Rotor assembly

Abstract

The invention relates to a rotor assembly (1), in particular for an externally excited synchronous machine, comprising: a rotor body (2) formed in an axial direction with a plurality of slots (3) for receiving windings (4); rotor magnetic poles (5) each formed in the radial direction between two of the slots (3); windings (4) which extend in the slots (3) and surround the rotor poles (5); groove closing elements (6) which close the grooves (3) in the radial direction; at least one separating body (7) arranged in one of the slots (3) in the circumferential direction between two of the windings (4); wherein the separating body (7) comprises at least one continuous cooling channel (8), which extends in an axial direction and through which a cooling medium can flow, and wherein the separating body (7) protrudes axially from the groove (3) at least with a first end face end (16) and at least one first heat-conducting element (18) is arranged at the axially protruding end (16), the heat conducting element extends in at least a first circumferential direction between two adjacent grooves (3).

Description

Technical Field

[0001] The present invention relates to a rotor assembly, in particular a rotor assembly for an externally excited synchronous motor, the rotor assembly comprising: a rotor body, which is formed with a plurality of slots in the axial direction for accommodating windings; and rotor poles, each of which is formed in the radial direction between two slots in the slots; a winding, which extends in the slot and surrounds the rotor poles, a slot closing element, which closes the slot in the radial direction; and at least one separating body, which is circumferentially arranged in one of the slots between two windings in the winding, wherein the separating body comprises at least one continuous cooling channel extending in the axial direction, through which a cooling medium can flow. Background Art

[0002] Electric motors are increasingly being used to power motor vehicles, creating an alternative to fossil fuel-burning internal combustion engines. Significant efforts have been made to improve the suitability of electric drives for everyday use while also providing users with the driving comfort they are accustomed to.

[0003] In the development of electric machines, particularly those intended for use in electric axles or hybrid modules, there is a constant need to increase their power density and efficiency while simultaneously reducing manufacturing costs. Within this context, it is also known to design electric machines as externally excited synchronous machines (EESMs). These are a special type of synchronous machine in which the magnetic field in the rotor is generated not by permanent magnets but by energized coils. These coils are also commonly referred to as field coils or excitation coils. To energize the coils in the rotating rotor, power must be supplied via a suitable transformer arrangement.

[0004] Due to the manufacturing process, gaps may appear between any two field windings on the rotor. In particular, support bodies or separator bodies are inserted into these gaps, which completely or largely fill them. Particularly for high-speed applications, the separator bodies protect the windings of the field coils in the centrifugal field from unintentional movement. EP 1 494 335 B1 discloses corresponding separator bodies between adjacent field coils.

[0005] In particular, with a view to increasing power density and efficiency, it is necessary to cool the rotor and dissipate the thermal energy during operation, particularly in the case of externally excited synchronous machines. For example, air-cooled rotors or fluid-cooled hollow shafts are known from the prior art. DE 10 2018 220 810 A1 discloses a fluid-cooled rotor for electric machines and externally excited synchronous machines, in which the rotor windings are cooled directly or approximately as a result of heat losses. EP 3 618 241 A1 discloses a fluid-cooled hollow shaft with conical walls.

[0006] The object of the present invention is now to provide a suitable device for dissipating thermal energy from a rotor for an externally excited synchronous machine, which device has a compact construction and a high degree of operational reliability. Summary of the Invention

[0007] This object is achieved by a rotor assembly, in particular a rotor assembly for an externally excited synchronous motor, the rotor assembly comprising: a rotor body, which is formed with a plurality of slots in the axial direction for accommodating windings; rotor poles, each of which is formed between two slots in the slots in the radial direction; a winding, which extends in the slots and surrounds the rotor poles; a slot closing element, which closes the slot in the radial direction; at least one separator body, which is arranged in a circumferential direction in one of the slots between two windings in the winding, wherein the separator body comprises at least one continuous cooling channel extending in the axial direction, through which a cooling medium can flow, and the separator body protrudes axially from the slot at least with a first end face end, and at least one first heat conduction element is arranged on the axially protruding end, and the at least one first heat conduction element extends between two adjacent slots in at least the first circumferential direction.

[0008] The advantageous effect of this is that, thanks to the cooling channels in the separator body and the heat-conducting element, power losses in the form of heat can be dissipated as close to their source as possible. Furthermore, the incorporation of the cooling channels in the separator body and in combination with the heat-conducting element results in only minimal intervention in the electromagnetic design of the rotor, compared to cooling between slots in the rotor body itself.

[0009] This achieves improvements in high-speed stability, thermal behavior, efficiency and available torque density compared to existing technologies.

[0010] The separator body thus essentially serves two functions. On the one hand, it helps secure the windings in the slots even under centrifugal forces, and on the other hand, it facilitates fluid-based cooling within the slots via cooling channels. Thus, the rotor windings are supported and cooled simultaneously via the separator body at high speeds and in a stable manner. Furthermore, the heat-conducting element is thermally connected to the fluid-cooled separator body, allowing it to be cooled accordingly by the fluid cooling of the separator body.

[0011] The thermally separating body may be in direct contact with the winding and / or thermally coupled to the winding via the interposition of a heat conducting medium.

[0012] The separator body is preferably made of a non-ferromagnetic material so that the electromagnetic function of the rotor or motor is not impaired. The separator body is preferably made, at least in part, of a material with good thermal conductivity to achieve a good thermal connection between the rotor windings and the cooling medium. The separator body can then be manufactured, for example, by aluminum extrusion, plastic extrusion, or plastic injection molding. This allows for the creation of a hollow interior but closed exterior shape that can transport the cooling medium and is leak-proof even under high pressure.

[0013] According to one embodiment, the cooling channel has a constant cross section in the axial direction. Furthermore, the cooling channel has a substantially constant radial distance from the axis of rotation in the axial direction.

[0014] An advantageous effect of this embodiment is that the design of the cooling channel prevents a pumping effect caused by the cooling channel that is dependent on the rotational speed and direction of rotation, since the inlet and outlet of the cooling channel in the partition body are equidistantly spaced from the rotational axis.

[0015] According to one embodiment, a rotor assembly includes a rotor shaft designed as a hollow shaft and having radial openings for guiding a cooling medium. The openings are connected to cooling channels for guiding the cooling medium. Advantageously, the openings are connected to the cooling channels via another component, which together with the openings and the cooling channels forms a channel system. Thus, the cooling channels are connected to the cooling system via the channel system. It is particularly advantageous if the cooling channels are connected to the cooling system on both sides via additional components, thereby forming a closed cooling circuit.

[0016] According to one embodiment, a cavity is formed in the slot and is bounded by one of the windings and the separator body, wherein the cavity contains potting material. An advantageous effect of this embodiment is that the potting material in the cavity improves the thermal connection between the winding and the separator body. The cavity is a result of manufacturing tolerances in the winding and the separator body.

[0017] According to one embodiment, the cooling medium is a cooling liquid. This embodiment has the advantageous effect that the cooling liquid has a higher heat capacity and thermal conductivity than a gas and thus enables better heat dissipation or power loss dissipation. In particular, the cooling liquid comprises oil and / or water.

[0018] According to one embodiment, the rotor body is designed as a laminated stack. This embodiment has the advantageous effect of minimizing eddy current losses in the rotor body.

[0019] According to another preferred further refinement of the present invention, the separator body may further include a plurality of cooling channels spaced apart from one another in the radial and / or circumferential directions. This embodiment advantageously provides improved heat dissipation and dissipation of power losses. Another advantage is that the plurality of spaced-apart cooling channels ensures more uniform heat dissipation and dissipation of power losses.

[0020] Furthermore, according to an equally advantageous embodiment of the invention, at least two of the cooling channels can have a substantially geometrically identical cross-sectional profile. Such a cross-sectional shape has proven to be particularly advantageous in terms of the necessary dimensional stability of the partition body under centrifugal forces and providing high heat transfer performance.

[0021] According to another particularly preferred embodiment of the present invention, at least two of the cooling channels can have a rectangular basic contour, with the longitudinal sides of the cooling channels aligned in radial extension. This has also proven to be particularly advantageous with regard to optimizing the dimensional stability and heat transfer properties of the partition body. In principle, however, the cooling channels can also have contours deviating from a rectangular shape, for example, a trapezoidal shape.

[0022] The outer cross-sectional profile of the separator body can also have a profile that deviates from a rectangular shape. Preferably, the cross-sectional profile of the separator body is shaped so as to minimize the distance between the winding and the separator body. For example, it is conceivable that the separator body has a trapezoidal cross-section at its radially outer end, with the short side of the cross-section adjoining the rectangular cross-section radially inward. This allows for further optimization of the heat transfer from the winding to the separator body, as the potting compound that typically fills the cavity between the winding and the separator body generally has a lower thermal conductivity than the separator body.

[0023] Furthermore, the present invention can be further developed so that at least two cooling channels are separated from each other by a connecting element extending tangentially through the separating body in cross section. Within the separating body, such a connecting element can contribute to maintaining dimensional stability under the influence of high external centrifugal forces. In particular, the separating body can absorb centrifugal forces from surrounding components without deforming to a critical extent.

[0024] In an equally preferred embodiment of the present invention, the separator body can also be formed from aluminum. The separator body is preferably produced from aluminum by extrusion. Aluminum's material properties enable good mechanical properties and good thermal conductivity within the separator body. Since aluminum is non-ferromagnetic, the electromagnetic function of the machine is not affected. Alternatively, the separator body can be produced from plastic by extrusion, but lower thermal conductivity is generally acceptable in this case.

[0025] It may also be advantageous to further develop the invention so that the separator body has an electrically insulating coating on at least part of its outer lateral surface. The separator body can thus be electrically insulated from live parts, in particular to avoid electrical contact between the field coils or between the field coils and the vehicle, and thus meet high-voltage safety requirements. The coating can be achieved, for example, by painting, overmolding, or an adhesive bonding layer. For example, for electrical insulation with limited requirements, the aluminum separator body can also be anodized. For more demanding requirements, the aluminum separator body can be overmolded with plastic, coated with an alternative material, or covered with a film on the contact surface of the rotor coil. This ensures that no electrical short circuits occur between the field coils or between the field coils and the vehicle.

[0026] According to another preferred embodiment of the subject matter of the present invention, the separating body can protrude axially from the slot closure element with at least one end face. This allows for a simplified connection of the separating body to the fluid cooling circuit. Furthermore, the separating body can preferably be finely machined at its ends, for example, deburred, and a smooth sealing surface can be produced at the ends by removing material, for example by milling, grinding, or polishing the inner or outer contour. In the case of plastic overmolding, the sealing surface can also be made of plastic. A seal can be bonded or injection-molded onto the sealing surface, so that the joint between the separating body and the adjacent component for introducing and discharging the cooling medium can be sealed even under high pressure of the cooling medium.

[0027] The separating body is preferably connected to a slot-closing element, which radially closes the slot and supports the supporting body in a stable manner at high speed. The slot-closing element is preferably made of a non-ferromagnetic and non-conductive material, such as plastic, so that the electromagnetic behavior of the machine is not affected and no additional eddy current losses occur in the component. The slot-closing element can be manufactured by plastic injection molding or extrusion and attached to the separating body by form-fitting or adhesive bonding. Alternatively, the slot-closing element can be injection molded directly onto the separating body. The slot-closing element can be integrally connected by plastic overmolding of the separating body.

[0028] Finally, the invention can also advantageously be realized in such a way that the groove-closing element and the separating body are connected in one piece.

[0029] An advantageous effect of this design is that the integral connection allows the slot-closing element and the separating body to be manufactured as a single component. This reduces the complexity of the rotor assembly. Another advantage is that the integral connection provides a more stable component. Particularly preferably, the slot-closing element and the separating body are integrally designed, for example, from aluminum or plastic.

[0030] According to an advantageous embodiment of the present invention, at least one second heat-conducting element is arranged at the axially protruding end, and the at least one second heat-conducting element extends between two adjacent slots in the second circumferential direction. This further improves the cooling effect. In particular, symmetrical cooling can be achieved on both sides of the slot. Furthermore, imbalances in the rotor can be reduced.

[0031] According to another preferred embodiment of the present invention, the first heat-conducting element and / or the second heat-conducting element can also be plate-shaped, which has proven to be particularly advantageous with regard to the cooling effect and the weight introduced by the heat-conducting element. Plate-shaped heat-conducting elements can provide a high heat dissipation effect in the winding head region of the rotor at a relatively low weight.

[0032] Furthermore, according to a likewise advantageous embodiment of the invention, the first heat-conducting element and / or the second heat-conducting element can be shaped like a circular ring segment, which has proven to be particularly advantageous with regard to reducing imbalances in the rotor.

[0033] According to another particularly preferred embodiment of the invention, the first heat conducting element and / or the second heat conducting element can extend over 75% to 100% of the height of the slot. This allows for sufficiently good heat dissipation in particular in the region of the winding heads of the rotor.

[0034] Furthermore, the invention can be further developed in such a way that the first heat-conducting element and the second heat-conducting element are shaped substantially identically, which is particularly advantageous in terms of production on the one hand and simplifies the modeling of the heat transfer on the other hand.

[0035] In an equally preferred embodiment of the invention, the first and / or second heat-conducting elements can each also have an electrically insulating coating at least partially on their sides facing the windings. This ensures that no electrical short circuits occur between the field coils or between the field coils and the vehicle. The coating can also be designed as an electrically insulating film applied to the conducting elements.

[0036] The first heat-conducting element and / or the second heat-conducting element may be integrally connected to each other, resulting in increased structural strength and reduced manufacturing costs due to a smaller number of components.

[0037] It may also be advantageous to further develop the invention such that the first and / or second heat conducting element is connected integrally and / or form-fittingly and / or frictionally to the axially protruding end of the separating body. This allows the conducting elements to be fixed accordingly relative to the separating body.

[0038] For example, it is conceivable to connect the first heat-conducting element and / or the second heat-conducting element to the separating body in a form-fitting manner, for example by means of a snap-fit ​​connection. This has the advantage, in particular, that the first heat-conducting element and / or the second heat-conducting element can then be optionally inserted before or after the separating body is inserted into the slot, which can provide greater flexibility in simplifying the installation process.

[0039] It is also possible to integrally fix the first heat-conducting element and / or the second heat-conducting element to the separator body, for example by means of an adhesive connection.

[0040] Furthermore, the first heat conducting element and / or the second heat conducting element can also be arranged frictionally on the separating body, for example by means of a press fit.

[0041] According to a preferred embodiment of the present invention, the first heat-conducting element and / or the second heat-conducting element can also be formed integrally, preferably monolithically, with the separator body. The advantage of this embodiment is that it provides particularly good heat transfer and a particularly advantageous shape of the conduction element in terms of manufacturing. Casting and injection molding processes are particularly suitable for this purpose. In one embodiment, the first heat-conducting element and / or the second heat-conducting element can be held in a tool together with the separator body and fixed to each other during the injection molding process, so that the first heat-conducting element and / or the second heat-conducting element and the separator body are thermally connected to each other. In addition, the connection geometry for introducing and discharging the cooling medium can also preferably be incorporated by the injection molding process. The separator body and the conduction element do not necessarily have to be electrically insulated from each other. Preferably, the two components are connected so that they are thermally and / or mechanically and / or electrically connected to each other. The combination of separator body and conduction element thus formed can then preferably be overmolded and / or coated and / or covered with a film for electrical insulation.

[0042] The first heat-conducting element and the second heat-conducting element are preferably made of non-ferromagnetic material so that the electromagnetic function of the rotor or the motor is not impaired. The first heat-conducting element and the second heat-conducting element are preferably at least partially made of a material with good thermal conductivity so as to achieve a good thermal connection between the rotor winding and the cooling medium.

[0043] According to another preferred embodiment of the subject matter of the present invention, the first and / or second heat-conducting elements are formed from aluminum and / or plastic. The material properties of aluminum allow for good mechanical properties and good thermal conductivity within the first and / or second heat-conducting elements. Since aluminum is non-ferromagnetic, the electromagnetic function of the machine is not affected. Alternatively, the first and / or second heat-conducting elements can be made from plastic, however, this generally means accepting lower thermal conductivity.

[0044] The first heat-conducting element and / or the second heat-conducting element may each also have at least one cooling channel, which extends at least partially in the circumferential direction and through which a cooling medium can flow, and which may be fluidically coupled to the cooling channel of the separating body. This allows the cooling performance of the conduction elements to be further optimized.

[0045] Finally, the present invention can also advantageously be designed such that a first set of separating bodies protrudes axially from one of the slots with a first end face end, a first heat conducting element is arranged on this axially protruding first end, the first heat conducting element extending between two adjacent slots in at least one first circumferential direction, and at least one second heat conducting element is arranged on this axially protruding first end, the second heat conducting element extending between two adjacent slots in a second circumferential direction, and a second set of separating bodies protrudes axially from one of the slots with a second end face end, the first heat conducting element is arranged on this axially protruding second end, the first heat conducting element extending between two adjacent slots in at least one first circumferential direction, and at least one second heat conducting element is arranged on this axially protruding second end, the second heat conducting element extending between two adjacent slots in a second circumferential direction, and the separating bodies of the first set of separating bodies and the separating bodies of the second set of separating bodies are arranged alternately in circumferentially adjacent slots. The resulting advantages are, in particular, that the combination of separating bodies and conducting elements achieves complete circumferential heat dissipation in the winding head region of the rotor, and thus particularly good heat dissipation. Due to the high degree of consistency of this design, the rotor can also be manufactured particularly cost-effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The invention is explained in more detail below with reference to the accompanying drawings without limiting the general concept of the invention.

[0047] In the attached figure:

[0048] Figure 1 A detailed representation of the rotor having a first separated body is shown in cross-section;

[0049] Figure 2 A perspective view of the exposed separator body and windings is shown. DETAILED DESCRIPTION

[0050] Figure 1 A rotor assembly 1 for an externally excited synchronous motor is shown, comprising a rotor body 2 having a plurality of slots 3 formed in the axial direction for receiving windings 4, and rotor poles 5 each formed in the radial direction between two of the slots 3. The rotor assembly 1 also has windings 4 extending in the slots 3 and surrounding the rotor poles 5.

[0051] The groove 3 is closed in the radial direction by a groove-closing element 6 .

[0052] A separating body 7 is arranged in each of the slots 3 in the circumferential direction between two of the windings 4. The separating body 7 has two parallel, continuous cooling channels 8, each extending in the axial direction and through which a cooling medium can flow.

[0053] Figure 1 The slots 3 are particularly clearly shown, extending through the rotor body 2 in the axial direction. Current-carrying windings 4 are arranged in the slots 3, each of the windings surrounding a rotor pole 5 formed between two slots 3. The slots 3 are closed radially outward by slot-closing elements 6, which are arranged in the circumferential direction between two adjacent rotor poles 5. The rotor poles 5 each form a stop in the radial direction, which faces one of the slots 3 in the circumferential direction. Each two of the stops facing the slots 3 thus form a form-fitting receptacle for the slot-closing element 6. The form-fitting receptacle thus formed secures the slot-closing element 6 against centrifugal forces during operation. In the inward radial direction, a separating body 7 is arranged in the slot 3 adjacent to the slot-closing element 6, so that the separating body is oriented essentially in the radial direction in the center between two adjacent windings 4.

[0054] The separator body 7 has two side surfaces that are aligned circumferentially with the winding 4 and are parallel to each other and to an imaginary plane oriented in the radial direction. The separator body 7 is connected to the slot-closing element 6. In the illustrated embodiment, the connection is a form-fit connection, but alternatively, a friction connection or an integral connection, or a combination thereof, is also possible. Cooling channels 8 are formed in the axial direction in the separator body 7. The cooling channels are circular in cross section and are arranged equidistantly from the side surfaces in the circumferential direction and equidistantly from the radial direction. This ensures uniform heat dissipation.

[0055] Cooling channels 8 extend over the entire axial length of the separator body 7, and during operation, a cooling liquid flows through the cooling channels. The cooling channels are aligned parallel to the axis of rotation (not shown) of the rotor body 2. In the circumferential direction, a cavity 9 is formed in the slots 3 between each of the windings 4 and the separator body 7, and is filled with a potting compound 10. The potting compound 10 allows for an improved thermal connection between the windings 4 and the separator body 7.

[0056] In the exemplary embodiment shown, the separating body 7 is formed from aluminum and, on its outer lateral surface, at least partially has an electrically insulating coating 15. The slot-closing element 6 and the separating body 7 are connected in one piece.

[0057] As from Figure 2As can be seen in FIG, the separating body 7 protrudes axially from the slot-closing element 6 at least with its end-face end 16. The separating body 7 can be finished at its end-face end 16 to produce a smooth and particularly dimensionally precise sealing surface 17, in particular by removing material, for example by milling, grinding, or polishing the inner or outer contour. In the case of plastic overmolding, the sealing surface 17 can also be made of plastic. A seal can also be bonded or injection-molded onto the sealing surface 17, so that the joint between the separating body 7 and adjacent components for introducing and discharging the cooling medium can be sealed even under high pressure of the cooling medium.

[0058] Thus, the winding 4 is thermally well connected to the fluid-cooled separating body 7 in its axially extending region. In contrast, the winding 4 in the region of the winding head, i.e., in the region of the circumferential extension of the winding 4, is initially thermally poorly connected. Consequently, during operation, higher temperatures may occur in this region than in the axially extending region of the winding, and the rotor excitation power must be limited accordingly, which has a negative impact on the efficiency and power density of the machine.

[0059] As already explained, the separator body 7 projects axially from the slots 3 with a first end face end 16. A first heat-conducting element 18 is arranged at this axially projecting end 16, extending in a first circumferential direction (counterclockwise) between two adjacent slots 3. Furthermore, a second heat-conducting element 19 is arranged at this axially projecting end 16, extending in a second circumferential direction (clockwise) between two adjacent slots 3. Thus, each heat-conducting element 18, 19 is attached to the separator body 7 and positioned close to the winding heads, improving the thermal connection between the winding heads and the separator body 7. This reduces the maximum temperature in the winding 4 or, alternatively, increases the rotor excitation power, which can improve the efficiency and power density of the machine. The conducting elements 18, 19 of the separator body 7 are attached near the axial ends 16, 26 of the separator body 7. This ensures that, despite the circumferential projection, the separator body 7 can still be axially connected between two rotor coils in each slot 3. Furthermore, tolerances in the winding head height, in particular caused by tolerances in the coil wire thickness, can be compensated by the axial positioning of the separating body 7 in each case in the slot 3 between two rotor coils.

[0060] In the illustrated embodiment, the first and second heat-conducting elements 18, 19 are substantially identical plate-shaped and each have a circular ring segment profile. The first and second heat-conducting elements 18, 19 extend for 75% to 100% of the slot height 20 of the slot 3. The first and second heat-conducting elements 18, 19 can be arranged integrally, form-fittingly, and / or frictionally with the axially protruding end 16 of the separator body 7. The first and second heat-conducting elements 18, 19 each have an electrically insulating coating 21 at least partially on their sides facing the winding 4.

[0061] at last, Figure 2 As also shown, the first set of separating bodies 7a protrudes axially from one of the slots 3 at a first end face end 16. A first heat-conducting element 18a is arranged at the axially protruding first end 16, extending between two adjacent slots 3 in at least a first circumferential direction. At least one second heat-conducting element 19a is arranged at the axially protruding first end 16, extending between two adjacent slots 3 in a second circumferential direction. The second set of separating bodies 7b protrudes axially from one of the slots 3 at a second end face end 26. The first heat-conducting element 18b is arranged at the axially protruding second end 26, extending between two adjacent slots 3 in at least the first circumferential direction. Furthermore, a second heat-conducting element 19b is arranged at the axially protruding second end 26, extending between two adjacent slots 3 in a second circumferential direction.

[0062] Separator bodies 7a of the first group 7a and 7b of the second group 7b are arranged alternately in circumferentially adjacent slots 3. This allows circumferential cooling of all winding heads of a winding 4 using only one separator body 7 with corresponding conducting elements 18, 19.

[0063] The present invention is not limited to the embodiments shown in the accompanying drawings. Therefore, the above description should not be regarded as restrictive, but rather as illustrative. The appended claims should be understood to mean that the recited features are present in at least one embodiment of the present invention. This does not exclude the presence of other features. Where the claims and the above description define a “first” feature and a “second” feature, such designation is used to distinguish between two features of the same type and does not define an order of precedence.

[0064] Reference Signs List

[0065] 1 Rotor assembly

[0066] 2 Rotor body

[0067] 3 slots

[0068] 4 Windings

[0069] 5 rotor poles

[0070] 6-slot closure element

[0071] 7 Separate the body

[0072] 8 cooling channels

[0073] 9 cavities

[0074] 10 Potting compound

[0075] 15 coating

[0076] 16 end

[0077] 17 Sealing surface

[0078] 18 Conducting elements

[0079] 19 Conducting elements

[0080] 20 slot height

[0081] 21 coating

[0082] 26 end

Claims

1. A rotor assembly (1), in particular a rotor assembly for an externally excited synchronous motor, comprising: - a rotor body (2) formed with a plurality of slots (3) in the axial direction for receiving the windings (4), - rotor poles (5), each of which is formed in the radial direction between two of the slots (3), - windings (4) extending in the slots (3) and surrounding the rotor poles (5), a slot-closing element (6) which closes the slot (3) in the radial direction, at least one separating body (7) arranged in one of the slots (3) in the circumferential direction between two of the windings (4), - wherein the separating body (7) comprises at least one continuous cooling channel (8), which extends in the axial direction and through which a cooling medium can flow, It is characterized by: The partition body (7) protrudes from the slot (3) in the axial direction at least with a first end face end (16), and at least one first heat conducting element (18) is arranged on the axially protruding end (16), and the first heat conducting element extends between two adjacent slots (3) in at least a first circumferential direction.

2. The rotor assembly (1) according to claim 1, It is characterized by: At least one second heat-conducting element (19) is arranged on the axially protruding end (16), and the second heat-conducting element extends along a second circumferential direction between two adjacent grooves (3).

3. A rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat conducting element (18) and / or the second heat conducting element (19) are designed to be plate-shaped.

4. A rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat-conducting element (18) and / or the second heat-conducting element (19) are shaped like a circular ring segment.

5. Rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat conducting element (18) and / or the second heat conducting element (19) extend over 75% to 100% of the groove height (20) of the groove (3).

6. Rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat-conducting element (18) and the second heat-conducting element (19) are shaped to be substantially the same.

7. A rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat-conducting element (18) and / or the second heat-conducting element (19) each have an electrically insulating coating (21) at least partially on the side of the first heat-conducting element and / or the second heat-conducting element facing the winding (4).

8. Rotor assembly (1) according to any one of the preceding claims, It is characterized by: The first heat-conducting element (18) and / or the second heat-conducting element (19) are connected integrally and / or form-fittingly and / or frictionally to the axially protruding end (16) of the separating body (7).

9. Rotor assembly (1) according to any one of the preceding claims, It is characterized in that The first heat-conducting element (18) and / or the second heat-conducting element (19) are formed from aluminum and / or plastic.

10. Rotor assembly (1) according to any one of the preceding claims, It is characterized in that The first group of separating bodies (7a) protrudes axially from one of the slots (3) with a first end face end (16), and a first heat conducting element (18a) is arranged at the axially protruding first end (16), and the first heat conducting element extends along at least a first circumferential direction between two adjacent slots (3), and at least one second heat conducting element (19a) is arranged at the axially protruding first end (16), and the second heat conducting element extends along a second circumferential direction between two adjacent slots (3), and The second group of partition bodies (7b) protrudes axially from one of the slots (3) with a second end face end (26), and a first heat conducting element (18b) is arranged at the axially protruding second end (26), and the first heat conducting element extends along at least a first circumferential direction between two adjacent slots (3), and at least one second heat conducting element (19b) is arranged at the axially protruding second end (26), and the second heat conducting element extends along a second circumferential direction between two adjacent slots (3), The separating bodies (7a) of the first group of separating bodies (7a) and the separating bodies (7b) of the second group of separating bodies (7b) are alternately arranged in adjacent grooves (3) along the circumferential direction.

Images