ZA200308208B - Supporting construction for the stator of a ring generator of a wind turbine. - Google Patents
Supporting construction for the stator of a ring generator of a wind turbine. Download PDFInfo
- Publication number
- ZA200308208B ZA200308208B ZA200308208A ZA200308208A ZA200308208B ZA 200308208 B ZA200308208 B ZA 200308208B ZA 200308208 A ZA200308208 A ZA 200308208A ZA 200308208 A ZA200308208 A ZA 200308208A ZA 200308208 B ZA200308208 B ZA 200308208B
- Authority
- ZA
- South Africa
- Prior art keywords
- stator
- support structure
- support arms
- generator
- wind power
- Prior art date
Links
- 238000010276 construction Methods 0.000 title description 2
- 238000009434 installation Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims 2
- 230000010355 oscillation Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 210000003454 tympanic membrane Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
- H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
- H02K7/1838—Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Wind Motors (AREA)
Description
Aloys WOBBEN, Aloys - Argestrasse 19, 26607 Aurich - Wind power installation
Fg ——
The present invention concerns a wind power installation having a support structure for the stator of a ring generator, wherein the support structure has a plurality of support arms.
Such wind power installations have long been known and are produced and marketed for example by Enercon under the type designations E-40, E-58 or E-56.
Operation of such wind power installations always involves the production of sound emissions which can be perceived to be disturbing, at least in the area relatively closely around the wind power installation.
Therefore the object of the present invention is to reduce the sound emissions emanating from a wind power installation as set forth in the classifying portion of the claim.
That object is attained by a wind power installation having the features recited in claim 1. Advantageous developments are described in the appendant claim.
While in the case of a support structure with an even number of support arms which can develop given frequencies uniformly in the peripheral direction of the ring generator, which are then perceived as sound waves that are experienced as being a disturbance, such sound emissions are entirely suppressed or reduced when the structure involves an odd number of support arms and/or irregular spacing of the support arms.
The invention will be described in greater detail with reference to the drawings in which:
Figure 1 shows a simplified view of the state of the art,
Figure 2 shows an alternative configuration of the state of the art,
Figure 3 shows an embodiment of a support structure according to the invention, and
Figure 4 shows an alternative view of the conditions of the " embodiment according to the invention as shown in Figure 3.
Figure 1 shows a support structure having six radially extending ” support arms 12, the outer portions of which are arranged at an equal spacing relative to each other. The stator 10 of a ring generator is fixed to those outer portions. The stator 10 is indicated in the Figure by broken lines.
With this design configuration of a support structure, oscillations 20 can be formed distributed over the periphery between the support arms 12.
The uniform spacing between the support arms 12 and the wavelength of the oscillations 20, which respectively coincides therewith, can give rise to an effect which is referred to as the ‘drum effect’. What is more crucial in terms of sound emission however are the formation of natural modes (natural forms) which can be produced upon excitation with a given oscillation. Those natural modes are usually dependent on or determined by the geometry of the overall object.
Figure 2 is an alternative view showing the situation in the case of the known support structure. In this Figure, the oscillations 20 are shown in conjunction over the periphery of the support structure with the support arms 12. The oscillations are shown by a dotted line displaced by half a period, and identified by reference numeral 20a.
If any point on the periphery of the support structure (or a molecule of air at that location) is considered, it will be seen that there, depending on the respective phase position of the oscillations 20, 20a, the position thereof alters along a line indicated by the arrow 30. Therefore for that point here there is a bidirectional oscillation, as in the case of an eardrum.
This Figure shows three complete periods of an oscillation, distributed over the periphery of the arrangement, so that three respective in-phase points are always oscillating with the same magnitude and in the same direction. Those oscillations result in a regular 'pump movement’ in the stator of the generator, which is perceived as sound.
Figure 3 shows in simplified form a support structure according to the invention. It has an odd number of support arms 12 (in this case seven). It will be appreciated that the object of the present invention can v also be attained with five support arms, preferably at least seven support arms 12 are used for reasons of the required strength of the support ” structure. In this Figure, the stator 10 of the ring generator is again indicated by broken lines.
Figure 4, similarly to Figure 2, shows a representation of the oscillations which are linked together over the periphery of the support structure. In this case, once again a sequence of oscillation events is identified by reference numeral 20 while reference numeral 20a also represents those oscillation events but displaced by half a period with respect to the oscillations identified by reference numeral 20.
The oscillations identified by reference numeral 20 show three complete oscillation periods in the portions 21, 22 and 23 while only half a period occurs in the portion 24.
By virtue of that oscillation pattern, two positive half-waves (haif- periods) are directly mutually adjacent, more specifically at the beginning of the portion 21 and in the portion 24, so that accordingly the drum effect cannot occur at least at that location and is thus at least reduced in its overall effect.
If a mechanical construction such as for example the support structure of a generator produces an unwanted sound emission, that can usually be explained on the basis that, under the action of oscillations, the entire support structure produces so-called resonances or also ‘natural modes’ (natural forms). Those 'natural modes' are firstly dependent on the geometry of the entire object, in addition there is also a certain frequency dependency of various natural modes.
With the design configuration according to the invention of the support arms of the status, the frequency pattern of that component is such that frequencies at which in particular sound-emitting natural modes (natural forms) could occur are avoided as much as possible. - _ -
Claims (3)
1. A wind power installation having a generator, preferably a ring } generator, comprising a rotor and a stator which has a mounting means for stator windings, wherein the stator is held by a support structure which has a plurality of support arms and wherein an odd number of support arms (12) are provided and/or the support arms are at least in part irregularly spaced.
2. A wind power installation according to claim 1 characterised in that the support structure for the stator has seven support arms.
3. A wind power installation having a generator, preferably a ring generator, comprising a rotor and a stator which has a mounting means for the stator windings, wherein the stator is held by a support structure, wherein the support structure is so designed that it produces substantially no or only slight sound-emitting natural modes (natural forms) in the normal operating range.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10121647 | 2001-05-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA200308208B true ZA200308208B (en) | 2004-02-03 |
Family
ID=7683577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA200308208A ZA200308208B (en) | 2001-05-03 | 2003-10-22 | Supporting construction for the stator of a ring generator of a wind turbine. |
Country Status (1)
Country | Link |
---|---|
ZA (1) | ZA200308208B (en) |
-
2003
- 2003-10-22 ZA ZA200308208A patent/ZA200308208B/en unknown
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