Stator arrangement for an electric machine and method for the production thereof

Abstract

The invention relates to a stator arrangement (20) and a method for the production thereof. The stator arrangement (20) has a stator body (32) with a stator core (21) which is completely or partially coated by an electrically insulating coating (31). A temperature-sensitive measuring conductor path (37) is arranged in or on the cladding layer and is implemented integrally with the cladding layer (31). For this purpose, an MID manufacturing method can be used, for example. The at least one temperature-sensitive measuring conductor path (37) has a temperature-dependent resistance (RT). It is preferably arranged at a measurement position (M) between the teeth (23) of the stator body (32) and the stator winding (29) wound onto the teeth (23).

Description

Technical Field

[0001] The invention relates to a stator arrangement for an electrical machine, in particular an electric motor, and to a method for producing the same. Background Art

[0002] WO 2020 / 167124 A1 discloses an electric motor in which the ohmic winding resistance of a stator winding is determined. The winding resistance can then be used, for example, to determine the rotational speed of the electric motor by measuring the motor current. For example, the motor temperature can also be determined from the winding resistance, for example in order to protect the electric motor from excessive temperatures. In order to determine the temperature-dependent winding resistance, a temperature sensor is used. In addition, there can also be voltage sensors and current sensors, wherein all sensors communicate with an evaluation unit, in which the temperature-dependent winding resistance can then be determined.

[0003] WO 2022 / 131455 A1 also describes a measurement method for determining the resistance of a motor winding. Based on the determined winding resistance, the winding temperature can then be calculated.

[0004] DE 10 2007 046 227 A1 discloses an electric motor. The stator arrangement is at least partially made using MID technology (molded interconnect device). This makes it easier to combine commonly used components, such as an annular circuit board of an electric motor, control electronics, sensor support and base plate, so as to reduce assembly costs and production costs. For example, EP 2589817 B1 also proposes MID technology for producing a housing part with conductor paths for a pump unit.

[0005] Starting from the prior art, it can be considered that the object of the invention is to provide a stator arrangement which allows an exact temperature determination and which can thereby at the same time be manufactured in a simple and economical manner. Summary of the invention

[0006] This object is achieved by a stator arrangement having the features of claim 1 and by a method having the features of claim 14 .

[0007] The stator arrangement has a stator body, which includes a stator core and a coating that partially or completely covers the stator core. The stator body is configured for attaching at least one stator winding. To this end, the stator body may include teeth around which the winding is wound. The teeth are spaced apart in the circumferential direction by winding slots.

[0008] The stator core consists of an electrically conductive material. Along a longitudinal axis (which, for example, defines the axis of rotation of the rotor), the stator core may consist of separate electrically conductive sheet metal parts and may therefore be referred to as a stator package.

[0009] A coating is applied to the stator core, which partially or completely surrounds the stator core. The coating is electrically insulating. In particular, the coating is present on the teeth in order to electrically insulate the stator winding from the stator core.

[0010] The stator arrangement also has a temperature determination device. The temperature determination device is configured to determine the temperature on the stator body. In particular, the temperature is not measured directly, but is determined indirectly based on one or more measured or otherwise determined electrical parameters. To this end, the temperature determination device comprises at least one measuring circuit branch, each of which has at least one measuring conductor path. Each measuring conductor path has a temperature-dependent resistance. The resistance can have an NTC characteristic (NTC thermistor) or a PTC characteristic (PTC thermistor). To this end, at least one measuring conductor path can include a material with suitable properties or can preferably consist exclusively of such a material.

[0011] Preferably, in each measuring circuit branch, apart from the at least one measuring conductor path, no additional electrical and / or electronic components are present.

[0012] At least one measuring conductor path is arranged on or in the covering. It is especially integrated on or in the covering so that the at least one measuring conductor path cannot be separated from the covering in a non-destructive manner. It can be said that the at least one measuring conductor path and the covering can be an integral unit.

[0013] At least one measuring conductor path can be electrically connected to an evaluation unit of the temperature determination device. For example, the evaluation unit can be arranged on a support, such as a circuit board, and can be attached to the stator body. Additional control members and / or circuit components for controlling the operation of the motor comprising the stator arrangement can also be present on the support.

[0014] According to the invention, the stator arrangement with the temperature determination device requires only a few components and can be realized as a compact, highly integrated stator arrangement. The production of the coating and the at least one measuring conductor path can be carried out very economically, for example by an MID method, such as two-component injection molding or a laser MID method. The abbreviation MID stands for the English expression "Molded Interconnected Devices". For example, laser direct structuring (LDS) or subtractive laser structuring can be used as the laser MID method.

[0015] At least one measuring conductor path is preferably arranged in the region of a surface of the stator body and / or in the region of a tooth side in a winding slot of the stator body. At least one measuring conductor path is in particular electrically insulated from the stator core, preferably by a coating. The number of measuring conductor paths and therefore the number of measuring positions at which the temperature on the stator body can be determined by a temperature determination device can be selected arbitrarily and can be varied in a simple manner. In this regard, the stator arrangement can be constructed in a highly flexible manner. Thus, the possibility is provided to detect the temperature at one or more stator windings at a position directly adjacent to the stator winding. Thus, the temperature determination is very precise. By means of the invention, measurement errors due to inappropriate or erroneous positioning of the temperature sensor (for example due to assembly errors) can be avoided in a very simple manner.

[0016] The temperature determination device is in particular configured to determine the resistance value of the at least one measuring conductor path, for example by applying an applied voltage to the at least one measuring conductor path and by determining the current flowing through the at least one measuring conductor path. Alternatively to this, the temperature determination device can also be configured to apply a current to the at least one measuring conductor path and to determine the voltage generated at the measuring conductor path. The resistance value is derived from Ohm's law. Since the temperature dependence (temperature characteristic) of the resistance of the at least one measuring conductor path is known, the temperature at the at least one measuring conductor path can be determined based on a corresponding attribution (function, table, etc.).

[0017] In the present application, the term "resistance" refers to ohmic resistance, unless otherwise indicated.

[0018] As described above, at least one measuring conductor path is inseparably connected to the coating, preferably by material bonding. Advantageously, the mechanical connection between the coating and the at least one measuring conductor path is produced during and by manufacturing the coating and / or during and by manufacturing the at least one measuring conductor path. For example, the coating can be an injection molded layer, and the at least one measuring conductor path can be manufactured on or in the coating based on the known MID method, as described above. The coating can be an injection molded conductor path holder. The at least one conductor path can be manufactured, in particular, during or subsequently by an additional process.

[0019] All existing measuring circuit branches and measuring conductor paths are present on or in the covering. The electrical connection to the evaluation unit of the temperature detection device can be realized outside the covering or on or in it. Optionally, the evaluation unit can also be arranged on the covering. In this case, the covering is an injection-molded circuit support.

[0020] Advantageously, the temperature determination device comprises a plurality of measuring conductor paths which are arranged spatially spaced apart from one another at different measuring positions on the stator body. In this way, individual temperature values ​​can be determined at a plurality of measuring positions, or an average value of the temperature can be determined for a plurality of measuring positions. This depends, for example, on how the plurality of measuring conductor paths are electrically connected to one another. Thus, the individual measuring positions are in particular positions on the stator body to which an individual stator winding on a tooth is assigned in order to determine the temperature of the stator winding.

[0021] Preferably, the temperature determination device can comprise at least one measuring circuit branch, wherein each measuring circuit branch comprises exactly one measuring conductor path or a plurality of measuring conductor paths.For each measuring circuit branch, the temperature determination device can determine a separate parameter characterizing the temperature of the measuring circuit branch.

[0022] Each measuring circuit branch can be assigned to exactly one measuring location, or different measuring conductor paths of a measuring circuit branch can be arranged at a measuring location at a distance from one another.

[0023] In all exemplary embodiments it can be advantageous if a plurality or all existing measuring conductor paths are connected in series and / or in parallel with one another.

[0024] Each measuring circuit branch has two electrical connections in order to electrically connect the measuring circuit branch to a voltage source and / or a current source. One or both of these electrical connections of each measuring circuit branch are preferably arranged in the region of a surface of the stator body in order to ensure a good position for connecting an evaluation unit of the temperature determination device. Thus, all connections are preferably present on the same surface. One connection of each measuring circuit branch can be connected to a common reference potential, in particular a ground potential, and for this purpose can optionally be connected to an electrically conductive component of the stator arrangement, for example a stator core. In this case, it is not necessary to guide the connections to the common reference potential of the measuring circuit branches to the surface of the stator body.

[0025] In a preferred embodiment, the measuring conductor path or at least one of the provided measuring conductor paths can be arranged at the following location on the stator body: - the corresponding measuring conductor paths can be arranged only in the region of the surface of the stator body; - the corresponding measuring conductor paths can be arranged only in the region of the tooth flanks in the winding slots of the stator body; The respective measuring conductor paths can be arranged in the region of two tooth flanks of a common tooth in two adjacent winding slots of the stator body; The measuring conductor path can be arranged in one section along the tooth flanks in the winding slots and in another section in the region of the surface of the stator body.

[0026] The geometry and the extension of the at least one measuring conductor path can be defined depending on the temperature to be determined. For example, the arrangement of the at least one measuring conductor path can depend on whether the temperature is to be determined at a locally defined location of the winding, such as a winding head, or whether the temperature average value is to be determined along a longer section of the winding, such as within a single winding slot, or along the entire winding.

[0027] The cross section of each measuring conductor path can be circumferential, for example circular, polygonal and for example rectangular. Preferably, the cross-sectional shape of the measuring conductor path is constant along its extension. The measuring conductor path can be straight and / or curved and / or arc-shaped in the section along its extension. For example, the measuring conductor path can be a polygonal line or can include straight sections, which are respectively connected to each other by arc-shaped or circular arc-shaped sections.

[0028] In an embodiment, the measuring conductor path may have a meandering and / or zigzag extension at the measuring position. In this way, there is the possibility of making the measuring conductor path longer in the direction of current flow while requiring less surface space. In particular, the length of the measuring conductor path in the direction of current flow at the measuring position may be longer than the outer circumferential line defining and limiting the measuring position. For example, the length of the measuring conductor path at the measuring position may be at least about 3 to 5 times the length of the outer circumferential line defining or limiting the measuring position.

[0029] Any embodiment of the stator arrangement may be manufactured as follows:

[0030] First, a stator core is provided. Subsequently, an electrically insulating coating is applied to the stator core, preferably by an injection molding method. The stator core is, so to speak, partially or completely overmolded and in this way forms a stator body.

[0031] The measuring conductor path can be produced on or in the covering layer during production of the covering layer or subsequently by additional method steps, so that the covering layer serves as a support for at least one measuring conductor path. In particular, the covering layer and the at least one measuring conductor path can form a unit that cannot be separated non-destructively.

[0032] Subsequently, the required electrical connections can be realized. In particular, the at least one measuring conductor path is electrically connected to the evaluation unit of the temperature determination device. Depending on whether the evaluation unit provides an impressed voltage or an impressed current, corresponding other parameters (i.e., current or voltage) can be measured or determined in another way, and the resistance of the at least one measuring conductor path can be determined based on Ohm's law. This resistance characterizes the temperature at the measurement location at which the at least one measuring conductor path is arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Preferred embodiments of the present invention are derived from the dependent claims, the description and the drawings. Preferred embodiments of the present invention are explained in detail below based on the drawings. Among them:

[0034] Figure 1 An embodiment of a stator arrangement is shown in a perspective view,

[0035] Figure 2 A perspective view showing the Figure 1 An embodiment of a stator core of a stator arrangement structure,

[0036] Figures 3 to 5 They are shown respectively Figure 2 Schematic basic illustration of different configurations of the measuring conductor paths on the teeth of the stator body,

[0037] Figure 6 and Figure 7 shows a basic illustration in a cross section through a portion of a stator body, in which a measuring conductor path is arranged in or on a coating on the stator body,

[0038] Figure 8 Shows Figure 1 A circuit diagram of an embodiment of a temperature determination device for a stator arrangement, and

[0039] Fig. 9 and Fig.10 They are shown respectively Figure 8 Basic illustration of different configurations of measuring circuit branches of a temperature determination device. DETAILED DESCRIPTION

[0040] exist Figure 1 An exemplary embodiment of a stator arrangement 20 is shown in a perspective view in FIG. The stator arrangement 20 is provided for use in an electrical machine, such as an electric motor. Figure 1 In the stator arrangement 20 shown in FIG. 1 , the rotor is arranged coaxially outside the stator arrangement (external rotor). Alternatively, the stator arrangement 20 can also be designed for an electric machine with an internal rotor.

[0041] The stator arrangement 20 has a stator core 21, which is Figure 2 The stator core 21 defines a longitudinal axis L, which is the axis of rotation of the associated rotor when used in an electric machine. In the present embodiment, the stator core 21 has an annular part 22 surrounding the longitudinal axis L in the circumferential direction C.

[0042] In the present embodiment, the stator core 21 includes teeth 23 that are evenly distributed and spaced apart from each other in the circumferential direction C, and the teeth extend radially outward. The teeth 23 have the same geometric structure or shape, respectively. They have tooth flanks 24 and tooth tops 25. The tooth flanks 24 connect the tooth tops 25 to the annular component 22. In the present embodiment, the tooth flanks 24 have a smaller size than the tooth tops 25 in the circumferential direction C. The tooth tops 25 protrude away from the tooth flanks 24 on both sides in the circumferential direction C. Therefore, each tooth 23 has a T-shape when viewed in the axial direction A parallel to the longitudinal axis L. Each tooth flank 24 has two tooth flanks 26, which can be configured as flat surfaces. According to the example, the tooth flanks 26 are arranged in a plane defined by the axial direction A and a direction extending orthogonally to the axial direction A.

[0043] The tooth flanks 26 of teeth 23 that are directly adjacent in the circumferential direction C face toward a common winding slot 27 between these two adjacent teeth 23 .

[0044] In the axial direction A, each tooth 23 has two faces 28. In the present embodiment, the faces 28 are each arranged on a plane oriented orthogonally to the longitudinal axis L.

[0045] The stator core 21 may be formed of a plurality of stator sheet components stacked on each other in the axial direction A and having the same outer contour. Therefore, the stator core 21 may also be referred to as a stator pack. The stacked stator sheet components are electrically insulated from each other to reduce the generation of eddy currents.

[0046] Each tooth 23 of the stator core 21 is used to arrange a stator winding 29 ( Figure 1 ). The stator winding 29 is wound around the associated tooth flank 24. Therefore, each stator winding 29 extends in a section in two winding slots 26 that are directly adjacent in the circumferential direction C and protrudes beyond the surface 28 and forms a winding head 30 there. Figure 1 In FIG. 1 , the winding heads 30 of the stator winding 29 are substantially visible.

[0047] The stator windings 29 can be electrically connected in series and / or in parallel, depending on the configuration of the stator arrangement 20, depending on the arrangement and number of the strands of the stator arrangement. For example, four stator windings 29 can each be electrically connected to one strand.

[0048] The stator core 21 is partially or completely covered by the insulating coating layer 31, and together with the coating layer 31 forms a stator body 32 ( Figure 1 The coating 31 can be continuous or can also have a plurality of regions that are spatially separated from one another. The coating 31 can preferably be applied to the stator core 21 by an injection molding method. The coating 31 is particularly designed to electrically insulate the stator core 21 from the stator winding 29 .

[0049] exist Figure 6 and Figure 7 The cladding layer 31 is schematically shown in FIG. Figure 6 and Figure 7 By way of example and in part, a section plane is shown through a tooth 23 , for example a tooth flank 24 , at which an insulating coating 31 is applied on the outer side.

[0050] The stator arrangement 20 has a temperature determination device 35 ( Figure 8 ), which is configured to determine one or more temperature values, wherein each temperature value describes one or more measurement positions M of the stator arrangement 20 ( Figure 2 ) at a temperature T.

[0051] Each measuring position M is arranged at a tooth 23. The measuring position M can be located on a surface in the region of the surface 28 or in a winding slot 27 in the region of the tooth flank 26. The number of measuring positions M is arbitrary. Depending on the configuration of the temperature determination device 35, a separate temperature value for the temperature T can be determined for each measuring position M, or a temperature value can be determined for a plurality of measuring positions M, which temperature value describes a statistical value at the measuring position M, for example an average temperature.

[0052] The temperature determination device 35 has one or more measuring circuit branches 36 ( Figure 8 Each measuring circuit branch 36 comprises at least one measuring conductor path 37. Figure 8 In the embodiment shown in FIG. 1 , each measuring circuit branch 36 has exactly one measuring conductor path 37. Fig. 9 and Fig.10 As shown in FIG. 1 , a plurality of measuring conductor paths 37 can also be provided in each measuring circuit branch 36. The measuring conductor paths 37 can be electrically connected in parallel ( Fig. 9 ) or in series ( Fig.10 ) are connected to each other.

[0053] Each measuring conductor path 37 includes a temperature-dependent resistor RT. To this end, the measuring conductor path 37 may include or may be composed of a suitable material. For example, materials such as platinum, nickel, metal alloys or silicon may be used. The temperature-dependent resistor RT may include a positive temperature coefficient (PTC) or a negative temperature coefficient (NTC), and may therefore be configured as a PTC thermistor or an NTC thermistor. In the present embodiment, all measuring conductor paths 37 have the same properties and may in particular be composed of the same material. Alternatively, a plurality of measuring conductor paths 37 may also be manufactured from different materials and / or a plurality of measuring conductor paths 37 of conductors having different temperature-resistance characteristics may be constructed.

[0054] exist Figure 8In the embodiment of the temperature determination device 35 shown in FIG, three measuring circuit branches 36 are shown by way of example. As a modification to this, the number of measuring circuit branches 36 can be higher or lower. Preferably, exactly one measuring position M on the stator body 32 is associated with each measuring circuit branch 36. Therefore, at least one measuring circuit path 37 of a measuring circuit branch 36 is positioned at the associated measuring position M.

[0055] Individual measuring point M can be, for example, an individual tooth 23 or a section of an individual tooth 23, for example one of the tooth flanks 26 or the face 28 of the tooth 23. Preferably, individual measuring point M is associated with exactly one stator winding 29 arranged on an individual tooth 23 of the stator body 32.

[0056] exist Figure 8 In the embodiment depicted in , the temperature determination device 35 is configured to apply an input voltage UE (applied voltage) to each measuring circuit branch 36. To this end, the measuring circuit branches 36 can be connected in parallel to one another to an input voltage source 38 of an evaluation unit 39.

[0057] A measuring resistor Rk of the evaluation unit 39 can be connected in series to each measuring circuit branch 36, wherein a voltage Uk is applied to each measuring resistor Rk to characterize the current Ik flowing through the corresponding measuring circuit path 36, wherein k=1, 2, 3, etc. is an index corresponding to the number of measuring circuit branches 36 set.

[0058] Therefore, for Figure 8 , the evaluation unit 39 includes a first measuring resistor R1, a second measuring resistor R2 and a third measuring resistor R3, which are respectively connected in series to the corresponding measuring circuit branch 36. The measuring resistors R1, R2, R3 are respectively connected to the input voltage source 38. A first voltage U1 is applied to the first measuring resistor R1 to characterize the first current I1 through the first measuring resistor R1. Similarly, a second voltage U2 is applied to the second measuring resistor R2 to characterize the second current I2 through the second measuring resistor R2. Similarly, a third voltage U3 is applied to the third measuring resistor R3 to characterize the third current I3 through the third measuring resistor R3.

[0059] The input voltage UE is known. By determining the currents I1, I2, I3 or the voltages U1, U2, U3 characterizing the currents, a temperature value WT can be determined in the evaluation unit 39 of the temperature determination device 35, wherein the temperature value WT is characteristic for the temperature T of the stator arrangement 20 at the corresponding measuring circuit branch 36. For this purpose, based on Ohm's law, the value of the temperature-dependent resistance RT can be determined in the evaluation unit 39, and then (from the known correlation between the temperature and the temperature-dependent resistance RT of the measuring conductor path 37) the temperature T associated with the temperature-dependent resistance RT value can be determined. For this purpose, the evaluation unit 39 can generate a temperature signal ST characterizing the temperature T. The temperature signal ST can be further processed, or can be transmitted to a user interface (e.g. a display) and can be indicated to an operator, or can be further used and / or processed in another way. For example, the temperature of the stator arrangement 20 can be monitored and a warning can be generated if a temperature limit value is exceeded. In addition, measures for reducing the temperature can be initiated.

[0060] In order to determine the temperature T and / or generate the temperature signal ST, the evaluation unit 39 may include a module 40 configured to determine the temperature T based on a known correlation between the input voltage UE and a parameter characterizing the current Ik, such as the voltage Uk. To this end, the module 40 may include a function, a lookup table, a characteristic line, a characteristic diagram, etc. The module may in particular include a computing device, such as a microprocessor, and optionally a data memory.

[0061] exist Figures 3 to 5 The arrangement of the measuring conductor paths 37 at the measuring positions M is schematically shown in FIG. Figure 3 In the exemplary embodiment shown, the measuring conductor path 37 is arranged at a measuring position M in the region of the surface 28 of the tooth 23 . Figure 4 An exemplary embodiment of a measuring conductor path 37 is shown, which is arranged in the region of a tooth flank 26 of a tooth 23 . Figure 5 It can be said that it depicts the Figure 3 and Figure 4 A combination of embodiments of the present invention, wherein the measuring conductor path 37 has a conductor path section in the region of the surface 28 and a conductor path section in the region of the tooth flank 26 of the tooth 23. Figures 3 to 5 In all the embodiments shown in , each measuring conductor path 37 has two electrical connections 42 which are arranged in the region of the surface 28 of the tooth 23 . This allows a simple electrical connection of the respective measuring conductor path 37 in the temperature determination device 35 .

[0062] exist Figures 3 to 5In the embodiment shown in , each measuring conductor path 37 has a plurality of straight sections or bridges adjacent to each other. In the connection area between two directly connected bridges or sections, the measuring conductor path 37 forms a bend. In the embodiment shown, the bend has an absolute value of 90° in any case. In addition or alternatively to the embodiment shown, each measuring conductor path 37 can also be arc-shaped or curved in sections. For example, the bend can also be replaced by an arc, in particular a circular arc, which connects two straight extended sections to each other. In general, the geometric structure or extension of each measuring conductor path 37 between the connecting parts 42 can be selected arbitrarily.

[0063] exist Figure 4 1 shows a very simple example of a measuring conductor path 37. Here, the measuring conductor path 37 has two sections or bridges extending parallel to each other, which are connected on one side to the associated electrical connection 42 and on the other side to another section or bridge. The measuring conductor path 37 is, so to speak, U-shaped.

[0064] In order to achieve a sufficient conductor length in the direction of the current flow between the two connections 42, the measuring conductor path 37 can include a meandering conductor path section 43, depending on the available area of ​​the individual measuring positions M, such as in Figure 3 and Figure 5 Here, the meandering conductor path section 43 is arranged in the region of the surface 28 of the tooth 23. Additionally or alternatively, the meandering conductor path section 43 can also be arranged on the tooth side 26. The length of the meandering conductor path section 43 in the current flow direction is significantly longer than the length of the outer contour of the measuring position M extending around the meandering conductor path section 43. In this way, even if the length and width of the measuring position M (outer contour) are small, the effective conductor length of the measuring conductor path 37 at the measuring position M can also be very long. This allows for greater flexibility in the dimensioning of the temperature-dependent resistor RT and / or the material selection of the measuring conductor path 37.

[0065] Each measuring conductor path 37 is arranged in the coating 31 ( Figure 7 ) or in the coating layer 31 ( Figure 6), at least one measuring conductor path 37 is a component of the covering 31 and cannot be separated from the covering 31 in a non-destructive manner. The at least one measuring conductor path 37 is connected to the covering 31 in a materially bonded manner during its production or during the production of the covering 31. Preferably, an MID production method is used for the production of the covering 31 together with the at least one measuring conductor path 37. The abbreviation "MID" thus stands for the English expression "Molded Interconnected Devices". Therefore, for example, a two-component injection molding method, a laser MID method or other known MID methods can be used.

[0066] In the embodiment shown here, the covering 31 is manufactured by an injection molding method and thus forms an injection molded layer. The covering 31 provides an injection molded support for at least one measuring conductor path 37. In addition or as an alternative, other components of the temperature determination device 35 can also be integrated in the covering 31 similarly to the at least one measuring conductor path 37.

[0067] Depending on the selected MID technology, at least one measuring conductor path 37 can be produced after injection molding of the covering layer 31, for example, by means of laser exposure and subsequent metallization on the surface of the covering layer 31 ( Figure 7 Alternatively, at least one measuring conductor path 37 can also be produced during the production of the covering 31, for example by a two-component or multi-component injection molding method ( Figure 6 ).

[0068] In all embodiments, it can be said that the at least one temperature-sensitive measuring conductor path 37 forming the temperature sensor is not a separate independent component, but is realized in a space-saving integrated manner with the covering 31. As a result, the at least one measuring conductor path 37 has a high positioning accuracy. Misalignment is avoided or at least reduced. In particular, the at least one measuring conductor path 37 can be arranged directly adjacent to the surrounding stator winding 29 in or on the covering 31, so that the temperature of the surrounding stator winding 29 can be detected very accurately.

[0069] The invention relates to a stator arrangement 20 and a method for producing the same. The stator arrangement 20 has a stator body 32, which has a stator core 21, which is completely or partially covered by an electrically insulating coating 31. A temperature-sensitive measuring conductor path 37 is arranged in or on the coating and is realized integrally with the coating 31. For this purpose, for example, an MID production method can be used. At least one temperature-sensitive measuring conductor path 37 has a temperature-dependent resistance RT. It is preferably arranged at a measuring position M between a tooth 23 of the stator body 32 and a stator winding 29 wound on the tooth 23. Reference numerals list 20 Stator layout 21 stator core 22 Ring parts 23 teeth 24 tooth flank 25 Tooth top 26 Tooth side 27 winding slots 28 faces 29 Stator winding 30 Winding head 31 Coating 32 stator body 35. Temperature determination device 36 Measurement circuit branch 37 Measuring conductor path 38 Input voltage source 39 evaluation units 40 modules 42 Electrical connection interface 43 Meandering conductor path section A Axial direction C Circumferential direction I1 First current I2 Second current I3 Third current L Longitudinal axis M Measurement position R1 First measurement resistor R2 Second measurement resistor R3 Third measuring resistor RT Temperature-dependent resistance ST temperature signal T Temperature UE Input Voltage U1 First Voltage U2 Second voltage U3 Third voltage

Claims

1. A stator arrangement (20) for an electric machine, comprising: a stator body (32) having a stator core (21), wherein the stator body (32) is configured for attaching at least one stator winding (29), - an electrically insulating coating (31) which partially or completely covers the stator core (21) of the stator body (32), A temperature determination device (35) comprising at least one measuring conductor path (37) having a temperature-dependent resistance (RT), wherein the at least one measuring conductor path (37) is arranged on or in the coating (31).

2. The stator arrangement according to claim 1, wherein: The at least one measuring conductor path (37) and the covering (31) are an integral unit.

3. The stator arrangement according to claim 1 or 2, wherein: The at least one measuring conductor path (37) is non-releasably connected to the covering (31).

4. The stator arrangement according to any one of the preceding claims, wherein: A mechanical connection between the coating (31) and the at least one measuring conductor path (37) is produced by manufacturing the coating (31) and / or the at least one measuring conductor path (37).

5. The stator arrangement according to claim 4, wherein: The coating layer (31) is an injection molded layer.

6. The stator arrangement according to any one of the preceding claims, wherein: The temperature determination device (35) comprises a plurality of measuring conductor paths (37) which are arranged spatially spaced apart from one another at different measuring positions (M) on the stator body (32).

7. The stator arrangement according to any one of the preceding claims, wherein: The temperature determination device (35) comprises at least one measuring circuit branch (36), the measuring circuit branch comprising one measuring conductor path (37) or a plurality of measuring conductor paths (37), and wherein the temperature determination device (35) is configured to provide, for each measuring circuit branch (36), a measurement parameter describing the temperature (T) of the measuring circuit branch (36).

8. The stator arrangement according to claims 6 and 7, wherein: A measuring circuit branch (36) is arranged at each of at least two different measuring positions (M).

9. The stator arrangement according to claim 6 and 7 or according to claim 8, wherein: The measuring circuit branch (36) or one of the provided measuring circuit branches (36) comprises a plurality of measuring conductor paths (37) arranged at different measuring positions (M).

10. The stator arrangement according to any one of claims 6 to 9, wherein: Each measuring circuit branch (36) comprises two electrical connections (42), wherein at least one of the connections (42) is arranged on a face of the stator body (32).

11. The stator arrangement according to any one of the preceding claims, wherein: The temperature determination device (35) comprises a plurality of measuring conductor paths (37) which are arranged electrically in parallel and / or in series.

12. The stator arrangement according to any one of the preceding claims, wherein: The at least one measuring conductor path (37) is arranged on a face of the stator body (32) and / or in a winding slot (27) of the stator body (32).

13. The stator arrangement according to any one of the preceding claims, wherein: The at least one measuring conductor path (37) comprises a meandering conductor path section (43).

14. A method for producing a stator arrangement (20) for an electric machine, comprising: - a stator core (21) providing a stator body (32), wherein the stator body (32) is configured for attaching at least one stator winding (29), - producing an electrically insulating coating (31) which partially or completely surrounds the stator core (21) of said stator body (32), and - producing at least one measuring conductor path (37) having a temperature-dependent resistance (RT) of a temperature determination device (35), wherein the at least one measuring conductor path (37) is arranged on or in the coating (31).

15. The method according to claim 14, wherein: The covering (31) and the at least one measuring conductor path (37) are produced by the MID method.

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