CN113692688A

CN113692688A - Stator of an electric machine having a replaceable temperature sensor

Info

Publication number: CN113692688A
Application number: CN202080031068.XA
Authority: CN
Inventors: T·罗韦尔; L-A·科洛德尔; P·厄瑟; K·林德纳; Q·N·阮
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-04-26
Filing date: 2020-04-02
Publication date: 2021-11-23
Also published as: DE102019206006A1; WO2020216594A1

Abstract

The invention relates to a stator (2) of an electric machine (1), comprising: a stator axis (100); an electrical winding (8) having electrical conductors (16, 21), which respectively form winding heads (9) at the end sides of the stator (2); and a sensor holding device (10) having a metallic receiving region (11) for receiving a temperature sensor (14) and a metallic fastening region (12), wherein the fastening region (12) is mounted on at least one electrical conductor (16, 21) of the winding head (9), characterized in that the receiving region (11) projects in an axial direction with respect to the stator axis (100) relative to the winding head (9).

Description

Stator of an electric machine having a replaceable temperature sensor

Technical Field

The present invention relates to a stator of an electric machine. The stator is constructed in particular such that the temperature sensor can be replaced in a simple manner.

Background

Electrical machines are known from the prior art. In such an electric machine, a stator is present with electrical conductors which form an electrical winding. In US 2013/270973 a1, an electric machine is described in which the electric windings form winding heads at the end sides of the stator, respectively. A sensor element receiver for a temperature sensor is provided at one of the winding heads. In this way, the temperature of the stator, which is required in particular for controlling the electric machine, can be determined. The rotor and the stator of the electric machine can thus be protected against temperature, wherein the measured temperature can in particular also be incorporated into the torque regulation of the electric machine.

Disclosure of Invention

The stator of the electrical machine according to the invention enables an exchangeable solution for the temperature sensor. Here, the temperature sensor can be replaced easily a plurality of times when necessary. In particular, the bearing carrier is not removed in this case. Also, simplified processing of the temperature sensor can be achieved. This is achieved in particular by: the temperature sensor is easily accessible. Simultaneously, the following steps are realized: the temperature sensor enables an optimized temperature measurement.

The stator of the electrical machine has an electrical winding comprising electrical conductors. The windings are particularly advantageously designed as plug-in windings, in which case rigid, in particular U-shaped, conductor elements are inserted into the stator base body and then electrically connected to one another. At the end side of the stator, the electrical winding forms a winding head. In addition, the stator has a sensor holder. The sensor holding device comprises a metal receiving area and a metal fastening area. The receiving area is configured to receive a temperature sensor. The fastening region is formed on at least one electrical conductor of the winding head. The receiving region and the fastening region are preferably connected to one another in a thermally conductive manner, so that the temperature prevailing at the winding head can be determined by means of a temperature sensor. The entire sensor holding device is preferably made of the same metal material. The receiving region projects axially with respect to the winding head with respect to the stator axis. In particular, the temperature sensor can therefore be easily and easily accessed. The temperature sensor is not mounted directly on the winding head, but is spaced apart from this winding head. Nevertheless, a safe and reliable detection of the temperature of the winding head is possible. Preferably, the temperature sensor can be replaced without difficulty. The electric machine can therefore be designed in particular for high operating powers, since the temperature sensor can be easily and easily replaced in the event of a failure. The use of a sensor holder can in particular also simplify the complex wiring of the new sensor after replacement. Additionally, the use of a sensor holding device can reduce the electrical and/or air gap associated with the windings. The sensor holder can be used for all types of circuits of the electric machine, in particular not only for delta circuits but also for star circuits.

The contents of the dependent claims are advantageous further developments of the invention.

Preferably, the sensor holding device comprises an arm region, which is likewise metallic. The arm region extends between the fastening region and the receiving region and enables, in particular, heat conduction. The projection of the receiving region as described above with respect to the winding head is achieved in particular by an arm region which spatially separates the receiving region from the fastening region, but nevertheless allows heat transfer. The arm region extends at least partially in a radial direction with respect to the stator axis.

The fastening region of the sensor holder and the receiving region of the sensor holder, and particularly preferably also the arm region of the sensor holder, are in particular integrally formed. Particularly advantageously, the sensor holder is embodied as a stamped and bent part. This makes it possible to easily and easily manufacture the sensor holder. At the same time, the sensor holding device has a high thermal conductivity, so that undistorted temperature measurement is possible.

Preferably, the receiving region has a sheath, which is particularly advantageously embodied as an electrical insulator and/or is made of plastic. In this case, at least in some regions: the sheath does not rest directly on the receiving region, which is in particular of hollow-cylindrical design, so that an elastic expansion of the receiving region can be achieved. Thus, advantageously, a hollow cylindrical gap remains between at least a part of the receiving region and the sheath. The receiving region is electrically insulated by the sheath and is also protected in particular from external influences. The sheath can also be realized by applying a separate plastic sleeve.

In a preferred embodiment, the sheath has a cover section, a surrounding region and a desired breaking point. The cover section serves to enclose the receiving area, while the surrounding area serves to surround the receiving area. The desired breaking point is located between the cover section and the surrounding area. The shielding function of the receiving region can thus be realized in particular by the surrounding region. The cover section prevents foreign bodies from penetrating into the receiving region. If, on the other hand, a temperature sensor is to be used, the desired breaking point needs to be broken first, so that the cover section can be removed in order to open the receiving region. This is therefore particularly advantageous, since the stator of the electrical machine is often impregnated in order to achieve electrical insulation. For this purpose, resin or another plastic is applied to the stator by means of an impregnation tool. This resin can likewise reach into the receiving region and lead to a poor contact between the temperature sensor and the receiving region, which can distort the temperature measurement. Furthermore, there can be a risk of: the preferably existing, previously described spring effect of the receiving region is prevented, so that on the one hand the temperature sensor can no longer be held in a force-fitting manner, but on the other hand there is also the risk that tolerance compensation can no longer be reliably carried out with different temperature sensors. This also leads to degradation and/or distortion of the measured temperature. In contrast, the resin is prevented by the cover section from being able to penetrate into the receiving region or into the gap between the receiving region and the surrounding region of the jacket. Therefore, the above-described adverse effects are reliably prevented. If the stator is completely impregnated, the cover section can be removed by breaking off the desired breaking point, so that the temperature sensor can be inserted.

Preferably, the electrical conductor of the winding has an electrical conductor element for producing an electrical plug-in winding and at least one electrical connection element. The electrical connection element serves as a star point for the electrical plug winding. Advantageously, the fastening region is mounted at the electrical connection element in a form-fitting and/or force-fitting and/or material-fitting manner. It is particularly advantageous if the fastening region is welded or soldered to the electrical connection element. In particular, the electrical connection element is part of the winding head.

In an alternative preferred embodiment, it is also provided that the electrical conductor of the winding has conductor elements for producing a plug-in winding, wherein the fastening region is fastened directly to at least one of the conductor elements. Preferably, the fastening region is fastened to the conductor element in a form-fitting and/or force-fitting and/or material-fitting manner. In contrast to the aforementioned alternatives, this is advantageous, in particular, when no star-shaped interconnection structure and thus no connecting element as described above are provided. Particularly preferably, the fastening region is welded and/or soldered to the conductor element. In other respects, the same advantages as described above result. In particular, the temperature measurement can be carried out at the winding head by means of the fastening region, while the temperature sensor is located at a distance from the winding head, where it can be replaced simply and without difficulty.

Particularly preferably, the fastening region and the electrical conductor fastened thereto are at least partially surrounded by a common injection molding envelope. This injection molding encapsulation serves in particular for electrical insulation and for shielding the injection molded region from external influences. In particular, when this electrical conductor is a connecting element as described above, the injection-molding of the electrical conductor is a common process. This conventional process is therefore not hampered by the installation of the sensor holder, and an additional encapsulation of at least the fastening region of the sensor holder can be achieved.

Preferably, the receiving region is elastically sprung. Particularly advantageously, the receiving region is hollow-cylindrical. In this way, the temperature sensor can be held in a force-fitting manner. For this purpose, the temperature sensor, which is in particular cylindrically configured, can be pushed into the hollow cylinder of the receiving region. The insertion of the temperature sensor into the receiving region causes an elastic expansion of the receiving region, as a result of which an elastic restoring force acts on the temperature sensor, so that this temperature sensor is held in a force-fitting manner. On the one hand, the temperature sensor can therefore be replaced simply and without effort, and on the other hand it can be held in an optimized manner and mounted for optimized temperature transmission.

The invention further relates to an electric machine. The motor has a stator and a rotor as previously described. The stator is mounted at the housing. The rotor can be driven by the stator and is supported by a bearing assembly at a bearing carrier, wherein the bearing carrier is mounted at the housing. In particular, the bearing assembly comprises a rolling bearing or a plain bearing, wherein the bearing assembly serves to support the rotor at a bearing carrier. In particular, an opening is provided in the bearing support, so that the winding head can be accessed in particular through this opening. The sensor holder, in particular the receiving region, projects into the opening or through the opening. Particularly advantageously, the sensor holding device, in particular the receiving region, protrudes through this opening. Preferably, the sensor holding means passes through the opening. The insertion through or into the opening is achieved by the sensor holding device projecting axially beyond the winding head. Therefore, the temperature sensor held by the sensor holding device can be replaced easily and without trouble. In particular, no disassembly of the bearing carrier and the efforts associated therewith are required for this purpose. Such disassembly may involve removal of at least one bearing carrier, thereby requiring disassembly of the rotor. Such efforts can be avoided due to the easy accessibility of the temperature sensor based on the sensor holding means.

Advantageously, an electrical attachment element is provided for electrically connecting the winding with a further electrical component outside the electrical machine. The electrical attachment element advantageously extends through an opening of the bearing carrier. Thus, especially in electric machines, the openings are already present. Thus, in particular: the temperature sensor is mounted at an area of the motor where the motor can be easily accessed, so that the temperature sensor can be easily replaced.

Preferably, a housing cover is provided for covering the opening and the bearing assembly. In this case, the housing cover preferably does not fulfill the carrying function at the motor at all, but merely covers the element. Due to the easy removal of the housing cover, the temperature sensor can be replaced easily and without effort, since this temperature sensor only has to be removed from the sensor holder protruding through the opening of the bearing carrier. It is likewise possible to insert a new temperature sensor into the receiving region of the sensor holder easily and without any effort.

Preferably, the housing is embodied in the form of a hollow cylinder or pot. A stator is received in a hollow cylindrical housing. The housing is covered at the end by a bearing carrier. In this case, provision is made, in particular in the case of a hollow cylinder of the housing, for bearing carriers to be arranged on both sides on the end sides. Advantageously, however, only one bearing carrier has the described opening through which the temperature sensor projects. However, it is also possible to install at least one temperature sensor in each case at the winding heads which are present on the end sides on both sides, wherein the aforementioned sensor holders are advantageously used in each case. In each case, it is possible to replace the temperature sensor easily and without difficulty, since the temperature sensor can be easily and without difficulty accessed.

Drawings

Embodiments of the present invention are described in detail below with reference to the accompanying drawings. Shown in the drawings are:

figure 1 is a first schematic view of an electric machine according to an embodiment of the invention,

figure 2 is a second schematic view of an electric machine according to an embodiment of the invention,

figure 3 is a third schematic view of an electric machine according to an embodiment of the invention,

figure 4 is a fourth schematic view of an electric machine according to an embodiment of the invention,

figure 5 is a schematic view of a connecting element together with a sensor holder of an electric machine according to an embodiment of the invention,

figure 6 is a schematic cross-sectional view of a connection element of a sensor holder with a motor according to an embodiment of the invention,

figures 7a to 7d are schematic views of the manufacture of a sensor holder for an electrical machine according to an embodiment of the invention,

figure 8 is a schematic view of a rotor of an electrical machine according to an embodiment of the invention,

figure 9 is another schematic view of a sensor mount of a motor according to an embodiment of the present invention,

figure 10 is yet another schematic view of a sensor mount of a motor according to an embodiment of the present invention,

figure 11 is a schematic view of a stator of an electrical machine according to an embodiment of the invention during impregnation,

figure 12 is a schematic cross-sectional view of a sensor holder with sheath,

FIG. 13 is a spatial illustration of a sensor holder with sheath, an

Fig. 14 is a schematic illustration of a connecting element with a covered sensor holder.

Detailed Description

Fig. 1 schematically shows a view of an electric machine 1 according to an embodiment of the invention. Likewise, fig. 2 and 3 show a schematic detail of the electrical machine 1 according to an embodiment of the invention. The embodiments in fig. 1 to 3 have slight variations, wherein the basic overall concept is explained in the following. Fig. 4 schematically shows the structure of the motor 1 as a schematic diagram. Fig. 1 to 4 are collectively described hereinafter.

Fig. 1 to 4 show an electric machine 1, which comprises a housing 3, wherein a stator 2 is mounted in the housing 3, which stator extends along a stator axis 100. The stator 2 is used to drive the rotor 4, wherein the stator 2 has a winding 8 with

electrical conductors

16, 21. This winding 8 forms a winding head 9 at least one end side, in particular at both end sides, of the stator 2. Temperature measurements should be made on this winding head 9.

The winding 8 is in particular designed as a plug winding. For this purpose, the

electrical conductors

16, 21 have U-shaped or I-shaped, rigid electrical conductor elements 21 which are inserted into the rotor base body and are connected to one another at the free ends. In this way, different windings 8 of the stator 2 can be realized.

As shown in fig. 1 to 3, the housing 3 is advantageously hollow cylindrical. However, a pot shape as schematically shown in fig. 4 can also be provided. In each case at least one bearing support 5 is provided, which serves for covering the housing 3 at the end. Furthermore, the bearing carrier 5 serves to receive a bearing assembly 20, by means of which the rotor 4 is supported on the bearing carrier 5. If the electric machine 1 is to be assembled, the stator 2 first needs to be installed in the housing 3, wherein the rotor 4 then needs to be introduced into the stator 2 and supported at least at one bearing carrier 5.

The bearing carrier 5 has an opening 7 through which a winding head 9 of the stator 2 can be accessed. Furthermore, the electrical attachment element 17 extends through the opening 7. The electrical attachment elements 17 serve to electrically contact the windings 8 of the stator 2 with external components outside the electrical machine 1. In the exemplary arrangement shown in fig. 1 to 3, a three-phase drive is provided, so that the electric motor 1 has three electrical attachment elements 17. By forming the opening 7 in the bearing carrier 5, an easy and uncomplicated electrical contacting can be achieved.

The opening 7 is covered by the housing cover 7 together with the bearing assembly 20. Unlike the housing 3 and the bearing support 5, this housing cover 6 does not assume a bearing function. Thus, the housing cover 6 can be detached easily and without effort, in particular in order to easily access the electrical attachment element 17 and the bearing assembly 20.

Furthermore, a sensor holder 10 is provided at the winding head 9 of the rotor 1. The sensor holder 10 serves to receive the temperature sensor 14, so that the temperature sensor 14 can be mounted easily and without difficulty on the electric machine 1. In order to mount the temperature sensor 14, only the housing cover 6 has to be removed, whereby the temperature sensor 14 can be mounted easily and without difficulty, and the temperature sensor 14 can be replaced easily and without difficulty. In particular to avoid: the bearing carrier 5 and thus the bearing assembly 20 need to be disassembled.

Simplified assemblability and replaceability of the temperature sensor 14 can be achieved by: the sensor holder 10 extends through the opening 7 from the winding head 9, where the temperature measurement is to be carried out. Thus, the sensor holder 10 projects axially beyond the stator 1 with respect to the stator axis 100. The mounting of the sensor holding device 10 can be realized in different ways, which can depend in particular on the way in which the

electrical conductors

16, 21 are interconnected into the windings 8 of the stator 2. For example, different attachments can be made depending on whether a delta interconnect or a star interconnect is present.

Fig. 5 to 7 show a variant in which a star-shaped interconnection structure is present. In this case, the

electrical conductors

16, 21 have not only the described conductor elements 21 but also the connection elements 16, wherein the connection elements 16 serve for star-like interconnection of the plug windings formed by the conductor elements 21. The connecting element 16 is preferably electrically connected directly to the above-mentioned electrical connecting element 17 in order thus to provide the three-phase motor 1 in the embodiment shown.

Fig. 5 shows a spatial view of the connecting element 16 together with the sensor holder 10. Fig. 6 shows a sectional view of the region of the connecting element 16, in particular, in which the sensor holder 10 is installed. As shown in fig. 5 and 6, the sensor holding device 10 comprises a receiving area 11 which is provided for receiving a temperature sensor 14. Adjoining the receiving region 10 is an arm region 13 which connects the receiving region 11 with the fastening region 12. At the fastening region 12, the sensor holding device 10 is coupled with a connecting element 16.

Via the connecting region 12, the sensor holder 10 is slipped onto the region of the connecting element 16 and is advantageously welded or soldered to the connecting element 16. Preferably, the metal contact is produced in such a way that there is an optimized temperature transmission between the connecting element 16 and the fastening region 12. Advantageously, since the fastening region 12, the receiving region 11 and the arm region 13 are made integrally of a metallic material, heat transfer from the connecting element 16 to the receiving region 11 can be achieved in an optimized manner. The temperature measured at the receiving region 11 therefore corresponds at least with sufficient accuracy for the invention to the temperature at the connecting element 16. Since the connection element 16 is mounted directly at the conductor of the winding head 9, the temperature of the winding head can be detected.

Advantageously, the connecting element 16 has an injection-molded envelope 18. This injection-molded encapsulation surrounds at least one subregion of the connecting element 16. In particular, the injection molding encapsulation 18 is a common injection molding encapsulation which also surrounds the fastening region 12 of the sensor holding device 10. Advantageously, therefore, the connection point between the sensor holding device 10 and the connecting element 16 is protected from external influences.

For electrical insulation and for protection from external influences, the receiving region 11 is advantageously surrounded by a jacket 15. The receiving region 11 is designed as a hollow cylinder and preferably enables a force-fitting reception of the temperature sensor 14. This means that the hollow cylindrical receiving region 11 is designed to be sprung such that the expansion of the receiving region 11 is achieved by inserting the cylindrical temperature sensor 14. An elastic restoring force is thus generated, by means of which the temperature sensor 14 is held in a force-fitting manner. This applies in particular to different dimensions of the temperature sensor 14, so that tolerance compensation can be achieved. Thereby, the sensor holding device 10 is adapted to different temperature sensors 14 and therefore replacement of the temperature sensors 14 can be achieved in a simple manner.

In order to be able to expand the receiving region 11, a gap remains between the jacket 15 and the outer periphery of the receiving region 11. This is described more accurately below with reference to fig. 10.

Fig. 7a to 7d show different views of the production process of the sensor holding device 10. In particular, the sensor holder 10 is manufactured as a stamped plate. Fig. 7a shows a press formed (ausgestanzt) starting material. This starting material is shaped by bending in such a way that, on the one hand, a hollow cylinder shape of the receiving region 11 is achieved and, on the other hand, the fastening region 12 is shaped as desired. As shown in fig. 7b, the fastening region 12 is designed to be slipped onto the region of the connecting element 16 and welded to this region. By means of the arm regions 13: the receiving region 11 and the fastening region 12 are configured at different locations. Fig. 7c only shows the mounting of the sheath 15. The jacket 15 serves for electrical insulation of the receiving region 11 and thus also for protecting the receiving region 11 from external influences.

Fig. 7d shows only the connection of the connecting element 16 to the sensor holder 10, in that the fastening region 12 is slipped onto a corresponding region of the fastening element 16. Welding or soldering is then advantageously carried out. Finally, a common injection-molded envelope 18 as described above can be applied.

Fig. 8 shows an alternative configuration and use of the sensor holding device 10. In this case, it is preferred to provide that no star-shaped interconnection structure is present, so that the

conductors

16, 21 also do not have a connecting element 16 as described above. In this case, the sensor holder 10, in particular the fastening region 12, is advantageously welded or soldered directly to the conductor element 12 of the winding 8. For this purpose, fig. 9 and 10 show different configurations of the sensor holding device 10. Here, the holding is essentially divided into a fastening region 12, an arm region 13 and a receiving region 11. However, at least the fastening region 12 is configured in a different manner in order to be able to achieve a corresponding fastening at the conductor element 21.

Furthermore, a gap X can be seen in fig. 10, which remains between the jacket 15 and the receiving region 11. When the temperature sensor 14 is pushed in, the receiving region 11 can be expanded by this gap X. A force-locking retention of the temperature sensor 14 is thus possible by the elastic restoring force of the receiving region 11. The receiving area 11 is elastically deformable independently of the sheath 15.

Fig. 11 to 14 show only a further alternative of the sensor arrangement 10. Thus, in fig. 11 is shown: the stator 2 is impregnated by means of an impregnation tool 19, preferably by means of a resin. In this way, the stator 2 can be electrically insulated. In order to prevent the resin from penetrating into the receiving region 11 and/or the gap X, the jacket 15 is modified. To this end, the sheath 15 has a cover section 15a, a surrounding region 15b and a desired breaking point 15c located therebetween. The surrounding area 15b here assumes the same function as that shown in the preceding figures and described above. This means that the surrounding region 15b electrically insulates the receiving region 11 and shields it in particular from external influences.

The cover section 15a serves to close the receiving region 11. If impregnation is carried out by means of the impregnation tool 19, resin is prevented from being able to penetrate into the receiving region 11 and/or into the interspace X. Likewise, other foreign bodies are prevented from penetrating into the gap X and/or the receiving area 11. This is shown in particular in fig. 12 and 13.

Conversely, if the temperature sensor 14 is to be introduced into the receiving region 11, the cover section 15a can be removed by breaking off the desired breaking point 15c, as shown in fig. 14. In this way, a simple modification of the jacket 15 can be used to achieve immersion protection. The entire sheathing, including the cover portion 15a, the encircling region 15b and the desired breaking point 15c, is applied to the receiving region 11 in a collective manner and is thus impregnated by means of the impregnation tool 19. Finally, only the desired breaking point 15c needs to be broken.

Claims

1. Stator (2) of an electrical machine (1), the stator having:

a stator axis (100) of the stator,

an electrical winding (8) having electrical conductors (16, 21) which form a winding head (9) on each end side of the stator (2), and a sensor holder (10) having a metallic receiving region (11) for receiving a temperature sensor (14) and a metallic fastening region (12),

wherein the fastening region (12) is mounted at least one electrical conductor (16, 21) of the winding head (9),

characterized in that the receiving region (11) projects in an axial direction with respect to the stator axis (100) relative to the winding head (9).

2. Stator (2) according to claim 1, characterized in that an arm region (13) is arranged between the fastening region (12) and the receiving region (11), which arm region extends at least partially in a radial direction with respect to the stator axis (100).

3. Stator (2) according to one of the preceding claims, characterized in that the fastening region (12) of the sensor holder (10) and the receiving region (11) of the sensor holder (10) are constructed in one piece and are in particular embodied as stamped and bent parts.

4. Stator (2) according to one of the preceding claims, characterized in that the receiving region (11) has a jacket (15), which is embodied in particular as an electrical insulator and/or is made of plastic.

5. Stator (2) according to claim 4, characterized in that the jacket (15) has a cover section (15 a) for closing the receiving region (11), a surrounding region (15 b) for surrounding the receiving region (11) and a desired breaking point (15 c) located therebetween, so that the cover section (15 a) can be removed by breaking off the desired breaking point (15 c) for opening the receiving region (11).

6. Stator (2) according to one of the preceding claims, characterized in that the electrical conductors (16, 21) have electrical conductor elements (21) for producing an electrical plug winding and at least one electrical connection element (16) which forms a star point of the electrical plug winding, wherein the fastening region (12) is mounted at the electrical connection element (16).

7. The electrical machine (1) according to any one of claims 1 to 5, characterised in that the conductors (16, 21) have conductor elements (21) for producing a plug winding, wherein the fastening region (12) is fastened at least one conductor element (12).

8. The electrical machine (1) according to claim 6 or 7, characterized in that the fastening region (12) surrounds the conductor (16, 21) to which it is fastened at least in sections, and wherein advantageously the fastening region (12) and the conductor (16, 21) to which it is fastened are at least partially surrounded by a common injection molding envelope (18).

9. Stator (2) according to one of the preceding claims, characterized in that the receiving region (11) is elastically spring-mounted, in particular hollow-cylindrical, in order to hold the temperature sensor (14) in a force-fitting manner.

10. Electric machine (1) having a housing (3) in which a stator (2) according to one of the preceding claims is mounted, having a rotor (4) which can be driven by the stator (2) and which is supported by a bearing assembly (20) at a bearing carrier (5) mounted at the housing (3), wherein the bearing carrier (5) has an opening (7), and wherein the sensor holding device (10), in particular the receiving region (12), protrudes into the opening (7) or through the opening (7).

11. The electrical machine (1) according to claim 9, characterized in that at least one electrical attachment element (17) for connecting the winding (8) with a further electrical component outside the electrical machine (1) extends through the opening (7).

12. The electrical machine (1) according to claim 10 or 11, characterized by a housing cover (6) by means of which the opening (7) and the bearing assembly (20) are covered.

13. The electrical machine (1) according to any of claims 10 to 12, characterized in that the housing (3) is embodied as a hollow cylinder or pot, wherein the bearing carrier (5) is mounted on an end side of the housing (3).