Laminated core for an electric machine, in particular a motor vehicle, electric machine for a vehicle and vehicle

Abstract

The invention relates to a laminated core (7, 9) for an electric machine (1), the laminated core having at least one cooling channel (14, 15), the cooling channel extending inside the laminated core (7, 9) and being capable of being used for the flow of a cooling fluid through the laminated core (7, 9), wherein the cooling channel (14, 15) has: at least one first flow opening (17, 20), through which the cooling fluid can flow and through a peripheral wall surface (16, 19) of the laminated core (7, 9) on the outer peripheral side pointing outward in a radial direction (12) of the laminated core (7, 9); and at least one second flow opening (18, 22), through which the cooling fluid can flow and through a peripheral wall surface (21, 26) of the laminated core (7, 9) on the inner peripheral side pointing inward in a radial direction (12) of the laminated core (7, 9).

Description

Technical Field

[0001] The present invention relates to a laminated core for an electric motor, in particular a laminated core for an electric motor of a motor vehicle. The present invention also relates to an electric motor for a vehicle. The present invention also relates to a vehicle, in particular a motor vehicle. Background Art

[0002] DE102016222206A1 discloses a motor having a rotor, the rotor having a rotor shaft and a rotor lamination stack supported in two rolling bearings. The motor also includes a stator, the stator having a stator lamination stack and a stator winding head, which are arranged on the opposite end sides of the stator lamination stack. The motor also includes a housing, which surrounds the stator in a radial direction. The rotor lamination stack includes a plurality of laminations stacked in a stacking direction. These laminations each have at least one through-hole, which connects the end sides of the corresponding laminations to each other. The through-holes of the laminations offset in the stacking direction are arranged offset from each other in the circumferential direction of the laminations so as to form at least one spiral cooling channel extending through the rotor lamination stack, which connects the two opposite end sides of the rotor lamination stack to each other.

[0003] Furthermore, EP2783452B1 discloses an electric motor having a rotor and a coolable stator coaxially surrounding the rotor, the stator having an annular stator lamination stack with radially inwardly directed stator teeth. Stator slots for accommodating field windings wound onto the stator teeth are formed between the stator teeth. The stator lamination stack is composed of a plurality of stator laminations, which have through-openings introduced into the stator laminations on the circumferential side in the region of the stator yoke surrounding the stator teeth, the through-openings being aligned with one another in the stator lamination stack and forming cooling channels.

[0004] Furthermore, DE 10 2016 222 331 A1 discloses a stator for an electric machine. The stator has at least one laminated core, in which a plurality of cooling channels are formed, through which a cooling fluid can flow and which can be used to cool the stator and extend in the axial direction of the stator. In this case, the respective cooling channels are completely surrounded by the laminated core in their circumferential direction. Summary of the invention

[0005] The object of the present invention is to further develop a laminated core, an electric machine and a vehicle of the type mentioned in the introduction in such a way that particularly advantageous cooling of the electric machine can be achieved.

[0006] To this end, the present invention proposes a laminated core for an electric machine, the laminated core having a first cooling channel, the first cooling channel extending inside the laminated core and capable of being used for a cooling fluid to cool the laminated core to flow through, wherein the first cooling channel has:

[0007] a first flow opening, through which a cooling fluid can flow and which penetrates a circumferential wall surface of the outer circumference of the laminated core pointing outward in a radial direction of the laminated core; and

[0008] a second through-flow opening, through which a cooling fluid can flow and which penetrates a circumferential wall surface of the inner circumference of the laminated core pointing inwards in the radial direction of the laminated core,

[0009] The first cooling channel extends from the first through-flow opening toward the second through-flow opening obliquely to the radial direction of the lamination stack.

[0010] The first cooling channel extends linearly from the first through-flow opening toward the second through-flow opening,

[0011] The second through-flow opening is configured to receive cooling fluid from a first channel in a shaft surrounded by the lamination stack,

[0012] The first through-flow opening is configured to direct cooling fluid to a second cooling channel in the lamination stack,

[0013] The first through-flow opening is configured to guide the cooling fluid to the second cooling channel in the lamination stack via an air gap between the first through-flow opening and the second cooling channel.

[0014] The second cooling channel is configured to direct cooling fluid to a channel within a bracket surrounding the lamination stack, and

[0015] The cooling fluid can flow through the first cooling channel and the second cooling channel in the same direction.

[0016] The present invention further provides an electric motor for a vehicle, the vehicle being driveable by means of the electric motor, the electric motor comprising at least one laminate stack and a first cooling channel, the first cooling channel extending inside the laminate stack and being capable of being used for a cooling fluid flowing through the laminate stack to cool the laminate stack.

[0017] Wherein, the first cooling channel has:

[0018] a first flow opening, through which a cooling fluid can flow and which penetrates a circumferential wall surface of the outer circumference of the laminated core pointing outward in a radial direction of the laminated core; and

[0019] a second through-flow opening, through which a cooling fluid can flow and which penetrates a circumferential wall surface of the inner circumference of the laminated core pointing inwards in the radial direction of the laminated core,

[0020] The first cooling channel extends from the first through-flow opening toward the second through-flow opening obliquely to the radial direction of the lamination stack.

[0021] The first cooling channel extends linearly from the first through-flow opening toward the second through-flow opening,

[0022] The second through-flow opening is configured to receive cooling fluid from a first channel in a shaft surrounded by the lamination stack, and

[0023] The first through-flow opening is configured to direct cooling fluid to a second cooling channel in the lamination stack,

[0024] The first through-flow opening is configured to guide the cooling fluid to the second cooling channel in the lamination stack via an air gap between the first through-flow opening and the second cooling channel.

[0025] The second cooling channel is configured to direct cooling fluid to a channel within a bracket surrounding the lamination stack, and

[0026] The cooling fluid can flow through the first cooling channel and the second cooling channel in the same direction.

[0027] The invention further provides a vehicle having at least one electric machine according to the invention.

[0028] A first aspect of the invention relates to a laminated core for an electric machine, in particular a laminated core for a vehicle electric machine. The vehicle may be a motor vehicle, in particular a car, for example, configured as a sedan, or another vehicle, such as an air vehicle, in particular an airplane. The laminated core has at least one cooling channel, which extends inside the laminated core and through which a cooling fluid can flow for cooling the laminated core. The cooling fluid is preferably a coolant, such as oil, which enables particularly advantageous heat removal from the laminated core. In other words, a particularly large amount of heat can be transported away from the laminated core in a short time. It is also conceivable that the cooling fluid is a gas, such as air.

[0029] In order to cool the lamination stack and thus the motor particularly effectively and efficiently and thus to achieve, for example, a particularly high operating capacity and / or a particularly high continuous power of the motor, it is provided according to the invention that the cooling channel has at least one first through-flow opening through which a cooling fluid can flow, the first through-flow opening passing through the peripheral wall surface of the lamination stack on the outer peripheral side pointing outward in the radial direction of the lamination stack. Thus, for example, the cooling channel opens outwardly into the surroundings of the lamination stack in the radial direction of the lamination stack. Thus, for example, the cooling fluid can flow from the surroundings through the first through-flow opening in the radial direction or parallel to the radial direction of the lamination stack or oblique to the radial direction of the lamination stack and flow into the cooling channel, or the cooling fluid flowing through the cooling channel can flow through the first through-flow opening in the radial direction of the lamination stack or parallel to the radial direction of the lamination stack or oblique to the radial direction of the lamination stack and thus flow out of the cooling channel and flow into the surroundings or flow to the surroundings.

[0030] In addition, the cooling channel has at least one second through-flow opening through which a cooling fluid can flow, and the second through-flow opening passes through the circumferential wall surface of the inner circumference of the lamination stack that points inward in the radial direction of the lamination stack. As a result, the cooling fluid can flow through the second through-flow opening from the surrounding environment, for example, in the radial direction of the lamination stack, parallel to the radial direction of the lamination stack, or oblique to the radial direction of the lamination stack, and thus flow into the cooling channel through the second through-flow opening, or the cooling fluid flowing through the cooling channel can, for example, especially flow through the second through-flow opening in the radial direction of the lamination stack, parallel to the radial direction of the lamination stack, or oblique to the radial direction of the lamination stack, and thus flow out of the cooling channel through the second through-flow opening and flow to the surroundings of the lamination stack or flow into the surroundings of the lamination stack.

[0031] The invention is based in particular on the recognition that in conventional electric machines the lost heat in the lamination stack and in at least one winding is preferably conducted away by heat conduction into a cooling jacket and transported there, for example, by a coolant. However, this results in long paths for achieving adequate heat transfer and, in addition, in particular when cooling channels extend outside the lamination stack, adequate heat dissipation is impaired by undesired heat transfer. It is conceivable to combine this cooling with oil cooling, in which the oil can move freely and can additionally transport the lost heat. In the case of oil cooling, the oil is preferably brought to certain critical locations of the electric machine by means of a pump. In particular, side effects may also occur due to the oil in the rotor of the electric machine and in the air gap between the rotor and the stator of the electric machine.

[0032] The above-mentioned problems and disadvantages can now be avoided by the laminated core according to the invention. Since the cooling channels extend inside the laminated core and provide flow openings to or into the surroundings, particularly advantageous internal cooling of the laminated core, in particular oil cooling, can be achieved.

[0033] Preferably, a plurality of additional cooling channels extend inside the lamination stack, wherein the embodiments of the first cooling channel in the front and rear can be transferred to the plurality of additional cooling channels, and vice versa. In particular, direct cooling of the teeth of the lamination stack can be achieved by corresponding cooling channels, wherein the teeth, for example, carry at least one or exactly one winding or at least one or exactly one winding wire forming at least one winding. As a result, heat can be effectively and efficiently transported away from the unit and therefore from the winding or from the winding wire. In particular, a cooling fluid, for example, configured as oil, can be directed through the cooling channels in a targeted manner by the lamination stack according to the invention. The lamination stack according to the invention can, for example, be a component of a rotor and therefore a rotor lamination stack of an electric machine. It is also conceivable that the lamination stack according to the invention is a component of a stator and therefore configured as a stator lamination stack. In other words, the following and previous embodiments of the laminated core can be transferred to the rotor and thus to the laminated core of the rotor and to the stator and thus to the laminated core of the stator, so that the cooling fluid can be particularly advantageously and in particular at least substantially directly conducted through the laminated core or into the laminated core of the rotor and the stator. In particular, it is possible to conduct or allow the cooling fluid, also referred to as coolant, from the inside first through the laminated core of the rotor, then through the air gap between the rotor and the stator and then through the laminated core of the stator, so that the electric machine can be cooled particularly efficiently.

[0034] It has proven to be particularly advantageous if the cooling channel extends from the first through-flow opening parallel to or in the radial direction of the laminated core, in particular without interruption or continuously, towards the second through-flow opening, so that the cooling channel then extends perpendicularly to the axial direction of the laminated core, in particular without interruption or continuously, from the first through-flow opening towards the second through-flow opening. As a result, the flow path of the cooling fluid through the cooling channel from one through-flow opening to the other through-flow opening can be kept particularly short, so that heat can be transported away from the laminated core particularly effectively and efficiently.

[0035] In a particularly advantageous embodiment of the invention, it is also provided that the cooling channel extends from the first throughflow opening (in particular without interruption or continuously) to the second throughflow opening obliquely to the radial direction of the laminated core and thus obliquely to the axial direction of the laminated core. This makes it possible to ensure a particularly high strength of the laminated core, while at the same time effectively and efficiently cooling the laminated core and thus the electric machine. If the cooling channel extends from the first throughflow opening (in particular without interruption or continuously) to the second throughflow opening obliquely to the radial direction of the laminated core and obliquely to the axial direction of the laminated core, the cooling channel extends obliquely and here at least substantially conically through the laminated core.

[0036] In order to achieve particularly effective and efficient cooling, it is provided in a further embodiment of the invention that the cooling channel extends in a straight line from the first through-flow opening (in particular without interruption or continuously) to the second through-flow opening.

[0037] Another embodiment is characterized in that, in particular over the entire extension of the cooling channel extending uninterruptedly from the first flow opening to the second flow opening, the cooling channel is completely circumferentially and directly defined by the lamination stack in the circumferential direction of the cooling channel. The feature "the cooling channel is directly defined by the lamination stack" can be understood to mean that the cooling fluid flowing through the cooling channel can directly flow into or directly contact the lamination stack or the corresponding wall area of ​​the lamination stack that directly defines the cooling channel. As a result, a particularly advantageous, effective and efficient heat transfer from the lamination stack to the cooling fluid flowing through the cooling channel can be achieved, whereby the lamination stack and thus the electric machine can be cooled particularly effectively and efficiently.

[0038] In another embodiment of the present invention, the lamination stack is composed of a plurality of lamination sections which are arranged one after another in the axial direction of the lamination stack, and these lamination sections are connected to each other, for example. Here, the cooling channel is composed of corresponding through-openings of the lamination sections. These lamination sections are also referred to as single laminations, wherein the corresponding through-openings are configured as cutouts, for example. The corresponding cutouts are introduced, in particular stamped, into the corresponding lamination sections, for example. This ensures a particularly high strength of the lamination stack. In order to ensure a particularly high strength of the lamination stack, the corresponding through-openings are preferably introduced into the corresponding lamination sections only as short cutouts.

[0039] It has proven to be particularly advantageous if the through-openings are arranged offset relative to one another in the radial direction of the lamination stack. Thus, for example, respective first portions of the through-openings overlap or cover one another, while respective second portions of the through-openings are arranged without overlapping one another. In other words, the through-openings or cutouts for successive lamination sections are arranged at different positions, in particular in the radial direction, so that the cutouts in the overview preferably result in cooling channels in the radial direction, in particular so that the cooling channels extend obliquely through the lamination stack and here conically or conically through the lamination stack. In particular, it is possible hereby to guide the cooling fluid particularly advantageously through the lamination stack on its path through the cooling channels and therefore through the through-openings in a straight line and obliquely to the axial direction and obliquely to the radial direction, so that an advantageous heat discharge can be ensured.

[0040] In particular, since the cooling channel is inclined to the axial direction and inclined to the radial direction and therefore extends at least substantially obliquely, the lamination section and therefore the lamination stack and the through opening and the cooling channel can be manufactured in a simple and cost-effective manner, for example, by means of a follow-up cutting tool with a selective punching die, wherein the high strength of each lamination section itself can be achieved and the high strength of the lamination stack can be achieved overall. Any problem with the cooling fluid or a part of the cooling fluid that can reach the lamination interspace due to the back pressure can be offset by the efficient outflow feasibility of the cooling fluid. The cooling fluid in the air gap can be sucked out through the cooling channel or through the cooling channel in particular in the stator, for example, by a suction stage, so as to minimize the loss. Therefore, a suction device is preferably provided, by means of which the cooling fluid contained in the air gap can be sucked out of the air gap. Here, the air gap is arranged between the stator and the rotor in the radial direction and is, for example, defined by the stator, especially by the nail lamination stack, outwardly (especially directly) in the radial direction, and defined by the rotor, especially by the rotor lamination stack, inwardly (especially directly) in the radial direction.

[0041] Alternatively or additionally, it is conceivable that a (particularly variable) delivery pump is provided for delivering the cooling fluid, in particular through the cooling channels. By means of a delivery pump, whose delivery capacity is, for example, adjustable, in particular adjustable, for example, a cooling line, by means of which the laminated core or the electric machine is cooled or is to be cooled, can be adjusted in a targeted and desired manner, so that a cooling device, for example, which is designed as an oil cooler, can be adjusted and adapted in a targeted and desired manner by changing or adjusting the delivery capacity of the delivery pump.

[0042] A second aspect of the invention relates to an electric machine for a vehicle, which can be driven, in particular electrically, by means of the electric machine and is designed, for example, as a motor vehicle, in particular as a car and preferably as a passenger car. The vehicle can be a land vehicle or an air vehicle, so that the electric machine can be, for example, an aircraft drive or a component of such an aircraft drive. The electric machine has at least one laminated core, in particular at least one laminated core according to the first aspect of the invention, and has at least one cooling channel extending inside the laminated core, which can be used for a cooling fluid to flow through the laminated core to cool the laminated core.

[0043] In order to be able to cool the motor particularly effectively and efficiently, the present invention provides that the cooling channel has at least one first flow opening through which a cooling fluid can flow, and the first flow opening passes through the peripheral wall surface of the outer peripheral side of the laminated core pointing outward in the radial direction of the laminated core. In addition, the cooling channel has at least one second flow opening through which a cooling fluid can flow and through the peripheral wall surface of the inner peripheral side of the laminated core pointing inward in the radial direction of the laminated core. The advantages and advantageous designs of the first aspect of the present invention can be regarded as the advantages and advantageous designs of the second aspect of the present invention, and vice versa.

[0044] It has proven to be particularly advantageous that the lamination stack is surrounded on the outer circumference at least in a partial region by a structural element of the electric machine. In this case, the structural element has at least one channel, which is fluidically connected to the cooling channel via a first throughflow opening. The at least one channel is also referred to as a first channel, for example. The structural element is, for example, a structural element of the stator of the electric machine, wherein the structural element can be, for example, a support of the stator, also referred to as a stator support. In this case, the lamination stack, which is constructed separately from the structural element, is connected to the structural element or is fixed to the structural element. In particular, the lamination stack is carried by the structural element.

[0045] In addition, the electric motor also has, for example, a rotor, which can be driven by the stator and can thus rotate relative to the stator about the axis of rotation. The stator surrounds the rotor at least in one area, wherein, for example, an air gap is provided between the stator and the rotor in the radial direction. For example, the cooling channel leads into the air gap through the second flow-through opening. Thus, for example, the cooling fluid can flow from the air gap through the second flow-through opening into the cooling channel and then flow through the cooling channel. Then, the cooling fluid flowing through the cooling channel can flow out of the cooling channel via the first flow-through opening and flow into the first channel, whereby, for example, the stator or the lamination stack of the stator can be effectively and efficiently cooled.

[0046] Another embodiment is characterized in that the lamination stack surrounds at least a portion of a component of the motor, wherein the component has at least one guide element, which is connected to the cooling channel fluid via a second flow-through opening. The component is, for example, a component of the rotor of the motor, wherein the component can be, for example, the shaft of the rotor. The guide element is also referred to as the second channel. For example, the cooling fluid flowing through the second channel can flow into the cooling channel via the second flow-through opening and thus flow through the cooling channel. The cooling channel, for example, leads to the air gap described above via the first flow-through opening, so that the cooling fluid flowing through the cooling channel can flow out of the cooling channel via the first flow-through opening and flow into the air gap. Thus, for example, the lamination stack of the rotor and thus the rotor can be effectively and efficiently cooled.

[0047] A third aspect of the invention relates to a vehicle, for example, configured as a motor vehicle, in particular an automobile and preferably configured as a sedan, which has at least one motor according to the second aspect of the invention. For example, the vehicle can be driven by means of an electric motor, in particular electrically, so that the vehicle is configured, for example, as an electric vehicle or a hybrid vehicle. In particular, the vehicle can be configured as a battery electric vehicle (BEV). The advantages and advantageous configurations of the first and second aspects of the invention can be regarded as advantages and advantageous configurations of the third aspect of the invention, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Further details of the present invention are obtained from the following description of preferred embodiments together with the accompanying drawings. In the drawings:

[0049] Figure 1 a schematic and sectional side view showing a section of an electric machine according to the invention for a motor vehicle drivable by means of an electric machine; and

[0050] Figure 2 A schematic front view of a section of an electric motor laminated core is shown. DETAILED DESCRIPTION

[0051] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0052] Figure 1 An electric motor 1 for a vehicle, which is preferably designed as a motor vehicle and in this case as a car, in particular a passenger car, is partially shown in a schematic and cut-away side view. The motor vehicle thus comprises the electric motor 1 in its fully manufactured state and can be driven electrically, for example, by means of the electric motor 1. For this purpose, the electric motor 1 can be operated in a motor operating mode and can therefore be operated as an electric motor. In order to operate the electric motor 1 in the motor operating mode, the electric motor 1 is supplied with electrical energy or current. The electrical energy or current supplied or to be supplied to the electric motor 1 in the motor operation is stored, for example, in a device of the motor vehicle designed to store electrical energy and is Figure 1The energy storage device 2 is particularly schematically shown in the diagram. The motor 1 and the energy storage device 2 are preferably configured as high-voltage components, so that the corresponding voltage of the corresponding high-voltage component, in particular the corresponding operating voltage or rated voltage is greater than 12 volts and preferably at least 48 volts. Preferably, the voltage, in particular the operating voltage or the rated voltage is greater than 48 volts and preferably greater than 50 volts. Preferably, the voltage, in particular the operating voltage or the rated voltage is several hundred volts, so that a particularly large electrical power can be achieved for electrically driving a motor vehicle. In particular, the energy storage device 2 can be configured as a battery, in particular a high-voltage battery (HV battery). The motor 1 has a stator 3 and a rotor 4, which can be driven by the stator 3 and can thus rotate relative to the stator 3 around an axis of rotation 5. In the motor operating mode, the rotor 4 is driven by the stator 3 and can thus rotate relative to the stator 3 around the axis of rotation 5.

[0053] The rotor 4 has a shaft 6, also referred to as a rotor shaft, via which the electric machine 1 can provide a torque for electrically driving a motor vehicle at least in its motor operating mode. In addition, the rotor 4 has a first laminated core 7, also referred to as a rotor laminated core, which is non-rotatably connected to the shaft 6. In this case, the laminated core 7 is arranged on the shaft 6. For this purpose, the laminated core 7 has a receiving opening 8 which is designed as a through-opening and is penetrated by the shaft 6. Therefore, at least one length region L is arranged in the receiving opening 8, so that, for example, the laminated core 7 surrounds a length region L, also referred to as a portion of the shaft 6, at least in the circumferential direction of the shaft 6, in particular completely around the shaft 6. In particular, by Figure 1 It can be seen that the shaft 6 is part of the electric machine 1 , in particular of the rotor 4 of the electric machine 1 , wherein the laminated core 7 surrounds at least a length region L of the shaft 6 of the rotor 4 .

[0054] The stator 3 has a second lamination stack 9, also referred to as a stator lamination stack. The stator 3 further comprises a structural element in the form of a support 10 in the present case, which is also referred to as a support element or stator support. In this case, the lamination stack 9 is surrounded on the circumference by the support 10 (structural element) at least in a partial region T, also referred to as a second length region. The lamination stack 9 and the support 10 are components that are constructed separately from each other and connected to each other. In particular, the lamination stack 9 is held or fixed on the support 10. For example, the lamination stack 7 and the shaft 6 are constructed as components that are constructed separately from each other and connected to each other, wherein the lamination stack 7 is connected to the shaft 6 in a rotationally fixed manner.

[0055] Depend on Figure 1 It can be seen particularly well that in the radial direction of the electric machine 1, between the rotor 4 and the stator 3, in particular between the laminated cores 7 and 9, an air gap 11 is provided, by which the laminated cores 7 and 9 are spaced apart from one another in the radial direction of the electric machine 1. The radial direction of the electric machine 1 and therefore the radial direction of the stator 3 and the rotor 4 is Figure 1 This is illustrated by the double arrow 12. In addition, Figure 1The axial direction of the electric machine 1 and thus of the stator 3 and the rotor 4 is indicated by a double arrow 13, wherein the axial direction extends perpendicularly to the radial direction. The axial direction coincides with the axis of rotation 5 or vice versa, for example. Figure 1 It can be seen that the air gap 11 is bounded in the radial direction of the electric machine 1 outwardly (in particular directly) by the laminated core 9 and in the radial direction inwardly (in particular directly) by the laminated core 7 .

[0056] In the respective lamination stack 7 or 9, that is, inside the respective lamination stack 7 or 9, a plurality of cooling channels 14 or 15 extend respectively, wherein the cooling channels 14 extend inside the lamination stack 7 of the rotor 4 and the cooling channels 15 extend inside the lamination stack 9 of the stator 3. For example, the cooling channels 14 are fluidically connected to one another and / or the cooling channels 15 can be fluidically connected to one another, for example. The respective cooling channels 14 or 15 can be flowed through by a cooling fluid, which is preferably configured as a liquid and is also referred to as a cooling medium or cooling liquid, for cooling the respective lamination stack 7 or 9. In addition, the respective cooling channels 14 or 15 are directly defined by the respective lamination stack 7 or 9 in their respective circumferential direction, in particular completely around. As a result, the cooling fluid flowing through the respective cooling channels 14 or 15 can directly flow against and thus directly contact the respective lamination stack 7 or 9, so that a particularly advantageous, efficient and effective heat transfer from the respective lamination stack 7 or 9 to the cooling fluid flowing through the respective cooling channels 14 or 15 can be achieved. As a result, particularly large amounts of heat can be transported away from the respective laminated core 7 or 9 , so that the electric machine 1 can be cooled advantageously.

[0057] In order to realize a particularly advantageous, effective and efficient cooling of the electric machine 1, which is designed, for example, as a liquid cooler, in particular an oil cooler, the respective cooling channel 14 has at least one first throughflow opening 17 through which a cooling fluid can flow and which passes through an outer peripheral circumferential wall surface 16 of the laminated core 7 pointing outward in the radial direction of the laminated core 7. Furthermore, the respective cooling channel 14 has at least one second throughflow opening 18 through which a cooling fluid can flow and which passes through an inner peripheral circumferential wall surface 26 of the laminated core 7 pointing inward in the radial direction of the laminated core 7.

[0058] The respective cooling channel 15 has at least one first through-flow opening 20 through which a cooling fluid can flow and through the outer peripheral wall surface 19 of the lamination stack 9 pointing outward in the radial direction of the lamination stack 9. In addition, the respective cooling channel 15 has at least one second through-flow opening 22 through which a cooling fluid can flow and through the inner peripheral wall surface 21 of the lamination stack 9 pointing inward in the radial direction of the lamination stack 9. Through the respective through-flow openings 17, 18, 20 or 22, the respective cooling channel 14 or 15 opens into the respective surroundings 23 of the respective lamination stack 7 or 9. The shaft 6, for example, has, in particular, for each cooling channel 14, a first channel 24 through which a cooling fluid can flow, which is fluidically connected to the respective cooling channel 14 through the respective through-flow openings 18. Therefore, the respective cooling channel 14 opens into the channel 24 through the respective through-flow openings 18 at one end. At the other end, the respective cooling channel 14 opens into the air gap 11 through the respective through-flow openings 17.

[0059] The support 10, in particular for each cooling channel 15, has a corresponding guide element in the form of a corresponding second channel 25, which is fluidically connected to the corresponding cooling channel 15 via a corresponding through-flow opening 20. Thus, for example, the corresponding cooling channel 15 opens into the corresponding second channel 25 via the corresponding through-flow opening 20 at one end. At the other end, the corresponding cooling channel 15 opens into the air gap 11 via the corresponding through-flow opening 22. Thus, for example, a cooling fluid that first flows through the corresponding first channel 24 can flow from the channel 24 via the through-flow opening 18 into the corresponding cooling channel 14 and flow through the corresponding cooling channel 14. The cooling fluid that flows through the cooling channel 14 can flow out of the cooling channel 14 through the respective through-flow opening 17 and flow into the air gap 11. The cooling fluid can flow from the air gap 11 through the corresponding through-flow opening 22 and thus into the corresponding cooling channel 15. The cooling fluid flowing through the respective cooling channel 15 can then flow through the respective flow openings 20 and thus flow out of the respective cooling channel 15 via the respective flow openings 20 and flow into the respective channel 25 and then flow through the respective channel 25. In this way, the rotor 4 and the stator 3 and thus the electric machine 1 can be cooled particularly effectively and efficiently as a whole.

[0060] In order to keep the flow path particularly small, the respective cooling channel 14 or 15 extends from the respective flow opening 17 or 20 uninterruptedly or continuously, obliquely to the axial direction and obliquely to the radial direction of the respective laminated core 7 or 9 to the respective flow opening 18 or 22, wherein the respective cooling channel 14 or 15 extends from the respective flow opening 17 or 20 uninterruptedly or continuously in a straight line to the respective flow opening 18 or 22.

[0061] The respective lamination stack 7 or 9 is composed of a respective plurality of lamination sections 27 or 28 which are arranged one after the other in the axial direction of the lamination stack 7 or 9. In this case, the respective cooling channels 14 or 15 are formed by respective through-openings of the lamination sections 27 or 28. This is particularly the case with Figure 2 This can be seen from the laminated core 9 shown there. Figure 2 In FIG. 1 , the through openings of the lamination sections 28 forming the corresponding cooling channels 15 are denoted by 29. Figure 2 It can be seen that the through-openings 29 are arranged offset with respect to one another in the radial direction of the laminated core 9, so that respective first portions of the through-openings 29 overlap one another, while respective second portions of the through-openings 29 are arranged without overlapping one another. As a result, the respective cooling channel 14 or 15 is inclined with respect to the axial direction and with respect to the radial direction and thus extends at least substantially conically through the respective laminated core 7 or 9.

[0062] Especially by Figure 2 Taking the lamination stack 9 as an example, it can be seen that the lamination stack 7 or 9 can have teeth 30, which are arranged one after another in the circumferential direction of the lamination stack 7 or 9. Figure 2 31. For example, at least one winding (not shown in the figures) of the stator 3 or the rotor 4 is wound around the corresponding tooth 30 and is thus held on the corresponding tooth, so that the winding is arranged in the corresponding slot 32 of the corresponding laminated core 7 or 9 arranged between the corresponding teeth 30. Here, the cooling channel 15 extending uninterruptedly and linearly from the through-flow opening 20 to the through-flow opening 22 passes through the tooth 30, so that the through-flow openings 20 and 22 are arranged between the slots 32 in the circumferential direction of the laminated core 9 and are arranged in the teeth 30. As a result, the electric machine 1 can be cooled effectively and efficiently.

[0063] For example, the windings heat up during the motor operating mode. It is conceivable that a cooling fluid mist, for example in the form of oil mist, is generated in the electric machine 1 in order to cool the windings, in particular their winding heads. Alternatively or in addition to this, it is now possible to conduct the cooling fluid through the electric machine 1 in a targeted or controlled manner by means of the cooling channels 14 and 15. In order to prevent, for example, too much cooling fluid from being present or accumulating in the air gap 11, a suction device can be provided, by means of which the cooling fluid or at least a portion of the cooling fluid can be sucked or removed from the air gap 11.

[0064] The cooling fluid first flows through the cooling channel 14 and then from the cooling channel 14 into the air gap 11. The cooling fluid then flows from the air gap 11 and through the cooling channel 15, for example. In this case, a switchable guide device for the cooling fluid is provided, for example, as in a dry sump lubrication system, in particular by the cooling fluid or at least part of the cooling fluid being sucked out of the air gap 11 in a targeted manner. Since the respective cooling channel 14 or 15 is formed by through-openings 29 arranged offset to one another, the laminated sections 27 or 28 and thus the cooling channels 14 and 15 can be produced particularly simply, for example, by rotating the laminated sections 27 or 28 relative to one another during their production. Alternatively or additionally, it is conceivable to use a switchable stamping punch. Thus, the through-opening 29 is produced, for example, by stamping.

[0065] The channel 24 acts as a recess, through which the cooling fluid is conducted out of the cooling channel 14 or introduced into the cooling channel 14. Alternatively or additionally, the channel 25 acts as a recess, through which the cooling fluid is conducted into the cooling channel 15 or conducted out of the cooling channel 15. In particular, an advantageous flow of the cooling fluid through the electric machine 1 can be ensured, so that the cooling fluid does not stop. As a result, a particularly large amount of heat can be transported away in a short time.

[0066] Reference numerals list

[0067] 1 Motor

[0068] 2 Energy storage

[0069] 3. Stator

[0070] 4 Rotor

[0071] 5 Axis of rotation

[0072] 6 Axis

[0073] 7 lamination pack

[0074] 8 Accommodation opening

[0075] 9 lamination pack

[0076] 10 Bracket

[0077] 11 Air Gap

[0078] 12 Double Arrow

[0079] 13 Double Arrow

[0080] 14 Cooling channels

[0081] 15 Cooling channels

[0082] 16 Outer peripheral wall surface

[0083] 17 Flow opening

[0084] 18 Flow opening

[0085] 19 Outer wall surface

[0086] 20 Flow opening

[0087] 21 Inner wall surface

[0088] 22 Flow opening

[0089] 23 Surroundings

[0090] 24 channels

[0091] 25 channels

[0092] 26 Inner wall surface

[0093] 27 lamination section

[0094] 28 lamination sections

[0095] 29 Through opening

[0096] 30 teeth

[0097] 31 Double Arrow

[0098] 32 slots

[0099] L Length area

[0100] T Section

Claims

1. A laminated core for an electric machine (1), the laminated core having a first cooling channel (14), the first cooling channel extending inside the laminated core and being able to be used for a cooling fluid to flow through the laminated core, characterized in that: The first cooling channel (14) has: - a first through-flow opening (17) through which a cooling fluid can flow and which penetrates a peripheral wall surface (16) of the laminated core pointing outward in a radial direction (12) of the laminated core; and a second through-flow opening (18) through which a cooling fluid can flow and which penetrates an inner circumferential wall surface (26) of the laminated core pointing inwards in the radial direction (12) of the laminated core, The first cooling channel (14) extends from the first through-flow opening (17) toward the second through-flow opening (18) at an angle to the radial direction (12) of the lamination stack. The first cooling channel (14) extends linearly from the first through-flow opening (17) toward the second through-flow opening (18), The second through-flow opening is configured to receive cooling fluid from a first channel in a shaft surrounded by the lamination stack, The first through-flow opening is configured to direct cooling fluid to a second cooling channel in the lamination stack, The first through-flow opening is configured to guide the cooling fluid to the second cooling channel in the lamination stack via an air gap between the first through-flow opening and the second cooling channel. The second cooling channel is configured to direct cooling fluid to a channel within a bracket surrounding the lamination stack, and The cooling fluid can flow through the first cooling channel and the second cooling channel in the same direction.

2. The lamination stack according to claim 1, characterized in that: The first cooling channel (14) is directly bounded by the laminated core in a circumferential direction of the first cooling channel (14) over the entire extent of the first cooling channel extending uninterruptedly from the first through-flow opening to the second through-flow opening.

3. The lamination stack according to claim 1, characterized in that: The laminated core is composed of a plurality of laminated core sections (27, 28) which follow one another in the axial direction (13) of the laminated core, wherein the first cooling channel (14) is formed by corresponding through-openings (29) of the laminated core sections (27, 28).

4. The lamination stack according to claim 3, characterized in that: The through openings (29) are arranged offset relative to one another in the radial direction (12) of the laminated core.

5. The lamination stack according to any one of claims 1 to 4, characterized in that: The second cooling channel (15) passes through the teeth (30) of the lamination stack.

6. An electric machine (1) for a vehicle, the vehicle being driveable by means of the electric machine (1), the electric machine comprising at least one laminated core and a first cooling channel (14), the first cooling channel extending inside the laminated core and being capable of being passed through by a cooling fluid for cooling the laminated core, It is characterized in that The first cooling channel (14) has: - a first through-flow opening (17) through which a cooling fluid can flow and which penetrates a peripheral wall surface (16) of the laminated core pointing outward in a radial direction (12) of the laminated core; and a second through-flow opening (18) through which a cooling fluid can flow and which penetrates an inner circumferential wall surface (26) of the laminated core pointing inwards in the radial direction (12) of the laminated core, The first cooling channel (14) extends from the first through-flow opening (17) toward the second through-flow opening (18) at an angle to the radial direction (12) of the lamination stack. The first cooling channel (14) extends linearly from the first through-flow opening (17) toward the second through-flow opening (18), The second through-flow opening is configured to receive cooling fluid from a first channel in a shaft surrounded by the lamination stack, and The first through-flow opening is configured to direct cooling fluid to a second cooling channel in the lamination stack, The first through-flow opening is configured to guide the cooling fluid to the second cooling channel in the lamination stack via an air gap between the first through-flow opening and the second cooling channel. The second cooling channel is configured to direct cooling fluid to a channel within a bracket surrounding the lamination stack, and The cooling fluid can flow through the first cooling channel and the second cooling channel in the same direction.

7. A vehicle comprising at least one electric machine (1) according to claim 6.

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