Electric machine with stator holding system

Abstract

Electric machine system, including: a multi-phase stator that surrounds a rotor in a circumferential direction; a housing that at least partially encloses the multiphase stator; and a stator holding device designed to secure the multiphase stator in the housing; the stator holding device includes: a wedge ring that is positioned between the outer diameter of a stator lamination stack and the inner diameter of the housing; a cylindrical nut coupled to an axial end of the stator lamination stack and the housing, wherein the threaded nut exerts an axial clamping force on the stator lamination stack; or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being coupled to the housing.

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] The present application claims priority over preliminary US application No. 63 / 747,237, entitled “ELECTRIC MACHINE WITH STATOR RETENTION SYSTEM”, filed on January 20, 2025. The entire content of the aforementioned application is hereby incorporated by reference for all purposes. TECHNICAL AREA

[0002] The present disclosure relates to an electric machine with a stator holding system. BACKGROUND AND DETOUR

[0003] Electric motors are used in vehicles to generate propulsion power and in a variety of other applications. In many electric motors, the stator is attached to the housing via an interference fit. However, inventors have recognized that existing methods for positioning and securing the stator assembly in the housing, such as interference fits, limit ease of maintenance, restrict installation space, and / or increase weight. Furthermore, pressing the stator into the motor housing permanently bonds it to the housing structure.

[0004] Attempts were made to bolt the stator to the housing. While bolting the stator to the housing improves ease of maintenance, it leads to a significant increase in the size of the flange, the housing, and the stator laminations, which considerably increases the weight and consumes valuable installation space.

[0005] The inventors recognized the aforementioned problems and developed an electric motor system that can at least partially overcome them. In one embodiment, the electric motor system comprises a housing that circumferentially surrounds a stator, a cover detachably connected to the housing, and several washers and / or springs arranged between an axial end of the stator and the cover. In this system, the washers and / or springs preload the stator, creating a clearance fit between the inner diameter of the housing and the outer diameter of the stator.

[0006] In another example, an electric machine system is provided that includes a housing circumferentially surrounding a stator, as well as a threaded nut detachably connected to an axial side of the stator. Furthermore, the system features a clearance fit between the inner diameter of the housing and the outer diameter of the stator.

[0007] In another example, an electric machine system is provided comprising a housing that surrounds a stator in the circumferential direction, as well as a conical wedge device that is positioned between the inner diameter of the housing and the outer diameter of the stator.

[0008] The stators in the systems described above are mounted similarly to a bolted stator, i.e., an axial clamping force is applied via the stator laminations; however, they do not require large projections on the stator laminations or an enlarged cavity in the motor housing to accommodate long bolts running the entire length of the stator, thus increasing the system's space efficiency where required. Furthermore, the systems described above allow for easier stator maintenance and offer the possibility of using a softer material in the axial clamping direction to dampen some of the vibrations emanating from the stator at the connection points to the housing, if necessary.

[0009] It should be noted that the foregoing summary serves to present, in simplified form, a selection of concepts that are further explained in the detailed description. It does not serve to identify essential features of the claimed subject matter, the scope of which is defined exclusively by the claims following the detailed description. Furthermore, the claimed subject matter is not limited to implementations that eliminate the disadvantages mentioned above or in any part of this disclosure. BRIEF DESCRIPTION OF THE FIGURES Fig. Figure 1 shows a schematic representation of an electrical machine in a system. Fig. Figure 2 shows an example of an electric machine with a lid and a housing. Fig. Figure 3 shows another example of a medium cover plate. Fig. Figure 4 shows an example of an electric machine with stator clamping nuts. The Fig. 5-6 show detailed views of one of the in Fig. 4 stator clamping nuts shown. Fig. Figure 7 shows another example of an electric machine with a wedge ring. DETAILED DESCRIPTION

[0010] This section describes electric machines with various stator mounting techniques that allow the stator to be housed in a removable, secure, and space-saving manner. In one example, washers and / or springs are positioned between a cover and the stator to axially fix the stator laminations. In another example, stator clamping nuts are detachably attached to opposite axial sides of the stator to clamp the laminations within the stator. In yet another example, a wedge ring is positioned between the inner diameter of a housing and the outer diameter of a stator.

[0011] Fig. Figure 1 shows an example of an electric drive 100 with an electric machine system 102. The electric drive 100 can, for example, be integrated into an electric powertrain 103 of a vehicle 105. In such an example, the electric machine included in the electric drive can be a traction motor. However, it is understood that the electric drive 100 can be used in a variety of fields, including, but not limited to, industrial machinery, agricultural systems, mining systems, and the like.

[0012] In the electric drive 100, the inverter 108 is electrically coupled to the electric machine 104. The inverter 108 can be electrically connected to an energy storage device 110 (e.g., one or more traction batteries, capacitor(s), fuel cell(s), combinations thereof, and the like). Therefore, during drive operation and regeneration operation, electrical energy can flow between the inverter and the energy storage device if the electric machine 104 is configured as a motor-generator.

[0013] The electric machine 104 comprises a stator 112 (e.g., a multiphase stator) and a rotor 114. The rotor 114 includes a rotor shaft 118 and a rotor core 120. In one embodiment, the rotor core 120 may contain permanent magnets. In another embodiment, the rotor core may be externally excited and therefore contain electromagnets. The electric drive 100 may be coupled to downstream components 128. In the EV example, the downstream components 128 may include one or more drive axles, drive wheels, a gearbox (e.g., a transmission), combinations thereof, and the like.

[0014] The electric machine 104 also includes a housing 140 that encloses the stator 112. The techniques for space-saving and demountable mounting of the stator in the housing are described here using the following examples: Fig. 2-7 explained in more detail.

[0015] The electric drive 100 can further comprise a control system 190 with a control unit 192, as shown in Fig. Figure 1 illustrates the control unit 192, which may include a microcomputer with components such as a processor 193 (e.g., a microprocessor unit), input / output interfaces, and an electronic storage medium 194 for executable programs and calibration values ​​(e.g., a read-only memory chip, random-access memory, keep-alive memory, a data bus, and the like). The storage medium may be programmed with computer-readable data representing instructions that can be executed by a processor to perform the procedures and control techniques described herein, as well as other variations that are expected but not specifically listed. Control techniques, procedures, and the like described herein may be stored as instructions in non-volatile memory.

[0016] The control unit 192 can receive various signals from sensors 195 that are coupled to different areas of the electric drive 100. For example, the sensors 195 can include a rotor current sensor, an electric machine speed sensor, a stator current sensor, an electric machine temperature sensor, an auxiliary contact sensor, a battery charge level sensor, an inverter current sensor, and the like. The speed of the electric machine can be determined from the power supplied to the electric machine 104 by the inverter 108. An input device 198 (e.g., accelerator pedal, brake pedal, drive mode selector, gear selector, combinations thereof, and the like, in the example of an electric vehicle) can also provide input signals indicating an operator's intention regarding the control of the electric drive.

[0017] Although in Fig. Figure 1 shows a control unit. The electric drive and the system into which it is integrated, such as a vehicle, can contain multiple control units. In the EV example, for instance, a vehicle control unit (VCU) can be integrated into the control system 190. Additionally, a motor control unit (MCU) can be integrated into the control system. In such an example, the VCU and the MCU can be separate control units with independent hardware and housed in separate enclosures spaced apart from each other. In other examples, however, the VCU and the MCU can be located side by side. In both cases, the VCU and the MCU communicate electronically with each other.

[0018] After receiving the signals from the various sensors, 195 of Fig. 1. The control unit 192 processes the received signals and uses various actuators 196 of the electric drive components to adjust the components based on the received signals and the instructions stored in the working memory of the control unit 192. For example, the control unit 192 can receive a signal indicating an operator request to increase the power of the electric machine. The control unit 192 can then instruct the inverter 108 to operate, adjusting the mechanical power of the electric machine and increasing the power supplied by the electric machine 104 to the downstream components 128. The other controllable components in the electric drive can operate similarly with respect to sensor inputs and command outputs.

[0019] An axis system is in Fig. 1 as well as in the Fig. Figures 2-7 are shown for reference where appropriate. The y-axis may be a vertical axis (e.g., parallel to a gravitational axis), the z-axis may be a lateral axis (e.g., a horizontal axis), and the x-axis may be a longitudinal axis in one example. In other examples, the axes may have other orientations. Furthermore, in Fig. 1 and, where applicable, in the Fig. 2-7 a central axis 180 (e.g. a rotation axis) of the electric machine 104 is shown for illustration.

[0020] Fig. Figure 2 shows an example of an electric machine 200 with a housing 202 that encloses a stator 204 and a rotor 206. A cover 208 is attached to an axial side 210 of the housing 202. A gap formed between the cover 208 and a side surface 212 of the stator 204 is filled with several washers and / or springs 214 (e.g., wave springs, helical springs, polymer springs, combinations thereof, and the like). The number of washers and / or springs can be selected based on the tolerances in the cover, the housing, and the stator, as well as the desired clamping force for the stator.

[0021] A gap 216 can be provided between the inner diameter 218 of the housing 202 and the outer diameter 220 of the stator 204. This allows the stator to be inserted into the housing with a clearance fit. This prevents contact with most of the outer stator surface, thus generating deflections that are not directly transmitted to the housing (potentially reducing noise, vibration, and harshness (NVH)). Furthermore, in one example, a softer material can be used in the axial clamping direction to dampen certain vibrations from the stator to the housing and the connection points. Fig. The stator 204 shown in Figure 2 is serviceable and can therefore be removed without risk of damaging the stator or the housing. A fastening device 222 (e.g., a bolt, a screw, combinations thereof, and the like) can be used for the detachable fastening of the cover 208 and the housing 202.

[0022] Fig. Figure 3 shows another example of an electric machine 300 with a housing 302 and a stator 304. In the illustrated example, a central cover plate 306 is detachably attached to the housing 302 by means of a fastening device 308, which is screwed into a housing bore 310. The end windings 312 of the stator 304 are arranged circumferentially within the central cover plate 306. The stator 304 also comprises windings 314, which are electrically connected to the end windings 312 and extend through a stator core 316.

[0023] Fig. Figure 4 shows another example of an electric machine 400. The electric machine 400 again comprises a stator 402 with end windings 404. A threaded nut 406 is screwed to an axial side 408 of the stator 402. The threaded nut 406 is arranged circumferentially outside the end windings 404. A vibration damping material 410 can be arranged between the threaded nut 406 and the stator 402. In this way, noise, vibration, and harshness (NVH) in the electric machine are reduced.

[0024] The threaded nut 406 has threads 412 which engage with the threads 416 in the stator 402 to form a threaded connection 414. More precisely, the threads 412 are located on the inner diameter of the threaded nut, while the threads 416 are located on an end plate 418 of the stator 402. However, other arrangements of the threads in the threaded nut and in the stator are also possible. The end plate 418 is connected to a stator core 420. More precisely, the end plate 418 is connected to an axial side 422 of the stator core 420. In the example shown, the end windings 404 pass through the end plate 418.

[0025] Fig. Figures 5-6 show detailed views of the threaded nut 406. The threaded nut 406 has a tool interface 500 designed to work with a wrench or special tool, allowing the nut to be tightened during installation and removal. This allows for a desired stylus compression during manufacturing, enabling efficient disassembly of the stylus for repairs, maintenance, etc.

[0026] Fig. Figure 5 shows in particular the thread 412 on the inner diameter 502 of the threaded nut 406. Fig. Figure 5 also shows the outer diameter 504 of the threaded nut 406.

[0027] Fig. Figure 6 shows a detailed view of the threaded nut 406, illustrating the geometry of the tool interface 500. In the example shown, the tool interface 500 comprises polygonal solid bodies 600 (e.g., rectangular solid bodies) arranged at equal intervals around the threaded nut with respect to the central axis 180. However, other tool interface geometries are also possible. Each of the solid bodies 600 has an inner surface 602, an outer surface 604, side faces 606, and an end face 608. The solid bodies 600 can also have chamfered surfaces 610 between the sides and the faces. However, other tool interface contours are also possible.

[0028] The tool interface 500 can further comprise recesses 612 between the solid bodies 600. The recesses 612 can have a stepped surface 614 and an axially aligned surface 618 adjacent to the stepped surface 614. In the example shown, the tool interface 500 also has a recess 616. However, other contours of the tool interface are also possible. Fig. Figure 6 also shows the threads 412. Fig. Figure 6 further shows the threaded nut 406 with a smooth outer surface 620. In alternative versions, however, the outer surface 620 of the threaded nut 406 can be provided with a thread.

[0029] Fig. Figure 7 shows another electric machine 700 with a housing 702, a stator 704, and a rotor 706. The electric machine 700 further includes a conical wedge device 708, which is arranged between the inner diameter 710 of the housing 702 and the outer diameter 712 of the stator 704 to fix the stator while simultaneously allowing its removal. The conical wedge device 708 can be screwed to the housing 702 and / or detachably attached to it in another way. In this way, the stator is fixed similarly to a press-fit stator, but—if desired—without the need for a thermal shrinkage process. Furthermore, the fastening techniques described here do not require large projections on the stator laminations or an enlarged cavity in the motor housing to accommodate, if necessary, long bolts extending the entire length of the stator.This method allows the stator to be attached to the housing more securely and in a more space-saving manner compared to more complex stator mounting systems. In such a case, the stator may not have any projections (e.g., bolt projections) on the outer housing.

[0030] The in Fig. The conical wedge device 708 shown in Figure 7 has a conical shape in the zy-plane in the illustrated example. Furthermore, in the illustrated example, a radial thickness 709 (measured from a radial axis originating at the machine's axis of rotation) tapers towards an axial side 711 of the machine, on which a threaded screw 716, also referred to as an extraction screw, is located. The threaded screw 716 will be discussed in more detail below. The conical wedge device 708 can be inserted into the machine at an axial side 713. The axial sides 711 and 713 are axially opposite sides.

[0031] The electric machine 700 further comprises a threaded engagement 714 in the housing 702, which is shaped to receive the threaded screw 716, thereby enabling the stator to be efficiently pulled out of the housing 702. More precisely: When the screw 716 is screwed into the threaded engagement 714, one end of the screw contacts an axial side 718 of the stator 704. The threaded engagement 714 can be arranged such that the screw 716 contacts the stator radially outside the end windings 720.

[0032] The Fig. Figures 1-7 and the accompanying description describe a method for manufacturing an electric machine system. The method includes, for example, joining an arrangement formed between a multiphase stator and a rotor with a housing. The method further includes securing the arrangement within the housing using a stator holding device. In such an example, the stator holding device comprises a wedge ring arranged between the outer diameter of a stator lamination stack and the inner diameter of the housing, and a cylindrical nut connected to an axial end of the stator lamination stack and the housing, the threaded nut exerting an axial clamping force on the stator lamination stack, or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being connected to the housing.In one example, the wedge ring can be arranged on a first axial side of the multiphase stator, and the method can further comprise separating the assembly from the housing by screwing an extraction screw into a threaded engagement located on a second axial side of the multiphase stator, opposite the first axial side. Furthermore, in one embodiment, securing the assembly in the housing by means of the stator holding device can include screwing the cylindrical nut into the housing; the cylindrical nut can have a thread on its outer diameter that engages with the thread on the inner diameter of the housing.

[0033] The Fig.Figures 1-7 show exemplary configurations with the relative positioning of the various components. If these elements are in direct contact with each other or directly coupled, they can be described as being in direct contact or directly coupled, respectively, in at least one example. Similarly, elements that are shown side by side or adjacent to each other can be described as being adjacent to each other or adjacent to each other, at least in one example. For instance, components that are in planar contact with each other can be described as being in planar contact. As a further example, elements that are separated from each other, with only a gap between them and that have no other components, can be described as such in at least one case.In yet another example, elements that are displayed above / below each other, on opposite sides, or to the left / right of each other can be described as such, relative to one another. Furthermore, in at least one example, as shown in the figures, a topmost element or the highest point of an element can be referred to as the "top" of the component, and a bottommost element or the lowest point of the element can be referred to as the "bottom" of the component. The terms top / bottom, upper / lower, and above / below used here can refer to a vertical axis of the figures and be used to describe the positioning of elements within the figures relative to each other. Thus, in one example, elements displayed above other elements are arranged vertically above the other elements.As a further example, the shapes of the elements depicted in the figures can be described as such (e.g., circular, straight, planar, curved, rounded, chamfered, angled, and the like). Furthermore, in one example, elements that are coaxial with each other can be described as such. Additionally, the depicted elements that intersect each other can be described as intersecting elements or as mutually intersecting elements in at least one example. Moreover, an element that is depicted inside or outside another element can be described as such. In other examples, elements that are offset from each other can also be described as such. In further examples, the relative position of elements can be described using radial axes, circumferential directions, internal and external directions, and the like.

[0034] The invention is described in more detail in the following paragraphs. In one embodiment, an electric machine system is provided, comprising a housing circumferentially surrounding the stator, a cover detachably connected to the housing, and several washers and / or springs arranged between an axial end of the stator and the cover, wherein the washers and / or springs preload the stator and wherein a clearance fit is formed between the inner diameter of the housing and the outer diameter of the stator. In one example, the electric machine system can be integrated into an electric drive train.

[0035] In another example, an electric machine system is provided comprising a housing circumferentially surrounding a stator and a threaded nut detachably connected to an axial side of the stator, with a clearance fit formed between the inner diameter of the housing and the outer diameter of the stator. In one embodiment, the electric machine may further include a vibration damping device arranged axially between the stator and the threaded nut. In another example, the threaded nut may be arranged radially outside a stator winding.

[0036] In another example, an electric machine system is provided that includes a housing circumferentially surrounding a stator and a conical wedge device located between the inner diameter of the housing and the outer diameter of the stator. In one example, the housing may have a threaded opening designed to receive a threaded extraction screw.

[0037] In another aspect, an electric machine system is provided comprising a multiphase stator circumferentially surrounding a rotor; a housing that at least partially encloses the multiphase stator; and a stator holding device configured to fix the multiphase stator within the housing. The stator holding device comprises: a wedge ring arranged between the outer diameter of a stator lamination stack and the inner diameter of the housing; a cylindrical nut connected to an axial end of the stator lamination stack and the housing, the threaded nut exerting an axial clamping force on the stator lamination stack; or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being connected to the housing.In one embodiment, the wedge ring can be arranged on a first axial side of the multiphase stator, and the housing can have a threaded engagement located on a second axial side of the multiphase stator, opposite the first axial side. The threaded engagement can be configured to receive an extraction screw. In another example, wave springs can be used. In yet another example, the cover can be connected to the housing by a bolt. In another example, the bolt must not project beyond the axial centerline of the multiphase stator. In a further example, if the stator holding device includes the cover as well as one or more washers and springs, a gap can be created between the outer diameter of the stator lamination stack and the inner diameter of the housing.In another example, the cylindrical nut can have threads arranged on its outer diameter that engage with threads on the inner diameter of the housing. In yet another example, the electric machine system can further include a damping ring arranged axially between the cylindrical nut and the stator lamination stack. In another example, the cylindrical nut can be arranged axially within the stator windings. In yet another example, the cylindrical nut has a tool interface on its outer axial side. In yet another example, the tool interface can have a plurality of teeth arranged circumferentially around the body of the cylindrical nut. In yet another example, a gap can form between the outer diameter of the stator lamination stack and the inner diameter of the housing.

[0038] In another aspect, a method for manufacturing an electric machine system is provided, which includes joining an arrangement formed between a multiphase stator and a rotor with a housing;

[0039] Securing the arrangement in the housing by means of a stator holding device; wherein the stator holding device comprises: a wedge ring arranged between the outer diameter of a stator lamination stack and the inner diameter of the housing; a cylindrical nut connected to an axial end of the stator lamination stack and the housing, the threaded nut exerting an axial clamping force on the stator lamination stack; or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being connected to the housing.In one example, the wedge ring can be arranged on a first axial side of the multiphase stator, and the method further comprises: separating the assembly from the housing by screwing an extraction screw into a threaded engagement located on a second axial side of the multiphase stator, opposite the first axial side. In another example, securing the assembly in the housing using the stator holding device can include screwing the cylindrical nut into the housing; wherein the cylindrical nut can have threads on its outer diameter that engage with the threads on the inner diameter of the housing.

[0040] In another aspect, a traction motor system is provided comprising a multi-phase stator surrounding a rotor in the circumferential direction, a housing that at least partially encloses the multi-phase stator, and a stator holding device designed to fix the multi-phase stator within the housing; The stator holding device comprises: a wedge ring arranged between the outer diameter of a stator lamination stack and the inner diameter of the housing; a cylindrical nut connected to an axial end of the stator lamination stack and the housing, the threaded nut exerting an axial clamping force on the stator lamination stack; or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being connected to the housing. In one example, the cylindrical nut may have threads on its inner diameter that engage with threads in the stator. In another example, the traction motor system may further comprise a vibration-damping material arranged between the cylindrical nut and the stator. In yet another example, the threads in the stator may be integrated into an end plate.In another example, the cylindrical nut has a tool interface on its outer axial side.

[0041] Although various embodiments have been described above, it should be understood that these are to be considered examples and not limitations. Those skilled in the art will recognize that the disclosed subject matter can be implemented in other specific forms without departing from the spirit of the subject matter. The embodiments described above are therefore to be regarded in every respect as illustrative and not as limiting. Thus, the configurations and routines disclosed here are exemplary in nature, and the specific examples are not to be considered limiting, as numerous variations are possible. The technology mentioned above can, for example, be applied to a wide variety of systems that include electric drives with different drive types, including internal combustion engines, such as in a hybrid vehicle.The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various systems and configurations, as well as other features, functions and / or properties disclosed herein.

[0042] It should be noted that the example routines for control and estimation contained herein can be used in various configurations of electrical machines and / or systems (e.g., drivetrain systems). The control methods and routines disclosed herein can be stored as executable instructions in non-transient memory and can be executed by the control system, including the controller, in combination with the various sensors, actuators, and other electrical drive and / or system hardware, in conjunction with the electronic control. Therefore, the described actions, operations, and / or functions can graphically represent code to be programmed into the non-volatile memory of the computer-readable storage medium in the electrical drive and / or system.The various actions, operations, and / or functions shown can be performed in the sequence presented, in parallel, or, in some cases, omitted. Accordingly, the processing sequence is not strictly necessary to achieve the features and benefits of the examples described here; it serves only for better illustration and description. One or more of the actions, operations, and / or functions shown can be executed repeatedly, depending on the specific strategy used. One or more of the procedural steps described here can also be omitted if desired.

[0043] The following claims highlight in particular certain combinations and subcombinations that are to be considered novel and not obvious. These claims may refer to "one" element or "a first" element, or the equivalent thereof. Such claims are to be understood as including one or more such elements, with two or more such elements neither required nor excluded. Other combinations and subcombinations of the disclosed features, functions, elements, and / or properties may be claimed by amending the present claims or by filing new claims in this or a related application. Such claims, whether they have a broader, narrower, the same, or different scope than the original claims, are also to be considered as included in the subject matter of the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 747,237

[0001]

Claims

[1] Electrical machine system comprising: a multi-phase stator that surrounds a rotor in a circumferential direction; a housing that at least partially encloses the multiphase stator; and a stator holding device designed to secure the multiphase stator in the housing; the stator holding device includes: a wedge ring that is positioned between the outer diameter of a stator lamination stack and the inner diameter of the housing; a cylindrical nut coupled to an axial end of the stator lamination stack and the housing, wherein the threaded nut exerts an axial clamping force on the stator lamination stack; or a cover and one or more washers and / or springs arranged axially between the cover and the stator lamination stack, the cover being coupled to the housing. [2] Electric machine system according to claim 1, wherein the wedge ring is arranged on a first axial side of the multiphase stator and the housing has a threaded engagement arranged on a second axial side of the multiphase stator opposite the first axial side, wherein the threaded engagement is designed to receive an extraction screw. [3] Electric machine system according to one of the preceding claims, wherein the springs are wave springs. [4] Electric machine system according to one of the preceding claims, wherein the cover is coupled to the housing via a bolt. [5] Electric machine system according to claim 4, wherein the bolt does not extend beyond an axial centerline of the multiphase stator. [6] Electric machine system according to one of the preceding claims, wherein, when the stator holding device comprises the cover as well as the one or more washers and springs, a gap is created between the outer diameter of the stator lamination stack and the inner diameter of the housing. [7] Electric machine system according to one of the preceding claims, wherein the cylindrical nut has a thread arranged on the outer diameter and engages in a thread on the inner diameter of the housing. [8] Electric machine system according to one of the preceding claims, further comprising a damping ring arranged axially between the cylindrical nut and the stator lamination stack. [9] Electric machine system according to one of the preceding claims, wherein the cylindrical nut is arranged axially within stator windings. [10] Electric machine system according to one of the preceding claims, comprising at least the features of claim 7, wherein: the cylindrical nut has a tool interface on its outer axial side; and / or The thread in the stator is contained in an end plate. [11] Electric machine system according to claim 10, wherein the tool interface comprises a plurality of teeth arranged circumferentially around a body of the cylindrical nut. [12] Electric machine system according to the claims, comprising at least the features of claim 7, wherein a gap is formed between the outer diameter of the stator lamination stack and the inner diameter of the housing.

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