Motor

Abstract

An electric motor (1) comprises a stator (2) and a rotor (5) arranged on a hollow shaft (7) and rotatable relative to the stator (2) about a rotation axis (6), wherein the hollow shaft (7) has at least one shaft outlet opening (14) in a shaft peripheral wall (13) for a coolant to be supplied to a shaft inner cavity (10) of the hollow shaft (7). A cover element (15) is arranged on the hollow shaft next to the rotor, wherein a fluid channel (16) having a fluid channel inlet (17) and a fluid channel outlet (18) is formed in the cover element, wherein the fluid channel inlet overlaps with the shaft outlet opening (14), and the fluid channel outlet overlaps with a coolant channel inlet (20) of a coolant channel (19), wherein the coolant channel penetrates the rotor in an axial direction with respect to the rotation axis, wherein the coolant channel has a coolant channel outlet (21) on its side opposite to the coolant channel inlet, through which the coolant flows out of the rotor.

Description

Technical Field

[0001] The invention relates to an electric machine having a stator and a rotor arranged on a hollow shaft and rotatable relative to the stator about a rotation axis, wherein the hollow shaft has at least one shaft outlet opening in the shaft circumference / shaft body for a coolant to be supplied to the shaft interior of the hollow shaft. Background Art

[0002] The prior art discloses, for example, document WO 2015 / 132021 A1. This document describes an electric motor having a rotor, a stator, and a speed sensor. The rotor comprises a hollow shaft. A tube that rotates together is mounted on the rotor, and the tube extends into the inner cavity of the hollow shaft, so that a cooling fluid can flow into the inner cavity through the tube. A speed sensor is mounted on the area of ​​the tube that is higher than the hollow shaft. In an electric motor that can be designed as an asynchronous motor, for example, the heat generated in the rotor can be effectively discharged by cooling the hollow shaft. At the same time, since the speed sensor is not arranged on the hollow shaft, but on the tube, it is possible to use a small-structured speed sensor to measure the speed or rotor position.

[0003] Furthermore, document DE 10 2008 001 607 A1 discloses an electric motor for a vehicle, the electric motor having a rotor including a rotor shaft and a cooling device including a coolant. It is proposed that the rotor shaft is designed as a hollow shaft having an inner wall and through which coolant flows, the hollow shaft having at least one coolant conveying element inside thereof, the coolant conveying element being connected to the inner wall of the hollow shaft and conveying the coolant through the coolant conveying element as the hollow shaft rotates. Summary of the invention

[0004] It is therefore an object of the present invention to provide an electric machine which has advantages over known electric machines, in particular allows for more efficient and more effective cooling of the rotor.

[0005] According to the present invention, the above object is achieved by an electric motor. It is proposed that a cover element is arranged on a hollow shaft beside a rotor, a fluid channel including a fluid channel inlet and a fluid channel outlet is formed in the cover element, wherein the fluid channel inlet overlaps with the shaft discharge opening, the fluid channel outlet overlaps with the coolant channel inlet of a coolant channel, the coolant channel penetrates the rotor in an axial direction based on the rotation axis, the coolant channel has a coolant channel outlet on its side opposite to the coolant channel inlet, and the coolant is discharged from the rotor through the coolant channel outlet.

[0006] The electric machine is provided, for example, in the form of an electric motor or a generator. In the case of an electric motor, the electric machine is particularly used to drive a motor vehicle, i.e., to provide a drive torque intended to drive the motor vehicle. In this case, the electric machine may also be referred to as a power motor and is preferably a component of the motor vehicle.

[0007] The electric motor has a stator, a rotor and a hollow shaft. The stator is arranged in a fixed position relative to the motor housing of the electric motor, in particular, it is fastened to the motor housing. The rotor is supported together with the hollow shaft in a rotatable manner relative to the stator, that is, in a rotatable manner around a rotation axis. For this purpose, the rotor is connected to the hollow shaft in a non-rotatable manner, for example, the hollow shaft has a toothed portion on its outer side, and the toothed portion meshes with a matching toothed portion of the rotor in a form-locked manner, so that the rotor is fixedly connected to the hollow shaft in the circumferential direction.

[0008] Preferably, the electric machine is designed as a permanent magnet excited synchronous machine. For this purpose, the rotor has at least one permanent magnet and the stator has at least one electrical winding. Preferably, a plurality of permanent magnets are arranged in the rotor and the stator has a plurality of windings. The opposite design can also be proposed. Of course, other embodiments of the electric machine can also be realized.

[0009] In each case, heat is generated during operation of the electric machine, which heat must be dissipated from the rotor. This is achieved with the aid of a coolant, which is fed into the shaft interior of the hollow shaft. For example, for this purpose a coolant nozzle projects into the hollow shaft or into the shaft interior of the hollow shaft, through which coolant is at least temporarily sprayed into the shaft interior. This allows particularly targeted cooling of the rotor to be achieved.

[0010] For example, it is proposed that the rotor is connected to the hollow shaft in a heat-conducting manner, so that the heat generated in the rotor is discharged through the hollow shaft to the coolant present in the hollow shaft. The coolant then discharges from the shaft interior or from the hollow shaft through at least one shaft discharge opening and reaches the motor housing interior of the motor housing of the electric machine. From the motor housing interior, the coolant is discharged from the electric machine. However, this is relatively inefficient, because the heat is firstly transferred inwardly in the radial direction through the rotor to the hollow shaft, then has to be transferred to the hollow shaft and then to the coolant.

[0011] For this reason, the covering element is a component of the electric machine, which is arranged on the hollow shaft adjacent to the rotor. The covering element is thus arranged next to the rotor in the axial direction. The covering element rests on the rotor and is in particular fastened to the rotor. The dimension of the covering element in the axial direction is significantly smaller than the dimension of the rotor in the same direction. For example, the value of the dimension of the covering element in the axial direction is a maximum of 10%, a maximum of 7.5%, a maximum of 5% or a maximum of 2.5% of the dimension of the rotor in the same direction. In the radial direction, the covering element at least partially covers the rotor, preferably at least 50% or more. Particularly preferably, the covering element completely covers the rotor in the radial direction, so that the outer peripheral surface of the covering element in the radial direction is flush with the outer peripheral surface of the rotor in the radial direction.

[0012] A fluid channel is formed in the cover element, which has a fluid channel inlet on the one hand and a fluid channel outlet on the other hand. The fluid channel inlet is thus connected to the fluid channel outlet in a flow-technical manner via the fluid channel. The fluid channel is formed in the cover element and the cover element is arranged relative to the hollow shaft in such a way that the fluid channel inlet overlaps the shaft outlet opening. The cover element covers the shaft outlet opening of the hollow shaft in such a way that a fluid connection is established between the shaft inner cavity of the hollow shaft and the fluid channel of the cover element. The cover element preferably rests sealingly on the hollow shaft, so that the coolant can only reach the fluid channel from the shaft inner cavity and cannot flow out between the rotor and the hollow shaft.

[0013] The fluid channel is also arranged in the cover element, and the cover element is arranged relative to the rotor in such a way that a fluid channel outlet of the fluid channel overlaps a coolant channel inlet of a coolant channel of the rotor. The coolant channel is formed in the rotor and penetrates the rotor at least partially, preferably completely, in the axial direction. The coolant channel preferably has a continuous straight course and is preferably arranged parallel to the axis of rotation.

[0014] The coolant channel has a coolant channel inlet on the one hand and a coolant channel outlet on the other hand. It is also applicable that the coolant channel inlet is fluidically connected to the coolant channel outlet via the coolant channel. The cover element rests sealingly on the rotor, so that a sealed fluid connection is formed between the fluid channel of the cover element and the coolant channel of the rotor. For example, a seal is provided between the cover element and the rotor for this purpose. It can also be provided that the cover element is connected to the rotor in a material-locking manner, so that a sealed connection is formed.

[0015] In order to cool the electric machine, it is therefore proposed to supply a coolant to the shaft interior of the hollow shaft, for example via a coolant nozzle. The coolant supplied to the shaft interior is discharged from the hollow shaft through the shaft outlet opening of the hollow shaft and into the fluid channel of the cover element. During operation of the electric machine, the coolant is ejected from the shaft outlet opening, for example by the rotational movement of the hollow shaft, i.e. due to the centrifugal force acting on the coolant.

[0016] The coolant flows through the fluid channel of the cover element and then reaches the coolant channel of the rotor. The coolant flows through the coolant channel and then flows out of the coolant channel through the coolant channel outlet and accordingly out of the rotor. During the flow of the coolant, the coolant absorbs heat, thereby cooling the rotor. Due to the fact that the coolant channel directly penetrates the rotor, a particularly efficient and effective heat removal is achieved.

[0017] The cover element also allows the coolant present in the hollow shaft to be fed to the rotor in a very cost-effective manner. It is therefore not necessary to form radial penetrations or the like in the rotor itself, which would allow the coolant to pass directly from the hollow shaft into the rotor. Instead, the cover element allows the constructional complexity to be kept very low and the coolant flow through the electric machine to be designed flexibly.

[0018] The improvement of the present invention proposes that on the side of the rotor opposite to the cover element, an additional cover element is arranged on the hollow shaft, and an additional fluid channel is formed in the additional cover element, and the additional fluid channel includes an additional fluid channel inlet and an additional fluid channel outlet, wherein the additional fluid channel inlet overlaps the coolant channel outlet. In addition to the cover element, there is also an additional cover element. The cover element and the additional cover element receive the rotor between them when viewed in the axial direction, that is, they are arranged on the opposite sides of the rotor. For the additional cover element, reference can be made to the embodiments of the cover element in addition, especially in terms of its arrangement.

[0019] The other covering element is also arranged on the hollow shaft in a manner that is fixed in rotation relative to the cover element. The covering element and the other covering element are also arranged in a manner that is fixed in rotation relative to the rotor. The covering element and the other covering element are respectively in contact with the rotor, that is, preferably in a sealing manner. In the other covering element, there is also a further fluid channel, which connects the further fluid channel inlet with the further fluid channel outlet in a flow-technical manner. The further fluid channel inlet and the further fluid channel outlet are provided on opposite sides of the further fluid channel.

[0020] The further covering element is arranged relative to the rotor in such a way that the further fluid channel inlet overlaps with the coolant channel outlet of the coolant channel formed in the rotor. Accordingly, the further fluid channel is connected to the coolant channel in a flow-technical manner and, via the coolant channel, to the fluid channel of the covering element in a flow-technical manner. The further covering element ensures that the coolant can be discharged or deflected in a structurally simple manner.

[0021] A further development of the invention provides that the further fluid channel outlet is formed on the side of the further cover element facing away from the rotor as viewed in the axial direction, so that the further fluid channel opens into the motor housing interior of the electric machine through the further fluid channel outlet. In such a design or arrangement of the further fluid channel outlet, the further fluid channel outlet is used to discharge coolant from the rotor.

[0022] Since the further fluid channel inlet and the further fluid channel outlet are arranged on opposite sides of the further cover element as viewed in the axial direction, the coolant for cooling the electric machine is discharged into the motor housing interior of the electric machine at a distance from the rotor. The motor housing interior is understood here to be the interior of the motor housing of the electric machine, in which the stator and the rotor are arranged, ie in particular in their entirety. By discharging the coolant at a distance from the rotor, an influence of the coolant on the rotor is reliably avoided.

[0023] A further development of the invention provides that the further fluid channel has a deflection in the further cover element, so that the further fluid channel outlet is formed on the side of the further cover element facing the rotor as viewed in the axial direction. In this embodiment, the coolant is deflected in the direction of the rotor after it has exited the rotor and after it has entered the further cover element, in particular in order to re-introduce the coolant into the rotor. This can further improve the cooling of the rotor.

[0024] The improved solution of the present invention proposes that the additional fluid channel outlet overlaps with the additional coolant channel inlet of the additional coolant channel, and the additional coolant channel runs through the rotor in an axial direction based on the rotation axis. In addition to the coolant channel, another coolant channel is also provided in the rotor. The additional coolant channel has an additional coolant channel inlet and an additional coolant channel outlet, and the additional coolant channel inlet and the additional coolant channel outlet are present on opposite sides of the additional coolant channel. In other words, the additional coolant channel outlet is connected to the additional coolant channel inlet in a flow-technical manner via the coolant channel.

[0025] The further coolant channel at least partially, but preferably completely, passes through the rotor in the axial direction. Similar to the coolant channel, the further coolant channel preferably extends continuously in a straight line and is preferably arranged parallel to the longitudinal center axis. For example, the further coolant channel is arranged overlapping with the coolant channel when viewed in the circumferential direction, that is, it is arranged at the same position when viewed in the circumferential direction. Here, the coolant channel and the further coolant channel are preferably spaced apart from each other in the radial direction. Alternatively, it can be proposed that the coolant channel and the further coolant channel overlap each other when viewed in the radial direction. For example, the coolant channel and the further coolant channel are spaced apart from each other in the circumferential direction.

[0026] The coolant flows through the further coolant channel after the coolant channel and after the coolant has been deflected by the further covering element. In other words, the coolant flows through the rotor several times, i.e. at least once through the coolant channel and at least once through the further coolant channel. This achieves particularly effective cooling of the rotor.

[0027] According to an improved solution of the present invention, a discharge channel having a discharge channel inlet and a discharge channel outlet is formed in the cover element, wherein the discharge channel inlet overlaps with a further coolant channel outlet of a further coolant channel, and the discharge channel outlet is arranged on the side of the cover element facing away from the rotor. The discharge channel is designed in the cover element and has a discharge channel inlet and a discharge channel outlet. The discharge channel outlet is connected to the discharge channel inlet in a flow-technical manner via the discharge channel.

[0028] The cover element is arranged relative to the rotor in such a way that the inlet of the discharge channel overlaps with the outlet of the other coolant channel of the other coolant channel. Therefore, the discharge channel is connected to the other coolant channel in a flow-technical manner and is connected to the other fluid channel via the coolant channel. The discharge channel inlet and the discharge channel outlet are formed on opposite sides of the cover element when viewed in the axial direction. Accordingly, after flowing through the discharge channel, the coolant flows out of the cover element on the side facing away from the rotor, that is, flows into the inner cavity of the motor housing. This avoids the influence of the coolant on the rotor.

[0029] The improvement of the present invention proposes that the coolant channel is a component of a plurality of coolant channels, and the other coolant channel is a component of a plurality of other coolant channels, which are respectively formed in the rotor. Each of the coolant channels is flow-connected to the shaft inner cavity of the hollow shaft via a fluid channel or respectively via one of the plurality of fluid channels. For example, in this case, a plurality of shaft outlet openings are formed in the shaft peripheral wall, so that the above-mentioned shaft outlet opening is one of the plurality of shaft outlet openings.

[0030] It can be provided that one of the shaft outlet openings, in particular exactly one of the shaft outlet openings, is flow-connected to one of the coolant channels, in particular exactly one of the coolant channels, in a flow-technical manner via one of the plurality of fluid channels. However, it can also be provided that the fluid channel has an annular cavity or is designed as an annular cavity and is flow-connected to exactly one shaft outlet opening or a plurality of shaft outlet openings on the one hand and to exactly one coolant channel or a plurality of coolant channels on the other hand.

[0031] Similarly, it can be proposed for the other fluid channel that the other fluid channel is connected to exactly one coolant channel or to a plurality of coolant channels in a flow-technical manner on the one hand and to exactly one other coolant channel or to a plurality of other coolant channels on the other hand. For example, the other fluid channel is configured as an annular cavity for this purpose or at least has such an annular cavity. Particularly preferably, the other fluid channel is one of a plurality of fluid channels. The fluid channels are preferably designed to connect exactly one of the fluid channels to exactly one of the other fluid channels in a flow-technical manner, respectively.

[0032] A particularly preferred embodiment of the electric machine provides that more coolant channels are formed in the rotor than further coolant channels. For example, the coolant channels are twice as many as the further coolant channels. In this regard, only one such further coolant channel is assigned to every two of the coolant channels. The further coolant channels are therefore twice as far apart from one another in the circumferential direction as the coolant channels, since the coolant channels and the further coolant channels are arranged evenly distributed in the circumferential direction in the rotor.

[0033] In the cover element, a fluid channel is provided for each of the coolant channels, which connects the coolant channel to the shaft inner cavity of the hollow shaft in a flow-technical manner. It is preferably proposed for the further cover element that part of the further fluid channel outlets open into the motor housing inner cavity on the side of the further cover element facing away from the rotor, and that further fluid channel outlets are partially provided on the rotor side. This is arranged alternately in the circumferential direction, for example, so that two designs are particularly preferably provided with the same frequency. A part of the coolant flowing through the coolant channel in the direction of the further cover element is discharged into the motor housing inner cavity through the further fluid channel outlet, and another part is sent back into the further coolant channel through the further fluid channel outlet.

[0034] One of the plurality of outlet channels is assigned to each of the additional coolant channels on the side of the cover element, through which the coolant is discharged into the motor housing interior on the side of the cover element. Preferably, the outlet of the additional fluid channel facing away from the rotor overlaps with the outlet of the outlet channel when viewed in the radial direction, so that the coolant is discharged into the motor housing interior at the same radial position.

[0035] A further development of the invention provides that the further fluid channel outlet and / or the outlet of the discharge channel has a flow cross section that differs from the flow cross section of the coolant channel and / or the flow cross section of the further coolant channel. Thus, by replacing the cover element and / or the further cover element, the flow resistance of the coolant through the electric machine can be adjusted in different ways for the same rotor in a simple manner. For example, different electric machines with the same stator but with different cover elements and / or different further cover elements can be realized, which differ from one another in terms of cooling despite the same rotor.

[0036] The improvement of the present invention proposes that the cover element and / or another cover element is made of a material different from the material of the rotor. For example, metal, in particular iron, is used as the rotor material. The cover element and / or another cover element can be made of plastic. In addition or alternatively, the cover element and / or another cover element is made of solid material, that is, solid and integrally. The rotor is preferably composed of a single component made of the material, for example, the rotor is made of a plurality of metal sheets arranged side by side, which are also referred to as rotor laminations. The rotor therefore exists, for example, as a laminated core / laminated stack formed by such rotor laminations. The design achieves cost-effective and flexible manufacturing of the motor.

[0037] The improved solution of the present invention proposes that the rotor is made of a plurality of rotor laminations arranged adjacent to each other, in which coolant channels and / or further coolant channels are formed by stamping. The rotor laminations are preferably made of metal, for example iron. The rotor laminations are individually subjected to a stamping process, during which the coolant channels and / or further coolant channels are respectively formed locally in the corresponding rotor laminations. Subsequently, the rotor laminations are arranged relative to each other so that the individual regions formed by the coolant channels or further coolant channels in the rotor laminations produce the coolant channels and / or further coolant channels. The method can be implemented cost-effectively and simply. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings, without restricting the invention.

[0039] Here it is shown:

[0040] Figure 1 A schematic diagram showing a first specific embodiment of an electric machine having a stator and a rotor,

[0041] Figure 2 A schematic diagram shows a second specific embodiment of an electric machine. DETAILED DESCRIPTION

[0042] Figure 1 The schematic diagram of an electric machine 1 is shown, which has a stator 2 with a laminated core 3, from which winding ends 4 of the windings of the stator 2 protrude on both sides. The rotor 5 of the electric machine 1 is supported so that it can rotate relative to the stator 2 about the rotation axis 6, that is, it is supported by means of a hollow shaft 7. In the embodiment shown here, the hollow shaft 7 is supported rotatably on both sides of the rotor 5, viewed in the axial direction with reference to the rotation axis 6, by means of a bearing 8, that is, it is supported in a motor housing of the electric machine 1 (not shown here). A plurality of magnets 9 are arranged in the rotor 5, only some of which are shown here by way of example. In the embodiment shown here, the electric machine 1 is designed as a permanently excited synchronous machine, so that the magnets 9 are permanent magnets.

[0043] In order to cool the electric machine 1 or the rotor 5, a coolant is at least temporarily / intermittently supplied to the shaft inner cavity 10 of the hollow shaft 7. This is achieved, for example, by means of a coolant nozzle 11. The introduction of the coolant is indicated by way of example by an arrow 12. During the rotational movement of the rotor 5 or the hollow shaft 7, the coolant introduced into the shaft inner cavity 10 is thrown toward the shaft circumferential wall 13 by the centrifugal force acting on the coolant, which radially extends the shaft inner cavity 10 to the outside. A shaft outlet opening 14 is formed on the shaft circumferential wall 13, through which the coolant subjected to the centrifugal force can flow out of the shaft inner cavity 10.

[0044] A cover element 15 is arranged on the hollow shaft 7 adjacent to the rotor 5, in which a fluid channel 16 is formed with a fluid channel inlet 17 and a fluid channel outlet 18. The fluid channel inlet 17 overlaps the shaft outlet opening 14, so that the fluid channel 16 is connected to the shaft interior 10 in a fluid-technical manner. A coolant channel 19 is connected to the fluid channel 16 in a fluid-technical manner via the fluid channel outlet.

[0045] The coolant channel 19 has a coolant channel inlet 20 and a coolant channel outlet 21 and extends in the axial direction through the rotor 5. Here, the coolant channel extends continuously in a straight line and parallel to the axis of rotation 6. The coolant channel inlet 20 overlaps with the fluid channel outlet 18, so that a flow connection is established between the coolant channel 19 and the fluid channel 16. The coolant channel 19 is also in flow connection with the shaft interior 10, via the fluid channel 16.

[0046] On the side of the rotor 5 facing away from the cover element 15, a further cover element 22 is arranged on the hollow shaft 7. In the further cover element 22, there is a further fluid channel 23, which has a further fluid channel inlet 24 and a further fluid channel outlet 25. In the first embodiment shown here, the further fluid channel 23 is connected to the further coolant channel 26 in a flow-technical manner. For this purpose, the further coolant channel inlet 27 is arranged overlapping the further fluid channel outlet 25.

[0047] The further coolant channel 26 has a further coolant channel outlet 28 on its side facing away from the further coolant channel inlet 27. The further coolant channel 26 is connected to a discharge channel 29 in a flow-technical manner via the coolant channel outlet, which has a discharge channel inlet 30 and a discharge channel outlet 31. The discharge channel outlet 31 is formed on the side of the cover element 15 facing away from the rotor 5. After flowing through the coolant channel 19, the further fluid channel 23 and the further coolant channel 26, the coolant can be discharged into the shaft interior 10 through the discharge channel outlet 31, in particular in the direction of the winding head 4. This is indicated by an arrow 32.

[0048] Figure 2 A schematic diagram of a second embodiment of the electric machine 1 is shown. This embodiment is similar in principle to the first embodiment, so that only the differences are explained below with reference to the corresponding embodiment. The difference is that the outlet channel 29 is omitted and the additional fluid channel outlet 25 is not arranged on the side of the additional cover element 22 facing the rotor 5 as in the first embodiment, but on the side facing away from the rotor 5, so that the coolant is discharged into the motor housing interior through the additional fluid channel outlet 25.

[0049] A particularly preferred embodiment combines the first embodiment and the second embodiment, and implements two designs for different coolant channels 19. The first embodiment is implemented for a portion of the plurality of coolant channels 19, and the second embodiment is implemented for another portion of the coolant channels 19. Particularly preferably, the coolant channels 19 according to the designs of the first embodiment and the second embodiment are arranged alternately in a row and next to each other in the circumferential direction. As a result, the coolant is discharged into the motor housing interior to the same extent on both sides of the rotor 5, so that in addition to cooling the rotor 5, the winding heads 4 of the stator 2 are also cooled by means of the coolant.

[0050] The described embodiment of the electric machine 1 allows particularly efficient and advantageous cooling of the electric machine 1 , in particular of the rotor 5 , in a structurally simple manner.

[0051] List of reference numerals:

[0052] 1 Motor

[0053] 2 Stator

[0054] 3-Laminated Core

[0055] 4 Winding ends

[0056] 5 rotors

[0057] 6Rotation axis

[0058] 7Hollow shaft

[0059] 8 Bearings

[0060] 9 Magnets

[0061] 10 Shaft cavity

[0062] 11 Coolant nozzle

[0063] 12 Arrow

[0064] 13 Shaft wall

[0065] 14-axis discharge opening

[0066] 15 Covering elements

[0067] 16 Fluid Channels

[0068] 17 Fluid channel inlet

[0069] 18 Fluid channel outlet

[0070] 19 Coolant channels

[0071] 20 Coolant channel inlet

[0072] 21 Coolant channel outlet

[0073] 22 Additional covering elements

[0074] 23 Additional fluid channels

[0075] 24 Additional fluid channel inlet

[0076] 25 Additional fluid channel outlet

[0077] 26 Additional coolant channels

[0078] 27 Additional coolant channel inlet

[0079] 28 Additional coolant channel outlet

[0080] 29 Exhaust channel

[0081] 30 Exhaust channel inlet

[0082] 31 Exhaust channel outlet

[0083] 32 Arrow

Claims

1. An electric machine (1) comprising a stator (2) and a rotor (5) arranged on a hollow shaft (7) and rotatable relative to the stator (2) about a rotation axis (6), wherein: The hollow shaft (7) has a plurality of first shaft outlet openings (14) and a plurality of second shaft outlet openings in a shaft peripheral wall (13) for supplying coolant to a shaft inner cavity (10) of the hollow shaft (7), wherein the first shaft outlet openings and the second shaft outlet openings alternate with each other in a circumferential direction of the hollow shaft. It is characterized in that A cover element (15) is arranged on the hollow shaft (7) next to the rotor (5), in which a first group of multiple fluid channels (16) with corresponding fluid channel inlets (17) and corresponding fluid channel outlets (18) and a second group of multiple fluid channels with corresponding fluid channel inlets and corresponding fluid channel outlets are formed, wherein a fluid channel inlet (17) of a first group of multiple fluid channels overlaps with a first shaft discharge opening (14), and a fluid channel outlet (18) of a first group of multiple fluid channels overlaps with a corresponding coolant channel inlet (20) of a corresponding first coolant channel (19), the first coolant channel penetrating the rotor (5) in an axial direction based on the rotation axis (6), wherein the fluid channel inlets of the second group of multiple fluid channels overlap with the second shaft discharge opening, and the fluid channel outlets of the second group of multiple fluid channels overlap with corresponding coolant channel inlets of corresponding second coolant channels, the second coolant channels penetrating the rotor in an axial direction based on the rotation axis; The first coolant channel has a coolant channel outlet (21) on its side opposite to the coolant channel inlet (20); the second coolant channel has a coolant channel outlet on its side opposite to the coolant channel inlet; wherein, on the side of the rotor (5) opposite to the cover element (15), an additional cover element (22) is arranged on the hollow shaft (7), in which a first group of a plurality of additional fluid channels (23) including additional fluid channel inlets (24) and additional fluid channel outlets (25) are formed, wherein the additional fluid channel inlets (24) of the first group of a plurality of additional fluid channels (23) overlap with the coolant channel outlets (21) of the corresponding first coolant channels, and the additional fluid channel outlets (25) of the first group of a plurality of additional fluid channels (23) overlap with the additional coolant channel inlets of the corresponding additional coolant channels, and the additional coolant channels penetrate the rotor in an axial direction with respect to the rotation axis; A second group of multiple additional fluid channels including additional fluid channel inlets and additional fluid channel outlets are formed in the additional covering element, wherein the additional fluid channel inlets of the second group of multiple additional fluid channels overlap with the coolant channel outlets of the corresponding second coolant channels, and the additional fluid channel outlets of the second group of multiple additional fluid channels discharge into the motor housing inner cavity; The first coolant channel and the second coolant channel are alternately arranged along the same circumference, so that the coolant is discharged into the inner cavity of the motor housing to the same extent on both sides of the rotor.

2. The motor according to claim 1, characterized in that An outlet channel (29) comprising an outlet channel inlet (30) and an outlet channel outlet (31) is formed in the cover element (15), wherein the outlet channel inlet (30) overlaps with a further coolant channel outlet (28) of a further coolant channel (26), and the outlet channel outlet (31) is present on the side of the cover element (15) facing away from the rotor (5).

3. The motor according to claim 1 or 2, characterized in that: The further fluid channel outlets and / or the outlet channel outlets (31) of the second group of a plurality of further fluid channels have a flow cross section which differs from the flow cross section of the second coolant channel and / or the flow cross section of the further coolant channel (26).

4. The motor according to claim 1 or 2, characterized in that: The further fluid channel outlets and / or the discharge channel outlets (31) of the second group of multiple further fluid channels are arranged overlapping with the winding ends (4) of the stator (2) when viewed in the axial direction, so that the coolant flowing out of the further fluid channel outlets and / or the discharge channel outlets (31) of the second group of multiple further fluid channels is thrown out in the direction of the winding ends (4).

5. The motor according to claim 1 or 2, characterized in that: The cover element (15) and / or the further cover element (22) are made of a material different from the material of the rotor (5).

6. The motor according to claim 1 or 2, characterized in that: The rotor is produced from a plurality of rotor laminations arranged adjacent to one another, in which first coolant channels, second coolant channels and / or further coolant channels (26) are formed by stamping.

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