Separate excited machine with slip ring module, method for producing separate excited machine, and motor vehicle

Abstract

The invention relates to a separately excited machine (FEM) for a traction drive (TA) of an at least partially electrically driven motor vehicle (KFZ), comprising a rotor shaft (RW) of a rotor (RO), to which a shaft end portion (WEA) adjoins, the shaft end portion (WEA) having a first opening (EO) and a second opening (ZO), the second opening is arranged at a distance from the first opening (EO) in the axial direction of the rotor (RO); a potting body (VK) which is arranged in the shaft end portion (WEA) and in which an electrically conductive connection element (VE) is embedded at least partially, the connection element (VE) having a first distal end (DEE) and a second distal end (DZE) and the second distal end (DZE) being guided through the second opening (ZO); a slip ring module (SRM) which is arranged on a distal end portion (DE) of the shaft end portion (WEA) and which has a slip ring (SR) and a connection portion (VA) which is arranged on the slip ring (SR) and which is electrically conductively connected to the distal first end (DEE) of the connection element (VE); and a bearing device (LE) mounted on an outer facing surface (AM) of the shaft end portion (WEA).

Description

Technical Field

[0001] This invention relates to a separately excited motor for a traction drive in a motor vehicle that is at least partially electrically driven, wherein the motor has a rotor shaft with an end portion. A slip ring module is mounted on the end portion, and the slip rings of the slip ring module are electrically connected to a connecting element extending through the end portion. A bearing assembly is arranged on the outer surface of the end portion. Another object of the invention is a method for manufacturing a separately excited motor according to the invention. Another object of the invention is a motor vehicle with a separately excited motor according to the invention. Background Technology

[0002] Separately excited motors are generally known in the prior art. Known separately excited motors typically have a slip ring module on the shaft end portion, mounted on the outer side or outer surface of the shaft end portion. Grooves extending axially along the rotor are formed in the outer surface to receive the connecting elements of the slip ring module. It is also known that a bearing assembly is located on the shaft end portion. Due to the grooves in the outer surface in the bearing assembly area, comprehensive sealing measures are required between the bearing assembly and the outer surface to prevent the cooling medium used to cool the rotor windings from reaching the slip rings of the slip ring module. These sealing measures can increase the cost of the motor. Summary of the Invention

[0003] The object of the present invention is to provide a separately excited motor that is inexpensive to manufacture and has higher sealing performance in the area of ​​the bearing assembly relative to the rotor shaft.

[0004] This objective is achieved through the subject matter of the independent claims. Another preferred improvement of the invention is the subject matter of the dependent claims, the following description, and the accompanying drawings. In this context, unless otherwise expressly stated in the specification, each feature can represent an aspect of the invention individually and in combination.

[0005] In a first aspect, the present invention relates to a separately excited motor for a traction drive of a motor vehicle that is at least partially electrically driven, the separately excited motor comprising: a rotor shaft of a rotor, an end portion of which is adjacent to or formed on the rotor shaft, wherein the end portion has a first opening and a second opening, the second opening being arranged at a distance from the first opening in the axial direction of the rotor; a potting body arranged in the end portion of the shaft, and wherein a conductive connecting element is at least partially embedded in the potting body, wherein the connecting element has a distal first end and a distal second end, and the distal second end can be guided through or is guided through the second opening; a slip ring module arranged on the distal end portion of the end portion of the shaft, and the slip ring module having a slip ring and a connecting portion arranged on the slip ring and conductively connected to the distal first end of the connecting element; and a bearing assembly mounted on an outer surface of the end portion of the shaft, and the rotor can be mounted in a housing via the bearing assembly.

[0006] In other words, according to a first aspect of the invention, a separately excited motor is provided for a traction drive of a motor vehicle that is at least partially electrically driven. The separately excited motor has a rotor including a rotor shaft. A shaft end portion is arranged and / or formed adjacent to the rotor shaft. The shaft end portion includes a first opening and a second opening, the second opening being arranged at a distance from the first opening along the axial direction of the rotor. The first opening is preferably coaxially aligned with the longitudinal axis of the rotor and / or the rotor shaft. The first opening is particularly preferably designed as a closed-edge opening. The second opening is formed in the wall of the shaft end portion; if the shaft end portion is viewed alone, the second opening is preferably formed as a recess and / or groove on a side opposite to the first opening, and the formation of the closed-edge opening is only possible when combined and / or connected with the rotor shaft. A potting compound is arranged in the shaft end portion. A conductive connecting element is at least partially embedded in the potting compound. The connecting element has a distal first end and a distal second end. The distal second end can be guided through the second opening or preferably guided through the second opening. In this way, the winding wires of the rotor windings of the rotor can be easily and electrically connected to the second end of the connecting element. A slip ring module is arranged on the distal end portion of the shaft end portion. This slip ring module has a slip ring and a connecting portion arranged on the slip ring. The connecting portion is electrically connected to the distal first end of a connecting element. Furthermore, a bearing assembly is provided, which is seated on the outer surface of the shaft end portion, preferably between the slip ring module and the second opening. Because the connecting element is guided through the shaft end portion and a conductive connection is formed between the slip ring and the distal second end of the connecting element, which can be connected to the rotor winding, is formed, grooves or recesses are preferably not required on the outer surface of the shaft end portion in the bearing assembly region. This allows for a simple and inexpensive increase in the medium sealing of this region. This prevents the cooling medium used to cool the laminated core arranged on the rotor shaft from reaching the slip ring module in the bearing assembly region.

[0007] In a preferred embodiment of the invention, a shaft seal ring is arranged adjacent to the bearing assembly. Therefore, it is conceivable that the shaft seal ring is arranged on the side of the bearing assembly facing the slip ring module and / or on the side of the bearing assembly facing away from the slip ring module. If the bearing assembly is designed to be self-lubricating, i.e., in other words, has a lubricant, particularly grease, the shaft seal ring is preferably arranged on the side facing away from the slip ring module. This prevents fluid, particularly the cooling medium used to cool the laminated core arranged on the rotor shaft, from seeping into the bearing assembly and reaching the slip ring module via the bearing assembly. It is also conceivable that the shaft seal ring is arranged on the side facing the slip ring module. This arrangement is preferred if the bearing assembly is to be lubricated using a coolant used to cool the laminated core arranged on the rotor shaft.

[0008] Another advantageous improvement of the invention is that the outer surface is designed to be continuous in the region where the shaft seal ring sits on and / or abuts the shaft end portion for sealing. In other words, no grooves or recesses are formed in the region where the shaft seal ring sits on the outer surface—extending beyond the width of the shaft seal ring in the axial direction of the rotor—relative to the axial direction of the rotor or shaft end portion. This means that the media sealing performance in the region of the shaft seal can be increased in a simple and inexpensive manner, and therefore also the media sealing performance of the bearing assembly.

[0009] Furthermore, due to the fact that the connecting element is guided through the shaft end portion, the diameter of the shaft end portion in the bearing assembly and shaft seal ring area can be represented by a reduced outer diameter. Because of this reduced outer diameter, the circumferential speed in the shaft seal ring area decreases as the rotor rotates about its longitudinal axis, thereby reducing wear on the shaft seal ring and potentially increasing its service life.

[0010] Another advantageous improvement of the invention is that the potting compound is fixed in the shaft end portion along the longitudinal direction of the rotor by means of material bonding and / or form fit. The form fit fixation causes the potting compound to be designed such that, on the one hand, the internal geometry of the shaft end portion, and on the other hand, the rotor shaft, the potting compound is held in the shaft end portion along the longitudinal direction of the rotor.

[0011] It is conceivable that the potting compound has a portion in which the maximum outer diameter or outer cross-section is greater than the minimum inner diameter of the shaft end portion. This allows the potting compound to be fixed in place along the direction of the slip ring module.

[0012] The potting compound is preferably formed of an electrically insulating material. Particularly preferably, the potting compound may be formed of or comprise plastic material. Such potting compounds are inexpensive to produce.

[0013] In an advantageous embodiment of the invention, a sealing element is arranged between the inner surface of the shaft end portion and the potting compound. The sealing element is preferably designed as an annular seal, particularly as an O-ring. The sealing element is particularly preferably formed of a permanently elastic material. The sealing element serves to prevent fluid used for cooling the laminated core arranged on the rotor shaft from reaching the slip ring module via the second opening and the annular gap between the potting compound and the inner surface of the shaft end portion.

[0014] It is conceivable that the distal first end is not guided through the first opening, but rather designed to spring back toward the first opening. This then requires the connecting portion of the slip ring module to protrude through the first opening into the shaft end portion in order to electrically connect to the distal first end of the connecting element. This could be advantageous relative to the axial mounting space of the rotor or separately excited motor.

[0015] Alternatively, according to a preferred improvement of the invention, the distal first end is guided through the first opening. In other words, the distal first end protrudes beyond the first opening. Therefore, the connecting portion of the slip ring module does not need to protrude into the first opening of the shaft end portion to be electrically connected to the distal first end of the connecting element. In this way, the conductive connection between the connecting portion of the slip ring and the distal first end of the connecting element is not impaired or significantly impaired by the shaft end portion, thus enabling a simple and inexpensive conductive connection.

[0016] According to an advantageous embodiment of the invention, the connecting portion has a receiving opening for receiving a distal first end of the connecting element. In other words, the distal first end is preferably formed in a straight line and extends along the axial and / or longitudinal direction of the rotor. The receiving opening of the connecting portion is designed as an opening and / or ring with a closed edge, into which the linearly formed distal first end of the connecting element engages when the slip ring module is mounted on the shaft end portion. Therefore, the connecting portion and the distal first end of the connecting element can be connected together in a simple and inexpensive manner, thereby electrically connecting to each other.

[0017] The receiving opening can be integrally formed in the connecting element. However, it is also conceivable that a pole shoe with a receiving opening is mounted on the connecting portion, and the distal first end engages in the receiving opening of the pole shoe.

[0018] As an alternative to the receiving opening in the connecting portion, the distal first ends of the connecting portion and the connecting element may extend at least partially parallel to each other in the region of conductive connection, and the regions where the connecting element and the connecting portion extend parallel to each other are preferably connected to each other by a material bonding manner. The regions extending parallel to each other preferably extend along the longitudinal direction of the shaft end portion.

[0019] The conductive connection between the connecting portion and the distal first end of the connecting element is a material bonding connection, a force-fit connection, and / or a form-fit connection. A material bonding connection is preferably a welded connection or a conductive adhesive connection. A form-fit and / or force-fit connection can be a press-fit connection.

[0020] In an advantageous embodiment of the invention, the slip ring module is configured to have a slip ring carrier, wherein the slip ring and the connecting portion are arranged at least partially and / or at least partially within the slip ring carrier. This facilitates the preparation of the slip ring module so that it can be subsequently mounted on the shaft end portion of the rotor shaft. This means that the production time of separately excited motors can be shortened and therefore production costs can be reduced, since only the slip ring module is mounted on the shaft end portion and electrically connected to the connecting element.

[0021] Advantageously, the slip ring module is mounted on the shaft end portion, and the slip rings of the slip ring module are arranged radially at a distance from the outer surface of the shaft end portion. This means that the axial installation space of the separately excited motor can be reduced.

[0022] In a second aspect, the present invention relates to a method for producing a separately excited motor according to the invention, the method comprising the following steps: - Provide shaft end portions, - The potting compound with connecting elements is arranged in the shaft end portion. - Connect the end portion of the shaft to the rotor shaft. - The rotor shaft is supported in the housing via a bearing assembly. - Arrange the slip ring module on the far end portion of the shaft end portion.

[0023] In other words, according to a second aspect of the invention, a method for producing a rotor according to the invention is provided. The method includes at least the step of providing a shaft end portion. A potting compound is arranged in the shaft end portion, and connecting elements are arranged in the potting compound. In this way, the connecting elements are guided within the shaft end portion. After the potting compound has been arranged in the shaft end portion, the shaft end portion is connected to a rotor shaft. The rotor shaft may be formed as a hollow shaft, but is not limited thereto. It is also conceivable that the rotor shaft has a solid cross-section. The rotor shaft is supported in a housing via bearing arrangements. The bearings may be designed as rolling bearings. The housing may be a housing wall or an end cover of a separately excited motor housing. Furthermore, a slip ring module is particularly arranged, especially mounted on the distal end portion of the shaft end portion. The slip ring module is preferably mounted along the axial direction of the rotor or rotor shaft. Depending on the outer diameter of the slip ring module, after the rotor has been arranged and / or mounted, the slip ring module may be arranged on the distal end portion of the shaft end portion via bearing arrangements in the housing. Alternatively, the slip ring module can be mounted on the distal end portion of the shaft end portion, and the entire rotor and the slip ring module mounted on the shaft end portion can then be mounted in the housing via a bearing assembly. In this way, a method is provided that allows for the simple and inexpensive arrangement of the rotor within the housing, and improved media sealing can be achieved in the area of ​​the housing or bearing housing.

[0024] Advantageously, a shaft sealing ring is arranged adjacent to the bearing assembly and / or at a distance from the bearing assembly, the sealing ring sealing against the housing on one side and against the shaft end portion on the other side.

[0025] According to another preferred improvement of the invention, in order to arrange the potting body with connecting elements in the shaft end portion, separate potting bodies with connecting elements are produced outside the hollow shaft, and the separate potting bodies are securely arranged in the shaft end portion. In this way, the potting body can preferably be easily inserted into the shaft end portion in the case of the constructed rotor or the constructed rotor shaft, and is preferably arranged in the shaft end portion by means of material bonding and / or form fit connections.

[0026] Regarding the form-fit connection of the potting compound in the shaft end portion, the potting compound is preferably inserted into the shaft end portion via a side opposite to the first opening of the shaft end portion, guided by the linear movement of the distal first end of the connecting element. In this case, if the shaft end portion is considered as such, the second opening is preferably formed as a recess and / or groove on the wall of the shaft end portion. Therefore, by inserting the potting compound into the shaft end portion, the distal second end of the connecting element can be guided through the second opening in a simple manner.

[0027] After the potting compound has been inserted into the shaft end portion, the rotor shaft and the shaft end portion are connected to each other. This connection is preferably a material bonding connection. A material bonding connection is preferably a welded connection.

[0028] The potting compound is preferably designed such that its entirety cannot be guided through the shaft end portion beyond the first opening. In other words, the potting compound has at least a portion of an outer cross-section larger than the minimum inner cross-section. In other words, the potting compound has an external geometry that allows it to be inserted into the shaft end portion only via the side opposite to the first opening. This means that the potting compound can be fixed in a fixed position within the rotor, at least in the axial direction of the slip ring module.

[0029] In the direction of the rotor shaft, the potting compound is preferably fixed and / or positioned axially by the rotor shaft. It is conceivable that the rotor shaft is designed as a solid body. The rotor shaft itself then serves as a stop for the potting compound. However, it is also conceivable that the rotor shaft is designed as a hollow shaft. In this case, the outer cross-section and / or outer diameter of the potting compound adjacent to the rotor shaft is set to be larger than the inner diameter of the hollow shaft aligned and / or formed adjacent to the potting compound.

[0030] Alternatively, it is conceivable that, in order to arrange the potting compound with connecting elements in the shaft end portion, the connecting elements are first arranged in the shaft end portion, and then the potting compound is introduced into and hardened in the shaft end portion. In other words, the potting compound is formed in place. For this purpose, the connecting elements are pre-inserted into the shaft end portion, and then the potting compound is poured into the interior of the shaft end portion. This allows the potting compound to be tightly bonded to the medium inside the shaft end portion, preventing fluid from being transported through the shaft end portion.

[0031] In a third aspect, the present invention relates to a motor vehicle having a separately excited motor according to the invention.

[0032] The motor vehicle is preferably at least partially electric, and more preferably fully electric.

[0033] The separately excited motor is preferably an integral component of the traction drive of a motor vehicle.

[0034] It should be noted that all the above and following features described with respect to one aspect of the invention are equally applicable to any other aspect of the invention. In particular, all the features of a separately excited motor are equally applicable to the method for producing a separately excited motor and the motor vehicle.

[0035] Other features and advantages of the invention will become apparent from the dependent claims and the following exemplary embodiments. The exemplary embodiments should not be construed as limiting, but rather as examples. The exemplary embodiments should enable those skilled in the art to practice the invention. The applicant reserves the right to incorporate one and / or more features disclosed in the exemplary embodiments as the subject of the claims, or to incorporate such features into the existing claims. The exemplary embodiments are described in more detail based on the accompanying drawings. Attached Figure Description

[0036] In the attached diagram: Figure 1 A longitudinal section is shown in the first embodiment, passing through the region at the shaft end portion of the rotor of the separately excited motor; Figure 2 A longitudinal section is shown in the second embodiment, passing through the region at the shaft end portion of the rotor of the separately excited motor; Figure 3 An exploded view of the shaft end portion is shown in longitudinal section; Figure 4 A motor vehicle with a separately excited motor is shown. Detailed Implementation

[0037] Figure 1 A longitudinal section is shown passing through the region of the WEA portion at the shaft end of the rotor RO of the separately excited motor FEM. The separately excited motor FEM is constructed and / or designed for use in the traction drive TA of a motor vehicle KFZ that is at least partially electrically driven.

[0038] A separately excited motor (FEM) has a rotor RO, which includes a rotor shaft RW. A laminated core BP with at least one salient pole (not shown) is arranged in a non-rotatable manner on the outer peripheral surface AUF of the rotor shaft RW. A rotor winding RW is typically wound around the salient pole.

[0039] The shaft end portion WEA is arranged and / or formed adjacent to the rotor shaft RW. The shaft end portion WEA includes a first opening EO and a second opening ZO, the second opening being arranged at a distance from the first opening EO along the axial direction of the rotor RO. A potting compound VK is arranged in the shaft end portion WEA. A conductive connecting element VE is at least partially embedded in the potting compound VK. The connecting element VE has a distal first end DEE and a distal second end DZE. In this exemplary embodiment, the distal second end DZE is guided through the second opening ZO of the shaft end portion WEA. Therefore, the winding wires of the rotor winding RW can be conductively connected to the distal second end DZE.

[0040] A slip ring module SRM is arranged on the distal end portion DE of the shaft end portion WEA. The slip ring module has a slip ring SR and a connecting portion VA arranged on the slip ring SR. The connecting portion VA is electrically connected to the distal first end DEE of the connecting element VE.

[0041] In addition, a bearing assembly LE is provided, which is seated on the outer surface AM of the shaft end portion WEA, preferably located between the slip ring module SRM and the second opening ZO. The bearing assembly LE is arranged in the housing GE of the separately excited motor FEM. The housing GE in the area of ​​the bearing assembly LE can be constructed and / or designed as an end cover, intermediate wall, or outer wall.

[0042] Because the connecting element VE is guided through the shaft end portion WEA and a conductive connection is established between the slip ring SR and the distal second end DZE of the connecting element VE, which can be connected to the rotor winding RW, no groove or recess is needed on the outer surface AM of the shaft end portion WEA in the bearing assembly LE region. This allows for a simple and inexpensive improvement of the media sealing in this region. The improved media sealing prevents the liquid cooling medium used to cool the rotor RO, particularly the rotor winding RW, and / or the laminated core BP, from reaching the slip ring module SRM.

[0043] In addition, a shaft seal ring (WDR) is provided, which is arranged adjacent to the bearing assembly LE and provides a seal between the housing GR and the outer facing surface AM. In this example, the shaft seal ring (WDR) is located on the side of the bearing assembly LE facing away from the slip ring module SRM. This prevents the cooling medium used to cool the laminated core BP or rotor windings from reaching the slip ring module SRM through the bearing assembly.

[0044] Preferably, the outer surface AM is designed to be continuous in the region where the shaft seal ring sits on the shaft end portion WEA. This improves the media sealing performance in the region where the bearing assembly LE rests on the shaft end portion WEA.

[0045] Furthermore, due to the fact that the connecting element VE is guided through the shaft end portion WEA, the diameter of the shaft end portion WEA in the area of ​​the bearing assembly LE and the shaft seal ring WDR may exhibit a reduced outer diameter. Because of this reduced outer diameter, the circumferential speed in the area of ​​the shaft seal ring WDR decreases as the rotor RO rotates about its longitudinal axis, thereby reducing wear on the shaft seal ring WDR and potentially increasing its service life.

[0046] The second opening ZO is arranged in the shaft end portion WEA or formed between the bearing assembly LE and the laminated core BP. This means that the connecting element VE only needs to be guided through the shaft end portion WEA, without having to pass through the entire rotor shaft RW. This, in turn, means that the connecting element VE can have a reduced length, thereby reducing material costs.

[0047] The distal first end DEE is guided through the first opening EO. In other words, the distal first end DEE protrudes beyond the first opening EO. Therefore, the connecting portion VA of the slip ring module SRM does not need to protrude into the first opening EO in the shaft end portion WEA in order to electrically connect to the distal first end DEE of the connecting element VE. In this way, the conductive connection between the connecting portion VA of the slip ring SRM and the distal first end DEE of the connecting element VE is not impaired by the shaft end portion WEA or is not significantly impaired by the shaft end portion, thus achieving a conductive connection in a simple and inexpensive manner.

[0048] The connecting portion VA has a receiving opening ANO for receiving the distal first end DEE of the connecting element VE. In other words, the distal first end DEE is formed in a straight line and extends along the axial and / or longitudinal direction of the rotor RO. The receiving opening ANO of the connecting portion VA is designed as an opening and / or ring with a closed edge, into which the distal first end DEE of the connecting element VE, formed in a straight line, engages when the slip ring module SRM is mounted on the shaft end portion WEA. Therefore, the connecting portion VA and the distal first end DEE of the connecting element VE can be joined together in a simple and inexpensive manner to electrically connect with each other.

[0049] The conductive connection between the connecting portion VA and the distal first end DEE of the connecting element VE is a material bonding connection, a force-fit connection, and / or a form-fit connection. A material bonding connection is preferably a welded connection or a conductive adhesive connection. A form-fit and / or force-fit connection can be a press-fit connection.

[0050] The slip ring module SRM has a slip ring carrier SRT, wherein the slip ring SR and the connecting portion VA are arranged at least partially and / or partially within the slip ring carrier SRT. This facilitates the preparation of the slip ring module SRM so that it can be subsequently mounted on the shaft end portion WEA of the rotor shaft RW. This means that the production time of the separately excited motor FEM can be shortened and therefore the production cost can be reduced, since only the slip ring module SRM is mounted on the shaft end portion WEA and electrically connected to the connecting element VE.

[0051] Figure 2 A longitudinal section of the WEA passing through the shaft end portion of the separately excited motor FEM in the second embodiment is shown, and Figure 3 An exploded view of the WEA portion at the shaft end is shown in longitudinal section. See also the following... Figure 2 and Figure 3 .

[0052] The potting compound VK is inserted into the shaft end portion WEA via a first opening EO opposite to the shaft end portion WEA, guided by the linear movement of the distal first end DEE of the connecting element VE. If the shaft end portion WEA is considered as such, the second opening ZO is formed as a recess and / or groove on the wall WA of the shaft end portion WEA. Therefore, by inserting the potting compound VK into the shaft end portion WEA, the distal second end DZE of the connecting element VE can be easily guided through the second opening ZO.

[0053] After the potting compound VK is inserted into the shaft end portion WEA, the rotor shaft RW and the shaft end portion WEA are connected to each other. This connection is preferably a material bonding connection. A material bonding connection is preferably a welded connection.

[0054] The potting compound VK is designed such that its entirety cannot be guided through the shaft end portion WEA beyond the first opening EO. In other words, the potting compound VK has at least a partial outer cross-section larger than the minimum inner cross-section. In other words, the potting compound VK has an external geometry that allows it to be inserted into the shaft end portion only via the side opposite to the first opening EO. In this way, the potting compound VK can be fixed and / or positioned in a fixed position within the rotor RO, at least in the axial direction of the slip ring module SRM.

[0055] In the direction of the rotor shaft RW, the potting compound VK is fixed and / or positioned axially by the rotor shaft RW. It is conceivable that the rotor shaft RW is designed as a solid body, as shown in this exemplary embodiment. The rotor shaft RW itself then serves as a stop for the potting compound VK. However, it is also conceivable that the rotor shaft RW is designed as a hollow shaft. In this case, the outer cross-section and / or outer diameter of the potting compound VK adjacent to the rotor shaft RW is set to be larger than the inner diameter of the hollow shaft aligned in a manner adjacent to the potting compound.

[0056] Furthermore, it can be seen that a sealing element DE is arranged between the inner lateral surface IM of the shaft end portion WEA and the potting body VK. The sealing element DE is preferably designed as an annular seal, specifically an O-ring. In this way, fluid used for cooling the stacked core BP arranged on the rotor shaft RW can be prevented from reaching the slip ring module SRM through the second opening ZO and the annular gap between the potting body VK and the inner lateral surface IM of the shaft end portion WEA.

[0057] Figure 4 The diagram shows a motor vehicle KFZ employing a traction drive TA, in which a separately excited motor FEM is arranged.

Claims

1. A separately excited motor (FEM) for a traction drive (TA) of a motor vehicle (KFZ) that is at least partially electrically driven, said separately excited motor having: The rotor shaft (RW) of the rotor (RO) has a shaft end portion (WEA) adjacent to the rotor shaft, wherein, The shaft end portion (WEA) has a first opening (EO) and a second opening (ZO), the second opening being arranged at a distance from the first opening (EO) along the axial direction of the rotor (RO). A potting body (VK) is disposed in the shaft end portion (WEA), and a conductive connecting element (VE) is at least partially embedded in the potting body, wherein the connecting element (VE) has a distal first end (DEE) and a distal second end (DZE), and the distal second end (DZE) can be guided through the second opening (ZO). A slip ring module (SRM) is disposed on the distal end portion (DE) of the shaft end portion (WEA), and the slip ring module has a slip ring (SR) and a connecting portion (VA), the connecting portion being disposed on the slip ring (SR) and electrically connected to the distal first end (DEE) of the connecting element (VE), and A bearing assembly (LE) is mounted on the outer surface (AM) of the shaft end portion (WEA).

2. The separately excited motor according to any one of the preceding claims, characterized in that, A shaft seal ring (WDR) is arranged adjacent to the bearing assembly (LE).

3. The separately excited motor according to claim 2, characterized in that, The outer surface (AM) is designed to be continuous in the region where the shaft seal ring (WDR) sits on the shaft end portion (WEA).

4. The separately excited motor according to any one of the preceding claims, characterized in that, The potting compound (VK) is fixed in the shaft end portion (WEA) along the longitudinal direction of the rotor (RO) in a form-fit manner.

5. The separately excited motor according to any one of the preceding claims, characterized in that, The potting compound (VK) has a portion in which the maximum outer diameter or external cross-section is greater than the minimum inner diameter of the shaft end portion (WEA).

6. The separately excited motor according to any one of the preceding claims, characterized in that, A sealing element (DE) is arranged between the inner lateral surface (IM) of the shaft end portion (WEA) and the potting body (VK).

7. The separately excited motor according to any one of the preceding claims, characterized in that, The distal first end (DEE) of the connecting element (VE) is guided through the first opening (EO).

8. The separately excited motor according to any one of the preceding claims, characterized in that, The connecting portion (VA) has a receiving opening (ANO) for receiving the distal first end (DEE) of the connecting element (VE).

9. The separately excited motor according to any one of the preceding claims, characterized in that, The slip ring module (SRM) has a slip ring carrier (SRT), wherein the slip ring (SR) and the connecting portion (VA) are arranged at least partially and / or at least partially in the slip ring carrier (SRT).

10. The separately excited motor according to any one of the preceding claims, characterized in that, The slip ring module (SRM) is mounted on the shaft end portion (WEA), and the slip ring (SR) of the slip ring module (SRM) is arranged radially at a distance from the outer surface (AM) of the shaft end portion (WEA).

11. A method for producing a separately excited motor (FEM) according to any one of the preceding claims, the method comprising the steps of: - Provide shaft end portions, - The potting compound (VK) with connecting elements (VE) is arranged in the shaft end portion (WEA). - Connect the end portion of the shaft to the rotor shaft. - The rotor shaft (RW) is supported in the housing (GE) via a bearing assembly (LE). - Arrange the slip ring module (SRM) on the distal end portion (DE) of the shaft end portion (WEA).

12. The method according to claim 11, characterized in that, In order to arrange the potting body (VK) having the connecting element (VE) in the shaft end portion (WEA), a separate potting body (VK) having the connecting element (VE) is produced outside the rotor shaft (RW), and the separate potting body is securely arranged in the shaft end portion (WEA).

13. The method according to claim 11, characterized in that, In order to arrange the potting compound (VK) having the connecting element (VE) in the shaft end portion (WEA), the connecting element (VE) is first arranged in the shaft end portion (WEA), and then the potting compound (VK) is introduced into the shaft end portion (WEA) and hardened in the shaft end portion.

14. The method according to any one of claims 11 to 13, characterized in that, After the potting compound has been placed in the shaft end portion, the shaft end portion is connected to the rotor shaft.

15. A motor vehicle (KFZ) having a separately excited motor (FEM) according to any one of claims 1 to 10.

Images