WO2016134895A1 - Stator pour une machine électrique avec dispositif d'interconnexion scellé et machine électrique équipée d'un tel stator - Google Patents

Stator pour une machine électrique avec dispositif d'interconnexion scellé et machine électrique équipée d'un tel stator Download PDF

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Publication number
WO2016134895A1
WO2016134895A1 PCT/EP2016/051474 EP2016051474W WO2016134895A1 WO 2016134895 A1 WO2016134895 A1 WO 2016134895A1 EP 2016051474 W EP2016051474 W EP 2016051474W WO 2016134895 A1 WO2016134895 A1 WO 2016134895A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
receiving space
recesses
carrier element
coil ends
Prior art date
Application number
PCT/EP2016/051474
Other languages
German (de)
English (en)
Inventor
Alexander Schäflein
Jochen Wittmann
Matthias Weidner
Christoph Wieder
Stefan Reuter
Original Assignee
Zf Friedrichshafen Ag
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 Zf Friedrichshafen Ag filed Critical Zf Friedrichshafen Ag
Publication of WO2016134895A1 publication Critical patent/WO2016134895A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • 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 present invention relates to a stator for an electrical machine with a molded interconnection device according to the preamble of claim 1 and to an electric machine with such a stator.
  • a generic stator is for example already out of the
  • the stator of the permanent magnet synchronous machine described therein comprises a laminated stator core with a plurality of stator coils whose coil ends are interconnected by means of an interconnection device with three connecting conductors to form a delta connection.
  • the connecting conductors are arranged in a receiving space of a support element adjacent to the coils, wherein the coil ends are introduced into the receiving space by entry recesses provided on the support element and contacted with the connecting conductors within the receiving space.
  • a casting compound that is liquid at its processing temperature and solidifies on curing is introduced into the receiving space, which covers the elements arranged therein for protection against external influences, in particular the penetration of moisture and dirt particles.
  • the object of the invention is to provide a stator with a cost-effective interconnection device, wherein in particular a consumption of potting compound is reduced and while the interconnection device is nevertheless securely encapsulated against external influences. Furthermore, an electric machine should be provided with such a stator.
  • the switching device comprises an additional insert, which is arranged in the receiving space of the support member and which partially fills the receiving space.
  • This insert is designed so that it forms in the inserted or mounted state at predetermined positions free spaces to the arranged in the receiving space elements, such as connecting conductors, connecting conductors and coil ends.
  • the predetermined positions may preferably be the mutual contact areas and the entry areas of the elements in the carrier element.
  • the well-flowing at their processing temperature potting compound if intended, also in gap gaps, which may be present for example between the connecting conductors, the leads and the support member penetrate and also cover the elements located there with a film of the potting compound.
  • the potting compound can fill the existing open spaces completely or only partially.
  • a resin for example an epoxy resin, a silicone or a polyurethane can be used, the processing of which is familiar to the person skilled in the field of electrical engineering.
  • an area of the receiving space to be encapsulated is restricted to a size required for this purpose, whereby casting compound can be saved to a considerable extent and a stator can be produced at lower cost.
  • the insert can advantageously be designed such that it rests at least in sections on an inner wall region of the carrier element, in particular on a bottom region or on a separating web of the carrier element formed between two connecting conductors.
  • the insert can be designed as an insertable into the support element form-fitting part, which interacts with the carrier element substantially positive except for the above-mentioned open spaces.
  • Both the carrier ment as well as the insert can be inexpensively made of a plastic.
  • the insert can be both one-piece and multi-part, ie formed segmented.
  • the insert part for forming free spaces have corresponding recesses.
  • the recesses are formed in the region of the coil ends, in particular at the contact regions of the coil ends and / or at the inlet recesses of the coil ends.
  • the guided inside the receiving space coil wires from their entrance recesses can be mechanically fixed to the contact areas by the potting and simultaneously encapsulated, so that thereby a high reliability even at operational vibration of an electric machine can be achieved.
  • the coil ends can be sealed in the region of the inlet recesses on the carrier element or on an at least indirectly cooperating with the carrier element element.
  • a sealant is introduced between a coil end and the carrier element or the element interacting with it.
  • a stator coil may comprise a winding body, wherein the element cooperating with the carrier element is formed by a section of the winding body.
  • the sealing element can be fixed to a guide structure of the winding body for the coil ends, wherein the winding body in the region of the inlet recesses substantially gap-free abuts the carrier element.
  • it may also be sufficient to dimension the entry recesses relative to the coil ends in such a way that the optionally remaining gaps are bridged by the surface tension of the potting material.
  • connection conductors connected to the connection conductors, the recesses also being formed in the region of the connection conductors, which likewise are at least partially filled during the introduction of a potting material and cover or encapsulate the connection regions of the connection conductors with the connection conductors.
  • the connection conductors can be sealed to prevent the leakage of potting compound against the support member introduced into the receiving space.
  • the casting of the receiving space or the remaining free spaces after the interconnection of the coil ends and after inserting the insert into the support member through the through holes can be done up to a defined Vergussindi.
  • the recesses may also be formed closed on the open side of the receiving space.
  • the insert can form a closed surface and act as a lid to close the receiving space.
  • the introduction of a potting compound may in this case preferably take place before the arrangement of the insert on the carrier element.
  • the insert can therefore displace a still flowable potting compound when inserting.
  • carrier element and insert can positively, for example as a latching connection, non-positively, for example by means of a
  • the proposed electric machine comprises a rotor and a stator, wherein the stator is designed at least according to one of the combinations of features listed in the claims 1-8.
  • the invention will be explained by way of example with reference to an embodiment shown in the figures.
  • FIG. 1 shows a schematic representation of an internal-rotor-type electric machine with an interconnection device arranged radially on the inside of the stator in an axial section;
  • Fig. 2a is an enlarged view of the interconnecting device of Fig. 1;
  • FIG. 2b shows a section of the electrical machine illustrated in FIG. 1 with a connection device arranged radially on the outside of the stator;
  • FIG. 3 is a schematic fragmentary front view of the interconnecting device of FIG. 2a;
  • FIG. 4a shows an illustration of a one-piece insert part of an interconnecting device with recesses formed as passage openings
  • 4b shows a representation of a segmented, multi-part insert part of an interconnection device with recesses formed as passage openings
  • FIG. 5a shows a plan view of a connection device with an insert part shown with FIG. 4a;
  • 5b is a fragmentary sectional view of the interconnection of
  • Fig. 5c is a fragmentary sectional view of the interconnection of
  • FIG. 6 is a perspective view of the interconnection device according to FIG.
  • FIG. 7 is a perspective view of an insert part of an interconnecting device with a front side closed in the region of the coil ends,
  • FIG. 8a is a plan view of an interconnecting device with an insert shown in FIG. 7;
  • FIG. Fig. 8b is a fragmentary sectional view of the interconnection of
  • Fig. 8c is a fragmentary sectional view of the interconnection of
  • FIG. 8d is a perspective view of the interconnection device according to FIG.
  • Fig. 1 shows schematically an electric machine 10, more precisely a permanent magnet synchronous electric machine in internal rotor type, with a rotatable about a rotor shaft 12 rotor 14 and a radially outwardly surrounding stator 1 6.
  • the rotor 14 includes a cup-shaped rotor carrier 18, on the cylindrical Outer circumferential surface a laminated rotor core 20 is arranged, which carries a plurality of circumferentially spaced apart permanent magnets 22.
  • the stator 16 comprises an annular stator carrier 24, in the central recess of which an annular stator lamination stack 26 likewise formed from laminations is arranged.
  • the stator support 24 may, for example, constitute an outer or an intermediate housing of the electric machine 10.
  • the laminated stator core 26 is segmented and assembled from a plurality of identical, T-shaped stator segments, which are received by the stator carrier 24 and connected to the stator carrier 24. be held together.
  • the laminated stator core 26 may also consist of a stack of annular lamellae in a conventional manner.
  • the laminated stator core 26 forms a ring-shaped stator yoke 30, which adjoins the stator carrier 24 and has radially inwardly directed teeth 32 which are equipped with stator coils 36 in a known manner to form the stator winding.
  • the coil ends 36a, b of the stator coils 36 are connected by means of a switching device 38 shown only schematically in FIG. 1 and connected to power electronics, not shown in the drawing, which can act on the winding to drive the electrical machine 10 with a variable phase and amplitude current ,
  • stator coils 36 are wound before the assembly of the stator 1 6 by means of two, consisting of a heat-resistant plastic insulating or bobbins 40, 42 of a copper wire around the teeth 32 and are secured against slipping.
  • the bobbins 40, 42 each include a front side on the laminated core 26 adjacent base portion 40a; 42a and two of them approximately at right angles and on the stator 1 6 axially projecting leg 40b, c; 42b, c, which limit the winding area in the radial direction.
  • guide structures 41 are provided in the form of insertion grooves 41, in which the coil ends 36a, b inserted and aligned in the direction of the interconnection device 38.
  • sealing means 43 are arranged in the form of sealing elements 43 which seal the coil ends 36a, b with respect to the legs 40b.
  • the legs 40b are also substantially gap-free and thus in the present sense sealingly on the support member 56 and support this so. To secure the circumferential position, the legs 40b have recesses 40d which are open towards the carrier element 56, into which projections 56d of the carrier element 56 pointing in this direction engage in a form-fitting manner.
  • the coils 36 are electrically associated with individual strands, for which purpose the coil ends 36a, b are interconnected by means of the interconnection device 38 via common connection conductors 52a-c in a predetermined manner at contact regions.
  • the connection conductors 52a-c have over-connection areas 53a-c with respect to their base body or its extension plane.
  • each case two adjacent coil ends 36a, b are connected by two circumferentially adjacent coils 36 to a connection region 53 ac in order to realize a delta connection.
  • the contacting of the coil ends 36a, b with the connecting conductors 52a-c preferably takes place cohesively, for example by soldering or welding, wherein a coupled process heat in the direction of the winding region and the winding body can propagate.
  • the sealing means or the sealing elements 43 are temperature-resistant to this process heat, so that thereby the winding body 40 are securely protected from an undesirably high heat input and associated deformation.
  • connection conductors 52a-c are accommodated for their arrangement on the stator 1 6 inside a unilaterally open, trough-shaped receiving space 55 of an annular support element 56 formed of plastic and are there through
  • Dividers 56e arranged mutually electrically isolated.
  • the open area points into the stator 1 6 and also the rotor 14 facing away from the axial side and is thus freely accessible for the interconnection.
  • the carrier element 56 For interconnecting the coil ends 36a, b, the carrier element 56, optionally with the already inserted therein connecting conductors 52a-c, as shown schematically in Fig. 1, arranged on the stator 1 6 and there, for example by means of a drawing connection, not shown on the legs of Bobbin set.
  • FIGS. 2 a and 2 b show two exemplary embodiments for the arrangement of the interconnecting device 38 on the stator, which differ in particular with regard to the position of the carrier element 56 and the guidance of the coil ends 36 a, b. The following explanations relate to the embodiment of FIG. 2a in the near future.
  • entrance recesses 56d are provided in the radial wall region 56b (FIGS. 2a, 3). These are formed as trough-shaped or slot-like depressions and with respect to the stator 1 6 starting from the free axial side of the side wall 56b and arranged so that guided in the guide structure 41 coil ends 36a, b radially and on a relatively short path through the radial wall portion 56b in the receiving space 55 of the interconnection arrangement 38 can be inserted.
  • the entrance recesses 56d are made slightly larger in the circumferential direction than corresponds to the mutual distance of two adjacent coil ends of the stator 16 each of two immediately adjacent coils. As a result, in the position shown, the coil ends 36a, b can be securely inserted into the carrier element 56 even with a small positional deviation.
  • the interconnecting device 38 as shown schematically and by way of example in the lower part of FIG. 3, furthermore has connecting leads 60a-c connected to the electrical conductors to the connecting conductors 52a-c for connection of the stator 16 to those which are sealed relative to the carrier element 56 are inserted through the side wall 56c in the receiving space 55.
  • the interconnecting device 38 is located radially inside the coils 36 on the stator 16, wherein the coil ends 36a, b are already deflected from the axial direction into the radially inner direction on the winding body 40 .
  • FIG. 2b An alternative arrangement with a comparison with the Fig. 2a slightly modified support member 56 is shown in Fig. 2b.
  • the interconnecting device 38 is located radially outside the coils 36 on the stator 16 and the coil ends 36a, b initially come axially out of the way.
  • ckelkorper 40 out and also axially in the support member 56 a. The deflection of the coil ends 36 in the radially outer direction takes place within the receiving space 55 of the support member 56th
  • the receiving space 55 of the carrier element 56 is at least partially involved after the interconnection has taken place, in order to protect the elements arranged within the receiving space 55 from external influences, in particular against corrosion phenomena and likewise to increase the stability of the interconnecting device 38 potted or encapsulated.
  • the interconnection device 38 has a below-explained, in particular ring-shaped insert 62 made of plastic, which is arranged in the receiving space 55 of the support member 56 and which partially fills the receiving space 55.
  • FIGS. 4-6 show a first embodiment and FIGS. 7-9 show a second embodiment of an insert 62 for arrangement in a carrier element 56, which in the present case is designed in particular according to FIG. 2b.
  • Fig. 4a shows a one-piece insert part 62 of an interconnecting device 38, which is designed here as an open ring.
  • the open peripheral portion 62a of the insert 62 is provided for the arrangement of leads 60a-c.
  • the insert 62 has in its radially inner region an annular space 62b with a plurality of circumferentially spaced and radially outwardly extending pockets 62c.
  • the annular space 62b is trough-shaped and lies at least in sections with a bottom portion 62d at a radially inner bottom portion 561a and an inner wall portion 62e at a wall portion 561 b of the support member 56 at.
  • the annular space 62b constitutes a casting-free area in which no potting compound can enter during the subsequent potting.
  • the annular space 62b is replaced by an intermediate wall Area 62f safely separated from a filled with potting compound or filled area.
  • annulus 62b Radially outside of this annulus 62b are formed a plurality of circumferentially spaced and generally designated reference numerals recesses 64, which are designed in the form of recesses 641 radially outwardly open and in the form of recesses 642 have an outer boundary 642a and thus are radially closed. Both types of recesses 641, 642 are open in the axial direction, that is, designed as passage openings.
  • FIG. 4a It can also be seen in FIG. 4a that a space region 62h is spanned on the circumference between in each case two pockets 62c.
  • the inlet openings or recesses 56d for the coil ends 36a, b are arranged in this space region 62h, which can enter into the recesses 641/642 at these positions in the carrier element 56 and then radially staggered in the direction of here Connecting conductors 52a-c may extend to their respective contact area.
  • the free spaces 641/642 formed by the recesses 64 are potted after the connection with a hardenable potting compound 66, whereby the coil ends 36a, b, the connection conductors 52a-c and the connection conductors 60a-c are covered or encapsulated at least at mutual contact areas.
  • FIG. 5a shows a plan view of a Verschaltungsseinnchtung 38 with an insert 62 shown in Fig. 4a and Fig. 5b
  • c is a fragmentary sectional view of this Verschaltungseinnchtung 38 inside and outside a potted Contact area of the coil ends 36a, b.
  • FIG. 6 shows a perspective view of the interconnecting device 38 according to FIGS. 5a-c.
  • FIG. 4b shows a segmented insert 62 consisting of several separate segments 620.
  • joints are each formed in the region of the open recesses 641, so that the annular space 62b is segmented.
  • the other structure corresponds to that of Fig. 4a.
  • FIG. 7 shows a perspective illustration of an insert 62 of an interconnecting device 38 having a surface which is closed on the end side in the region of the coil ends 36a, b.
  • This insert 62 is presently designed as a closed ring, which additionally has recesses 62i for the passage of the leads 60a-c.
  • a space region formed by the recesses 64 extending radially between the intermediate wall portion 62f and the outer rim 642a is closed at the open side of the receiving space 55 by a cover plate portion 62k.
  • the insert 62 is located on the carrier element 56 with radially outer and inner bearing portions 62I, m.
  • the further construction of this insert 62 basically corresponds to that of FIG. 4a.
  • FIG. 8a shows a plan view of an interconnecting device 38 with an insert 62 shown in FIG. 7.
  • FIGS. 8b, c respectively show a fragmentary sectional illustration of this interconnection device 38 inside and outside a contact region of coil ends 36a, b and FIG. 8d perspective view of this interconnection 38.
  • the inserts 62 are each connected to the carrier element 56 by means of snap-in connections which are not illustrated in the drawing.
  • the Einlegmaschine can also be determined in other ways on the carrier element, for example, by the adhesive effect of the potting compound used.
  • these can also be arranged axially staggered to the stator, wherein the other elements, if they are required, are adapted accordingly.
  • a radial positioning of the coils to the carrier element of the interconnection device these also take place in the axial direction.
  • the special design of the electrical machine with respect to the basic design of the stator interconnection device is irrelevant; For example, it may also be an external-type electric machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

L'invention concerne un stator (16) pour une machine électrique (10), lequel comprend un empilage de tôles de stator (26) muni de bobines de stator (36) et un dispositif d'interconnexion (38) muni d'un élément support (56) en forme de cuvette. Les extrémités de bobine (36a, b) des bobines de stator (36) sont ici introduites dans un cadre d'accueil (55) ouvert d'un côté de l'élément porteur (56) et interconnectées avec des conducteurs de liaison (52a-c) qui s'y trouvent au niveau de zones de contact. Selon l'invention, l'encapsulation de l'ensemble est réalisé en formant le dispositif d'interconnexion (38) avec une pièce à insérer (62) qui est disposée dans l'espace d'accueil (55) de l'élément support (56) et qui remplit partiellement l'espace d'accueil (55). La pièce à insérer (62) forme, à des positions prédéfinies, des espaces libres (64) pour les éléments (36a, b ; 52a-c ; 60a-c) disposés dans l'espace d'accueil (55) et une masse de scellement (66) est introduite dans les espaces d'accueil (64).
PCT/EP2016/051474 2015-02-25 2016-01-26 Stator pour une machine électrique avec dispositif d'interconnexion scellé et machine électrique équipée d'un tel stator WO2016134895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015203346.5A DE102015203346A1 (de) 2015-02-25 2015-02-25 Stator für eine elektrische Maschine mit einer vergossenenen Verschaltungseinrichtung und elektrische Maschine mit einem solchen Stator
DE102015203346.5 2015-02-25

Publications (1)

Publication Number Publication Date
WO2016134895A1 true WO2016134895A1 (fr) 2016-09-01

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PCT/EP2016/051474 WO2016134895A1 (fr) 2015-02-25 2016-01-26 Stator pour une machine électrique avec dispositif d'interconnexion scellé et machine électrique équipée d'un tel stator

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DE (1) DE102015203346A1 (fr)
WO (1) WO2016134895A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009045551A1 (de) * 2008-11-05 2010-05-06 Zf Friedrichshafen Ag Stator für eine elektrische Maschine mit einer Verschaltungseinrichtung
WO2013076442A2 (fr) * 2011-11-22 2013-05-30 Cummins Generator Technologies Limited Raccordement d'une machine électrique tournante

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009045551A1 (de) * 2008-11-05 2010-05-06 Zf Friedrichshafen Ag Stator für eine elektrische Maschine mit einer Verschaltungseinrichtung
WO2013076442A2 (fr) * 2011-11-22 2013-05-30 Cummins Generator Technologies Limited Raccordement d'une machine électrique tournante

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Publication number Publication date
DE102015203346A1 (de) 2016-08-25

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