Measuring device for measuring the temperature of a stator winding

Abstract

Measuring device for measuring the temperature of the stator winding of a stator (11) of an electric motor, comprising an elongated, in particular angular, preferably substantially perpendicular measuring element (13), in particular a hairpin of the stator winding, projecting from the stator (11), wherein the measuring device has a first housing part (19) with a receiving space (21) for the elongated measuring element (13), in which the latter can be arranged for temperature measurement, with a sensor (18) arranged in the first housing part for measuring the temperature of the elongated measuring element (13), and with a spring element (34) preferably supported on the first housing part (19), the spring force of which is directed in particular angularly, preferably transversely to the longitudinal axis of the first housing part (19), causes or can cause axial relative movements between the sensor (18) and the elongated measuring element (13) in the receiving space (21) to be reduced or prevented.wherein the first housing part (19) is movably mounted on a further component (20) of the measuring device, wherein at least one electrical current or control line terminating at the sensor (18) is led from the first housing part (19) to the further component (20).

Description

[0001] The present invention relates to a measuring device for measuring the temperature of the stator winding of an electric motor, specifically an elongated measuring element, in particular a hairpin of the stator winding, projecting at an angle from the stator. The invention further relates to an electric motor with such a measuring device.

[0002] It is known to monitor the heat development of stator windings in electric motors using temperature sensors. In this context, it is known, among other things, for stators with hairpin windings, to have a stator pin or hairpin protrude from the winding and to measure its temperature in order to draw conclusions about the stator winding temperature. In the simplest case, the stator winding temperature corresponds to the temperature of the protruding stator pin.

[0003] Depending on the installation situation, it can be challenging to securely and reliably position a temperature sensor probe, even considering stator pin positional tolerances. It is also generally necessary to ensure that the probe leads can be routed out of the electric motor housing without allowing any media, such as oil mist, to escape from the housing or for any external media to enter the housing. Furthermore, it is advisable to protect the temperature sensor from contamination.

[0004] DE 10 2020 215 884 A1 discloses a sensor arrangement for an electric motor for generating indicative signals regarding the thermal state of a conductor of the electric motor, comprising a holding element that can be fixed to a section of the electric motor and a measuring element that is received in the holding element.

[0005] WO 2024 / 054 525 A1 discloses a temperature sensor for determining the temperature of a stator of an electric motor comprising a thermal sensor arranged in a piston and a housing.

[0006] DE 10 2019 202 912 A1 discloses a wiring arrangement for a stator of an electric machine comprising a busbar forming a segment of a switching ring with an external terminal and a winding terminal, and a receiving element that is at least thermally coupled to the busbar. Furthermore, a temperature sensor device for mounting on the receiving element of the wiring arrangement and a system for detecting a temperature on a stator are disclosed.

[0007] DE 10 2019 121 190 A1 discloses an electrical machine comprising a stator with a winding, and a temperature sensor arrangement comprising a temperature sensor for detecting the temperature in the area of ​​the winding, wherein the ends of at least part of the conductors protrude beyond the winding, wherein part of these ends is connected to a connecting ring placed axially or radially on the winding, wherein the temperature sensor arrangement is arranged on or in the connecting ring and the temperature sensor is thermally coupled to at least one conductor there.

[0008] Based on this, the object of the present invention is to further develop the aforementioned measuring device and the aforementioned electric motor.

[0009] This problem is solved by a measuring device having the features of claim 1 and an electric motor having the features of claim 24.

[0010] The measuring device or the electric motor according to the invention with such a measuring device accordingly has a first housing part, preferably designed as an injection-molded plastic component, which has a receiving space for the elongated measuring piece, designed in particular as a hairpin, wherein the measuring piece can be arranged in this receiving space for measuring its temperature.

[0011] Furthermore, a sensor (in particular a separate one, preferably removable from the first housing part during disassembly) is arranged in the first housing part, with which the temperature of the elongated measuring piece can be measured. The sensor can, for example, be a resistance temperature sensor (NTC).

[0012] Finally, according to the invention, a spring element is provided which preferably supports itself on the first housing part of the measuring device, for example on a wall thereof, and whose spring force, which is directed in particular at an angle, preferably transversely to the longitudinal axis of the first housing part, causes or can cause unwanted axial relative movements between the sensor and the elongated measuring piece in the receiving space to be reduced or prevented.

[0013] By providing such a first housing part according to the invention, the elongated measuring piece can be placed protected inside the first housing part. The spring element can ensure the most secure possible positioning of the measuring sensor, which is advantageously arranged as close as possible to the elongated measuring piece, and in particular, a precise positioning of the measuring sensor relative to the elongated measuring piece that does not change as much as possible during operation of the electric motor.

[0014] The first housing part can further have an immersion opening, particularly located on its outer surface, through which the elongated measuring piece can be moved into the receiving space of the first housing part and into a measuring position when the measuring device is attached to the elongated measuring piece. This can, in particular, be an immersion opening followed by an inwardly constricting immersion area.

[0015] According to a particularly preferred embodiment of the invention, the first housing part can have a preferably separate and, in particular, removable sensor holder on or in which the sensor is arranged.

[0016] In other words, the sensor can preferably be detachably arranged and / or attached in or to the sensor holder, for example in an interior of the sensor holder.

[0017] The sensor holder can, for example, be made of a preferably highly thermally conductive plastic in order to achieve the best possible heat transfer from the elongated measuring piece to the sensor.

[0018] The spring force of the spring element allows the sensor holder, together with the sensor attached to or within it, to be pressed against the elongated measuring piece. In this way, the spring force of the spring element ensures that the sensor holder – together with the sensor – is held against the elongated measuring piece.

[0019] Particularly, but not exclusively, when a probe holder is omitted, the spring force of the spring element can allow the elongated measuring piece to be pressed directly against the probe, or to be pressed against it. For this purpose, the spring element can, for example, rest directly against one side of the elongated measuring piece and then press it against the probe with its spring force.

[0020] Furthermore, the sensor holder and / or the sensor can be clamped together with the elongated measuring piece between two opposing housing walls of the first housing part.

[0021] As regards the sensor holder, it may, in particular one side thereof, have a contact section which can be pressed or is pressed by the spring force of the spring element, in particular in one or the measuring position of the elongated measuring piece, against a side of the elongated measuring piece, preferably against a longitudinal side, in contact with this side.

[0022] As regards the receiving space of the first housing part, it can have a first receiving space section with a first, larger transverse dimension (perpendicular to its longitudinal axis). This can, for example, serve to receive a first section of the elongated measuring piece if this section (perpendicular to its longitudinal extent) has a first, larger transverse dimension than a second section of the elongated measuring piece. This first section of the elongated measuring piece can, for example, be a free end section of the same, particularly one that is spherical or mushroom-shaped.

[0023] Furthermore, the recording space can also have a second recording space section with a second, smaller transverse dimension than the first recording space section. This can then serve to hold a section of the elongated measuring piece that preferably adjoins the first section and has the second, smaller transverse dimension. This could, for example, be a rod-shaped section of the same.

[0024] The aforementioned second recording space section can, moreover, be bounded on one side by the mounting section of the sensor holder. On the opposite side and / or on one or more further sides, the second recording space section can also be bounded, for example, by a (possibly different) wall of the first housing part.

[0025] As regards the first recording space section, this can be limited on one side by a section of the sensor holder that is set back transversely axially relative to the mounting section of the sensor holder, particularly in order to create the larger transverse dimension compared to the second recording space section.

[0026] The sensor holder can further be designed and arranged, and interact with the spring element, in such a way that it has a starting position which it assumes when the elongated measuring piece is not located in the receiving space. From this starting position, it can be moved against the spring force of the spring element into a second position in which the transverse dimension of the first and second sections of the receiving space is increased compared to the starting position. This is achieved in particular by a counterforce exerted on the sensor holder by the elongated measuring piece during the assembly or fastening of the measuring device or the first housing part to the elongated measuring piece, while the elongated measuring piece is moved by a user through the immersion opening of the first housing part into its measuring position within the receiving space.

[0027] The aforementioned second position of the probe holder can be a permanent or final position, in which the elongated measuring piece is already in its measuring position and in which the transverse dimensions of the receiving chamber sections are larger than in the initial position. However, it is also conceivable that the second position is an intermediate position, assumed only during assembly. For example, it is conceivable that a front end section of the elongated measuring piece has a larger transverse dimension than the rest of the same section, and then, upon immersion, the probe holder is initially moved upwards or to the side against the spring force, followed by a subsequent return of the probe holder to the initial position or a third position, particularly the final position. Various variations are conceivable here.

[0028] According to the invention, the first housing part is movably mounted on a further component of the measuring device, which is preferably stationary. This is done in such a way that relative movements between the first housing part and the further component are possible at angles to the longitudinal extent of the elongated measuring piece and / or at angles to the longitudinal axis of the first housing part. This is preferably used to compensate for positional tolerances of the elongated measuring piece with respect to a target measuring position. Thus, if, for example, the elongated measuring piece does not protrude exactly perpendicularly from the stator or the main plane of the stator – as is often the case – and if, accordingly, the first housing part does not extend exactly perpendicularly to the stator after being mounted on the elongated measuring piece, the measuring device can compensate for such deviations as needed by using such a further component on which the first housing part is movably mounted.

[0029] The additional component can, for example, be designed as a second housing part, for example made of plastic, possibly injection molded.

[0030] The other component can alternatively also be a (particularly solid) sealing body, preferably made of a preferably elastic sealing material, in particular a plastic sealing material.

[0031] In this context, the first housing part can also be detachably and / or positively and / or frictionally connected to the further component.

[0032] For the aforementioned movable mounting of the first housing part on the further component, either the first housing part or the further component can, for example, comprise several locking means and then, accordingly, the other component, i.e., the further component or the first housing part, can each have a counterpart for each locking means with which the respective locking means is locked and / or positively and / or frictionally connected.

[0033] The locking devices can be spring tabs, or each locking device can be a single spring tab. For example, the first housing part could preferably have spring tabs integrally connected to it. The subsequent component can then have a corresponding contact surface, particularly one inclined to the axial plane of the first housing part. This contact surface, for example, is located on the outside of the subsequent component, and each end section of the respective spring tab rests against it. The end section of each spring tab is movable relative to this contact surface to compensate for positional tolerances of the elongated measuring piece in relation to a nominal measuring position.

[0034] The movable bearing can also be implemented by means of a joint connection, in particular by means of a swivel joint.

[0035] The first housing part and the further component, designed, for example, as a sealing body, can also be connected to each other via an elongated connecting piece, preferably formed integrally with the first housing part. In particular, a connecting piece that has a ball head at its front end, which is rotatably arranged within the sealing body.

[0036] Furthermore, at least one electrical current or control line, ending at the sensor, runs from the first housing part to the next housing part.

[0037] This can be guided by a heat shrink tube extending, in particular, between the first housing part and the further component, outside of the first housing part and the further component.

[0038] If the other component is designed as a sealing body, the shrink tubing can extend inside the sealing body with the sealing body material in a sealing contact with the circumferential surface of the shrink tubing, in particular in a channel in the sealing body which preferably extends axially or parallel to the longitudinal axis of the sealing body.

[0039] In a particularly preferred embodiment of the invention, the electric motor may have a housing in which, among other things, the stator and the elongated measuring piece are arranged. In order to easily measure the temperature of the elongated measuring piece with the measuring device in this case, the first housing part may be placed inside the housing.

[0040] Furthermore, it may be possible to provide a suitable access or through-opening for the measuring device in a housing wall of the housing.

[0041] The additional component, or at least a section thereof, can then be positioned within this through-opening. Any gap between the through-opening, or the surrounding housing wall surface, and the additional component, or the outer surface of the additional component facing the housing wall surface, should preferably be appropriately sealed to prevent the transfer of harmful media from the inside to the outside or vice versa.

[0042] For this purpose, the additional component can have a radial seal, preferably arranged circumferentially on one of its outer sides, for sealing a circumferential sealing gap, or, as described above, it can be the aforementioned sealing body, which then has radial sealing means for sealing the sealing gap. In particular, a circumferential sealing gap between the additional component and a housing wall surface of the corresponding housing wall of the electric motor, which defines such a, preferably round, through-opening.

[0043] Furthermore, the additional component may have an interior space in which one or more electrical contacts are arranged, in particular at least one electrical contact to which the current or control line terminating at the sensor holder is connected.

[0044] This interior space of the second component can be filled with a (preferably electrically insulating) potting compound to protect it from medium harmful to the electrical contact(s), so that the electrical contact(s) is / are completely surrounded by the potting compound.

[0045] Furthermore, any interior space of the second component, through which harmful, in particular gaseous or liquid, medium could penetrate from the side of the second housing part facing the first housing part to the opposite side of the second housing part (or vice versa), may be wholly or partially filled with a sealing compound to prevent this.

[0046] Further features of the present invention will become apparent from the attached patent claims, the following description of preferred embodiments and the attached drawings.

[0047] It shows: Fig. 1 A schematic oblique view, partially cut away, of a housing wall of a housing of an electric motor according to the invention, which has a stator with an elongated measuring piece designed as a hairpin, the temperature of which is to be measured, Fig. 2 the representation from Fig. 1, however, with a first embodiment of a measuring device according to the invention, also shown in oblique view, Fig. 3 a cross-section through the electric motor and the measuring device of the embodiment according to Fig. 2, Fig. 4. a cross-section through a second embodiment of a measuring device according to the invention.

[0048] The two measuring devices 10 and 10' according to the invention Fig. Figures 2-3 and 4 are used to measure the temperature of a stator 11 and the corresponding stator winding of an electric motor 12, respectively. Most components of both the electric motor 12 and its stator 11 are not shown. Among other things, a section of a housing wall 14a of the housing 14 of the electric motor 12 is shown as an example. Furthermore, the stator 11, or the main plane in which the stator 11 and the stator winding extend, is represented by a partial surface 11a.

[0049] An elongated measuring piece 13 extends from the stator 11, in this case perpendicular to the main plane of the stator 11 or the plane in which the winding or windings are located.

[0050] The elongated measuring piece 13 is a so-called stator pin, which is thermally connected to the rest of the stator winding, so that its temperature provides information about the temperature of the entire stator winding. In the present case, the elongated measuring piece 13 is designed as a hairpin, since the stator winding is also a hairpin winding known per se. However, it is understood that other winding types are also covered by the scope of protection of the invention.

[0051] In the present case, the elongated measuring piece 13 is located inside the housing 14 or in the interior 15 thereof.

[0052] In order to be able to place a sensor 18 of the measuring device 10 or 10' for measuring the temperature of the elongated measuring piece 13 on or adjacent to the elongated measuring piece 13, even from outside the housing 14 of the electric motor 12, a through-opening 16 is provided in the housing wall 14 a, the longitudinal central axis of which is aligned with or parallel to the longitudinal central axis of the elongated measuring piece 13 and which connects the outer space 17 arranged outside the housing 14 with the interior 15 of the housing 14 and which, in the installed state of the measuring device 10 or 10', is penetrated by the measuring device 10 or 10', with a section of it sitting directly in the through-opening 16.

[0053] First, the in the Fig. 2 and Fig. 3 The measuring device shown is described in more detail in section 10.

[0054] In the present case, it comprises a first housing part 19, which has an internal receiving chamber 21 in which, in the assembled state of the measuring device 10 shown, the elongated measuring piece 13 is located, and adjacent to this is a sensor holder 23 with an interior space 22 in which the sensor 18 is located and can measure the temperature of the adjacent elongated measuring piece 13. The sensor holder 23 is pressed against a longitudinal side 13a of the elongated measuring piece 13 by the spring force of a spring element 34, which is supported against a wall of the first housing part 19, so that it rests securely against it.As a result, the sensor holder 23 (with the sensor 18) together with the elongated measuring piece 13 is clamped in the position shown between opposing walls of the first housing part 19 (transversely axially) by means of the spring force of the spring element 34, so that axial relative movements between the sensor 18 and the elongated measuring piece 13 in the receiving space 21 are reduced or prevented.

[0055] Furthermore, the measuring device 10 comprises another component, in the present case a second housing part 20, the longitudinal axis of which in the present case is essentially aligned with the longitudinal axis of the first housing part 19.

[0056] The second housing part 20 is movably mounted on the first housing part 19 such that relative movements between the two housing parts 19, 20 are possible at angles to the longitudinal extent of the elongated measuring piece 13 and / or at angles to the longitudinal axis of the first housing part 19. For this purpose, the first housing part 19 has several locking elements 27, namely spring-loaded tabs, each of which interacts with a counterpart 28 of the second housing part 20.

[0057] Specifically, each counterpart 28 comprises a contact surface 28a extending obliquely to the longitudinal axis of the first housing part 19. An end section 30 of the respective locking element 27 rests against this contact surface. Each counterpart 28 also comprises a transversely axially extending contact surface 28b. The respective locking element 27 is locked to these two contact surfaces 28a and 28b, and is connected to them by a positive and / or frictional locking mechanism.

[0058] This movable bearing allows positional tolerances of the elongated measuring piece 13 to be easily compensated for. For example, the elongated measuring piece 13 might, unlike in Fig. 2 shown, does not align with or extend parallel to the longitudinal center axis of the passage opening 16, but runs at a slight angle to it.

[0059] In this case, the movable bearing can compensate for such positional tolerances, since the movable bearing allows the longitudinal axes of the two housing parts 19, 20 to be slightly perpendicular to each other, so that they are not perfectly aligned. During this compensatory movement, the end section 30 of at least one locking element 27 can or would move slidingly relative to or along the contact surface 28a.

[0060] As particularly in Fig. As can be clearly seen, power lines or cables 24 end at the measuring sensor 18 arranged in the first housing part 19, which are led to the second housing part 20 and are led there to contacts 26 arranged in an interior 25 and are electrically connected to them or possibly end at them.

[0061] Through a connection channel 26 of the second housing part 20 with an externally accessible connection opening, power lines can then be led from the outside to the contacts 26.

[0062] The aforementioned interior space 25 of the second housing part 20 is preferably filled with an electrically insulating potting compound to protect the electrical contacts 26 from a medium harmful to them, for example, oil mist, which could penetrate (possibly via the first housing part 19) from the interior space 15 of the housing 14 of the electric motor 12 into the second housing part 20 and / or, more generally, to protect against harmful medium transfer between the outer space 17 and the interior space 15 of the housing 14, so that the contacts 25 are completely surrounded by the potting compound.

[0063] For a very similar reason, or in particular to prevent such harmful medium transfer, a radial seal 33 sealing the sealing gap 31 is further arranged in a sealing gap 32, which is formed between the circumferential housing wall surface 31 of the housing 14 or the housing wall 14 a, which limits the passage opening 16, and the opposite outer side of the second housing part 20.

[0064] As regards the first housing part 19, it shows, as in Fig. As can be seen in Figure 3, a lateral immersion opening 35 is located on the outer side facing the stator 11, through which the elongated measuring piece 13 can be immersed into the receiving chamber 21 during assembly and then moved into a (final) measuring position. Further details are described below.

[0065] For centering purposes and / or to simplify this immersion process, an immersion area 36, ​​which narrows inwards in a funnel shape, is connected to the immersion opening 35.

[0066] As can also be seen, the sensor holder 23 has a contact section 23 a which is pressed against the longitudinal side 13 a of the elongated measuring piece 13 by the spring force of the spring element 34.

[0067] Regarding recording room 21, it comprises a first recording room section 21a with a first, larger transverse dimension and a second recording room section 21b with a second, smaller transverse dimension (transverse dimension in each case in Fig. 3 from bottom to top).

[0068] The second recording space section 21 b is limited on one (upper) side by the system section 23 a of the sensor holder 23 and the first recording space section 21 a by a section 23 b of the sensor holder 23 that is set back transversely axially relative to the system section 23.

[0069] As in the Fig. As can be further seen in Figure 3, the first (larger) receiving space section 21 a serves to receive a spherical, free end section 13 b of the elongated measuring piece 13 and the second (smaller) receiving space section 21 b serves to receive a preferably rod-shaped section 13 c of the same adjoining the spherical end section 13 b of the elongated measuring piece 13, the transverse dimension of which is smaller than the transverse dimension of the spherical end section 13 b.

[0070] As for the sensor holder 23, it is the Fig. 3 shown in a final position after completed assembly, in which its attachment section 23 a lies directly against the rod-shaped section 13 c of the elongated measuring piece 13 or the longitudinal side 13 a.

[0071] Before assembly, i.e., before the elongated measuring piece 13 is moved through the immersion opening 35 into the receiving chamber 21, the sensor holder 23 is located in a position that may, but is not necessarily, differ from the standard position (particularly in the Fig. 3 starting positions arranged slightly further down.

[0072] In this initial position, the transverse dimension of the second receiving space section 21b is smaller than the (maximum) transverse dimension of the spherical end section 13b, so that it should not actually be (in) the assembly. Fig. 3 from right to left) through the second recording room section 21 b into its final position in the first recording room section 21 b.

[0073] However, during assembly on the sensor holder 23, a force is exerted against the spring force of the spring element 34, in Fig. 3 upwardly directed counterforce is exerted, which moves it into a second position, namely upwards, by enlarging the second and in this case also the first recording space section 21a or 21b.

[0074] This counterforce is exerted during assembly by the elongated measuring piece 23, in particular its ball-shaped end section 13 b, on the sensor holder 23 when it is inserted by a user through the lateral immersion opening 35 (in Fig. 3 from right to left) is moved into its final measuring position in the recording space 21. Unlike in the initial position, in which the transverse dimension of the end section 13 b is larger than the transverse dimension of the second recording space section 21 b, it is possible, due to the temporary increase in the transverse dimension of the second recording space section 21 b in the second position of the sensor holder 23, for the spherical end section 13 b to be moved through the second recording space section 21 b into its final position in the first recording space section 21 a.

[0075] After the spherical end section 13b has been moved through the second receiving chamber section 21b, the sensor holder 23 is, in this case, returned in the opposite direction (downwards) by the spring force of the spring element 34 during a return movement. Fig. 3 shown end position moved, in which the sensor holder 23 comes into contact with the longitudinal side 13 a.

[0076] In the Fig. Figure 4 shows the second embodiment of a measuring device according to the invention, namely the measuring device 10'. In comparison to the measuring device 10 of the Fig. 2-3 identical components are provided with the same reference numbers as in the Fig. 2-3. The following discussion focuses primarily on the differences between measuring device 10' and measuring device 10.

[0077] A first significant difference is that the first housing part 19 of the measuring device 10' does not have a sensor holder 23. This is not strictly necessary, since the elongated measuring piece 13 of the measuring device 10' does not have a spherical end section with a larger transverse dimension that would require a specially adapted receiving space section.

[0078] In the receiving chamber 21 of the measuring device 10', the elongated measuring piece 13, which during assembly is moved via the lateral immersion opening 35 into the shown end position in the receiving chamber 21, is pressed directly, i.e. without a sensor holder 23, against the sensor 18, which is protected here by a shrink sleeve 37, by the spring force of the spring element 34, which is supported against a lower housing wall of the first housing part 19, which in turn - together with the shrink sleeve 37 - is supported against an upper housing wall of the first housing part 19, so that a clamping occurs which - similar to the measuring device 10, but without a sensor holder 23 - reduces or prevents axial relative movements between the sensor 18 and the elongated measuring piece 13 in the receiving chamber 21.

[0079] Another significant difference is that the additional component, which sits in the through-opening 16 of the housing wall 14 a and on which the first housing part 19 is movably mounted, is not a housing part made of (rigid) plastic, but an elastic sealing body 38 made of a suitable plastic sealing material, sealing the through-opening 16, with radial sealing lips 39 forming the radial seal 33 for sealing the sealing gap 32.

[0080] The movable mounting of the first housing part 19 on the further component or the sealing body 38 is also designed differently in measuring device 10' than in measuring device 10. The first housing part 19 and the sealing body 38 are connected to each other via an elongated connecting piece 40, which is integrally formed / connected to the first housing part 19. The connecting piece 40 has a ball head 41 at its front or free end, which is arranged to form the movable mounting in a corresponding bearing part of the sealing body 38, for example, a spherical recess in the sealing body 38.

[0081] As regards the power line 24, it is routed between the first housing part 19 and the sealing body 38 outside the first housing part 19 and outside the sealing body 38, inside the shrink tubing 37.

[0082] The shrink tube 37 together with the electrical conductor 24 extends further inside the sealing body 38, with the sealing body material of the same sealing body in a sealing contact with the circumferential surface of the shrink tube 37, in this case in a channel which preferably extends axially or parallel to the longitudinal axis of the sealing body 38 and which is located inside the sealing body material. Reference symbol list 10 Measuring device 10' Measuring device 11 Stator 11a Stator sub-area 12 Electric motor 13 elongated measuring piece 13 a Long side 13 b spherical end section 13 c rod-shaped section 14 cases 14 a Housing wall electric motor 15 Interior housing electric motor 16 Passage opening 17 Outdoor area 18 sensors 19 first housing part 20 second housing part 21 Recording Room 21 a first recording room section with larger transverse dimensions 21 b second recording room section with smaller transverse dimensions 22 Interior sensor holder 23 sensor holders 23 a Plant section 23 b reset section 24 power lines 25 contacts 26 connection channel 27 Resting agents 28 counterpart 28 a Installation area counterpart 28 b Mounting surface counterpart 30 Final section 31 Housing wall area 32 Sealing gap 33 Radial seal 34 Spring element 35 Immersion opening 36 Immersion area 37 Heat shrink tubing 38 sealing bodies 39 sealing lips 40 connector 41 Ball head

Claims

[1] Measuring device for measuring the temperature of the stator winding of a stator (11) of an electric motor, comprising an elongated, in particular angular, preferably substantially perpendicular measuring piece (13), in particular a hairpin of the stator winding, projecting from the stator (11), wherein the measuring device has a first housing part (19) with a receiving space (21) for the elongated measuring piece (13), in which the latter can be arranged for temperature measurement, with a sensor (18) arranged in the first housing part for measuring the temperature of the elongated measuring piece (13), and with a spring element (34) preferably supported on the first housing part (19), the spring force of which is directed in particular angularly, preferably transversely to the longitudinal axis of the first housing part (19), causes or can cause axial relative movements between the sensor (18) and the elongated measuring piece (13) in the receiving space (21) to be reduced or prevented.wherein the first housing part (19) is movably mounted on a further component (20) of the measuring device, wherein at least one electrical current or control line terminating at the sensor (18) is led from the first housing part (19) to the further component (20). [2] Measuring device according to claim 1, characterized by , that the first housing part (19) has an immersion opening (35) arranged in particular in the area of ​​an outer side thereof, through which the elongated measuring piece (13) can be moved into the receiving space (21) into a measuring position, in particular an immersion opening (35) to which an inwardly constricting immersion area is connected. [3] Measuring device according to claim 1 or 2, characterized by , that the first housing part (19) has a sensor holder (23) on or in which the sensor (18) is arranged. [4] Measuring device according to claim 1, 2 or 3, characterized by, that the spring force of the spring element (34) makes the sensor holder (23) together with the sensor (18) arranged on or in it pressable against the elongated measuring piece (13) and / or that the spring force of the spring element (34) makes the elongated measuring piece (13) pressable against the sensor (18) which is protected in particular by a shrink tube (37). [5] Measuring device according to claim 3 or 4, characterized by , that the sensor holder (23) has a contact section (23a) which can be pressed or is pressed against a side of the elongated measuring piece (13), in particular against a longitudinal side, by the spring force of the spring element (34), in particular in one or the measuring position of the elongated measuring piece (13) within the receiving space (21). [6] Measuring device according to one or more of the preceding claims, characterized by, that the sensor holder (23) and / or the sensor (18) together with the elongated measuring piece (13) can be clamped or is clamped between two housing walls of the first housing part (19) that are spaced apart from each other. [7] Measuring device according to one or more of the preceding claims, characterized by , that the receiving space (21) has a first receiving space section with a first, larger transverse dimension, in particular for receiving a first section of the elongated measuring piece (13) with a first, larger transverse dimension, preferably a free end section of the same, and a second receiving space section with a second, smaller transverse dimension, in particular for receiving a section of the elongated measuring piece (13) preferably adjoining the first section with a second, smaller transverse dimension, preferably a rod-shaped section of the same. [8] Measuring device according to claim 7, characterized by , that the second recording space section is limited on one side by the system section (23a) of the sensor holder (23). [9] Measuring device according to claim 7 or 8, characterized by , that the first recording space section is limited on one side by a section (23b) of the sensor holder (23) which is set back transversely axially from the system section (23a). [10] Measuring device according to one or more of the preceding claims, at least according to claim 7, characterized by, that the sensor holder (23) has a starting position which it assumes when the elongated measuring piece (13) is not arranged in the receiving space (21), and that the sensor holder (23) can be moved from this starting position to a second position by means of a counterforce directed against the spring force of the spring element (34), in particular by means of a counterforce exerted on the sensor holder (23) by the elongated measuring piece (13) during a movement through the immersion opening (35) into its measuring position, with a temporary or permanent increase in the transverse dimension of the first and second receiving space sections. [11] Measuring device according to one or more of the preceding claims, characterized by, that the first housing part (19) is movably mounted on the further, stationary component (20) of the measuring device, which is designed as a second housing part (20) or as a sealing body, preferably made of elastic sealing body material, such that relative movements between the first housing part (19) and the further component (20) are possible at an angle to the longitudinal extent of the elongated measuring piece (13) and / or at an angle to the longitudinal axis of the first housing part (19), preferably to compensate for positional tolerances of the elongated measuring piece (13). [12] Measuring device according to claim 11, characterized by , that the first housing part (19) is connected to the further component (20) by a form-fit and / or friction-fit connection, preferably detachably. [13] Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized by, that for the movable mounting of the first housing part (19) on the further component (20) either the first housing part (19) or the further component (20) comprises several locking means (27) and the further component (20) or the first housing part (19) each has a counterpart for each locking means (27) with which the respective locking means (27) is locked and / or positively and / or frictionally connected. [14] Measuring device according to claim 13, characterized by, that the locking means (27) are spring tabs, in particular spring tabs preferably integrally connected with the first housing part (19) or the further component (20), and that the respective counterpart comprises a contact surface extending in particular obliquely to the longitudinal axis of the first housing part (19), in particular a contact surface of the further component (20), particularly preferably a contact surface on which an end section of the respective spring tab rests and relative to which the respective end section is movable to compensate for positional tolerances of the elongated measuring piece (13) in relation to a target measuring position. [15] Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized by, that the further component (20) has a radial seal (33) preferably arranged circumferentially on an outer side thereof for sealing a circumferential sealing gap (32) or that the further component (20) is the sealing body with radial sealing means for sealing a circumferential sealing gap (32), in particular a circumferential sealing gap (32) between the further component and a housing wall surface (31) of a housing wall (14 a) of the electric motor, which defines a preferably round through-opening (16) in which the further component (20) can be arranged. [16] Measuring device according to one or more of the preceding claims, characterized by , that the further component (20) has an interior space in which one or more electrical contacts (25) are arranged, in particular at least one electrical contact to which the current or control line terminating at the sensor holder (23) is connected. [17] Measuring device according to claim 16, characterized by , that the interior of the further component (20) is filled with a potting compound, in particular an electrically insulating compound, to protect against medium harmful to the electrical contact(s) (25), so that the electrical contact(s) (25) is / are completely surrounded by the potting compound. [18] Measuring device according to one or more of the preceding claims, characterized by, that any interior space of the further component (20) could be penetrated by the medium through the further component (20) from the side of the further component (20) facing the first housing part (19) to the opposite side of the further component (20) - in particular if the further component (20) is arranged in a preferably round through-opening (16) in a housing wall (14 a) of the electric motor, into the housing (14) of the electric motor or conversely out of the housing (14) of the electric motor - is wholly or partially filled with a potting compound that prevents this. [19] Measuring device according to one or more of the preceding claims, characterized by , that the sensor (18) is arranged in an interior space of the sensor holder (23). [20] Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized by, that the first housing part (19) is mounted on the further component (20) by means of a hinge connection, in particular by means of a swivel joint. [21] Measuring device according to claim 21, characterized by , that the first housing part (19) and the further component (20), which is designed in particular as a sealing body, are connected to each other via an elongated connecting piece, preferably formed integrally with the first housing part (19), in particular a connecting piece which has a ball head (41) at its front end which is rotatably arranged in the sealing body. [22] Measuring device according to one or more of the preceding claims, characterized by , that the power and / or control line is guided through a heat shrink tube (37) extending in particular between the first housing part (19) and the further component (20) outside the first housing part (19) and the further component (20). [23] Measuring device according to claim 22, characterized by , that the shrink tubing, if the further component (20) is designed as a sealing body, extends inside the sealing body with the sealing body material in sealing contact with the circumferential surface of the shrink tubing (37), in particular in a channel in the sealing body which preferably extends axially or parallel to the longitudinal axis of the sealing body. [24] Electric motor with a stator (11), a stator winding and an elongated measuring piece (13) thermally connected to the stator winding, in particular designed as a hairpin, preferably angled, particularly preferably substantially perpendicular to the stator (11), which allows the temperature of the elongated measuring piece (13) to be used to infer the temperature of the stator winding, characterized bythat the electric motor has a measuring device for measuring the temperature of the stator winding, in particular according to one or more of the preceding claims, which has a first housing part (19) with a receiving space (21) for the elongated measuring piece (13) in which the latter is seated in a measuring position for temperature measurement, with a sensor (18) arranged in the first housing part (19) for measuring the temperature of the elongated measuring piece (13), and with a spring element (34) preferably supported on the first housing part (19), the spring force of which is directed in particular at an angle, preferably transversely to the longitudinal axis of the first housing part (19), causes or can cause axial relative movements between the sensor (18) and the elongated measuring piece (13) in the receiving space (21) to be reduced or prevented, wherein the first housing part (19) is movably mounted on a further component (20) of the measuring device,wherein at least one electrical current or control line terminating at the sensor (18) is led from the first housing part (19) to the further component (20). [25] Electric motor according to claim 24, characterized by , that the first housing part (19) is movably mounted on a further component (20) of the measuring device, in particular such that relative movements between the first housing part (19) and the further component (20) are possible at an angle to the longitudinal extension of the elongated measuring piece (13) and / or at an angle to the longitudinal axis of the first housing part (19), preferably to compensate for positional tolerances of the elongated measuring piece (13) in relation to a target measuring position of the same. [26] Electric motor according to claim 24, characterized by, that the electric motor has a housing (14) in which the stator (11) and the first housing part (19) with the elongated measuring piece (13) sitting in its receiving space (21) are arranged, and that a housing wall (14 a) of the housing (14) of the electric motor has a through-opening (16) in which the further component (20) is arranged with at least one section. [27] Electric motor according to claim 26, characterized by , that in a sealing gap (32) between the further component (20) and a housing wall surface (31) of the housing wall (14 a) which limits the through opening (16), a radial seal (33) sealing the sealing gap (32) is arranged.

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