EP3959804A1 - Machine électrique - Google Patents

Machine électrique

Info

Publication number
EP3959804A1
EP3959804A1 EP20718549.7A EP20718549A EP3959804A1 EP 3959804 A1 EP3959804 A1 EP 3959804A1 EP 20718549 A EP20718549 A EP 20718549A EP 3959804 A1 EP3959804 A1 EP 3959804A1
Authority
EP
European Patent Office
Prior art keywords
housing
temperature sensor
winding
conductor
electrical machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20718549.7A
Other languages
German (de)
English (en)
Inventor
Christian Silvery
Mike CZERLEWITZ
Matthias Kästle
Andreas Bexel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP3959804A1 publication Critical patent/EP3959804A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

  • the invention relates to an electrical machine comprising a stator with a winding comprising a plurality of conductors assigned to one or more phases, which are interconnected, and at least one temperature sensor arrangement comprising a temperature sensor section with a temperature sensor for detecting the temperature in the area of the winding.
  • Electrical machines include a rotor and a stator and are used in different areas of application.
  • the use of electrical machines for electric hybrid vehicles and electric vehicles or for hub drives is only mentioned as an example. If such an electrical machine is used as a drive machine, it is mostly designed as an internal rotor, which means that the stator surrounds the internal rotor. A wandering magnetic field is generated via the stator, which causes the rotor to rotate.
  • the stator has a winding consisting of a large number of conductors, the conductors being assigned to one or usually several phases. The winding is guided around the stator teeth in a manner known per se.
  • the number of phases goes into the design of the winding geometry, but also the number of wires per phase as well as the number of wires per slot within the stator toothing and the number of pole pairs.
  • This variety of conductors and winding parameters creates a complex network of conductors that is built up using different winding technologies. Examples include the so-called hairpin or bar wave winding.
  • the conductors are formed by means of rods bent in a U-shape, which are put together to form a winding basket.
  • the conductors are laid on a plurality of radial levels, with the conductors moving from level to level.
  • the temperature of individual components is to be monitored, including appropriate temperature sensors such. B. PTC or NTC sensors can be used.
  • One area in which the temperature is to be detected is that of the winding, since one of the hottest points of the stator of the electrical machine prevails in the area of the winding, where a temperature sensor can be installed.
  • the hottest point of the stator is namely in the hairpin or rod wave winding area, precisely in the axial center of the Blechpa kets.
  • the outer area of the winding is selected.
  • the temperature sensor is installed inside the stator, which means that it usually has to be installed at an early stage in the manufacturing process.
  • the temperature sensor In order to capture the temperature in the winding area as precisely as possible, it is desirable to attach the temperature sensor as close as possible to or on the winding or winding head, since media flows in the interior, such as water, air, oil, etc., can affect the temperature measurement and therefore with The measurement becomes imprecise as the distance between the temperature sensor and the winding or winding head increases.
  • the arrangement of the temperature sensor, in particular on a particularly tightly wound or compactly wound winding, such as a hairpin or a rod-shaped winding, is particularly complicated.
  • the invention is based on the problem of specifying a comparatively improved electrical cal machine.
  • the invention provides that the ends of at least part of the conductors on the inner circumference and / or on the outer circumference of the winding protrude axially or radially over the winding, with a connection ring comprising at least one conductor bridge axially or is placed radially on the winding on which conductor bridge at least part of the conductor is connected, the ends of at least two conductors assigned to a phase protrude radially or axially outward, to which at least one connecting conductor is connected, which is connected to a power connection located radially outside the winding, and where in the temperature sensor section has a sensor housing which is inserted into a housing receptacle provided on the circuit ring in such a way that the temperature sensor is in thermal contact with the connecting conductor or the conductor bridge.
  • connection ring is used for the actual conductor connection of the winding, that is to say a conductor ring that is placed separately on the winding and has one or more conductor bridges.
  • the connection ring placed axially or radially on the winding engages in the area of conductors protruding axially or radially on the inner circumference and / or on the outer circumference of the winding.
  • the head ends are the individual head sections, unless they are on their, z. B. further inner radial planes are connected to each other, assigned assigns.
  • the conductor ends are connected to the interconnection ring, usually welded to it accordingly, so that the corresponding phase-specific conductor structures or conductor connections are generated via the interconnection ring.
  • the interconnection ring has one or more separate conductor bridges to which the ends of the conductors are connected.
  • connection ring is therefore designed as a star distributor, comprising the corresponding conductor bridges and the associated, radially or axially protruding connection sections.
  • the temperature sensor is now integrated on the winding by being positioned on the connection ring in such a way that it is in thermal contact either with the connection conductor via which the conductor ends are in contact with the HV power connector, or with a conductor bridge.
  • the temperature sensor section according to the invention has a sensor housing in or on which the temperature sensor is provided. In the assembly position, this sensor housing is inserted into a housing receptacle provided on the interconnection ring, which is specifically tailored to the geometry of the sensor housing so that it can be fixed sufficiently firmly. The arrangement of the sensor housing is now such that the temperature sensor is in thermal contact with the connecting conductor or the conductor bridge.
  • a defined mounting interface is created on the interconnection ring via the sensor housing and the housing recording, which enables the temperature sensor arrangement to be mounted in a simple manner. This ensures that reproducible assembly and, of course, dismantling in the event of maintenance is possible in a simple manner. In addition to ideal positioning of the temperature sensor, very precise and reliable measurement is also possible, especially since the contact between the temperature sensor and the connecting conductor or the conductor bridge results in a very good heat transfer between the measuring components, so that undesired errors and deviations in measured values are reliably avoided .
  • connection ring also offers protection against external influences such as media flows (water, oil, air, etc.) that cannot reach the temperature sensor.
  • the sensor housing is preferably fixed in the housing receptacle via a latching or clamping connection.
  • a secure, reproducible sensor fixation can be achieved via such a latching or clamping connection, ultimately a form-fitting fastening. It is only necessary in the context of the assembly that the sensor housing is pushed into the housing receptacle and there, for example, to latch or clamp. This then automatically provides correct positioning on the one hand, but also the thermal contact between the temperature sensor and the component to be measured on the other.
  • two spring arms are preferably provided on the sensor housing, which jam in the housing receptacle or snap in with locking elements provided thereon in Rastaufnah provided on the housing receptacle. So it is only necessary to insert into the actual locking position, in which the locking connection is then automatically given.
  • the temperature sensor section itself preferably protrudes from the sensor housing with one end having the temperature sensor. This means that the area that includes the temperature sensor is ultimately exposed, so that it can be brought into direct contact with the connecting conductor or the conductor bridge and a simple thermal coupling can be achieved.
  • a spring element on the sensor housing, via which it is spring-loaded in the direction of the connecting conductor or the conductor bridge.
  • This spring element ensures that the sensor housing and thus also the temperature sensor are always in a defined system or in a defined thermal contact with the connection. tion ladder or the ladder bridge is brought because the spring element urges it against it.
  • a spring element for example, a simple bent leaf spring which protrudes slightly from the sensor housing and which is supported on a corresponding abutment section of the housing receptacle is used.
  • the sensor housing itself preferably consists of a plastic potting compound in which the temperature sensor section and, if provided, also the spring element are embedded.
  • the sensor housing is used to create a defined interface and to enable easy handling, which is why it is preferably made of plastic. It is preferably a potting compound, that is to say that the temperature sensor section and, if provided, also the spring element are injected into this potting compound, and are therefore firmly embedded therein.
  • Corresponding latching or clamping sections which are used to fix the housing in the housing, can also be designed in a simple manner.
  • connection ring itself preferably has a housing on which the housing receptacle is formed, that is to say that the housing receptacle is preferably an integral part of the housing, but can also be attached to it as a separate element.
  • the integral design is preferred, in which case the housing is expediently made of plastic, since in this case such a geometry can easily be formed.
  • the housing preferably consists of a plastic potting compound, the conductor bridge together with the temperature sensor section being embedded in the potting compound.
  • a complete potting is preferably carried out in order to reliably embed and fix the relevant components.
  • the housing receptacle is adjacent to a holder serving to fix at least one connecting conductor, which preferably se is formed integrally on the housing of the interconnection ring, is provided.
  • This holder which is designed radially to the side of the housing, is used to localize one or more connecting conductors, which usually extend between the terminals of the HV power connection and the conductor ends of the winding a little around the circumference of the winding. Excessive swinging is avoided by fixing it in such a holder. After the connecting conductors are consequently already fixed in position in the holder, it makes sense to carry out the housing acquisition adjacent to such a holder. If the Sen care housing is therefore inserted into the holder, it is automatically in thermal contact with the temperature sensor with the connecting conductor recorded in the adjacent holder.
  • the housing receptacle is preferably designed as a circumferential extension of one end of the conductor bridge. This means that the housing receptacle is also designed in a circumferential extension in the star point of the connection ring, which is slightly curved in the circumferential direction of the winding, so that simple integration and thermal coupling is possible in this case as well.
  • Figure 1 shows a schematic diagram of a temperature sensor arrangement
  • Figure 2 is a perspective view of a sensor housing without an integrated temperature sensor arrangement
  • FIG. 3 the sensor housing from FIG. 2 from the other side
  • FIG. 4 the sensor housing with integrated temperature sensor arrangement
  • FIG. 5 is a perspective view of a ladder bridge
  • FIG. 6 shows a perspective view of the connection ring with a conductor bridge integrated in the ring housing
  • FIG. 7 shows a partial view of an electrical machine according to the invention with an arranged interconnection ring with a housing receptacle designed for thermal contact with a connecting conductor and a sensor housing not yet inserted,
  • FIG. 8 shows the arrangement from FIG. 7 with inserted sensor housing
  • FIG. 9 shows a sectional view through the arrangement from FIG. 8,
  • Figure 10 is a partial view of an electrical machine according to the invention with am
  • Connection ring for contacting with a conductor bridge formed housing receptacle with not yet inserted sensor housing
  • FIG. 11 shows a sectional view through the arrangement from FIG. 10 with inserted
  • FIG. 1 shows a basic diagram of a temperature sensor arrangement 1 comprising a temperature sensor section 2 with a temperature sensor 3 which is connected to sensor cables 5 via connecting lines 4.
  • the temperature sensor 3 and the connecting conductors 4 can be arranged in a fixed position on a sensor carrier. They are always covered with a shrink tube 6 for protection.
  • the temperature sensor section 2 has an elongated cylindrical shape, but it can also be rectangular in cross section.
  • FIG. 2 shows a schematic diagram of a sensor housing 7 in which the temperature sensor section 2 is to be accommodated.
  • the sensor housing 7 consists of a plastic potting compound, with either a corresponding elongated receptacle being formed for the temperature sensor section 2 into which it is pushed and therein is fixed, for example, via an adhesive, or the potting compound is injected directly around the sensor section 2.
  • the sensor housing 7 has two lateral guide webs 8 (see also Figure 4), the z. B. the guide in corresponding grooves on a connection ring where the sensor housing 7 is used, which will be discussed below.
  • two spring arms 9 are integrally formed on the plastic sensor housing 7 with locking elements 10 provided thereon, which serve to fix the connection ring in the housing acquisition, which will also be discussed below.
  • a spring element 1 1 is provided, here a leaf spring, which serves to dampen the sensor housing 7 and, with it, the temperature sensor 3 against the element to be measured in terms of its temperature.
  • This spring element 11 preferably a simple, outwardly bent leaf spring, is preferably embedded in the plastic potting compound.
  • Figure 3 shows the rear view of the sensor housing 7, wherein on the Plattenab section 12 a semicircular recess, which here, since the rear is shown, is designed as a semicircular projection 13, wherein the temperature sensor section 2 is partially guided in the recess .
  • FIG. 4 shows the complete temperature sensor arrangement 1, the temperature sensor section 2 being accommodated in the sensor housing 7 and, as stated, preferably injected, although a separate assembly is also conceivable. It can be seen that the temperature sensor section 2 with the temperature sensor 3 protrudes slightly downwards from the sensor housing 7.
  • FIG. 5 shows a perspective view of a conductor bridge 14, with a curved base section 15, on which a plurality of connection sections 16 are formed, which serve to connect to ends of winding conductors.
  • the ladder bridge 14 is a simple sheet metal component that can be punched and bent accordingly.
  • a contact section 17 is provided which, as will be discussed below, can potentially come into thermal contact with the temperature sensor 3 when the temperature of this conductor bridge 14 is to be measured.
  • FIG. 6 shows an interconnection ring 18, comprising a housing 19, which is preferably made from a plastic potting compound and in which the conductor bridge 14 is embedded, in such a way that only the connection sections 16 protrude laterally from the housing 19.
  • the connection ring 18 is, as will be discussed below, placed axially on a winding in the area of axially protruding conductor ends that are to be connected to the connection sections 16.
  • brackets 20 are provided, which are used to locate or fix connection conductors, via which further conductor ends of the winding conductors are to be connected to connection terminals of an HV power supply.
  • brackets 20 which are designed as latching or clamping receptacles and allow the connecting conductors to be easily fixed, the connecting conductors are fixed over their length so that they are only subject to slight vibrations.
  • a corresponding housing receptacle for receiving the sensor housing 7 is formed, namely at a position at which with insertion of the sensor housing 7 in the housing receptacle either a direct thermal contact with a connecting conductor, which is in a Bracket 20 is received, is given, or with the contact section 17 of the conductor bridge 14.
  • FIG. 7 shows, in the form of a partial view, a basic illustration of an electrical machine 21 according to the invention comprising a stator 22 with a winding 23 comprising a plurality of conductors 24 which are assigned, for example, to three separate phases.
  • Each conductor 24 is designed, as it were, as a U-shaped bracket, a large number of such U-shaped conductors, often also called hairpins, being assembled to form the winding 23, which can also be drawn as a winding cage.
  • the multitude of conductors define different radial planes.
  • the conductors 24 extend depending on the winding scheme from one radial plane to another radial plane, for example an adjacent radial plane, in the area in which they end with the conductor are connected by corresponding adjacent conductors continuing the phase conductor.
  • the conductors 24 are guided or bent and laid in such a way that there are corresponding recesses that extend radially so that corresponding stator teeth 25 engage in these recesses or the corresponding conductors 24 are wound between the corresponding grooves of the stator teeth 25.
  • the basic structure of such a stator 22 or a winding 23 wound from the separate clamps described is basically known.
  • the circuit ring 18 comprises the plurality of connection sections 16 to which the conductor ends (not shown here) are to be connected, preferably to be welded. In this way, the individual conductor ends and thus the winding conductors are contacted with the conductor bridge 24 of the interconnection ring, so that the winding is connected here via the meandering conductor run.
  • conductor ends 26 which are in contact with conductor ends 27 of connecting conductors 28. These connecting conductors 28 contact the individual phases of the winding 23 with corresponding connection terminals of an HV power connection (not shown in more detail) via which the winding is energized.
  • HV power connection not shown in more detail
  • FIG. 7 shows, the connecting conductors 28 are accommodated in a holder 20 of the shuttering ring 18, they are pushed into the holder 20 coming from above and are locked or clamped therein.
  • a housing receptacle 29 is formed, into which the sensor housing 7 is to be inserted by pushing it, as shown by the arrow P.
  • FIG. 7 shows the situation in which the sensor housing 7 has not yet been pushed in. It can be seen that the exposed part of the temperature sensor section 2 runs free.
  • FIG. 8 shows the situation in which the sensor housing 7 together with the temperature sensor is inserted into the housing receptacle 29. The position is locked or clamped, for which purpose the spring arms 9 either clamp in lateral guides of the housing receptacle or the locking elements 10 lock in corresponding locking receptacles.
  • FIG. 9 shows a sectional view through the arrangement from FIG. 8. It can be seen that the exposed temperature sensor section 2 or the temperature sensor 3 is in direct thermal contact with a connecting conductor 28. It is spring-loaded against this connecting conductor 28 via the spring element 11 that is attached to the rear wall 30 of the housing receptacle 29 is supported.
  • the temperature sensor 3 can be reproducibly and precisely positioned and brought into thermal contact with a connecting conductor 28 in a simple manner. Disassembly is just as simple as assembly; in the event of maintenance, the sensor housing 7 only needs to be pulled out of the housing receptacle 29. The resilience also provides a defined thermal contact, so that a very precise measurement of the temperature of the connecting conductor 28 is possible.
  • FIG. 10 shows an embodiment of an electrical machine 21, the structure of which basically corresponds to that of FIGS. 7-9.
  • a connection ring 18 is placed on the winding 23 of the stator 22.
  • the housing receptacle 29 is not formed in the area of a holder 20, but rather at the end of the housing 19 of the interconnection ring 18, as FIG. 10 clearly shows.
  • the housing receptacle 29 is more or less open at the end, so that the sensor housing 7, as FIG. 10 shows, can be pushed in from the side. can.
  • the sensor housing 7 In the assembly position, which is shown in section in Figure 11, the sensor housing 7 is supported via the spring element 11, i.e.
  • the leaf spring on the wall delimiting the housing receptacle 29 on the upper side, so that the exposed temperature sensor section 2 or the temperature sensor 3 against the contact section 17, which is embedded in the plastic potting compound of the housing 19, is spring-loaded.
  • a direct thermal contact is given by simply pushing the sensor housing 7 into the housing receptacle 29, the sensor housing 7 also being supported here via the spring arms 9 in the housing receptacle 29 or jammed or latched therein.
  • the temperature sensor 3 is also supported here against influences such as media flows or the like that impair the measurement.
  • the housing receptacle Regardless of whether the housing receptacle is located in the area of a flange or in the area of the interconnection ring and thus the measurement of either the temperature of a connecting conductor or a conductor bridge takes place, there is always a direct winding-side measurement of the temperature of a current-carrying component that heats up during operation , possible, so that consequently the actual winding temperature can be detected in the area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)

Abstract

L'invention concerne une machine électrique comprenant un stator (22) comportant une bobine (23) qui comprend une pluralité de conducteurs (24) associés à une ou plusieurs phases, lesquels conducteurs sont branchés entre eux, la machine électrique comprenant en outre au moins un ensemble capteur de température (1) qui comprend une partie de capteur de température (2) comportant un capteur de température (3) destiné à détecter la température dans la zone de la bobine (23), caractérisée en ce que les extrémités d'au moins une partie des conducteurs (24) à la périphérie intérieure et/ou à la périphérie extérieure de la bobine (23) font saillie axialement ou radialement au-delà de la bobine (23). Un anneau de commutation (18) comprenant au moins un pont conducteur (14) est monté axialement ou radialement sur la bobine (23), au moins une partie des conducteurs (24) étant raccordée au dit pont conducteur (24), les extrémités (26) d'au moins deux conducteurs (24) associés à une phase faisant saillie radialement ou axialement vers l'extérieur, au moins un conducteur de liaison (28) étant raccordé aux dites extrémités, lequel conducteur de liaison est connecté à une prise électrique (14) disposée radialement à l'extérieur de la bobine (23). La partie de capteur de température (2) comporte un carter de capteur (7) inséré dans un logement de carter (29) monté sur l'anneau de commutation (18) de telle sorte que le capteur de température (3) est en contact thermique avec le conducteur de liaison (28) ou le pont conducteur (14).
EP20718549.7A 2019-04-26 2020-03-30 Machine électrique Withdrawn EP3959804A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019110835 2019-04-26
DE102019121198.0A DE102019121198A1 (de) 2019-04-26 2019-08-06 Elektrische Maschine
PCT/DE2020/100260 WO2020216405A1 (fr) 2019-04-26 2020-03-30 Machine électrique

Publications (1)

Publication Number Publication Date
EP3959804A1 true EP3959804A1 (fr) 2022-03-02

Family

ID=72839810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20718549.7A Withdrawn EP3959804A1 (fr) 2019-04-26 2020-03-30 Machine électrique

Country Status (5)

Country Link
US (1) US12155274B2 (fr)
EP (1) EP3959804A1 (fr)
CN (1) CN113748589A (fr)
DE (1) DE102019121198A1 (fr)
WO (1) WO2020216405A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021108495A1 (de) 2021-04-06 2022-10-06 Schaeffler Technologies AG & Co. KG Temperatursensorbaugruppe
JP7661812B2 (ja) * 2021-07-09 2025-04-15 株式会社プロテリアル 配線部品
DE102022101773A1 (de) 2022-01-26 2023-07-27 Schaeffler Technologies AG & Co. KG Sensorhalterung zum Halten eines Temperatursensors
DE102022112038A1 (de) 2022-05-13 2023-11-16 Ebm-Papst Mulfingen Gmbh & Co. Kg Sensorhalter zum Anpressen eines Temperatursensors an eine Wicklung eines Elektromotors
DE102022207562A1 (de) 2022-07-25 2024-01-25 Volkswagen Aktiengesellschaft Sensoranordnung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505557A1 (de) * 1995-02-18 1996-08-22 Mulfingen Elektrobau Ebm Verschaltungsanordnung für einen Elektromotor
EP2066008B1 (fr) * 2007-11-29 2011-08-03 Siemens Aktiengesellschaft Stator d'une machine dynamométrique doté de moyens d'enregistrement de la température
US8643243B2 (en) * 2009-12-23 2014-02-04 Kohler Co. Apparatus and method for electrically insulating end turns of a stator assembly
US9190888B2 (en) * 2012-04-13 2015-11-17 Globe Motors, Inc. Method of positioning a sensor within a motor assembly
DE102013214386A1 (de) * 2013-07-23 2015-01-29 Zf Friedrichshafen Ag Elektrische Maschine
FR3046505B1 (fr) * 2016-01-05 2018-02-16 Valeo Equipements Electriques Moteur Stator pour une machine electrique tournante
DE102019103191A1 (de) 2019-02-08 2020-08-13 Schaeffler Technologies AG & Co. KG Stator für eine elektrische Maschine

Also Published As

Publication number Publication date
US20220311312A1 (en) 2022-09-29
DE102019121198A1 (de) 2020-10-29
CN113748589A (zh) 2021-12-03
WO2020216405A1 (fr) 2020-10-29
US12155274B2 (en) 2024-11-26

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