Power electronic assembly and motor

Abstract

The invention relates to a power electronic assembly (2) having a plurality of power electronic components (4) arranged on a plurality of printed circuit boards (15), at least two printed circuit boards (15) being arranged on at least two cooling plates (16) arranged parallel to one another, each having two cooling surfaces (6) parallel to one another, the cooling plate (16) is provided with at least two through holes perpendicular to the cooling surface (6), at least two rods (20) are provided, the rods (20) penetrate through the cooling plate (16) at the through holes (22), and the through holes (22) are communicated with the cooling surface (6) through the cooling plate (16). A locking device (24) for fixing the cooling plate (16) along a rod axis (26) is provided on the rod piece (20), and a support rod (28) is arranged between each two opposite printed circuit boards (16), and a pretension is effected along the rod axis (26) by means of the locking device (24), the support rod (28) counteracting the pretension, in this way, the printed circuit board (15) is pressed onto the opposite cooling surfaces (6) of the respective two cooling plates (16).

Description

[0001] The invention relates to a power electronics assembly and an electric motor having a stator-side bar winding.

[0002] The electric motor can have a rod winding on the stator side. The stator has a series of rods instead of wound conductors as field conductors. Compared to conventional windings, the rods have a lower inductance. Therefore, relatively large currents are required to generate a defined magnetic field. EP 3 719 975 A1 discloses an electric motor of this type.

[0003] However, due to the low inductance of the rod, this relatively high current only requires a relatively low voltage of, for example, 12 V. The low voltage allows the components of the inverter for controlling the rod to be arranged at a small distance from one another. The modules of the power electronics can be arranged, for example, on one or more circuit boards (printed circuit boards) which are arranged in the vicinity of the electric motor. The rod-shaped windings of the electric motor can be used directly or directly as a mechanical carrier for the circuit board via electrically conductive rod-shaped connecting elements.

[0004] Since the power electronics must be cooled, according to the prior art, the power electronics are equipped on both sides on two water-cooled cooling plates and are thus cooled. The greater the current, the more such cooling plates and power electronics plates must be connected in series. If a machine has, for example, 96 phase bars, an inverter plate has 96 individual inverters (however, the electronics of several phases can be located on one circuit board). If four individual inverters are to be connected in parallel, the complete inverter consists of 384 individual power electronic modules. The cooling plates and the power electronic modules mounted on the cooling plates are mechanically connected to one another and together form a power electronic assembly.

[0005] In terms of construction technology, according to the prior art, the power electronic module (printed circuit board) is individually screwed to the heat sink to ensure good contact pressure between the electronic device and the cooling plate, and thus to ensure good heat transfer. However, due to the large number of screws, this means high material and manufacturing costs, and the threaded holes in the cooling plate also require multiple manufacturing steps and complicate the design of the cooling channels in the cooling plate. In addition, the space on the power electronic module is extremely limited, and since the screw holes, including the necessary clearances and creepage distances, require significant space, the printed circuit board area available for the power electronic device itself is small. Loose screws can also lead to short circuits in the inverter, so avoiding the use of such screws can also provide higher reliability.

[0006] The above-mentioned manufacturing costs are not only generated during the production process, but also every time the drive system is maintained. The system is designed in particular so that (similar to the high-voltage direct current transmission system) a certain number of individual modules can fail without causing significant restrictions on the operating capacity, and these modules can be replaced after a certain period of time during periodic maintenance. Therefore, the maintenance requires a lot of time to loosen and tighten such a large number of screws. The construction and maintenance problems of power electronic components are explained here by way of example for rod-type winding motors, but these problems may also occur in other power electronic device applications, such as the above-mentioned high-voltage direct current transmission system.

[0007] The technical problem to be solved by the present invention is to provide a power electronic component which has a lower construction and maintenance complexity than the prior art. The technical problem is also to provide an electric motor in which a corresponding power electronic component is integrated in terms of construction technology.

[0008] The solution to this problem lies in the following power electronic assembly, which has a plurality of power electronic components arranged on a plurality of printed circuit boards. At least two printed circuit boards are arranged on at least two parallel cooling plates, each of which has two cooling surfaces parallel to each other, wherein at least one printed circuit board is arranged on the cooling surfaces of the cooling plates facing each other. For optimized construction space utilization, the two printed circuit boards are preferably arranged opposite each other with the cooling surfaces facing each other. The cooling plates here again each have at least two through holes, which are opened perpendicular to the cooling surfaces. In addition, at least two rods are provided, which pass through the cooling plates at the through holes, and locking devices are provided on the rods, which are used to fix the cooling plates along the rod axis. This means that the locking structure fixes the cooling plates along the rod axis together with the printed circuit boards arranged thereon, so that the cooling plates are arranged firmly at a certain distance from each other. In addition, support rods are arranged between the opposite printed circuit boards, wherein prestressing is achieved along the rod axis by means of the locking device, and the support rods resist the prestressing effect. The preload is thus transmitted to the support rods with an opposite sign, as a result of which the printed circuit board is pressed against the cooling surfaces of the at least two cooling plates which are respectively situated opposite one another.

[0009] The combination of the locking device and the support rod, which remains unchanged in the assembled state of the power electronic component, makes it unnecessary to have multiple separate threaded connections. The support rod presses the printed circuit board onto the cooling plate, and no additional threaded connection is required for this purpose. The locking device can also be designed here so that only one fixing device is required in the case of multiple cooling plates, for example, a fixing device in the form of a threaded connection. When constructing or maintaining the power electronic component, for example, it can be placed in an assembly device and disassembled by loosening some fixings, such as screws, so that individual circuit boards can be removed and replaced without taking a lot of time. Compared with the prior art, the construction and maintenance costs of the power electronic component are significantly reduced. In addition, fewer screws are required to fix the printed circuit board to the cooling plate, thereby saving material costs and assembly costs, and allowing the design of the cooling channel in the cooling plate to have greater freedom. This in turn makes it possible to cool the component more effectively and improves the performance of the component.

[0010] The cooling plate is preferably designed as an annular or circular shape when used for an electric motor to be described, and the cooling plate has two approximately parallel cooling surfaces. The cooling surfaces are parallel to each other on the opposite sides of the cooling plate. The cooling surface itself can have a surface structure that is advantageous, for example, for accommodating a printed circuit board or for reasons of cooling technology. The cooling surface itself therefore does not have to be completely flat. However, the cooling surface has a substantially flat surface that is parallel to the cooling surfaces that are opposite to each other.

[0011] In an advantageous embodiment of the invention, the support rod is designed to be resiliently deformable along the force application axis. The resilience can be achieved, for example, by material elasticity, for example by using an elastomer as part of the support rod, or by a mechanical spring element such as a helical spring or a leaf spring. The force application axis of the support rod can advantageously extend parallel to the rod axis and thus to the action axis of the applied preload. However, if the support rod is arranged, for example, in the form of a support extending in a V-shaped or W-shaped manner, the force application axis of the support rod can also be at a certain angle to the rod axis.

[0012] As already mentioned when specifying the parallelism of the cooling surfaces, the cooling surfaces can have fixing means for fixing the printed circuit board relative to the cooling surfaces. These fixing means can be recesses into which the printed circuit board is inserted, or protruding bumps or keys into which corresponding recesses on the circuit board snap, similar to the Lego principle.

[0013] In an advantageous embodiment of the invention, the locking device of the rod has a threaded connection. Such a threaded connection can be designed so that only one screw is required per rod for a plurality of cooling plates. The rod preferably has a thread at least partially, on which a nut can be mounted to form the threaded connection.

[0014] In principle, however, the locking can alternatively also be achieved by wedging instead of threading, but it is advantageous if the fixing of the locking device is releasable. For example, the wedging can be achieved by a transverse cotter pin. In addition, the locking can also be achieved by squeezing other components, such as end caps. It is also possible to use a clamping device extending around the component as part of the locking device. For example, a tensioning belt device or a spiral clamp device are suitable here. In a tensioning belt device, at least one belt-like or belt-like component is arranged around the component and is tightened, for example, by a ratchet, so that a fixing effect is formed. Alternatively, a fixing device such as a spiral clamp or a lever clamp can also be installed from the outside as part of the locking device for fixing.

[0015] It is also expedient if the locking device comprises a spacer sleeve which is pushed onto the rod between two cooling plates. These spacer sleeves serve to precisely adjust the distance between the respective cooling plates, wherein these spacer sleeves make it possible to dispense with further threaded connections or nuts on the cooling plates. This spacer sleeve concept helps to ensure that the requirements can be met as much as possible with one fastening device, i.e. one threaded connection.

[0016] In an advantageous embodiment, an alternative to the spacing sleeve is that the rod has a diameter that changes in a step-like manner. The cooling plates can be stacked one after another on the rod designed in this way. It is expedient here that the through-holes also decrease from one cooling plate to the next cooling plate with the step-like change in the diameter of the rod.

[0017] If, for example, locking means are provided on a step of the sleeve or the rod, which locking means have an extension along the cooling surface in the region of the through-opening, the support rod can also correspond in design to the rod or the locking means.

[0018] In a preferred embodiment, in particular when used in an electric motor, the printed circuit board is designed in the form of a circle or an annular sector and thus also advantageously corresponds to an annular or circular cooling plate.

[0019] A further aspect of the invention is an electric motor having a stator with a plurality of field conductors designed as bars and a power electronic component according to one of claims 1 to 9 , wherein the field conductors are electrically connected to the power electronic component.

[0020] The advantage of this motor is that, in particular at very low voltages and very high applied currents of the rod-shaped conductor motor, the power electronics can be arranged directly in parallel with the motor and integrated with the motor. The advantages of power electronics in terms of construction and maintenance are particularly applicable to this type of motor.

[0021] The motor differs from conventional motors in that the stator field conductor is a series of rods rather than wound conductors. The rods have a lower inductance than conventional windings. Therefore, a relatively large current is required to generate a specified magnetic field.

[0022] The construction of the rod windings creates fundamental advantages for the operation of the machine: Compared to distributed windings and their inherent superposition effects, the segmented controllability of the magnetic flux between each two field conductors enables a more flexible magnetic field form to be formed in the machine. This results in many (control technology) advantages in the operating characteristics of the machine. In addition, compared to double three-phase or even ordinary three-phase machines, the consequences of a failure in one phase (field conductor (control)) are much smaller. Since the adjacent phases are also able to compensate these effects very well, in the case of corresponding control, the failure of each phase only reduces the drive power by a small part, without having a significant impact on the remaining characteristics.

[0023] Based on the above-described construction scheme of the electric motor, it is suitable here that the rod of the power electronic component is designed in the form of a current conductor electrically connected to the field conductor. This means that the rigid field conductor of the electric motor can also be directly and firmly connected to the power electronic component by means of the rod to conduct the current. As a result, the rod, which is used for the advantageous construction of the power electronic component on the one hand, also takes on the function of conducting the current of the component to the field conductor of the electric motor. For this purpose, a fixing device between the field conductor and the rod (current conductor), for example a fixing device in the form of a fixing shoe, is suitable. In this way, the power electronic component can be directly and firmly arranged on the electric motor and, if necessary, integrated in a common housing.

[0024] The power electronics of the assembly are used here to control the field conductors. The power electronics are connected in parallel along the individual cooling plates and along the motor axis, so that the power electronics assembly can control each field conductor with its own phase. It is also expedient here for the cooling plates to be arranged perpendicular to the axis of the motor, i.e. the motor axis. This allows the construction of the motor together with the power electronics assembly to be designed in a particularly space-saving manner.

[0025] Other designs and other features of the present invention are described in detail according to the following drawings. The features with names shown in different designs are respectively provided with the same reference numerals. Each view is a purely schematic view and does not constitute a limitation on the scope of protection.

[0026] In the attached picture:

[0027] Figure 1 An electric motor with a rod-shaped conductor winding and power electronic components connected thereto are shown.

[0028] Figure 2The electric motor is shown in front view,

[0029] Figure 3 Shown in side view Figure 1 An enlarged view of a partial area of ​​a power electronics component is shown,

[0030] Figure 4 A schematic diagram showing a construction of a power electronics assembly having a rod and a support rod,

[0031] Figure 5 Shown with Figure 4 A similar view, where the printed circuit boards in multiple planes for each module are stacked up,

[0032] Figure 6 A schematic diagram showing a screw connection of a locking device on the end side of a power electronic component,

[0033] Figure 7 shows a schematic diagram of a rod having a stepped decreasing diameter, and,

[0034] Figure 8 A schematic diagram showing an alternative design of a support rod is shown,

[0035] Fig. 9 An assembly with a support rod which is part of a locking device is shown,

[0036] Fig.10 An assembly is shown, which has a tensioning belt type fixing device with a locking device,

[0037] Fig.11 An assembly is shown having a screw-clip type fixing arrangement of the locking device.

[0038] The following figures describe an advantageous design of a power electronics assembly which is preferably integrated in a rod-type conductor motor. This is a particularly suitable application, although it can also be transferred to other applications, for example in the field of high-voltage direct current transmission.

[0039] Figure 1 FIG. 1 shows an isometric view of an electric motor 10 as one embodiment of the present invention. The electric motor 10 includes a stator 11 and a rotor substantially arranged in the stator. Figure 1 The rotor cannot be seen in the figure. The rotor is connected in a rotationally fixed manner to the shaft, which is also not shown. Figure 1 The rotor is shown in FIG. The rotor is rotated about the axis 9 by the electromagnetic interaction between the rotor and the stator 11 to which power is supplied. The rotor is separated from the stator 11 by an air gap.

[0040] In other embodiments, the motor 10 may also be an outer rotor motor or a bell-type armature motor.

[0041] The stator 11 includes a plurality of rigid and straight conductor bars 12 as field conductors. Figure 1 The conductor bars 12 are connected to each other by short-circuit rings on the end faces 13 facing away from each other. The conductor bars 12 are powered separately on the back side 14 of the motor 10 through the inverter modules respectively assigned thereto. The inverter module is a component of the power electronic assembly 2. Due to the conductor bars 12, the motor 10 operating at a low voltage is involved, so the inverter module can be arranged relatively closely together with other components of the electronic device (DC / DC converter, rectifier) ​​on the printed circuit board 15. In the example described, the printed circuit board 15 is in the shape of an annular sector, and a plurality of individual circuit boards 15 together form an annular circuit board structure. The rigidly constructed conductor bars can be composed of metal bars, such as copper bars or solid multi-filament conductors.

[0042] In the example, it is assumed that the printed circuit board 15 has an inverter module, but it is also possible that part of the printed circuit board 15 has a rectifier and a DC / DC converter.

[0043] Figure 2 1 shows a top view of a circuit board structure with individual printed circuit boards 15. Figure 1 Compared to the view in Figure 2 The number of printed circuit boards 15 shown here is reduced and greatly simplified for the sake of clarity. The specific number of such printed circuit boards 15 depends on the specific design of the electric motor 10, in particular the number of conductor bars 12. Each printed circuit board 15 includes a plurality of power electronic components, in particular semiconductor switches.

[0044] In addition, part or all of the circuit board 15 may include a driver circuit and other electronic components not shown in the figure, such as a capacitor. The semiconductor switch 26 is a power semiconductor, such as an IGBT, a MOSFET or a JFET, and may also include an additional diode not shown depending on the connection situation. The semiconductor switch 26 is connected as a half bridge, for example. The capacitor not shown can be, for example, an intermediate circuit capacitor of the half bridge. The semiconductor switch 26 of the circuit board 15 can be assigned to a single phase or to multiple phases.

[0045] The printed circuit board 15 further comprises contact locations 40 to which the conductor bars 12 are connected. The circuit board 15 is carried by a disc-shaped cooling plate 16, wherein both sides of the cooling plate 16 are occupied by the circuit board 15 for better utilization of space.

[0046] Since a relatively large current is required in the conductor bar 12 in the electric motor 10 compared to conventional electric motors with windings, it is preferred to connect a plurality of inverters in parallel to energize the conductor bar. This can be achieved, for example, by ensuring that Figure 1The six circuit board structures on the three cooling plates 16 shown in the figure are all connected to the conductor bars 12 in the same way and are thus electrically connected in parallel. It is utilized here that the conductor bars 12 or the connecting elements 18 connected to the conductor bars 12 pass through the cooling plates 16 and thus also pass through the circuit board 15 at the contact point in the same way, or at least contact the circuit board in the case of the outermost cooling plates 16.

[0047] Figure 3 The oblique view shows a sectional view of the electric motor 10. It can be seen here that the connecting element 18 is mechanically supported and passes through three cooling plates 16. The connecting element 18 is connected to the conductor bar 12 via a fastening device 17. The inverters located on the printed circuit board 15 in the area where one of the connecting elements 18 passes through the cooling plate 16 are connected in parallel and jointly supply the conductor bar 12 with current.

[0048] Especially by Figure 3 The example of an electric motor 10 with a rod winding in FIG. 1 shows the complexity of the design of the construction of the power semiconductor components. The cooling plate 16, the printed circuit board 15, the connecting elements 18 for conducting the current and, if necessary, the current busbars 48 for contacting the printed circuit board are screwed together and assembled separately. This means that the initial installation and maintenance of the power electronic components require a very high assembly effort. Figure 4 An example is given of how the assembly effort of the power electronics assembly 2 can be significantly reduced. Figure 4 The power electronic assembly 2 of the embodiment shown here has two cooling plates 16, on whose cooling surfaces the printed circuit board 15 rests, and the power electronic assembly shown here is shown very schematically and simplified for better illustration. The term "resting" here means that the printed circuit board 15 does not necessarily have to be fixed to the cooling surface 6.

[0049] The printed circuit board can be placed precisely in the correct position. However, it is also suitable to provide a fixing device 50 in principle, which ensures the precise positioning and pre-fixing of the printed circuit board 15 on the cooling surface 6. The fixing device 50 can be, for example, a recess into which the printed circuit board 15 is placed, or a knot extending into a groove of the printed circuit board 15. However, in this design, the threaded connection of the printed circuit board 15 on the cooling surface 6 is unnecessary. This makes the work required when assembling or disassembling the printed circuit board 15 less. Therefore, the printed circuit board 15 is pressed against the cooling surface 6 and therefore against the cooling plate 16 by the support rod 28 during the assembly process and in the assembled state.

[0050] However, this requires a corresponding contact pressure, which is Figure 4In the figure, the force arrows with reference numeral 27 are shown. This involves a preload on the rod 20, which passes through the individual cooling plates 16 and through the through-holes 22 there, and in accordance with Figure 4 In the example shown, the outermost cooling plate 16 is screwed via a screw connection 32. The rod 20 is designed here as a metal rod, wherein a spacer sleeve 34 is pushed onto the rod 20 in the gap between two cooling plates 16, which ensures a defined distance between the plates 16 or the printed circuit boards 15 fastened thereto due to its defined length.

[0051] Since the spacing sleeve 34 has a larger diameter than the through hole 22, a preload 27 is achieved on the assembly of the cooling plate 16 by tightening the screw connection 32. The preload 27 is thus transmitted with an opposite sign to the support rod 28, which, as a direct active structure, presses the printed circuit board 15 onto the cooling surface 6. A force action axis 30 is defined here, which is located at Figure 4 The rod axis 26 in turn corresponds to the direction of action of the force 27. However, the force action axis 30 of the support rod 28 can also be as Figure 8 As schematically shown, it is at an angle to the rod axis 26 .

[0052] Therefore, the power electronic component 2 Figure 4 As can be seen from the schematically illustrated construction in FIG. 1 , almost any number of cooling plates with printed circuit boards 15 resting thereon can be stacked side by side or one above the other. Figure 4 As shown, only one threaded connection 32 is required in the design. The threaded connection 32 and the spacer sleeve 34 form the locking device 24.

[0053] Figure 7 An alternative design of the locking device 24 is shown. In this case, there is a threaded connection 32, wherein the rod 20 has a thread 36 on the end side, which in this respect is similar to Figure 4 Designed similarly. However, according to Figure 7 The rod 20 does not have a spacing sleeve 34; instead, a constant distance between the two cooling plates 16 is achieved by a stepped tapering along the rod axis 26. For this purpose, it is necessary that the diameter of the through-holes 22 of the individual cooling plates 16 along the rod axis 26 is also reduced accordingly, so that the corresponding step of the rod 20 rests on the printed circuit board 15 and there preferably at a contact point, which is also electrically conductive. Figure 7 The design described is technically more Figure 4 The locking device 24 is more complicated, but a more effective electrical contact between the rod 20 and the contact portion 40 can be achieved by applying the preload force 27 .

[0054] The contact 40 between the rod 20 and the printed circuit board 15 described is significant in that the rod 20 simultaneously forms Figure 3 The connecting element 18 is shown in detail. Figures 4 to 8 The locking device 24 schematically shown in FIG. Figure 3 is shown in this form. Figure 3 It is also shown how an electrically conductive connecting element 18 is electrically conductively connected to the conductor bar 12 of the electric motor 10 via the fastening device 17. The connecting element 18 and thus the rod 20 are therefore used to supply the conductor bar 12 with electrical power. Figures 4 to 8 The power electronic assembly 2 described herein utilizes this and uses the connecting elements 18 necessary for the current input and control of the rod 20 as the rod 20, so as to advantageously assemble the Figure 4 and Figure 5 The power electronics assembly 2 can thus be connected directly to the electric motor 10 or its conductor bars 12 and is thus an integral component of the electric motor 10. The power electronics assembly can optionally also be accommodated together with the electric motor 10 in a housing (not shown here).

[0055] It can be seen from this that it is expedient to provide each conductor bar with a connecting element 18 or a rod 20, each with a fixing device 24. With this arrangement, the rotationally symmetrically designed power electronics assembly 2 is arranged on the axis 9 of the electric motor 10. The connecting elements 12 also extend along this axis or parallel to this axis. The printed circuit boards 16, which are respectively connected in parallel via the connecting elements 12, are used here to control the stack 12. With this parallel connection, high currents can be directly transmitted to the conductor stack 12 at low voltage. In addition, each stack 12 can also be controlled individually as an individual phase.

[0056] The printed circuit board 15 includes various power electronic components. The so-called gate driver 44 and the output stage 46 together form a power unit. A plurality of power units with control devices in turn form an inverter. These components or component modules can be integrated in the printed circuit board 15, but can also be constructed in multiple stages or in multiple levels. Figure 5 4 shows such a layered structure of a printed circuit board 15. The gate driver 44 is arranged in a different printed circuit board 15 than the output stage 46, for example. The two printed circuit boards 15 are arranged one on top of the other, which is Figure 5 The power electronic component 2 is constructed with Figure 4 Similarly, it is solved that further smaller support rods 28 are only required when necessary to support the printed circuit boards 15 stacked on top of each other.

[0057] against Figure 5 as well as Figure 4The support rods 28 in the embodiment are preferably resiliently deformable along their force application axis 30. This helps to compensate for any tolerances in the overall construction and prevent damage to the printed circuit board 15. The elastic element can be material-dependent, for example an elastomer can be used as a spring element, but a separate spring element such as a helical spring or a leaf spring can also be used.

[0058] Figure 6 An example of a fastening device with a special design at the end of the screw connection is shown. It is also expedient here to press the printed circuit board 15 against the cooling surface 6 using elastic elements, in this case in the form of end supports 38, in order to avoid bending stresses on the printed circuit board 15. This can also be achieved in principle by means of a screw connection 32. The arrangement of the end supports is advantageous in ensuring the stability of the printed circuit board 15 and in achieving a better planar and uniform distribution of force.

[0059] However, the fixing device 24 is, for example, Figure 6 The end-side fixation achieved by the threaded connection 32 can alternatively also be achieved by tensioning the rod 20 at an end cap of the electric motor 10, which is not shown in the figure. The end cap is usually also screwed to the housing of the electric motor 10, so that the threaded connection can also be indirectly considered as a component of the fixing device 24.

[0060] In addition, it should be noted that Figure 3 As shown, the current busbar 48 can be arranged between the cooling plate 16 and the printed circuit board 15 in a recess (not shown here) of the cooling plate 16, which is shown for the sake of clarity. Figures 4 to 8 These current busbars 48 are also in contact with contacts in the printed circuit board 15 with a certain contact pressure by means of the preload force 27 of the locking device 24, which contacts are also not shown here. If necessary, additional screw connections are also not required for these busbars 48, which are necessary in the prior art designs.

[0061] Thus, compared to the prior art, the described approach for constructing or maintaining a power electronic assembly 2 significantly reduces the number of necessary screw connections, which means that only a few screws need to be removed to loosen and reassemble the assembly. The assembly effort is therefore significantly lower than the designs taught in the prior art. Furthermore, a faulty printed circuit board or a faulty power electronic assembly in the assembly 2 can be replaced if necessary.

[0062] Fig. 9A power electronics assembly 2 is schematically shown in cross section, wherein the support rod 28 is designed as part of a sleeve 34. The support rod is thus integrated into the locking device and has a planar widening in the cooling surface plane for supporting a printed circuit board 15. In this figure, the printed circuit boards are arranged, by way of example, for the case of opposing cooling surfaces 6, such that no printed circuit board is directly opposite another printed circuit board 15. However, in order to optimize the available installation space, the printed circuit boards 15 are usually arranged opposite each other.

[0063] Fig.10 An example is given, that is, the tension-belt-like locking structure of the cooling plate 16 of the assembly 2 can be part of the locking device 24. The sleeve 34 is used here as a further part of the locking device 24. In addition, a tension-belt-like belt 52 is arranged around the assembly 2 and is fixed, i.e. locked, by a ratchet not shown in detail.

[0064] Alternatively, Fig.11 The locking is achieved schematically by a screw-clip-type fixing arrangement. For this purpose, a screw clamp 54 or a lever clamp is provided along the rod axis 26 and fixes the assembly 2. Figures 4 to 11 A combination of views is also appropriate.

[0065] Reference numerals list

[0066] 2 Power Electronics

[0067] 4 Power Electronics

[0068] 6 Cooling surface

[0069] 8 Stator / rotor assembly

[0070] 9 Motor axis

[0071] 10. Electric Motor

[0072] 11. Stator

[0073] 12 Conductor rod

[0074] 13 End side

[0075] 14 Dorsal

[0076] 15. Printed Circuit Board

[0077] 16 Cooling Plate

[0078] 17 Fixtures

[0079] 18 Connecting elements

[0080] 20 Rod

[0081] 22 Through Holes

[0082] 24 Locking device

[0083] 26 Rod axis

[0084] 27 Preload

[0085] 28 Support rod

[0086] 30 Axis of force application

[0087] 32 Threaded connection

[0088] 34 Sleeve

[0089] 36 Thread

[0090] 38 End support

[0091] 40 Contact Department

[0092] 42 Connection thread

[0093] 44 Gate Driver

[0094] 46 Final

[0095] 48 Current bus

[0096] 50 Printed circuit board fixing structure

[0097] 52 tension band locking structure

[0098] 54 Screw-clip locking structure

Claims

1. A power electronic component (2), the power electronic component having - a plurality of power electronic components (4), The power electronic components are arranged on a plurality of printed circuit boards (15), wherein: - at least two printed circuit boards (15) are arranged on at least two cooling plates (16) arranged parallel to one another, each of the cooling plates having two cooling surfaces (6) arranged parallel to one another, - so that at least one printed circuit board is arranged on mutually facing cooling surfaces of the cooling plate, - the cooling plates (16) each have at least two through-holes perpendicular to the cooling surface (6), wherein at least two rods (20) are provided, which pass through the cooling plate (16) at through holes (22), and locking devices (24) are provided on the rods (20) for fixing the cooling plate (16) along a rod axis (26), and - a support rod (28) is arranged between two opposite printed circuit boards (16), and A prestressing is achieved along the rod axis (26) by means of a locking device (24), the support rod (28) counteracting the prestressing and thereby pressing the printed circuit board (15) respectively onto the opposite cooling surfaces (6) of the two cooling plates (16).

2. The power electronic component according to claim 1, characterized in that The support rod (28) is designed to be resiliently deformable along a force action axis (30) of the support rod (28).

3. The power electronic component according to claim 1 or 2, characterized in that: A fixing device (50) for fixing the printed circuit board (15) relative to the cooling surface (6) is arranged on the cooling surface (6).

4. The power electronics assembly according to claim 1, characterized in that The locking device (24) of the rod (20) comprises a threaded connection (32).

5. The power electronic component according to claim 4, characterized in that: The rod (20) is at least partially provided with a thread.

6. The power electronics assembly according to claim 1, characterized in that The locking device (24) comprises a spacer sleeve (34) which is pushed onto the rod (20) between two cooling plates (16).

7. The power electronic component according to any one of claims 1 to 5, characterized in that The rod (20) has a diameter that changes in a step-like manner.

8. The power electronics assembly according to claim 1, wherein: The printed circuit board (15) is designed in the shape of a circle or a ring sector, and the cooling plate (16) is designed in the shape of a ring or a circle.

9. An electric motor (10) having a stator (11) having a plurality of field conductors (12) designed as bars and a power electronic component (2) according to one of claims 1 to 8, -in, The field conductor (12) is electrically connected to the power electronic component (2).

10. The electric motor according to claim 9, characterized in that The rod (20) of the power electronic component (2) is designed in the form of a current conductor (18) which is electrically connected to the field conductor (12).

11. The electric motor according to claim 10, characterized in that The rod (20) of the power electronics component (2) is directly connected to the field conductor (12) by means of a fastening device (17).

12. The electric motor according to any one of claims 9 to 11, characterized in that The power electronics (4) is designed to control the field conductor (12).

13. The electric motor (10) according to any one of claims 9 to 12, wherein: The cooling plate (16) is arranged perpendicular to the axis (9) of the electric motor (10).

14. The electric motor (10) according to any one of claims 9 to 13, characterized in that The power electronics assembly (2) is designed to control a field conductor (12) each with its own phase.

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