CN117394573A - Electrical machine with motor housing and customer connection flange - Google Patents

Abstract

An electric machine (12) having a stator base body (34) with an annular yoke region (13) and radial stator teeth (14) arranged at the yoke region for receiving an electric winding (20), wherein the stator base body (34) is inserted into a cylindrical motor housing (15) such that the yoke region (13) is supported radially on an inner side (16) of the motor housing (15) and a customer connection flange (50) is arranged axially adjacent to the motor housing (15), and at least one decoupling element (44) is inserted between the customer connection flange (50) and the motor housing (15), by means of which decoupling element the customer connection flange (50) is fastened to the motor housing (15) in a mechanically vibration-damping manner.

Description

Electrical machine with motor housing and customer connection flange

Technical Field

The present invention relates to an electric machine with a motor housing and a customer connection flange according to the preamble of the independent claim.

Background

DE 20 2020 102 442 U1 shows a stator of an electric motor, wherein clamping elements are arranged at the stator base body in order to radially and axially tighten the stator base body in the stator housing. The clamping element is in this case formed as a press-bent part which engages in an axial recess at the radially outer periphery of the stator base body. In such embodiments, the vibration excitation of the stator base towards the stator housing is decoupled relatively well, however, a number of individual components have to be assembled. Furthermore, the thermal contact of the stator base body with respect to the stator housing is comparatively small due to the comparatively small contact area, so that heat can be dissipated poorly from the electrical winding. These drawbacks should be overcome by the solution according to the invention.

Disclosure of Invention

The invention has the advantages.

The device according to the invention with the features of the independent claim has the advantage in comparison with this that byThe arrangement of the decoupling element between the motor housing and the customer's joint flange enables a very good thermally conductive transition between the stator base body and the motor housing. Thereby allowing the stator to radiate heat well. Solid sound transmission from the stator base body to the motor housing) The decoupling element can reliably buffer against the customer connection flange. Standard manufacturing processes can thereby be used for the motor manufacture of the stator and rotor, and subsequently mechanical decoupling structures are added between the motor housing and the customer joint flange. By means of a modification of the interface for the customer flange with the decoupling element, the standardized electric motor can thus be adapted very easily to the requirements regarding vibration damping and heat dissipation. In such an embodiment, not only vibrations excited by the magnetic circuit are damped, but also other vibrations, such as occur, for example, by the rotor support structure.

Advantageous refinements and improvements of the embodiments specified in the independent claims can be achieved by the measures recited in the dependent claims. It is particularly advantageous if a housing flange is formed at the axial side of the motor housing, which housing flange can be flanged to the customer connection flange. A defined, mechanically robust interface can thus be achieved, wherein the two flanges are either connected to each other individually by a decoupling element or optionally additional connecting means are used between the two flanges. Particularly advantageously, the housing flange can be connected to the customer connection flange by means of screws or rivets.

For the insertion of the connecting element into the housing flange or the customer connection flange, at least one through-bore is provided, wherein receptacles for the connecting element are correspondingly formed in the other flange. In order to mechanically decouple the two flanges, the fastening sleeve is inserted into the through-bore, the circumference of which is surrounded by a decoupling element. The rigid fastening sleeve is thereby mechanically decoupled with respect to the flange with the through-bore. At the same time, the connecting means can construct a very robust connection between the two flanges within the rigid fastening sleeve.

The fastening sleeve can have an abutment flange at the axial end for axial abutment of the screw head in order to transmit a higher fastening force between the two flanges. Here, the decoupling element is likewise interposed axially between the abutment flange extending transversely to the axial direction and the corresponding surface of the flange with the through-bore. The decoupling element is particularly preferably designed here as a decoupling sleeve, which has an annular disk at its axial end, which is supported axially on a flange of the fastening sleeve. The decoupling sleeve is then inserted into the through-bore and the rigid fastening sleeve is again inserted into the decoupling sleeve. The connecting means are axially inserted into the fastening sleeve. The screw head then in the assembled state bears axially against the abutment ring of the fastening sleeve, wherein the abutment ring is supported axially by the annular disk of the decoupling element at the surface of the flange with the through-bore. It is thereby reliably avoided that the connecting means or the rigid fastening sleeve directly abuts against the flange formed with the through-bore.

In order to prevent direct transmission of solid sound between the two flanges, a planar decoupling element is arranged between the housing flange and the customer flange, preferably covering the entire axial contact surface between the two flanges. The decoupling element can be configured as an annular disk, which surrounds the output shaft without interruption. In this case, corresponding bores can be cut out in the region of the through-bore, through which bores the connecting means protrude in the axial direction. The annular disk can be inserted between the two flanges in the form of an axial sealing ring and is made of rubber or elastomer or silicone, for example.

The connecting element can be embodied in a particularly cost-effective manner as a screw which protrudes through the through-bore of the flange into a corresponding receptacle of the other flange. As a receiving portion, an internal thread can be cut directly into the housing flange or the customer connection flange, into which the screw element is screwed. The screw head presses the abutment ring of the rigid fastening sleeve axially against the surface of the corresponding flange via the annular disk-shaped decoupling element. This allows a very high connecting force to be achieved with a simultaneously good mechanical decoupling between the two flanges.

In an alternative embodiment, the decoupling element is arranged in a tubular manner directly on the outer circumferential surface of the cylindrical motor housing. The motor housing, together with the tubular decoupling element, engages axially into an axial recess in the client connection flange. The tubular decoupling element thus bears radially directly on the one hand against the cylindrical motor housing and on the other hand directly against the cylindrical inner surface of the tubular axial projection of the client coupling flange. The tubular motor housing without the housing flange can thus be connected to the flange of the customer interface in a very space-saving and vibration-damping manner.

In this case, the tubular motor housing overlaps the axial profiling in the client flange in the axial direction, while the end face of the motor housing does not touch the client flange in the axial direction. The cylindrical motor housing is thereby securely pressed into the axial recess of the customer flange by the tubular decoupling element, without the motor housing directly touching the customer flange. Such tubular decoupling elements can be configured, for example, as metal foam or metal braid or as rubber or elastomer components.

In a further embodiment, the decoupling element is configured as a metallic spring ring or tolerance ring, which is tensioned radially between the motor housing and an axial profiling in the customer flange. The spring ring has a radially elastic region which centers the motor housing with a high fastening force radially within the axial receptacle of the client flange. Alternatively, the spring ring can have an axially elastic region, by means of which the motor housing is also supported axially elastically on the client connection flange. For this purpose, a circumferential flange can preferably be formed on the motor housing, against the radial circumferential surface of which the spring ring bears elastically. Alternatively, the spring ring can also bear against the axial end face of the encircling flange.

It is particularly advantageous if the housing flange is completely surrounded by the decoupling element with respect to the axial direction. The decoupling element is not only seated against the two axial end faces of the housing flange, but also against the radial circumferential surface of the housing flange. The decoupling element in turn bears axially against the surface of the customer flange. The decoupling element is radially abutted against the axially projecting cylindrical inner wall of the client flange. In order to securely fasten the motor housing to the axial projection of the customer flange, radial webs are formed which overlap the housing flange in the radial direction. A decoupling element is likewise arranged axially between the radial webs and the housing flange. The decoupling element can be embodied, for example, as an injection molding which is produced separately and is attached to the housing flange or is injection molded directly onto the housing flange. The radial webs are preferably formed in the radial direction only after the housing flange together with the decoupling element has been inserted axially into the receptacle in the customer flange.

According to a further embodiment, the decoupling element forms a form fit between the housing flange and the receptacle of the customer flange with respect to the circumferential direction. For this purpose, radial recesses are formed both in the housing flange and in the axial shaping of the customer flange, into which recesses the decoupling elements engage in the radial direction. Thereby preventing the motor housing from being able to twist relative to the customer flange. The decoupling element can be produced here as a separately produced insert which is pressed axially into the annular gap between the housing flange and the radially inner surface of the axial molding. Alternatively, the decoupling element can also be injection molded directly to the housing flange and directly to the axial receptacle of the customer flange.

Particularly advantageously, the decoupling element can be made of an elastic material, such as an elastomer or silicone or an adhesive or a metal foam or a metal braid or can be produced as a liquid seal. Such decoupling elements exhibit large impedance levels, which strongly buffer solid sound transmission, due to the large density differences relative to the motor housing and to the customer flange. Here, a material having good heat conductive ability in addition to the cushioning effect can be selected according to the requirements.

The electric machine is preferably designed as an electric motor, wherein the stator base body is supported in the motor housing. The rotor is arranged radially inside the stator and is supported in the motor housing by a bearing cap. The output torque of the electric motor is guided via the rotor shaft outwards through a central axial through opening in the bottom of the motor housing and in the client connection flange. For use as a servo drive or a rotary drive in a motor vehicle, both the motor housing and the customer connection flange are preferably also made of metal, in order to be able to operate the electric motor even at higher power and higher temperatures and greater vibrations.

For the connection of the motor housing to the flange of the customer interface, radially protruding mounting holes can be arranged at the motor housing. For example, two or three or four mounting holes can be formed on the periphery of the motor housing. The regions of the mounting bores here extend only over a discrete angular range, so that no housing flange is formed between the mounting bores in the circumferential direction. In an alternative embodiment, the housing flange is embodied without interruption over the entire circumference of the motor housing, wherein, for example, bores for the connecting means are arranged correspondingly distributed over the circumference.

In particular, in the case of T-shaped stator sections, a plurality of individual sheet metal pieces are advantageously stacked axially on top of one another and connected axially to one another. For example, the individual sheet metal pieces can be pressed against one another in the axial direction by means of a press-pack. Insulation sheets, on which the electrical windings are wound, are respectively placed at the end sides of the stator sections. The wound single tooth section is then assembled into a yoke ring in the motor housing. The yoke segments can be produced in particular by means of so-called pre-cutting techniques, in which the unwound stator ring is firmly joined to one another by means of predetermined breaking points (sollbruchshellen) or by means of positive yoke segment contours. For winding, the individual T-shaped yoke sections are separated from each other and, after winding, are again assembled to the same original arrangement. The radial contact force of the motor housing is responsible for pressing the respective T-shaped stator sections against one another, again in the tangential direction, at their original pressing surfaces. The cogging torque (rastrim) of such a motor can thus advantageously be significantly reduced.

The electric machine is preferably configured as an EC motor, wherein a coupling structure is arranged axially above the stator base body, which coupling structure is connected on the one hand to the electrical windings of the stator base body and in particular to an electronics unit for electronically commutating the electrical windings. In this case, different coupling arrangements can be realized.

Drawings

Embodiments of the invention are illustrated in the accompanying drawings and explained in more detail in the following description.

Wherein:

figure 1 schematically shows a first embodiment of an electric machine according to the invention,

figures 2 and 3 show a further variant of the motor according to the invention with a screw connection,

FIG. 4 shows another embodiment with a tolerance ring-connection, and

fig. 5 to 7 show further variants of the electric machine according to the invention with a form-fitting flange connection.

Detailed Description

Fig. 1 schematically shows a stator 10 of an electric machine 12, which has a stator base 34 with a loop ring 38 in the circumferential direction 9, from which radial stator teeth 14 extend for receiving an electric winding 20 wound with winding wire. The stator base 34 is preferably assembled from individual sheet metal pieces 36 which are stacked one on top of the other in the axial direction 8 and connected to form a lamination stack. The stator base 34 engages, in particular is pressed into, a stator housing embodied as the motor housing 15. The stator base 34 is in this case in a planar thermally conductive manner against the inner side 16 of the motor housing 15 in the radial direction 7. Accordingly, the heat generated in the stator 10 can be released to the motor housing 15. By the planar, rigid abutment of the stator base 34 against the inner wall 16 of the motor housing 15, solid sound produced during operation of the electric machine 12 due to deformation of the stator base 34 is transmitted to the motor housing 15. The motor housing 15 has a cylindrical wall 18, on whose first axial side 31 a base 17 is formed. The motor housing 15 is connected to a flange of the customer interface 50, by means of which the output torque of the electric machine 12 is transmitted to customer-specific applications. For example, the electric motor 12 is thus flanged to a steering gear or a brake or a transmission unit in the motor vehicle. The flange of the client interface 50 is disposed axially adjacent to the motor housing 15. The flange of the customer interface 50 is connected to the motor housing 15 via a decoupling element 44, which on the one hand dampens solid sound vibrations generated in the stator 10 by means of a large impedance level and on the other hand enables good heat conduction between the motor housing 15 and the flange of the customer interface 50. Radial vibrations are excited during operation of the motor 12 by electromagnetic forces generated in the stator matrix 34. For each layer transition into an adjacent component, the solid sound-vibration energy transmission e1, e2, e3 is damped by the reflection r1, r2, r3 of the respective impedance level. The greatest impedance level is established between the decoupling element 44 and the customer flange 50 and between the decoupling element 44 and the motor housing 15, so that a maximum damping effect is achieved by the decoupling element 44. For example, decoupling element 44 is axially tensioned between base 17 and customer flange 50, so that the transmission of solid sound vibrations to the flange of customer interface 50 is at least greatly reduced.

In fig. 2, a further embodiment of the electric machine 12 is shown, wherein a housing flange 30 is formed at the motor housing 15. The housing flange 30 can be realized here as individual discrete mounting bores 29, which are formed at different angular ranges in the circumferential direction 9. Alternatively, the housing flange 30 can also be configured as a closed circumferential ring. In fig. 2, a through-bore 54 extending in the axial direction 8 is formed in the housing flange 30, into which the connecting element 52 can be inserted. A rigid fastening sleeve 60 is inserted into the through-bore 54, which fastening sleeve receives the connecting means 52, which is embodied, for example, as a screw 53. The decoupling element 44 is embodied here as a decoupling sleeve 45 between the fastening sleeve 60 and the through-bore 54 in the radial direction. The fastening sleeve 60 has, in particular, an abutment ring 62 which extends in the radial direction 7. The abutment ring 62 can alternatively also be constructed as a separately produced component. The further decoupling element 44 is formed as an annular disk 46 in the axial direction 8 between the abutment ring 62 and the axial first surface 27 of the housing flange 30. The annular disk 46 is preferably formed as a decoupling element 44 integrally with the decoupling sleeve 45. The decoupling element 44 can be embodied here, for example, as a rubber or elastomer component, which is mounted or placed separately or injection molded onto the fastening sleeve 60. By the combination of the annular disk 46 and the decoupling sleeve 45, the fastening sleeve 60 is not in direct abutting contact with its abutment ring 62 with respect to the housing flange 30. The further decoupling element 44 is formed axially between the housing flange 30 and the flange of the customer interface 50 as an intermediate layer 47, which prevents the housing flange 30 from directly abutting the flange of the customer interface 50. In the flange of the customer interface 50, a receptacle 55 for the connection means 52 is formed, which is embodied, for example, as an internal thread 56. If the screw 53 as the connecting means 52 is now, for example, axially inserted into the fastening sleeve 60, the screw head 93 axially abuts against the abutment ring 62 as soon as the screw 53 is screwed into the internal thread 56. A mechanically robust connection from the motor housing 15 to the customer flange 50 with good vibration decoupling can thereby be produced. The customer flange 50 preferably has a central through opening 58 through which the output shaft 22 of the rotor 11 can be guided. An annular axial wall 19 is formed, for example, at the bottom 17 of the motor housing 15, which axially engages in a corresponding axial formation 51 in the customer flange 50. The decoupling element 44 embodied as an intermediate layer 47 is also arranged radially between the axial wall 19 of the motor housing 15 and the axial profiling 51 in the customer flange 50 in order to dampen the vibration transmission. Alternatively, the motor housing 15 can also be centered relative to the customer flange 50 by fastening the sleeve 60 or by an O-ring seal. A first bearing 71 for the rotor 11 is arranged in the bottom 17. The rotor 11 is held at the second axial side 32 of the motor housing 15 by means of a bearing cover 73 in the second bearing 72.

The stator base 34 in the motor housing 15 is assembled, for example, from individual sheet metal pieces 36 which are joined one above the other in the axial direction 8. The sheet 36 is preferably stamped into a T-shaped stator section 35 so that the stator teeth 14 are integrally formed with the yoke section 37. In the assembled state, the respective yoke section 37 forms a loop 38. The stator sections 35 are preferably stamped by means of a precut technique, so that immediately adjacent yoke sections 37 are pressed back again directly in the axial direction into their original position after the complete or partial through-stamping. The stator base 34 can thus be transported as a closed loop before the individual T-shaped stator sections 35 are separated for winding. In this case, after the winding has been completed, the T-shaped stator section 35 is reassembled and inserted into the motor housing 15 according to its previous position before the winding. An insulating cover 40 is arranged on the axial end face of the stator base 34, which cover preferably covers the end face to a large extent with insulating material. The insulating cover 40 is preferably constructed as a plastic injection molding, which is placed axially onto the stator base 34. The windings 20 arranged on the insulating cover 40 are in electrical contact with a coupling assembly 74, by means of which the desired coupling to the electrical phase is achieved. The winding 20 is preferably embodied in the form of a single-tooth coil 21, which is arranged on the individual stator teeth 14. In fig. 2, the stator teeth 14 are directed radially inwards, so that the rotor 11 is supported within the stator teeth 14, which rotor is driven as an inner rotor by the stator 10. The connection of the winding 20 to the coupling assembly 74 is achieved by means of electrical conductor elements 75, which are preferably contacted by means of welding, soldering, or press-in contact, or a clip-on connection. Axially above the coupling assembly 74, for example, an electronics unit, not shown, is arranged, by means of which the electrical winding 20 can be electronically commutated. In this case, a signal transmitter can be arranged on the rotor 11, which signal transmitter interacts with a sensor for detecting the rotational position of the rotor 11, which sensor is preferably arranged in the electronics unit.

Fig. 3 shows a further variant of an electric machine 12, in which the stator 10 and the rotor 11 are constructed according to fig. 2. However, in this embodiment, a through-bore 54 for the connection means 52 is configured in the customer flange 50. The fastening sleeve 60 is thus now inserted into the customer flange 50. According to fig. 2, a decoupling sleeve 45 is arranged at the circumferential surface 61 of the fastening sleeve 60. Here, the decoupling sleeve 45 abuts against the inner side of the through-bore 54. The abutment ring 62 is in turn formed at the fastening sleeve 60 or is accessed as a separate component against which the screw head 93 axially abuts. An annular disk 46 is arranged for mechanical decoupling in the axial direction 8 between the abutment ring 62 and an axially outer face 64 of the customer flange 50. An elastic intermediate layer 47 is arranged axially between the customer flange 50 and the housing flange 30 in order to mechanically decouple the motor housing 15 from the customer flange 50 in the axial direction 8. In the housing flange 30, as a receptacle 55, an internal thread 56 is formed, into which the screw 53 is screwed as the connecting element 52. The embodiment according to fig. 3 thus differs from fig. 2 essentially in that the connecting means 52 are mounted axially from the side of the customer flange 50 or from the side of the motor housing 15.

Instead of forming the internal thread 56 at the customer flange 50 or at the housing flange 30, in a further variant the internal thread 56 can also be formed within a fastening sleeve 60 which engages either in the customer flange 50 or in the housing flange 30. The screw 53 can be introduced here from the side of the customer flange 50 or from the side of the housing flange 30. The fastening sleeve 60 is supported axially with the profiled abutment ring 62 axially opposite the screw head 93 at the outer axial face 64 of the customer flange 50 or at the axial surface 27 of the housing flange 30.

Fig. 4 shows another embodiment of the electric machine 12, wherein a customer flange 50 is arranged axially adjacent to the motor housing 15. However, the housing flange 30 is not formed at the motor housing 15, but rather the decoupling element 44 is arranged radially outside at the cylindrical wall 18 of the motor housing 15. The motor housing 15 is configured, for example, as a deep drawn part or as a tube by means of extrusion. The decoupling element 44 is also configured in tubular fashion and bears radially against the inner side of the axial shaping 51 of the client flange 50. The motor housing 15 is completely mechanically decoupled from the customer flange 50 by a tubular decoupling element 44 in relation to the radial direction 7. In the axial direction 8, the motor housing 15 does not rest directly against the customer flange 50. The axial shaping 51 of the customer flange 50 is here embodied as a tubular axial projection 91. The motor housing 15 can be pressed with a tubular decoupling element 44 arranged thereon into the axial molding 51. Optionally, a further connecting means 52 can additionally be arranged between the customer flange 50 and the motor housing 15, which is preferably decoupled by means of a further decoupling element 44. The tubular decoupling element 44 can be made of rubber or elastomer or be formed as a metal foam or metal braid.

In another embodiment according to fig. 5, the decoupling element 44 is embodied as a spring ring 48, which is arranged between the motor housing 15 and the customer flange 50. The spring ring 48 has a radially elastic section 80 which radially tightens the motor housing 15 relative to the axial shaping 51 of the customer flange 50, in particular in the form of a tolerance ring 49. The axial shaping 51 can in turn be shaped as a tubular axial projection 91 at the customer flange 50. The motor housing 15 here has, for example, a circumferential housing flange 30 which engages in an axial molding 51. The spring ring 48 is radially tensioned between the radially outer surface 84 of the housing flange 30 and the radially inner side 95 of the axial shaping 51. The spring ring 48 furthermore has an axially elastic section 82, which also mechanically decouples the housing flange 30 axially relative to the customer flange 50. The spring ring 48 is fixed, for example, in a form-fitting manner, to the customer flange 50, by corresponding deformation of the spring ring 48 or by additional fastening elements.

Fig. 6 and 7 show a further embodiment of a decoupling element 44, which surrounds the housing flange 30 at the axial surface 27 and at the radial outer surface 84 and at the axial lower surface 28. The decoupling element 44 can be embodied, for example, as an elastomer or as a silicone or as an adhesive, and in particular also be injection molded onto the housing flange 30. The decoupling element 44 is surrounded by the customer flange 50 and an axial projection 90 formed thereon in a form-fitting manner with respect to the axial direction 8. Radial webs 89 are formed on the axial projections 90, which webs overlap the housing flange 30 in the radial direction 7. The housing flange 30 is not directly supported here by the customer flange 50, nor by the axial projections 90 thereof, nor by the radial webs 89 thereof, but only indirectly by the decoupling element 44. As can be seen in fig. 7 in a section transverse to the axial direction 8, the decoupling element 44 forms a form fit between the housing flange 30 and the customer flange 50 with respect to the circumferential direction 9. For this purpose, both the radially outer surface 84 of the housing flange 30 and the axial projection 90 of the customer flange 50 or the tubular axial projection 91 also have radial recesses 88, into which the decoupling elements 44 engage in each case in the radial direction. The decoupling element 44 can preferably be produced here as a plastic injection molding, which is injection molded directly, for example, onto the housing flange 30 and onto the customer flange 50. The decoupling element 44 is designed in this case in the form of a ring and in particular completely surrounds the cylindrical wall 18 of the motor housing 15. In this case, radial nubs 99 are formed on the decoupling element 44, which nubs engage in a positive-locking manner in the radial recesses 88 of the axial projections 90 of the housing flange 30 and of the customer flange 50.

It should be noted that various combinations of the individual features with one another are possible with respect to the embodiments shown in the figures and in the description. The specific design of the motor housing 15, of the housing flange 30, and of the customer flange 50 with its axial profiling 51 can then be varied, for example. The embodiment of the stator base 34 and the rotor 11 together with the output shaft 22 can likewise be adapted to the use of the electric machine 12 and to the possible variants of the described processing. The electric machine 12 is preferably configured as a brushless commutated EC motor, wherein different couplings of the windings 20 can be realized. Depending on the embodiment of the decoupling element 44 in terms of its geometry, it can be composed of an elastomer or of silicone or of an adhesive, or of a metal foam or of a metal braid or of a liquid seal. The stator 10 is assembled in particular from individual T-shaped sections 35, however, it can also be embodied as a complete section stator with an uninterrupted, closed loop 38. The invention is particularly suitable for rotary drives or adjustment mechanisms for components of a motor vehicle, but is not limited to this use.

Claims (15)

1. An electric machine (12) having a stator base body (34) with an annular yoke region (13) and radial stator teeth (14) arranged at the yoke region for receiving an electric winding (20), wherein the stator base body (34) is inserted into a cylindrical motor housing (15), such that the yoke region (13) is supported radially on an inner side (16) of the motor housing (15) and a customer connection flange (50) is arranged axially adjacent to the motor housing (15), and at least one decoupling element (44) is inserted between the customer connection flange (50) and the motor housing (15), by means of which decoupling element the customer connection flange (50) is fastened at the motor housing (15) in a mechanically vibration-damping manner.

2. The electric machine (12) according to claim 1, characterized in that the motor housing (15) has a housing flange (30) at an axial end (31), which is connected, in particular screwed, to the customer connection flange (50).

3. The electric machine (12) according to any one of the preceding claims, characterized in that at least one through-bore (54) for a connecting means (52) is formed in the housing flange (30) and/or in the customer joint flange (50), and a fastening sleeve (60) is placed in the through-bore (54), the decoupling elements (44, 45) being arranged at the circumferential surface (61) of the fastening sleeve.

4. The electric machine (12) according to any one of the preceding claims, characterized in that the fastening sleeve (60) has an abutment ring (62) for the connection means (52), and in that the decoupling element (44, 46) is configured annularly and is arranged axially between the abutment ring (62) and the housing flange (30) and/or the customer joint flange (50), and in particular in that the annular decoupling element (44, 46) is configured integrally with the decoupling element (44, 45) at the circumferential surface (61) of the fastening sleeve (60).

5. The electric machine (12) according to any one of the preceding claims, characterized in that the decoupling element (44, 47) is arranged axially between the housing flange (30) and the customer joint flange (50), and in particular a through-bore (54) for the connecting means (52) is omitted in the decoupling element (44, 47).

6. The electric machine (12) according to any one of the preceding claims, characterized in that the connecting means (52) is configured as a screw (53) and screwed into an internal thread (56) in the housing flange (30) and/or into a flange (50) of the customer interface, wherein a screw head (93) axially presses the decoupling element (44, 46) between an abutment ring (62) of the fastening sleeve (60) and the customer joint flange (50) and/or the housing flange (30).

7. The electric machine (12) according to any of the preceding claims, characterized in that the decoupling element (44) is arranged annularly at the radial outer circumference of the motor housing (15), and that the radial outer surface (42) of the decoupling element (44) presses against the radial inner side of the axial shaping (51, 91) of the flange of the customer interface (50).

8. The electric machine (12) according to any of the preceding claims, characterized in that the decoupling element (44) is of tubular construction and the motor housing (15) does not bear directly against the customer joint flange (50) in the axial direction.

9. The electric machine (12) according to any one of the preceding claims, characterized in that the decoupling element (44) is configured as a radially elastic tolerance ring (48, 49) and is tensioned radially and in particular also axially between the housing flange (30) and an axial receptacle (51, 91) of a flange of the customer interface (50).

10. The electric machine (12) according to any one of the preceding claims, characterized in that the decoupling element (44) is configured as an injection molding of the housing flange (30) which surrounds the housing flange at an axially lower side (28) and at an axially upper side (27), and in particular the axial projections (90, 89) of the flange of the customer interface (50) surround the injection molded housing flange (30) in the axial direction (8), and preferably a undercut is configured in relation to the axial direction (8) together with the housing flange (30).

11. The electric machine (12) according to any of the preceding claims, characterized in that the injection-molded envelope forms a form fit with the housing flange (30) and with the customer joint flange (50) with respect to the circumferential direction (9).

12. The electric machine (12) according to any of the preceding claims, characterized in that the decoupling element (44) has an elastomer or silicone or adhesive or a liquid seal or a metal foam or a metal braid and is directly abutted at the motor housing (30) and/or at the customer joint flange (50).

13. The electric machine (12) according to any one of the preceding claims, characterized in that the motor housing (15) and the customer connection flange (50) are made of metal, and in particular the motor housing (15) and customer connection flange (50) have a centered through opening (58) for the through-guiding of an output shaft (22) of a rotor (11) which is supported radially within the stator base body (34).

14. The electric machine (12) according to any of the preceding claims, characterized in that the housing flange (30) is configured as a plurality of radially protruding mounting holes (29) which extend at the cylindrical motor housing (15) only at discrete circumferential angles.

15. The electric machine (12) according to any of the preceding claims, characterized in that the stator base body (34) is assembled from a plurality of T-shaped stator sections (35), wherein a single stator tooth (14) is formed radially inwards at a yoke section (37) respectively, and the yoke section (37) is pressed against each other in the circumferential direction (9) within the motor housing (15), and in particular the T-shaped stator sections (35) are stamped by means of a precut technique prior to winding.