Drive with a motor-integrated converter and a hybrid end plate

Abstract

The invention relates to a drive (30) comprising - at least one dynamo-electric rotary machine (1) which is arranged in a housing (2) and has a winding system (5) arranged in a stator (4) and a rotor (6) separated therefrom by an air gap (23), the rotor being rotatably mounted about an axis (12) via at least one bearing (10) of a B-side cup-shaped end plate (7), - at least one converter, the converter having, in a construction volume, at least some of the following components, such as power semiconductors, chokes, capacitors, open-loop and closed-loop control units and communication units, which components are radially surrounded, at least in sections, by the B-side end plate (7) and at least some components of the converter are thermally conductively connected to the end plate (7), in particular by heat-generating components (13) of the converter being arranged on an inner side (20) of the side wall (19) of the cup-shaped end plate (7), - wherein, when viewed axially, the converter is arranged between the dynamo-electric rotary machine (1) and the bearing of the B-side cup-shaped end plate (7).

Description

[0001] Description

[0002] Drive with a motor-integrated inverter and a hybrid bearing shield

[0003] The invention relates to a drive with a dynamo-electric machine and a converter, which are arranged axially one behind the other in an interior space of the dynamo-electric machine, wherein the drive is designed as a motor-integrated converter.

[0004] For variable-speed dynamoelectric machines, such as electric motors, especially synchronous, asynchronous, and reluctance motors, inverters are needed to adjust the desired operating behavior of the machine.

[0005] Operating these drives generates waste heat inside the machine and the inverter, which usually has to be dissipated, among other things, via their housing.

[0006] These required inverters are usually housed in separate control cabinets or mounted externally on the housing of the dynamo-electric machine. There are various ways to mount the inverter on the housing, for example, as an add-on with its own ventilation or with integrated ventilation provided by an existing motor fan.

[0007] Currently, the power electronics of an inverter are predominantly mounted externally on the motor in a separate housing. These housings also have their own ventilation. Alternatively, the inverter can be thermally decoupled from the motor in its own control cabinet. However, adequate cooling is still essential in this case as well. For drives with a motor-inverter system that have high efficiency requirements, effective cooling and heat dissipation are absolutely necessary.

[0008] Such a drive is known, for example, from DE 198 12 729 A1. This patent describes an electric motor, in particular with a fan wheel to form an axial or radial fan. This drive unit has a control housing with a control unit, wherein the drive unit comprises a stator, a rotor, and at least one electrical coil, and wherein the control unit has an electronic circuit for controlling or regulating the current supply to the coil. The drive unit and the control unit are formed by modules, and corresponding contact elements are provided for mutual electrical connection.

[0009] A similar arrangement is also known from DE 38 42 588 A1. This document describes a brushless DC external rotor motor consisting of a stator with stator windings attached to a motor flange, an external rotor enclosing the stator on its side facing away from the motor flange, and an electronic circuit arrangement controlling the stator windings. This circuit arrangement has a printed circuit board (PCB) facing the stator on the flange side, carrying electronic components, and several power semiconductors electrically connected to the PCB and in thermally conductive contact with the motor flange. The power semiconductors are indirectly thermally connected to the motor flange via an annular heat sink.

[0010] These designs of mounting directly on the motor require a comparatively large amount of installation space, making the drive large and heavy, and exhibit insufficient cooling, especially for some components of the inverter. Based on this, the invention aims to create a compact, simply constructed drive for diverse applications with improved cooling performance.

[0011] The problem can be solved by a drive that meets the characteristics of an independent claim.

[0012] Advantageous configurations can be found in the dependent claims.

[0013] According to the invention, the drive is equipped with at least one dynamoelectric rotary machine, a synchronous machine, an asynchronous machine, or a reluctance machine, which is arranged in a housing. A stator, shrunk or pressed into the housing, has a winding system in its substantially axially extending slots, which, when energized by a rotor separated by an air gap, generates a torque due to electromagnetic interactions.

[0014] This stator fit creates a comparatively good heat transfer from the stator's laminated core to the housing and optional housing fins or cooling fins. The rotor is rotatably mounted about its axis via at least one bearing of a B-side, pot-shaped bearing shield.

[0015] In a dynamo-electric machine, such as a motor, there is an A-side (drive end; DE side), one end of which is connected to shaft-mounted components, such as drive elements and / or a driven machine, and is mechanically coupled to this driven machine. Examples of driven machines include compressors, fans, pumps, and other similar devices. The B-side of the motor is located at the other end of the shaft (non-drive end; NDE side). Furthermore, the drive includes at least one converter, which, depending on the design (DC converter, direct converter, etc.), comprises at least some of the following components, such as power semiconductors, inductors, capacitors, control units, and communication units.

[0016] At least the B-side end shield is pot-shaped, with the side wall being made of a different material than the base of this end shield. The side wall is made of a material with comparatively good thermal conductivity, or at least a material with better thermal conductivity than the base of the end shield. At least some components of the inverter are at least partially surrounded by the side wall of the B-side end shield and thermally connected to this side wall. It is particularly advantageous if the heat-intensive components of the inverter, such as the power electronics, are located on the inside of the side wall of the pot-shaped end shield.

[0017] This B-side bearing shield is therefore designed as a hybrid bearing shield, the parts of which, such as the side wall and pot base, are optimally adapted to the respective requirements. The side wall is preferably made of extruded aluminum and the pot base of die-cast aluminum.

[0018] The hybrid bearing shield thus features ribs on the outside of its side wall for cooling and geometries on the inside of its side wall for mounting and thermally connecting the power electronics. The bottom of the B-side bearing shield, and especially the hub area, is made of die-cast aluminum for mounting additional electronic components of the inverter and serves as a bearing hub for the B-side bearing. By using a hybrid bearing shield, the best properties of the materials can be utilized in the appropriate locations, particularly on the B-side bearing shield.

[0019] If the power electronics are integrated into the end shield, the components with the highest losses must be cooled most effectively. These components, especially IGBTs, are therefore thermally connected to the comparatively well-conducting side wall of the B-side end shield. The outer surface of the side wall, in conjunction with air cooling and / or cooling fins, thus cools the power electronics.

[0020] The side wall of the B-side bearing shield is made of extruded aluminum and has a thermal conductivity of 200-220 W / mK. The base, particularly the hub area of ​​the B-side bearing shield, is made of die-cast aluminum, which provides the necessary strength and allows for various required geometries for the bearing housing and the inverter's control components. The side wall therefore has a thermal conductivity 100 W / mK higher than the cast aluminum in the hub area or base of the B-side bearing shield.

[0021] Both parts of the B-side end shield, namely the side wall and the base, are pre-assembled. Preferably, the inverter components are already mounted on the side walls or the base of the B-side end shield, so that after this pre-assembly, the assembled B-side end shield can be mounted to the B-side of the dynamo-electric machine. This assembly also simultaneously establishes the electrical connection of the inverter to the stator winding system via suitable contact connections. This joining of the side wall and base can be achieved by welding, gluing, screwing, shrinking, or direct casting. Compared to cast aluminum (120 W / mK), the extruded aluminum of the side wall has a conductivity 100 W / mK higher.

[0022] The extrusion process of the side wall allows for very delicate cooling fins (fin thickness approx. 1 mm). This increases the thermally active surface area and thus contributes to improved cooling of the thermally connected components on the inside of the side wall.

[0023] If machining of the B-side bearing shield (e.g., bearing seat, etc.) is necessary, the entire B-side bearing shield can be machined in a single setup. This is possible because the two bearing shield components—side wall and cup base—are already joined together in their raw state. This results in improved overall quality and lower manufacturing costs for the dynamo-electric machine.

[0024] The inverter's power semiconductors, such as IGBTs, which are particularly heat-intensive components, are in direct thermal contact with the B-side end shield, which resembles the side wall of the pot-shaped end shield. This provides direct thermal coupling to the side walls of the pot-shaped end shield, thus facilitating heat dissipation from the inverter, especially via the side wall, which has a comparatively good thermal conductivity.

[0025] Thermal integration of the inverter's power semiconductors, such as IGBTs, is achieved by arranging them in axially extending, tangentially aligned pockets on the inner side wall of the cup-shaped end shield. Additionally or alternatively, thermal integration of the inverter's power semiconductors with the inner side wall of the end shield can be improved by using a thermally conductive potting compound.

[0026] The converter is arranged axially between the dynamoelectric rotary machine and the bearing of the B-side pot-shaped bearing shield.

[0027] Using a continuous casting process, the side wall of the bearing shield can be provided with various geometries on the inside and / or outside, such as flat surfaces or pockets, allowing, among other things, the IGBTs to be attached to the inside without additional screws. This can be achieved by clipping, clamping, or inserting the IGBTs into a conical groove in the pocket or similar mechanism. For further fixation and improved heat dissipation, the IGBTs are optionally encapsulated or bonded with a special thermally conductive resin.

[0028] An optional additional fan unit, designed for self- and / or external ventilation, which creates an airflow, at least partially, around the bearing shield and / or the housing, further improves the required cooling effect. This fan unit can be mounted axially on the NDE side.

[0029] Axially and / or radially oriented cooling fins on the bearing shield (cup base and / or side wall) and / or housing of the dynamo-electric rotary machine increase the cooling efficiency of the drive. These cooling fins on the outside of the side wall of the B-side bearing shield thus ensure very good cooling, especially of the components thermally coupled to the side wall. The cooling fins are ideally positioned in the cooling airflow of the fan unit and thus ensure highly efficient dissipation, particularly of the energy losses generated by the inverter.

[0030] The axially extending cooling fins of the bearing shield and housing are either aligned axially or offset by a predetermined angular offset to improve cooling performance, depending on the design. A significant offset of the cooling fins of the housing and bearing shield by approximately half the distance between two housing fins increases turbulence in the airflow, resulting, among other things, in a turbulent flow that improves cooling.

[0031] This allows all the particularly lossy power electronics to be mounted directly on the inside of the side wall. Less lossy components, such as sensors or communication devices, can also be mounted on the bottom of the housing. By integrating the power electronics into the bearing shield and thus into the engine compartment, the invention combines many functions (bearing housing, fixing the power and control electronics, etc.) and thus optimally utilizes the available space in the engine compartment.

[0032] In addition, mounting threads can also be incorporated, especially in the base of the bearing shield, to attach further modular attachments, such as sensor devices and / or communication devices.

[0033] The bearing on the NDE side, in particular a ball bearing, can thus be easily mounted axially from the outside or removed during a bearing replacement, according to the invention. This also allows for very good replaceability in case of failure, without having to disconnect the motor from the driven machine on the A side and / or remove the inverter.

[0034] The inverter, or rather its housing, features a central shaft passage within the bearing shield. The inverter's power electronics can be positioned relatively close to the shaft (motor shaft diameter + 1 mm = shaft passage in the inverter), as a comparatively large bearing passage is not required, as is usually the case. This creates additional installation space for inverter components within the bearing shield, resulting in a motor-inverter system that is even more compact, especially axially.

[0035] It is also conceivable that, in the case of a detachable connection between the pot base and the side wall, only the pot base needs to be removed for maintenance purposes.

[0036] According to the invention, the end shield thus features functional integration, including power electronics, within the motor's interior. The inverter components do not require a separate housing because all mounting points are integrated into the B-side end shield. This optimizes the use of the motor's installation space and results in a drive with a compact motor-inverter system.

[0037] There is no restriction on a modular design on the NDE (non-displacement end) side of the motor; that is, all conceivable attachments to the NDE shaft end, such as a brake, integrated fan, external fan, or a encoder, such as a rotary encoder, remain possible. This converter system connects to the mains voltage via its input converter and a terminal block in the motor's terminal box, while the output side of the converter system is connected to the motor's winding system. These connections are preferably made when the end shield is mounted to the housing.

[0038] The B-side bearing shield, as described above, is essentially pot-shaped. The base of the cup has a recess through which the shaft protrudes, which can, among other things, form the drive shaft of the cooling unit, particularly a fan. The attachments mentioned above can also be mounted to this shaft in a rotationally fixed manner. The side wall has axially extending ribs along its entire outer surface. The inner surface of the side wall of the pot-shaped bearing shield is preferably polygonal to provide a flat contact surface for the power semiconductors, allowing them to be easily positioned as close as possible to the heat sink. This ensures a comparatively good thermal connection of these components to the side wall of the bearing shield.

[0039] Depending on the design, the converter system thus includes power semiconductors, chokes, capacitors, control and regulation units, and communication units, all housed within the specified installation volume. Preferably, the major heat sources, such as the power semiconductors of the input and output converters, are thermally coupled to the inner side wall of the pot-shaped, B-sided end shield with a comparatively low thermal resistance.

[0040] The stator also generates heat, which, among other things, heats the interior of the rotary dynamo-electric machine. This heat input is also dissipated by the air flowing around the housing and the bearing shields. Furthermore, the stator is preferably shrink-wrapped into a casing of the housing to achieve comparatively good heat transfer from the stator's laminated core to the housing and the housing fins.

[0041] A cooling unit, designed specifically as an intrinsic fan, generates a cooling airflow during operation of the dynamo-electric rotary machine. This airflow is initially directed radially along the bottom of the bearing shield and then along the outer side wall of the bearing shield. A fan shroud, extending axially towards bearing A, also directs the cooling airflow along the cooling fins of the bearing shield on the B side and the housing of the dynamo-electric rotary machine.

[0042] The invention and further advantageous embodiments of the invention are described in more detail by means of exemplary embodiments shown in principle; therein:

[0043] FIG 1 a perspective view of the motor-integrated inverter ,

[0044] FIG 2 shows a basic longitudinal section of the motor-integrated inverter with hybrid bearing shield,

[0045] FIG 3 shows a cross-section of the hybrid bearing shield ,

[0046] FIG 4 shows a basic longitudinal section of the hybrid bearing shield.

[0047] It should be noted that terms such as "axial", "radial", "tangential", etc., refer to the axis 12 used in the respective figure or example described. In other words, the directions axial, radial, and tangential always refer to an axis 12 of the rotor 6 and thus to the corresponding axis of symmetry of the stator 4. "Axial" describes a direction parallel to the axis 12, "radial" describes a direction orthogonal to the axis 12, either towards or away from it, and "tangential" is a direction that is circular around the axis 12 at a constant radial distance and with a constant axial position. The expression "circumferential" is synonymous with "tangential".

[0048] With regard to a surface, e.g. a cross-sectional area, the terms "axial", "radial", "tangential", etc. describe the orientation of the normal vector of the surface, i.e. the vector that is perpendicular to the surface in question.

[0049] The term "coaxial components," e.g., coaxial components such as rotor 6 and stator 4, refers here to components that have the same normal vectors, meaning that the planes defined by the coaxial components are parallel to each other. Furthermore, the term implies that the centers of coaxial components lie on the same axis of rotation or symmetry. However, these centers may be located at different axial positions on this axis, and the planes in question may therefore have a distance greater than zero from each other. The term does not necessarily require that coaxial components have the same radius.

[0050] The term "complementary," in the context of two components that are complementary to each other, means that their external forms are designed such that one component can preferably be completely enclosed within its complementary component, so that the inner surface of one component and the outer surface of the other ideally touch without gaps or across their entire surface. Consequently, in the case of two complementary objects, the external form of one object is determined by the external form of the other. The term "complementary" could be replaced by the term "inverse."

[0051] For the sake of clarity, in some cases where components are present multiple times, not all components shown in the figures are provided with reference symbols.

[0052] The described embodiments can be combined in any way desired. Likewise, individual features of the respective embodiments can also be combined without departing from the essence of the invention.

[0053] FIG. 1 shows a perspective view of a drive 30 with a motor-integrated inverter, in which the bearing housing of one bearing 10 is tubular in shape on the cup base 22 of the bearing shield 7. The shaft 8 protrudes from the drive 30 on both the A-side and the B-side, as can also be seen particularly in FIG. 2. A driven machine (not shown in detail), such as a compressor or a pump, can be connected to the A-side. Modular attachments (not shown in detail), such as a brake unit, an external fan module, or an encoder or rotary encoder, can be mounted on the B-side.

[0054] FIG. 2 shows a longitudinal section of the drive 30 with a dynamo-electric rotary machine 1 and a converter. The dynamo-electric rotary machine 1 has a stator 4, which forms a laminated core from axially stacked laminations. A winding system 5, facing an air gap 23, is arranged in substantially axially extending grooves of the stator core 4, forming winding heads at the end faces of the stator core 4. A rotor core 6 is rotationally fixed to a shaft 8 and is in electromagnetic interaction with the energized winding system 5 of the stator 4, thus causing the shaft 8 to rotate about an axis 12. The shaft 8 is rotatably mounted in two bearings 10 and 31, an AS bearing 31 and a BS bearing 10.

[0055] The rotor 6 can be designed as an asynchronous rotor, a permanent magnet rotor or a reluctance rotor.

[0056] The dynamoelectric rotary machine 1 is enclosed in a housing 2, which is bounded at its end faces by bearing shields. The B-side bearing 10 is held by its B-side cup-shaped bearing shield 7. The housing 2 and the B-side cup-shaped hybrid bearing shield 7 have axially extending cooling fins 33, 11 on their outer circumference.

[0057] The B-side end shield 7 is mechanically connected to the housing 2 of the dynamoelectric rotary machine 1 via its side wall 19 and the base 22 by means of fastening elements 32. A converter supplying the dynamoelectric rotary machine 1, with components such as power semiconductors, inductors, capacitors, control units 14, and communication units, is housed within the volume of the end shield 7. The relevant components of the converter are connected to a terminal box 3 or to the winding system 5 via contact elements 7, 15.

[0058] Wiring of power or control electronics 14 is preferably implemented via the terminal box 3.

[0059] The inverter and its components are fixedly mounted on the inside 20 of the side wall and / or on the bottom of the housing and have a shaft passage 9 that is only approximately 1 mm away from the shaft 8. For this reason, the B-bearing 10 is located on the bottom 22 of the housing 7. This makes bearing replacement easier while simultaneously maximizing the installation volume within the hybrid housing 7.

[0060] Within the hybrid bearing shield 7, the components of the converter that require more intensive cooling, such as the power electronics, are thermally coupled to the inside 20 of the side wall 19 of the bearing shield 7.

[0061] The bearing receptacle 24 of the bearing 10 is designed in a tubular shape in this version, which facilitates the disassembly of the bearing 10.

[0062] The inverter arranged in the hybrid bearing shield 7 thus forms a pre-assembled unit which only needs to be electrically contacted with the winding system 5 and with the terminal box 3.

[0063] The cup base 22 of the B-side bearing shield 7 is shown in FIGS. 2 and 3 as being rather flat; it can also be completely smooth, i.e., in a plane perpendicular to the axis 12. It is also possible for the cup base 22 to be designed as a partially open torus.

[0064] The tubular bearing receptacle 24 and the cup base 22 of the bearing shield 7 are formed in one piece. The cooling fins 11 on the outer surface 21 of the side wall 19 are arranged parallel in sections and, due to the manufacturing process – continuous casting – are also formed in one piece with the side wall 19.

[0065] FIG. 3 shows a cross-section of the drive 30 in the area of ​​the bearing shield 7. In addition to the shaft passage 9 in the bearing shield 7, flat surfaces 25 can also be seen on the – in this case – polygonal inner side 20 of the side wall 19 of the bearing shield 7, to which the power semiconductors 13 of the converter are arranged. There, the power semiconductors 13 of the converter can be thermally coupled particularly easily and efficiently.

[0066] The flat surfaces 25 are provided on the inner side 19 of the side wall 20 of the bearing shield 7, as shown in FIG. 3. The number of these flat surfaces 25 depends on the number of power semiconductors or the number of heat-intensive heat sources and simplifies the thermal connection.

[0067] An internal or external fan can be provided axially on the B-side of the drive 30, generating a cooling airflow that is guided through an optional fan shroud. The airflow is fed to a fan via an intake opening in the shroud in the region of the B-side shaft end and guided axially over the cooling fins 11, 33 of the side wall 19 and / or the housing 2.

[0068] The side wall 19 of the hybrid end shield 7, particularly on the B-side, is made of a thermally conductive material, so that the heat loss from the inverter components, especially the power semiconductors, such as the IGBTs 16, can be dissipated at the flat surfaces 25 to the outer surface 21 of the side wall 20 and / or a cooling airflow. Additional cooling fins 33, 11 on the housing 2 and / or on the outer surface 21 of the side wall 20 of the end shield 7 increase the heat dissipation effect, especially if a fan shroud directs the cooling airflow.

[0069] Advantageously, the cooling fins 11 of the side wall 19 of the bearing shield 7 and the cooling fins 33 of the housing 2 of the dynamo-electric rotary machine 1 are axially aligned in order to offer as little resistance as possible to the flow of cooling air. Cooling of the drive 30 and its respective sections / parts / components is provided by one or more cooling units, which can also be implemented as liquid cooling (cooling jacket on the housing 2 of the dynamo-electric rotary machine 1 and / or on the bearing shield 7).

[0070] It is also possible to provide one or more internal fans within the pot-shaped hybrid bearing shield 7, which rotate within the housing volume of the hybrid bearing shield 7 and create air turbulence, thus providing additional cooling to the inverter components. The internal fan can either be controlled separately as an external fan depending on the temperature, or magnetically coupled to the shaft 8, so that a kind of self-ventilation occurs as soon as the shaft 8 rotates.

[0071] FIG 4 shows in a longitudinal section the pot-shaped hybrid bearing shield 7, in which the side wall 19 is made of a thermally comparatively good conductive material by means of an aluminum extrusion process and the pot bottom is made by an aluminum die casting process.

[0072] This B-side bearing shield 7 is therefore designed as a hybrid bearing shield, the parts of which, such as side wall 19 and pot base 22, are optimally adapted to the respective material requirements.

[0073] The hybrid bearing shield 7 thus features an extruded aluminum side wall 19 with cooling fins 11 on the outer surface 21 for cooling and geometries on the inner surface 20 for mounting and thermally connecting the power electronics 13. The cup base 22 of the B-side bearing shield 7, and in particular its hub area, is made of die-cast aluminum and is suitable for mounting further electronic components of the inverter and the bearing hub for the bearing receptacle 24 of the B-side bearing. By designing the B-side bearing shield as a hybrid bearing shield 7, the best properties of the materials can be utilized in the appropriate locations (side wall 19, cup base 22).

[0074] The power electronics 13 are thus integrated into the bearing shield 7, in particular the side wall 19, so that the components with the greatest losses are cooled most effectively. The IGBTs 16, in particular, are thermally connected to the thermally conductive side wall 19. The outer surface 21 of the side wall 19, equipped with cooling fins 11, ensures good cooling of the power electronics 13, especially with air cooling. The side walls 19, made of extruded aluminum, have a thermal conductivity of 200-220 W / mK, which is 100 W / mK higher than that of the cast aluminum in the hub area. According to the invention, die-cast aluminum is used in the base 22, in particular in the hub area of ​​the B-side bearing shield 7. This material has the required strength and allows for various geometries required for the bearing housing 24 and the control components of the inverter.

[0075] Both parts of the B-side bearing shield 7, namely side wall 19 and pot base 22, are joined together beforehand. This can be done by welding, gluing, shrinking, or direct casting. Detachable connections, such as screws, are also conceivable.

[0076] The machining of the entire B-side bearing shield 7 can then be carried out in a single setup, since the two bearing shield components, side wall 19 and cup base 22, are already joined together in their raw state. This allows for improved quality and lower manufacturing costs. Cooling fins can be formed by the extrusion process of the side wall 19.

[0077] The outer surface 21 of the side wall 19 is designed to be very delicate. This increases the thermally active surface area and thus contributes to improved cooling of the thermally connected power electronics 13.

[0078] Reference character list

[0079] 1 dynamoelectric machine

[0080] 2 cases

[0081] 3 terminal boxes

[0082] 4 Stator

[0083] 5 winding system

[0084] 6 Rotor

[0085] 7 B-side storage plate

[0086] 8 wave

[0087] 9 wave passage

[0088] 10 BS bearings

[0089] 11 cooling fins

[0090] 12-axis

[0091] 13 Power Electronics

[0092] 14 Control electronics

[0093] 15 Contacting, power electronics for the winding system

[0094] 16 IGBT

[0095] 17 Contacting terminal box inverter

[0096] 19 Side wall, storage sign

[0097] 20 Inside of the side wall

[0098] 21 Outside of the side wall

[0099] 22 Pot base storage label

[0100] 23 air gap

[0101] 24 Bearing intake

[0102] 25 flat surface

[0103] 30 drive

[0104] 31 AS storage

[0105] 32 Fastening element

[0106] 33 cooling fins housing

Claims

Patent claims 1. Drive (30) with - at least a dynamoelectric rotary machine (1) arranged in a housing (2) with a winding system (5) arranged in a stator (4) and a rotor (6) separated from it by an air gap (23), which is rotatably mounted about an axis (12) via at least one bearing (10) of a B-side pot-shaped bearing shield (7), - at least one converter, wherein the converter has at least some of the following components, such as power semiconductors, chokes, capacitors, control and regulation units and communication units in a housing volume, which are at least partially surrounded radially by the B-side bearing shield (7) and wherein at least some components of the converter are thermally connected to the bearing shield (7), in particular by arranging heat-intensive components (13) of the converter on an inner side (20) of the side wall (19) of the pot-shaped bearing shield (7), - wherein the converter, viewed axially, is arranged between the dynamoelectric rotary machine (1) and the bearing of the B-side pot-like bearing shield (7), characterized by , - that the side wall (19) and the bottom of the pot (22) of the B-side bearing shield (7) have different materials and / or thermal conductivities and, - that the side walls (19) of the B-side bearing plate (7) are manufactured using an aluminum extrusion process and the pot base (22) of the B-side bearing plate (7) is manufactured using an aluminum die-casting process.

3. Drive (30) according to one of the preceding claims, characterized in that the power- The converter semiconductors, such as IGBTs, are in direct thermal contact with the side wall (19) of the pot-shaped bearing shield (7) by arranging the IGBTs in axially extending, tangentially aligned pockets (18) on the inside (20) of the side wall (19) of the pot-shaped bearing shield (7) and / or by having a thermally conductive potting compound between the IGBTs and the inside (20) of the pot-shaped bearing shield (7).

4. Drive (30) according to one of the preceding claims, characterized in that the bearing shield (7) has cooling fins (11) at least on its outer side (21) in sections.

5. Drive (30) according to one of the preceding claims, characterized in that the cooling fins (11) of the side wall (19) , manufactured by an aluminum extrusion process, are very delicate, with a fin thickness of approximately 1 mm.

6. Drive (30) according to one of the preceding claims, characterized in that the housing (2) of the dynamoelectric rotary machine (1) has at least partially axially extending cooling fins (33).

7. Drive (30) according to claim 6, characterized in that the cooling fins (11) on the side wall (19) of the bearing shield (7) and the cooling fins (33) of the housing (2) are axially aligned.

8. Drive (30) according to one of the preceding claims, characterized in that the pot base (22) of the B-side bearing plate (7) is connected to the side wall (19) of the B-side bearing plate (7) by welding, gluing, Screwing, shrinking, or direct casting are involved.

9. Drive (30) according to one of the preceding claims, characterized in that the drive (30) is used, inter alia, as a compact drive in compressors, fans, compressors, pumps in industrial environments and in mobility applications.

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