JP2011112013A - Wind power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable and efficient wind power generator which improves brake responsiveness and is rotatable even at low wind speed. <P>SOLUTION: A generator is constructed by arranging a power-generating annular permanent magnet 4 on a rotor 1, and arranging a generator coil 3 oppositely to the power-generating annular permanent magnet 4 on a pillar 2 in the radial direction of the rotor 1. The electrical energy generated by the generator is received by a control circuit 11. A ring 6 is arranged oppositely to an electromagnet 5 in the radial direction of the rotor 1. Upon rotation of the rotor 1, the polarity of a magnetic pole crossing the ring 6 changes and hence an eddy current is generated, thereby braking the rotation of the rotor 1. The generated current or generated energy is measured on the control circuit 11. An increase in the rotational frequency of the rotor 1 is suppressed by passing no current through the electromagnet 5 when the measured value indicates the low wind speed, and by passing a large current through the electromagnet 5 when it indicates a high wind speed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vertical axis wind power generator that converts rotational energy generated by wind power into electric energy, and in particular, has a configuration capable of generating power stably and efficiently in response to wind power that changes depending on weather conditions. The present invention relates to a wind power generator.

  In a conventional wind power generator, the brake shaft is operated outward so that the rotation of the rotary shaft provided with the blades does not exceed a predetermined rotational speed due to the increase in wind speed. Attaching multiple arms, the arms are opened by the centrifugal force accompanying the rotation of the rotating shaft, and the magnet rotates with an appropriate gap between the inner peripheral surface of the fixed cylinder and generates eddy current resistance (For example, refer patent document 1).

  FIG. 7 is a configuration diagram of a conventional wind power generator described in Patent Document 1. In FIG.

  In FIG. 7, 101 is a monument windmill, 102 is a table, 103 is a rotation shaft, and 104 is a generator. The monument windmill 101 can rotate around the shaft 103. The monument windmill 101 is made of an aluminum alloy to reduce its weight, is supported by a rotating shaft 103 provided at the center, and stands upright on a table 102. When the wind hits the monument windmill 101, the monument windmill 101 rotates about the rotation shaft 103, and this rotation causes the generator 104 accommodated in the table 102 to generate power.

  The monument windmill 101 has a shape that increases the wind receiving efficiency. The monument windmill 101 is made of an aluminum alloy and light in weight. However, a magnet thrust bearing device 105 is used so that the friction of the thrust load supporting the rotating shaft 103 does not adversely affect the rotation of the monument windmill 101. is doing.

  In the magnet thrust bearing device 105, a rotating body is attached to a rotating shaft 103, a rotating part permanent magnet is provided on the lower end surface of the rotating body, and a fixed part permanent magnet is disposed on the base 102 side, and fixed to the rotating part permanent magnet. The permanent magnets are arranged so as to face each other in the vertical direction, and the rotating body can be levitated by the repulsive force of both permanent magnets.

  A large gear 106 is attached to the rotary shaft 103 as a speed increasing device, a small gear 107 is provided on the output shaft of the generator 104, and a timing belt 108 is wound between the two gears 106 and 107. The small gear 107 can rotate the generator 104 at a high speed, but a coupling (not shown) is interposed, and the generator 104 is turned when the rotational speed of the small gear 107 exceeds a predetermined value. I am doing so. As the generator 104, a three-phase AC generator is used.

  By the way, the wind speed may reach 30 m / s to 40 m / s during a typhoon, and the rotational speed of the monument windmill 101 is very high and dangerous. By providing this, control is performed so as not to exceed a predetermined speed.

  A magnet thrust bearing device 105 and a parasol-type centrifugal magnet brake device 109 are attached to the rotating shaft 103, and the boom 110 made of a nonmagnetic metal capable of adjusting the length is radially formed with respect to the rotating shaft 103. It is attached. At the tip of the boom 110, there are provided arms 111, 111,... Constituting a parallelogram joint made of a non-magnetic metal, which can be opened by the action of centrifugal force when the rotary shaft 103 rotates. . A magnetic metal yoke 112 is provided at the tip of each arm 111, and a strong magnet 113 is attached to the yoke 112.

  When the rotating shaft 103 rotates and the arm 111 is opened by the action of centrifugal force, the arm 111 constitutes a parallelogram joint. Therefore, the surface of the magnet 113 always moves in a vertical state, and the fixed cylinder 114 is moved. Approaching the inner peripheral surface. The fixed cylinder 114 is made of a nonmagnetic metal such as a copper alloy or an aluminum alloy, and is fixed to the table 102. Further, the opening degree of the arm 111 is restricted by a stopper 115 so that the magnet 113 at the tip of the arm 11 does not contact the inner peripheral surface of the fixed cylinder 114 even when the arm 111 is opened.

  In the above configuration, when the magnet 113 rotates with an appropriate gap between the inner periphery of the fixed cylinder 114, an eddy current resistance is generated, and a torque that suppresses the rotation of the rotating shaft 103 acts. When the rotation speed of the rotating shaft 103 increases and the gap between the magnet 113 and the inner peripheral surface of the fixed cylinder becomes smaller due to the action of centrifugal force, the eddy current resistance increases and a large brake is applied to the rotating shaft 103. Works so as not to exceed a predetermined rotational speed.

Japanese Patent No. 4009888

  By the way, strong winds represented by typhoons do not continue at a constant wind speed, and weak winds / strong winds are generated at random, and the responsiveness of the brakes becomes a problem in a wind turbine generator. However, the conventional brake mechanism has a mechanical structure, and sufficient response cannot be obtained. Therefore, when a weak wind / strong wind occurs at random, it may exceed a predetermined number of revolutions, sometimes resulting in damage to the device. There was a thing that I did.

  In addition, in the wind power generation device, it is required to start rotating smoothly and stably even at a low wind speed. However, in the conventional device, members such as a boom, an arm, and a permanent magnet are attached to the rotation shaft. As a result, the weight of the entire rotating shaft is increased, which increases the power load on the windmill, which makes it difficult to rotate at low wind speeds.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a stable and efficient wind power generator that improves the response of a brake and can rotate even at a low wind speed.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a cylindrical rotating body that rotates concentrically around a support column installed in the vertical direction is provided on the outside of the support column. In the wind power generator provided with the blade body that receives the wind force and the generator that extracts the wind force received by the blade body as electric energy, the electromagnet provided in the column and the cylindrical rotating body with respect to the electromagnet A magnetic path is formed by a conductor installed opposite to the radial direction of the cylindrical rotating body, and wind power is generated by eddy current generated by receiving the generated power of the generator and energizing the electromagnet. By providing a control means for decelerating the rotational speed of the cylindrical rotating body when it becomes larger, it is possible to make the brake function electromagnetically according to the level of wind force, and to quickly change the wind force of the weak wind / strong wind Meet It becomes possible.

  The invention according to claim 2 relates to wind power in the wind power generator according to claim 1 by controlling the amount of current to the electromagnet according to the magnitude of electric energy or current generated by the generator. By making the brake function electromagnetically according to the amount of power generated, a quick response to changes in wind power can be made accurately and reliably.

  The invention according to claim 3 is the wind power generator according to claim 1, comprising sensing means for monitoring the wind speed, and controlling the amount of current to the electromagnet according to the wind speed information obtained from the sensing means, By making the brake function electromagnetically based on direct air volume detection, it is possible to respond more quickly and more accurately to wind power changes.

  According to a fourth aspect of the present invention, in the wind turbine generator according to any one of the first to third aspects, an eddy current is generated by generating a change in magnetic flux in the conductor by applying an AC wave to the electromagnet. It is characterized by that.

  A fifth aspect of the present invention is the wind turbine generator according to any one of the first to fourth aspects of the present invention, wherein the thrust magnetism generates a magnetic force by a radial bearing that supports the cylindrical rotating body and a permanent magnet provided on the support column. By having a suction type thrust magnetic bearing composed of a bearing stator and a thrust magnetic bearing rotor installed in the cylindrical rotating body opposite to the thrust magnetic bearing stator in the radial direction of the cylindrical rotating body, The rotating body can be lifted in a non-contact manner in the thrust direction, and can be rotated with a slight wind.

  According to a sixth aspect of the present invention, in the wind turbine generator according to any one of the first to fifth aspects, the permanent magnet provided on the support and the permanent magnet in the radial direction of the cylindrical rotating body. A radial magnetic damper that suppresses the vibration of the cylindrical rotating body by generating eddy currents in the conductive body, and generating a radial magnetic damper in the cylindrical rotating body. Directional vibration can be damped.

  According to a seventh aspect of the present invention, in the wind turbine generator according to any one of the first to sixth aspects, a magnetic pole is provided on the thrust magnetic bearing stator so as to oppose the thrust direction of the thrust magnetic bearing rotor. A thrust magnetic damper that suppresses vibration in the thrust direction of the cylindrical rotating body is configured by installing a conductor in the thrust magnetic bearing rotor portion that opposes the thrust direction, so that the thrust direction generated in the cylindrical rotating body can be reduced. Vibration can be damped.

  According to the wind power generator of the present invention, even during strong winds, the blades can be stably rotated so that the generated power can be used for braking and the rated output can be achieved without stopping the rotation. In addition, it is possible to provide a wind power generator with good power generation efficiency that can be rotated smoothly and stably even in a light wind.

Sectional drawing which shows the structure in Embodiment 1 of the wind power generator of this invention Explanatory drawing which shows the planar structure of the heteropolar type electromagnet in this embodiment Explanatory drawing which shows the cross-section of the homopolar type electromagnet in this embodiment Sectional drawing which shows the structure of Embodiment 4 of the wind power generator of this invention Sectional drawing which shows the structure of Embodiment 5 of the wind power generator of this invention Sectional drawing which shows the structure of Embodiment 6 of the wind power generator of this invention Configuration diagram of conventional wind turbine generator

  Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the structure of Embodiment 1 of the wind turbine generator of the present invention.

  In FIG. 1, 1 is a rotating body, 2 is a support, 3 is a power generation coil, 4 is an annular permanent magnet for power generation, 5 is an electromagnet, 6 is a ring, 7 is a thrust bearing stator, 8 is a permanent magnet, and 9 is a thrust bearing rotor. Reference numeral 10 denotes a radial bearing, 11 denotes a control circuit, 12 denotes an amplifier, 15 denotes a mounting member, and 16 denotes a blade body.

  As shown in FIG. 1, the rotating body 1 is arranged in the vertical direction, and a plurality of blade bodies 16 as wind receiving means are attached to the periphery. For example, a Savonius windmill, a Darrieus windmill, a cross flow windmill, a cup type windmill, or the like is used as the blade body 16 that receives wind power and changes the rotational force. These vertical axis type wind turbines are characterized in that an azimuth control device that tracks the rotation surface of the wind turbine rotor in the wind direction is unnecessary.

  A support column 2 is provided in the vertical direction inside the rotating body 1. The rotation center axes of the rotating body 1 and the support column 2 are the same. The rotating body 1 is provided with a power generation annular permanent magnet 4, and further, a power generation coil 3, which is a means for extracting generated power, is arranged on the support 2 in the radial direction of the rotation body 1 so as to face the power generation annular permanent magnet 4. The generator is made up of. Specifically, a structure of a three-phase AC generator that outputs three-phase AC can be employed.

  Electric energy generated by the generator is received by the control circuit 11. In the control circuit 11, for example, a direct current can be output using a diode bridge, and supplied as a 100 V alternating current through DC / AC conversion and boosting. In addition, the control circuit 11 may be provided with an AC / DC converter or a storage battery that accumulates the generated electric energy so that AC power can be extracted as DC power.

  The ring-shaped permanent magnet for power generation 4 and the power generation coil 3 may be arranged at any position in the vertical direction of the rotating body 1.

  A heteropolar electromagnet 5 is disposed on the support 2. FIG. 2 is an explanatory view showing a planar structure of the heteropolar electromagnet 5.

  In FIG. 2, an electric current is applied to the electromagnet coil 14 constituting the electromagnet 5 to generate N pole / S pole in the magnetic pole 13. By disposing the ring 6 opposite to the electromagnet coil 14 in the radial direction of the rotating body 1 and generating the eddy current by changing the polarity of the magnetic pole crossing the ring 6 by the rotation of the rotating body 1, The rotation of the rotating body 1 is braked.

  The ring 6 is made of a material that easily generates eddy current, such as aluminum or copper. Since the magnitude of the eddy current is proportional to the square of the fluctuation frequency of the magnetic field, the larger the change of the N pole and the S pole (the higher the fluctuation frequency), the larger the eddy current. Since the magnitude of the eddy current is proportional to the square of the magnetic flux density, the smaller the gap between the ring 6 and the magnetic pole 13 and the larger the current flowing through the electromagnet coil 14, the larger the eddy current.

  Therefore, a plurality of electromagnets 5 are installed according to the magnitude of the braking force required as a brake for the rotating body 1. Further, in consideration of the uniformity of the braking force applied to the rotating body 1, it is desirable to arrange an even number symmetrically with respect to the rotation center axis, and to arrange the N pole / S pole alternately. The electromagnet 5 may be connected by connecting a plurality of electromagnets in series, or may be driven by separate circuits.

  The electromagnet 5 and the ring 6 may be arranged at any position in the vertical direction of the rotating shaft of the rotating body 1.

  Usually, a generator having a rated output is used as the generator. The wind power generator starts power generation when the wind speed increases and reaches a cut-in wind speed (minimum wind speed necessary for power generation). It is desirable that the cut-in wind speed is low. From cut-in wind speed to rated wind speed, operation is performed to obtain the maximum output by pitch control. When the rated wind speed is exceeded (cutout wind speed), the generator capacity is insufficient, so operation is performed to keep the output at the rated value.

  However, when the wind speed increases due to strong winds or gusts, the operating design strength of a structure such as a rotating member or bearing is reached, or the cutout wind speed at which the generator output voltage rises abnormally is reached. Stop rotating the wind turbine.

  The rated wind speed varies greatly depending on whether it is a strong wind area or a weak wind area, and an optimum rated wind speed is set. In the generator, the output is zero below the cut-in wind speed, the output is constant at the rated value from the rated wind speed to the cut-out wind speed, and the apparatus stops and the output is zero above the cut-out wind speed.

  In the control circuit 11, the generated current or the generated power is measured, and the current is supplied from the amplifier 12 to the electromagnet 5 according to the measured amount. When the wind force is small enough not to activate the brake, no current is passed through the electromagnet 5. In addition, if the wind power is large, such as a typhoon, it may be damaged by a large centrifugal force due to excessive rotation speed, so by generating a large current, a large brake is applied to increase the rotation speed. suppress.

  Further, in the present embodiment, even when the fluctuation of the wind force is severe, the responsiveness is fast due to the electromagnetic brake structure, and the brake can be applied instantaneously. In addition, by controlling the braking force, it is possible to stably maintain an appropriate rotational speed. As a result, even if a situation occurs where the rotation exceeds the cut-out wind speed and the rotation is stopped, the appropriate rotational speed can be maintained by controlling the brake structure using the power generated by the generator. Can do. Therefore, since it is possible not to stop the power generation, it is possible to realize a wind power generator with high power generation efficiency.

  A contact-type radial bearing 10 is used to support the rotating body 1 in the radial direction. As the radial bearing 10, for example, a rolling bearing is used.

  The factor that hinders the rotation of the rotating body 1 in the rotation with the light wind is the weight of the rotating body 1 acting in the thrust direction. For example, when a contact-type bearing is used as a bearing in the thrust direction, the rotation is caused by rotational friction. Directional resistance. Since the rotational frictional resistance in the radial direction is smaller than this resistance, the contact-type radial bearing 10 can be used in the radial direction. The radial bearing 10 is fixed to the column 2 via the attachment member 15.

  In the thrust direction support, an annular permanent magnet 8 and an annular thrust bearing stator 7 are provided on the support 2, and a thrust bearing rotor 9 is disposed opposite to the thrust bearing stator 7 in the radial direction of the rotating body 1. The bearing structure is as follows.

  The permanent magnet 8 has a homopolar configuration in which N poles / S poles (or S poles / N poles) are provided in the vertical direction. In the homopolar type, there is no change in the magnetic poles in the rotating body, so that no eddy current is generated in the rotating body 1 and the rotation loss can be reduced. The permanent magnet 8 has a strong magnetic force and needs to retain the properties as a magnet for a long time. For example, an alnico magnet, a ferrite magnet, a neodymium magnet, or the like is used.

  In FIG. 1, a suction force in the horizontal direction (radial direction) is generated in the air gap between the thrust bearing stator 7 and the thrust bearing rotor 9 that are arranged to face each other. When the rotating body 1 moves in the thrust direction and the magnetic flux in the air gap changes, a restoring force F for returning the thrust bearing rotor 9 to the thrust direction is generated. This restoring force F functions as a bearing in the thrust direction.

  In the present embodiment, since the thrust bearing having the above-described configuration is provided inside the rotating body 1, it can be installed without interference even if the horizontal positional relationship of the blade body 16 and the radial bearing 10 is the same. Has a high degree of freedom. In addition, the entire axial length of the wind turbine generator can be shortened.

  The number of thrust bearings can be increased or decreased according to the weight balance position (center of gravity position) in the rotating body 1. Further, the thrust bearing can be disposed at an appropriate position. For example, the thrust bearing may be installed above the upper end in the vertical direction of the blade body 16 or below the lower end in the vertical direction of the blade body 16. .

  Also, a protective bearing (not shown) may be attached to prevent the rotating body 1 from being subjected to an abnormal load exceeding the bearing rigidity and contacting the rotating body 1 and the member attached to the support 2. Good.

  By supporting the rotating body 1 in a non-contact manner with such a non-contact type thrust bearing, there is no rotational friction in the thrust direction, and smooth and stable rotation is possible even in light winds.

(Embodiment 2)
As a second embodiment of the wind turbine generator of the present invention, in the configuration of the first embodiment, the support 2 is provided with a sensing mechanism for monitoring the wind speed (not shown), and the electromagnet 5 is provided based on the wind speed signal from the sensing mechanism. A configuration for determining the current to flow can be employed.

  As the sensing mechanism, it is necessary to sense the wind speed with high responsiveness. For example, a cup-type anemometer can be used. A cup-type anemometer has a vertical-axis windmill-type sensitive part having three or four hemispherical or conical shells of a wing around a vertical rotation axis. When the wind hits the cup, the concave surface has more air resistance than the convex surface, so the shaft rotates in the direction in which the concave surface is pushed. The cup-type anemometer is configured to detect the rotation using a gear mechanism, a generator, a photoelectric counter, etc., convert it into a numerical value or an electric signal, and output it to obtain a measured value. .

  In the second embodiment, when the wind force is large, the braking operation based on the signal of the sensing mechanism can sense faster than the power generation signal due to the rotation of the blade body 16 in FIG. It becomes possible to rotate. Other configurations are the same as those of the first embodiment.

  In the first embodiment, when the rotating body 1 is suddenly subjected to a large load during a gust of wind, using the result of measuring the generated current or the generated power, the timing of applying the brake is slow, and the structure such as a rotating member and a bearing May damage.

  However, in the second embodiment, even in a gust of wind that exceeds the cut-out wind speed and further requires a wind speed detection speed, it is possible to maintain an appropriate rotation speed by controlling the brake using generated power, Since the power generation is not stopped, a wind power generator with high power generation efficiency can be realized.

(Embodiment 3)
As a third embodiment of the wind turbine generator of the present invention, the vortex generated in the ring 6 by electrically changing the magnetic flux of the magnetic path by applying an AC waveform to the current from the amplifier 12 to the electromagnet 5 shown in FIG. A configuration for increasing the current can be employed.

  In this case, the electromagnet 5 may be a heteropolar type as shown in FIG. 2 or a homopolar type as shown in FIG. In the case of the heteropolar type, an AC waveform is superimposed on the DC current, and a larger braking force can be generated compared to a case where the AC waveform is not superimposed.

  In addition, as shown in FIG. 3, the homopolar type has N poles and S poles formed in the axial direction. Therefore, since the magnetic pole does not change in the ring 6 due to the rotation, it is necessary to electrically change the N pole and the S pole of the electromagnet 5, and by applying an alternating current having an amplitude of ± (plus or minus). Generate eddy currents.

  In addition, since the other structure is the same as that of Embodiment 1, the same code | symbol is attached | subjected to a corresponding member and detailed description is abbreviate | omitted.

(Embodiment 4)
FIG. 4 is a cross-sectional view showing a configuration of Embodiment 4 of the wind turbine generator of the present invention.

  As shown in FIG. 4, an annular permanent magnet 22 and an annular radial damper magnetic pole 21 are provided on the support 2, and an air gap is provided in the radial direction of the rotating body 1 with respect to the radial damper magnetic pole 21 to A radial damper ring 23 is disposed opposite to the radial damper ring 23.

  As the permanent magnet 22, a homopolar type in which N pole / S pole (or S pole / N pole) is provided in the vertical direction is used. In the homopolar type, there is no change in the magnetic pole due to the rotation of the rotating body 1, so that no eddy current is generated in the rotating body 1 and the rotation loss can be reduced. The permanent magnet 22 has the same strong magnetic force as that used for the thrust bearing and needs to retain the properties as a magnet for a long period of time. For example, an alnico magnet, a ferrite magnet, or a neodymium magnet is used. The radial damper 23 is made of a material that easily generates eddy current such as aluminum or copper.

  When the air gap between the radial damper magnetic pole 22 and the radial damper ring 23 arranged opposite to each other changes due to vibration or the like, an eddy current is generated in the radial damper ring 23 to produce a damping effect and suppress vibration in the radial direction. be able to. Since the radial direction is supported by the contact-type radial bearing 10, the gap changes in the radial direction according to the backlash of the radial bearing 10 and the amount of deflection of the rotating body 1.

  Since other configurations are the same as those of the first embodiment, the corresponding members are denoted by the same reference numerals, and detailed description thereof is omitted.

  With the configuration of the fourth embodiment, when a variable load is generated in the rotating body 1 due to a change in wind speed, vibration of the rotating body 1 can be suppressed and the rotational accuracy of the rotating body 1 can be improved. Loss is reduced and power generation efficiency can be improved. Moreover, since the vibration transmitted from the support | pillar 2 can be reduced, the influence which it has on the surrounding environment can be reduced.

(Embodiment 5)
FIG. 5 is a cross-sectional view showing a configuration of a fifth embodiment of the wind turbine generator of the present invention.

  As shown in FIG. 5, the thrust magnetic bearing stator 7 is provided with an annular thrust damper 25 opposed to the thrust magnetic bearing rotor 9 in the thrust direction, and opposed to the thrust damper 25 with an air gap in the thrust direction. The thrust magnetic bearing rotor 9 is provided with an annular conductor thrust damper ring 24. The thrust damper ring 24 is made of a material that easily generates eddy current such as aluminum or copper.

  For this reason, when the gap in the thrust direction between the thrust damper 25 and the thrust damper ring 24 arranged opposite to each other changes due to vibration or the like, an eddy current is generated in the thrust damper ring 24 and a damping effect is generated. Directional vibration can be suppressed.

  Since other configurations are the same as those of the first embodiment, the corresponding members are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, in the fifth embodiment, when a variable load is generated in the rotating body 1 due to a change in wind speed, vibration of the rotating body 1 can be suppressed and the rotation accuracy of the rotating body 1 can be improved. Friction loss is reduced and power generation efficiency can be improved. Moreover, the vibration transmitted from the support | pillar 2 can be reduced and the influence which it has on the surrounding environment can be reduced.

(Embodiment 6)
FIG. 6 is a cross-sectional view showing the configuration of Embodiment 6 of the wind turbine generator of the present invention.

  In the configurations of the first to fifth embodiments, the radial bearing 10 is installed outside the rotating body 1 and the rotating body 1 is supported in the radial direction from the outside. However, in the sixth embodiment, as shown in FIG. A radial bearing 10 is arranged inside the rotating body 1.

  Further, in the configurations of the first to fifth embodiments, the brake mechanism, the thrust magnetic bearing, the radial damper, and the thrust damper are disposed inside the rotating body 1 as illustrated, but in the sixth embodiment, as illustrated in FIG. The electromagnet 5, the thrust magnetic bearing stator 7, the radial damper magnetic pole 23, the permanent magnets 8 and 22, and the radial bearing 10 are fixed to the column 2 via the mounting member 15. I have to.

  Further, the arrangement and order of the thrust magnetic bearing, the brake mechanism, the radial damper, the thrust damper, and the like described above, and the installation on the inner side and the outer side of the rotating body 1 are not limited to the structure of the present embodiment. It will be arranged appropriately according to the specifications and configuration.

  In any of the embodiments, since the wind turbine generator is installed outdoors, water and dust do not enter the magnetic circuit and the electric circuit. In addition, when there is an electromagnetic influence on the outside, an electromagnetic shield is provided so as not to leak magnetic flux.

  The present invention is effective when applied to a structure of a wind power generator that is applied to a brake mechanism of a wind power generator and in which a load applied to a rotating body varies. Further, it can be applied to a turbine for power generation. Further, since the thrust magnetic bearing mechanism can shorten the rotating body, it is also applied to a mechanism that supports a high-speed rotating body.

DESCRIPTION OF SYMBOLS 1 Rotating body 2 Support | pillar 3 Power generation coil 4 Annular permanent magnet for power generation 5 Electromagnet 6 Ring (conductor)
7 Thrust bearing stator 8 Permanent magnet 9 Thrust bearing rotor 10 Radial bearing 11 Control circuit 12 Amplifier 13 Magnetic pole 14 Electromagnetic coil 15 Mounting member 16 Blade 21 Radial damper 22 Permanent magnet 23 Radial damper ring (conductor)
24 Thrust damper ring (conductor)
25 Thrust damper magnetic pole

Claims (7)

A cylindrical rotating body that rotates concentrically around a column installed in the vertical direction is provided around the column, and a blade body that receives wind force and wind force received by the blade body are provided on the cylindrical rotating body. In the wind power generator provided with a generator to be taken out as electric energy,
A magnetic path is formed by the electromagnet provided on the support and a conductor installed on the cylindrical rotating body facing the electromagnet in a radial direction of the cylindrical rotating body,
Control means for decelerating the rotational speed of the cylindrical rotating body when wind power increases due to an eddy current generated by energizing the electromagnet with the power generated by the generator. Wind power generator.   The wind power generator according to claim 1, wherein an amount of current to the electromagnet is controlled according to a magnitude of electric energy or a current generated by the generator.   The wind power generator according to claim 1, wherein a sensing means for monitoring the wind speed is provided, and an amount of current to the electromagnet is controlled by wind speed information obtained from the sensing means.   The wind power generator according to any one of claims 1 to 3, wherein an eddy current is generated by generating a change in magnetic flux in the conductor by applying an AC wave to the electromagnet.   A radial bearing that supports the cylindrical rotating body, a thrust magnetic bearing stator that generates a magnetic force by a permanent magnet provided on the support, and the cylindrical rotating body with respect to the thrust magnetic bearing stator in the cylindrical rotating body 5. The wind power generator according to claim 1, further comprising an attraction-type thrust magnetic bearing configured by a thrust magnetic bearing rotor disposed so as to be opposed to each other in a radial direction.   The permanent magnet provided on the support column, and a conductor installed on the cylindrical rotating body facing the permanent magnet in a radial direction of the cylindrical rotating body, and generating an eddy current in the conductor The wind turbine generator according to any one of claims 1 to 5, wherein a radial magnetic damper is configured to suppress vibration of the cylindrical rotating body.   A magnetic pole is provided on the thrust magnetic bearing stator so as to oppose the thrust direction of the thrust magnetic bearing rotor, and a conductor is installed on the thrust magnetic bearing rotor portion facing the magnetic pole in the thrust direction, whereby the cylindrical shape is provided. The wind turbine generator according to any one of claims 1 to 6, wherein a thrust magnetic damper is provided that suppresses vibration of the rotating body in a thrust direction.

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