Measuring device for measuring the temperature of a stator winding

Abstract

The invention relates to a device for measuring the temperature of an elongated measuring piece (13) which is associated with the stator winding of a stator (11) of an electric motor, in particular a measuring piece which protrudes from the stator (11) in an angular manner, preferably substantially perpendicularly thereto, in particular a hairpin of the stator winding, said device having a first housing part (19) comprising a receiving area (21) for the elongated measuring piece (13), which can be arranged in the receiving area in order to carry out the temperature measurement; a sensor mounting (23) which is arranged in the first housing part and has a sensor (18) for measuring the temperature of the elongated measuring piece (13); and a spring element which is supported against the first housing part (19) and by means of which the sensor mounting (23) is pressed or can be pressed against the elongated measuring piece (13).

Description

[0001] Measuring device for measuring the temperature of a stator winding

[0002] The present invention relates to a measuring device for measuring the temperature of the stator winding of an elongated measuring piece, in particular a hairpin of the stator winding, associated with the stator of an electric motor and protruding at an angle from the stator. The invention further relates to an electric motor with such a measuring device.

[0003] It is known to monitor the heat development of stator windings of electric motors using temperature sensors. In this context, for stators with hairpin windings, it is known, among other things, to leave a stator or hairpin protruding from the winding and 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.

[0004] Depending on the installation situation, it can be challenging to securely and reliably position a temperature sensor probe, even despite the positioning tolerances of the stator pin. In this case, it is generally necessary to ensure that supply lines to the sensor can be routed out of the electric motor housing without allowing media, such as oil mist, to escape from the motor housing or allowing media to flow into the motor housing from the outside. It is also advisable to ensure that the temperature sensor is as free from contamination as possible.

[0005] Based on this, it is the object of the present invention to further develop the measuring device and the electric motor mentioned above.

[0006] This object is achieved by a measuring device having the features of claim 1 and an electric motor having the features of claim 25.

[0007] The measuring device according to the invention 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 the measurement of its temperature.

[0008] Furthermore, a measuring sensor (particularly 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 measuring sensor can be, for example, a resistance temperature sensor (NTC).

[0009] Finally, according to the invention, a spring element is provided which is preferably supported 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 measuring sensor and the elongated measuring piece in the receiving space to be reduced or prevented.

[0010] By providing such a first housing part according to the invention, the elongated measuring piece can be protected and placed inside the first housing part. The spring element can ensure the most secure positioning of the measuring sensor, which is ideally 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, as far as possible, does not change during operation of the electric motor.

[0011] The first housing part can further comprise an immersion opening, particularly located in the region of an outer side thereof, through which the elongated measuring piece can be moved into the receiving space of the first housing part and into a measuring position therein when the measuring device is attached to the elongated measuring piece. This can, in particular, be an immersion opening adjoined by an immersion region tapering inward in a funnel shape.

[0012] According to a particularly preferred embodiment of the invention, the first housing part can have a sensor holder, preferably separate and in particular removable from the first housing part, on or in which the sensor is arranged. In other words, the sensor can preferably be detachably arranged and / or fastened in or on the sensor holder, for example, in an interior space of the sensor holder.

[0013] 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.

[0014] The spring force of the spring element allows the probe holder, together with the probe mounted on or in it, to be pressed against the elongated measuring piece. The spring force of the spring element can thus ensure that the probe holder—together with the probe—is held against the elongated measuring piece.

[0015] Particularly, but not only, when a probe holder is omitted, the spring force of the spring element can also be used to press or push the elongated measuring piece directly against the probe. For this purpose, the spring element can, for example, be placed directly against one side of the elongated measuring piece and then press it against the probe with its spring force.

[0016] The sensor holder and / or the sensor can be clamped or clamped together with the elongated measuring piece between two housing walls of the first housing part which are spaced apart from one another.

[0017] Furthermore, as regards the sensor holder, this, in particular one side thereof, can 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 elongate measuring piece, against one side of the elongate measuring piece, preferably against a longitudinal side, and specifically while contacting this side.

[0018] As for the receiving space of the first housing part, it can have a first receiving space section with a first, larger transverse dimension (transverse to its longitudinal axis). This can serve, for example, to accommodate a first section of the elongated measuring piece if this section has a first, larger transverse dimension (transverse to its longitudinal extent) 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, in particular a spherical or mushroom-shaped section.

[0019] Furthermore, the receiving space can also have a second receiving space section with a second, smaller transverse dimension than the first receiving space section. This can then serve to accommodate a section of the elongated measuring piece, or the section preferably adjoining the first section, which then has the second, smaller transverse dimension. This can, for example, be a rod-shaped section of the same.

[0020] The aforementioned second receiving space section can also be delimited on one side by the contact section of the sensor holder. On an opposite side and / or on one or more additional sides, the second receiving space section can also be delimited, for example, by a (possibly different) wall of the first housing part.

[0021] As far as the first receiving space section is concerned, this can be limited on one side by a section of the sensor holder which is set back transversely axially relative to the contact section of the sensor holder, in particular in order to create the larger transverse dimension compared to the second receiving space section.

[0022] The measuring sensor holder can further be designed and arranged, and interact with the spring element, in such a way that it has an initial position which it assumes when the elongated measuring piece is not arranged in the receiving space, wherein it can be moved from this initial position against the spring force of the spring element into a second position in which the transverse dimension of the first and second receiving space sections is increased compared to the initial position. This is achieved in particular by a counterforce which is exerted on the measuring sensor holder by the elongated measuring piece during 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 insertion opening of the first housing part into its measuring position within the receiving space.

[0023] The aforementioned second position of the sensor holder can be a permanent position or a final position in which the elongated measuring piece is already in its measuring position and in which the aforementioned transverse dimensions of the receiving space sections are larger than in the starting position. However, it is also conceivable, among other things, that the second position is an intermediate position that is only assumed during assembly. For example, it is conceivable that a front end section of the elongated measuring piece has a larger transverse dimension than the remaining section of the same and then, upon immersion, the sensor holder is initially moved upwards or to the side against the spring force, with the sensor holder then later being returned to the starting position or a third position, in particular the end position. Various variants are conceivable here.

[0024] In a particularly preferred embodiment of the invention, the first housing part can be movably mounted on a further component of the measuring device, which is in particular stationary. This is in particular such that relative movements between the first housing part and the further component are possible at an angle to the longitudinal extent of the elongate measuring piece and / or at an angle to the longitudinal axis of the first housing part. This is preferably to compensate for position tolerances of the elongate measuring piece in relation to a desired measuring position thereof. If, for example, the elongate measuring piece does not protrude exactly perpendicularly from the stator or from the stator main plane - as is often the case - and the first housing part may also move accordingly.after assembly on the elongated measuring piece does not extend exactly perpendicular to the stator, the measuring device can compensate for such deviations if necessary by using such an additional component on which the first housing part is mounted in a correspondingly movable manner.

[0025] The further component can, for example, be designed as a second housing part, for example made of plastic, possibly injection-molded.

[0026] The further component can alternatively also be a (particularly solid) sealing body, preferably made of a preferably elastic sealing material, in particular a plastic sealing material.

[0027] In this context, the first housing part can also be detachably and / or positively and / or frictionally connected to the further component. 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 a plurality of locking means, and then the respective other component, i.e., the further component or the first housing part, can have a counterpart for each locking means, with which the respective locking means is locked and / or connected in a positive and / or frictionally engaged manner.

[0028] The locking means can be resilient tabs, or each locking means can have a resilient tab. For example, the first housing part could preferably have resilient tabs connected to it in one piece. The further component can then have, as a counterpart, a contact surface that runs, in particular, obliquely to the axial direction of the first housing part. For example, a contact surface arranged, in particular, on the outside of the further component, against which an end section of the respective resilient tab rests and relative to which the respective end section is movable to compensate for positional tolerances of the elongated measuring piece with respect to a desired measuring position.

[0029] The movable bearing can also be implemented by means of an articulated connection, in particular by means of a swivel joint.

[0030] The first housing part and the further component, embodied, for example, as a sealing body, can also be connected to one another via an elongated connecting piece, preferably formed integrally with the first housing part. In particular, a connecting piece having a ball head at the front end, which is arranged in the sealing body for rotational movement or rotation.

[0031] Furthermore, at least one electrical power or control line ending at the measuring sensor can be led from the first housing part to the further housing part.

[0032] This can be guided by a shrink tube extending in particular between the first housing part and the further component outside the first housing part and the further component.

[0033] If the further component is designed as a sealing body, the shrink tube can extend in the interior of the sealing body with the sealing body material in sealing contact with the peripheral surface of the shrink tube, in particular in a channel in the sealing body which preferably extends axially or parallel to the longitudinal axis of the sealing body.

[0034] In a particularly preferred embodiment of the invention, the electric motor can be provided with a housing in which, among other things, the stator and the elongated measuring piece are arranged. In order to be able to easily measure the temperature of the elongated measuring piece with the measuring device, the first housing part can then be placed in the housing.

[0035] Furthermore, it may be provided to provide a suitable access or passage opening for the measuring device in a housing wall of the housing.

[0036] The additional component, or at least a portion thereof, can then be arranged in this through-opening. Any gap between the through-opening or the surrounding, in particular peripheral, housing wall surface on the one hand and the additional component or the outer side of the additional component facing the housing wall surface should then preferably be suitably sealed to prevent the transfer of harmful media from the inside to the outside or vice versa.

[0037] For this purpose, the further component can have a radial seal, preferably arranged circumferentially on an outer side thereof, for sealing a circumferential sealing gap or, see above, can be a sealing body or the above-mentioned sealing body, which then has radial sealing means for sealing the sealing gap. In particular, a circumferential sealing gap between the further component and a housing wall surface of the corresponding housing wall of the electric motor, which delimits such a preferably round through-opening.

[0038] The further component may furthermore have an interior space in which one or more electrical contacts are arranged, in particular at least one electrical contact to which the power or control line ending at the sensor holder is connected.

[0039] This interior space of the second component can be filled with a (preferably electrically insulating) potting compound to protect it from media harmful to the electrical contact(s), so that the electrical contact(s) is / are completely surrounded by the potting compound. Furthermore, one, the or each interior space of the second component through which harmful, in particular gaseous or liquid, media could penetrate through the second component 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) can be completely or partially filled with a potting compound that prevents this (sealing).

[0040] Further features of the present invention emerge from the appended patent claims, the following description of preferred embodiments and the appended drawings.

[0041] It shows:

[0042] Fig. 1 is a schematic oblique view, partially in section, 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,

[0043] Fig. 2 shows the illustration from Fig. 1, but with a first embodiment of a measuring device according to the invention, also shown in an oblique view,

[0044] Fig. 3 shows a cross section through the electric motor and the measuring device of the embodiment according to Fig. 2,

[0045] Fig. 4. a cross section through a second embodiment of a measuring device according to the invention.

[0046] The two measuring devices 10 and 10' according to the invention in Figs. 2-3 and 4, respectively, serve to measure the temperature of a stator 11 or the corresponding stator winding of an electric motor 12. Most of the components, etc., 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 or the stator winding extends is identified by a partial surface 11a.

[0047] An elongated measuring piece 13 protrudes from the stator 11, in the present case perpendicular to the main plane of the stator 11 or the plane in which the winding(s) is / are located.

[0048] 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 known hairpin winding. However, it is understood that other winding types are also within the scope of the invention.

[0049] In the present case, the elongated measuring piece 13 is located within the housing 14 or in the interior 15 thereof.

[0050] In order to be able to place a measuring 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 14a, the longitudinal center axis of which is aligned with the longitudinal center axis of the elongated measuring piece 13 or lies parallel to it and which connects the outer space 17 arranged outside the housing 14 with the inner space 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', wherein a section of the same sits directly in the through-opening 16.

[0051] First, the measuring device 10 shown in Figs. 2 and 3 will be described in more detail.

[0052] In the present case, it comprises a first housing part 19, which has an internal receiving space 21, in which the elongated measuring piece 13 is seated in the assembled state of the measuring device 10 shown, and adjacent to this, a sensor holder 23 with an interior space 22, in which the sensor 18 is seated 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 on a wall of the first housing part 19, so that it rests securely there.As a result, the sensor holder 23 (with the sensor 18) together with the elongated measuring piece 13 is clamped by means of the spring force of the spring element 34 in the position shown between opposite walls of the first housing part 19 (cross-axially), so that axial relative movements between the sensor 18 and the elongated measuring piece 13 in the receiving space 21 are reduced or prevented.

[0053] Furthermore, the measuring device 10 comprises a further component, in the present case a second housing part 20, the longitudinal axis of which in the present case is substantially aligned with the longitudinal axis of the first housing part 19.

[0054] 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 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. For this purpose, the first housing part 19 has a plurality of locking means 27, namely, in this case, resilient tabs, each of which interacts with a counterpart 28 of the second housing part 20.

[0055] Specifically, the respective counterpart 28 comprises a contact surface 28a, which runs particularly obliquely to the longitudinal axis of the first housing part 19. An end section 30 of the respective locking means 27 rests against this surface. The respective counterpart 28 further comprises a transversely axially extending contact surface 28b. The respective locking means 27 is locked to the two aforementioned contact surfaces 28a and 28b and is connected to them in a form-fitting and / or frictional manner.

[0056] This movable mounting allows for easy compensation of positional tolerances of the elongated measuring piece 13. For example, unlike shown in Fig. 2, the elongated measuring piece 13 may not be aligned with the longitudinal center axis of the through-opening 16 or extend parallel to it, but may extend at a slight angle to it.

[0057] In this case, the movable bearing can compensate for such positioning tolerances, since the movable bearing allows the longitudinal axes of the two housing parts 19, 20 to be slightly angled to each other, so that they are not exactly aligned. Within the scope of this compensating movement, the end portion 30 of at least one locking means 27 can or would move slidingly relative to the contact surface 28a or along it.

[0058] As can be clearly seen in particular in Fig. 3, power lines or power cables 24 terminate at the measuring sensor 18 arranged in the first housing part 19, which power lines or power cables 24 are led to the second housing part 20 and there are led to contacts 26 arranged in an interior space 25 and are electrically connected to these or, if applicable, end at these.

[0059] Through a connection channel 26 of the second housing part 20 with a connection opening accessible from the outside, power lines can then be led to the contacts 26 from the outside.

[0060] The aforementioned interior space 25 of the second housing part 20 is preferably filled with an electrically insulating potting compound to protect against media harmful to the electrical contact(s) 26, 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 generally speaking 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.

[0061] For a very similar reason or in particular to prevent such a 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 14a, which delimits the through opening 16, and the opposite outer side of the second housing part 20.

[0062] Furthermore, as can be seen in Fig. 3, the first housing part 19 has a lateral insertion opening 35 in the area of ​​an outer side facing the stator 11, through which the elongated measuring piece 13 can be inserted into the receiving space 21 during assembly and then moved into a (final) measuring position. Further relationships are described in more detail below.

[0063] For centering purposes and / or to simplify this immersion process, the immersion opening 35 is adjoined in this case by an immersion area 36 which narrows inwards in a funnel shape.

[0064] As can also be seen, the sensor holder 23 has a contact section

[0065] 23 a, which is pressed by the spring force of the spring element 34 against the longitudinal side 13 a of the elongated measuring piece 13 while bearing against it. As for the receiving space 21, it comprises a first receiving space section 21 a with a first, larger transverse dimension and a second receiving space section 21 b with a second, smaller transverse dimension (transverse dimension in each case from bottom to top in Fig. 3).

[0066] The second receiving space section 21 b is delimited on one (upper) side by the contact section 23 a of the sensor holder 23 and the first receiving space section 21 a is delimited by a section 23 b of the sensor holder 23 which is set back transversely axially with respect to the contact section 23.

[0067] As can be further seen in Fig. 3, the first (larger) receiving space section 21 a serves to receive a spherical head-shaped, 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 adjoining the spherical head-shaped end section 13 b of the elongated measuring piece 13, the transverse dimension of which is smaller than the transverse dimension of the spherical head-shaped end section 13 b.

[0068] As far as the sensor holder 23 is concerned, it is shown in Fig. 3 in a final position after assembly has been completed, in which it rests with its contact section 23 a directly on the rod-shaped section 13 c of the elongated measuring piece 13 or the long side 13 a.

[0069] Before assembly, ie before the elongated measuring piece 13 is moved into the receiving space 21 via the immersion opening 35, the measuring sensor holder 23 is in a possibly, but not necessarily, different starting position (in particular arranged somewhat further down in Fig. 3).

[0070] In this initial position, the transverse dimension of the second receiving space section 21 b is smaller than the (maximum) transverse dimension of the spherical head-shaped end section 13 b, so that during assembly the latter could not actually be moved (in Fig. 3 from right to left) through the second receiving space section 21 b into its final position in the first receiving space section 21 b.

[0071] However, during assembly, a counterforce is exerted on the sensor holder 23, which counteracts the spring force of the spring element 34, in Fig. 3 directed upwards, which moves the latter into a second position, namely upwards, enlarging the second and in this case also the first receiving space section 21 a or 21 b.

[0072] This counterforce is exerted during assembly by the elongated measuring piece 23, in particular its spherical head-shaped end section 13b, on the measuring sensor holder 23 when the latter is moved by a user through the lateral insertion opening 35 (from right to left in Fig. 3) into its final measuring position in the receiving space 21. Unlike in the initial position, in which the transverse dimension of the end section 13b is larger than the transverse dimension of the second receiving space section 21b, due to the temporary enlargement of the transverse dimension of the second receiving space section 21b in the second position of the measuring sensor holder 23, it is correspondingly possible for the spherical head-shaped end section 13b to be moved through the second receiving space section 21b into its final position in the first receiving space section 21a.

[0073] After the spherical head-shaped end section 13 b has then been moved through the second receiving space section 21 b, the sensor holder 23 is moved in the present case by the spring force of the spring element 34 in the context of a return movement in the opposite direction (downward) into the end position shown in Fig. 3, in which the sensor holder 23 comes to rest on the long side 13 a.

[0074] Fig. 4 shows the second embodiment of a measuring device according to the invention, namely the measuring device 10'. Compared to the measuring device 10 of Figs. 2-3, similar components are provided with the same reference numerals as in Figs. 2-3. The following primarily focuses on the differences between the measuring device 10' and the measuring device 10.

[0075] 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 absolutely necessary, since the elongated measuring piece 13 of the measuring device 10' does not have a spherical head-shaped end section with a larger transverse dimension, which would require the provision of a receiving space section adapted to it.

[0076] In the receiving space 21 of the measuring device 10', the elongated measuring piece 13, which is moved during assembly via the lateral insertion opening 35 into the shown end position in the receiving space 21, is pressed directly, i.e. without a measuring sensor holder 23, against the measuring sensor 18, which is protected in this case by a shrink tube 37, by the spring force of the spring element 34, which is supported on a lower housing wall of the first housing part 19, which in turn is supported - together with the shrink tube 37 - on 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 measuring sensor holder 23 - reduces or prevents axial relative movements between the measuring sensor 18 and the elongated measuring piece 13 in the receiving space 21.

[0077] Another significant difference is that the additional component, which sits in the through-opening 16 of the housing wall 14a and on which the first housing part 19 is movably mounted, is not a housing part made of (rigid) plastic, but rather an elastic sealing body 38 made of a suitable plastic sealing material, which seals the through-opening 16 and has radial sealing lips 39 forming the radial seal 33 for sealing the sealing gap 32.

[0078] The movable mounting of the first housing part 19 on the further component or the sealing body 38 is also designed differently in the measuring device 10' than in the measuring device 10. The first housing part 19 and the sealing body 38 are connected to one another via an elongated connecting piece 40 which is formed / connected in one piece with the first housing part 19. The connecting piece 40 has a spherical head 41 at its front or free end, which is arranged in a rotationally movable or rotatable manner in a corresponding bearing part of the sealing body 38, for example designed as a spherical recess in the sealing body 38, to form the movable mounting.

[0079] As far as the power line 24 is concerned, 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, specifically within the shrink tube 37.

[0080] The shrink tube 37, together with the power line 24, extends further inside the sealing body 38, with the sealing body material sealingly abutting the peripheral surface of the shrink tube 37, specifically in a channel extending preferably axially or parallel to the longitudinal axis of the sealing body 38 and located within the sealing body material. List of reference symbols

[0081] 10 measuring devices 24 power lines

[0082] 10' measuring device 25 contacts

[0083] 11 Stator 26 Connection channel

[0084] 11 a Partial surface of stator 27 Locking means

[0085] 12 Electric motor 28 Counterpart

[0086] 13 elongated measuring piece 28 a contact surface counterpart

[0087] 13 a Long side 28 b Contact surface counterpart

[0088] 13 b spherical head-shaped end section 30 end section

[0089] 13 c rod-shaped section 31 housing wall surface

[0090] 14 Housing 32 Sealing gap

[0091] 14 a Housing wall electric motor 33 Radial seal

[0092] 15 Interior housing electric motor 34 Spring element

[0093] 16 Through hole 35 Immersion hole

[0094] 17 Outdoor area 36 Immersion area

[0095] 18 Sensor 37 Shrink tubing

[0096] 19 first housing part 38 sealing body

[0097] 20 second housing part 39 sealing lips

[0098] 21 Receiving space 40 Connecting piece

[0099] 21 a first receiving space section 41 ball head with larger transverse dimension

[0100] 21 b second receiving space section with smaller transverse dimension

[0101] 22 Interior sensor holder

[0102] 23 probe holder

[0103] 23 a Annex Section

[0104] 23 b recessed section

Claims

Patent claims 1. A measuring device for measuring the temperature of the stator winding of a stator (11) of an electric motor, an elongated measuring piece (13) projecting in particular at an angle, preferably substantially perpendicular to the stator (11), in particular a hairpin of the stator winding, the measuring device comprising 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, a measuring sensor (18) arranged in the first housing part for measuring the temperature of the elongated measuring piece (13), and a spring element (34) preferably supported on the first housing part (19), the spring force of which, 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 measuring sensor (18) and the elongated measuring piece (13) in the receiving space (21) to be reduced or prevented.

2. Measuring device according to claim 1, characterized in that the first housing part (19) has an immersion opening (35) arranged in particular in the region of an outer side thereof, via which the elongate measuring piece (13) can be moved into the receiving space (21) into a measuring position, in particular an immersion opening (35) which is followed by an immersion region narrowing in the shape of a funnel towards the inside.

3. Measuring device according to claim 1 or 2, characterized in 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 in that by the spring force of the spring element (34) the measuring sensor holder (23) together with the measuring sensor (18) arranged on or in it can be pressed or is pressed against the elongated measuring piece (13) and / or that by the spring force of the spring element (34) the elongated measuring piece (13) is pressed against the measuring piece, which is protected in particular by a shrink tube (37). sensor (18) can be pressed or is pressed.

5. Measuring device according to claim 3 or 4, characterized in that the measuring sensor holder (23) has a contact section (23a) which can be pressed or is pressed by the spring force of the spring element (34), in particular in a or the measuring position of the elongate measuring piece (13) within the receiving space (21), while bearing against this against one side of the elongate measuring piece (13), in particular against a longitudinal side.

6. Measuring device according to one or more of the preceding claims, characterized in that the measuring sensor holder (23) and / or the measuring sensor (18) together with the elongated measuring piece (13) can be clamped or is clamped between two spaced-apart housing walls of the first housing part (19).

7. Measuring device according to one or more of the preceding claims, characterized in 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 elongate measuring piece (13) with a first, larger transverse dimension, preferably a free end section thereof, in particular one which is spherical or mushroom-shaped, and a second receiving space section with a second, smaller transverse dimension, in particular for receiving a section of the elongate measuring piece (13), preferably adjoining the first section, with a second, smaller transverse dimension, preferably a rod-shaped section thereof.

8. Measuring device according to claim 7, characterized in that the second receiving space section is limited on one side by the contact section (23a) of the sensor holder (23).

9. Measuring device according to claim 7 or 8, characterized in that the first receiving space section is delimited on one side by a section (23b) of the sensor holder (23) which is set back transversely axially with respect to the contact section (23a).

10. Measuring device according to one or more of the preceding claims, at least according to claim 7, characterized in that the measuring sensor holder (23) has an initial position which it assumes when the elongate measuring piece (13) is not arranged in the receiving space (21), and in that the measuring sensor holder (23) can be moved from this initial position into a second position by a counterforce directed against the spring force of the spring element (34), in particular by a counterforce which is exerted on the measuring sensor holder (23) by the elongate 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 the second receiving space section.

11. Measuring device according to one or more of the preceding claims, characterized in that the first housing part (19) is movably mounted on a further, in particular stationary, component (20) of the measuring device, preferably designed as a second housing part (20) or as a sealing body, in particular from preferably elastic sealing body material, in particular in such a way that relative movements between the first housing part (19) and the further component (20) at an angle to the longitudinal extent of the elongate measuring piece (13) and / or at an angle to the longitudinal axis of the first housing part (19) are possible, preferably to compensate for positional tolerances of the elongate measuring piece (13).

12. Measuring device according to claim 11, characterized in that the first housing part (19) is positively and / or frictionally connected to the further component (20), preferably detachably.

13. Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized in 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 a plurality of 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 in that the locking means (27) are resilient tabs, in particular resilient tabs preferably connected in one piece to the first housing part (19) or the further component (20), and in that the respective counterpart comprises a contact surface which runs 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 against which an end section of the respective resilient tab rests and relative to which the respective end section is movable in order to compensate for positional tolerances of the elongated measuring piece (13) in relation to a desired measuring position.

15. Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized in 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 (14a) of the electric motor, which delimits 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, at least according to claim 11, characterized in that at least one electrical power or control line ending at the measuring sensor (18) is led from the first housing part (19) to the further component.

17. Measuring device according to one or more of the preceding claims, characterized in that the further component (20) has an interior in which one or more electrical contacts (25) are arranged, in particular at least one electrical contact to which the power or control line ending at the sensor holder (23) is connected.

18. Measuring device according to claim 17, characterized in that the interior the further component (20) is coated with a particularly electrically insulating casting compound to protect it from a medium harmful to the electrical contact(s) (25), so that the electrical contact(s) (25) is / are completely surrounded by the casting compound.

19. Measuring device according to one or more of the preceding claims, characterized in that one, the or each interior space of the further component (20), through which medium could penetrate through the further component (20) from the side of the further component (20) facing the first housing part (19) to the opposite other side of the further component (20) - in particular when the further component (20) is arranged in a preferably round through-opening (16) in a housing wall (14a) of the electric motor, into the housing (14) of the electric motor or conversely out of the housing (14) of the electric motor - is completely or partially filled with a casting compound which prevents this.

20. Measuring device according to one or more of the preceding claims, characterized in that the measuring sensor (18) is arranged in an interior space of the measuring sensor holder (23).

21. Measuring device according to one or more of the preceding claims, at least according to claim 11, characterized in that the first housing part (19) is mounted on the further component (20) by means of an articulated connection, in particular by means of a rotary joint.

22. Measuring device according to claim 21, characterized in that the first housing part (19) and the further component (20), which is designed in particular as a sealing body, are connected to one another via an elongated connecting piece, which is preferably designed in one piece with the first housing part (19), in particular a connecting piece which has a spherical head (41) at the front end, which is rotatably arranged in the sealing body.

23. Measuring device according to one or more of the preceding claims, characterized in that the power and / or control line is guided through a 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).

24. Measuring device according to claim 23, characterized in that the shrink tube, if the further component (20) is designed as a sealing body, extends with the sealing body material sealingly against the peripheral surface of the shrink tube (37) in the interior of the sealing body, in particular in a channel in the sealing body extending preferably axially or parallel to the longitudinal axis of the sealing body.

25. An electric motor comprising a stator (11), a stator winding, and an elongated measuring piece (13) which is thermally conductively connected to the stator winding, in particular designed as a hairpin, preferably protruding at an angle, particularly preferably substantially perpendicularly from the stator (11), the temperature of which allows conclusions to be drawn about the temperature of the stator winding from the temperature of the elongated measuring piece (13), characterized in that the electric motor comprises a measuring device for measuring the temperature of the stator winding, in particular according to one or more of the preceding claims, which comprises a first housing part (19) with a receiving space (21) for the elongated measuring piece (13), in which the latter sits in a measuring position for temperature measurement, with a measuring 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) which is preferably supported on the first housing part (19),whose spring force, in particular directed at an angle, preferably transversely to the longitudinal axis of the first housing part (19), causes or can cause axial relative movements between the measuring sensor (18) and the elongated measuring piece (13) in the receiving space (21) to be reduced or prevented.

26. Electric motor according to claim 25, characterized in that the first housing part (19) is movably mounted on a further component (20) of the measuring device, in particular in such a way that relative movements between the first housing part (19) and the further Component (20) at an angle to the longitudinal extent of the elongate measuring piece (13) and / or at an angle to the longitudinal axis of the first housing part (19) are possible, preferably to compensate for position tolerances of the elongate measuring piece (13) in relation to a desired measuring position thereof.

27. Electric motor according to claim 25, characterized in 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) seated 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 a section.

28. Electric motor according to claim 27, characterized in that a radial seal (33) sealing the sealing gap (32) is arranged in a sealing gap (32) between the further component (20) and a housing wall surface (31) of the housing wall (14 a) which delimits the through opening (16).

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