Compression limiter for a converter arrangement in a rotor of an electric machine

Abstract

The present invention relates to a compression limiter (133) for a converter arrangement (120) for providing a DC excitation current in a rotor (118). The converter arrangement (120) has a transformer unit (128) having a primary winding and a secondary winding (131) and has a rectifier connected downstream of the transformer unit (128), the secondary winding (131) being attached to a winding support (130), and the rectifier being accommodated by a rectifier housing (132). The compression limiter (133) comprises, for fastening the winding support (130) to the rectifier housing (132), a flange portion (135) and an insertion part (134) extending in a longitudinal direction from the flange portion (135), and the compression limiter (133) has a longitudinal slot (138) which extends continuously from the insertion part (134) into the flange portion (135). The present invention further relates to a converter arrangement (120) having such a compression limiter (133), to a rotor (118), to an electric motor (102), and to an at least partially electrified vehicle (100).

Description

[0001] Compression limiter for a converter arrangement in a rotor of an electric machine

[0002] The present invention relates to a compression limiter for a converter arrangement for providing a DC excitation current in a rotor of an electric machine. The present invention further relates to a converter arrangement, a rotor, an electric machine, and an at least partially electrified vehicle.

[0003] Fully electric vehicles and hybrid vehicles are known from the prior art. These electric vehicles are powered exclusively or partially by one or more electric motors as drive units.

[0004] Electric axle drives for purely electric vehicles and hybrid electric vehicles are known from the prior art. Such drive systems generally comprise an electric motor with a stator and a rotor rotatably mounted in the stator. The stator has several stator windings, known as phase strands, each of which is supplied with a corresponding phase current during operation. The phase currents are phase-shifted relative to each other, such that the current flowing through the stator windings generates a rotating magnetic field. The rotor has a rotor shaft and a rotor core fixed to the rotor shaft, in which magnetically active components are mounted. The magnetic interaction between the rotor on the one hand and the rotating field on the stator side on the other generates a torque that sets the rotor in rotation.

[0005] The magnetic effect of the rotor can be provided by one or more permanent magnets. Accordingly, this is a permanent magnet synchronous machine. Alternatively, the rotor can use an electromagnet with a rotor coil, resulting in a separately excited or electrically excited synchronous machine (FESM / EESM), in particular an inductively excited electrically excited synchronous machine (IEESM). In the case of an FESM / EESM or IEESM, it is necessary to supply the rotor coil with a direct current (DC current). For this purpose, converter systems are used in the prior art to first convert a DC input voltage into a primary-side AC voltage. The latter is then converted, according to the transformer principle, into a secondary-side AC voltage and finally into a DC output voltage adapted to the rotor. A DC excitation current is generated from the DC output voltage to energize the rotor coil and thus produce the desired rotor magnetic field.

[0006] Specifically for voltage conversion according to the transformer principle, transformers known from the prior art are equipped with a primary winding and a secondary winding, so that the primary-side AC voltage, after being fed into the primary winding, is converted into the secondary-side AC voltage, which is applied to the secondary winding, according to the winding ratio between the primary and secondary windings. A rectifier is also connected downstream of the secondary winding, which converts the secondary-side AC voltage into the desired DC output voltage.

[0007] However, existing transformer systems and devices have several disadvantages that impair the functionality of the electric drive. For example, it is known to attach the secondary winding to a plastic winding support using screws, which in turn is mounted to a housing for the rectifier to create a so-called rotary transformer with a rotating secondary winding. However, this often leads to over-tensioning of the plastic material of the winding support. Furthermore, centering and positioning the winding support and the overall arrangement of the transformer system during rotor manufacturing is inherently difficult due to the design.

[0008] The object of the present invention is therefore to provide a compression limiter for a converter arrangement with which the aforementioned disadvantages are at least partially overcome. The above-mentioned technical problem is solved by a compression limiter, a converter arrangement, a rotor, an electric machine, in particular an inductively excited synchronous motor, and an at least partially electrified vehicle according to the main claim and the dependent claims. Advantageous embodiments are the subject of the dependent claims. The advantages described in connection with the claims relating to the compression limiter also apply to the converter arrangement, the rotor, the electric machine, and the vehicle according to the invention.

[0009] The present invention relates, in a first aspect, to a compression limiter for a converter arrangement for providing a DC excitation current in a rotor. The rotor comprises a rotor coil which is supplied with the DC excitation current to generate a constant rotor magnetic field. The converter arrangement comprises a primary side and a secondary side connected downstream of the primary side. To provide the DC excitation current, the converter arrangement is configured to convert a primary-side AC voltage into a DC output voltage that is adapted to the desired DC excitation current. Accordingly, the converter arrangement includes a transformer unit with a primary winding and a secondary winding, and a rectifier connected downstream of the transformer unit. The secondary winding is mounted on a winding support (or winding head), which is preferably made of a plastic material.The rectifier is housed in a rectifier casing, preferably made of a metal, such as aluminum. Based on the winding ratio between the primary and secondary windings, the primary-side AC voltage applied to the primary winding is first converted into a secondary-side AC voltage. The primary-side AC voltage is generated, for example, by an inverter comprising several semiconductor-based power switches connected in a bridge configuration and preferably forming an integral part of the primary side, from a DC input voltage. The secondary-side AC voltage is then fed to the rectifier, which preferably comprises several diodes also connected in a bridge configuration and generates the DC output voltage by switching the diodes based on the secondary-side AC voltage.

[0010] The converter arrangement is preferably designed as a rotary transformer, in which the primary side is stationary, in particular fixed in position relative to the stator, and the secondary side is rotatable, in particular fixed in rotation relative to the rotor. In this case, the primary winding of the transformer unit, and preferably also the inverter belonging to the primary side, is arranged stationary, while the secondary winding and the rectifier are arranged rotatably. In particular, such a rotary transformer is achieved on the secondary side by mounting the winding support, to which the secondary winding is attached, and the rectifier housing, in which the rectifier is housed, on the rotor in a rotationally fixed and thus rotatable manner.

[0011] To ensure the functionality of the converter assembly during operation of the electric motor, secure fixing of the winding carrier to the rectifier housing is essential. This is particularly important when the converter assembly is designed as a rotary transformer, since in this case the components belonging to the secondary side, including the secondary winding of the transformer unit and the rectifier, must be arranged in a rotationally fixed manner relative to the rotor and thus also to each other. At the same time, when fixing the winding carrier, preferably made of plastic, to the rectifier housing, preferably made of metal, overstressing of the plastic material, which frequently occurs when using common fasteners such as screws, should be avoided or at least limited below a threshold value.

[0012] According to the invention, this is achieved with a compression limiter which, when installed, is inserted into a guide opening formed in the winding carrier of the secondary winding. The compression limiter comprises a flange section with a bearing surface which, when the compression limiter is installed, faces a top surface of the winding carrier in a flush manner. Furthermore, the compression limiter comprises an insertion part which extends longitudinally from the flange section and, when installed or inserted into the guide opening, along the guide opening of the winding carrier. The guide opening is preferably a through-hole through which the insertion part passes when installed. This enables secure and simplified positioning of the winding carrier on the rectifier housing. The flange section is dimensioned larger in a transverse direction than the insertion part.In this way, the compressive forces acting on the upper surface of the winding carrier (where it is fixed to the rectifier housing by means of the compression limiter) when installed can be distributed over a larger contact area between the compression limiter and the winding carrier. This prevents or at least reduces overstressing of the plastic material of the winding carrier at the contact surface.

[0013] The compression limiter also features a longitudinal slot that extends continuously from the insert to the flange section. This longitudinal slot has two partial longitudinal slots, one in the flange section and the other in the insert, with both partial longitudinal slots merging seamlessly into each other. Providing such a longitudinal slot effectively compensates for manufacturing and / or assembly tolerances in the circumferential direction, both in the flange section and in the insert, and thus over at least a large portion of the compression limiter. The passage between the two partial longitudinal slots is particularly advantageous, as it allows for a more uniform distribution of force and mechanical stress along the entire longitudinal slot when the compression limiter is installed and therefore pressurized. This prevents certain areas from becoming uneven or evenly distributed.Areas of the compression limiter are subjected to significantly greater force than other areas, which has an overall gentle effect on the compression limiter according to the invention and consequently on the associated rotor and the electric motor. According to one embodiment, the longitudinal slot extends over the entire length of the flange section and the insert. This measure increases the uniformity of the force and mechanical stress distribution in the longitudinal direction of the compression limiter. Tolerance compensation is thereby further improved.

[0014] According to a further embodiment, the flange section is annular with a first inner edge and a first outer edge, wherein the longitudinal slot extends continuously over a first total length of the flange section from the first inner edge to the first outer edge. Such a radially continuous longitudinal slot in the area of ​​the flange section is particularly easy to implement and simultaneously enables maximum tolerance compensation around the circumference of the flange section. Alternatively or additionally, the insert is cylindrically annular with a second inner edge and a second outer edge, wherein the longitudinal slot extends continuously over a second total length of the insert from the second inner edge to the second outer edge. This measure also enables a simplified implementation of the radially continuous longitudinal slot while simultaneously maximizing tolerance compensation around the circumference of the insert.The ring shape of the flange section and the cylindrical ring shape of the insert allow for the definition of a longitudinally extending annular opening. This enables the secure insertion of a fastener such as a screw to fix the compression limiter to the winding carrier.

[0015] According to a further embodiment, the longitudinal slot is formed between two opposing cutting planes of the flange section and the insert, the cutting planes being either parallel or angled to each other. With the cutting planes parallel, a uniform width of the longitudinal slot is achieved in both the longitudinal and radial directions. With the cutting planes angled, the width of the longitudinal slot varies radially. Both a radially increasing and a radially decreasing width of the longitudinal slot are conceivable. According to a further embodiment, the compression limiter has several wing sections for centering and / or positioning the winding carrier in a direction of the flange section facing away from the insert, which are arranged spaced apart from each other in the circumferential direction. For example,Two wing sections can be provided, arranged opposite each other. The wing sections are preferably each positioned on an outer edge of the annular flange section. This measure simply creates a load-bearing and positioning device for the entire converter assembly into which the compression limiter is installed.

[0016] According to another embodiment, the wing sections are aligned perpendicular to the upper surface of the flange section. This gives the compression limiter a higher pressure resistance in the installed state, thus improving the stability of the converter assembly attached to the rotor.

[0017] According to a further embodiment, the wing sections each have an arc-shaped cross-section. This is, in particular, an arc-shaped rib with an arc-shaped outer edge and an inner arc-shaped rim. The arc shape can be, for example, a circular arc or an elliptical arc. This allows for a more uniform application of force around the circumference of the wing sections, which prevents or at least reduces deformation of the components. Alternatively or additionally, the wing sections have a smaller radial extent than the flange section. In this way, a weight reduction of the compression limiter can be achieved without impairing the centering and positioning functionalities or losing mechanical or structural stability, so that the compression limiter can be designed to be lightweight.

[0018] According to a further embodiment, the wing sections are symmetrical with respect to the longitudinal slot. A symmetrical design promotes a symmetrical and thus more uniform distribution of force and mechanical stress at the contact surfaces of the compression limiter with the other components, such as the winding carrier and the rectifier housing. Alternatively or additionally, the wing sections each have a radial outer surface that transitions flush into a radial outer surface of the flange section. This can be achieved, for example, by forming at least the flange section and the wing sections in one piece. It is also conceivable to form the wing sections, the flange section, and the insert part in one piece from a preferably metallic workpiece.

[0019] According to a further embodiment, the wing sections have a conical end face. In this embodiment, a lower edge of the conical end face facing the flange section is preferably arranged radially within an upper edge of the conical end face facing away from the flange section. This measure facilitates the positioning of the compression limiter and thus also of the entire transformer assembly during the manufacturing process of the associated rotor.

[0020] According to another embodiment, the compression limiter is provided as a separate component. In this case, the compression limiter is inserted into the guide opening of the winding carrier and secured there. To prevent unwanted rotation of the installed compression limiter relative to the other components of the converter assembly, an anti-rotation device can be provided on the compression limiter itself and / or on the winding carrier, which is preferably made of a plastic material. Alternatively, the compression limiter can be provided as an insert integrated into the winding carrier. Preferably, in this case, the winding carrier can be produced by overmolding the compression limiter, which is prefabricated as an insert, with an injection-molded material, such as a polymer.

[0021] Within the scope of the present invention, an electric machine, in particular an electric motor for an at least partially electrified vehicle, is further proposed, comprising a rotor according to any of the embodiments disclosed herein and a stator. The electric motor is, in particular, a separately excited or electrically excited synchronous motor (EESM), especially an inductively electrically excited synchronous motor (IEESM). The electric motor can function as the sole drive unit or alternatively as one of several drive units, for example, in the case of a hybrid electric vehicle (HEV) with a combination of an electric drive unit and an internal combustion engine. The electric motor can have a substantially cylindrical outer contour or a conical outer contour, e.g., for a brake motor.

[0022] Within the scope of the present invention, an at least partially electrified vehicle comprising the electric motor according to the invention is proposed. The at least partially electrified vehicle can be, for example, a purely electric vehicle (EV), such as a battery electric vehicle (BEV), or a hybrid electric vehicle (HEV).

[0023] The aspects mentioned above serve illustrative purposes and are not intended to limit the scope of the invention. Numerous variations of the aspects described above are possible. The various aspects discussed in this disclosure can be combined in any way to produce additional advantages. Furthermore, some of the features can form the basis for one or more divisional applications.

[0024] The invention is explained below with reference to examples using the embodiments shown in the figures. The figures show:

[0025] Fig. 1 shows a schematic representation of a vehicle comprising an electric axle drive;

[0026] Fig. 2 shows a schematic representation of a converter arrangement for providing a DC excitation current for a rotor of the electric axle drive, wherein the converter arrangement comprises a stationary primary side and a rotatable secondary side;

[0027] Fig. 3 shows a schematic representation of the rotor in an axial sectional view, to which the secondary side of the converter arrangement is fixedly attached; Fig. 4 shows a schematic representation of a compression limiter for attaching a winding carrier of a secondary winding to a rectifier housing of the converter arrangement in a perspective view, wherein a longitudinal slot of the compression limiter is additionally shown in an enlarged perspective view;

[0028] Fig. 5 shows a schematic representation of the compression limiter in a perspective view when inserted into a guide opening formed in the winding carrier of the secondary winding;

[0029] Fig. 6 shows a schematic representation of the compression limiter in a perspective view in a state fixed in the winding carrier of the secondary winding by means of screws.

[0030] The same objects, functional units, and comparable components are identified by the same reference numbers in the figures. These objects, functional units, and comparable components are identical with respect to their technical characteristics unless the description explicitly or implicitly discloses otherwise.

[0031] Fig. 1 shows a schematic representation of a vehicle 100 that is at least partially electrified. The vehicle 100 can be a purely electric vehicle or a hybrid vehicle. The vehicle 100 is equipped with an electric axle drive comprising an electric motor 102, a DC / AC inverter 106, and a gearbox 112. The electric motor 100 is designed here as a separately excited or electrically excited synchronous motor (FESM / EESM), in particular as an externally excited / electrically excited synchronous motor (IEESM). The electric motor 102 comprises a stator (not shown in detail here) with several phase strands arranged as stator windings and a rotor 118 (see, for example, Fig. 3) with one or more electrically conductive rotor coils 122 (see, for example, Fig. 3).The inverter 106 is connected between the drive battery 106 and the electric motor 102 for the purpose of converting a DC input voltage provided by a traction battery 104 into an AC output voltage. For this purpose, the inverter 106 has a plurality of power switches (not shown in detail here) that form a bridge circuit with several half-bridges and are controlled by control signals generated by a control unit 108. The control signals are preferably configured to switch the power switches of the inverter 106 according to pulse width modulation (PWM). In particular, by closing and opening the power switches, several phase currents, preferably sinusoidal in shape and phase-shifted from one another, are generated for the phase strands of the stator of the electric motor 102.The phase currents, each fed into one of the several phase strands of the stator, generate a rotating magnetic field inside the stator. The rotor 118, or the rotor coil 122, is supplied with a DC excitation current, resulting in a stationary magnetic field on the rotor 118. Based on the interaction between the rotating stator magnetic field and the stationary rotor magnetic field, a torque is generated, which is transmitted by means of the gearbox 112, preferably a reduced-ratio gearbox, to an axle 110, here exemplified as the rear axle of the vehicle 100, and finally to wheels 114, here exemplified as rear wheels.

[0032] To generate the DC excitation current, the rotor 118 uses a converter assembly 120, the circuit diagram of which is shown schematically and purely by way of example in Fig. 2. The converter assembly 120 is mounted axially laterally to the rotor 118. The converter assembly 120 is specifically designed as a rotary transformer. For this purpose, the converter assembly 120 comprises a voltage input 119, a primary side 124, and a secondary side 126. The voltage input 119 serves to connect a DC power supply, e.g., from the vehicle's electrical system. The primary side 124 has a first converter stage 121 designed as an inverter and a primary winding (here designated "Lp") coupled to the first converter stage 121. The secondary side 126 has a second converter stage 129 designed as a rectifier and a secondary winding 131 coupled to the second converter stage 129 (here referred to as “Ls”, see Fig. 3).The primary winding 123 and the secondary winding 127 are galvanically isolated from each other, with the galvanic isolation 125 indicated by a dashed line. As further illustrated in Fig. 2, the secondary winding 126 is rotationally connected to the rotor 118 with respect to the axis of rotation 115. Thus, the secondary winding 126 is able to rotate together with the rotor 118 during operation of the electric motor 100, so that it is a rotating / rotatable secondary winding 126. In contrast, the primary winding 124 is stationary with respect to the stator, so that it is a stationary primary winding 124. The converter arrangement 120 is preferably modular, so that such a rotary transformer module can be axially mounted as a separate component on the rotor 118.

[0033] The rotor 118, equipped with the rotary transformer, is shown schematically and purely by way of example in an axial sectional view in Fig. 3. Shown is the rotating secondary winding 126 with the secondary winding 131, which is mounted on a winding carrier 130 provided for this purpose, as well as the second converter stage, which acts as a rectifier and is not shown in detail here, and which is housed in a rectifier casing 132. The rotor coils 122 are mounted in a rotor core 116, which is non-rotatably mounted on the rotor shaft 117. An interface, not shown in detail here, is provided between the rotor 118 and the rotor coils 122 to supply the latter with the DC output voltage applied to the output side of the rectifier.

[0034] The winding carrier 130 is preferably made of a plastic material such as polymer. The rectifier housing 132, on the other hand, is preferably made of a metal, such as aluminum. The winding carrier 130 is fixed to the rectifier housing 132 to provide the rotating secondary side 126. However, to prevent over-tensioning the plastic material of the winding carrier 130, compression limiters 133 are used. For illustrative purposes only, two compression limiters 133 are shown schematically and by way of example in Fig. 3, without showing in detail the specific method of attaching or connecting the compression limiters 133 to or with the winding carrier 130 / the rectifier housing 132.

[0035] Fig. 4 shows an exemplary compression limiter 133 in a schematic perspective view. The compression limiter 133 has an insert 134, a flange section 135, and two wing sections 136, 137, which are formed in one piece from a single metallic workpiece. The insert 134 is cylindrical and serves to be inserted into a guide opening located on a top surface 148 of the winding carrier 130 (see, for example, Fig. 5). At the same time, the elongated shape of the insert 134 facilitates simplified positioning of the winding carrier 130 on the rectifier housing 132. The insert 134 extends downwards from a bottom surface 143 of the flange section 135 in the direction shown in Fig. 4.Both the insert 134 and the flange section 135 have an annular cross-section, providing an annular opening 146 that extends along the length of the flange section 135 and the insert 134 for receiving a fastening element, such as a screw. The flange section 135 is radially larger than the flange section 134. This allows for a larger contact area between the compression limiter 133 and the top surface 148 of the winding carrier 130, on which the compression limiter 133 rests when installed. The compressive forces acting on the contact surface when fixing the winding carrier 130 to the rectifier housing 132 are thus distributed over a larger area, preventing or at least reducing overstressing of the plastic material of the winding carrier 130.

[0036] A longitudinal slot 138 is formed in the insert part 134 and in the flange section 135 of the compression limiter 133. The longitudinal slot 138 extends continuously from the insert part 134 to the flange section 135. In particular, the longitudinal slot 138 extends over the entire length of the insert part 134 and the flange section 135, and thus continuously from a top surface 142 of the flange section 135 to a bottom surface of the insert part 134 facing away from the flange section 135. As shown in Fig. 4, the longitudinal slot 138 is preferably oriented vertically or perpendicular to the top surface 142 of the flange section 135. In Fig. 4, the longitudinal slot 138 is shown separately in an enlarged perspective view. As can be seen there, the longitudinal slot 138 comprises a first partial longitudinal slot 138A belonging to the flange section 135 and a second partial longitudinal slot 138B belonging to the insert part 134.Both partial longitudinal slots 138A, 138B have the same width D, which is measured as the distance between two axially extending and mutually parallel cutting planes 144, 145 of the compression limiter 133 and remains constant over the length of the longitudinal slot 138. Both partial longitudinal slots 138A, 138B are thus formed flush with one another. For illustrative purposes only, an imaginary dividing line 147 between the two partial longitudinal slots 138A, 138B is shown in Fig. 4.

[0037] The provision of such a longitudinal slot 138 makes it possible to effectively compensate for manufacturing and / or assembly tolerances in the circumferential direction both in the area of ​​the flange section 135 and in the area of ​​the insert part 134, and thus over at least a large portion of the compression limiter 133. The passage between the two partial longitudinal slots 138A, 138B is particularly advantageous, as it allows for a more uniform distribution of force and mechanical stress along the entire longitudinal slot 138 when the compression limiter 133 is installed and thus pressurized. This advantageously prevents some locations or areas of the compression limiter 133 from being subjected to significantly greater force than other locations / areas, which has an overall gentler effect on the compression limiter 133 according to the invention and consequently on the associated rotor 118 and the electric motor 102 as a whole.

[0038] The wing sections 136, 137 extend from the upper surface 142 of the flange section 135 in a direction away from the insertion part 134, upwards in the illustration in Fig. 4. The wing sections 136, 137 are symmetrical with respect to the longitudinal slot 138 and are arranged at two opposite ends of an outer edge of the flange section 135. Furthermore, the wing sections 136, 137 each have an arcuate cross-sectional profile such that a radial outer surface 140 of the respective wing section 136, 137 and a radial outer surface 141 of the flange section 1 are flush with each other. The wing sections 136, 137 also have a conical end face 139 with an upper edge and a lower edge, the upper edge having a larger radius than the lower edge. Furthermore, the radial extent of the respective wing sections 136, 137 is smaller than that of the flange section 135.This allows for an opening at the end face to accommodate a fastening element, such as a screw 149, 150. As shown in a schematic and purely exemplary perspective view in Fig. 6, two compression limiters 133 are each fixed to the top surface 148 of the winding carrier 130 by means of a screw 149, 150. A bolt section (not shown) of the screw 149, 150 is inserted into the annular opening 146, with a screw head (not shown) bearing against the top surface 142 of the flange section 135. The wing sections 136, 137 further provide a simple way to create a centner's weight and simultaneously a positioning device for the entire converter assembly 120, into which the compression limiter 133 is integrated. According to the invention, a multifunctional compression limiter 133 is therefore enabled, which simultaneously fulfills the technical advantages described above.

[0039] The compression limiter 133 can be a separate component. In this case, the compression limiter 133 is inserted into the guide opening of the winding carrier 130 and secured there. To prevent unwanted rotation of the installed compression limiter 133 relative to the other components of the converter assembly 120, an anti-rotation device can be provided on the compression limiter 133 itself and / or on the plastic material of the winding carrier 130. Alternatively, the compression limiter 133 can be an integrated insert part within the winding carrier 130. Preferably, in this case, the winding carrier 130 can be produced by overmolding the compression limiter 133, which is prefabricated as an insert part, with an injection-molded material, such as a polymer.

[0040] Reference symbol list for at least partially electrified vehicles

[0041] electric motor

[0042] drive battery

[0043] DC / AC inverter

[0044] Control unit

[0045] rear axle

[0046] transmission

[0047] rear wheels

[0048] axis of rotation

[0049] Rotor core

[0050] Rotor shaft

[0051] rotor

[0052] voltage input

[0053] Converter arrangement, first converter stage

[0054] Rotor magnets / rotor coils

[0055] Primary page

[0056] Potential separation

[0057] Secondary page

[0058] Transformer unit, second converter stage

[0059] Wrap carrier

[0060] Secondary winding

[0061] rectifier housing

[0062] Compression limiter

[0063] Insert part

[0064] Flange section, 137 wing sections

[0065] Longitudinal slot A first partial longitudinal protection B second partial longitudinal slot end face radial outer surface radial outer surface top bottom , 145 axial cut sides ring opening dividing line top , 150 screws

Claims

Patent claims 1. Compression limiter (133) for a converter arrangement (120) for providing a DC excitation current in a rotor (118), wherein the converter arrangement (120) comprises a transformer unit (128) with a primary winding and a secondary winding (131) and a rectifier downstream of the transformer unit (128), wherein the secondary winding (131) is mounted on a winding support (130), wherein the rectifier is received by a rectifier housing (132), wherein the compression limiter (133) for attaching the winding support (130) to the rectifier housing (132) comprises a flange section (135) and a plug-in part (134) extending from the flange section (135) in a longitudinal direction, wherein the compression limiter (133) has a longitudinal slot (138) extending continuously from the plug-in part (134) into the flange section (135).

2. Compression limiter (133) according to claim 1, wherein the longitudinal slot (138) extends over the total length of the flange section (135) and the plug-in part (134).

3. Compression limiter (133) according to claim 1 or 2, wherein the flange section (135) is annular with a first inner edge and a first outer edge, wherein the longitudinal slot (138) extends continuously over a first total length of the flange section (135) from the first inner edge to the first outer edge.

4. Compression limiter (133) according to one of the preceding claims, wherein the insertion part (134) is cylindrically ring-shaped with a second inner rim and a second outer rim, wherein the longitudinal slot (138) extends continuously over a second total length of the insertion part (134) from the second inner rim to the second outer rim.

5. Compression limiter (133) according to one of the preceding claims, wherein the longitudinal slot (138) is located between two opposing cutting planes (144, 145) of the flange section (135) and the insert part (134), wherein the cutting planes (144, 145) are parallel or angled to each other.

6. Compression limiter (133) according to one of the preceding claims, wherein the compression limiter (133) has several wing sections (136, 137) for centering and / or positioning the winding carrier (130) in a direction away from the insertion part (134) of the flange section (135), which are arranged spaced apart from each other in the circumferential direction.

7. Compression limiter (133) according to claim 6, wherein the wing sections (136, 137) are aligned perpendicular to a top surface (142) of the flange section (135).

8. Compression limiter (133) according to claim 6 or 7, wherein the wing sections (136, 137) each have an arc-shaped cross-section, and / or wherein the wing sections (136, 137) have a smaller radial extent than the flange section (135).

9. Compression limiter (133) according to one of claims 6 to 8, wherein the wing sections (136, 137) are symmetrical with respect to the longitudinal slot (138), and / or wherein the wing sections (136, 137) each have a radial outer surface (140) which merges flush into a radial outer surface (141) of the flange section (135).

10. Compression limiter (133) according to one of claims 6 to 9, wherein the wing sections (136, 137) have a conical end face (139).

11. Compression limiter (133) according to one of claims 6 to 10, wherein the compression limiter (133) is provided as a separate component or as an insert part integrated into the winding carrier (130), wherein the winding carrier (130) is preferably formed by overmolding the insert part with an injection molding material.

12. Converter arrangement (120) for providing a DC excitation current in a Rotor (118) comprising a transformer unit (128) with a primary winding and a secondary winding (131) and a rectifier connected downstream of the transformer unit (128), wherein the secondary winding (131) is mounted on a winding support (130), wherein the rectifier is supported by a rectifier housing (132) is included, wherein the converter arrangement (120) further comprises a compression limiter (133) according to one of claims 1 to 11.

13. Rotor (118) for an electric machine (102), in particular an inductively excited synchronous motor, comprising a converter arrangement (120) according to claim 12.

14. Electric motor (102), in particular an inductively excited synchronous motor, for an at least partially electrified vehicle (100), comprising the rotor (118) according to claim 13.

15. At least partially electrified vehicle (100) comprising an electric motor (102) according to claim 14.

Images