Motor-integrated inverter comprising a shielding element

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) that is separated from the winding system by an air gap (23) and is rotatably mounted about an axis (12) via at least one bearing (10) of a B-side cup-shaped bearing shield (7), the stator (4) and the rotor (6) being located in a motor interior space (18); - at least one inverter, the inverter comprising at least some of the following components: power semiconductors, inductors, capacitors, open-loop and closed-loop control units, and communication units, and being located in an inverter installation space (13) which is radially surrounded, at least in sections, by the B-side bearing shield (7), at least some components of the inverter being thermally conductively connected to the bearing shield (7), in particular in that heat-generating components of the inverter are arranged on an inner side wall (20) of the cup-shaped bearing shield (7), - wherein, when viewed in the axial direction, the inverter is arranged between the dynamo-electric rotary machine (1) and the bearing of the B-side cup-shaped bearing shield (7), - wherein the motor interior space (18) and the inverter installation space (13) are separated by a shielding element (16).

Description

[0001] 202412672

[0002] 1

[0003] Description

[0004] Motor-integrated inverter with shielding element

[0005] The invention relates to a drive with a dynamo-electric machine and an inverter, which are arranged axially one behind the other in an interior space of the drive.

[0006] For variable-speed dynamoelectric machines, such as electric motors, especially synchronous, asynchronous, and reluctance motors, frequency converters are needed to adjust the desired speed.

[0007] Frequency converters 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 converter to the housing, for example, as an add-on with its own ventilation or with integrated ventilation provided by the motor fan.

[0008] In decentralized inverter designs, the connection between the inverter and the motor is made via a cable leading to the terminal block. In inverter designs mounted on the motor, the connecting cables are routed to the inverter through openings in the housing.

[0009] This manual effort, required to route the stator leads and additional leads from the winding through the housing opening, results in disproportionately high assembly costs, especially for smaller sizes. Furthermore, the drive system loses compactness due to the sequential arrangement of the individual components (motor + inverter), thus compromising the interchangeability of drive systems.

[0010] A drive unit is known, for example, from DE 198 12 729 A1. This document describes an electric motor, in particular with a fan wheel for generating an axial or radial airflow. This drive unit comprises a control housing with a control unit, wherein the drive unit includes a stator, a rotor, and at least one electrical coil, and wherein the control unit includes 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. 202412672

[0011] 2

[0012] From EP 0 854 560 A1, an electrical drive system with motor and inverter with forced ventilation is known, which are arranged axially one behind the other.

[0013] From EP 3 363 105 B1 a B-bearing shield for an electric motor is known, wherein a circuit board is integrated into the B-bearing shield, wherein a converter is formed on the circuit board.

[0014] These designs of the inverter, mounted directly on the motor, require a lot of installation space because the bearing is located between the motor and the inverter. This makes the drive comparatively large and heavy.

[0015] From DE 10 2004 031 399 A1, a converter motor with a self-ventilated electric motor and a frequency converter is known, wherein components of the frequency converter are arranged at the bottom of the cup-shaped bearing shield.

[0016] This drive also requires a comparatively large amount of installation space.

[0017] Based on this, the invention aims to create a compact, simply constructed drive for diverse applications.

[0018] The problem is solved by a drive system that meets the characteristics of the independent claims.

[0019] Advantageous configurations can be found in the dependent claims.

[0020] According to the invention, the drive is equipped with at least one dynamo-electric rotary machine, a synchronous machine, an asynchronous machine, or a reluctance machine, which is arranged at least predominantly in a housing. A stator, shrunk or pressed into the housing, has a winding system in its substantially axially extending slots, which, when energized, generates a torque on a shaft non-rotatably connected to the rotor due to electromagnetic interactions with a rotor separated by an air gap.

[0021] This integration of the stator into the housing creates a comparatively good heat transfer from the stator's laminated core to the housing and optional housing fins. The rotor is rotatably mounted about its axis via at least one bearing of a B-side, cup-shaped bearing shield. 202412672

[0022] 3

[0023] In a dynamo-electric machine, such as a motor, there is an A-side (output side; drive end; DE side), one end of which points to shaft attachments, such as output elements and / or a driven machine, and is mechanically coupled to this driven machine. The B-side of the motor is located at the other end of the shaft (non-drive end; NDE side).

[0024] Furthermore, the drive includes at least one inverter, which, depending on the design (intermediate link inverter, direct inverter, etc.), comprises at least some of the following components, such as power semiconductors, inductors, capacitors, control units, and communication units. The inverter occupies a dedicated inverter housing and is radially surrounded, at least partially, by the B-side end shield. At least some inverter components are thermally connected to the end shield, particularly by arranging heat-intensive components on an inner side wall of the cup-shaped end shield. Axially, the inverter is positioned between the rotary dynamo-electric machine and the bearing of the B-side cup-shaped end shield.

[0025] The inverter's power semiconductors, such as IGBTs, which are particularly heat-intensive and therefore generate significant power losses, are in direct thermal contact with the end shield, especially with the side wall of the cup-shaped B-side end shield. This creates a direct thermal coupling to the side walls of the cup-shaped end shield, thus facilitating heat dissipation from the inverter, particularly via the side walls. This results in a compact drive design.

[0026] The interior of the drive consists of the motor interior and the inverter installation space, which are axially limited by the A- and B-side bearings and separated by a shielding element arranged between the motor interior and the inverter installation space.

[0027] The converter or its components are integrated directly behind the stator with winding, i.e. the winding head in the housing and / or in the bearing shield, when viewed in the axial direction.

[0028] The inverter components can also be distributed across adjacent sections of the housing and end shield. 202412672

[0029] 4

[0030] The electronics of the inverter and the winding head of the stator are only approximately 10-50 mm apart axially. The shielding element thus prevents or reduces mutual electromagnetic interference.

[0031] This shielding element is advantageously designed in a ring-shaped cross-sectional form – that is, viewed perpendicular to the axis. It is installed between the winding head of the stator and the converter housing.

[0032] Furthermore, the shielding element also serves as thermal shielding. In particular, the winding head of the stator winding system can reach temperatures exceeding 180°C for short periods. The axially opposite converter elements, with their associated electronics, must be protected from these temperatures.

[0033] This thermal shielding is performed as a second function of the conductive shielding element. Due to its electrical conductivity (10 12 - 10 6 The shielding element (S / m) serves as EMC shielding and also as heat dissipation to the housing, since the plastic of the shielding element can advantageously be equipped with increased thermal conductivity (>0.2 W / mK). The inverter installation space is thus protected from thermal and electrical influences.

[0034] The conductive shielding element thus serves a dual function between the motor interior and the inverter installation space. Firstly, it protects the inverter installation space from the heat generated by the motor interior, particularly from the stator winding head; secondly, it provides electromagnetic shielding between the motor interior and the inverter installation space.

[0035] In addition, the shielding element can act as a thermal connection to the housing and ensure heat dissipation from the winding head.

[0036] If potting of the winding head is planned, this shielding element can also be used as a potting mold that remains in the drive unit, provided it is appropriately shaped. A separate potting tool that needs to be demolded is therefore unnecessary.

[0037] Comparatively good heat dissipation is achieved primarily by arranging the inverter's power semiconductors, such as the IGBTs, in axially extending, tangentially aligned pockets on the inner side wall of the cup-shaped bearing shield, and by thermally coupling them, for example, via clamping or spring elements. 202412672

[0038] 5

[0039] Additionally or instead, the power semiconductors of the converter can also establish an improved thermally conductive contact between the components of the converter and the bearing shield by means of a thermally conductive potting compound.

[0040] The bearing shield and / or housing can be manufactured using a die-casting process. The bearing shield and / or housing is made of a material with relatively good thermal conductivity, such as aluminum or an aluminum alloy.

[0041] The die-casting process allows for the incorporation of various geometries into the bearing shield, such as pockets, enabling the IGBTs to be mounted without additional screws. This can be achieved by clipping, clamping, or sliding the IGBTs into a conical groove within the pocket or similar mechanism. Optionally, the IGBTs can be further secured and their heat dissipation improved by being encapsulated / bonded with a special thermally conductive resin.

[0042] 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.

[0043] Axially and / or radially aligned cooling fins on the bearing shield and / or housing of the dynamoelectric rotary machine increase the cooling efficiency of the drive.

[0044] These cooling fins on the outer diameter ensure excellent cooling of the electronic components. The cooling fins are ideally positioned in the motor's cooling airflow, thus ensuring highly efficient dissipation of heat loss.

[0045] The axially oriented 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 half the distance between two housing fins increases turbulence, resulting in, among other things, a turbulent flow that improves cooling.

[0046] This means that all the power electronics in the inverter housing are mounted directly on the bearing shield, the side walls, and / or the bottom of the housing. Through the integration of the 202412672

[0047] 6

[0048] By integrating the power electronics into the bearing shield and thus into the inverter installation space, many functions (bearing support, fixing of the power and control electronics, etc.) are combined according to the invention, and the free space in the interior of the drive is ideally utilized.

[0049] In addition, mounting threads can also be incorporated into the bearing plate to attach further modular attachments, such as sensor devices and / or communication devices.

[0050] The bearing on the NDE side, in particular a ball bearing, is mounted axially from the outside and removed when replacing the bearing. This also allows for excellent replaceability in case of a fault, without having to disconnect the motor from the driven machine on the A side and remove the inverter.

[0051] The inverter, or inverter housing, has a central passage for the shaft. The inverter's power electronics only require a small internal passage for the motor shaft (motor shaft diameter + 1 mm = shaft passage in the inverter housing), rather than the usual large passage for the bearing. This creates additional installation space for the inverter components, such as the power electronics, and makes the drive system, with its motor-inverter, even more compact, especially axially.

[0052] As the following calculation example shows, an additional installation volume results from an axial length of the converter.

[0053] Axle height (AH) specification for AH90; 0 motor shaft is 28.5mm;

[0054] — > Passage in the inverter installation space when mounting the bearing from the outside: 28.5 mm + 1 mm = 29.5 mm

[0055] — > Passage in the inverter installation space with the previous standard bearing mounting from the inside (i.e., bearing is located between motor and inverter): Ball bearing 6304 Outer diameter: 0.52mm + 1mm = 0.53mm

[0056] With an axial length of 65mm for the inverter, this results in an additional installation volume of 98974mm. 3 .

[0057] The bearing shield thus features, according to the invention, a functional integration of, among other things, power electronics within the motor interior. The inverter components do not require a separate housing because all mounting points are integrated into the B-side bearing shield. Therefore, 202412672

[0058] 7. The installation space of the drive is optimally utilized, resulting in a drive with a compact motor-inverter system. There is no hindrance to a modular concept on the NDE side of the motor; that is, all conceivable attachments to the NDE shaft end, such as a brake, external fan, or encoder, remain possible.

[0059] The B-side end shield can be pre-assembled with all the inverter components and, if necessary, potted. This creates a ready-to-install inverter system. This inverter system connects to the mains voltage via its input inverter and a terminal block in a terminal box, while the output side of the inverter system is connected to the motor's winding system. These connections are preferably made when the end shield is mounted to the housing.

[0060] The B-side bearing shield is essentially cup-shaped. The base of the cup has a recess through which the shaft protrudes, which, among other things, forms the drive shaft of the cooling unit, in particular a fan. The aforementioned attachments 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 cup-shaped bearing shield is preferably polygonal in order to easily position the power semiconductors as directly as possible on the inner surface of the bearing shield and thus at the heat sink. This ensures a comparatively good thermal connection of these components to the side wall of the bearing shield.

[0061] Depending on the design, the converter system thus comprises power semiconductors, inductors, 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-side end shield with a comparatively low thermal resistance.

[0062] The components of the converter system, especially the power semiconductors, but also the control electronics, are cooled via thermal coupling to the extensive side walls and / or the front face of the bearing shield, i.e. the "pot bottom".

[0063] The stator and rotor generate heat, which, among other things, heats the interior of the rotary dynamo-electric machine. In particular, the winding head of the stator winding system can reach temperatures exceeding 180°C for short periods. 202412672

[0064] 8

[0065] The shielding element serves as thermal shielding, in particular to protect the converter elements axially opposite the winding head with the corresponding electronics from these temperatures.

[0066] This heat input from the dynamo-electric machine is also dissipated by the air flowing around the housing and the bearing shields. Furthermore, the stator is preferably shrink-wrapped into a casing to ensure comparatively good heat transfer from the stator's laminated core to the housing and the housing fins.

[0067] A cooling unit, designed specifically as an integrated fan, generates a cooling airflow during operation of the rotary dynamo machine. This airflow is initially directed radially along the bottom of the bearing shell and then along the outer side wall of the bearing shell. A fan shroud, extending axially towards the AS bearing, also directs the cooling airflow along the cooling fins of the bearing shell and housing of the rotary dynamo machine.

[0068] The invention and further advantageous embodiments of the invention are described in more detail with reference to exemplary embodiments shown in principle; therein:

[0069] FIG 1 shows a basic longitudinal section of a drive according to the invention with a shielding element,

[0070] FIG 2 shows a principal longitudinal section of a drive according to the invention with a shaped shielding element.

[0071] It should be noted that terms such as "axial," "radial," "tangential," etc., refer to the axis 12 used in the respective figure or described example. 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."

[0072] With regard to a surface, e.g., a cross-sectional area, the terms "axial," "radial," "tangential," etc., describe the orientation of the surface's normal vector, i.e., the vector that is perpendicular to the surface in question. 202412672

[0073] 9

[0074] 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.

[0075] 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."

[0076] 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.

[0077] 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.

[0078] FIG 1 shows a 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 and forms winding heads at the end faces of the stator core 4. A rotor core 6 is non-rotatably connected 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, 31: an AS bearing 31 and a BS bearing 10. 202412672

[0079] 10

[0080] The rotor 6 can be designed as an asynchronous rotor, a permanent magnet rotor or a reluctance rotor.

[0081] The dynamoelectric rotary machine 1 is enclosed in a housing 2, which is bounded at its end faces by bearing shields. The BS bearing 10 is held by its B-side cup-shaped bearing shield 7. The housing 2 and the B-side cup-shaped bearing shield 7 have cooling fins 11 extending substantially axially along their outer circumference.

[0082] The B-side end shield 7 is connected to the housing 2 via its side walls 19. The structural interface between the housing 2 and the B-side end shield 7 does not have to coincide with the spatial separation between the motor interior 18 and the inverter installation space 13, as shown in FIG. 1. Advantageously, however, the shielding element 16 can be connected to the housing 2 and / or the end shield 7 at this interface. The end shield 7 is screwed to the housing 2, with at least some of the radially outer areas of the shielding element 16 being located between the end shield 7 and the housing 2.

[0083] A converter supplying the dynamoelectric rotary machine 1, comprising components such as power semiconductors, inductors, capacitors, control and regulation units, and communication units, is housed in the converter compartment 13. The relevant components 14, 15 of the converter are preferably connected to a terminal box 3 or to the winding system 5 via plug connectors.

[0084] The converter is stationary and the converter installation space 13 has a shaft passage 9 which has a distance of only about 1mm between its radially internal components and the shaft 8.

[0085] For this reason, the BS bearing 10 is arranged on the bottom of the cup 22 of the bearing shield 7. This makes bearing replacement easier, while simultaneously maximizing the space available for the inverter 13.

[0086] Within the converter installation space 13, the converter components that require more intensive cooling, such as the power electronics, are located on the inner side walls 20 of the bearing shield 7 and, in this design, are also thermally coupled to the axially adjacent housing section.

[0087] The bearing receptacle 24 of the bearing 10 is tubular in this design, which facilitates disassembly of the bearing 10. 202412672

[0088] 11

[0089] The converter installation space 13 is limited to the interior of the bearing shield 7 or projects axially beyond the side walls 19 (FIG 1, 2). The converter occupying the converter installation space 13 thus forms a pre-assembled unit that only needs to be electrically connected to the winding system 5 and the terminal box 3.

[0090] The cup base 22 of the B-side bearing shield 7 has a tubular bearing receptacle 24 for the bearing 10, as shown in FIGS. 1, 2. The cup base 22 of the B-side bearing shield 7 can also be completely smooth, i.e., in a plane perpendicular to the axis 12.

[0091] On both the A-side and the B-side, the shaft 8 protrudes from the drive 30. The driven machine, such as a compressor or pump, is connected on the A-side. Modular attachments, such as a brake unit, external fan module, or a sensor, particularly a rotary encoder, can be mounted on the B-side.

[0092] The tubular bearing housing and the bearing shield 7 are advantageously formed in one piece. The cooling fins on the outer side walls 21 are arranged parallel in sections.

[0093] In these embodiments, the inverter mounting space 13 projects axially beyond the bearing shield 7, with this section of the inverter, projecting axially beyond the side walls 19, being located in the housing 2 of the machine 1 when assembled. The shielding element 16 is then to be installed there, for example, in an inner circumferential recess of the housing 2.

[0094] The bearing shield 7 can be attached to the housing 2, possibly together with the shielding element 16, using fastening elements.

[0095] The converter installation space 13, as well as the shielding element 16, has the lowest possible wave passage 9.

[0096] The inner side walls 20 of the bearing shield 7 have axially extending, tangentially aligned pockets in which the power semiconductors of the converter are arranged and which are thermally coupled to the side walls 19 of the bearing shield 7. 202412672

[0097] 12

[0098] Planar surfaces are provided extensively on the inner side wall 20 of the bearing shield 7 for positioning the power semiconductors. The number of these planar surfaces depends on the number of heat-intensive heat sources.

[0099] An internal or external fan can be mounted axially to the B-side, generating a cooling airflow that is guided through an optional fan shroud. The airflow is supplied to the fan via an intake opening in the shroud.

[0100] The heat to be dissipated from machine 1 consists, among other things, of the waste heat from stator 4 and rotor 6.

[0101] The end shield 7 is made of a thermally conductive material, allowing the heat loss from the inverter components, particularly the power semiconductors, to be dissipated from the inverter mounting space 13 to the outer side wall 21 and / or a cooling airflow via the flat surfaces. Additional cooling fins 11 on the housing 2 and / or on the outer side wall 21 of the end shield 7 increase the heat dissipation effect, especially if a fan shroud directs the cooling airflow.

[0102] To increase the surface area of ​​the bearing shield 7, the pot base has radially extending or parallel ribs on its outer side.

[0103] Advantageously, the ribs 11 of the bearing shield 7 and the ribs of the housing 2 of the dynamoelectric rotary machine 1 are in axial alignment in order to offer as little flow resistance as possible to the cooling airflow.

[0104] The drive 30 and its respective sections / parts / components are cooled by one or more cooling units, which can also be implemented as liquid cooling (cooling jacket on the housing 2 of the dynamoelectric rotary machine 1 and / or on the bearing shield 7).

[0105] It is also possible to provide one or more internal fans in the inverter assembly space 13 and / or motor interior 18, which rotate within the inverter assembly space 13 and / or motor interior 18 and create air turbulence, thus providing additional cooling to the components of the inverter and / or stator 4 and rotor 6. The internal fans can either be separately 202412672

[0106] The internal fans 13 can be controlled as external fans depending on the temperature. The internal fans can also be mechanically or magnetically coupled to the shaft 8, so that a kind of self-ventilation of the inverter housing 13 and / or motor housing 18 occurs as soon as the shaft 8 rotates. Such drives 30 are used in compressors, fans, compressors, and pumps in industrial environments, but also in mobility applications such as trains or e-trucks, where a comparatively high degree of compactness of high-performance drives 30 is particularly important.

[0107] 202412672

[0108] Reference symbol list

[0109] 1 dynamic electric machine

[0110] 2 cases

[0111] 3 terminal boxes

[0112] 4 Stator

[0113] 5 winding system

[0114] 6 Rotor

[0115] 7 B-side storage plate

[0116] 8 wave

[0117] 9 wave passage

[0118] 10 warehouses

[0119] 11 ribs

[0120] 12-axis

[0121] 13 Converter installation space

[0122] 14 Contacting, terminal box

[0123] 15 Contacting, power electronics for the winding system

[0124] 16 Shielding element

[0125] 17 Casting

[0126] 18 Engine compartment

[0127] 19 Side wall, storage sign

[0128] 20 side wall, storage plate inside

[0129] 21 Side wall, bearing plate outside

[0130] 22 Pot base storage label

[0131] 23 air gap

[0132] 24 Bearing intake

[0133] 30 drive

[0134] 31 AS storage

Claims

202412672 15 Patent claims 1. Drive (30) with - at least one 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), wherein the stator (4) and rotor (6) are located in a motor interior (18) - at least one converter, wherein the converter comprises at least some of the following components, such as power semiconductors, chokes, capacitors, control and regulation units and communication units, and is located in a converter installation space (13) which is radially surrounded at least partially by the B-side bearing shield (7), wherein at least some components of the converter are thermally connected to the bearing shield (7), in particular by arranging heat-intensive components of the converter on an inner side wall (20) of the pot-shaped bearing shield (7), - wherein the converter is arranged axially between the dynamoelectric rotary machine (1) and the bearing of the B-side pot-shaped bearing shield (7), - wherein the motor interior (18) and the inverter installation space (13) are separated by a shielding element (16).

2. Drive (30) according to claim 1, characterized in that the shielding element (16) functions as thermal protection and / or as EMC shielding.

3. Drive (30) according to claim 1 or 2, characterized in that the shielding element (16) is designed in an annular shape, with a shaft passage (9) being carried out substantially in the middle.

4. Drive (30) according to one of the preceding claims, characterized in that the shielding element (16) made of conductive plastic is electrically and / or thermally connected at least section by section to the housing (2) and / or bearing shield (7).

5. Drive (30) according to claim 4, characterized in that the shielding element (16) is designed as a plastic containing metal particles.

6. Drive (30) according to one of the preceding claims, characterized by 202412672 Figure 16 shows that the shielding element (16) takes over the shaping of the winding head (5) at least in sections and is provided there with a winding head potting (17).

7. Drive (30) according to one of the preceding claims, characterized in that the power semiconductors of the converter, such as IGBTs, are in thermally direct conductive contact with the bearing shield (7), in particular with the side wall (20) of the pot-shaped bearing shield (7).

8. Drive (30) according to claim 7, characterized in that the power semiconductors of the converter, such as IGBTs, are arranged in axially extending, tangentially aligned pockets (18) on the inner side wall (20) of the pot-like bearing shield (7).

9. Drive (30) according to one of the preceding claims, characterized in that the thermally conductive contact between the components of the converter and the bearing shield (7) is effected by a contact pressure and / or a thermally conductive potting compound (17).

10. 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 walls (21) in sections.

11. Drive (30) according to one of the preceding claims, characterized in that the dynamoelectric rotary machine (1) is enclosed in a housing (2) which has cooling fins extending axially at least in sections.

12. Drive (30) according to the preceding claims 10 and 11, characterized in that the cooling fins (11) of the bearing shield (7) and the cooling fins of the housing (2) are axially aligned.

13. Drive (30) according to one of the preceding claims, characterized in that a cooling unit can be attached axially outside the bearing shield (7) as a fan unit, which is designed as an intrinsic fan and / or external fan and generates a cooling airflow at least section by section over the bearing shield (7) and the dynamoelectric rotary machine (1). 202412672 17 14. Drive (30) according to one of the preceding claims, which is used, inter alia, in compressors, fans, compressors, pumps in industrial environments and in mobility applications.

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