阅读说明：本技术 电机 (Electric machine ) 是由 F.布鲁丁 于 2020-02-26 设计创作，主要内容包括：本发明涉及一种具有定子的电机,其中,该定子包括用于容纳定子绕组的多个槽。定子绕组的各个导体区段分别插入到每个槽中。至少一个极对的导体区段在定子的第一侧上彼此短路。在定子的与第一侧对置的第二侧上,导体区段分别与供电单元的接头连接。供电单元包括至少两个导体(17、18),所述至少两个导体(17、18)与至少一个电力电子构件(1)电气连接。至少一个电力电子构件(1)布置在基本上盘状的冷却体(10)上,该冷却体大面积地覆盖定子的第二侧。(The invention relates to an electric machine having a stator, wherein the stator comprises a plurality of slots for accommodating stator windings. The individual conductor sections of the stator winding are inserted into each slot. The conductor sections of at least one pole pair are short-circuited to each other on the first side of the stator. On a second side of the stator, which is opposite the first side, the conductor sections are each connected to a connection of the power supply unit. The power supply unit comprises at least two conductors (17, 18), the at least two conductors (17, 18) being electrically connected with at least one power electronic component (1). At least one power electronic component (1) is arranged on a substantially disk-shaped cooling body (10) which covers the second side of the stator over a large area.)

1. An electric machine having a stator, wherein,

-the stator comprises a plurality of slots for accommodating stator windings;

-inserting a respective conductor section of the stator winding into each slot;

-the conductor sections of at least one pole pair are short-circuited to each other on a first side of the stator;

on a second side of the stator opposite the first side, the conductor sections are each connected to a connection of a power supply unit;

-the power supply unit comprises at least two conductors (17, 18) electrically connected with at least one power electronic component (1);

-the at least one power electronic component (1) is arranged on a cooling body (10);

it is characterized in that the preparation method is characterized in that,

the cooling body (10) is substantially disk-shaped and covers the second side of the stator over a large area.

2. An electric machine according to claim 1, characterized in that the cooling body (10) comprises at least one fluid channel (14) for guiding a fluid.

3. The electrical machine according to claim 1 or 2, characterized in that the at least two conductors (17, 18) are designed at least in sections annularly.

4. An electric machine according to any one of claims 1-3, characterized in that at least one of the at least two conductors (17, 18) is arranged on the cooling body (10).

5. The electrical machine according to any of claims 1 to 4, characterized in that at least one of the at least two conductors (17, 18) is arranged on the first side (11) of the cooling body (10) together with the at least one power electronic component (1).

6. The electrical machine according to any one of claims 1 to 4, characterized in that at least one of the at least two conductors (17, 18) is arranged on a second side (12) of the cooling body (10) opposite to the first side (11).

7. An electric machine according to any one of the preceding claims, characterized in that the cooling body (10) forms one of the at least two conductors (17, 18).

8. The machine according to any of the preceding claims, characterized in that the power electronic component (1) comprises a single-or multi-layer printed circuit board (6) with at least one semiconductor switch (2, 3) and optionally a driver circuit (4).

9. An electric machine according to claim 8, characterized in that at least one of the at least two conductors (17, 18) is arranged on the printed circuit board (6).

10. The electrical machine according to claim 8 or 9, characterized in that the at least one semiconductor switch (2, 3) and the optional drive circuit (5) are arranged on the printed circuit board (6) and/or in the printed circuit board (6).

11. The electrical machine according to any one of claims 8 to 10, characterized in that the at least one semiconductor switch (2, 3) and/or the drive circuit (5) are designed as surface-mountable components.

12. The machine according to any of claims 8 to 11, characterized in that the printed circuit board (6) forms at least a part of the cooling body (10).

13. The machine according to claim 12, characterized in that the printed circuit board (6) is provided with at least one cooling groove (16) which is open on one side, wherein the printed circuit board (6) is connected to a counterplate (24) on the side with the at least one cooling groove (16) which is open on one side.

14. The electrical machine according to any one of claims 8 to 13, characterized in that the conductor section (20) is extended by an associated recess (15) in the cooling body (10) and the printed circuit board (6) in order to be electrically connected to the at least one power electronic component (1) on the side of the cooling body (10) facing away from the stator.

15. The electrical machine according to one of claims 1 to 13, characterized in that the conductor section (20) is connected to the at least one power electronic component (1) via a respective connection via an in particular central inner bore (13) of the cooling body (10) and/or outside the outer circumference of the cooling body (10).

16. The electrical machine according to one of claims 1 to 14, characterized in that the cooling body (10) has a plurality of segments, wherein the number of segments corresponds in particular to the number of phases.

17. The machine according to any of the claims 1 to 16, characterized in that the respective power electronic component (1) is designed for controlling one or more phases.

Technical Field

The present invention relates to an electric machine having a stator.

Background

The stator has electrical windings connected to a current system, which is typically multi-phase. For applications with more than two coils per pole per phase, distributed windings are mainly used. The main advantage of distributed windings is that the magnetomotive force in the air gap between the stator of the electrical machine and the rotor movably supported with respect to the stator has fewer harmonic components, i.e. the components of the unwanted harmonics in the magnetomotive force are lower. This results in a high efficiency of the machine which can be operated in motor mode or generator mode, with low rotor losses, low noise and few vibration problems. However, a disadvantage of distributed windings is the high manufacturing costs.

In order to combine the advantages of a motor with good electrical properties of distributed windings and low manufacturing costs, DE 102014113489 a1 suggests that the stator comprises a plurality of slots formed between adjacent teeth of the stator and intended to receive the stator windings, in which motor with the stator conductor sections of the stator windings are inserted in each slot. The conductor sections of at least one pole pair are short-circuited to one another on the first side of the stator. On a second side of the stator, opposite the first side, the free ends of the conductor sections are connected to the terminals of the power supply unit. The power supply unit comprises two electrical conductors. In order to be able to dissipate the heat losses of the semiconductor switch and of the other components of the power electronics component, an active cooling device is provided in that an annular cooling channel is provided for conducting a fluid, on which the power electronics component is arranged. In this case, it is provided that the cooling channel is arranged in or between two annularly arranged conductors. Thereby resulting in high manufacturing costs.

Disclosure of Invention

The object of the invention is therefore to improve an electrical machine with distributed winding with good electrical properties and with good cooling, which has the advantage of low production costs.

This object is achieved by an electric machine according to the features of claim 1. Advantageous embodiments and further developments are specified in the dependent claims.

In one embodiment, an electric machine having a stator is provided. The stator includes a plurality of slots formed between adjacent teeth of the stator. The slots are for receiving stator windings. The conductor sections of the stator winding are inserted into each slot. The conductor sections of at least one pole pair are short-circuited to each other on the first side of the stator. On a second side of the stator, opposite the first side, the free ends of the conductor sections are connected to the terminals of the power supply unit. The power supply unit includes at least two conductors electrically connected with at least one power electronic component. The power electronic component is assigned to one or more conductor sections. At least one power electronic component is arranged on the heat sink, wherein the heat sink is essentially disk-shaped and covers the second side of the stator over a large area.

According to the proposed principle, a large-area cooling body can be provided which covers the second side of the stator, i.e. is arranged on the end face of the stator, and which serves as a carrier for the power electronics components. In this way, a simplified and effective cooling of the at least one power electronics component is ensured, wherein the electric machine can be produced with little production cost.

In the proposed electric machine, the stator-side winding mentioned at the beginning is replaced by a single-bar winding (einzelstabwinding), which is simplified as follows: each of the slots thereof has a conductor section and the conductor sections can thus be designed, for example, substantially in a straight line in the axial direction. In this case, a high current intensity at low voltages can be used to achieve a magnetomotive force of the same order of magnitude as in conventional machines with distributed windings.

The integration of the power electronics comprising at least one power electronics component can be achieved in a simple manner by an arrangement on a disk-shaped and therefore flat heat sink, as a result of which a particularly compact construction of the electric machine is achieved in particular.

The substantially disk-shaped design of the cooling body is to be understood as meaning not only circular but also polygonal edge contours. Thus, the edge profile may have several angles, such that the edge profile is a quadrilateral, a pentagon, a hexagon, etc. Typically, the number of corners is greater than or equal to four.

The cooling body is preferably made of a non-magnetic material. The material for the cooling body is preferably electrically non-conductive.

In one embodiment, each power electronic component is in contact with a respective conductor section (designed as a single bar). Thereby, each power electronic component is used to supply power to each conductor section. A plurality of power electronic components may also be provided, which are arranged distributed on the cooling body along the circumference of the stator.

The cooling body may advantageously comprise at least one fluid channel for guiding a fluid. The at least one fluid channel is arranged in the heat sink in such a way that, in particular, the heat generated by the power electronics component can be dissipated efficiently.

It is particularly expedient for the at least two conductors to be of annular design. This makes it possible, in particular if a plurality of power electronic components are provided, to apply corresponding voltage potentials to these power electronic components in a simple manner.

In one expedient configuration, at least one of the at least two conductors is arranged on the heat sink. If the cooling body is made of an insulating material, no separate insulation measures need to be provided.

A new embodiment provides that at least one of the at least two conductors is arranged together with at least one power electronic component on the first side of the heat sink. Alternatively, at least one of the at least two conductors may be arranged on a second side of the cooling body opposite to the first side. An arrangement of at least two conductors on the side of the cooling body facing the stator is thus possible. A further embodiment makes possible a variant in which at least two conductors are arranged on the side of the heat sink facing away from the stator. Likewise, variants are possible in which one of the two conductors is arranged on the side of the cooling body facing the stator and the other of the two conductors is arranged on the side of the cooling body facing away from the stator. Which variant is preferred may depend in particular on the prevailing spatial conditions.

It is furthermore expedient for the cooling body to form one of the at least two conductors. Thereby, a larger area fraction can be provided for the at least one power electronic component on the surface of the cooling body. In this case, of course, the cooling body must be realized in an electrically insulated manner from the component to which it is applied.

The power electronic component comprises a single-layer or multi-layer printed circuit board (in particular in the form of a metal substrate printed circuit board) with at least one semiconductor switch and optionally a driver circuit. Furthermore, the power electronic component may comprise further electronic components, such as at least one capacitor. The driver circuit and further electronic components may also be arranged on one or more further printed circuit boards.

In a further variant, provision can be made for at least one of the at least two conductors to be arranged on the printed circuit board. The printed circuit board can thus be used, for example, as an insulator for the heat sink.

It is furthermore expedient to arrange the at least one semiconductor circuit and the optional driver circuit on and/or in a printed circuit board. In particular in the case of variants in which at least one semiconductor circuit and optionally a driver circuit (and optionally further electronic components) are arranged in a printed circuit board, the outer surface can be used over a large area for contacting at least two conductors. This can realize a small specific current intensity per unit area.

It is also expedient for the at least one semiconductor switch and/or the optional drive circuit to be designed as a surface-mountable component. Thereby allowing to provide power electronic components having compact dimensions. In particular, no separate power electronic module requiring a large space is required.

A further embodiment provides that the printed circuit board forms at least part of the heat sink. For this purpose, the printed circuit board can be provided with at least one cooling groove which is open on one side in order to form at least one fluid channel, wherein the printed circuit board is connected to the counterplate on the side having the at least one cooling groove which is open on one side. The flip board may optionally have a cooling groove open on one side, which is arranged in correspondence with the cooling groove of the printed circuit board. This makes it possible to achieve a compact arrangement of the heat sink, the power electronics and the power distribution device.

A further embodiment provides for the conductor sections to be extended by associated recesses in the heat sink and in the printed circuit board in order to be electrically connected to the at least one power electronics component on the side of the heat sink facing away from the stator. This embodiment makes it possible to achieve a simple electrical connection of the power electronics to the conductor section which is led out linearly in the axial direction on the second side of the rotor.

Alternatively, the conductor section can be connected to the at least one power electronic component via a respective connecting element via an in particular central inner bore of the heat sink and/or outside the outer circumference of the heat sink.

It is also expedient for the heat sink to have a plurality of sections. In particular, it can be provided here that the number of sections corresponds in particular to the number of phases. Thereby, a particularly efficient cooling of the power electronics may be provided.

A further advantageous embodiment provides that the respective power electronics component is designed for controlling one or more phases.

One of the two conductors, in particular the conductor designed in a ring shape, makes it possible to achieve a positive dc voltage supply. The other of the two conductors, in particular the conductor designed in a ring shape, ensures a negative dc voltage supply. This can be understood as a dc bus. If, for example, a third conductor is provided, this third conductor can have an intermediate potential.

The semiconductor switches of the respective power electronic component are connected in particular to form a half bridge. If the power electronic component optionally has a capacitor, this capacitor can be designed as an intermediate circuit capacitor or as a part of a distributed intermediate circuit capacitance. In this case, it can be provided that a plurality of capacitors are connected in series and/or in parallel with a supporting matrix of conductive and non-conductive elements located between them.

The power supply unit can be designed to supply the individual conductor sections with their own electrical phase by means of the respective power electronics component.

The embodiment of the proposed electrical machine is particularly advantageous from the point of view of electromagnetic compatibility, since no alternating current lines with harmonics have to be laid. Furthermore, no separate converter housing is required. No cables are required between the separate power electronics and the actual motor, since it is the power electronics that is placed, and not the winding heads that are present in conventional machines.

The number of phases may be, for example, three, four, five or at least ten.

In order to achieve particularly low production costs, the conductor sections can be constructed straight. The conductor section may be, for example, an aluminum rod, a copper rod or a bronze rod or an alloy thereof.

Drawings

Further details and embodiments are described in more detail below in the various embodiments with reference to the figures.

In the drawings:

fig. 1 shows a plan view of a first exemplary embodiment of a power electronic component which is applied to a cooling plate designed as a heat sink;

fig. 2 shows a cross-sectional view along the line II-II of the arrangement according to fig. 1;

fig. 3 shows a sectional view of a second embodiment, in which a plurality of power electronic components are arranged on a heat sink designed as a cooling plate;

fig. 4 shows a sectional view of a third embodiment, in which a plurality of power electronic components are arranged on a heat sink designed as a cooling plate;

fig. 5 shows a sectional view of a fourth embodiment, in which a plurality of power electronic components are arranged on a heat sink designed as a cooling plate;

fig. 6 shows a sectional view of a fifth embodiment, in which a plurality of power electronic components are arranged on a heat sink designed as a cooling plate;

fig. 7 shows a sectional view through the left-hand part of a fifth embodiment, in which the printed circuit board is part of a heat sink according to a first variant;

fig. 8 shows a sectional view through a left-hand part of a fifth embodiment, in which the printed circuit board is part of a heat sink according to a second variant;

fig. 9 shows an exploded perspective view of the conductor section, the annular conductor and the power electronics module of a sixth embodiment without showing a cooling body;

FIG. 10 shows a cross-sectional view of a portion of the embodiment shown in FIG. 9 through an arrangement of a cooling body, an annular conductor and a power electronics module;

fig. 11 shows an exploded perspective view of a planar arrangement of power electronics modules and annular conductors on a cooling body according to a seventh embodiment;

FIG. 12 shows a cross-sectional view through the arrangement shown in FIG. 11;

fig. 13 shows a perspective view of an eighth embodiment, wherein two conductors are designed to connect conductor sections of two adjacently arranged power electronic modules;

FIG. 14 shows a cross-sectional view of a power electronic component in a multilayer configuration; and

fig. 15 shows a cross-sectional view of the arrangement of the power electronic components shown in fig. 14 in relation to the cooling body and the conductors of the power supply unit.

In the examples described below, like reference numerals refer to like elements, wherein the views are not true to scale.

Detailed Description

The figures, as they are defined in the introduction of the description, illustrate different variants of the arrangement of the power electronics and the cooling body for a motor known in principle. Such an electric machine, the basic principle of which is known, for example, from DE 102014113489 a1, comprises a stator. The stator has slots distributed along its circumference, which slots extend straight in the axial direction of the stator. In each slot a conductor section 20 is introduced (fig. 2, 9, 10 and 12). The conductor sections of at least one pole pair are short-circuited to one another, for example, in a short-circuit ring on a first side.

Each conductor section 20 can be equipped with a power electronic component 1, which, as will be described in more detail below, is arranged on a cooling body, which is essentially disk-shaped and here is designed in an exemplary circular manner, on a second side of the stator opposite the first side. From this second side of the stator there is also connected a power supply unit comprising, for example, two conductors 17, 18, preferably at least in sections annular, which are electrically connected with the plurality of power electronic components 1. Each power electronic component 1 is constructed as a module and comprises at least one half bridge, which will be explained in more detail later.

Fig. 1 shows a plan view of a plate-shaped heat sink 10 covering a large area of the second side of the stator. The term "large area" is to be understood here to mean that the area occupied by the cooling body 10 corresponds approximately to the area of the end face of the stator on the second side, on which end face the conductor sections are led out of the slots (not shown in fig. 1) essentially in a straight line in the axial direction. The conductor bars pass through an end cap, not shown.

The disk-shaped cooling body 10 has, for example, a central recess 13, which is referred to below as an inner bore. A plurality of power electronic modules 1 is applied to a first side 11 of the heat sink facing away from the stator. The number of power electronic components 1 designed in the form of modules can be 1 or more, wherein the number depends on the number of conductor sections and the number of phases to be formed and the topology of the final stage. In the embodiment shown in fig. 1, for example, six power electronic components 1 can be arranged next to one another over the entire circumference of the disk-shaped heat sink 10. For simplicity, only one power electronic component 1 is shown, wherein their structures are substantially identical.

The electronic component 1 comprises a first semiconductor switch 2, a second semiconductor switch 3, an optional drive circuit and an optional electronic component 5, for example a capacitor. The semiconductor switches are in particular power semiconductors, such as IGBTs, MOSFETs, JFETs etc. Depending on the connection, the electronic component 1 may additionally comprise a diode, not shown. The semiconductor switches 2, 3 are connected as a half bridge, for example. The capacitor 5 may be, for example, an intermediate circuit capacitor of a half bridge.

The semiconductor switches 2, 3, the optional driver circuit 4 and the electronic components 5 are arranged on a printed circuit board 6, which consists of a carrier plate and a conductor track structure. For the sake of clarity, the conductor track structure is not shown in fig. 1.

The power electronics component 1 is mechanically connected to the heat sink 10 via its printed circuit board 6. By means of the mechanical fastening by means of the screws 7 in the exemplary embodiment shown here, the conductor sections 20 associated with the power electronic component 1 are simultaneously electrically contacted (see fig. 2). The conductor section 20 is designed as a single rod. Although only a single conductor section 20 is shown in fig. 1 and 2, the power electronic component 1 can be mechanically and electrically connected to a plurality of conductor sections 20 in the configuration described below.

The screw 7 engages through the recess 9 in the printed circuit board 6 and the recess 15 in the heat sink 10 into a sleeve 21, the recess 15 being arranged concentrically in the axial direction, the sleeve 21 being arranged in the recess 15. For mechanical connection with the screw 7, the sleeve 21 may have an internal thread 22. The electrical connection to the conductor section 20 is realized via the sleeve 21, wherein the connection between the sleeve 21 and the conductor section 20 can be realized by welding, pressure, a threaded connection, a flexible conductor or the like.

In a variant that is not shown, the conductor section 20 can also have a threaded bore with an internal thread, so that the additional sleeve 21 can be dispensed with. In a further variant, which is not shown, the conductor section 20 can also project through the recess 9 and the recess 15 and have an external thread at its end. A nut can then be screwed onto this external thread, which nut is responsible for the mechanical connection between the component 1 and the conductor section 20.

In order to keep the pressure exerted by the screw heads on the printed circuit board 6 as low as possible, it may be expedient to provide a washer 8 and/or a contact disc which distributes the force exerted by the screw heads of the screws 7 over a large area on the printed circuit board 6.

As can be seen from the schematic illustration of fig. 2, the cooling body 10 furthermore comprises at least one fluid channel 14 for conducting a cooling fluid, such as (de-) ionized water or the like. Although the fluid channel 14 extends in the radial direction in the illustrated illustration, the fluid channel 14 (or a plurality of fluid channels) may also extend in the axial direction or zigzag. Combinations thereof are also possible. The flanges are not shown as inlet and outlet for cooling fluid.

Fig. 3 shows a second embodiment in a schematic sectional view. The cooling body 10 is shown again, in the shown illustration, on a first side 11 of the cooling body, power electronic components 1 and 1' are applied to both sides of the inner bore 13, respectively. Below the respective power electronic component 1, 1', the heat sink 10 is provided with a respective (e.g. radially extending) fluid channel 14.

On the side of the respective printed circuit board 6, 6' facing away from the heat sink 10, the already mentioned conductors 17 and 18 are applied as an example as annular and concentrically arranged metal surfaces in the vicinity of the inner bore 13. In the radial direction in the peripheral direction, the semiconductor switches 2, 3 and 2', 3', respectively, can be seen. The electrical contact of the conductor section 20 (not shown) is made by means of an L-shaped connection 23, wherein the legs marked 23A, 23A 'make contact with the conductor track structure of the power electronics component 1, 1', for example by means of a screw connection. The legs 23B, 23B ' extending in the axial direction of the rotor (which extend perpendicularly to the surface of the cooling body 10 and the printed circuit boards 6, 6' of the components 1, 1 ') serve for electrical contact with the associated conductor sections 20, which are not shown here. The fastening may be achieved by welding, screwing or pressure.

The ring conductors 17, 18 form a DC bus, wherein, for example, conductor 17 realizes a positive direct voltage and conductor 18 realizes a negative direct voltage supply.

The design example shown in fig. 4 differs from the design example in fig. 3 in that only the conductors 17 are arranged on the printed circuit boards 6, 6'. The heat sink 10 forms a second conductor 18 and enables a negative dc voltage supply. In this embodiment variant, the heat sink 18 is separated from the power electronics component 1, 1' at least in some sections via an electrically insulating material. This can be achieved, for example, by the substrate of the printed circuit board 6, 6' or by a separately realized insulating layer.

The embodiments shown in fig. 3 and 4 have in common that the first side 11 of the heat sink 10 faces the rotor with the component 1, 1' fastened thereto. In contrast, fig. 5 shows a slightly modified design variant in which the rotor faces the second side 12 of the cooling body 10. This means that the assembly of the power electronics, i.e. the power electronics components 1, 1', faces away from the rotor. In order to establish an electrical connection with the conductor section 20, the sections 23B, 23B' point in the direction of the stator and are optionally (as shown in fig. 5) guided past the outer circumference of the cooling body and/or through the inner bore 13. Alternatively, the sections 23B, 23B' can also be guided through slits or solid recesses (not shown). The inner bore 13 may then be omitted. Depending on where the conductors 17, 18 required for the dc voltage supply are arranged. Since these conductors are arranged concentrically around the inner bore and in the vicinity of the inner bore 13 in the exemplary embodiment of fig. 5, the legs 23B, 23B' are guided past the outer periphery. However, this can also be reversed.

Fig. 6 shows a design example in which the conductors 17, 18 are not applied to the carrier of the respective power electronic component 1, 1', but directly to the heat sink 10. For this purpose, the heat sink 10 can either be made of an electrically insulating material or an insulating layer can be provided between the conductors 17, 18 and in the heat sink 10.

In an alternative embodiment, which is not shown, the conductors 17, 18 can be arranged stacked insulated from one another. The conductor stack can be arranged directly on the heat sink 10 or on the printed circuit board 6.

Fig. 7 and 8 show an exemplary embodiment in which the printed circuit board 6 is a component of the heat sink 10. For this purpose, in the exemplary embodiment according to fig. 7, the base plate 6A of the printed circuit board 6 already mentioned has a plurality of cooling channels 16 which are open on one side. Correspondingly, the counterplate 24 screwed to the base plate 6A of the printed circuit board 6 has a corresponding number of cooling channels 26 open on one side. By way of example only, a plurality of circular cooling channels is thereby obtained. The connection of the base plate 6A and the counterplate 25 is illustratively effected by means of a plurality of screws 25. The mechanical connection of the base plate 6A and the counterplate 24 can also be realized in another way, for example by gluing, welding, riveting, form-fit connecting elements, etc.

In addition to the substrate 6A, the printed circuit board 6 comprises an insulating layer 6B and a conductor track structure applied thereto. In this embodiment, the semiconductor switches 2, 3 and the two conductors 17, 18 for the direct voltage supply are then arranged on the conductor track structure 6C. The substrate 6A, the insulator 6B and the conductor track structure 6C together form the already mentioned printed circuit board 6.

In the embodiment shown in fig. 8, only the inversion plate 24 has a cooling slot 26 that is open on one side. These cooling channels are embodied in the embodiment in a rectangular manner. Likewise, only the base plate 6A may also have a cooling groove that is open on one side, while the inversion plate 24 does not include a cooling groove.

Of course, the cross-sectional shape of the cooling channel may be arbitrary. Likewise, in one embodiment, any combination of different cross sections of the cooling channel can be provided. Furthermore, it is possible to provide cooling channels only in partial sections in the base plate 6A, and only in the flipper 24 at further sectional sections.

Fig. 9 shows an exploded perspective view without a heat sink, in which the conductors 17, 18 are arranged below the power electronics component 1. This can best be seen in the associated cross-sectional view in fig. 10. In the manner already described, the semiconductor switches 2, 3, the optional driver circuit 4 and the electronic components 5 (capacitors) are applied to the printed circuit board 6 of the power electronics component. On opposite sides of the printed circuit board two conductors 17, 18 are arranged. The connection between the printed circuit board 6 of the component 1 and the heat sink 10 is effected, purely by way of example, by means of a threaded connection (not shown) provided between the conductors 17, 18.

In order to be able to form the conductors 17, 18 in as large an area as possible, they can have corresponding recesses 17A and 18A in the region of the screw connection (see fig. 9). Furthermore, a threaded connection is realized as described in connection with fig. 2. The contacting of the conductor sections 20 is only exemplary effected via the already described sleeve 21, which sleeve 21 enables a threaded connection. The sleeve 21 is supported on the printed circuit board 6 from below. The connection between the conductor section 20 and the sleeve 21 can be realized by screwing, welding, pressing, soldering or pressure.

Fig. 11 shows a design example in which the assembly of power electronic components is arranged between concentrically arranged ring-shaped conductors 17, 18, wherein the conductors 17, 18 are arranged on a conductor track structure 6C of the printed circuit board 6 (fig. 12). The conductors 17, 18 and the electronic assembly of the power electronic component 1 thus lie substantially in a plane extending perpendicular to the axial direction of the stator. The connection between the power electronics components, i.e. their printed circuit board 6, and the heat sink 10 and the conductor section 20 arranged behind it is effected as described in connection with fig. 1 and 2.

Fig. 13 shows a design example in which the conductors 17, 18 are not designed annularly, but are guided as conductor track sections from the power electronic component 1 to the adjacent power electronic component 1'. Thereby, a larger area is available for applying electronic components to the printed circuit board 6 of the component 1, 1'.

Fig. 14 shows a design variant in which the semiconductor switches 2, 3 and the optional driver circuit 4 are arranged in the interior of the multilayer printed circuit board 6. This allows the conductors 17, 18, 23 to be applied over a large area on the two opposite surfaces.

In the design example shown in fig. 15, the conductor 17 and a further conductor 19, for example an ac voltage conductor, are applied here on the underside in the plane of the plate (Blattebene). On the upper side in the board plane of the printed circuit board 6, conductors 18 are arranged. The already described cooling body 10 is in turn arranged on the conductor 18.

In order to avoid the transmission of vibrations from the conductor section 20 to the power electronic component 1, the conductor section 20 can expediently be connected to the respective contact portion (screw, bushing, connection) via a flexible wire, a wire or a conductor cable.

In a further embodiment, which is not shown in the figures, the semiconductor switches 2, 3 and the optional driver circuit 4 can be provided with cooling bodies on both sides.

In a further embodiment, which is not shown in the figures, the power electronics component 1 with the electronic components (semiconductor switches 2, 3 and optionally the drive circuit 4) can be applied to the heat sink 10 in advance.

Furthermore, combinations of the variants are possible.

Semiconductor switches are in particular power semiconductors. All transistor variants, in particular IGBTs, MOSFETs, JFETs, etc., can be used here.

List of reference numerals

1 Power electronic component

2 semiconductor switch

3 semiconductor switch

4 drive circuit

5 electronic component

6 printed circuit board

6A substrate

6B insulator

6C conductor plane/conductor track structure

7 screw

8 gasket

9 drill/recess

10 Cooling body

11 first side of the cooling body

12 second side of the cooling body

13 hollow/bore

14 fluid channel

15 hollow part

16 cooling tank

17 conductor (DC bus)

17A hollow part

18 conductor (DC bus)

18A hollow part

19 conductor (AC)

20 conductor segment

21 sleeve

22 internal thread

23 connecting piece (L shape)

24-bit plate

25 screw

26 Cooling tank