KR20130030466A - Windmill - Google Patents

Abstract

PURPOSE: An aerogenerator is provided to cool a nacelle section with natural convection circulation of air according to the differences in atmospheric pressures between an air inlet and outlet unit. CONSTITUTION: An aerogenerator comprises a nacelle cover(130) and a nacelle cooling unit. The nacelle cover generates power through a rotary motion of a blade(103) rotated by wind and includes a nacelle generating electric power. A tower(101) includes a plurality of cables connected to the nacelle and supports the axial weight of the nacelle cover by connecting the nacelle cover in an upper end. The nacelle cooling unit comprises an air inlet unit(141) located in a lower part of the tower and an air outlet unit located in one side of the nacelle cover. The nacelle cooling unit cools a nacelle section with natural convection circulation of air according to the differences in atmospheric pressures between the air inlet and outlet unit.

Description

Wind Power Generators {WINDMILL}

The present invention relates to a wind power generator, and more particularly, to a wind power generator capable of cooling a nacelle region.

Wind power generators (or wind turbines) are devices that produce electrical energy from wind-driven blades, and their weight is increasing due to depletion of fossil fuels and environmental issues.

Such a wind power generator has a structure in which a plurality of blades rotated by wind are connected to a rotor and coupled to a nacelle cover.

A nacelle is provided inside the nacelle cover. The nacelle receives the rotational movement of the rotor connected to the blades to generate power and produce electrical energy, such as mechanical parts that play an important role in driving the wind turbine, such as the main shaft and gearbox. It refers to a structure in which mechanical parts such as a gear box and a generator are structurally combined.

On the other hand, since the nacelle cover is inside the nacelle cover, many mechanical parts are mounted, so it is necessary to cool the nacelle area by releasing heat generated from the nacelle.

For example, Korean Patent Application Publication No. 10-2011-0031334 (Prior Document 1) proposes a technique in which a separate airflow forming apparatus for forming airflow is mounted in a nacelle area, and Korea Patent Office Registration No. 10-1030588 Prior Art 2 proposes a technique in which a separate cooling device is provided in a nacelle region.

However, in the case of the prior art known to date, including the above-mentioned prior documents, cooling of the nacelle area is additionally performed by additionally installing a separate part or device having a complicated or expensive structure such as an airflow forming device or a cooling device. There is a problem in that additional costs and efforts are incurred in installing and managing such devices.

Prior Document 1; Korean Patent Office Publication No. 10-2011-0031334 Prior Document 2; Korea Patent Office Registration No. 10-1030588

Therefore, the technical problem to be achieved by the present invention is to provide a wind power generator capable of simply and efficiently cooling a nacelle region through natural convection circulation of air.

According to one aspect of the invention, the nacelle cover (nacelle cover) is a built-in nacelle (nacelle) for generating electric energy by generating power through the rotational movement of the blade (blade) rotated by the wind; A plurality of cables connected to the nacelle are disposed therein, a lower end supported on the ground and an upper end connected to the nacelle cover to support an axial load of the nacelle cover; And an air inlet provided in the lower region of the tower, and an air exhaust provided on one side of the nacelle cover, and by the natural convection circulation of air according to the air pressure difference between the air inlet and the air exhaust. A wind power generator including a nacelle cooling unit for cooling the nacelle region may be provided.

The air inlet may be provided in a tower door disposed in a lower region of the tower to form an access passage into the tower, and the air outlet may be provided on a rear surface of the nacelle cover. Each louver module may be coupled to the discharge unit.

The louver module may include a closed loop module frame forming an outer frame of the front surface; A plurality of louvers disposed in the module frame; And detachably coupled to one side of the module frame, it may include at least one filter for filtering foreign matter in the air circulated.

The at least one filter may include first and second filters for different functions for filtering, and the louver module may include a first filter disposed on a rear surface of the module frame and the first filter slidingly inserted. A first filter support having a filter slot; And a second filter support part connected to a rear surface of the first filter support part such that a second filter slot into which the second filter is slidingly inserted is formed between the first filter support part.

The tower may be provided with at least one platform disposed along a direction crossing the longitudinal direction of the tower to form a foothold of the operator, and the platform may rotatably support the plurality of cables. The cable rotation support may be further coupled.

The cable rotation support unit, a fixed holder fixed to the platform; And a rotating body disposed in the radially inner side of the fixed holder and having the plurality of cables passed therein, and formed at an upper end of the rotating body and larger than a diameter of the rotating body and disposed at the upper end of the fixed holder. It may include a rotation holder having a branch.

A bearing may be provided between the fixed holder and the rotary holder.

The inner space of the rotary holder may be sealed compounded so that the plurality of cables are disposed inside the rotary holder such that the rotary holder and the cable form a body.

A platform door provided on the platform to open and close the opening of the platform; A door driver connected to the platform door to drive the platform door; A fire detector provided inside the nacelle cover to detect a fire in the nacelle area; And a controller for controlling the operation of the door driver based on the detection signal of the fire detector.

The fire detection unit, a smoke detection module for detecting smoke when a fire occurs; And it may include a heat detection module for detecting heat in the event of fire.

Embodiments of the present invention can cool the nacelle region simply and efficiently through the natural convection circulation of air.

1 is a side structural diagram of a wind power generator according to a first embodiment of the present invention.
2 is a structural diagram of a nacelle cover region.
3 is a perspective view of the louver module.
FIG. 4 is a schematic enlarged projection view of area A of FIG. 1 showing a platform area. FIG.
5 is a cross-sectional structural view of the cable rotation support region.
6 is a perspective view showing the operation of the platform door and the door driver.
7 is a control block diagram of a wind turbine.
8 is a perspective view showing the operation of the platform door and the door driving unit in the wind power generator according to the second embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a side structural view of a wind power generator according to a first embodiment of the present invention, FIG. 2 is a structural diagram of a nacelle cover region, and FIG. 3 is a perspective view of a louver module.

Referring to these drawings, the wind power generator according to the present embodiment includes a tower 101, a plurality of blades 103 rotated by wind, and a rotor 110 to which a plurality of blades 103 are connected. And a nacelle (nacelle, not shown) that generates electric power by receiving the rotational movement of the rotor 110 and generates electric power, and a nacelle cover 130 that is coupled to the outside of the nacelle to protect the nacelle. And a nacelle cooling unit (not shown) for cooling the nacelle region by a natural convection circulation of air according to the air pressure difference.

As shown in FIG. 1, the tower 101 is a shaft disposed vertically and long to support axial loads of the blades 103, the rotor 110, the nacelle and the nacelle cover 130, and the like.

The tower 101 may be divided into a lower tower at a lower portion and an upper tower at an upper portion by position. In the present embodiment, since the nacelle region is cooled by the natural convection circulation of the air according to the pressure difference, the higher the height of the tower 101 is, the larger the pressure difference can be obtained, and thus the air circulation can be more advantageous. In the present embodiment, the tower 101 having a length of 100 meters (m) is applied, but the scope of the present invention is not limited to the numerical value thereof.

The blade 103 is a kind of wing that rotates by wind to generate a rotational motion. It may have a streamlined wing shape to be easily rotated by the wind, two or more may be applied. Three blades 103 are applied to the wind power generator of this embodiment, but the scope of the present invention is not limited by the number thereof.

The rotor 110 is a place where a plurality of blades 103 are connected. When viewed from the front, the rotor 110 has a substantially circular shape. The part to which the blade 103 is connected is also called a hub, and here the names of the hubs will be collectively referred to as the rotor 110 without distinction. Since the blade 103 is connected to the rotor 110, the rotor 110 is co-rotated with the blade 103.

As mentioned earlier, the nacelle is a mechanical component that plays an important role in driving the wind power generator, such as generating electric power by receiving the rotational movement of the rotor 110 connected to the blade 103 to produce electric energy. For example, the name refers to a structure in which mechanical parts such as a main shaft 120 (main shaft (see FIG. 2)), a gear box (not shown) and a generator (not shown) are structurally coupled.

These mechanical parts are connected to each other, the drawings of this embodiment are not shown for the mechanical parts constituting the nacelle except for the main shaft 120 for convenience.

The main shaft 120, which is a mechanical component of the nacelle, is a portion directly receiving the rotational movement of the blade 103. A rotor lock disk 125 is connected to the head region of the main shaft 120.

The rotor lock disk 125 having a donut shape has a radial direction from the outside of the head portion 121 (see FIG. 2) of the main shaft 120, that is, the head portion 121 of the main shaft 120 facing the rotor 110. It is coupled to extend outward to support the head portion 121 of the main shaft 120 to the nacelle cover 130.

The nacelle cover 130 is coupled to the outside of the nacelle serves to protect the nacelle. Since the nacelle cover 130 is exposed to the outside air as it is, it is always exposed to snow, rain or sunlight, so that some degree of rigidity must be ensured. Therefore, the nacelle cover 130 may be made of a plastic or metal composite material having excellent durability.

The nacelle cover 130 is a box-shaped assembly structure. The left cover 131 coupled to one side of the main shaft 120 and the left cover 131 with the main shaft 120 interposed therebetween. A top cover 132 coupled to the main shaft 120 symmetrically to the upper cover 133, and a top cover 133 surrounding the nacelle together with the left cover 131 and the right cover 132. The lower cover (not shown) coupled to the lower side of the left cover 131 and the right cover 132 has a hole (H, Hole) is inserted into the tower 101.

Although not shown, since the nacelle cover 130 is a component assembled adjacent to the rotor 110, a gap (not shown) due to an assembly tolerance may be generated between the rotor 110 and the nacelle cover 130. A rain protector (not shown) is provided on the nacelle cover 130 in the rotor 110 region to prevent water, rain, or the like, from damaging the nacelle through the gap. The rain protector may be a ring-type structure that can be easily fitted and prevents water or snow from entering the nacelle at the corresponding position.

Meanwhile, a nacelle cooling unit (not shown) cools the nacelle region by a natural convection circulation of air according to a pressure difference, and as shown in FIG. 1, an air inlet 141 provided in a lower region of the tower 101. And an air discharge part 142 provided in the nacelle cover 130 as shown in FIG. 2.

As described above, considering that the tower 101 is a giant structure, for example, about 100 meters (m), an air inlet 141 is made in the lower region of the tower 101, and a nacelle which is the upper region of the tower 101. When the air discharge part 142 is provided in the cover 130, the air flows into the air inlet 141 by the pressure difference and flows into the tower 101, and then the holes H, 2) may be introduced into the nacelle cover 130 to cool the nacelle, and then discharged to the air discharge part 142.

Since this air circulation can be repeated continuously, it is possible to perform a cooling action for the nacelle region even without a complicated or expensive cooling device as usual.

The air inlet 141 may be provided in the tower door 145 (see FIG. 1) disposed in the lower region of the tower 101 to form an access passage into the tower 101. And the air discharge portion 142 may be provided on the back surface of the nacelle cover 130, as shown by a dotted line in FIG. Of course, this positional limitation is only one embodiment, and the scope of the present embodiment is not limited thereto.

In providing the air inlet 141 and the air outlet 142 on the lower part of the tower 101 and the back of the nacelle cover 130, respectively, the air inlet 141 and the air outlet 142 are simply holes. It may be provided in the form of (open). However, in such a case, there is a high possibility that foreign substances or plants and animals may flow into the tower 101 and the nacelle cover 130.

Therefore, in the present embodiment, while the inflow and outflow of air through the air inlet 141 and the air outlet 142 proceeds naturally, foreign matters or animals and plants are introduced into the tower 101 and the nacelle cover 130. The louver module 150 is provided at the air inlet 141 and the air outlet 142 so as to be prevented.

Since the structure of the louver module 150 provided in the air inlet part 141 and the air exhaust part 142 is the same, the same reference numeral was attached.

As shown in FIG. 3, the louver module 150 includes a closed loop-shaped module frame 151 forming a front outer frame, a plurality of louvers 152 disposed on the module frame 151, and a module frame. It is detachably coupled to one side of the 151, and includes first and second filters 153a and 153b for filtering foreign matter in the circulated air.

As described above, the module frame 151 may be screwed to the rear surface of the tower door 145 or the nacelle cover 130. The module frame 151 supports the louvers 152.

Louver 152 is disposed at a plurality of oblique angles to allow the inflow or exhaust of air, but serves to prevent the introduction of foreign matter. In particular, the louver 152 prevents water such as rain or snow from entering the tower 101 and the nacelle cover 130. In this embodiment, the louver 152 may be a fixed or electric louver.

The first and second filters 153a and 153b are detachably coupled to one side of the module frame 151 to filter foreign matter in the air circulated. In the present embodiment, two first and second filters 153a and 153b which serve different functions are disclosed, but one filter may be applied or three or more different filters may be applied. It may be. For example, various kinds of filters such as a prefilter, a hepa filter, an electrostatic filter, and the like may be applied.

In order to mount the first and second filters 153a and 153b, the module frame 151 is provided with a first filter support 154 and a second filter support 155, respectively.

The first filter support 154 has a first filter slot 154a disposed on the rear surface of the module frame 151 and into which the first filter 153a is slidably inserted. The second filter supporter 155 is connected to the rear surface of the first filter supporter 154 so that a second filter slot 155a is formed between the first filter supporter 154 and the second filter 153b is slidably inserted. do. Due to the structure of the first filter support part 154 and the second filter support part 155, installation and replacement of the first and second filters 153a and 153b may be facilitated.

Figure 4 is a schematic enlarged projection of the area A of Figure 1 showing the platform region, Figure 5 is a cross-sectional structural view of the cable rotation support region, Figure 6 is a perspective view showing the operation of the platform door and the door drive, Figure 7 Is a control block diagram of a wind turbine.

Referring first to FIG. 4, a platform 160 is disposed inside the tower 101 to be disposed along a direction crossing the longitudinal direction of the tower 101 to form a foothold of the operator. Although one platform 160 is illustrated in FIG. 4, a plurality of platforms 160 may be provided in several places along the length direction of the tower 101.

The central area of the platform 160 is provided with a cable rotation support unit 170 for rotatably supporting a plurality of cables (C, cable) connected to the nacelle. The cable (C) may be a bundle bundled by a cable holder (C / H, Cable Holder), not a single line, and the cable rotation support unit 170 is provided to rotatably support the cable (C).

For reference, the blade 103 should be changed in position according to the direction of the wind. To this end, the nacelle cover 130 may be rotated with respect to the tower 101. As such, when the nacelle cover 130 is rotated, the nacelle cover 130 may not be rotatably supported. have. Therefore, in the present embodiment, even if the nacelle cover 130 including the blade 103 is rotated to provide a cable rotation support portion 170 to prevent the cable (C) is twisted while breaking.

As shown in FIG. 5, the cable rotation support unit 170 includes a fixed holder 171 fixed to the platform 160 and a rotation holder 172 relatively rotated with respect to the fixed holder 171.

The rotary holder 172 is disposed in the radially inner side of the fixed holder 171 and is formed at the upper end of the rotary body 172a through which the cable C passes, and the rotary body 172a. It is provided with a flange portion 172b formed larger than the diameter and disposed on the upper end of the fixed holder 171.

In this case, the bearing 173 may be interposed between the fixed holder 171 and the rotary holder 172 to smoothly rotate the rotary holder 172 with respect to the fixed holder 171. The bearing 173 may be applied to anything, such as a ball bearing and a roller bearing.

After the cable C is disposed in the rotary holder 172, the inner space of the rotary holder 172 is treated with a sealing compound 174. Therefore, the cable (C) and the rotary holder 172 forms a body.

Since the cable rotation support unit 170 having such a structure is provided, even if the nacelle cover 130 is rotated, including the diarrhea blade 103, the cable C may be twisted and cut off effectively.

On the other hand, a nacelle region made of mechanical parts may be vulnerable to fire. If a fire occurs in the nacelle region, it is difficult if the natural convection circulation of air continues. That is, when a fire occurs in the nacelle area, the natural convection circulation of the air connecting the air inlet 141 and the air outlet 142 should be blocked. To this end, as shown below, the configuration of the platform door 162, the door driver 180, the fire detector 190 and the controller 195 is equipped with the wind power generator of the present embodiment.

Referring to FIG. 4, one side of the platform 160 is provided with a hatch 161, which is a passage for the worker to go up, and a platform door 162 that opens and closes the openings 160a and Open of the platform 160. Prepared. In the present embodiment, both the opening 160a of the platform 160 and the platform door 162 are disc shaped.

As shown in FIG. 6, the platform door 162 is provided with a door driver 180 for driving the platform door 162. In this embodiment, the door driver 180 is applied as a motor directly connected to the platform door 162. As the door driver 180 is operated, the platform door 162 may be driven as a dotted line or a solid line of FIG. 6 to open and close the opening 160a of the platform 160.

Referring to FIG. 7, a fire detector 190 is provided inside the nacelle cover 130 to detect a fire in a nacelle area formed of a mechanical component. The fire detector 190 is connected to a controller 195 that controls the operation of the door driver 180 based on the detection signal of the fire detector 190.

The fire detector 190 detects a fire in the nacelle area. The fire detection unit 190 may include a smoke detection module 191 for detecting smoke when a fire occurs and a heat detection module 192 for detecting heat when a fire occurs. Both the smoke detection module 191 and the heat detection module 192 may be coupled to an inner wall of the nacelle cover 130.

The controller 195 is connected to the fire detection unit 190 including the smoke detection module 191 and the heat detection module 192 to operate the door driver 180 based on the detection signal of the fire detection unit 190. I can control it. For example, when a fire occurs in the nacelle area, when the fire detector 190 transmits a fire occurrence signal to the controller 195, the controller 195 controls the operation of the door driver 180 to control the platform as shown in FIG. 6. The door 162 is arranged to block the natural convection circulation of the air connecting the air inlet 141 and the air outlet 142. This may be advantageous for extinguishing the fire because air is blocked from the nacelle area where the fire occurred.

Such a controller 195 includes a central processing unit 195a (CPU), a memory 195b (MEMORY), and a support circuit 195c (SUPPORT CIRCUIT) as shown in FIG.

The central processing unit 195a may be one of various computer processors that can be industrially applied to control fire suppression in the wind turbine of the present embodiment. The memories 195b and MEMORY are connected to be operated together with the central processing unit 195a. The memory 195b is a computer readable recording medium which can be installed locally or remotely, and is readily available, such as, for example, random access memory (RAM), ROM, floppy disk, hard disk or any digital storage form. At least one or more memories. A support circuit 195c (SUPPORT CIRCUIT) is operatively coupled with the central processing unit 195a to support typical operation of the processor. Such support circuit 195c may include a cache, a power supply, a clock circuit, an input / output circuit, a subsystem, and the like.

For example, in the wind power generator according to the present embodiment, the operation of the door driver 180 is controlled based on a detection signal from the fire detection unit 190 including the smoke detection module 191 and the heat detection module 192. A series of processes and the like may be stored in the memory 195b. Typically software routines may be stored in memory 195b. The software routine may also be stored or executed by another central processing unit (not shown), which may be located at a distance from the wind turbine.

Although the process according to the invention has been described as being executed by software routines, at least some of the processes of the invention may be performed by hardware. As such, the processes of the present invention may be implemented in software executed on a computer system, or in hardware such as an integrated circuit, or in combination of software and hardware.

As described above, according to the present embodiment, the air inlet 141 is made in the lower region of the tower 101, and the air outlet 142 is provided in the nacelle cover 130, which is the upper region of the tower 101. When the air flows into the air inlet 141 by the pressure difference and flows into the tower 101, the air flows into the interior of the tower 101, and then through the hole H of the nacelle cover 130 (see FIG. 2). After cooling to the nacelle, it may be discharged to the air discharge unit 142.

Since this air circulation can be repeated continuously, it is possible to perform a cooling action for the nacelle region even without a complicated or expensive cooling device as usual.

In addition, since the cable rotation support unit 170 is provided, even if the nacelle cover 130 is rotated, including the diarrhea blade 103, the cable C may be twisted and broken.

When a fire occurs in the nacelle area, when the fire detector 190 transmits a fire generation signal to the controller 195, the controller 195 controls the operation of the door driver 180 to control the platform door as shown in FIG. 6. 162 is disposed so that the natural convection circulation of the air connecting the air inlet 141 and the air outlet 142 is blocked. This may be advantageous for extinguishing the fire because air is blocked from the nacelle area where the fire occurred.

8 is a perspective view showing the operation of the platform door and the door driving unit in the wind power generator according to the second embodiment of the present invention.

In the present embodiment, both the opening 260a of the platform 260 and the platform door 262 have a rectangular plate shape.

In this structure, the door driver 280 is connected to the platform plate 262 having a rectangular plate shape, and causes the platform door 262 to open the platform 260 while sliding the platform door 262 in the direction of the dark arrow of FIG. 8. 260a is opened and closed.

In the present embodiment, the door driver 280 drives the rack gear 281 formed on the sidewall of the platform door 262, the pinion gear 282 interacting with the rack gear 281, and the pinion gear 282. May include a motor 283. The motor 283 may be fixed by mounting a bracket at an appropriate position of the platform 260.

According to the structure of the door driver 280, the platform door 262 is darkened in FIG. 8 as the pinion gear 282 and the rack gear 281 interact based on the driving of the motor 283 in the forward and reverse directions. It can be slidably moved in the direction of the arrow, which allows the opening 260a of the platform 260 to be selectively opened and closed.

Although the present embodiment has been described in detail with reference to the drawings, the scope of the present invention is not limited to the above-described drawings and descriptions.

In the above-described embodiment, the air inlet and the air outlet are respectively provided on the lower part of the tower and the back of the nacelle cover, but in particular, the air outlet need not necessarily be provided on the back of the nacelle cover. It may be arranged.

Since the nacelle cover of the above-described embodiment has a hexahedral structure, the air inlet 141 and the air outlet 142 are manufactured in a planar shape, but if the nacelle cover has a curvature, the air inlet 141 corresponds to the curvature. ) And the air outlet 142 may have an arc shape.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

101: Tower 103: Blade
110: rotor 120: main shaft
130: nacelle cover 131: left cover
132: right cover 133: top cover
141: air inlet 142: air outlet
150: louver module 151: module frame
152: Louver 153a, 153b: First and Second Filters
154: first filter support 155: second filter support
160: platform 161: hatch
162: platform door 170: cable rotation support
171: fixed holder 172: rotation holder
173: bearing 174: sealing compound
180: door driving unit 190: fire detection unit
195: controller

Claims (10)

A nacelle cover in which a nacelle for generating electric energy by generating power through a rotational movement of a blade rotated by wind is embedded;
A plurality of cables connected to the nacelle are disposed therein, a lower end supported on the ground and an upper end connected to the nacelle cover to support an axial load of the nacelle cover; And
The air inlet is provided in the lower region of the tower, and the air outlet provided on one side of the nacelle cover, the nacelle by the natural convection circulation of air according to the pressure difference between the air inlet and the air outlet A wind turbine comprising a nacelle cooling unit for cooling the region. The method of claim 1,
The air inlet is provided in the tower door disposed in the lower area of the tower to form an access passage into the tower, the air exhaust is provided on the back of the nacelle cover,
And a louver module to each of the air inlet and the air outlet. The method of claim 2,
The louver module,
A closed-loop module frame forming an outer frame of the front surface;
A plurality of louvers disposed in the module frame; And
Removably coupled to one side of the module frame, the wind turbine including at least one filter for filtering foreign matter in the air circulated. The method of claim 3,
The at least one filter includes a first filter and a second filter in charge of different functions for filtering,
The louver module,
A first filter support disposed on a rear surface of the module frame and having a first filter slot into which the first filter is slidingly inserted; And
And a second filter support portion connected to a rear surface of the first filter support portion so that a second filter slot into which the second filter is slidingly inserted is formed between the first filter support portion. The method of claim 1,
At least one platform is disposed inside the tower to be disposed along a direction crossing the longitudinal direction of the tower to form a foothold of the operator.
And a cable rotation support unit coupled to the platform to rotatably support the plurality of cables. The method of claim 5,
The cable rotation support portion,
A fixed holder fixed to the platform; And
A rotating body disposed in the radially inner side of the fixed holder and passing the plurality of cables therein, and a flange portion formed at an upper end of the rotating body and larger than a diameter of the rotating body and disposed at an upper end of the fixed holder; Wind turbine comprising a rotary holder having a. The method according to claim 6,
And a bearing provided between the fixed holder and the rotary holder. The method according to claim 6,
And a plurality of cables disposed inside the rotary holder such that the rotary holder and the cable form a body so that the inner space of the rotary holder is sealed with a sealing compound. The method of claim 5,
A platform door provided on the platform to open and close the opening of the platform;
A door driver connected to the platform door to drive the platform door;
A fire detector provided inside the nacelle cover to detect a fire in the nacelle area; And
And a controller for controlling the operation of the door driver based on the detection signal of the fire detector. 10. The method of claim 9,
The fire detector,
Smoke detection module for detecting smoke when a fire occurs; And
Wind generator including a heat detection module for detecting heat in the event of fire.

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