WO2009088171A2

WO2009088171A2 - Aerogenerator

Info

Publication number: WO2009088171A2
Application number: PCT/KR2008/007802
Authority: WO
Inventors: Min Sung Lee
Original assignee: Min Sung Lee
Priority date: 2008-01-10
Filing date: 2008-12-30
Publication date: 2009-07-16
Also published as: KR20090077105A; WO2009088171A3

Abstract

The present invention provides an aerogenerator which can continuously and reliably generate electricity even in any kind of wind. The aerogenerator includes an increasing gearbox (140) which is provided on a lower end of a rotating shaft (111) coupled to an impeller (113), and a CPU (90) which controls the aerogenerator using an anemometer (121) and an RPM sensor (120) which is provided on the rotating shaft, a D/C generating unit (3) and a storage battery (300). The aerogenerator further includes an oil pump (1) which is operated depending on a signal of the CPU and is connected to an oil pump actuating shaft of the increasing gear box, and an A/C generating unit (2) which is operated by the CPU and the oil pump using data signals pertaining to a variable wind velocity and an RPM of the rotating shaft depending on the wind velocity.

Description

AEROGENERATOR

Technical Field

[1] The present invention relates, in general, to aerogenerators and, more particularly, to an aerogenerator which can generate electricity even in a soft wind and be reliably operated even in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind without malfunctioning or being damaged, and in which the maximum generation capacity can be varied depending on wind velocity, thus reliably and smoothly generating electricity. Background Art

[2] Generally, aerogenerators convert energy of natural wind into mechanical energy using impellers to generate electricity. Such an aerogenerator includes an impeller, a rotating shaft which is rotated by the impeller, a generating unit which generates electricity using the rotation of the rotating shaft, and a storage battery. The rotating shaft comprises one of a vertical shaft and a horizontal shaft.

[3] In conventional arts, various aerogenerators were proposed. The largest problems of the conventional aerogenerators are the requirements that electricity must be generated even in a soft wind and, as well, electricity must be smoothly and reliably generated even in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind without malfunctioning of the aerogenerators.

[4] In order to achieve the above-mention purposes, proposed were aerogenerators which can generate electricity even in a soft wind and which can reliably generate electricity even in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind without malfunctioning.

[5] However, in the conventional aerogenerators, because of weakness of the structures constituting essential elements, unsolved problems result because electricity is not smoothly generated in a soft wind, and the structures are damaged in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind. Due to the problems of damage to the structures, there are few aerogenerators which have reliably generated electricity hitherto after they were installed in sites where wind power generation is performed. In particular, although the conventional aerogenerators have structures that can withstand any wind velocity, the generation amount exceeds the maximum generation capacity in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind. Therefore, the generation cannot be smoothly performed.

[6] Typically, aerogenerators which are installed mainly in wind power generation sites include a vertical frame which has a tower structure, a rotating shaft which is supported by the upper end of the vertical frame and is oriented in the horizontal direction, and a "Y"-shaped impeller which is provided on the rotating shaft.

[7] However, in the case of the aerogenerators having the above construction, domestic houses suffer from noise attributable to rotation of the very large impeller. In addition, the shadow of the large impeller falls on crops. As such, the aerogenerators cause several bad effects to various domestic houses adjacent to sites where the aerogenerators are installed.

[8] Particularly, in the case of the aerogenerators having the "Y"-shaped impellers, the angle of the impeller may be undesirably changed by an ultra strong wind or the main body may be damaged, so that generation is interrupted. Furthermore, in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind, the maximum generation capacity of the aerogenerator reaches its limit. Thus, the generation cannot be continuously and smoothly performed. Disclosure of Invention Technical Problem

[9] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an aerogenerator which has a structure including an impeller and a frame which can withstand any kind of wind, thus preventing the aerogenerator from malfunctioning or getting damaged, so that generation of electricity can be continuously and reliably performed without generating noise, and which is constructed such that a CPU detects the amount of generation beyond the maximum capacity of a D/C generating unit connected to a rotating shaft and operates an oil pump to sequentially operate A/C generators, so that even in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind, the aerogenerator can absorb mechanical impact and can smoothly and continuously generate electricity. Technical Solution

[10] In order to accomplish the above object, the present invention provides an aerogenerator, including an increasing gearbox provided on a lower end of a rotating shaft coupled to an impeller, a CPU to control the aerogenerator using an anemometer and an RPM sensor provided on the rotating shaft, a D/C generating unit and a storage battery, the aerogenerator comprising: an oil pump to be operated depending on a signal of the CPU, the oil pump being connected to an oil pump actuating shaft of the increasing gear box; and an A/C generating unit to be operated by the CPU and the oil pump using data signals pertaining to a variable wind velocity and an RPM of the rotating shaft depending on the wind velocity. [11] The increasing gearbox may include: a first bearing supporting a lower end of the rotating shaft, and a fly wheel ring gear provided on the rotating shaft at a position adjacent to the lower end of the rotating shaft; a second bearing supporting a lower end of a generator shaft of the D/C generating unit, and a first pinion gear provided on the generator shaft at a position adjacent to the lower end of the generator shaft, the first pinion gear engaging with the fly wheel ring gear; and a second pinion gear engaging with the fly wheel ring gear, the second pinion gear provided on the oil pump actuating shaft extending outwards from the increasing gearbox.

[12] The D/C generating unit may be connected to the generator shaft provided in the increasing gearbox.

[13] The A/C generating unit may include: a hydraulic oil storage tank having a first pipeline, with an oil filter and a first check valve provided on the first pipeline, the hydraulic oil storage tank being connected to the oil pump; a second pipeline provided with a rotary valve and a second valve, the second pipeline being connected to a high pressure oil storage tank; a third pipeline provided with a third check valve and a first cutoff valve, the third pipeline being connected to the high pressure oil storage tank; a first hydraulic motor and a first A/C generator provided on an end of the third pipeline; a fourth pipeline provided with a second cutoff valve and a first bypass valve, the fourth pipeline being connected to the third pipeline; a second hydraulic motor and a second A/C generator provided on an end of the fourth pipeline; a fifth pipeline provided with a third cutoff valve and a second bypass valve, the fifth pipeline being connected to the fourth pipeline; a third hydraulic motor and a third A/C generator provided on an end of the fifth pipeline; a sixth pipeline connected to the fifth pipeline, the sixth pipeline being connected to the hydraulic oil storage tank through the fifth pipeline; and first through third bypass pipelines respectively connected to the first through third hydraulic motors, the first through third bypass pipelines being connected to the hydraulic oil storage tank through the first through third hydraulic motors.

[14] The hydraulic oil storage tank may include: a temperature sensor to transmit a signal to the CPU; and a heating coil to be operated depending on the signal of the temperature sensor.

[15] The aerogenerator may further include an oil pressure sensor provided between the first through fourth cutoff valves to detect a pressure of oil in the fourth and fifth pipelines.

Advantageous Effects

[16] According to the present invention, an aerogenerator has a structure including an impeller and a frame which can withstand any kind of wind, thus preventing the aerogenerator from malfunctioning or getting damaged. Thus, generation of electricity can be continuously and reliably performed without generating noise. Furthermore, the aerogenerator is constructed such that a CPU detects the amount of generation beyond the maximum capacity of a D/C generating unit connected to a rotating shaft and operates an oil pump to sequentially operate A/C generators, so that even in a strong wind, a very strong wind of for example a typhoon, or a sudden gust of wind, the aerogenerator can absorb mechanical impact and can smoothly and continuously generate electricity. Brief Description of the Drawings

[17] FIG. 1 is a front view showing the general construction of an aerogenerator, according to an embodiment of the present invention;

[18] FIG. 2 is an enlarged sectional view showing the internal construction of an A/C generating unit according to the present invention;

[19] FIG. 3 is a front view showing the operation of a D/C generating unit of the aerogenerator when a rotating shaft is in a stopped state or when ultra-soft wind is blowing according to the present invention;

[20] FIG. 4 is a circuit diagram showing the operation of a first A/C generator of the A/C generating unit according to the present invention;

[21] FIG. 5 is a circuit diagram showing the operation of a second A/C generator of the

A/C generating unit according to the present invention;

[22] FIG. 6 is a front view showing an initial operation of an oil pump when the D/C generating unit exceeds the maximum capacity according to the present invention; and

[23] FIG. 7 is a circuit diagram showing a heating coil of the A/C generating unit according to the present invention. Best Mode for Carrying Out the Invention

[24] Hereinafter, an aerogenerator according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[25] FIG. 1 is a front view showing the general construction of the aerogenerator according to the embodiment of the present invention.

[26] As shown in the drawing, the aerogenerator of the present invention includes a frame

100, a rotating shaft 111 which is supported in the frame 100, and an impeller 113 which is provided on the rotating shaft 111.

[27] Above the impeller 113 provided on the rotating shaft 111, a housing 201 and a bearing 202 are fastened to the upper end of the frame 100 using bolts 200 and nuts 203. Furthermore, spline grooves 210 are formed in an end of the rotating shaft 111 below the impeller 113. The rotating shaft 111 is inserted into a housing 213 and a bearing 214 which are fastened to the frame 100 using the bolts 212. The spline grooves 210 are coupled to a spline joint 220. An upper part of the frame 100 has a female-male joint structure including a female frame part 230 and a male frame part 240. The female frame part 230 and the male frame part 240 are coupled to each other using fastening bolts 250, thus facilitating the assembly or disassembly of the frame 100.

[28] In the present invention, an RPM sensor 120 is provided around the rotating shaft

111 to monitor the RPM of the rotating shaft 111. An anemometer 121 is mounted to the frame 100. The anemometer 121 may comprise a plurality of anemometers 121. An increasing gearbox 140 which has a relatively simple structure unlike the conventional art is provided around a lower end of a lower part of the rotating shaft 111. A generator shaft 131 of a D/C generating unit 3 is coupled to the increasing gearbox 140. The D/C generating unit 3 generates electricity using the rotation of the generator shaft 131 and charges the electricity into a storage battery 300. An oil pump 1 is provided above the increasing gearbox 140. The oil pump 1 has an oil pump actuating shaft Ia and operates an A/C generating unit 2 which will be explained later.

[29] A first bearing 114 which supports the lower end of the rotating shaft 111 and absorbs rotating impact of the rotating shaft 111 is installed in the increasing gearbox 140. Furthermore, in the increasing gearbox 140, a fly wheel ring gear 117 is provided around the rotating shaft 111 at a position adjacent to the lower end thereof. A second bearing 115 which supports the lower end of the generator shaft 131 of the D/C generating unit 3 is installed in the increasing gearbox 140. A first pinion gear 118 which engages with the fly wheel ring gear 117 is provided around the generator shaft 131 at a position adjacent to the lower end thereof. An upper end of the generator shaft 131 has spline grooves 260 and is coupled to the D/C generating unit 3 through a spline joint structure 270.

[30] The aerogenerator of the present invention further includes a CPU 90 which sequentially operates the D/C generating unit 3, a hydraulic pump 1 and the A/C generating unit 2 using signals transmitted from the RPM sensor 120 and the anemometer 121.

[31] It is preferable that a frame and an impeller proposed in Korean Patent Registration

No. 7071320 (date: Apr. 6, 2007) which was filed by the applicant of the present invention be used as the frame 100 and the impeller 113. Furthermore, various modifications may be as applied to the frame 100 and the impeller 113, so long as the critical characteristics of the present invention remain.

[32] In the registered patent, the frame which is the same as the frame 100 of the present invention was already explained, and the facts were described, in which the impeller 113 which is provided in the frame can withstand any strong wind from the standpoint of mechanics, and, particularly, prevent noise, and is of a very high efficiency.

[33] In the present invention, the large first bearing 114 is provided on the rotating shaft 111, and lubricant oil is contained in the increasing gearbox 140. Thus, the present invention can solve a problem of a vertical load attributable to the weight of the rotating shaft 111 including the impeller 113 that is the greatest disadvantage of the wind power generator having the vertical rotating shaft. In addition, the lubricant oil can cool frictional heat generated by rapid rotation of the rotating shaft 111.

[34] FIG. 2 is an enlarged sectional view showing the internal construction of the A/C generating unit 2 according to the present invention.

[35] Referring to the drawing, the A/C generating unit 2 includes a high pressure oil storage tank 20 which is connected to the oil pump 1, and a hydraulic oil storage tank 19 which has a hydraulic oil check rod 23 therein. A vent port 24 is provided on the upper end of the hydraulic oil storage tank 19, and a drain cock 25 is provided at a predetermined position in the lower end of the hydraulic oil storage tank 19. The A/C generating unit 2 further includes first through third A/C generators 50, 51 and 52 and first through third hydraulic motors 60, 61 and 62 which respectively operate the first through third A/C generators 50, 51 and 52.

[36] The oil pump 1 is connected to the lower portion of the hydraulic oil storage tank 19 through a first pipeline 30 which has an oil filter 11 and a first check valve 12. As well, the oil pump 1 is connected to a second pipeline 31 which has a rotary valve 36 and a second check valve 3 and is connected to the upper portion of the high pressure oil storage tank 20.

[37] The first hydraulic motor 60 is connected to the high pressure oil storage tank 20 through a third pipeline 32 which has a third check valve 14 and a first cutoff valve 70. The second and third hydraulic motors 61 and 62 are respectively connected to fourth and fifth pipelines 33 and 34 which have second through fourth cutoff valves 71, 72 and 73. First through third bypass valves 80, 81 and 82 are respectively coupled to the third through fifth pipelines 32, 33 and 34, and the third through fifth pipelines 32, 33 and 34 are connected to the upper portion of the hydraulic oil storage tank 19. The first through third hydraulic motors 60, 61 and 62 are respectively connected to first through third bypass pipeline 40, 41 and 42. Ends of the first through third bypass pipelines 40, 41 and 42 are connected to the upper portion of the hydraulic oil storage tank 19.

[38] Here, the first through third check valves 12, 13 and 14, the rotary valve 36, the first through fourth cutoff valves 70, 71, 72 and 73 and the first through third bypass valves 80, 81 and 82 are controlled by the CPU 90.

[39] The oil filter 11 which is installed in the first pipeline 30 prevents precision parts constituting the oil pump 1 and the A/C generating unit 2 from being damaged by impurities contained in oil. The drain cock 25 which is provided on the hydraulic oil storage tank 19 is used when periodically replacing oil with new oil. [40] The A/C generating unit 2 includes oil pressure sensors 37, 38 and 39 which are operated at different pressures (for example, they are respectively operated at 150 PSI, 350 PSI and 500 PSI). Furthermore, the A/C generating unit 2 includes one-way bypass valves 80, 81 and 82 such that although one pipeline is interrupted, a substitution control function can be conducted. Thus, even if the first, second, third or fourth cutoff valve 70, 71, 72 or 73 malfunctions, when the pressure of the corresponding pipeline reaches a predetermined value, hydraulic pressure is automatically bypassed such that the second and third A/C generators 51 and 52 can be operated.

[41] The hydraulic oil storage tank 19 includes therein a heating coil 22 and a temperature sensor 21, which detects a temperature in the hydraulic oil storage tank 19. The CPU 90 controls the heating coil 22 such that hydraulic oil O in the hydraulic oil storage tank 19 is prevented from freezing even at a temperature lower than -5⁰C, for example, in the coldest season, thereby preventing malfunction of the oil pump 1 attributable to the freezing of the hydraulic oil O. The first check valve 12 is provided on the first pipeline 30, so that when the oil pump 1 is in the stopped state because of there being no wind, hydraulic oil O flows backwards into the hydraulic oil storage tank 19, thus preventing air causing malfunction of the oil pump 1 from entering the oil pump 1.

[42] Meanwhile, the second check valve 13 is provided on the second pipeline 31 to prevent pressure in the high pressure oil storage tank 20 from being applied backwards to the oil pump 1. The vent port 24 is provided on the hydraulic oil storage tank 19 to prevent negative pressure, that is, vacuum, from being created in the hydraulic oil storage tank 19 when the oil pump 1 is operated, thereby preventing malfunction of the oil pump 1. An oil check window 141 is provided in the hydraulic oil storage tank 19 to allow a user to check the amount of hydraulic oil O and a contamination level thereof. When necessary, contaminated hydraulic oil can be replaced with new oil though the drain cock 25.

[43] Furthermore, the rotary valve 36 is provided on the second pipeline 31 so that when a light wind is blowing, high pressure oil pumped by the oil pump 1 can be recycled such that the oil pump 1 can idle. The increasing gearbox 140 has a further simplified and solidified structure when compared to the conventional technique, thus preventing malfunction thereof. In addition, high pressure oil pumped by the oil pump 1 can be smoothly guided into the high pressure oil storage tank 20 which is an energy storage tank.

[44] FIG. 3 is a front view showing the operation of the D/C generating unit 3 of the aero- generator when the rotating shaft 111 is in a stopped state or when ultra-soft wind is blowing according to the present invention. FIG. 4 is a circuit diagram showing the operation of a first A/C generator 50 of the A/C generating unit 2 according to the present invention. FIG. 5 is a circuit diagram showing the operation of a second A/C generator 51 of the A/C generating unit 2 according to the present invention. FIG. 6 is a front view showing an initial operation of the oil pump 1 when the D/C generating unit 3 exceeds the maximum capacity according to the present invention.

[45] The operation of the aerogenerator of the present invention will be described in detail with reference to the attached drawings.

[46] First, the operation of the aerogenerator, when the rotating shaft 111 is in a stopped state or when ultra-soft wind is blowing, will be explained.

[47] When the rotating shaft 111 is in a stopped state or when ultra-soft wind is blowing, the fly wheel ring gear 117 which is provided on the rotating shaft 111 of the impeller 113 and is disposed in the increasing gear box 140, the first pinion gear 118 of the generator shaft 131 which is coupled to the D/C generating unit 3, and the second pinion gear 119 provided on the oil pump actuating shaft Ia are in the engaged state. In addition, the D/C generating unit 3 is in a stopped state or in a no-generation state although it slightly rotates, because the CPU 90 interrupts current of the rotor field line according to data transmitted from the RPM sensor 120 and the anemometer 121 such that the power is turned off. At this time, the oil pump 1 is in an idling state. In other words, when the second pinion gear 119 which is provided on the oil pump actuating shaft Ia of the oil pump 1 which is a medial connection power source of the first through third A/C generators 50, 51 and 52, is in the state of being engaged with the fly wheel ring gear 117, when the rotating shaft 111 is in a stopped state or when ultra- soft wind is blowing, and until the generation amount reaches the maximum capacity of the D/C generating unit 3, the CPU 90 converts the rotary valve 36 to a bypass position according to signals transmitted from the RPM sensor 120 and the anemometer 121, so that the oil pump 1 idles in a no-load state.

[48] Meanwhile, the operation of the aerogenerator, when a soft wind or stronger wind is blowing, will be explained below.

[49] When a soft wind or a middle level of wind stronger than soft wind is blowing, the

D/C generating unit 3 is operated by the rotation of the first pinion gear 118 which engages with the fly wheel ring gear 117 provided on the lower part of the rotating shaft 111. Data signals generated in the RPM sensor 120 and the anemometer 121 are transmitted to the CPU 90. When the rpm of the rotating shaft 111 reaches an appropriate value, the CPU 90 supplies an appropriate voltage current to a rotor input terminal of the D/C generating unit 3 to generate electricity. Generated electricity is charged into the storage battery 300. Until this time, the oil pump 1 idles in a no-load state.

[50] Next, the operation of the aerogenerator, when a fair wind or an initial strong wind is blowing, will be explained below.

[51] When the wind velocity increases and it reaches a degree corresponding to the maximum generating capacity of the D/C generating unit 3, the CPU 90 detects it using signals transmitted from the RPM sensor 120 and the anemometer 121 and turns the rotary valve 36 to a circulation position. The oil pump 1, which has engaged with the fly wheel ring gear 117 provided in the increasing gearbox 140 and has idled, supplies oil O from the hydraulic oil storage tank 19 into the high pressure oil storage tank 20 through the first check valve 12. Thereby, pressure in the high pressure oil storage tank 20 is increased. At this time, that is, when the CPU 90 operates the rotary valve 36 and thus operates the oil pump 1, power of the rotor field line terminal of the D/C generating unit 3 is intercepted, so that the D/C generating unit 3 is stopped.

[52] In detail, when a predetermined pressure, at which the first A/C generator 50 is operated, is formed in the third pipeline 32 connected to the high pressure oil storage tank 20, data of the first oil pressure sensor 37 provided on the third pipeline 32 is transmitted to the CPU 90. The CPU 90 which receives the data transmits a signal to the first cutoff valve 70 of the first A/C generator 50 to open the third pipeline 32, so that high pressure hydraulic oil 10 which has been stored in the high pressure oil storage tank 20 is transported to the first hydraulic motor 60 of the first A/C generator 50. Thereby, the first A/C generator 50 is operated and generates electricity, and generated electricity is sent through a separate line.

[53] Next, the operation of the aerogenerator, when an initial strong wind or stronger wind is blowing, will be explained below.

[54] When a wind greater than the maximum capacity of the first A/C generator 50 is blowing, the CPU 90 receives data from the RPM sensor 120 and the anemometer 121 and supplies current to the rotor field line terminal of the D/C generating unit 3, which has a capacity less than that of the first A/C generator 50 and can adjust the output depending on a wind velocity. Thus, the first A/C generator 50 and the D/C generating unit 3 are operated at the same time. Electricity accumulated by the D/C generating unit 3 is used to operate the aerogenerator of the present invention, and electricity generated by the first A/C generator 50 is sent through the separate line.

[55] When the outputs of the D/C generating unit 3 and the first A/C generator 50 reach the maximum outputs by the blowing of a strong wind while the D/C generating unit 3 and the first A/C generator 50 are operated, the RPM sensor 120, the anemometer 121 and the first oil pressure sensor 37 detect this and transmit related data to the CPU 90. The CPU 90 sends a signal to open the second cutoff valve 71 of the second A/C generator 51. In addition, high pressure hydraulic oil 10 is supplied to the second hydraulic motor 61 to operate the second A/C generator 51 and, simultaneously, power of the rotor field line of the D/C generating unit 3 is intercepted to stop the D/C generating unit 3. Thus, the first and second A/C generators 51 and 52 can be smoothly and reliably operated. [56] Next, the operation of the aerogenerator, when a wind greater than a strong wind (for example, of a typhoon) is blowing, will be explained below.

[57] If a very strong wind greater than the maximum capacity is continuous while the first and second A/C generators 50 and 51 are operated, the third A/C generator 52 is operated in the same manner as that when a strong wind is blowing, as stated above. Furthermore, when a wind greater than a strong wind, that is, a wind (for example, a sudden gust of wind) greater than the maximum generation capacity of the first through third A/C generators 50, 51 and 52 is blowing, the RPM sensor 120, the anemometer 121 and the third oil pressure sensor 39 detect this and transmit related data to the CPU 90. The CPU 90 opens the fourth cutoff valve 73 to an appropriate degree and thus bypasses an excessive amount of high pressure hydraulic oil 10 that is formed in the first through third A/C generators 50, 51 and 52, thus preventing the first through third A/C generators 50, 51 and 52 from being damaged by excessive output. Furthermore, even if a very strong wind (for example, one of an ultra strong typhoon) is blowing, the aerogenerator can be continuously operated without being interrupted. In addition, the first through third A/C generators 50, 51 and 52 can reliably continuously generate electricity at their maximum outputs. Here, some of electricity generated by the D/C generating unit 3 is charged into the storage battery 300 to use as power for operating the aerogenerator of the present invention, and the rest of the electricity is discharged. Electricity generated by the first A/C generator 50 is sent through the separate line.

[58] FIG. 7 is a circuit diagram showing the heating coil 22 of the A/C generating unit 2 according to the present invention.

[59] The heating coil 22 which is installed in the hydraulic oil storage tank 19 is operated by the temperature sensor 21, which detects the temperature in the hydraulic oil storage tank 19. The heating coil 22 functions to maintain the hydraulic oil O at an appropriate temperature, thus preventing the hydraulic oil O in the hydraulic oil storage tank 19 from freezing even at a temperature lower than -5⁰C, for example, in the coldest season, thereby preventing malfunction of the oil pump 1 attributable to the freezing of the hydraulic oil O.

[60] As described above, an aerogenerator of the present invention is constructed such that the CPU receives data signals from an anemometer and an RPM sensor which monitors the RPM of a rotating shaft. Thus, when a soft wind is blowing, power of a storage battery is supplied to a D/C generating unit at an appropriate rotor input voltage to generate electricity. When a wind greater than the maximum generating capacity of the D/C generating unit is blowing, the CPU operates an A/C generating unit and thus sends hydraulic oil to a high pressure oil storage tank. When the pressure in the high pressure oil storage tank is greater than a predetermined pressure, the CPU detects it using signals transmitted from an oil pressure sensor and the RPM sensor and appropriately controls valves provided on pipelines to operate corresponding hydraulic motors. Thereby, first through third A/C generators are sequentially operated to generate electricity. Some of the electricity accumulated in the storage battery is used to operate the aerogenerator, and the rest of the electricity is discharged. Electricity generated by the A/C generating unit is sent through a separate line. Therefore, the generation of electricity can be reliably and continuously conducted, so that despite irregular wind blowing, electricity can be very evenly output.

[61] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

[62]

Claims

[1] An aerogenerator, including an increasing gearbox provided on a lower end of a rotating shaft coupled to an impeller, a CPU to control the aerogenerator using an anemometer and an RPM sensor provided on the rotating shaft, a D/C generating unit and a storage battery, the aerogenerator comprising: an oil pump to be operated depending on a signal of the CPU, the oil pump being connected to an oil pump actuating shaft of the increasing gear box; and an A/C generating unit to be operated by the CPU and the oil pump using data signals pertaining to a variable wind velocity and an RPM of the rotating shaft depending on the wind velocity.

[2] The aerogenerator according to claim 1, wherein the increasing gearbox comprises: a first bearing supporting a lower end of the rotating shaft, and a fly wheel ring gear provided on the rotating shaft at a position adjacent to the lower end of the rotating shaft; a second bearing supporting a lower end of a generator shaft of the D/C generating unit, and a first pinion gear provided on the generator shaft at a position adjacent to the lower end of the generator shaft, the first pinion gear engaging with the fly wheel ring gear; and a second pinion gear engaging with the fly wheel ring gear, the second pinion gear provided on the oil pump actuating shaft extending outwards from the increasing gearbox.

[3] The aerogenerator according to claim 2, wherein the D/C generating unit is connected to the generator shaft provided in the increasing gearbox.

[4] The aerogenerator according to claim 1, wherein the A/C generating unit comprises: a hydraulic oil storage tank having a first pipeline, with an oil filter and a first check valve provided on the first pipeline, the hydraulic oil storage tank being connected to the oil pump; a second pipeline provided with a rotary valve and a second valve, the second pipeline being connected to a high pressure oil storage tank; a third pipeline provided with a third check valve and a first cutoff valve, the third pipeline being connected to the high pressure oil storage tank; a first hydraulic motor and a first A/C generator provided on an end of the third pipeline; a fourth pipeline provided with a second cutoff valve and a first bypass valve, the fourth pipeline being connected to the third pipeline; a second hydraulic motor and a second A/C generator provided on an end of the fourth pipeline; a fifth pipeline provided with a third cutoff valve and a second bypass valve, the fifth pipeline being connected to the fourth pipeline; a third hydraulic motor and a third A/C generator provided on an end of the fifth pipeline; a sixth pipeline connected to the fifth pipeline, the sixth pipeline being connected to the hydraulic oil storage tank through the fifth pipeline; and first through third bypass pipelines respectively connected to the first through third hydraulic motors, the first through third bypass pipelines being connected to the hydraulic oil storage tank through the first through third hydraulic motors.

[5] The aerogenerator according to claim 2, wherein the hydraulic oil storage tank includes: a temperature sensor to transmit a signal to the CPU; and a heating coil to be operated depending on the signal of the temperature sensor.

[6] The aerogenerator according to claim 3, further comprising: an oil pressure sensor provided between the first through fourth cutoff valves to detect a pressure of oil in the fourth and fifth pipelines.