shown by Sb in the same figure, the electric power generated in the second coil body CR2 is output, and the inductance is set to be small.

[Configuration of control means]
The inductance of the stator coil 25 configured as described above is switched between large and small by the switching means 35 and 36 (hereinafter referred to as “first switching means ISW”). The control CPU 31 incorporated in the nacelle 11 described above switches the switching means 35 (36) when the rotational speed detected from the encoder 30 or the rotational speed detected from the anemometer 17 is equal to or less than a preset rotational speed Rx. Switch to the Sa side and set the inductance to large. Similarly, when the rotational speed becomes equal to or higher than the preset rotational speed Rx, the switching means 35 (36) is switched to the Sb side to switch the inductance from large to small.

A specific configuration of the first switching means ISW will be described. The first switching means ISW (the aforementioned switching means 35 and 36) switches the windings Co1 to Co6 of the first coil body CR1 and the windings Co1 to Co6 and the output line of the second coil body CR2. As a result, the inductance value of the coil used for power generation is changed in size. The switching configuration will be described with reference to FIG.

  FIG. 7A shows a case where the coil used for power generation is switched between the first coil body CR1 alone and the first coil body CR1, CR2. The first coil body CR1 opposed to the surface (upper surface in FIG. 2) of the magnet rotor 24 is composed of windings Co1 to Co8 (multiples of 4), and windings Co1 and Co4, Co2 and Co5, Co3. And Co6 are arranged in the same phase. Therefore, the first phase (U phase) is the windings Co1 and Co4, the second phase (V phase) is the windings Co2 and Co5, and the third phase (W phase) is the windings Co3 and Co6. Connected to.

  Therefore, switching means ISW1 (first phase output terminal portion), ISW2 (second phase output terminal portion), and ISW3 (third phase output terminal portion) are provided at the connection portion between the first coil body CR1 and the second coil body. . A control means (such as a control CPU) (not shown) simultaneously controls ON / OFF of ISW1, ISW2, and ISW3, and power is output from the first coil body CR1 only to the three-phase output terminal. It switches when outputting from both 2nd coil bodies CR2. As a result, the former has a small inductance, and the latter has a large inductance. Therefore, the control means sets the rotational speed of the rotary shaft 13 based on, for example, a reference rotational speed (allowable minimum rotational speed) stored in the storage means in which the rotational speed of the rotary shaft 13 is preset by a signal from the sensor Se of the encoder 30 described above. When the speed becomes low, the inductance value is set large by the switching means ISW.

  In FIG. 7B, the switching means ISW1 to ISW3 switch whether the first coil body CR1 is composed of three windings Co1, Co2, Co3 or six windings Co1 to Co6. Shows the case where the total number of windings of the coil used for power generation is changed. Inductance when one of windings Co1 and Co4 located in the same phase is connected to the output terminal of the first phase (U phase) via switching means ISW1 and when both windings Co1 and Co4 are connected The value is switched.

  Similarly, when one of windings Co2 and Co5 located in the same phase is connected to the output terminal of the second phase (V phase) via switching means ISW2, both windings Co2 and Co5 are switched and connected. . Similarly, when one of windings Co3 and Co6 located in the same phase is connected to the output terminal of the third phase (W phase) via switching means ISW3, both are switched and connected. 7 (a) and 7 (b) show the case of Y-Y connection, but the inductance value can be switched in the same way even in the case of delta connection or V connection, and the N connection shown in the figure is an intermediate line. .

[Configuration of electric brake]
When the rotary shaft 13 rotates at an excessively high speed, an electric brake is applied to the stator coil 25 described above. The configuration will be described with reference to FIG. As shown in FIG. 8, the stator coil 25 is composed of a first coil body CR1 and a second coil body CR2, and the inductance is switched between large and small by the first switching means ISW. The coil bodies CR1, CR2 are connected to the three-phase output terminals OP1, OP2, OP3. The output terminal OP is connected to the charger 32, and the charger 32 is connected to an external power transmission line. In the figure, 33 is a rectifier, and 34 is a load resistor. The output terminal OP is provided with second switching means BSW1, BSW2, BSW3. When the output terminal OP is in the open state, the power generated in the first coil body CR1 and the second coil body CR2 is the power from the terminal in the direction of the solid line arrow in the figure. Is sent to the external power line. Therefore, when the second switching means BSW is closed, a short circuit is formed, and an electric brake acts on the rotary shaft 13 from the first and second coil bodies CR1 and CR2.

  Therefore, the control means (not shown) opens the second switching means BSW when the number of rotations detected from the sensor Se of the encoder 30 is preset, and the stored maximum allowable number of rotations is reached. Switch from state to closed state. Then, an electric brake acts on the rotating shaft 13. In this case, the control means switches so that the electric brake acts only on the first coil body CR1 (or the second coil body CR2), or the electric brake acts on both the first coil body CR1 and the second coil body CR2. It is also possible to configure so that it can be switched.

  Further, when the rotating shaft 13 rotates at an excessively high speed, the control means switches the inductance of the coil used for power generation from the first switching means ISW from small to large, and at the same time operates the electric brake by the second switching means BSW. It is possible to obtain a larger braking force by controlling to a greater value.

A drive source B power generation unit C power control unit 10 tower frame 11 nacelle 12 blade 13 drive rotary shaft 14 hub 15 speed increaser 16 brake 17 anemometer 18 control panel 19 high voltage distribution line 19a transformer 20 generator 21 housing 22 drive rotation Shaft 24 Magnet rotor 25 Stator coil 30 Encoder 31 Control CPU
Rf Rotor frame Mn1 to Mn8 Magnetic poles Rc1 to Rc8 Core xx Rotation center CR1 First coil body CR2 Second coil bodies Co1 to Co6 Winding Se Encoater sensor ISW First switching means BSW Second switching means 32 Chargers OP1 OP3 Three-phase output terminal 33 Rectifier 34 Load resistance

Claims (6)

A generator composed of a magnet rotor that rotates by receiving a rotational force from a drive source, and a stator coil disposed opposite to the magnetic poles of the magnet rotor,
The magnet rotor is
A rotating shaft rotatably supported by the housing;
A permanent magnet that forms a plurality of magnetic poles on a concentric circle around the rotation axis;
Consists of
The stator coil is
A plurality of coreless windings arranged to face the magnetic poles formed on the magnet rotor;
A three-phase output terminal for outputting the electric power generated in the plurality of windings to the outside;
Consists of
The plurality of coreless windings are composed of three or multiple effective output windings and are connected to the three-phase output terminal via switching means so that the total number of turns can be switched between large and small,
The switching means is connected to the control means so as to reduce the total number of turns when the rotational force from the drive source is large, and to increase the total number of turns when the rotational force is small. The magnet rotor is composed of a rotating shaft and a plurality of NS magnetic poles arranged annularly around the rotating shaft,
The stator coil is composed of a plurality of coreless windings arranged in an annular shape so as to face the magnetic poles,
The NS magnetic pole of the magnet rotor includes a plurality of permanent magnets arranged so that the same magnetic poles are adjacent to each other around the rotation axis, and soft magnets arranged so as to be magnetically coupled between the permanent magnets. Formed on the magnetic pole forming surface of the core member,
The generator according to claim 1, wherein the plurality of magnetic pole forming surfaces arranged in an annular shape are corner-cut so that adjacent corner portions do not concentrate magnetically. The magnet rotor is configured to form a magnetic field in the front and back direction in a disk shape having the rotation shaft at the center,
The plurality of coreless windings constitute a pair of front and back coil bodies that are disposed so as to sandwich the disk-shaped magnetic pole from the front and back directions,
The front and back coil bodies composed of the plurality of windings are configured so that the inductance values are substantially the same,
The switching means is connected to the three-phase output terminal.
Connect the windings of either the front or back coil body,
The generator according to claim 1, wherein the inductance values are made different from each other by connecting the windings of the coil bodies on both the front and back sides. The magnet rotor is configured to form a magnetic field in the front and back direction in a disk shape having the rotation shaft at the center,
The coreless winding constitutes a pair of front and back coil bodies arranged to face each other so as to sandwich the disk-shaped magnetic pole from the front and back directions,
The front and back coil bodies composed of the plurality of windings are configured so that the inductance values are substantially different,
2. The generator according to claim 1, wherein the switching unit selectively changes one of front and back coil bodies to the three-phase output terminal to vary the inductance value. A drive rotating shaft that rotates with external force such as wind and hydraulic power,
A magnet rotor coupled to the input rotation shaft;
A stator coil disposed opposite to the magnetic pole of the magnet rotor;
Consisting of
The power generation system according to claim 1, wherein the magnet rotor and the stator coil have the configuration according to claim 1. The magnet rotor is configured to form a magnetic field in the front and back direction in a disk shape having the rotation shaft at the center,
The plurality of coreless windings constitute a pair of front and back coil bodies that are disposed so as to sandwich the disk-shaped magnetic pole from the front and back directions,
The pair of front and back coil bodies are connected to the three-phase output terminal, and the three-phase output terminal is provided with control means for short-circuiting the output of each coil body,
6. The power generation system according to claim 5, wherein the control means causes an electric brake to act on the magnet rotor from the front and back surfaces when the drive rotation shaft is overloaded.

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