Electric drive and method for producing a heat exchanger unit for use in an electric drive

Abstract

The invention relates to an electric drive device, comprising an electric motor having a stator assembly and an armature assembly, wherein the stator assembly comprises one or more equipped parts extending along the longitudinal rotation axis and equipped with a stator drive device, and one or more conduit guide parts extending along the longitudinal rotation axis. The drive device also comprises a heat exchanger unit for exchanging heat loss energy between the stator assembly and / or the armature assembly and a heat exchanger fluid, wherein the heat exchanger unit has a fluid conduit system through which the heat exchanger fluid can flow, and the fluid conduit system has at least one fluid conduit. Thereby, the fluid conduits extend longitudinally through the stator assembly, wherein each fluid conduit abuts against at least one stator drive device jacket surface of the stator drive device by contact.

Description

Technical Field

[0001] The invention relates to an electric drive and further to a method for producing a heat exchanger unit, in particular for use in an electric drive. Background Art

[0002] Drives, in particular electric drives, have been known for a long time for providing drive torques and drive movements and are preferably used in the field of motor vehicle technology. Drives of this type are often used, for example, to drive actuators, which in the field of motor vehicle technology are often valves, wastegate valves, throttle valves or even windshield wipers.

[0003] Known electric drives are largely optimized for their respective tasks and, with regard to specific requirements, are very suitable for providing particularly high drive torques and relatively high drive powers. For this reason, it is generally desirable to maintain or improve the overall technical efficiency, essentially the effectiveness, of the electric drive.

[0004] However, in particular when the described electric drive is operated for a relatively long time and provides a relatively high drive torque and a relatively high drive power, the drive components contained in the electric drive may heat up.

[0005] Heating of the electric drive therefore has various causes and can be traced back, for example, to the ohmic resistance of the coil assembly, magnetic reversal effects within the electric drive, eddy current losses or bearing friction.

[0006] In any case, heating of an electric drive of this type generally results in drive components of the electric drive, such as drive bearings or insulation of coil arrangements, having to withstand relatively strong thermal stresses, so that the electric drive as a whole is also subjected to relatively high stresses from a thermal point of view.

[0007] Due to thermal stresses, the efficiency of the electric drive can be significantly reduced, especially when considered during the life / service life of the electric drive, which is relatively high, for example due to a higher current consumption or due to higher bearing friction. Due to, for example, thermal wear of the drive components of the electric drive, the mentioned life / service life can be further shortened overall.

[0008] Even though known electric drives have a heat exchanger unit for overcoming thermal problems, for example reference should be made to the water jacket cooling unit described in document DE 10 2005 052 363 A1, it is desirable to further reduce the thermal stresses of the electric drive in order to specifically further increase the life / service life of the electric drive so that, for example, a more durable drive can be provided. Summary of the invention

[0009] With this in mind, it is an object of the present invention to provide an improved or at least different embodiment of an electric drive.

[0010] Furthermore, the invention is directed to a method for producing a heat exchanger unit, in particular a heat exchanger unit for use in an electric drive of this type.

[0011] In the case of the present invention, said object is solved in particular by one aspect of the invention.An advantageous embodiment is a further aspect of the present invention.

[0012] The basic idea of ​​the invention is based on innovative considerations to similarly increase the cooling power of heat exchanger units known from the prior art. While known heat exchanger units usually focus on utilizing the heat loss energy generated during operation of the electric drive at or near the stator housing, the invention proposes to utilize the heat loss energy in the immediate vicinity, thus quasi directly, at the drive component of the electric drive responsible for the heat loss energy. The component of the proposed heat exchanger unit that dissipates the heat loss energy thus abuts in the immediate vicinity and specifically in a gap-free manner on the drive component of the electric drive responsible for the heat loss energy, thereby in this way eliminating unnecessary space between these components.

[0013] In order to realize this idea, it is provided that an electric drive device, which can be used, for example, in the field of motor vehicle technology, is equipped with an electric motor having a stator assembly and an armature assembly. The electric drive device also has a housing cover and a housing, which can be closed by the housing cover and is used to accommodate the stator assembly. The housing cover and the housing are made of a metal material, for example, or less frequently of a plastic material. In any case, the housing cover covers the housing in order to protect, for example, the drive components arranged in the housing as described below from environmental influences.

[0014] The rotor shaft is arranged at the housing, the rotor axis defining a longitudinal rotation axis along its preferably cylindrical rotor body. The rotor shaft is firmly fixed to the housing and is in particular formed integrally with the housing. The rotor shaft can advantageously engage with the housing cover, for example via a bearing and / or a fixing assembly arranged at the housing cover.

[0015] A rotor arranged to be rotatable about a longitudinal rotation axis is provided at a rotor shaft to accommodate an armature assembly. The rotor may have, for example, a pot-like shape and may define a pot receiving portion to support a receiving portion and / or a fixing portion of the armature assembly. The armature assembly includes, for example, a permanent magnet assembly.

[0016] It goes without saying that the invention can also be applied to electric motors whose armature and stator assemblies are similarly arranged to be interchangeable, thus to electric motors whose armature assemblies are arranged at the housing and whose stator assemblies are arranged at the rotor. In other words, the invention can be applied to both internal and external rotor electric motors.

[0017] The stator assembly comprises one or more stator drives, each of which is arranged at a fitting part of the stator assembly. The stator drives extend along a longitudinal axis of rotation. The individual stator drives form the stator assembly as a whole and, for example, each comprise a coil winding assembly. The stator drives can be operated individually or collectively by the electric motor control unit.

[0018] Furthermore, the stator assembly comprises one or more duct guide sections which are advantageously arranged between the equipment sections. The duct guide sections similarly form a free gap between two adjacent equipment sections. The duct guide sections and the equipment sections are arranged, for example, relative to one another so as to alternate with one another in an alignment direction, wherein the alignment direction can in particular be defined by a circumferential direction oriented transversely or orthogonally to the longitudinal rotation axis.

[0019] It is important that the electric drive comprises a heat exchanger unit for exchanging heat loss energy between the stator assembly and / or the armature assembly on the one hand and a heat exchanger fluid on the other hand. Advantageously, the heat exchanger fluid is water or a water-glycol mixture, which similarly acts as a heat transfer medium.

[0020] The heat exchanger unit further comprises a fluid conduit system through which the heat exchanger fluid can flow and which has at least one fluid conduit or a group of fluid conduits which extend, in particular longitudinally or parallel to the longitudinal axis of rotation, in particular partially or completely through the stator assembly. Thereby, each fluid conduit abuts by contact without gap on at least one stator drive jacket surface of the stator drive which is oriented transversely or radially with respect to the longitudinal axis of rotation.

[0021] This design has the surprising effect that the heat loss energy occurs almost entirely via heat transfer (heat conduction) and therefore only partially or almost not at all via heat convection. This has the advantage that the heat loss energy provided in the drive device can be transferred relatively quickly to the heat exchanger fluid and can then be dissipated from the electric drive device, for example to a heat exchanger fluid cooler. This further has the advantage that a drive device equipped with the proposed heat exchanger assembly can achieve a relatively high service life.

[0022] The electric drive can therefore be kept relatively cool compared to conventional electric drives, so that the thermal balance of the electric drive is also optimized, as it were.

[0023] Advantageously, the electric drive is equipped with a fluid line which is advantageously made of a plastic material, in particular a thermoplastic material.

[0024] Each or at least one fluid conduit abuts against one of the stator drive jacket surfaces in a planar manner or over the entire area and / or without gaps by contact. This has the effect that there is no unnecessary intermediate gap between the fluid conduit or the fluid jacket surface of the fluid conduit and the stator drive or the stator drive jacket surface, which is filled with air, for example. Since the heat loss energy that necessarily occurs in the stator drive during operation of the electric drive can be dissipated directly, and not as before, in particular by heat convection, the heat transfer, in particular heat conduction, from the stator drive to the fluid conduit through which the heat exchanger fluid flows is improved. It is thereby achieved that the heat loss energy can be conducted relatively quickly from the stator drive to the heat exchanger fluid, so that the electric drive as a whole remains relatively cool even if the electric drive provides high drive torques and high drive powers during operation. In addition, it has the advantage that the drive components of the electric drive are subjected to less thermal stress, so that the service life / service life of an electric drive equipped with a heat exchanger unit of this type is significantly increased.

[0025] In order to achieve that the heat loss energy can be conducted even faster from the stator drive to the heat exchanger fluid, it is preferred that one or each fluid duct abuts in a planar manner or over the entire area and / or without gaps on at least one stator drive jacket surface circumferential portion of one of the stator drive jacket surfaces. One or each stator drive jacket surface circumferential portion is arranged in a boundary-like manner between the equipment part on the one hand and the duct guide part on the other hand, the stator drive jacket surface circumferential portions oriented in the circumferential direction about the longitudinal axis of rotation advantageously each having a surface normal.

[0026] This is particularly advantageous when the fluid conduit cross section of the or each fluid conduit corresponds in area to the cross section of the conduit guide section, since the entire available area between the two equipment parts with the stator drive can then be used by the fluid conduit for guiding the heat exchanger fluid. Thus, the electric drive can be cooled even more effectively.

[0027] Each stator drive jacket surface or each stator drive jacket surface circumferential portion of the stator drive is preferably formed by a coil winding surface. The coil winding surface can be formed by a coil winding assembly arranged at the corresponding equipment part, wherein the coil winding assembly is advantageously formed by a plurality of coil windings, which are particularly oriented transversely or along the longitudinal rotation axis.

[0028] Advantageously, the coil winding surface of the coil winding assembly undulates continuously and has a coil surface profile consisting of arcuate portions of an arc shape merging into each other at an acute angle parallel to the longitudinal rotation axis or transversely to the longitudinal rotation axis. Thereby, the first set of fluid conduits is advantageously applied to the coil surface profile of the coil winding assembly in a gapless complementary manner so that the first set of fluid conduits forms a negative coil surface profile that looks like, for example, a sawtooth profile.

[0029] The fluid conduits each preferably extend partially or completely through the stator assembly or a conduit guiding portion of the stator assembly in the direction of the longitudinal rotation axis, so that they each have a relatively long length.

[0030] It is possible that a plurality of conduit guide sections and a plurality of equipment sections are arranged alternately in the circumferential direction around the longitudinal axis of rotation, wherein each conduit guide section has a fluid conduit and each equipment section has a stator drive. Thus, the individual stator drives are similarly separated from one another on both sides in the circumferential direction by the conduit guide sections.

[0031] Since the fluid ducts are each arranged in the duct guide portion, the stator drive device located therebetween can be cooled from both sides so that heat loss energy can be dissipated from both sides and can be supplied to the heat exchanger fluid flowing through the fluid ducts.

[0032] It is generally conceivable that two or more fluid conduits are each arranged in a conduit guide part, which two or more fluid conduits rest against one another and against the equipment part in a planar manner.

[0033] In addition, the fluid conduit system also includes at least one fluid inlet hole and at least one fluid outlet hole through which the heat exchanger fluid can flow into the at least one fluid conduit. This has the effect that the heat exchanger fluid can be supplied to the fluid conduit system of the heat exchanger unit. For example, a supply unit or the like is suitable for supplying the heat exchanger fluid. In any case, the supply unit can be connected to the fluid inlet hole and / or the fluid outlet hole, for example, by a supply hose, so that the heat exchanger fluid can be pumped into the fluid conduit system of the heat exchanger unit, for example, starting from the supply unit. Therefore, the heat exchanger fluid can flow through the electric drive. The supply unit can then advantageously be connected to a cooling unit, for example, to another heat exchanger unit, which cools the heated heat exchanger fluid.

[0034] Preferably, the fluid reservoirs are each arranged between a fluid inlet opening of the fluid conduit system and at least one fluid conduit and / or between a fluid outlet opening of the fluid conduit system and at least one fluid conduit. In the context of the present specification, the term fluid reservoir refers to a fluid supply that forms a heat exchanger fluid storage. In other words, a predetermined or predeterminable fluid volume, in particular a heat exchanger fluid volume, can be temporarily stored in the fluid conduit system by one or more fluid reservoirs to compensate for inconsistent supplies, for example on the part of the supply unit. This has the advantage that the fluid conduit system and / or the heat exchanger unit is supplied with heat exchanger fluid in any case, so that cooling of the electric drive can be ensured.

[0035] This is preferred when the fluid conduit comprises an inlet conduit and a return conduit, which can each be made of a plastic material, in particular a thermoplastic material.

[0036] Thus, the inlet duct and the return duct may each have the shape of a hollow cylinder and may have an annular, circular, elliptical or polygonal cross section based on the main expansion direction. The inlet duct and the return duct may each be formed by a thin-walled pipe body. In this case, reference will also be made below to a first group of fluid ducts and a second group of fluid ducts, wherein the first group of fluid ducts is defined by the inlet duct and the second group of fluid ducts is defined by the return duct, or vice versa.

[0037] During operation of the electric drive, one or more inlet ducts may be arranged at the first duct flange and one or more return ducts may be arranged at the second duct flange, each at an angle, in particular at a right angle. Conveniently, the inlet duct and the return duct are thus arranged at the respective duct flanges spaced apart from each other along an imaginary duct flange ring, which is arranged at the respective duct flanges.

[0038] It is further provided that during operation of the electric drive, the return conduit arranged at the second conduit flange is inserted or plugged into the inlet conduit arranged at the first conduit flange. The fluid conduit annular cavity through which the heat exchanger fluid can flow extends in the direction of the longitudinal rotation axis and defines a fluid reservoir, and an overflow chamber is thus each formed between the inlet conduit and the return conduit. The overflow chamber allows the heat exchanger fluid to flow from the inlet conduit into the return conduit, wherein the inlet conduit and the return conduit are similarly open to the overflow chamber so that the heat exchanger fluid flowing in through the inlet conduit can overflow into the return conduit through the overflow chamber. Due to the overflow chamber, a predetermined or predeterminable heat exchanger fluid volume can be temporarily stored.

[0039] The inlet duct advantageously defines a longitudinal inlet axis and the return duct defines a longitudinal return axis, wherein during operation of the electric drive the longitudinal inlet axis and the longitudinal return axis are arranged almost parallel to each other, or parallel and in particular coaxially.

[0040] In any case, the fluid reservoirs may each be arranged between a fluid inlet opening and an inlet conduit of the fluid conduit system, and / or between a fluid outlet opening and a return conduit of the fluid conduit system.

[0041] Advantageously, the conduit flange is preferably made of a plastic material, in particular a thermoplastic material, advantageously of the same material as the fluid conduit.

[0042] During operation of the drive device, the first and second conduit flanges can abut against each other by contact, in particular by a substance-to-substance bond, in a non-positive fit or positive fit manner, wherein the fluid reservoir is formed between the first and second conduit flanges.

[0043] The invention comprises a further basic idea: a method for producing a heat exchanger unit, in particular for use in an electric drive, is specified as described above.

[0044] To this end, the proposed manufacturing method comprises a plurality of steps, namely according to a first step, a first group of fluid conduit blanks made of a plastic material, in particular a thermoplastic material, is inserted into a stator assembly of an electric drive device. Thus, the first group of fluid conduit blanks comprises at least one or more fluid conduit blanks, which are, for example, hollow cylindrical raw plastic bodies having a circular, elliptical or polygonal cross-section based on the main expansion direction. In any case, the fluid conduit blanks are preferably inserted into free conduit guide portions of the stator assembly. The conduit guide portions are advantageously arranged between the equipment portions to accommodate the stator drive device of the stator assembly; therefore, they delimit the equipment portions from each other at least in the circumferential direction. The conduit guide portions and the equipment portions can, for example, be arranged relative to each other so as to alternate with each other in the circumferential direction around the longitudinal axis of rotation of the rotor body.

[0045] It is conceivable that, for example, all of the first group of fluid conduit blanks are inserted or pushed together into the free conduit guide section, wherein they first abut, for example, against one or two equipment parts, which separate the conduit guide sections from one another in a point-shaped or line-shaped manner. This has the effect that, for example, as part of an automated insertion process, the fluid conduit blanks can be arranged relatively easily at the stator assembly.

[0046] According to a second step, it is provided that the first group of fluid conduit blanks are heated. Advantageously, the heating is carried out until the fluid conduit blanks are each heated above their respective glass transition temperature. Thus, the glass transition temperature can vary widely based entirely on the plastic material used, in particular in the case of thermoplastic materials. For example, for partially crystalline thermoplastics, a glass transition temperature range of about -50°C to about 150°C is known. For example, for non-crystalline thermoplastics, a glass transition temperature range of about 80°C to about 225°C is further known. For example, for non-crystalline thermoplastics, a glass transition temperature range of about 80°C to about 225°C is further known. Other glass transition temperatures are, for example, 47°C to 258°C for polyamide 66 (PA66), 60°C to 220°C for polyamide 6 (PA6), and 0°C to 165°C for polypropylene (PP).

[0047] In any case, the purpose of the method is to make a first group of fluid conduit blanks made of plastic material soft and formable so that a pressurization, in particular internal pressurization, of the first group of fluid conduit blanks can be carried out in a subsequent step. Since the first group of fluid conduit blanks are heated and therefore relatively soft and formable, as part of the pressurization, they each widen radially or laterally relative to their main expansion direction. When comparing the fluid conduit cross-section of one or each of the first group of fluid conduit blanks before heating and pressurization with internal pressure, which is oriented transversely relative to the main expansion direction of the fluid conduit blank, with the fluid conduit cross-section of one or each of the first group of fluid conduit blanks after heating and pressurization with internal pressure, it can be determined that the corresponding fluid conduit cross-sections have been similarly increased in terms of area size.

[0048] Advantageously, the fluid conduit cross section of the fluid conduit blank completely fills the corresponding cross section of the conduit guiding portion, so that the fluid conduit cross section is almost the same as or identical to the corresponding cross section of the conduit guiding portion.

[0049] In a further step, it can be further provided that the pressurization of the first group of fluid conduit blanks is maintained for a predetermined or predeterminable period of time. It is thereby achieved that the first group of fluid conduit blanks can be widened radially to the maximum extent, whereby the fluid conduit blank jacket surface of the first group of fluid conduit blanks can be applied to the stator drive jacket surface of the stator drive of the stator assembly by planar contact and advantageously in a gap-free manner and advantageously by completely planar contact.

[0050] According to the fifth step, a cooling process is provided, as part of which the first set of fluid conduit blanks are cooled. For example, during this step, internal pressure can be maintained in the first set of fluid conduit blanks. The advantage obtained thereby is that the first set of fluid conduit blanks will not spring back to their original shape.

[0051] In a sixth step, it is further provided that a first duct flange is injection molded onto the first group of fluid duct blanks, which are now completely or at least partially cooled and can now also be identified as the first group of fluid ducts, or just simply as fluid ducts. The first duct flange also consists, for example, of a plastic material, for example of the same plastic material as the first group of fluid duct blanks, preferably of a thermoplastic material. Thus, an integral first duct flange fluid duct component is similarly formed at the stator assembly.

[0052] After arranging the first conduit flange to the first group of fluid conduit blanks, as part of a seventh step, provision is made for providing a second group of fluid conduit blanks, the second group of fluid conduit blanks each having a smaller cross section than the first group of fluid conduit blanks.

[0053] The second group of fluid conduit blanks is also made of plastic material, in particular thermoplastic material. Like the first group of fluid conduit blanks, the second group of fluid conduit blanks also includes at least one or more fluid conduit blanks, each of which has a hollow cylindrical raw plastic body with a circular, elliptical or polygonal cross section based on the corresponding main expansion direction.

[0054] The second group of fluid conduit blanks are further arranged at the second conduit flange, which is also made of plastic material, especially thermoplastic material. The second group of fluid conduit blanks are selected to be arranged at the second conduit flange so that the second group of fluid conduit blanks can be inserted or inserted into the first group of fluid conduit blanks.

[0055] It should also be mentioned that the arrangement of the fluid conduit blank at the respective conduit flange can optionally be non-positive-fit, positive-fit or by means of a substance-to-substance bond.

[0056] After the second group of fluid conduit blanks are arranged at the second conduit flange, they similarly form an integrated second conduit flange fluid conduit component that can be inserted into the first conduit flange fluid conduit component. The conduit flange fluid conduit components can thus be arranged relative to each other so that the second group of fluid conduit blanks protrude circumferentially into the first group of fluid conduit blanks at a certain distance. Thus, the two conduit flanges are advantageously abutted against each other by contact and are connected to each other in a non-positive fit manner, in a positive fit manner or by a combination of material and material.

[0057] In a final step, provision is made for the two conduit flanges to be fixed to one another in a detachable or non-detachable manner.

[0058] Due to the described production method, the advantage is achieved that the proposed electric drive and / or the proposed heat exchanger unit can be produced relatively cost-effectively, for example as part of automated production.

[0059] It goes without saying that the fluid conduits can be an integral part of the conduit flange and can thus likewise be formed integrally with the conduit flange so that the fluid conduit flange part is formed integrally. It can advantageously be provided that the fluid conduits are each designed as a separate part.

[0060] In summary, it should be noted that the present invention preferably relates to an electric drive device, comprising an electric motor having a stator assembly and an armature assembly, wherein the stator assembly comprises one or more equipped parts extending along the longitudinal rotation axis, equipped with a stator drive device, and one or more conduit guide parts extending along the longitudinal rotation axis. The drive device also comprises a heat exchanger unit for exchanging heat loss energy between the stator assembly and / or the armature assembly on the one hand and a heat exchanger fluid on the other hand, wherein the heat exchanger unit comprises a fluid conduit system, through which the heat exchanger fluid can flow, and which has at least one fluid conduit. Thereby, the fluid conduits extend longitudinally through the stator assembly, wherein each fluid conduit abuts by contact against at least one stator drive device jacket surface of the stator drive device.

[0061] Further important features and advantages of the invention emerge from the further aspects of the invention, from the drawings and from the corresponding figure description based on the drawings.

[0062] It goes without saying that the features mentioned above and the features yet to be explained below can be used not only in the respectively specified combination but also in other combinations or alone, without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Preferred exemplary embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, whereby the same reference numerals refer to the same or similar or functionally identical components.

[0064] Indicatively, in each case,

[0065] Figure 1 shows a longitudinal section of a preferred electric drive,

[0066] Figure 2 Show Figure 1 A cross section of the electric drive device according to the section line II-II indicated by the dashed line,

[0067] Figure 3 A perspective view showing a heat exchanger unit arranged at a stator assembly of an electric drive,

[0068] Figure 4 Show Figure 3 A perspective view of a heat exchanger unit of FIG. 1 with the stator assembly removed to make the heat exchanger unit visible,

[0069] Figure 5 Show Figure 4 sectional view of a heat exchanger unit according to the section indicated by arrow VV, wherein only the upper half of the heat exchanger unit is shown in an enlarged manner for the sake of visibility,

[0070] Figure 6 Show Figure 5 A cross-sectional view of a heat exchanger unit, but in an exploded state,

[0071] Figure 7 Shown in accordance with Figure 4 The arrows VII are arranged relative to each other in the perspective view Figure 4 The two conduit flanges are provided with no fluid conduits arranged thereon.

[0072] Figure 8 and Fig. 9 Each is shown in perspective view according to Figure 6 Arrows VIII and IX Figure 4 A single conduit flange. DETAILED DESCRIPTION

[0073] Figures 1 to 9 A preferred embodiment of an electric drive device 10 is shown, which includes at least one electric motor 11 having a stator assembly 20 and an armature assembly 42 .

[0074] The stator assembly 20 is arranged in a housing 21, which is used to accommodate the stator assembly 20. The housing 21 can be closed, in particular in a fluid-tight manner, for example, by a housing cover 22. Thus, for example, the inner workings of the electric motor 11 can be protected from environmental influences, etc., so that an overall relatively durable electric drive device 10 can be provided.

[0075] The drive device 10, in particular the electric drive device 10, is preferably used in the field of motor vehicle technology or other technical fields to provide a drive torque and a drive motion. For example, a drive device 10 of this type is usually used to drive an actuator, which is not shown in the figure. The actuator can be a valve, a wastegate valve, a throttle valve or even a wiper.

[0076] The housing 21 advantageously has a pot-like shape and defines a pot receptacle 23 for accommodating the stator assembly 20. The housing 21 has, for example, a housing bottom 24 and a housing wall 25, wherein the housing bottom 24 and the housing wall 25 can each be made, for example, of a metal material or a plastic material. In any case, the housing bottom 24 has, for example, a housing bottom rear surface 26 and a housing bottom front surface 27 oriented relative to the housing bottom rear surface 26, wherein the housing bottom rear surface 26 and the housing bottom front side 27 are in particular two large areas aligned parallel to each other.

[0077] The housing bottom 24 also has a housing bottom jacket surface 28 that radially separates it from the outside. In addition, the housing bottom 24 preferably has a cylindrical shape, so that the housing bottom rear surface 26 and the housing bottom front side 27 form a cylinder, which can advantageously have a circular, elliptical or polygonal shape.

[0078] The housing bottom rear surface 26 and the housing bottom front side 27 may be large areas that are circular, oval, or polygonal.

[0079] In any case, the described housing wall 25 extends away from the housing bottom 24 so that the pot receptacle 23 is formed between the housing bottom 24 and the housing wall 25 , preferably between a housing wall inner jacket surface 30 of the housing wall 25 and a housing bottom front side 27 of the housing bottom 24 .

[0080] In a further advantageous manner, the housing wall 25 has a housing wall outer jacket surface 31 which separates it from the outside in the radial direction. The housing wall 25 is closed to the top by forming a housing wall front surface 32 .

[0081] As in Figure 1As can be seen in the figure, the circular, elliptical or polygonal cylindrical housing 21 defines a longitudinal housing axis 29, with the housing wall 25 and / or the housing wall inner jacket surface 30 preferably being equidistant relative to said longitudinal housing axis 29. In this context, it is also possible and advantageous when the housing wall outer jacket surface 31 is arranged parallel to the longitudinal housing axis 29, and when the housing bottom rear surface 26 and the housing bottom front surface 27 are oriented orthogonally relative to the longitudinal housing axis 29. In this way, an advantageous pot-shaped housing 21 for accommodating the stator assembly 20 can be provided.

[0082] In any case, it is conceivable that the housing wall front surface 32 serves to accommodate the mentioned housing cover 22 , for which purpose, for example, additional fastening means and / or sealing means (not shown in the figures) can be provided.

[0083] For example, the housing cover 22 is made of a metal material or a plastic material, for example, the same material as the housing 21 .

[0084] The rotor shaft 40 can be arranged on the housing 21, in particular on the housing wall 25. The rotor shaft 40 is preferably arranged in a fixed manner on the housing 21 or on the housing wall 25 and defines a longitudinal rotation axis 12 along its main extension direction. This is advantageous in this context, for example, and in particular according to Figure 1 It can be seen that the longitudinal rotation axis 12 and the longitudinal housing axis 29 are arranged approximately parallel and in particular coaxially.

[0085] The rotor shaft 40 is, for example, a cylinder including a circular cross-section, and is preferably made of a plastic material or a metal material.

[0086] In any case, the rotor shaft 40 serves the purpose of accommodating the rotor 41 in such a way that the rotor 41 is supported at the rotor shaft 40 so as to be rotatable about the longitudinal rotation axis 12. For example, the rotor 41 has a corresponding bearing body 52 or rotor bearing 52 which is not shown in the figures.

[0087] It should also be mentioned in this context that the rotor shaft 40 advantageously protrudes through the housing cover 22 through the housing cover opening identified with reference numeral 19 so as to similarly extend beyond the housing cover front side 18 defining a large area. It is conceivable, for example, that an actuator fastening device engages with a rotor portion 17 of the rotor shaft 40, which extends beyond the housing cover front side 18.

[0088] In any case, the rotor 41 serves the purpose of permanently housing the armature assembly 42, wherein the armature assembly 42 is composed of Figure 1 and Figure 2The armature assembly cooperates with the stator assembly 20 to provide driving torque and driving power, with the permanent magnet 43 indicated by the cross-hatching in FIG.

[0089] In the same manner as the housing 21 , the rotor 41 has, for example, a pot-like shape and advantageously a cylindrical shape. The rotor has a longitudinal rotor axis 50 and has a circular, elliptical or polygonal cross section based on the longitudinal rotor axis 50 .

[0090] The rotor 41 defines a rotor bottom 44 from which a rotor wall 45 extends, in particular orthogonally. For example, the rotor wall 45 is oriented parallel and the rotor bottom 44 is oriented orthogonally with respect to a longitudinal rotor axis 50. The longitudinal rotor axis 50 is further arranged, in particular coaxially parallel to the longitudinal rotation axis 12.

[0091] The rotor 41 further defines a rotor receiving portion 51, which may also be referred to as a rotor receiving space, particularly between the rotor bottom 44 and the rotor wall 45. The armature assembly 42 or the permanent magnet assembly 43 or the permanent magnet 43 is arranged in the rotor receiving portion 51 accordingly.

[0092] As mentioned above, the stator assembly 20 is arranged in the housing 21, wherein the stator assembly 20 is fastened to the housing 21, for example by fastening means not shown, such as fastening screws or adhesive. It is also conceivable that the housing 21 and the stator assembly 20 are made in one piece.

[0093] In any case, the stator assembly 20 defines one or more equipment portions 60 extending along the longitudinal rotation axis 12 and each of which serves the purpose of equipping a stator drive 61 of the stator assembly 20. In addition, the stator assembly 20 also defines one or more free conduit guide portions 62 extending along the longitudinal rotation axis 12.

[0094] The stator drive 61 similarly forms a driving component of the electric drive 10, which cooperates with the armature assembly 42 to provide the drive torque and drive power of the electric drive 10. Each stator drive 61 has a stator drive jacket surface 63 formed by a coil winding assembly 65, which is arranged at the corresponding equipment part 60, wherein the coil winding assembly 65 advantageously includes a plurality of coil windings oriented transversely to the longitudinal rotation axis 12.

[0095] Typically, the stator drive 61 or the stator 20, respectively, can be controlled or regulated by the electric motor control unit 200. For example, lines 201, 202 are provided for this purpose, which electrically connect the stator drive 61 or the stator 20, respectively, to the electric motor control unit 200.

[0096] For example, in Figure 2 , the stator assembly 20 is divided into a plurality of equipment parts 60 and a plurality of conduit guide parts 62 which are arranged to alternate in a cyclic manner around the longitudinal rotation axis 12 in the circumferential direction 13. The equipment parts 60 and the conduit guide parts 62 thus abut against each other by contact without any gap, so that they form a tightly coupled gapless circle.

[0097] The electric drive device has a heat exchanger unit 70 for cooling the electric drive device 10, wherein the heat exchanger unit 70 defines a fluid conduit system 71 through which a heat exchanger fluid can flow. The fluid conduit system 71 in turn consists of at least one fluid conduit 72 into which the heat exchanger fluid can flow via at least one fluid inlet opening 75 and the heat exchanger fluid can flow out via at least one fluid outlet opening 76, which can be, for example, Figure 3 and Figure 4 Seen in.

[0098] according to Figure 1 It can be seen that a not shown supply unit for supplying heat exchanger fluid is connected to the heat exchanger unit 70 via a supply hose 203 .

[0099] exist Figure 3 , it can be seen that a plurality of fluid ducts 72 of the fluid duct system 71 extend through the stator assembly 20, in particular along the longitudinal rotation axis 12, which is shown here in dashed lines. Thus, each fluid duct 72 abuts in a planar contact manner on at least one stator drive 61 or on its stator drive jacket surface 63, in particular on the coil winding 65.

[0100] exist Figure 2 It can also be seen that the fluid conduit 72 arranged in the equipment part 60 abuts in a planar manner or over the entire area on the stator drive jacket surface 63, which is shown in the present case by a plurality of dashed lines. Furthermore, the fluid conduit blank 73 is located in each of the illustrated cases in the equipment part 60 when the equipment part 60 is inserted into the stator assembly 20 as part of the production method of the heat exchanger unit 70. It can be clearly seen from this that, unlike the fluid conduit 72, the fluid conduit blank 73 abuts only at certain points on the stator drive 61 or its stator drive jacket surface 63, respectively.

[0101] In any case, the stator drive device jacket surface 63, for example, defines one or more stator drive device jacket surface circumferential portions 66, each of which is arranged in a sandwich-like manner in the circumferential direction 13 between the equipment part 60 or the stator drive device 61 and the catheter guide part 62, similarly serving as a boundary between the equipment part 60 or the stator drive device 61 and the catheter guide part 62.

[0102] It should be mentioned in this context that the fluid conduit 72 is advantageously applied in a planar manner or over the entire area and / or without gaps to the stator drive jacket surface circumferential portion 66. This has the advantage that heat loss energy can be transferred relatively quickly from the stator drive 61 to the heat exchanger fluid, which flows through the fluid conduit 72.

[0103] For example, Figure 2 The dashed lines 74 in the figure indicate that the fluid ducts 72 each have a fluid duct cross section 74 which is oriented transversely to the longitudinal rotation axis 12. The fluid duct cross section 74 is thus advantageously designed such that it corresponds to the cross section 67 of the duct guide portion 62, thereby occupying the largest possible area between two stator drives 61 adjacent in the circumferential direction 12.

[0104] Each fluid conduit 72 may have an inlet conduit 80 and a return conduit 90, as in Figure 5 and Figure 6 It can be seen that the two ducts 80 , 90 are, for example, hollow cylindrical and have a circular, elliptical or polygonal cross section relative to their main expansion direction.

[0105] The inlet duct 80 and the return duct 90 are advantageously arranged, for example, at Figures 3 to 6 1 , 102. It is thus proposed to arrange the inlet duct 80 at the first duct flange 101 and the return duct 90 at the second duct flange 102.

[0106] Each conduit flange 101, 102 is generally an annular flat body 103, which can be made of, for example, a plastic material or a metal material. The flat body 103 has an outer shape, for example, a circular, oval or polygonal shape.

[0107] Each flat body 103 has a front large side 104 and a rear large side 105 oriented oppositely. Towards the side, the flat body 103 is closed by an outer narrow side 106. The flat body 103 also has a central recess 107 which passes completely through the flat body 103 and is, for example, a central recess 107 arranged in the center of the flat body 103. However, it is conceivable that the central recess 107 is, for example, arranged eccentrically at the flat body 103. In any case, the flat body 103 has an inner narrow side 111 oriented inwardly toward the central recess 107.

[0108] Each flat body 103 has a catheter flange fastening assembly 112 including a set of catheter flange fastening recesses 113, which advantageously completely penetrate the flat body 103 and are used to mutually fasten the flat bodies 103. The catheter flange fastening recesses 113 are arranged annularly and equidistantly from each other in the circumferential direction around the flat body 103, for example along an imaginary circular line (not shown in the figure).

[0109] Each flat body 103 also has a fluid conduit recess assembly 108 comprising a set of fluid conduit recesses 114, which advantageously pass completely through the flat body 103 and are used to arrange, in particular to insert, the fluid conduit 72. The fluid conduit recesses 114 are arranged equidistantly from one another in the circumferential direction around the flat body 103 along an imaginary circular line (not shown in the figures).

[0110] At least one flat body 103 has an annular recess 109 which is arranged on the rear large side 105 and is introduced into the flat body 103 and does not pass completely through the flat body 103, for example only through half of the flat body 103. The flat body 103 thus similarly has two stepped large areas separated from each other.

[0111] In any case, the fluid conduits 72, in particular the inlet conduits 80 or the return conduits 90, can each be inserted into the fluid conduit recesses 114. This is advantageous when one or more inlet conduits 80 are arranged at the first conduit flange 101, for example, inserted into the fluid conduit recesses 114. The one or more return conduits 90 inserted into the fluid conduit recesses 114 can then be arranged at the second conduit flange 102. For example, the inlet conduits 80 and the return conduits 90 are arranged orthogonally to the conduit flanges 101, 102 so that they extend away from the conduit flanges 101, 102 in a similar finger-like manner. This can be, for example, Figure 5 and Figure 6 It can be seen in.

[0112] During operation of the electric drive device 10, the conduit flanges 101, 102 supporting the inlet conduit 80 and the return conduit 90 are arranged against each other by contact, that is, in such a way that the inlet conduit 80 is arranged in the return conduit 90 or vice versa. Therefore, a fluid conduit annular cavity 115 and an overflow chamber 116 are each formed between the inlet conduit 80 and the return conduit 90. In addition, at least one fluid reservoir 110 is each formed between the two conduit flanges 101, 102 that abut against each other by contact. The fluid reservoir 110 is advantageously formed between the front large side 104 of the conduit body 101, 102 and the rear large side 105 of the other conduit flange 101, 102, wherein, for example, the fluid reservoir 110 is formed by an annular recess 109 arranged at the rear large side 105.

[0113] Thus, it is advantageous when the inlet duct 80 has a longitudinal inlet axis 81 and the return duct 90 has a longitudinal return axis 91. The longitudinal inlet axis 81 and the longitudinal return axis 91 are arranged parallel to each other, as for example in Figure 5 However, this is advantageous when the longitudinal inlet axis 81 and the longitudinal return axis 91 are oriented coaxially to one another and parallel to the longitudinal axis of rotation 12 .

Claims

1. A method for manufacturing a heat exchanger unit (70), wherein the heat exchanger unit is a heat exchanger unit used in an electric drive device (10), wherein the electric drive device (10) comprises: A heat exchanger unit (70) comprising a fluid conduit system (71) through which a heat exchanger fluid can flow, the fluid conduit system (71) comprising at least one fluid conduit (72) manufactured by: 1) inserting a first set of fluid conduit blanks made of plastic material into a free conduit guide portion (62) of a stator assembly (20) of the electric drive device (10), 2) heating the first group of fluid conduit blanks until each fluid conduit blank is heated above a corresponding glass transition temperature, 3) pressurizing the first group of fluid conduit blanks using internal pressure so that the fluid conduit blanks are widened transversely with respect to their main extension direction, 4) maintaining the internal pressure in the first group of fluid conduit blanks until one or all of the first group of fluid conduit blanks abut against a stator drive device jacket surface (63) of a stator drive device (61) of the stator assembly (20) in a planar manner by contact, 5) cooling the first group of fluid conduit blanks, 6) injection molding a conduit flange (101) onto the first group of fluid conduit blanks, 7) inserting a second group of fluid conduit blanks, which are designed to have a smaller cross-section than the first group of fluid conduit blanks and are arranged at another conduit flange (102) so that the second group of fluid conduit blanks protrude into the first group of fluid conduit blanks and the two conduit flanges (101, 102) abut against each other by contact, 8) Fixing the two conduit flanges (101, 102) to each other.

2. The manufacturing method according to claim 1, wherein a first set of fluid conduit blanks made of thermoplastic are inserted into a free conduit guide portion (62) of a stator assembly (20) of the electric drive device (10).

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