COOLING DEVICE FOR A STATOR

Abstract

A cooling device (1) for a stator (2) is provided for collecting and distributing a cooling medium for cooling the stator (2). The cooling device (1) has a first collecting ring (5A) arranged on a first side (3A) along a central axis (4), wherein the first collecting ring (5A) is designed to collect a flow of the cooling medium flowing radially outwards on the first side (3A). The cooling device (1) has a second collecting ring (5B) arranged on a second side (3B) along a central axis (4), wherein the second collecting ring (5B) is designed to collect a flow of the cooling medium flowing radially outwards on the second side (3B).The cooling device (1) has a plurality of distribution elements (8) which connect the first collecting ring (5A) and the second collecting ring (5B) to one another and are designed to distribute the cooling medium collected by the first (5A) and / or the second collecting ring (5B) in such a way that the cooling medium distributed by the plurality of distribution elements (8) cools the stator (2).

Description

[0001] The present disclosure relates to a cooling device for a stator for collecting and distributing a cooling medium for cooling the stator; a stator comprising the cooling device; an electric machine having a stator comprising the cooling device; and a motor vehicle having an electric machine comprising the stator with the cooling device.

[0002] An electric machine can typically be in the form of an electric motor and / or a generator, with the electric machine comprising a stator provided with a stator winding and a rotor mounted for rotation about a motor axis. During operation of an electric motor, in which an alternating electric current flows through the stator winding and is thus energized, the rotor rotates in a rotating magnetic field generated by the stator or its stator winding.

[0003] An electrical machine generates heat during operation, which can be dissipated via a cooling system. Various cooling media, such as air, oil, or water, can be used.

[0004] When using an electrical machine, for example in a motor vehicle, cooling of the stator and / or the rotor with a gaseous or liquid cooling medium is typically necessary to ensure the desired continuous performance for such vehicle applications.

[0005] Traditionally, the rotor and stator are supplied with a cooling medium separately. A dedicated supply line and / or dedicated supply access to a cooling medium can be provided for the stator. To cool the stator, it is possible, for example, to arrange a so-called water or cooling medium jacket as a cooling system on the outer circumference of the stator. Such solutions have the disadvantage that, on the one hand, separate coolant access points must be provided for the rotor and the stator, and these require considerable space, so that the necessary installation space must be reserved.

[0006] Traditionally, the rotor and stator can be supplied with a cooling medium separately. One problem with separate cooling medium access for the active parts of the rotor and stator is that conventionally, additional installation space must be provided for these accesses. Another problem is the conventional amount of cooling medium, especially for the rotor of an electrical machine, especially optionally of a current-excited synchronous machine (SSM), since the continuous power here can usually be limited by the rotor temperature. The amount of cooling medium that can be made available to the rotor is usually limited by the stator, since conventionally a certain minimum amount of cooling medium flow must be maintained to ensure sufficient cooling of the stator.

[0007] Against the background of this prior art, the object of the present disclosure is to provide a cooling device which is suitable for enriching the prior art.

[0008] The problem is solved by the features of the independent claims. The subordinate claims and the dependent claims each contain optional developments of the disclosure.

[0009] According to this, the object is achieved by a cooling device for a stator for collecting and distributing a cooling medium for cooling the stator. The cooling device has a first collecting ring arranged on a first side along a central axis, wherein the first collecting ring is designed to collect a flow of the cooling medium flowing radially outward on the first side. The cooling device has a second collecting ring arranged on a second side along a central axis, wherein the second collecting ring is designed to collect a flow of the cooling medium flowing radially outward on the second side. The cooling device has a plurality of distribution elements which interconnect the first collecting ring and the second collecting ring and are designed to distribute the cooling medium collected by the first and / or the second collecting ring such that the cooling medium distributed by the plurality of distribution elements cools the stator.

[0010] A cooling device can be understood as a device designed to enable cooling of a stator. A cooling device can be designed to provide a flow of a cooling medium by collecting and / or distributing the cooling medium for cooling a stator. Heat can be dissipated from the stator by means of the cooling medium.

[0011] A cooling medium (also coolant) can be understood as a liquid and / or gaseous flowable substance which is designed to enable the cooling or cooling of a stator.

[0012] The second side of the cooling device is a side of the cooling device facing away from the first side. The first side and the second side can represent opposite sides of the cooling device. When the cooling device is used as intended, the first or second side of the cooling device can coincide with a first or second side of the stator, for example the A-side or B-side of the stator. When the cooling device is used as intended, the central axis of the cooling device can coincide with a central axis of the stator, around which the stator optionally extends concentrically.

[0013] A collecting ring can be understood as a ring-like and / or annular body which is designed to collect and / or capture cooling medium flowing radially outward perpendicular to the central axis. A collecting ring can have an outer circumferential surface or outer surface and an inner circumferential surface or inner surface. A collecting ring can thus be designed to enable the capture or collection of a radially outward flowing cooling medium flow for cooling a stator. Collecting a radially outward flowing flow of the cooling medium can mean that the cooling device is designed to collect cooling medium that is not supplied through the outer circumference of the stator.

[0014] A collecting ring can be configured to provide a fluidic connection to an opposite collecting ring for cooling a stator. A collecting ring can be configured to be arranged on an end face of the stator.

[0015] A distribution element can be understood as a tubular and / or channel-like conduit structure through which a cooling medium can flow to cool a stator. A distribution element can be designed such that it can guide and / or distribute a cooling medium flow from the first collecting ring to the second collecting ring and vice versa. A distribution element can have a channel-like shape and / or be designed as a channel. Alternatively or additionally, a distribution element can have a tubular shape and / or be designed as a tube.

[0016] It is conceivable for a distribution element to be designed as an open channel. A distribution element may have a U-shaped cross-section. An open area of a distribution element may face the stator and / or the stator winding.

[0017] The plurality of distribution elements can be configured to provide a connection to the first and second collecting rings, respectively, at the first and second ends. Thus, the distribution elements can optionally be connected to the respective collecting rings at the ends by plugging, soldering, and / or gluing.

[0018] Multiple distribution elements can optionally be arranged parallel to the stator winding along a central axis of a stator, allowing heat dissipation from the stator winding in the area of the winding heads of the stator winding. The distribution elements can optionally be arranged at least in sections in the area of their respective outer circumference on the stator teeth of the respective stator slot and / or the stator winding arranged therein.

[0019] The collecting rings can optionally distribute the collected cooling medium essentially evenly among all distribution elements and then discharged again. The distribution elements can be arranged in an installed or mounted situation between a stator and a rotor. The collecting rings and the distribution elements can optionally have an approximately cage-like or cage-shaped structure. Several distribution elements can be fluidically connected to one another by an arrangement between a first and a second collecting ring. The distribution elements are optionally designed and arranged such that a distribution element can conduct cooling medium from a first collecting ring to a second collecting ring and vice versa. The distribution elements can be arranged parallel to one another in the circumferential direction between the collecting rings.

[0020] The cooling medium distributed by the distribution element can absorb heat from the stator winding, the stator and / or the rotor and conduct it from and / or to the collecting ring, which can then dissipate the heat from the stator and / or the stator winding by means of a cooling medium flow.

[0021] The multiple distribution elements can optionally be arranged in the region of an air gap. This allows the rotor to be cooled during electric motor operation by means of the stator's cooling device, optionally via an air gap and / or the resulting cooler ambient air of the stator.

[0022] The cooling device described offers a number of advantages. The cooling device described above can simplify cooling of the rotor and / or stator. In particular, the cooling device can offer the advantage that no separate connections for the inflow of coolant need to be provided for the stator. Furthermore, the cooling device can offer the advantage of increasing the power density of an electrical machine (E-machine), especially with a smaller installation space requirement, and reducing losses when operating an E-machine with such a cooling device.

[0023] The cooling device described advantageously provides a central supply of cooling medium via the rotor or a rotor shaft. This reduces the installation space required to create a drive unit that is as compact and lightweight as possible. This invention can be particularly advantageous when used with rotors of a current-excited synchronous machine (SSM), as a very high volume flow of cooling medium can be available to cool the rotor directly and effectively. The cooling medium can optionally be introduced from one side of the rotor into a hollow rotor shaft and guided to and distributed by the cooling device to the stator via one or more fluid guide channels in the rotor or via any channel system that serves to cool the rotor.The cooling medium can be guided via channels in the rotor, which are arranged in such a way that the escaping cooling medium can be collected in a targeted and controlled manner by a collecting ring of the cooling device on the stator and distributed via a system of distribution elements in the stator core or on the stator winding so that the power lines can be effectively cooled. By arranging a collecting ring with connected distribution elements on the A-side and another collecting ring on the B-side of the stator core, cooling of both sides of the active parts of the stator can be advantageously achieved. The fluid guide channels in the rotor can be designed as or have inlet openings and / or outlet openings for the cooling medium.

[0024] A cooling device according to the disclosure can collect and distribute a cooling medium for cooling a stator. The cooling medium flow on the stator can thus flow from the collecting ring through the stator slots into the winding heads. For this purpose, the respective collecting ring of the cooling device can have a corresponding conduit element for distributing the cooling medium. The cooling medium can then optionally be collected at the lowest point of the housing of the electric machine, filtered, drained, cooled, and made available to the rotor again.

[0025] Possible further developments of the device described above are explained in detail below.

[0026] It is conceivable that the plurality of distribution elements are configured to provide a cooling medium flow between the first and / or second collecting rings along the central axis. This allows effective cooling from both sides of the active parts of the stator to be achieved.

[0027] It is conceivable that the plurality of distribution elements are designed to provide a cooling medium flow in one direction from a first collecting ring to a second collecting ring and / or a cooling medium flow in one direction from a second collecting ring to a first collecting ring. This allows effective cooling from both sides of the active parts of the stator to be achieved.

[0028] It is conceivable that the first and / or second collecting ring are designed to provide a cooling medium flow in the circumferential direction. This allows the cooling medium to be effectively collected, trapped, and / or directed, so that effective cooling can be achieved on both sides of the active parts of the stator.

[0029] It is conceivable that the first and / or second collecting ring has at least one collecting and / or distributing element arranged in the circumferential direction for providing a cooling medium flow in the circumferential direction. The collecting and / or distributing element in the circumferential direction can have a tubular and / or channel-like shape and / or be designed as a tube and / or channel. It is conceivable that the collecting and / or distributing element in the circumferential direction is optionally designed as an open channel or can have a U-shaped cross-section. It is conceivable that the first and / or second collecting ring can have two or more collecting and / or distributing elements arranged parallel in the circumferential direction on the outer surface of the collecting ring. It is conceivable that the first and / or second collecting ring is designed to provide a cooling medium flow in the circumferential direction on an outer surface and / or on an inner surface of the collecting ring.

[0030] It is conceivable that a curvature is optionally provided on an inner surface of the first and / or the second collecting ring in order to guide a cooling medium from the first and / or the second collecting ring to a distribution element, so that a cooling medium flow can flow between the first and / or the second collecting ring.

[0031] It is conceivable that the first and / or second collecting ring optionally has a barrier, such as a wall, on an inner surface in the circumferential direction at an axially outer end of the cooling device. This can reduce the leakage of coolant. It is conceivable that, alternatively or additionally, a sealing element is arranged at an axial end of a collecting ring. The sealing element can optionally be designed as a sealing ring or sealing hoses. This advantageously and easily counteracts any unwanted leakage of coolant in the stator.

[0032] It is conceivable that the first and / or second collecting ring has first conduit elements and second conduit elements for conducting a collected cooling medium. It is conceivable that the first and second conduit elements for receiving a cooling medium are different from one another.

[0033] A conduit element can be understood as a structure arranged on the collecting ring and designed to conduct the cooling medium collected by the collecting ring. A conduit element of the collecting ring can optionally be arranged circumferentially in the area of the opposite end sides of the distribution elements, thereby being fluidly coupled to the collecting ring and the distribution elements.

[0034] A line element in the first collecting ring can be designed to convey the coolant collected by the collecting ring and / or to connect it to an opposite line element in the second collecting ring for conveying the collected coolant. A line element can be arranged on an outer circumferential surface and / or an inner circumferential surface of the collecting ring and can be fluidly coupled to the collecting ring. It is conceivable that the first line elements are arranged on the outer circumference of a collecting ring. It is conceivable that the second line elements are arranged on the inner circumference of a collecting ring. This allows cooling to be achieved optionally from both sides of the active parts of the stator through efficient coolant flow.

[0035] It is conceivable that a cooling medium flow is enabled from a first conduit element of a first collecting ring via a distribution element to a second conduit element of a second collecting ring. It is conceivable that a cooling medium flow is enabled from a second conduit element of a first collecting ring via a distribution element to a first conduit element of a second collecting ring. It is conceivable that the cooling device is designed to provide opposing cooling medium flows via distribution elements between a first collecting ring and a second collecting ring.

[0036] It is conceivable that a cooling medium flow can be established between a first and a second collecting ring, and vice versa, in two opposite directions. It is conceivable that a first conduit element is designed as a tubular and / or channel-like recess or notch on the outer surface of a collecting ring such that a distribution element can be fluidically connected to the outer surface of the collecting ring. It is conceivable that a second conduit element is designed as a tubular and / or channel-like structure on the inner surface of a collecting ring in order to connect a distribution element to the inner surface of the collecting ring.

[0037] It is conceivable that the plurality of distribution elements optionally extend parallel to the central axis of the cooling device. Alternatively or additionally, the plurality of distribution elements can optionally extend obliquely to the central axis, although not completely perpendicular to the central axis.

[0038] It is conceivable that the plurality of distribution elements are designed to connect the first conducting elements of the first collecting ring with the second conducting elements of the second collecting ring and / or the second conducting elements of the first collecting ring with the first conducting elements of the second collecting ring. This allows effective cooling from both sides of the active parts of the stator to be achieved.

[0039] The above description can be summarized in other words and in a possible more concrete embodiment of the disclosure as described below, whereby the following description should not be interpreted as limiting the disclosure.

[0040] With the cooling device described above, it is possible to optionally increase the requirements for the power density of an electrical machine (E-machine), especially with a smaller installation space requirement, and to optimize the losses when operating an E-machine.

[0041] Conventionally, the rotor and stator can be supplied with a cooling medium separately, meaning the stator can have its own supply line and / or its own supply access to a cooling medium. Typically, this can be a water jacket cooling system in the housing or stator cooling via separate oil lines in the stator yoke. If additional rotor cooling is required, this can conventionally be provided via a separate access point, separate from the stator.

[0042] One problem with conventionally separate cooling medium access points for the active parts of the rotor and stator can be that additional space must be provided for each of these access points. Another problem can be the conventionally available amount of cooling medium, especially for the rotor and especially for a current-excited synchronous machine (SSM), since the continuous power in these machines can usually be limited by the rotor temperature. The amount of cooling medium that can conventionally be made available to the rotor can be limited by the stator, since a certain minimum amount of cooling medium flow must be maintained to ensure adequate cooling of the stator.

[0043] With the cooling device described above, a central supply of cooling medium can optionally be achieved via the rotor. This approach can require little installation space in order to create a drive unit that is as compact and lightweight as possible. This cooling device can be particularly advantageous for rotors of a current-excited synchronous machine (SSM), as a very high volume flow of cooling medium can be available to cool the rotor directly and effectively. The cooling medium can be introduced from one side of the rotor into a hollow rotor shaft. The cooling medium can be delivered to the stator via openings or any channel system used to cool the rotor. The delivery can take place via channels in the rotor that are arranged in such a way that the escaping cooling medium can be collected in a targeted and controlled manner by a collecting ring on the stator.The cooling medium can be distributed via a duct system, optionally an open duct system, in the stator core, allowing the power lines to be effectively cooled. Cooling can occur from both sides of the active components, i.e., a collector ring with connected ducts can be provided on the A-side and another on the B-side of the stator core.

[0044] The cooling device can also be referred to as a cooling medium collection and distribution unit (CMSVE). The cooling medium flow on the stator can thus flow from the collecting ring through the stator slots into the winding heads. For this purpose, the collecting ring can have a corresponding receptacle for distributing the cooling medium. The cooling medium can then be collected at the lowest point of the electric motor housing, filtered, drained, cooled, and made available to the rotor again.

[0045] Furthermore, a stator for an electrical machine is provided. The stator has a cooling device for collecting and distributing a cooling medium for cooling the stator. The cooling device has a first collecting ring arranged on a first side along a central axis, wherein the first collecting ring is designed to collect a flow of the cooling medium flowing radially outward on the first side. The cooling device has a second collecting ring formed on a second side along a central axis, wherein the second collecting ring is designed to collect a flow of the cooling medium flowing radially outward on the second side.The cooling device comprises a plurality of distribution elements that interconnect the first collecting ring and the second collecting ring and are configured to distribute the cooling medium collected by the first and / or second collecting ring such that the cooling medium distributed by the plurality of distribution elements cools the stator. This allows the stator to effectively contribute to the optimal performance requirements of an electrical machine.

[0046] It is conceivable that the stator can be partially or completely cooled by the cooling device.

[0047] What has been described above with reference to the cooling device also applies analogously to the stator and vice versa.

[0048] Furthermore, an electric machine with the stator described above is provided. The electric machine has a rotor designed to provide a radially outward flow of a cooling medium via a plurality of radially arranged fluid guide channels in the rotor for cooling the stator. This eliminates the need for an independent supply of a cooling medium for each stator and rotor, thus providing simplified cooling of the electric machine. Furthermore, this results in a particularly suitable electric machine that is improved in terms of its service life and running time.

[0049] It is conceivable that the rotor has a rotor shaft designed to provide a supply of coolant from one side of the rotor shaft into the rotor for cooling the stator. This can provide simplified and efficient cooling of the electric machine.

[0050] It is conceivable that the cooling medium can be introduced from one side of a hollow rotor shaft. The rotor can have several fluid guide channels in the rotor, which serve to cool the rotor and can conduct and / or guide the cooling medium into the first and / or second collecting ring. The cooling medium can be conducted via tubes and / or channels in the rotor, which are arranged in such a way that the escaping cooling medium can be collected in a targeted and controlled manner by a collecting ring.

[0051] It is conceivable that the rotor has cooling tubes and / or cooling channels within the rotor core, which optionally extend at least partially radially to the first and / or second collecting rings. The cooling medium, which can flow through the rotor via cooling tubes and / or cooling channels, can enable partial or complete cooling of the stator and / or the stator winding by the cooling device.

[0052] It is conceivable that the first and / or the second collecting ring of the cooling device for a stator of an electrical machine are designed to collect a cooling medium flow in one flow direction. It is conceivable that the cooling medium can flow in one flow direction from a rotor located in an electrical machine via a plurality of radially arranged fluid guide channels in the rotor of the rotor to a first and / or a second collecting ring. A collecting ring can be designed to guide and / or direct a cooling medium flow for cooling a stator of an electrical machine, in particular a cooling medium flow that flows out from a rotor via cooling medium outlet openings of the rotor.

[0053] It is conceivable that the electric machine is a current-excited synchronous machine in which the rotor (also called a rotor) rotates synchronously with the rotating field of the stator (also called a stator). The rotor can rotate exactly synchronously with the rotating field determined by the grid frequency.

[0054] What has been described above with reference to the cooling device and / or the stator also applies analogously to the electrical machine and vice versa.

[0055] Furthermore, a motor vehicle is provided with the above-described electric machine comprising the stator and / or the cooling device.

[0056] The motor vehicle can be an electric or hybrid vehicle. The motor vehicle can be a passenger car, in particular an automobile, or a commercial vehicle, such as a truck. The motor vehicle can be automated. The motor vehicle can be configured to at least partially and / or at least temporarily assume longitudinal guidance and / or lateral guidance during automated driving of the motor vehicle by means of the control device. Automated driving can occur in such a way that the movement of the motor vehicle is (largely) autonomous. Automated driving can be at least partially and / or temporarily controlled by the control device. It is conceivable for the motor vehicle to intervene in the lateral guidance of the motor vehicle by means of a driver assistance system, actively, e.g., by adjusting an actual steering wheel position, and optionally passively, e.g., by displaying a turn-off instruction.

[0057] What is described above with reference to the cooling device, the stator and / or the electric machine also applies analogously to the motor vehicle and vice versa.

[0058] Below is an optional embodiment with reference to Fig. 1 to 10 are described. Fig. 1 schematically shows a perspective view of a cooling device according to an optional embodiment. Fig. 2 schematically shows a perspective view from above of one side of the cooling device according to an optional embodiment. Fig. 3 schematically shows a perspective view from below of one side of the cooling device according to an optional embodiment. Fig. 4 schematically shows a perspective view of a stator with a cooling device according to an optional embodiment. Fig. 5 schematically shows a perspective view of a stator with a cooling device during assembly according to a first optional embodiment. Fig. 6 schematically shows a perspective view of a stator with a cooling device during assembly according to a second optional embodiment. Fig. 7 schematically shows a perspective view of an electric machine with a rotor comprising a plurality of fluid guide channels in the rotor according to an optional embodiment. Fig. 8 schematically shows a perspective view of an electric machine with a cooling device according to an optional embodiment. Fig. 9 schematically shows a sectional view of the cooling medium guide of an electrical machine with a cooling device according to an optional embodiment. Fig. 10 schematically shows a sectional view of the cooling medium guide of an electrical machine with a cooling device in detail according to an optional embodiment.

[0059] Fig. 1 schematically shows a perspective view of a cooling device 1 according to an optional embodiment.

[0060] The Fig. 1, the cooling device 1, which is only schematically illustrated, has a first collecting ring 5A arranged on a first side 3A along a central axis 4 and a second collecting ring 5B arranged on a second side 3B along a central axis 4. The cooling device 1 has a plurality of distribution elements 8, which, according to the optional embodiment shown, extend parallel to the central axis 4. The plurality of distribution elements 8 are arranged between the first collecting ring 5A and the second collecting ring 5B. The plurality of distribution elements 8 are designed to distribute the cooling medium received by the first 5A and / or the second collecting ring 5B in such a way that the cooling medium distributed by the plurality of distribution elements 8 flows through a stator 2 (see Fig. 4, Fig. 5). The cooling device 1 can optionally form part of a stator or be integrated into a stator. Optionally, the cooling device can be formed as part of a stator core. Optionally, the cooling device can form channels for the flow of the cooling medium by interacting with the stator core.

[0061] Fig. Figure 2 schematically shows a perspective view of a side 3A of a cooling device 1 from above according to an optional embodiment. The arrows show, by way of example, a flow direction of the cooling medium flow through the cooling device 1.

[0062] The Fig. 2, the cooling device 1 shown only schematically comprises a plurality of distribution elements 8 which are coupled to a first collecting ring 5A arranged on one side 3A. Fig. The first conduit elements 6 and second conduit elements 7 shown in Figure 2 for conducting a cooling medium are different from one another. The first collecting ring 5A has first conduit elements 6 on an outer surface and second conduit elements 7 on an inner surface. The first collecting ring 5A has collecting and distributing elements 16 in the circumferential direction, through which the first collecting ring 5A can collect and distribute a cooling medium flow in the circumferential direction. The second collecting ring 5B, which in Fig. 2, also has first line elements 6 and second line elements 7 as well as collecting and distributing elements in the circumferential direction 16. The distributing elements 8 and / or the collecting and distributing elements in the circumferential direction 16 are hollow or have a U-shaped cross-section for distributing a cooling medium.

[0063] The Fig. 2, which can flow from a distribution element 8 via a first line element 6 to the first collecting ring 5A in one direction, can also flow from a second line element 7 via a distribution element 8 to the second collecting ring 5B (not shown) in an opposite direction.

[0064] Fig. Figure 3 schematically shows a perspective view of a first collecting ring 5A of the cooling device 1 from below according to an optional embodiment.

[0065] The first collecting ring 5A in Fig. 3 has a curvature 14 on an inner surface to guide a radially outwardly flowing cooling medium from the collecting ring 5A via a second conduit element 7 to a distribution element 8, so that a cooling medium flow can flow between the first collecting ring 5A and the second collecting ring 5B via distribution elements 8 (not shown). The first collecting ring 5A has an extension 15 in the circumferential direction at an outer end, which is designed to reduce the leakage of cooling medium.

[0066] Fig. 4 schematically shows a perspective view of a stator 2 with a cooling device 1 for cooling a stator 2 according to an embodiment.

[0067] The Fig. 4, the stator 2, which is only schematically illustrated, has a stator winding 12 and a stator core 13. The cooling device 1 is arranged along a central axis 4 such that the cooling device 1 faces the inner surface of the stator 2.

[0068] Fig. 5 schematically shows a perspective view of a stator 2 with a cooling device 1 for cooling the stator 2 during assembly according to a first optional embodiment.

[0069] The Fig. 5, the stator 2, which is only shown schematically, has a stator winding 12 and a stator core 13. The cooling device 1 has a first collecting ring 5A and a second collecting ring 5B, which in the case of the Fig. 5 are not yet fluidically coupled.

[0070] Fig. 6 schematically shows a perspective view of a stator 2 with a cooling device 1 for cooling a stator 2 during assembly according to a second optional embodiment.

[0071] The Fig. 6, the stator 2, which is only schematically shown, has a stator core 13. The cooling device 1 has a first collecting ring 5A on one side 3A and a second collecting ring 5B on one side 3B, which in the case of the Fig. 6 are not yet fluidically coupled.

[0072] The Fig. 5 and Fig. The optional embodiments shown in Figure 6 differ from each other in that, according to the Fig. 5, the stator is already wound and the cooling device is added in the last process step. According to the Fig. In the embodiment shown in Figure 6, however, the cooling device is inserted into the stator laminated core and the winding takes place only in a subsequent process step.

[0073] Fig. 7 schematically shows in a perspective view an electric machine 30 with a rotor 9 comprising a plurality of fluid guide channels 10 in the rotor according to an embodiment.

[0074] The Fig. The electrical machine 30, shown only schematically in Figure 7, has one side 3A and one side 3B. The electrical machine 30 has a stator 2 with a stator winding 12 and a stator core 13. The wall of the hollow rotor shaft 17 has a plurality of fluid guide channels 10 in the rotor, which are arranged at the ends of the rotor 9.

[0075] According to the embodiment shown, the electric machine 30 can have one or more disc-shaped closure elements 18 outside the fluid guide channels 10 in the rotor on one or both sides. The closure elements 18 can be joined to the rotor shaft and can serve to prevent the cooling medium flowing into the fluid guide channels 10 in the rotor from being thrown freely and uncontrolled into the interior of the electric machine 30.

[0076] Fig. Figure 8 schematically shows a perspective view of an electric machine 30 with a cooling device 1 for cooling the stator 2 in the assembled state according to one embodiment. The arrows indicate the direction of the cooling medium flow through the electric machine 30.

[0077] The Fig. The electrical machine 30, shown only schematically in Figure 8, has a rotor 9 comprising a rotor core 11. The rotor 9 has fluid guide channels 10 in the rotor at both ends, which extend axially from a hollow rotor shaft 17 via a rotor core 11. The electrical machine 30 has a stator core 13. The cooling device 1 has a first collecting ring 5A and a second collecting ring 5B, which are arranged on the opposite end faces of the rotor 9 and the stator core 13, respectively.

[0078] The cooling device 1 in Fig. 8 is arranged between the rotor 9 and the stator laminated core 13 in the circumferential direction concentrically around a central axis 4. More precisely, the rotor 9 is surrounded by the cooling device 1 in a cage-like manner. The arrows show that the cooling medium flow flows from the rotor 9 via the fluid guide channels 10 in the rotor to the collecting rings 5A, 5B. The arrows show that the cooling medium flow flows from a first collecting ring 5A to a second collecting ring 5B between the rotor 9 and the stator laminated core 13 along a central axis 4. The distribution elements 8 can be arranged around an outer surface of the rotor laminated core 11. The distribution elements 8 can be surrounded by an inner surface of a stator laminated core 13 and / or a stator winding 12.

[0079] Fig. Figure 9 schematically shows a sectional view of the cooling medium supply of an electric machine 30 with a cooling device 1 according to one embodiment. The arrows indicate the direction of the cooling medium flow through the electric machine 30.

[0080] The Fig. The electrical machine 30, shown only schematically in Figure 9, has one side 3A and one side 3B. The electrical machine 30 has a rotor 9 and a stator 2. The cooling medium is supplied to the electrical machine through a rotor shaft 17 from one side 3B. The cooling medium flows radially outward through axially arranged fluid guide channels 10 in the rotor to the cooling device 1 or to the collecting rings 5A, 5B. The cooling device 1 can guide the cooling medium flow between the rotor 9 and the stator 2 from one side 3A to one side 3B of the electrical machine 30.

[0081] Fig. 10 schematically shows a detailed sectional view of the cooling medium guide of an electric machine 30 according to an optional embodiment with a cooling device 1 according to an embodiment. The arrows indicate the direction of the cooling medium flow through the electric machine 30.

[0082] The Fig. The electrical machine 30, shown only schematically in FIG. 10, has a first collecting ring 5A and a second collecting ring 5B comprising collecting and distributing elements in the circumferential direction 16, which are arranged in the circumferential direction on an outer surface of the first and / or second collecting ring 5A, 5B. The electrical machine 30 has a rotor 9 and a stator 2 with a stator winding 12.

[0083] The cooling medium flows through fluid guide channels 10 arranged axially in the rotor 9 to the inner surface of a first collecting ring 5A. The cooling medium can flow from an inner surface of a first collecting ring 5A via a distribution element 8 to the outer surface of a second collecting ring 5B. The cooling device 1 can direct a cooling medium flow from an inner surface of a first collecting ring 5A to an outer surface of a second collecting ring 5B, thus distributing cooling medium along a stator winding 12 for cooling the stator 2. List of reference symbols 1 cooling device 2 Stator 3A first page 3B second page 4 Central axis 5A first collecting ring 5B second collecting ring 6 first line elements 7 second line elements 8 distribution elements 9 Rotor 10 Fluid guide channel in the rotor 11 Rotor lamination stack 12 Stator winding 13 Stator laminated core 14 Curvature 15 Expansion 16 collecting and distribution elements in the circumferential direction 17 Rotor shaft 18 disc-shaped end element 30 electric machine 100 motor vehicles

Claims

[1] Cooling device (1) for a stator (2) for collecting and distributing a cooling medium for cooling the stator (2), characterized by that the cooling device (1) has: - a first collecting ring (5A) arranged on a first side (3A) along a central axis (4), wherein the first collecting ring (5A) is designed to collect a flow of the cooling medium flowing radially outwards on the first side (3A); - a second collecting ring (5B) arranged on a second side (3B) along a central axis (4), wherein the second collecting ring (5B) is designed to collect a flow of the cooling medium flowing radially outward on the second side (3B); and - a plurality of distribution elements (8) which connect the first collecting ring (5A) and the second collecting ring (5B) to one another and are designed to distribute the cooling medium collected by the first (5A) and / or the second collecting ring (5B) in such a way that the cooling medium distributed by the plurality of distribution elements (8) cools the stator (2). [2] Cooling device (1) according to claim 1, characterized by that the plurality of distribution elements (8) are designed to provide a cooling medium flow between the first (5A) and / or the second collecting ring (5B) along the central axis (4). [3] Cooling device (1) according to claim 1 or 2, characterized by that the first (5A) and / or the second collecting ring (5B) are designed to provide a cooling medium flow in the circumferential direction. [4] Cooling device (1) according to one of the preceding claims, characterized bythat the first (5A) and / or the second collecting ring (5B) has first line elements (6) and second line elements (7) for conducting a collected cooling medium, wherein the first line elements (6) and the second line elements (7) are different from one another. [5] Cooling device (1) according to claim 4, characterized by that the plurality of distribution elements (8) are designed to connect the first line elements (6) of the first collecting ring (5A) to the second line elements (7) of the second collecting ring (5B) and / or the second line elements (7) of the first collecting ring (5A) to the first line elements (6) of the second collecting ring (5B). [6] Cooling device (1) according to one of the preceding claims, characterized by that the distribution elements are each designed to provide a cooling medium flow opposite to the central axis (4) for cooling the stator (2). [7] Stator (2) for an electrical machine (30), characterized by that the stator (2) has a cooling device (1) for collecting and distributing a cooling medium for cooling the stator (2), wherein - the cooling device (1) has a first collecting ring (5A) arranged on a first side (3A) along a central axis (4), wherein the first collecting ring (5A) is designed to collect a flow of the cooling medium flowing radially outwards on the first side (3A); - the cooling device (1) has a second collecting ring (5B) formed on a second side (3B) along a central axis (4), wherein the second collecting ring (5B) is designed to collect a flow of the cooling medium flowing radially outward on the second side (3B); and - the cooling device (1) has a plurality of distribution elements (8) which connect the first collecting ring (5A) and the second collecting ring (5B) to one another and are designed to distribute the cooling medium collected by the first (5A) and / or the second collecting ring (5B) in such a way that the cooling medium distributed by the plurality of distribution elements (8) cools the stator (2). [8] Electrical machine (30) with a stator (2) according to claim 7, characterized by that the electric machine (30) has a rotor (9) which is designed to provide a radially outward flow of a cooling medium via a plurality of radially arranged outlet openings (10) for cooling the stator (2). [9] Electric machine (30) according to claim 8, characterized by that the rotor (9) has a rotor shaft (17) which is designed to provide a supply of the cooling medium from one side of the rotor shaft (17) into the rotor (9). [10] Motor vehicle (100) with an electric machine (30) according to claim 8 or 9 and / or with a stator according to claim 7 and / or with a cooling device (1) according to one of claims 1 to 6.

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