Rotor and electric machine having such a rotor

Abstract

The invention relates to a rotor (1) for an electric machine (25), having a rotor support (2) which is rotatably supported about a rotation axis (Rot), wherein the rotor support (2) has a cylindrical inner cylinder (3) which is directed towards the rotation axis (Rot) and an opposite cylindrical outer cylinder (4), a magnetic flux-carrying rotor component which is carried by the cylindrical outer cylinder (4), wherein the magnetic flux-carrying rotor component has a first end side (6) and a second end side (7) respectively on the axial end sides, a rotationally symmetrical shaft section (8) which extends in the axial direction (A), and wherein the rotationally symmetrical shaft section (8) is arranged in an inner space (9) of the rotor support (2) and is supported coaxially with the rotor support (2). Furthermore, the invention also relates to an electric machine.

Description

Technical Field

[0001] This invention relates to a rotor for an electric machine, the rotor comprising: a rotor support rotatably supported about a rotation axis, wherein the rotation axis forms an axial direction and a radial direction extending about the axial direction, wherein the rotor support has a cylindrical inner cylinder pointing toward the rotation axis and an opposing cylindrical outer cylinder; a magnetic flux-carrying rotor component, the cylindrical outer cylinder carrying the magnetic flux-carrying rotor component, wherein the magnetic flux-carrying rotor component has a first end side and a second end side at its axial ends; and a rotationally symmetrical shaft section extending along the axial direction, wherein the rotationally symmetrical shaft section is arranged within the internal space of the rotor support and is coaxially supported with the rotor support.

[0002] The outer cylinder has a first radial tooth in the circumferential direction, at least in the region of the first end side. The first radial tooth has a first tooth pointing towards the rotor component carrying the magnetic flux and a first tooth root between every two first teeth.

[0003] Furthermore, the outer cylinder has a second radial tooth in the circumferential direction, at least in the region on the second end side, the second radial tooth having a second tooth pointing towards the rotor component carrying the magnetic flux and a second tooth root between every two second teeth. In addition, the invention also relates to an electric motor. Background Technology

[0004] An electric motor (which has a stator and a rotor rotatably supported around a rotor shaft) heats up during energy conversion from electrical energy to mechanical energy and vice versa. Cooling the electric motor is necessary to improve its efficiency.

[0005] These rotors have laminations, so-called lamination assemblies, which generate magnetic flux. These rotors typically operate in conjunction with the stator. Due to the electromagnetic activity during operation, the rotor and surrounding components heat up significantly. Several possibilities for cooling the rotor of electric machines are known in order to limit temperature rise and improve effective power.

[0006] It is known that the rotor support of such electric machines is constructed as a hollow shaft through which the cooling medium can flow in and out.

[0007] DE 10 2014 107 845 A1 discloses a hollow rotor shaft for an electric motor, the hollow rotor shaft having a cylindrical tube surrounding a shaft cavity closed on both sides by end flanges, wherein journals are respectively constructed on the end flanges, and wherein an inlet is provided on one of the journals, through which cooling liquid reaches the shaft cavity and the inner surface of the cylindrical tube, the hollow rotor shaft having a distribution element arranged in the shaft cavity, the distribution element receiving the cooling liquid entering through the inlet, guiding the cooling liquid toward the inner surface of the cylindrical tube by a rotationally symmetrical outlet surface, and discharging the cooling liquid onto the inner surface by an outlet region.

[0008] DE 10 2012 203 697 A1 discloses a rotor for cooling an electric machine, the electric machine comprising: a stator; a rotor rotatably supported about a rotation axis, the rotor magnetically interacting with the stator during operation of the electric machine; a shaft on which the rotor is fixed, and the shaft having an axial bore; and an inflow element extending into the axial bore, thereby allowing coolant, particularly a cooling liquid, to flow from the inflow element into the axial bore. Summary of the Invention

[0009] The object of this invention is to improve the cooling of the rotor of an electric machine without requiring additional structural space. Furthermore, another object is to provide an electric machine having such a rotor.

[0010] This objective is achieved by a rotor for an electric machine having a rotor support rotatably supported about a rotation axis, wherein the rotation axis forms an axial direction and a radial direction extending about the axial direction, wherein the rotor support has a cylindrical inner cylinder pointing towards the rotation axis and an opposing cylindrical outer cylinder.

[0011] A rotor component carrying magnetic flux is supported by a cylindrical outer cylinder. The rotor component carrying magnetic flux has a first end side and a second end side at its axial end.

[0012] A rotationally symmetric shaft segment, wherein the rotationally symmetric shaft segment extends along the axial direction, and wherein the rotationally symmetric shaft segment is arranged within the internal space of the rotor support, and the rotationally symmetric shaft segment is coaxially supported with the rotor support.

[0013] The outer cylinder has a first radial tooth in the circumferential direction, at least in the region on the first end side. The first radial tooth has a first tooth pointing towards the rotor component carrying magnetic flux and a first tooth root between every two first teeth.

[0014] The outer cylinder has a second radial tooth in the circumferential direction, at least in the region on the second end side. The second radial tooth has a second tooth pointing towards the rotor component carrying the magnetic flux and a second tooth root between every two second teeth.

[0015] in

[0016] The rotationally symmetric shaft section is configured for fluid guidance to the inner cylinder of the rotor support, and

[0017] The first radial output openings are disposed in the rotor support in the region of the first end side. These first radial output openings are respectively arranged in the first tooth root and are designed as radial notches in the rotor support. These notches are uniformly arranged along the circumferential direction of the rotor support, so that fluid is discharged radially through these first radial output openings when the rotor rotates.

[0018] Furthermore, the second radial output openings are disposed in the rotor support in the region of the second end side. These second radial output openings are respectively arranged in the second tooth root and are designed as radial notches in the rotor support. These notches are evenly arranged along the circumferential direction of the rotor support, so that the fluid is discharged radially through these second radial output openings when the rotor rotates.

[0019] With the rotor according to the invention, fluid, preferably oil, can pass radially through the rotor support via a first radial output opening and a second radial output opening. By arranging the radial output openings in the tooth root (tooth root bottom), no material loss occurs because the rotor support is thin-walled in this region.

[0020] Therefore, no stress or other problems are generated during rotation. When the radial output openings are arranged in the tooth roots on the first and second end sides, the fluid first flows through the inner cylinder to completely or almost completely cool the rotor. There, efficient cooling is achieved over a large axial area of ​​the rotor by the flowing fluid.

[0021] This allows for higher rotor power without structural changes, which could potentially lead to structural changes in surrounding components.

[0022] Another advantage is that the weight of the rotor remains unchanged while improving cooling efficiency.

[0023] Preferably, the inner cylinder is provided with three first radial outlet openings and three second radial outlet openings, which are evenly distributed along the circumferential direction. This allows the amount of cooling fluid flowing through to be safely and purposefully discharged from the internal space.

[0024] The rotor component carrying magnetic flux is preferably designed as a laminated assembly.

[0025] The fluid / cooling fluid is preferably oil or pressurized oil.

[0026] In another design, the rotationally symmetric shaft section has a plurality of flanges extending axially toward the inner cylinder of the rotor support, wherein the plurality of flanges are evenly arranged in the circumferential direction, and wherein the plurality of flanges extending axially have axial flange channels for guiding fluid.

[0027] Preferably, the axial flange channel is configured as a hole in the flange.

[0028] Here, these flanges are configured such that they do not contact or only slightly contact the inner cylinder. Furthermore, preferably, three flanges are evenly distributed on the outer periphery of the rotationally symmetric axial section.

[0029] Furthermore, the rotationally symmetric shaft section may have a fluid inlet and a rotationally symmetric fluid guide channel for guiding the fluid, as well as an outlet that forms a fluid connection with the flange channel, so that during rotation, the fluid flows through the rotationally symmetric fluid guide channel to the outlet and then flows into and through the flange channel.

[0030] Thus, fluid can be guided into the internal space of the rotor. Oil or fluid is held in the fluid guide channel by centrifugal force, thereby delivering the fluid to the outlet without structural changes. Preferably, the outlet is arranged on the fluid guide channel.

[0031] In another design, the flange and flange channel extend axially to the axial center of the inner cylinder, so that the fluid flowing out through the flange channel during rotation flows toward the center of the inner cylinder and is distributed substantially uniformly from the center to the first radial output opening and the second radial output opening.

[0032] Here, the axial center refers to the central region of the inner cylinder. By extending the flange channel to the center, fluid flows into the internal space of the rotor support at the outlet through centrifugal force, until it reaches the inner cylinder of the rotor support. From there, the fluid is distributed across the inner cylinder by centrifugal force until it reaches the first and second radial outlet openings. Effective cooling is achieved through the collision of the fluid flow at the center and the uniform distribution of the fluid flow across the inner cylinder. Such a uniform distribution can be achieved by constructing the fluid guide as a flange and integrating flange channels therein (where the flange is arranged only slightly or not at all on or in contact with the inner cylinder).

[0033] In another design, the rotor support has a bearing shoulder on the first end side, which is configured as a radial segment on the rotor support. Furthermore, the rotor support preferably has a safety ring on the second end side, which is arranged as a radial segment on the rotor support, thereby fixing the rotor component carrying magnetic flux between the bearing shoulder and the safety ring.

[0034] In another design, the bearing shoulder has a first void pointing toward the rotor component carrying magnetic flux, wherein the first void extends continuously through the bearing shoulder in the radial direction, so that fluid from the first radial output opening flows out radially through the first void during rotation.

[0035] In addition, the first empty portion can be constructed as a semi-circular groove.

[0036] Therefore, it is not necessary to drill holes in the rotor components carrying magnetic flux (most often laminations) to allow fluid to flow out radially. In addition, the laminations are also cooled here.

[0037] Therefore, only the most necessary axial structural space is used. Preferably, the empty space and the corresponding radial output opening are aligned in a straight line.

[0038] Furthermore, preferably, the safety ring has a second void that points toward the rotor component carrying the magnetic flux, wherein the second void extends continuously through the safety ring in the radial direction, so that during rotation, fluid from the second radial output opening flows out radially through the second void.

[0039] In addition, the second empty section can be constructed as a semi-circular groove.

[0040] Therefore, it is not necessary to drill holes in the rotor components carrying magnetic flux (which are mostly designed as laminations) to allow the fluid to flow out radially. In addition, the laminations are also cooled.

[0041] Therefore, only the most necessary axial structural space is used. Preferably, the empty space and the corresponding radial output opening are aligned in a straight line.

[0042] Preferably, a first fluid guide disk is arranged on the first end side of the rotor component carrying magnetic flux, the first fluid guide disk following the bearing shoulder in the radial direction, so that the fluid flowing through during rotation flows along the first fluid guide disk through the empty portion in the bearing shoulder, and wherein a second fluid guide disk is arranged on the second end side of the rotor component carrying magnetic flux, the second fluid guide disk following the safety ring in the radial direction, so that the fluid flowing through during rotation flows along the second fluid guide disk through the empty portion in the bearing shoulder.

[0043] Here, the fluid guide plate can be implemented as an oil plate. With the help of the fluid guide plate, fluid can be easily and specifically transferred in the radial direction by centrifugal force when the rotor rotates.

[0044] Furthermore, preferably, the first fluid guide disk is made of a non-conductive material or has a non-conductive coating, and / or the second fluid guide disk is made of a non-conductive material or has a non-conductive coating. Thus, such disks do not interact with or act on the rotor component carrying magnetic flux.

[0045] In another design, the first fluid guide disk has a first annular section on the radial end side that is away from the rotor component carrying the magnetic flux.

[0046] The second fluid guide disk may also have a second annular section on the radial end side, pointing away from the rotor component carrying the magnetic flux. Fluid can flow out through this axial protrusion to the winding head of the stator. Wetting of the winding head is thus achieved over the largest possible diameter, yet at a corresponding distance from the surrounding insulating components.

[0047] Furthermore, this objective is achieved by an electric motor comprising a stator and a rotor rotatable relative to the stator as described above. With the rotor according to the invention, fluid can therefore be used not only as primary cooling for the rotor but also as secondary cooling for the stator, particularly its winding heads. This results in remarkably good cooling of the entire electric motor. Attached Figure Description

[0048] Other features, characteristics, and advantages of the invention will become apparent from the following description with reference to the accompanying drawings. In them, schematically:

[0049] Figure 1 The rotor according to the invention is shown.

[0050] Figure 2 The image shows the rotor in operation.

[0051] Figure 3 This illustrates a rotationally symmetric axial segment with a flanged channel.

[0052] Figure 4 This illustrates a rotationally symmetric axial segment with a flange extending along the axial direction.

[0053] Figure 5 : This shows an electric motor. Detailed Implementation

[0054] Figure 1 A rotor 1 for an electric motor is shown according to the prior art. The rotor 1 is supported symmetrically about a rotational axis Rot. An axial direction A is formed by the rotational axis Rot. A radial direction R extends radially about the rotational axis Rot or the axial axis A.

[0055] The rotor R includes a rotor support 2, which is also rotatably supported about the rotation axis Rot. The rotor support 2 is preferably cylindrical, especially hollow cylindrical, and has an internal space 9. Furthermore, the rotor support extends along the axial axis A.

[0056] The rotor support 2 has a cylindrical inner cylinder 3 pointing towards the rotation axis Rot and an opposing cylindrical outer cylinder 4.

[0057] In addition, a component carrying magnetic flux (constructed here as a lamination group 5) is provided, which is arranged on the outer cylinder 4. The lamination group 5 can be composed of axially stacked plates.

[0058] The laminate group 5 has a first end side 6 and a second end side 7 on the axial end side.

[0059] In addition, radial teeth (not shown) are formed in the region of the first end side 6 and the region of the second end side 7 to increase torque strength.

[0060] This means that the outer cylinder 4 has a circumferential direction U in at least the region of the first end side 6. Figure 2 The first radial tooth portion has a first tooth (not shown) pointing towards the stacked plate group 5 and a first tooth root (not shown) located between every two first teeth.

[0061] Furthermore, the outer cylinder 4 has a circumferential direction U in at least the region of the second end side 7. Figure 2 The second radial tooth portion (not shown) has a second tooth (not shown) pointing towards the stacked plate group 5 and a second tooth root (not shown) located between every two second teeth.

[0062] To establish a rotational connection with other components, and to support the rotor 1 or rotor support 2, the rotor support 2 may include a radial section (not shown) on the end side.

[0063] Furthermore, the rotor 1 includes a rotor hub that comprises a rotationally symmetric shaft segment 8. This shaft segment extends along the axial direction A. The rotationally symmetric shaft segment 8 is arranged within the internal space 9 of the rotor support 2.

[0064] In addition, the rotationally symmetric shaft section 8 is supported coaxially with the rotor support 2.

[0065] The rotor 1 is at least partially arranged in a housing (not shown). Here, the housing is configured to guide oil to a rotationally symmetric shaft section 8.

[0066] The rotationally symmetric axial section 8 also has a fluid inlet 10 for allowing oil to enter from the housing (not shown).

[0067] Furthermore, a rotationally symmetrical fluid guide groove 11 is provided in the rotationally symmetrical shaft section 8, and oil entering through the fluid inlet 10 flows into the fluid guide groove. When the rotor 1 rotates, the oil is held in the rotationally symmetrical fluid guide groove 11 on the one hand, and distributed in the rotationally symmetrical fluid guide groove 11 on the other hand.

[0068] Furthermore, the rotationally symmetric shaft section 8 has a plurality of, preferably three, flanges 12 extending in the axial direction A toward the inner cylinder 3 of the rotor support 2. Here, the plurality of flanges extending in the axial direction A have axial flange channels 13.

[0069] Figure 3 These flange channels 13 are shown in detail in a cross-sectional view. The flange 12 is along the circumferential direction U( Figure 2 The flange channels 13 are evenly arranged on the outer side of the rotationally symmetric shaft section 8. The flange channels 13 extending along the axial direction A are preferably introduced as holes. The flange channels 13 are open to the internal space 9 of the rotor support 2.

[0070] Alternatively, flange 12 can also be constructed as a single annular flange, with flange channel 13 along the circumferential direction U( Figure 2 It is evenly introduced into the flange.

[0071] Figure 4 The rotationally symmetric axial segment 8 with a flange 12 extending in the axial direction A is shown in detail.

[0072] Preferably, three flanges 12 extending in the axial direction A are provided.

[0073] In addition, the rotationally symmetric fluid guide channel 11 also has outlets 14, by means of which a fluid connection is formed between the rotationally symmetric fluid guide channel 11 and the flange channel 13.

[0074] During rotation, the oil held in the fluid guide trough 11 by the rotation is transferred to the outlet 14 by means of the rotation, and flows into the flange channel 13 through the outlet.

[0075] Preferably, the flange channel 13 terminates in the central region of the rotor support 2 along the axial direction A, that is, approximately at the axial center of the rotor support 2.

[0076] Here, the central region roughly corresponds to the axial center of the rotor support 2, so that the first end side 6 and the second end side 7 are axially equidistant.

[0077] The flange channel 13 is open on the end side, allowing oil to flow out into the internal space 9.

[0078] Using the centrifugal force generated by the rotation of rotor 1, the outflowing oil flows towards the inner cylinder 3 or the center of the inner cylinder 3.

[0079] Because the flange channel 13 terminates at the axial center or central region of the rotor support 2, the oil flows towards the axial central region of the inner cylinder 3. Through the rotation of the rotor 1 and the collision of the oil in the axial center of the inner cylinder 3, the oil then flows substantially uniformly along the two sides of the inner cylinder 3, that is, the oil flow is evenly distributed on the inner cylinder 3.

[0080] This results in uniform cooling of rotor 1.

[0081] like Figure 1 As further shown, in the rotor support 2, a first radial output opening 15 is provided in the region of the first end side 6, which are respectively arranged in the first tooth root and designed as radial notches in the rotor support 2.

[0082] Therefore, the first radial output opening 15 is configured, for example, as a hole extending from the inner cylinder 3 through the root of the first tooth. With the aid of the first radial output opening 15, oil can pass through the rotor support 2 in the radial direction R.

[0083] Because it is arranged in the tooth root, there is no material loss, as the rotor support 2 is thin-walled in this area. At the same time, oil flows almost throughout the entire inner cylinder 3 to completely or almost completely cool the rotor 1.

[0084] Preferably, three first radial output openings 15 are provided, which are located along the circumferential direction U( Figure 2 They are evenly distributed on the inner cylinder 3.

[0085] also, Figure 1 Second radial outlet openings 16 are also shown, which are arranged in the rotor support 2 in the region of the second end side 7. These second radial outlet openings are arranged in the second tooth root and are also designed as radial notches, wherein these notches are uniformly arranged along the circumferential direction U of the inner cylinder 3. Thus, the second radial outlet openings 16 are configured, for example, as holes extending from the inner cylinder 3 through the second tooth root. When the rotor 1 rotates, fluid can pass through in the radial direction R via the second radial outlet openings 16.

[0086] By being arranged in the tooth root, no material loss occurs in the region of the second end side 7, because the rotor support 2 is thin-walled in this region. At the same time, oil flows almost throughout the entire inner cylinder 3 to completely or almost completely cool the rotor 1.

[0087] Preferably, three second radial output openings 16 are provided, which are located along the circumferential direction U( Figure 2 They are evenly distributed on the inner cylinder 3.

[0088] like Figure 1As further shown, the rotor support 2 has a bearing shoulder 17 on the first end side 6, which is arranged as a radial section on the inner cylinder 3. The inner cylinder 3 and the bearing shoulder 17 can be constructed integrally.

[0089] In addition, the rotor support 2 has a safety ring 18 on the second end side 7, which is also arranged as a radial section on the inner cylinder 3.

[0090] Therefore, the safety ring 18 and the bearing shoulder 17 can fix the laminate group 5 in the axial direction.

[0091] In addition, the bearing shoulder 17 has a first empty portion 19 pointing toward the stacked plate group 5, wherein the first empty portion 19 extends continuously through the bearing shoulder 17 in the radial direction R.

[0092] Preferably, three first empty portions 19 are provided, corresponding to the first radial output opening 15.

[0093] Thus, the oil flowing through the first radial output opening 15 during rotation can further flow to and through the first empty section 19.

[0094] The first void 19 and the first radial output opening 15 can be arranged to be misaligned. In the case of the misaligned arrangement, the oil flowing through the first radial output opening 15 flows along the outer cylinder 4 of the rotor support 2 by rotational motion, and then flows through the first void 19.

[0095] Here, the first empty portion 19 can be constructed as a radially continuous semi-circular groove. Alternatively, the first empty portion 19 can be constructed as a notch or hole opening toward the stacked assembly 5.

[0096] In addition, the safety ring 18 has a second void 20 pointing toward the stack 5, wherein the second void extends continuously through the safety ring 18 in the radial direction R.

[0097] Thus, the oil flowing through the second radial output opening 16 during rotation can further flow through the second recess 20.

[0098] The second void 20 and the second radial output opening 16 can be arranged to be misaligned. In the case of the misaligned arrangement, the oil flowing through the second radial output opening 16 flows along the outer cylinder 4 of the rotor support 2 by rotational motion, and then flows through the second void 20.

[0099] Here, the second empty portion 20 can be constructed as a radially continuous semi-circular groove. Alternatively, the second empty portion 20 can be constructed as a notch or hole opening toward the stacked assembly 5.

[0100] Furthermore, a first fluid guide disk (configured herein as a first oil guide disk 21) is arranged on the first end side 6 of the lamination group 5, which follows the bearing shoulder 17 in the radial direction R. This means that the first oil guide disk 21 is arranged axially beside the lamination group 5, so that when rotated, the fluid flowing through the first void 19 in the bearing shoulder 17 flows along the first oil guide disk 21.

[0101] Furthermore, the first oil guide plate 21 has a first annular section 23 pointing away from the stacked plate group 5. Therefore, the first annular section corresponds to, to some extent, to the annular protrusion along the axial direction A. The first annular section 23 is arranged on the first oil guide plate 21 on the radial end side, i.e., away from the bearing shoulder 17. The oil flowing through the bearing shoulder 17 thus flows along the first oil guide plate 21 in the radial direction R due to rotational motion, i.e., the resulting centrifugal force, and is thrown out along the axial direction A through the first annular section 23. Due to the centrifugal force acting on the oil thrown out along the axial direction A, the thrown-out oil then flows in the radial direction R.

[0102] There, the oil collided with stator 26 ( Figure 5 ) two winding heads 29 ( Figure 5 The oil is used not only as primary cooling for rotor 1, but also as primary cooling for stator 1. Figure 5 ) two winding heads 29 ( Figure 5 Secondary cooling.

[0103] Furthermore, the winding head 29 can be realized through this rotor 1 according to the invention. Figure 5 ( ) wets, while maintaining an appropriate distance from insulating components or parts.

[0104] Furthermore, a second fluid guide disk (here configured as a second oil guide disk 22) is arranged on the second end side 7 of the lamination group 5, which follows the safety ring 18 in the radial direction R. This means that the second oil guide disk 22 is arranged axially beside the lamination group 5, so that the fluid flowing through the second void 20 in the safety ring 18 during rotation flows along the second oil guide disk 22.

[0105] Furthermore, the second oil guide plate 22 has a second annular section 24 pointing away from the stacked plate group 5. The second annular section therefore corresponds to a certain extent to the annular protrusion along the axial direction A. The second annular section 24 is arranged on the second oil guide plate 22 on the radial end side, that is, away from the safety ring 18.

[0106] The oil flowing through the safety ring 18 is thus propelled radially along the second oil guide plate 22 by rotational motion, i.e., the resulting centrifugal force, and is ejected axially through the second annular section 24. Due to the centrifugal force acting on the oil ejected axially, the ejected oil then flows radially along the R.

[0107] There, the oil collided with stator 26 ( Figure 5 ) two winding heads 29 ( Figure 5 The oil is used not only as primary cooling for rotor 1, but also as primary cooling for stator 26. Figure 5 ) two winding heads 29 ( Figure 5 Another secondary cooler.

[0108] Furthermore, the winding head 29 can be realized through this rotor 1 according to the invention. Figure 5 ( ) wets, while maintaining an appropriate distance from insulating components or parts.

[0109] Here, the first oil guide plate 21 and the second oil guide plate 22 are preferably constructed identically.

[0110] In addition, the first oil guide plate 21 and the second oil guide plate 22 are made of non-conductive materials or have a non-conductive coating.

[0111] Figure 2 Rotor 1 in operation is shown.

[0112] Oil or another cooling fluid passes through the housing (not shown) and through the fluid inlet 10 of the rotationally symmetrical axial section 8. Figure 3 The oil flows into the fluid guide channel 11 of the rotationally symmetric shaft section 8. By rotating (due to the so-called centrifugal force generated by the rotation), the oil is retained in the fluid guide channel 11 on the one hand, and on the other hand it is transferred to the flange 12 arranged on the rotationally symmetric shaft section 8.

[0113] Preferably, three such flanges 12 are evenly distributed along the circumferential direction U. Oil flows through outlet 14 ( Figure 4 The oil flows into the axial flange channel 13 integrated into the flange 12, wherein the axial flange channel 13 preferably extends to the center of the inner cylinder 3 of the rotor support 2. The oil flows into the internal space 9 of the rotor support 2 through the axial flange channel 13.

[0114] Through centrifugal force, the oil flows into the central region of the inner cylinder 3 of the rotor support 2. From there, the oil is evenly distributed on the inner cylinder 3 in two directions, that is, until it reaches the first end side 6 and the opposite second end side 7.

[0115] In the region of the first end side 6, oil flows through the inner cylinder 3 into the first tooth root via the first radial outlet opening 15. Preferably, three such first radial outlet openings 15 are provided.

[0116] In the region of the second end side 7, oil flows through the inner cylinder 3 into the second tooth root via the second radial outlet opening 16. Preferably, three such second radial outlet openings 16 are provided.

[0117] Subsequently, the oil flowing through the first radial outlet opening 15 flows on the outer cylinder 4 by centrifugal force until it reaches the first void 19 in the bearing shoulder 17. Through the first void 19 in the bearing shoulder 17, the oil can flow radially across the bearing shoulder 17 until it reaches the first oil guide plate 21.

[0118] Using centrifugal force, the oil flows radially along the first oil guide plate 21, so as to eventually be thrown out / flow out axially through the first annular section 23. Through rotation, the oil wets the stator 26. Figure 5 ) winding head 29 ( Figure 5 )one of the.

[0119] In addition, the oil flowing through the second radial outlet opening 16 flows on the outer cylinder 4 by centrifugal force until it reaches the second cavitation portion 20 in the safety ring 18.

[0120] Through the second empty portion 20 in the safety ring 18, the oil can flow radially through the safety ring 18 until it reaches the second oil guide plate 22.

[0121] Using centrifugal force, the oil flows radially along the second oil guide plate 22, so as to eventually be thrown out / flow out axially through the second annular section 23. Through rotation, the oil wets the stator 26. Figure 5 ) winding head 29 ( Figure 5 ).

[0122] The transfer to the first oil guide plate 21 and the second oil guide plate 22 is implemented such that only minimal axial structural space is required. This in particular means that the first empty portion 19 and the second empty portion 20 are implemented as small as possible.

[0123] Therefore, the oil is used for primary cooling of rotor 1, and also for cooling of stator 26. Figure 5 ) winding head 29 ( Figure 5 Secondary cooling.

[0124] With the rotor 1 according to the present invention, no additional axial structural space is required.

[0125] Furthermore, positive balance can be achieved by utilizing the weight within the existing openings, since all previous openings still exist.

[0126] Figure 5An electric motor 25 according to the invention is shown. The electric motor has a stator 26 with a stator yoke 27. The stator 26 has stator slots (not shown) with windings 28, which are designed as winding heads 29 at their ends. The electric motor also has a rotor 1 according to the invention, which is rotatably supported about a rotation axis Rot. This rotor can drive a transmission 30.

[0127] The stator 26 and the rotor 1 are supported coaxially with each other.

[0128] List of reference numerals

[0129] 1. Rotor

[0130] 2 Rotor support

[0131] 3 Inner cylinder

[0132] 4 outer cylinder

[0133] 5-piece stack

[0134] 6 First end side

[0135] 7 Second end side

[0136] 8-axis section

[0137] 9. Interior Space

[0138] 10 Fluid inlet

[0139] 11 Fluid guiding channel

[0140] 12 flanges

[0141] 13 Axial flange channel

[0142] 14 Exports

[0143] 15 First radial output opening

[0144] 16 Second radial output opening

[0145] 17. Bearing shoulder

[0146] 18 Safety Ring

[0147] 19 First Empty Section

[0148] 20 Second blank space

[0149] 21 First oil guide plate

[0150] 22 Second oil guide plate

[0151] 23 First Ring Section

[0152] 24 Second Ring Section

[0153] 25 Electric Machines

[0154] 26 stators

[0155] 27 Stator yoke

[0156] 28 windings

[0157] 29 Winding head

[0158] 30 Transmission device

Claims

1. A rotor (1) for an electric motor (25), the rotor having A rotor support (2) is rotatably supported about a rotation axis (Rot), wherein the rotation axis (Rot) forms an axial direction (A) and a radial direction (R) extending about the axial direction (A), wherein the rotor support (2) has a cylindrical inner cylinder (3) pointing toward the rotation axis (Rot) and an opposing cylindrical outer cylinder (4). Rotor components carrying magnetic flux The cylindrical outer cylinder (4) carries the rotor component carrying magnetic flux, wherein the rotor component carrying magnetic flux has a first end side (6) and a second end side (7) on its axial end side. A rotationally symmetric shaft segment (8) extends along an axial direction (A) and is arranged within the internal space (9) of the rotor support (2), and is coaxially supported with the rotor support (2). Furthermore, the outer cylinder (4) has a first radial tooth in the circumferential direction (U), at least in the region of the first end side (6), the first radial tooth having a first tooth pointing towards the rotor component carrying the magnetic flux and a first tooth root between every two first teeth. The outer cylinder (4) has a second radial tooth in the circumferential direction (U), at least in the region of the second end side (7), the second radial tooth having a second tooth pointing towards the rotor component carrying the magnetic flux and a second tooth root between every two second teeth. Its features are, The rotationally symmetric shaft section (8) is configured for fluid guidance to the inner cylinder (3) of the rotor support (2), and The first radial output opening (15) is disposed in the rotor support (2) in the region of the first end side (6). The first radial output opening is respectively arranged in the first tooth root and is designed as a radial notch in the rotor support (2). The notch is uniformly arranged along the circumferential direction (U) of the rotor support (2) so that fluid is discharged along the radial direction (R) through the first radial output opening (15) when the rotor (1) rotates. Furthermore, the second radial output opening (16) is disposed in the rotor support (2) in the region of the second end side. The second radial output opening is respectively arranged in the second tooth root and is designed as a radial notch in the rotor support (2). The notch is uniformly arranged along the circumferential direction of the rotor support (2) so that fluid is discharged in the radial direction (R) through the second radial output opening (16) when the rotor (1) rotates.

2. The rotor (1) according to claim 1, characterized in that, The rotationally symmetric shaft section (8) has a plurality of flanges (12) extending in the axial direction (A) toward the inner cylinder (3) of the rotor support (2), wherein the plurality of flanges (12) are uniformly arranged in the circumferential direction (U), and wherein the plurality of flanges (12) extending in the axial direction (A) have axial flange channels (13) for guiding fluid.

3. The rotor (1) according to claim 2, characterized in that, The rotationally symmetrical shaft section (8) has a fluid inlet (10) and a rotationally symmetrical fluid guide groove (11) for guiding the fluid, and an outlet (14) that forms a fluid connection with the flange channel (13), so that when rotating, the fluid flows through the rotationally symmetrical fluid guide groove (11) to the outlet (14), and then flows into and through the flange channel (13).

4. The rotor (1) according to claim 2, characterized in that, The flange (12) and the flange channel (13) extend axially to the axial center of the inner cylinder (3), so that when rotated, the fluid flowing out through the flange channel (13) flows toward the center of the inner cylinder (3) and is distributed substantially evenly from the center to the first radial output opening (15) and the second radial output opening (16).

5. The rotor (1) according to claim 1, characterized in that, The rotor support (2) has a bearing shoulder (17) on the first end side (6), the bearing shoulder being configured as a radial segment on the rotor support (2). Furthermore, the rotor support (2) has a safety ring (18) on the second end side (7), the safety ring being arranged as a radial segment on the rotor support (2), such that the rotor component carrying magnetic flux is fixed between the bearing shoulder (17) and the safety ring (18).

6. The rotor (1) according to claim 5, characterized in that, The bearing shoulder (17) has a first empty portion (19) pointing toward the rotor component carrying magnetic flux, wherein the first empty portion (19) extends continuously through the bearing shoulder (17) in the radial direction (R), so that when rotating, fluid from the first radial output opening (15) flows out radially through the first empty portion (19).

7. The rotor (1) according to claim 6, characterized in that, The first empty portion (19) is constructed as a semi-circular groove.

8. The rotor (1) according to claim 5, characterized in that, The safety ring (18) has a second void (20) pointing toward the rotor component carrying magnetic flux, wherein the second void (20) extends continuously through the safety ring (18) in the radial direction (R), so that when rotating, fluid from the second radial output opening (16) flows out radially through the second void (20).

9. The rotor (1) according to claim 8, characterized in that, The second empty portion (20) is constructed as a semi-circular groove.

10. The rotor (1) according to claim 5, characterized in that, A first fluid guide disk is arranged on the first end side (6) of the rotor component carrying magnetic flux. The first fluid guide disk follows the bearing shoulder (17) in the radial direction (R), so that the fluid flowing through it during rotation flows along the first fluid guide disk through the first void (19) in the bearing shoulder (17). A second fluid guide disk is arranged on the second end side (7) of the rotor component carrying magnetic flux. The second fluid guide disk follows the safety ring (18) in the radial direction (R), so that the fluid flowing through it during rotation flows along the second fluid guide disk through the second void (20) in the safety ring (18).

11. The rotor (1) according to claim 10, characterized in that, The first fluid guide disk is made of a non-conductive material or has a non-conductive coating, and / or the second fluid guide disk is made of a non-conductive material or has a non-conductive coating.

12. The rotor (1) according to claim 10, characterized in that, The first fluid guide disk has a first annular section (23) on the radial end side that is directed away from the rotor component carrying the magnetic flux.

13. The rotor (1) according to claim 10, characterized in that, The second fluid guide disk has a second annular section (24) on the radial end side that points away from the rotor component carrying the magnetic flux.

14. An electric machine (25) comprising a stator (26) and a rotor (1) rotatable relative to said stator (26) according to any one of claims 1 to 13.

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