EP2577850A2

EP2577850A2 - Electric drive assembly

Info

Publication number: EP2577850A2
Application number: EP11723281.9A
Authority: EP
Inventors: Norbert Wibben; Norbert KÖTTING; Karl Stermann; Fabio Bertolotti
Original assignee: SSB Wind Systems GmbH and Co KG
Current assignee: SSB Wind Systems GmbH and Co KG
Priority date: 2010-06-02
Filing date: 2011-04-19
Publication date: 2013-04-10
Also published as: DE102010017222A1; WO2011151106A2; CN102270895A; DE202010018108U1; WO2011151106A3; CN202127321U; US20130076174A1

Abstract

The invention relates to an electric drive assembly, comprising an electric motor (19), which is arranged in a motor housing (20), a fan assembly (22) which is arranged on an end face of the motor housing (20) and comprises a fan (23) and by means of which a cooling air flow (53) that removes lost heat of the electric motor (19) can be generated, electronic components (33) by means of which the electric motor (19) can be controlled, and at least one box-shaped motor panel (30), which sits on the motor housing (20) and receives the electronic components (33), wherein heat generated during operation of the electronic components (33) can be discharged by means of the motor panel (30) to a heat sink (32) which is in thermally conductive contact with the motor panel (30).

Description

Electric drive arrangement

description

The invention relates to an electric drive assembly with an electric motor which is arranged in a motor housing, arranged on an end face of the motor housing and a fan fan assembly by means of which a heat loss of the electric motor laxative cooling air flow can be generated, electronic components, by means of which the electric motor controllable or is controllable, and at least one electronic components receiving, sitting on the motor housing, box-shaped engine panel. The invention further relates to a cooling device for a drive assembly and an electric Blattwinkelverstell- drive with a drive assembly.

Modern wind turbines comprise rotor blades rotatably mounted on a rotor, wherein a An ^¬ strömwinkel of the wind can be varied by an individual change ^¬ tion of the blade angle relative to each rotor blade. An associated Blattwinkelverstellantrieb (pitch drive) is usually located near or directly on the bearing of the rotor blade to be adjusted or in the rotor itself and includes a Elektromo ^¬ tor with mechanical adjustment elements for each rotor blade. The motor associated with electronic components, carried out with de ^¬ NEN a control and / or regulation of the motor, in particular an angle-oriented control and / or regulating the motor shaft. These electronic components are brought in ^¬ in a box-shaped housing or switch box, which is referred to here as a motor panel or box-shaped motor panel, the motor panel is usually mounted directly on the motor housing, either placed on the lateral surface of the Motorgehäu ^¬ ses (axial arrangement) or attached to an end face of the motor housing (radial arrangement).

The axial arrangement of the engine panel has the advantage that it is simpler in terms of mechanical construction, ensures more even and faster air flow, does not compromise on overall length and simpler attachment to the engine. Motor and Motor panel Benö ^¬ term when operating a cooling device to dissipate the resulting heat during operation. For this purpose, a fan assembly is usually used for the engine, which is arranged either on an end face of the motor housing or transversely thereto.

The invention is preferably based on the frontal arrangement of the fan and the axial arrangement of the engine panel on Mo ^¬ gate, as this construction ensures optimal and effective management of the cooling air flow. The cooling air flow can be guided along the entire motor surface, without the need for elaborate deflection elements. The electronic components arranged in the motor panel are cooled by cooling elements or separate fans, which are combined either directly or indirectly with the engine ventilation. DE 196 18 996 AI shows an electric machine with egg ^¬ nem frontally arranged fan blower and arranged on the machine housing seated terminal box, are housed in the electronic components. The terminal box has an opening in the direction of the fan blower. A partial air flow of the blower is by means of a via the

Fan housing arranged branch ducts targeted over the ^¬ fene side led to the terminal box, so as to dissipate the heat loss of the components in the box. The terminal box is firmly connected to the machine housing.

DE 197 03 655 C2 shows an electric drive with egg ^¬ nem engine and arranged on the motor circumference in the axial direction power electronics. At a front side of the engine, a fan is provided, wherein a partial air flow of the

Fan current is passed in an annular space between the motor housing and egg ^¬ nem outer housing jacket.

The EP 1 511 156 A2 shows an optimized cooling air supply for an electric motor with a mounted on the motor outer wall box for the power electronics and attached to the front of the motor fan. The pointing in the direction of the motor bearing surface of the box has on a partial surface cooling fins for the power electronics with an opening in the box floor in the direction of the motor housing. Between the motor housing and the box bottom an annularly mounted fan duct is provided, are provided in the devices for distributing the cooling air of the fan to the power electronics, which direct the cooling air flow in the field of power electronics. The US 5,763,969 A shows an electric motor with attached power electronics and arranged on the front side of the motor fan assembly. The power electronics are arranged in a box which is open at its supplied to the motor housing ^¬ facing the ground and is provided there with cooling fins which ensure a thermal separation between the motor housing and Leis ^¬ consumer electronics. Between the ribs flows a part of the fan current of the motor fan.

For use in pitch drives in wind turbines known from the prior art cooling devices for the engines are disadvantageous because they - due to the limited space in the rotor hub wind energy system ^¬ - no optimal heat dissipation of the engine and the engine-mounted motor panel ensure with its arranged there electronic components. The direct cooling of the cooling ribs of the electronic components mounted by a partial air flow of the fan due to an almost direct over ^¬ transmission of vibrations of the engine during operation on the Mo ^¬ tor panel, partially sensitive electronic components. This effect occurs in particular

Carrying out a braking operation of a angle-controlled electric drive in wind turbines, as is the case with pitch systems. The drive shaft of the Elect ^¬ romotors is thereby braked by a braking device and / or retained and then released again. These operations each produce strong vibrations, which can in particular those in the engine panel is arranged ^¬ electronic components cause a malfunction in the engine and in the engine panel. DE 197 04 226 B4 shows an electric motor with an axially arranged on the motor longitudinal motor panel, is housed in the signal and power electronics. The engine has a fan on the front side, whose cooling air only cools the engine. Between the motor housing and the motor panel, an axially extending intermediate part is provided, which is fixed di ^¬ rectly on the motor housing and is thermally insulated on the Mo ^¬ gate panel side facing. The ^motor panel projects laterally beyond the intermediate part. Only at the engine-facing Überragfläche of the engine panel a cooling fins formed by cooling fins is provided, which is in close thermal contact with the power electronics and is thermally isolated from the motor panel by a thermal barrier.

If several electronic power components to cool, which have a distance from one another, they must be brought into contact with the heat sink. For this purpose, a hole in the thermal barrier and a hole in the motor panel provided for each of the components to be cooled, the latter hole is additionally sealed so that penetration of dirt and moisture in the engine panel can be verhin ^¬ ver. This is associated with a relatively high production cost.

Proceeding from this, the invention has the object weiterzu ^¬ form an object of the type mentioned that multiple electronic components can be cooled with a ge ^¬ ringeren manufacturing effort. In addition, it is preferable for a good or improved cooling to have a Transmission of harmful vibrations to the engine panel can be prevented or at least reduced. Preference ^{¬ way} , there is also the need to solve the motor panel easily and easily from the motor housing and replace with regard to the preferred use of the aforementioned object.

This object is achieved with an electric on ^¬ drive arrangement according to claim 1 and with a cooling device according to claim 26. Advantageous developments of the invention are given in the dependent claims.

The electric drive assembly according to the invention comprises an electric motor, which is arranged in a motor housing, arranged on a front side of the motor housing and a fan having fan assembly by means of which a heat loss of the electric motor laxative cooling air flow can be generated, electronic components, by means of which the electric motor controllable and / or is controllable, and at least one the electronic components receiving, sitting on the Mo ^¬ gate housing, box-shaped motor panel, wherein by means of the motor panel during operation of the electronic building ^¬ elements resulting heat to a heat-conducting contact with the motor panel heat sink is deliverable.

The release of heat occurring during operation of the electronic components to the heat sink thus takes place with the interposition of the motor panel, so that no direct contact of the components to be cooled with the heat sink is required. The manufacturing cost of providing holes, for the sealing of the same and for the provision of a thermal barrier can thus be avoided or at least reduced.

However, it is also possible in the invention to provide at least one additional cooling ^¬ body for at least one of the components, if the at least one component rela ^¬ tively emits a lot of heat. The at least one component communicating with the at least one additional heat sink preferably directly or indirectly in heat-conducting contact, wherein the at least protrudes an additional heat sink, for example, from the engine or located outside panel or on an outer wall of the ^¬ same. Nevertheless, the production cost is wei ^¬ terhin reduced, as are provided for the other components no holes in the motor panel and sealed. The at least one additional heat sink can include, for example, cooling fins or be formed by them.

The dissipation from occurring during operation of the pre see ^¬ nen in the motor-panel electronic components heat to the heat sink preferably takes place via convection, preferably exclusively by convection. A transmission of vibrations connected with the cooling air flow in the case of direct cooling of the electronic components can thus be avoided or at least reduced.

The heat sink is preferably solid ver ^¬ connected to the motor housing. In particular, the motor panel is detachably attached to the cooling ^¬ body. Preferably, the motor panel is removably connected by Zvi ^¬ rule circuit of the heat sink to the motor housing. The cooling of the motor panel and thus the dissipation of during operation of the electronic components on Heat passing through thus takes place by heat-conducting contact of the motor panel with the fixed to the motor housing ^{verbunde ¬} nen heat sink, which is preferably cooled by the provided by the provided on the front side of the motor housing fan ^¬ fenen cooling air flow. Preferably, the cooling ^¬ air flow cools the motor housing, which cools the heat sink, so ^¬ that the heat sink is in particular indirectly cooled by the cooling air flow. Since the motor panel can preferably be separated from the heat sink and thus in particular also from the motor housing, a simple replacement of the motor panel is also possible.

The proposed indirect cooling mode of the engine panel in conjunction with its mounting on the engine housing not only provides optimal heat protection, but also reduces the transmission of engine vibrations to the arranged in the engine panel electronic components. The engine panel is therefore thermally coupled to the motor housing and optimally stored gleichzei ^¬ tig. The invention therefore provides a optima ^¬ le combination of heat and vibration protection for the electrical drive arrangement.

Preferably, opening of the engine panel at the installation location is no longer required by the detachable connection between the engine panel and the heat sink. The engine panel is in front ^¬ preferably from the motor housing and detachable the heat sink without the engine panel to be opened. In particular, devices for opening the engine panel are no longer required. This allows a space-saving arrangement and ei ^¬ ne production technology simple assembly of the electronic components within the engine panel. It can thus tig closed, whereby the penetration of moisture and dirt is largely prevented. In Ent ^¬ fernung the engine panels of the heat sink remains at the place for engine ^¬ housing. If a defect or a malfunction is reported by a central monitoring station, the motor panel can be easily replaced. The risk of interchange of internal and external wiring of the motor panel during the replacement is reduced. This is particularly in view of the Hin ^¬ limited space at the installation of the on ^¬ drive assembly in a rotor hub of a wind turbine is important.

Preferably, the heat sink is permanently connected to the Motorge ^¬ housing. Preferably, the heat sink is rigidly connected to the motor housing. For example, the heat sink is non-positively and / or positively and / or materially connected to the motor housing. In particular, the Kühlkör ^¬ is integrally formed with the motor housing. Preferably, the heat sink material forms a unit with the motor housing, or with a externa ^¬ ßeren housing wall of the motor housing.

The heat sink preferably has a motor panel facing ^¬ te support surface and is about this with the motor panel in heat-conducting contact. The bearing surface of the heat sink is preferably flat. The engine panel has be ^¬ vorzugt on a surface facing the heat sink support surface which is in particular with the bearing surface of the heat sink in heat-conductive contact ^¬. The support surface of the motor panel is preferably flat. Preferably, the on ^¬ position surface of the engine panel forms a bottom surface of the engine panel or part of it. The bottom of the engine panel is formed in particular closed.

Preferably, the motor panel consists wholly or partly of a thermally conductive material. In particular, the ^motor panel is made of a thermally conductive material at least in the region of its support surface. Preferably, the bottom of the motor panel, preferably at least in the region of its Aufla ^¬ gefläche, made of a thermally conductive material.

The frontally arranged fan assembly is advantageously independently or separately operated by the engine. This ensures that a continuous cooling air flow can be maintained at the housing even at lower engine speeds.

The fan assembly and / or the motor are advantageously detachable from the motor housing. This facilitates the assembly and disassembly of the drive assembly. In particular, the cooling or cooling device for the drive assembly is thus independent of the engine used.

The motor housing is advantageously detachably connected at its one (first) end face to the fan arrangement. At its other end, the motor housing is preferably connected to egg ^¬ nem motor flange of the engine, wherein the connection between the motor housing and the motor flange is in particular solvable. The mechanical connection Zvi ^¬ rule the motor and the motor housing and / or the mechanical support of the motor to the motor housing preferably takes place only by the connection of the motor flange to the motor housing, so that a Transmission of vibrations occurring during engine operation can be reduced to the arranged in the motor panel electronic components. Such vibrations occur, for example, upon actuation and / or release of a brake device for the motor shaft. The motor flange is preferably a radial motor flange.

The electric motor in particular comprises a motor shaft rotatable about a rotation axis, which is preferably rotatably mounted on or in the motor ^¬ flange about the rotation axis. Furthermore, the electric motor has a stator, which is preferably fixedly connected to the motor flange, and a rotor, which is preferably rotatable about the axis of rotation and in particular comprises the motor shaft. Preferably, the electric motor has a La ^¬ shield on or in which the motor shaft is rotatably mounted in the axial Ab ^¬ to the motor flange about the axis of rotation. The end shield is preferably fixedly connected to the stator verbun ^¬, up to the bearing plate extending in particular in the axial direction of the motor flange. Preferably the rotor, stator and the bearing plate are not in direct mechanical contact with the motor housing so that the over ^¬ transmission of vibrations from the engine can be reduced to the motor housing. Preferably, the electric motor is thus supported by the motor flange thus only one side of the Motorge ^¬ housing and / or suspended.

The axis of rotation of the motor shaft defines in particular the axia ^¬ le direction. The radial direction extends in particular senk ^¬ right to the axial direction. The motor housing preferably has an excellent longitudinal ^¬ direction extending especially in the axial direction or these defined. Preferably, the motor housing is designed as or substantially as a rotational body. In particular, the motor housing is hollow cylindrical or substantially hollow cylindrical.

According to a preferred embodiment of the invention, an annular space surrounding the electric motor is provided in the motor housing, through which the cooling air flow can flow. This ensures that the location of the largest heat source, namely the motor housing, is targeted and channeled, resulting in optimized cooling. The annular space is preferably closed or essentially closed, in particular with regard to its radially inner and / or radially outer circumferential surface. Preferably, however, air outlet openings are provided in the motor housing, in particular in the region of the motor flange. Preferably, the motor housing comprises at least one wall surrounding the electric motor in the radial ^distance , wherein the annular space is provided between the electric motor and the wall. The wall is preferably formed by the outer housing wall of the motor housing ge ^¬ . Preferably, the wall forms the radially outer peripheral surface of the annular space. The air outlet openings are preferably provided in the wall.

In the annular space are advantageously provided in the radial and / or in the axial direction extending webs, which form lateral boundaries of flow channels. In particular, one of the flow channels extends in each case between two adjacent ones of the webs. The flow channels preferably extend way in the axial direction. Preferably, the motor housing comprises the webs. In addition or as an alternative, however, the webs may also comprise projecting cooling ribs arranged on the outside of the motor or stator and projecting in particular radially or obliquely. According to one embodiment of the invention, the motor housing thus forms an outer, the cooling ribs abde ^¬ ckende sheath. The motor housing can thus as

Be executed fan housing.

According to one embodiment of the invention, the motor housing comprises a double wall with at a radial distance from each other to ^¬ ordered and the electric motor surrounding walls between which the annular space extends, which is preferably divided by the webs in the flow channels. Preferably, the motor housing for this purpose is designed as or at least partially as a double-walled hollow cylinder. Preferably erstre ^¬ the webs CKEN in the radial direction between the two walls. The radially outer of the walls of the double wall is preferably formed by the outer housing wall of the motor housing ge ^¬ , and the radially inner of the walls of the double wall preferably forms an inner housing wall of the motor housing. The two walls of the double wall are preferably arranged coaxially. Within the double-walled hollow cylinder or the radially inner wall of the double wall in this arrangement, in particular the stator-rotor arrangement of the electric motor is provided, preferably without the interposition of another housing. However, another housing, such as an electric motor housing, be interposed. The radially outer wall of the double wall preferably comprises or forms the radially outer circumferential surface of the annular space. The radially inner wall of the double wall comprises or forms be ^¬ preferably the radially inner peripheral surface of the annular space.

In the double-walled design of the motor housing, the radial distance between the two walls of the double wall can vary in the axial direction. Preferably, the radial distance between the two walls of the double wall reduces with increasing axial distance from the fan, so that the radial distance between the two walls in the region of the fan is preferably the largest. This special Strö ^¬ tion guide the flow-through area with increasing Ab is ^¬ stood by the fan less, but the pressure is maintained despite decreasing speed. The Aerody ^¬ namic pressure loss occurring in the annulus and between the webs in the flow of cooling air is thus held mög ^¬ lichst small. The reduction of the radial distance between the two walls of the double wall with increasing axial distance from the fan may be continuous or non-continuous. In particular, the reduction of the radial distance along one takes place in the direction of the outer

Housing wall or the radially outer wall of the double wall increasing longitudinal contour, which is preferably formed by the radially inner double wall or provided at this. The inner diameter of the outer housing wall or radially outer wall of the double wall does not change, preferably in axi ^¬ aler direction. Preferably, the Außendurchmes ^¬ ser inner housing wall or the radially inner wall of the double wall in the axial direction changes, preferably in accordance with the longitudinal contour. The heat sink is advantageously designed as a flange-like, in the axial direction extending, radial elevation with the preference ^{¬ as} flat support surface for the motor panel. The motor housing is preferably made of a thermally conductive material. In particular, the motor housing made of metal, such as steel, aluminum or gray cast iron. Furthermore, the heat sink is preferably made of a thermally conductive material. In particular, the heat sink is made of metal, such as steel, aluminum or gray cast iron. The motor housing and the heat sink may be made of different materials. Preferably, however, the motor housing and the heat sink are made of the same material. Particularly advantageously, the motor housing and the heat sink are made as a single part, preferably as a cast part, which is ^{kostengüns ¬ term} feasible. This training is particularly useful in the double-walled design of the motor housing.

Preferably, the detachable connection between the motor panel and the heat sink comprises both one or at least one me ^¬ chanical and one or at least one electrical Ver ^¬ binding. The mechanical connection advantageously has Wenig ^¬ least a screw connection and / or a plug connection and / or a snap connection. The electrical connection, which preferably has electrical connection lines between the motor panel and the electric motor, is advantageously designed as an electrical plug connection. The electrical connection preferably also includes electrical connection lines between a higher-level control device of the drive arrangement and the electric motor and / or the motor panel. The control means may comprise a supply means ^¬, preferably the electrical com- components of the drive assembly supplied with electrical power. The control device is preferably arranged remotely from the ^motor panel.

For better heat dissipation of the heat loss in the motor panel, the support surface of the motor panel and / or the Aufla ^¬ gefläche of the heat sink preferably has a thermally conductive coating on. As a thermally conductive coating, for example, thermal compound or heat conducting foil can be used.

The electronic components are preferably electrical power and / or control components. In particular ^¬ sondere include the electronic components electric capacitors and transistors, which are preferably thermally separated from each other. The separation can be realized, for example, by an insulation layer or even more advantageously by an extended spatial distance between the components, in particular between the capacitors and the transistors. The capacitors are preferably formed by electrolytic capacitors (ELKOS). The transistors are preferably power transistors. In particular, the transistors are formed by IGBTs.

The extended distance between the electronic components or the extended distance between the condensers ^¬ ren and the transistors, thus, a longer heat flow path is connected, is advantageously reali via one or at least ei ^¬ ne elevation and lowering of the bottom of the engine panels ^¬ Siert. Additionally or alternatively, the bottom of the motor panel preferably has a plurality of elevations, which are formed by a heat-conductive material and in particular to extend to the preferably flat bearing surface of the motor panel. These projections preferably form cooling elements for at least a part of the electronic components into ^¬ particular for the transistors, and are preferably in heat conductive contact therewith. The flat (planar) Aufla ^¬ gefläche the engine panels thereby enables an optimum heat transfer to the heat sink. Preferably, depressions of the motor panel floor are provided between the elevations. The elevations and / or depressions are arranged or provided in particular on the side facing away from the heat sink side of the motor panel floor. The bearing surface of the motor panel is provided in ^¬ particular on the heat sink side facing the motor panel floor. Preferably, the motor panel bottom forms a material unit with the elevations. The survey or surveys are preferably horizontal surveys. When lowering or lowering, it is preferably horizontal subsidence.

The capacitors, which can produce a great deal of heat, are advantageously provided with one or more additional cooling devices. The capacitors are preferably arranged on the side edge of the motor-panels in a pocket-shaped bulge of the motor panel base in the direction of the motor housing at ^¬. The bulge preferably serves as another heat sink at the same time. On the side edge of the engine panel, at the installation of the capacitors, additional, directed away from the side motor panel wall heatsink, for example in the form of cooling fins, may be provided. In addition, active cooling elements, such as Peltier elements or other activatable cooling elements may be provided between the heat sinks and the capacitors. An inwardly directed side edge of the bulge forms with an opposite side edge of the or one of the elevations a channel which can be used according to an embodiment of the invention for heat dissipation. This channel can be advantageously cooled with a partial air flow of the fan assembly for the motor housing. For this purpose, the Motorgehäu ^¬ se in the region of the heat sink and the capacitors preferably on a radial opening through which, if necessary via suitable order ^¬ steering elements, a partial air flow of the fan is directed outwards to the bulge and the channel in the motor panel bottom. There is thus a local convective cooling of Kondensa ^¬ tors.

In a further advantageous embodiment of the drive arrangement, a second motor panel is provided with a second heat sink, wherein both the two motor panels and the two heat sinks are preferably arranged diametrically opposite each other. The second heat sink is fixed to the motor housing, and the second motor panel is detachably connected to the second heat sink. This arrangement has the advantage that there is redundancy in case of failure of one of the engine panels. The second heat sink is for example ^¬ force-locking and / or positively and / or materially connected with the motor housing. Preferably, the second cooling body ^¬ material forms a unit with the motor housing.

The drive arrangement is preferably arranged on or in a rotor of a wind energy plant which can be rotated about a rotor axis. In particular, the rotor comprises a rotor hub and at least one rotor blade which extends along a transverse or inward direction. sentlichen transverse to the rotor axis extending blade axis of the rotor hub wegerstreckt. The rotor blade is preferably mechanically coupled to the drive arrangement according to the invention and rotatable by means of this about the blade axis. The rotor is rotatable in particular by wind power about the rotor axis.

The invention further relates to a cooling device for an electric drive arrangement according to the invention. In particular, the invention relates to a cooling device for an electric motor and electronic components for controlling and / or regulating the electric motor comprehensive electric drive assembly having a motor housing in which the electric motor is arranged, one arranged on one end face of the motor ^¬ housing and a fan comprehensive

Fan arrangement, by means of which a heat loss of the Elekt ^¬ romotors laxative cooling air flow can be generated, and at least one, the electronic components receiving, sitting on the motor housing, box-shaped motor panel, wherein by means of the motor panel during operation of the electronic ^¬ cal components resulting heat one with the motor panel in heat-conducting contact heat sink can be issued. The cooling device according to the invention can be developed according to all embodiments explained in connection with the electrical drive arrangement according to the invention. Specifically, the engine panel is removably attached to the heat sink be is ^¬ strengthens, which is preferably fixed to the motor housing ver ^¬ prevented, so that the engine panel is preferable from intermediate ^¬ circuit of the heat sink separable ver ^¬ connected to the motor housing. According to one embodiment of the invention, the electric drive arrangement according to the invention for a Blattwinkelvers- tell drive (pitch drive) of a wind turbine is provided. The invention thus also relates to a Blattwinkelverstell- drive for adjusting, particularly for the correct angle adjustment of one or more rotor blades about the respective pitch axis for a wind power plant for generating electrical ^¬ shear energy, wherein the one or more blades extending transversely to the rotor axis, and wherein the Blattwinkelverstellan- drove one, at least one or more electrical drive assemblies according to the invention comprises. The one or more rotor blades are preferably rotatable about their respective blade axis by means of the electric motor or the respective electric drive arrangement. The blade angle adjustment drive according to the invention can be developed according to all embodiments explained in connection with the electric drive arrangement according to the invention.

At angularly just adjustment means in particular, that the or the rotor blades about their respective blade axis ^¬ adjusted, ie rotated, preferably entspre ^¬ accordingly each of a predetermined angle or angle of attack.

The invention will be explained below with reference to a preferred ^{embodiment of the} invention with reference to the drawing. In the drawing show:

1 shows a schematic representation of a wind energy plant with an electric drive arrangement for blade angle adjustment of a rotor blade, 2a shows a cross section through a drive assembly according to an embodiment of the invention with attached motor panel,

FIG. 2b shows a cross section through the drive arrangement according to FIG

2a with detached motor panel,

3 shows a longitudinal section through the drive arrangement according to FIG

Fig. 2a,

Fig. 4: a detail of Fig. 2a in an enlarged view and

5 shows an alternative to that shown in FIG. 4

Condenser cooling.

From Fig. 1, a wind turbine 1 can be seen, wherein a standing on a foundation 2 Tower 3 at its end facing away from the foundation 2 with a machine house 4 is ver ^¬ prevented. In the machine house 4, a machine carrier 5 is arranged on which a rotor 6 is rotatably mounted about a rotor axis 7, which has a rotor hub 8 and associated Ro ^¬ torblätter 9 and 10, each about its blade axis 11, 12 relative to the rotor hub are rotatable. Each rotor blade 9, 10 is provided with an adjusting drive 13, 14 mechanically gekop ^¬ pelt by means of which the respective rotor blade 9, 10 to the associated blade axis 11, 12 is rotatable. The rotor 6 is coupled to me ^¬ mechanically to an electric generator 16 which is arranged in the machine housing 4 and is fixed to the machine frame 5 and the individual rotor blades we ^¬ kende wind turbine 15 into electrical energy for the most part transforms. For the controlled operation of the wind turbine 1, a wind turbine control 17 is provided, by means of which, among other things, the Versteilantriebe 13 and 14 are controlled.

Each of the Versteilantriebe 13, 14 as an essential component comprises an electrical drive arrangement 18, which is seen as a cross-sectional drawing ^¬ from FIGS. 2a and 2b, and as a longitudinal section ^¬ illustration in FIG. 3.

The drive assembly 18 includes an electric motor 19 coaxially surrounded by a motor housing 20. As seen from Fig. 3, 20 ei ^¬ ne fan assembly 22 is provided on an end face of the motor housing, which is operated independently of the engine 19 and is not associated with the motor shaft 21. This ensures that the required cooling ^¬ effect for the drive assembly 18 is maintained even at low speed of the motor shaft 21. A generated by the fan 23 of the fan assembly 22 cooling air flow dissipates the heat loss of the motor 19 via the motor housing 20. The cooling air flow is represented by the arrow 53 and can flow in the direction or in the opposite direction of this arrow. According to the embodiment, the cooling air flow but flows in the direction of arrow 53. In the region of the fan 23 remote from the end of the motor housing 20 Austrittsöffnun ^¬ gen 63 are provided, through which the cooling air flow 53 exits the motor housing 20. The fan assembly 22 and the motor 19 are arranged separately from each other. The motor 19 is inserted into the motor housing 20 and in particular interchangeable, so that the motor 19 for disassembly out of the housing 20 can be pushed out. The motor housing 20 thus preferably forms a fan housing.

The motor housing 20 is in the illustration of Fig. 2a and Fig. 2b designed as a double-walled hollow cylinder with radially spaced-apart walls 24 and 25, wherein the wall 24 forms an outer housing wall and the wall 25 an inner housing wall. Between the two Wan ^¬ applications 24 and 25 extending in the radial direction and in the axial direction webs 26 are provided, which are inclined relative to the radial direction. By the webs 26 of the annular space 60 between the walls 24 and 25 is divided into a plurality of flow channels 27, wherein each two adjacent of the webs 26 form side boundaries for one of the flow channels 27. The angle of inclination of the fins 26 relative to the radial direction opposite to the direction of rotation of the fan 23, so that the Zirku ^{¬-regulating} by the rotation of the fan 23, air can be optimally introduced into the flow channels 27th

From Fig. 3 it can be seen that the radial distance between the two walls 23, 24 of the housing 20 changes in the axial direction. In the area of the fan arrangement 22, the radial distance has its greatest value, in order then, following a radially increasing longitudinal contour 28 of the inner housing wall 25, to assume its smallest value on the motor flange 29 of the opposite end face of the drive arrangement 18. Due to this special flow-guiding the flow-through area becomes smaller with increasing distance from the fan 23, wherein the pressure, in particular with decreasing Strömungsge ^¬ speed remains substantially maintained. Of the aerodynamic pressure loss, which occurs during the flow of cooling air in the flow channels 27, is thus kept as small as possible.

For the electrical control and / or regulation as well as the energy supply of the drive arrangement 18, electronic power and control components 33 are provided, which are arranged in a switch box 30, which is referred to below as a motor panel. As shown particularly in Fig. 2a ersicht ^¬ Lich, the motor panel 30 is seated on the outer housing wall 24 of the housing 20, on a support surface 31 ei ^¬ nes heat sink 32 for dissipating the heat generated during operation of the Elect ^¬ ronikbauelemente 33rd To improve the heat transfer between the motor panel 30 and the heat sink 32 whose bearing surface 31 is preferably provided with a heat ^¬ conductive coating 51, which may be formed for example by a thermal paste or a heat conducting foil. The heat sink 32 is permanently fixedly connected to the housing 20. According to the embodiment, the heat sink 32 is an integral part of the housing 20 and forms a flange, in the axial direction of the housing 20 extending, radial elevation with the flat support surface 31 for the motor panel 30th ,

As can be seen from FIG. 2 b, the motor panel 30 is mechanically detachable from the heat sink 32, wherein the connection between the motor panel 30 and the heat sink 32 is formed by a detachable screw connection 34. Alternatively or additionally, however, the connection can also be formed by mechanical plug-in and / or snap-in connections. The motor 19 comprises a motor flange 29, a bearing plate 38, a stator 61 and a rotor 62 with a motor shaft 21 which is rotatably mounted on the bearing plate 38 at a bearing 36 and on the motor flange 29 at a bearing 37 about a rotation axis 57. The stator 61 extends in axi ^¬ aler direction between the motor flange 29 and the end plate 38 and is fixedly connected both to the motor flange 29 and to the bearing plate 38. In this case, the bearing plate 38 is arranged on one of the fan assembly 22 facing the front side of the motor 19 and stator 61, at the other

End face of the motor flange 29 is arranged. The rotation axis 57 of the motor shaft 21 defines the axial direction x. The ra ^¬ Diale direction perpendicular to the axial direction.

The motor housing 20 is at its first end face to the fan assembly 22 and at its other end face to the motor flange 29 of the motor 19 in particular detachably connected. In this case, the motor 19 is mechanically connected only via the connection between the motor housing 20 and the motor flange 29 with the motor housing 20 or mounted on this, so that neither the stator 61 nor the bearing plate 38 have a di ^¬ direct contact with the motor housing 20.

The electrical connection between the motor-panel 30 and the motor 19 is provided as a electrical connector 35 reali ^¬ Siert. In Fig. 3, this plug connection 35 is provided in the region of the motor flange 29. This connection also includes the connection to a superordinate and only schematically indicated control and regulating device 54, which is preferably formed by the wind turbine control 17. The motor panel 30 is closed by a lid 39, are arranged on the cooling ^¬ ribs. In particular, motor panel 30 is closed on all sides. By a arranged between the box-shaped engine panel 30 and its lid 39 seal 40, the penetration of moisture and dirt is largely prevented. The panel 30 is thus to be considered a "black box", which is exchanged in the event of functional ^errors or failure.

Due to the detachable connection to the housing 20, opening of the motor panel 30 is no longer necessary. As a result, the assembly of the electronic components 33 can be made very compact and cost-effective, without taking into account the accessibility in case of malfunction. As ersicht ^¬ Lich of FIG. 2a, the components 33 are located inverted on a board 41. In particular, the components 33 are in advance applied automatically on the printed circuit board, which then inver ^¬ advantage is inserted into the motor-panel 30th Preferably, the components 33 are arranged on a plurality of parallel superposed boards.

The electronic components 33 comprise, in particular Tran ^¬ sistoren 42, which are designed as IGBTs, and condensate ^¬ capacitors 43, referred to herein as electrolytic capacitors (ELKOS) are formed, in particular the latter have a high heat ^¬ loss during operation and therefore additional Kühlvor ^¬ appropriate directions. The bottom 59 of the engine panel 30 is not flat, but has on its side facing away from the heat sink 32, ie within the engine panel 30, Absen ^¬ kungen 58 and elevations 50, the elevations 50 from a thermally conductive and / or heat-absorbable material 45 exist. On its side facing the heat sink 32, the bottom 59 has a flat support surface 44, which is heat-conductively connected to the flat support surface 31 of the heat sink 32. According to the embodiment, the projections 50 form a material unit with the ground 59, so that the Bo ^¬ 59 is the material from the 45th The elevations 50 are arranged directly below the transistors 42, which are preferably in heat-conducting contact with the elevations 50, so that the heat loss of the transistors 42 is conducted via the material 45 onto the heat sink 32.

Fig. 4 shows a detailed representation of the right margin of FIG. 2a or 2b, that the electronic control devices 33 performance- and thermally from each other are ge ^¬ separates. The separation takes place over an extended spatial distance between the capacitors 43 and the transistors 42, within which distance the bottom 59 has a horizontal elevation 55. The elongated cavities ^¬ Liche distance is illustrated by the arrow 56th For the capacitors 43, an additional separate cooling is provided due to their high heat loss. The capacitors 43 are arranged on the right side edge of the motor panel 30 in a downwardly directed, pocket-shaped recess 48 of the motor panel floor 59. The bulge 48 serves not only for receiving the capacitors 43, but also for passive cooling thereof and thus forms an additional separate cooling device for the capacitors 43. The cooling effect is enhanced by protruding cooling fins 46 on the side edge of the motor panel 30, which of the additional sepa ^{¬ rate} cooling device can be attributed. The horizontal Lifting 55 is provided between the bulge 48 and the support surface 44, over which the elevations 50 are arranged. Furthermore, the elevation 55 adjoins one of the depressions 58.

The cooling of the capacitors 43, as shown in Fig. 2a, additionally or alternatively, depending on the resulting heat loss, via a diverted partial air flow 64 of the fan assembly 22 of the motor 19. The outer one

Housing wall 24 of the motor housing 20 has for this purpose a radial opening 47 in the region of the heat sink 32 and the bulge 48 and the capacitors 43. The opening 47 opens into the annular space 60, in particular into one of the flow channels 27, so that a partial air flow 64 can be diverted from the cooling air flow 53. Side walls of the bulge 48 and the horizontal elevation 55 define an open to the motor housing 20 and extending in the axial direction channel 49, in which the emerging from the opening 47 partial air flow 64 is introduced and thus dissipates heat loss of the capacitors 43.

5 shows an alternative embodiment for additional cooling of the capacitors 43 via active cooling elements 52, which are provided in the lateral outer wall of the motor panel 30 between the mounting of the capacitors 43 and the laterally projecting cooling fins 46. The active cooling elements 52 may comprise, for example, Peltier elements. Reference sign list

1 wind energy plant

2 foundation

3 tower

4 machine house

5 machine carriers

6 rotor

7 rotor axis

8 rotor hub

9 rotor blade

10 rotor blade

11 leaf axis

12 leaf axis

13 adjustment drive

14 adjustment drive

15 wind power

16 generator

17 wind turbine control

18 drive arrangement

19 electric motor

20 housing

21 motor shaft

22 fan arrangement

23 fans

24 outer housing wall

25 inner housing wall

26 footbridge

27 flow channel

28 longitudinal contour

29 motor flange Engine panel

bearing surface

heatsink

Electronic Components

screw

electrical plug connection

depository

end shield

cover

poetry

circuit board

Transistor (IGBT)

Capacitor (ELKO)

bearing surface

thermally conductive material

cooling fins

radial opening

bulge

channel

survey

thermally conductive coating

cooling element

Cooling air flow

Control and regulating device

horizontal elevation of floor area arrow

Rotary axis of the motor shaft

lowering

Bottom of the engine panel

annulus Stator of the engine

Runner of the engine

Outlet opening for the cooling air flow Partial air flow

axial direction

Claims

Electrical Antriebsanordung claims

1. Electric drive assembly with

an electric motor (19) arranged in a motor housing (20),

- is arrange one on a front side of the motor housing (20) ^¬ th and a fan (23) comprising the fan assembly (22), by means of which is produced a heat loss of the electric motor (19) from ^¬ leading cooling air flow (53),

- Electronic components (33), by means of which the

Electric motor (19) is controllable or adjustable,

at least one box-shaped motor panel (30) ^receiving the electronic components (33) and seated on the motor housing (20),

characterized in that

By means of the motor panel (30) during operation of the electronic components (33) resulting heat to a with the motor panel (30) in heat-conducting contact heat sink (32) can be dispensed.

2. Electrical drive arrangement according to claim 1,

characterized in that

the motor panel (30) is detachably secured to the heat sink (32) fixedly connected to the motor housing (20) so that the motor panel (30) with the interposition of the heat sink (32) separably connected to the motor housing (20).

3. Electrical drive arrangement according to claim 1 or 2, characterized in that

the motor panel (30) is closed on all sides, so that penetration of moisture and dirt in the motor panel (30) is largely prevented.

4. Electrical drive arrangement according to one of the preceding claims,

characterized in that

the fan assembly (22) is operable separately from the electric motor (19) and detachable from the motor housing (20).

5. Electrical drive arrangement according to one of the preceding claims,

characterized in that

the motor housing (20) is releasably connected at its one end face to the fan arrangement (22) and at its other end faces to a motor flange (29) of the electric motor (19).

6. Electrical drive arrangement according to one of the preceding claims,

characterized in that

in the motor housing (20) an electric motor (19) surrounding annular space (60) is provided, which is flowed through by the cooling air flow (53).

7. Electrical drive arrangement according to claim 6, characterized in that

the motor housing (20) forms a shell of on the outside of the electric motor (19) arranged, projecting cooling fins of the motor (19).

8. Electrical drive arrangement according to claim 6 or 7, characterized in that

the motor housing (20) has a double wall with radially spaced-apart and the electric motor (19) surrounding walls (24, 25), between which the annular space (6) extends.

9. Electrical drive arrangement according to one of claims 6 to 8,

characterized in that

in the annular space (60) in the radial and in the axial direction extending webs (26) are provided, the lateral Be ^¬ boundaries of flow channels (27) form.

10. Electric drive arrangement according to claim 9,

characterized in that

the webs (26) curved or inclined with respect to the radial direction.

11. Electrical drive arrangement according to claim 9 or 10, characterized in that

the radial extent of the webs (26) decreases with increasing axial distance to the fan assembly (22).

12. Electric drive arrangement according to one of the preceding claims, characterized in that

the heat sink (32) as a flange, in the axial direction of the housing (20) extending, radial projection is designed with ei ^¬ ner flat surface which forms a support surface (31) for the motor panel (30).

13. Electrical drive arrangement according to one of the preceding claims,

characterized in that

the heat sink (32) with an outer housing wall (24) of the motor housing (20) forms a unit of material.

14. Electrical drive arrangement according to one of the preceding claims,

characterized in that

the motor panel (30) is connected to the heat sink (32) both mecha ^¬ nically and electrically separable.

15. Electrical drive arrangement according to claim 14,

characterized in that

the separable mechanical connection comprises a screw connection (34) or a plug-in and snap-in connection.

16. Electrical drive arrangement according to claim 14 or 15, characterized in that

the disconnectable electrical connection (35) includes both a Verbin ^¬ connection between the motor panel (30) and the motor housing (20) and a connection to a remotely located, the higher-level control device (54).

17. Electrical drive arrangement according to one of the preceding claims,

characterized in that

a motor with the panel (30) are in thermally conductive contact ^¬ de support surface (31) of the cooling body (32) has a wärmeleitfä- hige coating (51).

18. Electrical drive arrangement according to one of the preceding claims,

characterized in that

the electronic components (33) comprise electrical capacitors (43) and transistors (42) which are thermally separated from one another.

19. Electric drive arrangement according to claim 18,

characterized in that

the thermal separation over a prolonged spatial distance between the capacitors (43) and the transistors

(42).

20. Electrical drive arrangement according to claim 18 or 19, characterized in that

the capacitors (43) in a directed to the motor-panel-side edge at ^¬ parent, to the motor housing (20), taschenförmi- gen bulge (48) of the motor panel base (59) are arranged, which as an additional heat sink for the capacitors

(43) is provided.

21. Electric drive arrangement according to claim 20,

characterized in that in the pocket-shaped bulge (48) active cooling elements (52) on the outside of the side wall of the motor panel (30) in the region of the storage of the capacitors (43) are provided.

22. Electric drive arrangement according to one of claims 18 to 21,

characterized in that

the cooling of the capacitors (43) additionally or alternatively by a partial flow of the cooling air flow (53) of the

Fan arrangement (22) takes place.

23. Electrical drive arrangement according to claim 22,

characterized in that

the diversion of the partial air flow from the cooling air flow (53) through a radial outlet opening (47) in the outer

Housing wall (24) of the motor housing (20) in the region of the cooling ^¬ body (32), wherein the partial air flow is passed into a channel (49) through side walls of the pocket-like recess (48) and a survey (55) of the housing Panel floor (59) is limited.

24. Electric drive arrangement according to one of the preceding claims,

characterized in that

the bottom (59) of the engine panel (30) has protrusions (50) formed by a thermally conductive material (45) and extending to a flat support surface (44) of the engine panel (30).

25. An electric drive arrangement according to any preceding claim,

marked by

a fixed to the motor housing (20) connected second

Heatsink and a thermally conductive and detachably connected thereto second motor panel, both the two motor panel and the two heatsink are each arranged diametrically opposite each other.

26. A cooling device for an electric motor (19) and electronic components (33) for controlling and / or Rege ^¬ development of the electric motor (19) comprising electric drive ^¬ assembly (18), with

- a motor housing (20), in which the electric motor (19) is integrally arranged ^¬,

- One on a front side of the motor housing (20) ^{angeordne ¬} th and a fan (23) comprehensive fan assembly (22) by means of which a heat loss of the electric motor (19) from ^¬ leading cooling air flow (53) can be generated, and

- at least one, the electronic components (33) seated on ^¬ receiving, on the motor housing (20), box-shaped engine-panel (30),

characterized in that

27. Cooling device according to claim 26,

characterized in that the motor panel (30) is releasably attached to the heat sink (32) fixedly connected to the motor housing (20), so that the motor panel (30) with the interposition of the heat sink (32) separable with the motor housing (20) connected is.

28. Blattwinkelverstellantrieb for adjusting one or more rotor blades (9,10) to the respective blade axis (7, 8) for a wind turbine (1) for generating electrical energy, wherein the rotor blades (9,10) transversely to the rotor axis (11, 12 ),

marked by

An electric drive arrangement (18) according to any one of claims 1 to 25.