Stator, slot-closure means, and temperature-measuring arrangement

Abstract

The invention relates to a stator (1) for an electric machine (2), comprising a stator body (3) having a plurality of circumferentially distributed stator teeth (4) and stator slots (5) formed between the stator teeth (4) and extending in the axial direction through the stator body (3), wherein: stator windings (6) are arranged in the stator slots (5) and the stator slots (5) comprise, along their radial extension at their radially outer end, a slot base (7) and, at their radially inner end, a slot opening (8); at least one of each of the slot openings (8) is closed by a slot-closure means (9) such that the stator windings (6) are held in the stator slot (5); a temperature sensor (10) is arranged in and / or on at least one of the slot-closure means and the temperature sensor (10) comprises at least one electrical conductor (12), by means of which the temperature sensor (10) can be coupled to a control unit (17); the electrical conductor (12) extends substantially axially on and / or through the slot-closure means (9) and projects out of the slot-closure means (9); the slot-closure means (9) provided with a temperature sensor (10) protrudes axially from a winding head (13) formed by the stator windings (6).

Description

[0001] Stator, slot closure means and temperature measuring arrangement

[0002] The present invention relates to a stator for an electrical machine, comprising a stator body with a plurality of stator teeth arranged circumferentially and stator slots formed between the stator teeth and extending in the axial direction through the stator body, wherein stator windings are arranged in the stator slots, and the stator slots have a slot base at their radially outer end along their radial extension and a slot opening at their radially inner end, or and the stator slots have a slot base at their radially inner end along their radial extension and a slot opening at their radially outer end, wherein at least one of the slot openings is closed by a respective slot closure means, so that the stator windings are held in the stator slot, wherein a temperature sensor is arranged in and / or on at least one of the slot closure means, and the temperature sensor has at least one electrical conductor,by means of which the temperature sensor can be coupled to a control unit, wherein the electrical conductor extends substantially axially along and / or through the slot closure means and protrudes from the slot closure means. The invention further relates to a slot closure means and a temperature measuring arrangement.

[0003] Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.

[0004] A detailed description of an electric drive can be found in an article in the magazine ATZ 113th year, 05 / 2011, pages 360-365 by Erik Schneider, Frank Fickl, Bernd Cebulski and Jens Liebold with the title: Highly integrated and flexible electric drive unit for electric vehicles. This article describes a drive unit for one axle of a vehicle which comprises an electric motor which is arranged concentrically and coaxially to a bevel gear differential, with a switchable 2-speed planetary gear set being arranged in the power train between the electric motor and bevel gear differential, which is also positioned coaxially to the electric motor or the bevel gear differential or spur gear differential. The drive unit is very compact and, thanks to the switchable 2-speed planetary gear set, allows a good compromise between climbing ability, acceleration and energy consumption.Such drive units are also referred to as e-axles or electrically operated drive trains.

[0005] In addition to purely electric drivetrains, hybrid drivetrains are also known. Such drivetrains in hybrid vehicles typically comprise a combination of an internal combustion engine and an electric motor, enabling purely electric operation—for example, in urban areas—while maintaining sufficient range and availability, especially for long-distance journeys. Furthermore, in certain operating situations, it is possible to use both the internal combustion engine and the electric motor simultaneously.

[0006] In the development of electric motors intended for electric axles or hybrid modules, there is a continuing need to increase their power densities, making the necessary cooling of the electric motors increasingly important. Due to the necessary cooling performance, hydraulic fluids, such as cooling oils, have become the preferred solution in most concepts for dissipating heat from the thermally stressed areas of an electric motor.

[0007] For effective thermal management of such an electrical machine, it is necessary to determine various temperatures at different locations within the electrical machine. Temperature measurements should be as accurate as possible, particularly at expected thermal hotspots, to prevent local or general thermal overload of the electrical machine through the control of the electrical machine and / or its cooling system.

[0008] Furthermore, there is a continuing need to be able to manufacture electrical machines for the automotive sector particularly cost-effectively and in a way that is easy to install. The object of the invention is therefore to provide a stator for an electrical machine that reduces or completely eliminates the disadvantages known from the prior art and enables cost-effective and accurate temperature measurement in thermally stressed areas of the stator, with this temperature measurement also being designed to be particularly easy to install. Furthermore, the object of the invention is to realize an improved slot closure means and an improved temperature measuring arrangement for a stator of an electrical machine.

[0009] This object is achieved by a stator for an electrical machine, comprising a stator body with a plurality of stator teeth arranged in a circumferentially distributed manner and stator slots formed between the stator teeth and extending in the axial direction through the stator body, wherein stator windings are arranged in the stator slots, and the stator slots have a slot base at their radially outer end along their radial extension and a slot opening at their radially inner end, or and the stator slots have a slot base at their radially inner end along their radial extension and a slot opening at their radially outer end, wherein at least one of the slot openings is closed by a respective slot closure means, so that the stator windings are held in the stator slot, wherein a temperature sensor is arranged in and / or on at least one of the slot closure means, and the temperature sensor has at least one electrical conductor,by means of which the temperature sensor can be coupled to a control unit, wherein the electrical conductor extends substantially axially on and / or through the slot closure means and protrudes from the slot closure means, wherein the slot closure means provided with a temperature sensor protrudes axially from a winding head formed by the stator windings.

[0010] This provides the advantage that the slot closure element, in which the temperature sensor is located, is axially extended so that it is slightly raised above the winding head. This allows for particularly simple and intuitive installation and connection of the temperature sensor, as the corresponding connection practically "jumps out" at the installer on the protruding slot closure element and is therefore very easy to identify. This can shorten installation time and increase the reliability of the temperature sensor.

[0011] Another advantage is that, on the one hand, the installation effort for the temperature sensor can be kept to a minimum by integrating it into or on the slot closure element, which can also have a positive impact on installation costs. Furthermore, it is possible to place the temperature sensor very close to potential thermal hot spots, enabling fast and precise sensor response and high control dynamics. Furthermore, corresponding motors can be easily equipped with appropriately integrated temperature sensors for testing purposes, and their thermal properties can be determined easily and reliably.

[0012] It is understood that a plurality of electrical conductors may also run on and / or through the slot closure means. It is particularly preferred for two electrical conductors to run on and / or through the slot closure means. A temperature sensor most preferably has two electrical conductors. It may also be preferred to provide at least a second temperature sensor in a slot closure means in order to form a redundant temperature measurement system and / or to be able to perform a temperature measurement at two different locations in the stator. In this context, it is preferred for each temperature sensor to have two electrical conductors.

[0013] An electrical conductor can be, for example, a circuit track or a cable.

[0014] The stator according to the invention is preferably designed for use in a radial flux machine. A stator for a radial flux machine is typically cylindrical and generally consists of electrically insulated, layered, and stacked laminations. Distributed around the circumference, grooves are recessed into the electrical lamination, running essentially parallel to the rotor shaft. These grooves accommodate the stator winding or parts of the stator winding. The stator can also be designed for an electrical machine configured as an external rotor or internal rotor.

[0015] Stator windings are embedded in the stator slots of the stator according to the invention. A stator winding is an electrically conductive conductor whose length is significantly greater than its diameter. The stator winding can, in principle, have any cross-sectional shape. Rectangular cross-sectional shapes are preferred, as these allow high packing and, consequently, power densities to be achieved. A stator winding is most preferably made of copper. A stator winding preferably has insulation. To insulate the stator winding, for example, mica paper, which for mechanical reasons can be reinforced by a glass fabric carrier, can be wound in strip form around one or more stator windings, which are impregnated with a curing resin. In principle, it is also possible to use a curable lacquer layer without mica paper to insulate a stator winding.

[0016] The stator according to the invention further comprises a stator body. The stator body can be formed in one piece or in multiple pieces, in particular segmented. A one-piece stator body is characterized in that the entire stator body is formed in one piece over its circumference. The stator body is generally formed from a plurality of stacked laminated electrical sheets, each of the electrical sheets being formed to form a closed circular ring. A segmented stator body is characterized in that it is constructed from individual stator segment parts. The stator body can be constructed from individual stator teeth or stator tooth groups, each individual stator tooth or each individual stator tooth group being formed from a plurality of stacked laminated electrical sheets, each of the electrical sheets being designed as a stator segment sheet part.

[0017] The stator body is preferably formed from one or more stator lamination stacks. A stator lamination stack is understood to be a plurality of laminated individual laminations or stator laminations, usually made of electrical steel, which are stacked and stacked together to form a so-called stator lamination stack. The individual laminations can then be held together in the lamination stack by gluing, welding, or screwing.

[0018] The stator teeth of the stator are preferably formed in the stator body. Stator teeth are components of the stator body that are circumferentially spaced, tooth-like, radially inwardly (inner rotor) or outwardly (outer rotor) directed parts of the stator body. An air gap for the magnetic field is formed between their free ends and a rotor body. The air gap is the gap existing between the rotor and the stator. In a radial flux machine, this is a substantially circular gap with a radial width that corresponds to the distance between the rotor body and the stator body.

[0019] The stator is particularly intended for use in an electric machine within a drive train of a motor vehicle. The electric machine is particularly intended for use within a drive train of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h and in particular greater than 100 km / h can be achieved. Particularly preferably, the electric machine has an output greater than 30 kW, preferably greater than 50 kW and in particular greater than 70 kW. It is further preferred that the electric machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, most particularly preferably greater than 12,500 rpm.

[0020] A temperature sensor, as defined in this application, is an electrical or electronic component that provides an electrical signal as a measure of a temperature acting on the temperature sensor. A temperature sensor can, for example, be selected from the group of thermocouples, thermistor temperature sensors, PTC temperature sensors, semiconductor temperature sensors, ferromagnetic temperature sensors, pyroelectric temperature sensors, fiber optic temperature sensors, and / or pyrometers.

[0021] Particularly preferably, the temperature sensor is configured as a thermistor temperature sensor, which is also referred to as an NTC resistor or NTC thermistor (negative temperature coefficient thermistor).

[0022] The temperature sensor can be connected to the slot closure means in a form-fitting and / or force-fitting and / or materially bonded manner, in particular also permanently. For example, form-fitting means can be provided on the slot closure means, which ensure a form-fitting fixation of the temperature sensor on and / or in the slot closure means. In this context, it is particularly preferred to design the form-fitting means as a clip connection into which the temperature sensor can be clipped and held captively. Furthermore, it is preferred in this context for the form-fitting means to be formed monolithically with the slot closure means, for example, by a plastic injection molding process.

[0023] Preferably, the slot closure means is made of a material having a thermal conductivity of greater than 0.1 W / (m*K), preferably greater than 1.0 W / (m*K), most preferably greater than 10 W(m*K), whereby particularly short response times can be achieved in the temperature sensor.

[0024] According to an advantageous embodiment of the invention, it can be provided that the slot closure means is made of plastic and that the temperature sensor is at least partially, preferably completely, enclosed by plastic. The advantage of this embodiment is that the temperature sensor is thus protected from mechanical and / or chemical influences. In principle, however, it would also be conceivable for the temperature sensor to be positioned openly in the slot closure means, at least on the side facing the slot base of the stator slot, and thus, for example, to directly contact a cooling oil located in the stator slot and / or a stator winding. According to a further preferred development of the invention, it can also be provided that the slot closure means is manufactured using a plastic injection molding process, in which the temperature sensor is inserted into a corresponding injection mold prior to injection molding, which is particularly advantageous from a manufacturing perspective.

[0025] Furthermore, according to a likewise advantageous embodiment of the invention, the slot closure means can have a sensor groove into which the temperature sensor is inserted and held in the sensor groove by means of a fixing material. The advantageous effect of this embodiment is that, for example, all slot closure means used in a stator can be constructed from the same parts, with a temperature sensor only being inserted into the sensor groove or grooves for whose slot closure means a temperature measurement is to be performed. The high proportion of identical parts can positively influence manufacturing costs.

[0026] The sensor groove can be formed, in particular, on the surface of the groove closure means facing the groove base. Furthermore, it is preferred that the sensor groove terminates at a distal end of the longitudinal extension of the groove closure means.

[0027] According to another particularly preferred embodiment of the invention, the slot closure means may also have a sensor channel that is at least partially closed around its circumference, into which the temperature sensor is inserted and held in the sensor channel by means of a fixing material. For example, the sensor channel may be formed by a bore in the slot closure means.

[0028] Furthermore, the invention can also be further developed such that the fixing material is different from the material of the slot closure means. The fixing means is preferably made of a material with a thermal conductivity of greater than 0.1 W / (m*K), preferably greater than 1.0 W / (m*K), very particularly preferably greater than 10 W(m*K), whereby particularly short response times can be achieved in the temperature sensor. Furthermore, the material of the slot closure means can thereby have a thermal conductivity which is different from the thermal conductivity of the fixing means. In particular, the material of the slot closure means can have a thermal conductivity which is lower than the thermal conductivity of the fixing means.

[0029] The fixing material can fill the sensor groove or the sensor channel completely or only in sections. It is essential that the fixing material fixes the temperature sensor and / or the cables connected to the temperature sensor in the sensor groove or the sensor channel. In a likewise preferred embodiment of the invention, it can also be provided that the fixing material is a potting compound, in particular a potting compound made of a plastic, and / or an adhesive. According to a further advantageous embodiment of the invention, it can be provided that the at least one electrical conductor is fixed in and / or on the slot closure means by means of a potting compound. This has the advantage that the electrical conductor and the temperature sensor can be potted together, which is particularly advantageous from a manufacturing perspective.

[0030] It may also be advantageous to further develop the invention such that the fixing material is identical to the material of the slot closure means, wherein the fixing of the temperature sensor in and / or on the slot closure means is realized by deforming the slot closure means. For example, it would be possible to locally heat a slot closure means in the region of the accommodation of the temperature sensor and / or the cable connected to the temperature sensor and then deform it, wherein the material displacement on the slot closure means fixes the temperature sensor and / or the cable. A suitable deformation method for this would be, for example, caulking or bending.

[0031] According to a further preferred embodiment of the subject matter of the invention, it can be provided that the slot closure means preferably closes the slot opening over its entire axial extent, and the temperature sensor is arranged approximately centrally on and / or in the slot closure means along the axial extent. This ensures that thermal hot spots, which frequently occur in the middle of the axial extent, are clearly visible. Furthermore, the axial positioning of the temperature sensor can be implemented in this way in a very easy and secure manner.

[0032] In principle, it would of course be possible for the slot closure means not to extend completely over the entire axial extent of a stator slot, but to close it only in sections.

[0033] Finally, the invention can also be advantageously designed such that the temperature sensor has a cable by means of which the temperature sensor can be coupled to a control unit, wherein the cable extends axially to and / or through the slot closure means and protrudes from the slot closure means, whereby an assembly-friendly connection of the temperature sensor to a control unit can be achieved after the slot closure means has been inserted into the stator.

[0034] A control unit, as can be used in connection with the present invention, serves, in particular, for the electronic control and / or regulation of one or more technical systems of an electrical machine, in particular an electrical machine in a drive train of a motor vehicle. In particular, a control unit can be provided for the control and / or regulation of a cooling system of an electrical machine.

[0035] A control unit has, in particular, a wired or wireless signal input for receiving, in particular, electrical signals, such as sensor signals, preferably signals from a temperature sensor. Furthermore, a control unit also preferably has a wired or wireless signal output for transmitting, in particular, electrical signals, for example, to electrical actuators or electrical consumers of a motor vehicle.

[0036] Within the control unit, control operations and / or

[0037] Control operations are performed. It is particularly preferred that the control unit comprises hardware configured to execute software. The control unit preferably comprises at least one electronic processor for executing program sequences defined in software.

[0038] The control unit may further comprise one or more electronic memories in which the data contained in the signals transmitted to the control unit can be stored and read again. Furthermore, the control unit may comprise one or more electronic memories in which data can be stored in a modifiable and / or non-modifiable manner.

[0039] A control unit can comprise a plurality of control units, which are arranged, in particular, spatially separated from one another in the motor vehicle. Control units are also referred to as Electronic Control Units (ECUs) or Electronic Control Modules (ECMs) and preferably have electronic microcontrollers for performing computing operations for processing data, particularly preferably using software. The control units can preferably be networked with one another, enabling wired and / or wireless data exchange between control units. In particular, it is also possible to network the control units with one another via bus systems present in the motor vehicle, such as the CAN bus or LIN bus.

[0040] The object of the invention is further achieved by a slot closure means of a stator of an electrical machine, wherein a temperature sensor for coupling to a control unit is arranged in and / or on at least one of the slot closure means.

[0041] The slot closure means can preferably also be formed by an additive manufacturing process. In this context, it is particularly preferred that the temperature sensor is also formed together with the slot closure means using an additive manufacturing process. It is further particularly preferred that the electrical lines for connection to the control unit are also formed together with the slot closure means and the temperature sensor using an additive manufacturing process. In this context, the electrical lines can in particular be connected to an electrical connection device of the slot closure means, wherein the electrical connection device is designed, for example, as an electrical coupling for receiving a plug device.It is highly preferred that the connecting device is formed by means of an additive manufacturing process together with the slot closure means, the temperature sensor and the electrical lines.

[0042] An additive manufacturing process is often also referred to as a generative manufacturing process or a three-dimensional printing process (3D printing). The additive manufacturing process enables rapid and cost-effective production of the slot closure means, as well as preferably also of the temperature sensor and / or the electrical cables and / or the electrical connection device in a single work process, whereby the production can be carried out, in particular, on the basis of computer-internal data models from a formless or form-neutral starting material using chemical and / or physical processes. An additive or generative process can be

[0043] The object of the invention is finally also achieved by a temperature measuring arrangement for a stator of an electrical machine, comprising a control unit, a temperature sensor, and a slot closure means, wherein a temperature sensor for coupling to a control unit is arranged in and / or on the slot closure means. This makes it possible, in particular, to provide a modular unit that can be prefabricated, for example, for a wide variety of stators.

[0044] According to a further preferred development of the invention, it can also be provided that the at least one electrical conductor is designed as a cable. Most preferably, the temperature sensor has two cables.

[0045] Furthermore, according to a likewise advantageous embodiment of the invention, the cable can be provided without an electrically insulating sheath. This can save costs, and it can also further simplify assembly, since stripping the cable before or during assembly is eliminated. The temperature sensor cable(s) are therefore preferably cast into the slot closure means without sheathing. In this case, a partition wall can also preferably be provided in the slot closure means, for example, which spatially separates uninsulated cables from one another.

[0046] According to a further particularly preferred embodiment of the invention, it can be provided that the slot closure means has a groove within which the at least one electrical conductor runs, which is preferred from a manufacturing point of view, since the insertion of the cable(s) into the groove can be safely controlled and visually well controlled.

[0047] Furthermore, the invention can also be further developed such that the part of the at least one electrical conductor protruding from the slot closure means rests at least partially against an outer circumferential surface of the slot closure means, thereby simplifying contact by sliding a corresponding plug onto the slot closure means. At one of the axial ends of the slot closure means, the cable(s) emerging from the slot closure means in the axial direction can thus preferably be bent and guided laterally along the outer circumferential surface of the slot closure means for a short distance in the opposite direction.

[0048] In a likewise preferred embodiment variant of the invention, it can also be provided that the lateral surface of the slot closure means is formed with a guide section for fixing the part of the at least one electrical conductor protruding from the slot closure means.

[0049] The guide section can, for example, comprise a groove projecting into the lateral surface or a clamping element projecting from the lateral surface into which the electrical conductor can be clamped.

[0050] This ensures that the electrical conductor(s) occupy a defined position on the jacket surface and cannot be brought into unintentional electrical contact with one another, particularly when a plug is plugged onto the slot closure means.

[0051] It may also be advantageous to further develop the invention such that the part of the at least one electrical conductor protruding from the slot closure means can be contacted by means of a plug that can be plugged onto the slot closure means, whereby assembly can be further improved by simply plugging it in. The plug is, in particular, electrically connected to the control unit. Particularly preferably, the plug and / or the slot closure means comprises a sealing means by means of which the electrical contact area between the plug and the part of the at least one electrical conductor protruding from the slot closure means can be sealed from the surroundings of the plug, in particular, can be sealed in a liquid-tight manner.

[0052] To manufacture the stator, a slot-locking wedge with a temperature sensor is inserted into a stator slot. After the stator is completely manufactured and, if necessary, installed in a housing, the connector, which can be connected to a cable, for example, is plugged onto the slot-locking wedge with the temperature sensor, thus contacting the temperature sensor and connecting it to the stator's control unit.

[0053] In order to always guarantee correctly polarized contact of the temperature sensor, the slot closure means and / or the plug can preferably have a Poka Yoke feature, which only allows a defined plugging of the plug onto the slot closure means in a predefined position.

[0054] The invention will be explained in more detail below with reference to figures without limiting the general inventive concept.

[0055] It shows: Figure 1 a schematic cross-sectional view through an electrical machine,

[0056] Figure 2 shows a schematic detailed view of a stator slot in a cross-sectional view,

[0057] Figure 3 shows a stator in a perspective view,

[0058] Figure 4 shows a slot closure means in a perspective view,

[0059] Figure 5 shows a slot closure means in a perspective view, and

[0060] Figure 6 shows a slot closure means with a plug in a perspective view.

[0061] Figure 1 shows a stator 1 of an electrical machine 2, comprising a stator body 3 with a plurality of circumferentially distributed stator teeth 4 and stator slots 5 formed between the stator teeth 4 and extending in the axial direction through the stator body 3. Stator windings 6 are arranged in the stator slots 5. The stator slots 5 have a slot base 7 at their radially outer end along their radial extension and a slot opening 8 at their radially inner end. The slot openings 8 are each closed by a slot closure means 9, so that the stator windings 6 are held in the stator slot 5.

[0062] This is also particularly clearly visible in Figure 2, which shows the stator region of a stator slot 5 in a detailed view. It is particularly clear here that a temperature sensor 10 is arranged in one of the slot closure means 9. In the exemplary embodiment shown, the slot closure means 9 is made of plastic, and the temperature sensor 10 is at least partially, preferably completely, enclosed by plastic. To accommodate the temperature sensor 10, the slot closure means 9 has a sensor channel that is at least partially closed around its circumference, into which the temperature sensor 10 is inserted and held in the sensor channel 13 by means of a fixing material.

[0063] As an alternative to a sensor channel 13, the slot closure means 9 can also have a (sensor) groove 16, into which the temperature sensor 10 is inserted and held in the (sensor) groove 16 by means of a fixing material. This embodiment is shown in Figures 3-6.

[0064] The fixing material shown in Figures 5-6 can be, for example, a potting compound, in particular a potting compound made of a plastic, and / or an adhesive. In principle, it is also possible for the fixing material to be identical to the material of the slot closure means 9, with the fixing of the temperature sensor 10 in and / or on the slot closure means 9 being realized by deforming the slot closure means 9.

[0065] Figure 3 shows a stator 1 for an electrical machine 2, in which one of the slot openings 8 is closed by a slot closure means 9, so that the stator windings 6 are held in the stator slot 5, and wherein a temperature sensor 10 is arranged in and / or on the slot closure means 9, which temperature sensor has at least one electrical conductor 12, by means of which the temperature sensor 10 can be coupled to a control unit 17. The electrical conductor 12 extends essentially axially on and / or through the slot closure means 9 and protrudes from the slot closure means 9, which can also be clearly seen from the combination of Figure 3 with Figures 4-6.

[0066] The slot closure means 9 provided with a temperature sensor 10 protrudes axially from a winding head 13 formed by the stator windings 6, so that assembly can be made particularly easy.

[0067] Figure 4 shows that the slot closure means 9 has a groove 16 within which the two electrical conductors 12 extend. Figure 5 shows that these electrical conductors 12 are fixed in and / or to the slot closure means 9 by means of a potting compound 14. In the embodiments shown, the electrical conductors 12 are each designed as cables 15 that do not have an electrically insulating sheath.

[0068] Figure 5 shows that the part of the electrical conductors 12 protruding from the slot closure means 9 rests, at least in sections, against an electrically non-conductive, outer surface 17 of the slot closure means 9. The surface 17 of the slot closure means 9 has a guide section 18 for securing the part of the electrical conductors 12 protruding from the slot closure means 9, as indicated in Figure 6. Figure 6 also shows that the part of the electrical conductors 12 protruding from the slot closure means 9 can be contacted by means of a plug 19 that can be plugged onto the slot closure means 9. The slot closure means 9 can thus be coupled to the control unit 17 of the stator 3.

[0069] The invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be considered restrictive, but rather explanatory. The following claims are to be understood in such a way that a stated feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. Where the claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing a priority.

[0070] List of reference symbols

[0071] 1 stator

[0072] 2 electric machine

[0073] 3 Stator body

[0074] 4 stator teeth

[0075] 5 stator slots

[0076] 6 stator windings

[0077] 7 Groove base

[0078] 8 Groove opening

[0079] 9 Groove sealants

[0080] 10 Temperature sensor

[0081] 12 electrical conductors

[0082] 13 Winding head

[0083] 14 Potting compound

[0084] 15 cables

[0085] 16 grooves

[0086] 17 Control unit

[0087] 18 Guide Section

[0088] 19 plugs

Claims

Claims: Stator (1) for an electric machine (2), comprising a stator body (3) with a plurality of circumferentially distributed stator teeth (4) and stator slots (5) formed between the stator teeth (4) and extending axially through the stator body (3), wherein stator windings (6) are arranged in the stator slots (5), and the stator slots (5) have a slot base (7) at their radially outer end and a slot opening (8) at their radially inner end along their radial extent, or and the stator slots (5) have a slot base (7) at their radially inner end and a slot opening (8) at their radially outer end along their radial extent, wherein at least one of the slot openings (8) is closed by a slot closure means (9) so that the stator windings (6) are held in the stator slot (5), wherein a temperature sensor (10) is arranged in and / or on at least one of the slot closure means (9).and the temperature sensor (10) has at least one electrical conductor (12) by means of which the temperature sensor (10) can be coupled to a control unit (17), wherein the electrical conductor (12) extends substantially axially on and / or through the slot closure means (9) and projects out of the slot closure means (9), characterized in that the slot closure means (9) provided with a temperature sensor (10) projects axially from a winding head (13) formed by the stator windings (6). Stator (1) according to claim 1, characterized in that the at least one electrical conductor (12) is fixed in and / or on the slot closure means (9) by means of a potting compound (14). Stator (1) according to one of the preceding claims, characterized in that, which at least one electrical conductor (12) is designed as a cable (15).

4. Stator (2) according to claim 3, characterized in that the cable (15) does not have an electrically insulating sheath.

5. Stator (1 ) according to one of the preceding claims, characterized in that the slot closure means (9) has a slot (16) within which the at least one electrical conductor (12) runs.

6. Stator (1 ) according to one of the preceding claims, characterized in that the part of the at least one electrical conductor (12) projecting from the slot closure means (9) bears at least sectionally against an outer surface (17) of the slot closure means (9).

7. Stator (2) according to claim 6, characterized in that the outer surface (17) of the slot closure means (9) is formed as a guide section (18) for fixing the part of the at least one electrical conductor (12) projecting from the slot closure means (9).

8. Stator (1 ) according to one of the preceding claims, characterized in that the part of the at least one electrical conductor (12) projecting from the slot closure means (9) can be contacted by means of a plug (19) that can be plugged onto the slot closure means (9).

9. Slot closure means (9) of a stator (1 ) of an electric machine (2) characterized in that a temperature sensor (10) for coupling with a control unit (17) is arranged in and / or on at least one of the slot closure means (9). Temperature measuring arrangement for a stator (1 ) of an electric machine (2) comprising a control unit (17), a temperature sensor (10) and a slot closure means (9), wherein a temperature sensor (10) is arranged in and / or on the slot closure means (9) for coupling with the control unit (17).

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