Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
• • 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
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/16—Stator cores with slots for windings
• • 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
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
  • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2220/00—Application
  • F05B2220/70—Application in combination with
  • F05B2220/706—Application in combination with an electrical generator
  • F05B2220/7066—Application in combination with an electrical generator via a direct connection, i.e. a gearless transmission
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2240/00—Components
  • F05B2240/90—Mounting on supporting structures or systems
  • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
  • F05B2240/912—Mounting on supporting structures or systems on a stationary structure on a tower
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2260/00—Function
  • F05B2260/20—Heat transfer, e.g. cooling
  • F05B2260/221—Improvement of heat transfer
  • F05B2260/222—Improvement of heat transfer by creating turbulence
• • 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

Definitions

• the present invention relates to a stator for an electric generator, in particular a synchronous generator or a ring generator of a wind turbine.
• the invention further relates to such a synchronous generator or ring generator.
• the invention relates to a wind turbine with such a generator.
• Stator rings of the aforementioned type are known in principle. They usually have a plurality of grooves for receiving the stator winding, in which an electric power is induced by the rotor running along it.
• the stator rings are typically constructed to have a magnetic yoke adjacent the portion carrying the grooves.
• stator rings for internal rotor the magnetic yoke is located radially outside the region in which the grooves are provided.
• stator rings for external rotor it behaves the other way around.
• the grooves are radially outside the magnetic yoke.
• a principle of air cooling is known, for example, from WO2010 / 040659 A2.
• the cooling concept presented there is classified as satisfactory with regard to its mode of operation. Nevertheless, there is still a need to further improve the cooling performance in a generator and stator of the type described. Accordingly, the invention has the object to provide a stator with improved cooling ability.
• the stator has a plurality of grooves for receiving the stator winding, and adjacent to the grooves, a magnetic yoke, wherein the stator in the region of the magnetic yoke has a plurality of cooling air flow through baredeausEnglishept, and wherein the stator a plurality in the axial direction of the stator Having stacked stator laminations, wherein the cooling recesses extend through all the stator laminations.
• the magnetic yoke preferably has a first region immediately adjacent to the grooves, and a radially outer second region, which serves as a extended magnetic yoke is called.
• the cooling recesses are arranged in the extended magnetic yoke.
• the invention makes use of the knowledge that heat removal is most efficient where it occurs.
• the invention is advantageously further developed in that cooling fins are formed in one, several or all of the cooling recesses for increasing the surface area.
• the cooling recesses are formed as slots.
• the longitudinal sides of the elongated holes extend in the radial direction of the stator ring.
• the ends are not formed semicircular.
• slots are thus also recesses with a rectangular cross-section, possibly with rounded corners.
• At least two cooling recesses of the plurality of cooling recesses are separated by a web whose highest thickness in the circumferential direction of the stator ring is preferably equal to or less than the clear width of the cooling recesses in the circumferential direction.
• the thus sized web thus acts in addition to its supporting function as a cooling fin.
• the stator ring has a plurality of sets of at least two cooling recesses separated from one another by a web.
• preferably one set is provided for every third groove, or more preferably one set for every other groove, or alternatively and more preferably one set for each groove.
• the distance between two sets of cooling recesses is preferably greater than the distance between two cooling recesses adjacent within a set.
• the maximum thickness of the web between two cooling recesses within a set in the circumferential direction of the stator ring is preferably equal to or less than the clear width of the cooling recesses in the circumferential direction.
• the cooling recesses are arranged offset in the circumferential direction to the grooves.
• the staggered arrangement of the cooling recesses relative to the grooves ensures at sufficiently large dimensions of the cooling recess for a very uniform heat flow.
• the surface of the cooling recesses is contoured such that the formation of turbulence within the cooling recesses is favored.
• the formation of a turbulent air flow within the cooling recesses causes an increase in the heat transfer from the air to the surface of the cooling recesses.
• the contour is produced in the embodiment with a plurality of stacked stator laminations by means of an offset in the radial direction and / or in the direction of rotation of the cooling recesses between adjacent stator laminations. Due to the offset, the surface of the cooling recesses is technically roughened.
• the invention relates to an electric generator, in particular a synchronous generator or ring generator of a wind turbine, with a rotor and a stator, the stator having a stator ring.
• the invention solves according to this aspect, the underlying task described at the outset by the stator is formed according to one of the preferred embodiments described above.
• the rotor is designed as an internal rotor.
• the rotor of the generator is designed as an external rotor.
• the present invention relates to a wind energy plant, in particular a gearless wind energy plant, with an electric generator, in particular a synchronous generator or ring generator.
• the invention solves the underlying task in such a wind turbine by the generator is designed according to one of the preferred embodiments described herein.
• the wind turbine has at least one motor-driven, preferably electric motor-driven fan for generating a cooling air flow through the cooling recesses of the stator ring.
• Fig. 1 shows a wind turbine schematically in a perspective
• Fig. 2 shows a nacelle of the wind turbine according to FIG. 1 schematically in a perspective sectional view
• FIG. 3 is a simplified schematic perspective view of a stator of the wind turbine according to Figures 1 and 2,
• Fig. 4 is a partial schematic sectional view through the stator according to
• FIG. 4a is a partial view of Figure 4 concerning the magnetic yoke
• Fig. 5 is a partial schematic detail view of Figure 4 for a first
• Fig. 6 is a partial schematic detail view of Figure 4 for a second
• FIG. 7 shows a sectional view along the line A-A from FIG. 6.
• FIG. 1 shows a wind energy plant 100 with a tower 102 and a nacelle 104.
• a rotor 106 with three rotor blades 108 and a spinner 110 is arranged on the nacelle 104.
• the rotor 106 is set in rotation by the wind in operation and thereby drives a generator 1 (FIG. 2) in the nacelle 104.
• the nacelle 104 is shown in FIG.
• the nacelle 104 is rotatably mounted on the tower 102 and driven by an azimuth drive 7 in a generally known manner.
• a Machine carrier 9 is arranged, which holds a synchronous generator 1.
• the synchronous generator 1 is constructed according to the present invention and is in particular a slow-rotating, multi-pole synchronous ring generator.
• the synchronous generator 1 has a stator 3 and an internal rotor 5, also referred to as a rotor.
• the rotor or rotor 5 is connected to a rotor hub 13, which transmits the rotational movement of the rotor blades 108 caused by the wind to the synchronous generator 1.
• Fig. 3 shows the stator 3 in isolation.
• the stator 3 has a stator ring 16 with an inner circumferential surface 18.
• a plurality of grooves 17 is provided, which are formed for receiving the stator winding in the form of conductor bundles.
• the stator ring 16 of the stator 3 has a stator winding in a first radial region W.
• the stator winding is housed in the form of conductor bundles 12 in the grooves 17 which extend from the inner circumferential surface 18 from. Adjacent to the region W, the magnetic yoke J is formed.
• the magnetic yoke J is radially outside the range W with the stator winding.
• the rotor would rotate radially outward of the stator, and thus the magnetic yoke would be located radially within the region of the stator windings adjacent thereto.
• An additional graphic representation is omitted here for the sake of clarity.
• an air gap S is formed between the stator 3 and the rotor 5.
• a plurality of sets 15 of cooling recesses 19 are formed in the stator ring 16.
• a set 15 of cooling recesses may comprise one or more cooling recesses. In each case one set of cooling recesses may be provided for one, two, three, four, or more than four grooves.
• the schematic partial view in FIG. 4a shows the division of the magnetic yoke J into a first region J1 and a second region J2 adjoining radially outside.
• the second region J2 is understood as the extended magnetic yoke.
• the cooling recesses are preferably arranged in the second region J2. in the In the present exemplary embodiment, a set 15 of cooling recesses is assigned in each case to three grooves 17 in each case.
• Figures 5 and 6 show various details of the invention, each isolated from each other. However, it is assumed in the sense of the invention that the individual features, which are each shown only in one of the embodiments, can also be combined with the features of the other embodiments. Figures 5 and 6 show no curvature of the stator ring 13. The details shown apply to both generators with internal and external rotor.
• FIG. 5 first a set 15 consisting of two cooling recesses 19 is shown.
• the cooling recesses 19 are spaced from each other in the circumferential direction and arranged offset to the grooves 17.
• Each of the recesses 19 according to FIG. 5 has a multiplicity of cooling fins 21.
• the cooling recesses 19 within a respective set 15 are spaced apart by a thin web 20.
• the web 20 has at its widest point a thickness 23 which is smaller than a distance 25 between the cooling recesses 19 of adjacent sets 15.
• the width 23 of a respective web 20 is less than or equal to the width in the direction of rotation of one of the cooling recesses 19th
• FIG. 7 shows a section along the line AA from FIG.
• the stator lamination packages 16a, b, c, d, e, f,..., N are offset from one another in the radial direction such that the inner surface of the cooling recess 19 is roughened.
• the offset 27 can be small.
• An offset of a few millimeters favors the heat exchange between the cooling air in the cooling recess 19 and the stator plates 16a-n. It is not necessary for the stator laminations to be offset relative to one another for such a configuration. It is sufficient if the respective cooling recesses 19a-n extending through the individual sheets 16a-n are slightly offset relative to each other.
• the cooling recesses 19 according to FIG. 1 shows a section along the line AA from FIG.
• the stator lamination packages 16a, b, c, d, e, f,..., N are offset from one another in the radial direction such that the inner surface of the cooling recess 19 is rough
• cooling recesses 6 be provided with cooling fins.
• more than two cooling recesses may also be formed, and a set 15 of cooling recesses 19 may be assigned in a number of grooves 17 different from those in FIGS. 5 and 6.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Energy (AREA)
• Sustainable Development (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Motor Or Generator Cooling System (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=56368933

Family Applications (1)

Country Status (8)

Families Citing this family (4)

Family Cites Families (20)

• 2015
  • 2015-07-17 DE DE102015213514.4A patent/DE102015213514A1/de not_active Withdrawn
• 2016
  • 2016-06-21 BR BR112018000928A patent/BR112018000928A2/pt not_active Application Discontinuation
  • 2016-06-21 CN CN201680041913.5A patent/CN107852043A/zh active Pending
  • 2016-06-21 CA CA2992655A patent/CA2992655A1/en not_active Abandoned
  • 2016-06-21 JP JP2018502088A patent/JP2018524965A/ja active Pending
  • 2016-06-21 WO PCT/EP2016/064290 patent/WO2017012810A1/de active Application Filing
  • 2016-06-21 US US15/744,669 patent/US20180205272A1/en not_active Abandoned
  • 2016-06-21 EP EP16736015.5A patent/EP3326264A1/de not_active Withdrawn

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