Rotating electric machine and drive device

Abstract

This invention relates to rotary electric motors and drive systems for motor vehicles. A rotary electric motor is described, comprising a rotor rotatable about a rotation axis and a stator statically arranged relative to the rotor, and at least one fluid supply device (10) arranged statically and fixedly, and a distribution element (60) fluidly connected to the fluid supply device (10) and rotatable relative to the fluid supply device (10), wherein the fluid supply device (10) has a flow channel (20) having an outlet (34) for discharging a volumetric flow (40) of cooling fluid in an outlet direction (50). Furthermore, the rotation axis (61) of the distribution element (60) is arranged relative to the outlet (34) such that the outlet direction (50) extends tangentially to the circumference of the distribution element (60), thereby allowing the volumetric flow (40) of the cooling fluid exiting the outlet (34) to flow tangentially relative to the distribution element (60). The distribution element (60) can be configured such that, due to the rotation of the incident flow, the cooling fluid can be distributed around the rotation axis (61) of the distribution element (60), and the cooling fluid is carried by the distribution element (60). With the rotary motor according to the invention and the drive device equipped with the rotary motor, large-area cooling of the rotary motor can be achieved in a simple and cost-effective manner.

Description

Technical Field

[0001] This invention relates to rotary electric motors and drive devices for motor vehicles. Background Technology

[0002] Various electric drive devices are known from the prior art and are used in drive systems for motor vehicles.

[0003] Such electric drive devices typically include a rotary motor having a rotor rotatable about a rotation axis and a stator statically arranged relative to the rotor, as well as a housing for enclosing the rotor, the rotary motor being disposed within the housing or the housing being formed by the rotary motor. In this case, it is known that cooling is provided for the stator and / or rotor of the rotary motor for the purpose of improving efficiency.

[0004] DE 10 2015 015 797 A1 discloses an electric motor having a rotor and a stator. The stator includes at least one winding having at least one surface facing the rotor, and for the purpose of cooling the winding, the at least one surface can be subjected to cooling liquid sprayed outward from the rotor in a radial direction by rotating the rotor.

[0005] EP 3 059 837 A1 describes a method for surface cooling of at least a portion of an electric motor and a cooling device for carrying out the method. The cooling device is configured to generate a high-pressure flow and a low-pressure flow to produce a coolant flow. For this purpose, the cooling device includes a nozzle that generates the high-pressure flow, wherein the high-pressure flow is designed to pass along the rotor surface of the motor to be cooled by means of the Coanda effect and to entrain the low-pressure flow according to the injection principle.

[0006] WO 2016 132 060 A1 describes a rotating electric machine having a stator having a stator body and a distributor circuit for receiving cooling fluid used to cool the rotating electric machine.

[0007] The distributor circuit is designed to guide cooling fluid into the internal space of the rotating motor in which the stator is located. For this purpose, the distributor circuit has an opening on the side surface facing the stator body, so that cooling fluid can be directly supplied to the stator body.

[0008] JP 2016 149 900 A discloses a cooling structure including a rotary motor, a circulation path, a fluid tank, a recirculation channel, and a valve device.

[0009] The rotating electric motor includes a rotor and a stator, wherein the rotor is arranged in a rotor chamber and the stator is arranged in a stator chamber, and the two chambers are separated from each other by a partition wall in a fluid-tight manner. A circulation path connects the fluid tank to the stator chamber, and a recirculation channel also connects the fluid tank to the stator chamber, wherein a valve device is designed to control the volumetric flow in the recirculation channel. In this respect, the control action of the valve device depends on the fluid pressure present in the stator chamber.

[0010] DE 10 2016 103 408 A1 discloses a stator for an electric motor, the electric motor including a stator core, a coil wound around teeth of the stator core, an outer cylindrical member surrounding the teeth at the yoke of the stator, and a heat-conducting component in contact with the inner peripheral surface of the outer cylindrical member and the coil end of the coil.

[0011] This design allows some of the heat generated at the coils during motor operation to be conducted to the outer cylindrical component via a heat-conducting element, and then dissipated from the outer cylindrical component to the outside air. The motor coils are correspondingly cooled via the heat-conducting element.

[0012] Particularly effective cooling of rotating electrical machines is typically achieved through fluid cooling. In most cases, oil is used as the cooling fluid, which is supplied to the rotor and / or stator to dissipate heat there.

[0013] Typically, for this purpose, oil is supplied to the rotor and / or stator using one of two methods. First, a distribution device can be connected to the rotating component and, during rotation, centrifugal force is used to propel the oil onto the rotor and / or stator.

[0014] Alternatively, the distribution device is arranged on a stationary component to spray oil from the stationary component into the rotor and / or stator in the form of nozzles. However, if the distribution device is designed as nozzles, only a specific section of the circumference of the rotor and / or stator is sprayed, so several nozzles must be distributed around the circumference to ensure uniform cooling of the stator.

[0015] However, centrifugal cooling only adequately distributes the cooling oil or fluid when the fluid-bearing component is rotating. This means that when the fluid-bearing component is stationary, the fluid is not further distributed, and cooling occurs only at certain points, potentially leading to localized overheating at uncooled points. Furthermore, designing the fluid distribution within a rotating fluid-bearing component based on the rotational speed and the present fluid pressure is complex, especially when several fluid output devices are fluidly connected to each other. Summary of the Invention

[0016] Based on this, the present invention aims to provide a rotary motor and a drive device equipped with the rotary motor, which achieves large-area cooling of the rotary motor in a simple and cost-effective manner.

[0017] This objective is achieved by a rotary motor according to the invention as claimed in claim 1. Advantageous embodiments of the rotary motor are given in dependent claims 2 to 9. Additionally, a drive device for a motor vehicle as claimed in claim 10 is provided, the drive device comprising the rotary motor.

[0018] The features of the claims may be combined in any technically useful manner, wherein reference may also be made to the description below and the features from the accompanying drawings, which include supplementary embodiments of the invention.

[0019] In the context of this invention, the terms "axial" and "radial" are always referred to relative to the axis of rotation of the dispensing element.

[0020] This invention relates to a rotary electric motor having a rotor rotatable about a rotation axis and a stator statically arranged relative to the rotor. The rotary electric motor further includes at least one fluid supply device arranged statically and fixedly, and a distribution element fluidly connected to the fluid supply device and rotatable relative to the fluid supply device. The fluid supply device has a flow channel with an outlet for discharging a volumetric flow of cooling fluid in an outlet direction. The rotation axis of the distribution element is arranged relative to the outlet such that the outlet direction extends tangentially relative to the circumference of the distribution element, allowing the volumetric flow of cooling fluid exiting the outlet to flow tangentially relative to the distribution element. The distribution element can be configured to rotate due to the incident flow, thus allowing the cooling fluid to be distributed about the rotation axis of the distribution element, the cooling fluid being carried by the distribution element.

[0021] In this way, cooling fluid can be supplied or distributed to at least one component of the rotating electric motor, particularly the winding head of the winding or stator winding.

[0022] Specifically, the outlet is configured to extend substantially perpendicular to the rotor's axis of rotation, and the axis of rotation of the dispensing element extends parallel to the rotor's axis of rotation.

[0023] The outlet and distribution elements can be arranged and configured such that the volumetric flow of cooling fluid is directed to a portion of the circumference of the distribution element. This means that the vector of the volumetric flow of cooling fluid does not act radially on the outside of the distribution element, but rather on the axial surface of the distribution element; however, it is still not radially relative to the axis of rotation of the distribution element.

[0024] In an advantageous embodiment, the distributing element is a component that is substantially rotationally symmetrical about its axis of rotation.

[0025] Specifically, the dispensing element is a disc or sleeve.

[0026] The distribution element may have at least one radially outwardly directed opening on its circumference. That is, in one embodiment of the distribution element, the opening is configured to extend radially outward from the central axial channel of the distribution element to facilitate centrifugal delivery of the cooling fluid. Furthermore, the edge or surface defining the opening serves as a carrier element in the tangential incident flow of the distribution element, such that the distribution element is configured to rotate not only by friction but also by the hydrodynamic pressure acting on the edge or surface.

[0027] In particular, such radially outward-guided openings can be formed by grooves extending along the entire axial length of a dispensing element designed as a disc or sleeve, or they can be formed as holes in a dispensing element designed as a sleeve.

[0028] Furthermore, the distribution element may include at least one carrier element, through which the volumetric flow of cooling fluid can flow tangentially relative to the at least one carrier element, and thus receive a tangential force on the distribution element due to the hydrodynamic pressure of the cooling fluid. Such a carrier element may be the aforementioned edge or surface of a radially outwardly guided opening, or it may be another element or additional element arranged on the axial end face of the distribution element facing the outlet, or it may be an element arranged in the central axial channel of the distribution element and subjected to the hydrodynamic pressure of the cooling fluid when in the central axial channel. The carrier element arranged in this position may particularly be implemented as a groove formed in the distribution element and extending substantially parallel to the axis.

[0029] The fluid supply device may be arranged on or formed from the stator. Alternatively, the fluid supply device may be arranged on or formed from the housing of the rotating electric machine.

[0030] In another advantageous embodiment, the flow channel is at least partially formed by a longitudinal hole in a screw screwed into a statically fixed element of a rotating motor, wherein the outlet is formed extending from the longitudinal hole in the screw. Specifically, the flow channel extends parallel to the axis of rotation of the rotor. In this embodiment, the dispensing element is positioned axially between the statically fixed element and the screw head, such that the central axial channel of the dispensing element is located on the shank of the screw, wherein sufficient axial clearance exists, on the one hand, between the statically fixed element and the dispensing element, and on the other hand, between the dispensing element and the screw head, allowing the dispensing element to rotate about the shank of the screw.

[0031] Therefore, the rotary motor is designed to enable speed-independent and large-area cooling options for its components, which is easy to design.

[0032] Fluid pressure alone is sufficient to ensure fluid distribution.

[0033] Furthermore, according to the present invention, a drive device for a motor vehicle is provided, the drive device comprising a rotary electric motor according to the present invention and an output device. The output device may in particular be a transmission device or an internal combustion engine.

[0034] The drive unit or rotary motor itself includes a flow generating device for generating a volumetric flow of cooling fluid, which is fluidly connected to the fluid supply device, wherein the flow generating device is designed such that a sufficiently large volumetric flow of cooling fluid can be generated at the outlet, which enables the distribution element to rotate.

[0035] The rotation of the distribution element causes the cooling fluid to be distributed around the outlet of the fluid supply device.

[0036] In one embodiment of the rotating electric machine, the machine is provided with a plurality of fluid supply devices and distribution elements assigned to the plurality of fluid supply devices, particularly on the stator, for the purpose of cooling the stator windings or winding heads. Attached Figure Description

[0037] The invention described above will now be described in detail with reference to the accompanying drawings, which illustrate preferred embodiments, based on relevant technical background. The invention is not limited in any way to purely schematic diagrams, and it should be noted that the embodiments shown in the drawings are not limited to the dimensions shown. In the drawings:

[0038] Figure 1 A first embodiment of a fluid supply device with a distribution element arranged thereon is shown in cross-sectional view;

[0039] Figure 2 A first embodiment of a fluid supply device with a distribution element arranged thereon is shown in an exploded cross-section view.

[0040] Figure 3 A first embodiment of a fluid supply device having a dispensing element arranged thereon is shown in a front view;

[0041] Figure 4 A second embodiment of a fluid supply device having a distribution element arranged thereon is shown in cross-sectional view;

[0042] Figure 5 A second embodiment of the fluid supply device with a distribution element arranged thereon is shown in an exploded cross-section view.

[0043] Figure 6 A second embodiment of a fluid supply device having a dispensing element arranged thereon is shown in a front view;

[0044] Figure 7The various components of the second embodiment of the fluid supply device are shown in a front view; and

[0045] Figure 8 The various components of the second embodiment of the fluid supply device are shown in a front view. Detailed Implementation

[0046] The accompanying drawings show a fluid supply device 10 with dispensing elements arranged thereon in two different variations. First, for the purpose of explaining the invention, reference is made to elements common to both embodiments.

[0047] The rotary motor includes a fluid supply device 10 located on a statically fixed element 1—in this case, the stator. This fluid supply device 10 forms a flow channel 20 through which cooling fluid can flow in volumetric flow. In the embodiment shown here, the statically fixed element 1 itself forms a first section 21 of the flow channel 20. This first section 21 of the flow channel 20 includes an internal thread 11 into which a screw 30 is screwed by means of a corresponding complementary external thread 31. The screw 30 has a longitudinal bore 32 forming a second section 33 of the flow channel 20. The longitudinal bore 32 leads to an outlet 34 through which the cooling fluid volumetric flow 40 can exit in the outlet direction 50.

[0048] Between the statically fixed element 1 and the screw head 35 of the screw 30, a dispensing element 60 is rotatably arranged about a rotation axis 61. In the illustrated embodiment, the rotation axis corresponds to the longitudinal axis of the screw 30.

[0049] Due to the tangential incident flow of the distribution element 60, the hydrodynamic pressure of the cooling fluid volume flow 40 exiting the outlet 34 along the outlet direction 50 causes the distribution element 60 to rotate. Because centrifugal force thus acts on the cooling fluid, the cooling fluid adhering to the distribution element 60 is thrown away from the distribution element 60 and distributed around the fluid supply device 10. This ensures, and especially in the case of multiple fluid supply devices 10 in or on a rotating electric machine, large-area and concentrated cooling of the components of the rotating electric machine.

[0050] in this regard, Figures 1 to 3 The implementation methods shown are the same as Figures 4 to 8 The difference in the implementation shown is that, Figures 1 to 3 In the embodiment shown, the dispensing element 60 is a disc-shaped piece, while Figures 4 to 8 The embodiment shown is sleeve 63.

[0051] Both the disc-shaped part 62 and the sleeve 63 are formed as substantially rotationally symmetrical components, which sit on the shank of the screw 30 through a central opening.

[0052] In the first embodiment shown here, the disc 62 has an opening 64 in the form of a radial groove, which facilitates the radial outward guidance of cooling fluid during the rotational movement of the disc 62.

[0053] In the second embodiment shown here, the sleeve 63 has an opening 64 in the form of a hole, which also facilitates the radial outward guidance of cooling fluid during the rotational movement of the sleeve 63.

[0054] The sleeve 63 also has a plurality of bearing elements 65 distributed radially in the form of grooves to promote the rotational movement of the sleeve 63 when the sleeve is subjected to the hydrodynamic pressure of the cooling fluid.

[0055] The corresponding distribution element 60 is thus rotatably mounted on the screw 30 with an axial clearance, such that the cooling fluid flowing tangentially relative to the distribution element 60 can be thrown away from the distribution element 60 on the incident flow side.

[0056] By means of the rotary motor according to the present invention and the drive device equipped with the rotary motor, large-area cooling of the rotary motor can be achieved in a simple and cost-effective manner.

[0057] List of reference numerals

[0058] 1. Components arranged in a static, fixed manner

[0059] 10. Fluid supply device

[0060] 11 Internal thread

[0061] 20 Flow channels

[0062] 21. The first section of the flow channel

[0063] 30 screws

[0064] 31 External thread

[0065] 32 Longitudinal Holes

[0066] 33. The second section of the flow channel

[0067] 34 Exports

[0068] 35 Screw head

[0069] 40 Cooling fluid volumetric flow

[0070] 50 Export Direction

[0071] 60 Distribution Components

[0072] 61. Axis of rotation

[0073] 62 disc-shaped components

[0074] 63 Sleeve

[0075] 64 Opening

[0076] 65. Carrier components.

Claims

1. A rotary electric motor having a rotor rotatable about a rotation axis, and having a stator statically arranged relative to the rotor, and at least one fluid supply device (10) arranged statically fixedly, and a distribution element (60) fluidly connected to the fluid supply device (10) and rotatable relative to the fluid supply device (10), wherein, The fluid supply device (10) has a flow channel (20) having an outlet (34) for discharging a volumetric flow (40) of cooling fluid in an outlet direction (50), and the axis of rotation (61) of the distribution element (60) is arranged relative to the outlet (34) such that the outlet direction (50) extends tangentially to the circumference of the distribution element (60), thereby allowing the volumetric flow (40) of cooling fluid exiting the outlet (34) to flow tangentially relative to the distribution element (60), and Furthermore, the distribution element (60) can be configured to rotate due to the incident flow, so that the cooling fluid can be distributed about the rotation axis (61) of the distribution element (60), the cooling fluid being carried by the distribution element (60), the flow channel (20) being formed at least partially by the longitudinal hole (32) of the screw (30) screwed into the element (1) of the rotary motor arranged in a statically fixed manner, wherein the outlet (34) is formed in such a way as to extend from the longitudinal hole (32) in the screw (30).

2. The rotary motor according to claim 1, characterized in that, The outlet (34) extends substantially perpendicular to the rotation axis of the rotor, and the rotation axis (61) of the dispensing element (60) extends parallel to the rotation axis of the rotor.

3. The rotary motor according to claim 1, characterized in that, The outlet (34) and the distribution element (60) are arranged and configured such that the volumetric flow (40) of the cooling fluid is directed to a portion of the circumference of the distribution element (60).

4. The rotary motor according to claim 1, characterized in that, The dispensing element (60) is a component that is substantially rotationally symmetrical about the axis of rotation (61) of the dispensing element.

5. The rotary motor according to claim 4, characterized in that, The dispensing element (60) is a disc (62) or a sleeve (63).

6. The rotary motor according to claim 1, characterized in that, The dispensing element (60) has at least one opening (64) that extends radially outward at the circumference of the dispensing element.

7. The rotary electric motor according to any one of claims 1 to 6, characterized in that, The distribution element (60) has at least one carrier element (65) through which the cooling fluid volume flow (40) can flow tangentially relative to the at least one carrier element and thus receive tangential forces generated on the distribution element (60) due to the influence of the hydrodynamic pressure of the cooling fluid.

8. The rotary electric motor according to any one of claims 1 to 6, characterized in that, The fluid supply device (10) i) Arranged on or formed by the stator, or ii) Arranged on or formed from the housing of the rotary motor.

9. A drive unit for a motor vehicle, the drive unit having a rotary motor and an output device according to any one of claims 1 to 8.

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