WO2021180267A1 - Stator pour machine à flux axial, procédé de fabrication de stator pour machine à flux axial et machine à flux axial - Google Patents

Stator pour machine à flux axial, procédé de fabrication de stator pour machine à flux axial et machine à flux axial Download PDF

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Publication number
WO2021180267A1
WO2021180267A1 PCT/DE2021/100142 DE2021100142W WO2021180267A1 WO 2021180267 A1 WO2021180267 A1 WO 2021180267A1 DE 2021100142 W DE2021100142 W DE 2021100142W WO 2021180267 A1 WO2021180267 A1 WO 2021180267A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
stator housing
housing
stator tooth
tooth
Prior art date
Application number
PCT/DE2021/100142
Other languages
German (de)
English (en)
Inventor
Matthias Gramann
Holger Witt
Original Assignee
Schaeffler Technologies AG & 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 & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2021180267A1 publication Critical patent/WO2021180267A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors

Definitions

  • Stator for an axial flux machine Method for manufacturing a stator and axial flux machine
  • the present invention relates to a stator for an axial flux machine that can be operated electrically, as a motor and / or generator, in particular a stator for an axial flux machine designed as a drive machine of a motor vehicle, comprising a plurality of stator teeth, at least a plurality of the plurality of stator teeth each having a stator tooth body and at least in each case have a stator tooth coil arranged at least in regions around the stator tooth body. Furthermore, the stator comprises a stator housing which surrounds the stator tooth bodies and the stator tooth coils and which is designed to accommodate a coolant.
  • the invention also relates to a method for producing a stator for an axial flux machine and an axial flux machine with a stator designed according to the invention.
  • EP 2632027 B1 describes an axial flux machine, comprising a stator, a cooling jacket within the stator for cooling the stator, and stator windings around the stator and the cooling jacket, the cooling jacket having a plurality of ribs which extend over the circumference of the The stator extend out, with the fins defining slots that receive the stator windings and the fins act as heat sinks for the stator windings.
  • the magnetic flux in an electric motor designed as an axial flux motor is axially directed in the air gap between the stator and rotor.
  • a laminated rotor for high speeds and frequencies is layered in the axial direction.
  • soft magnetic composite material - which is also referred to as SMC material (soft magnetic components, soft magnetic compounds / soft magnetic powder) - is used as the material for flux guiding elements, since here a three-dimensional propagation of the magnetic flux without significant eddy currents is possible is.
  • SMC material soft magnetic components, soft magnetic compounds / soft magnetic powder
  • a homogeneous SMC rotor is possible for smaller rotors as long as the mechanical load does not exceed the low strength of the SMC.
  • the SMC material usually consists of highly pure iron powder, which has a special surface coating on each individual particle. The electrically insulating surface achieved in this way ensures a high electrical resistance, which is retained even after pressing and heat treatment. Eddy current losses are therefore practically negligible.
  • the invention is based on the object of providing a stator or a structure of a stator for an axial flux machine and an axial flux machine and to specify a method for producing a stator for an axial flux machine, as a result of which the properties of the stator are optimized with regard to the cooling of its components.
  • An axial flux machine designed according to the invention comprises a plurality of stator teeth, at least a plurality of the plurality of stator teeth each having a stator tooth body and at least one stator tooth coil arranged at least regionally around the stator tooth body. Furthermore, the axial flux machine comprises a stator housing which encloses the stator tooth bodies and the stator tooth coils or at least in certain areas surrounds and which is designed to receive a coolant. According to the invention, the stator housing for receiving the coolant is designed in such a way that at least one of the plurality of stator teeth has a first or inner cooling volume, which is formed between the stator tooth body and the stator tooth coil surrounding the stator tooth body, whereby further improved cooling of the stator is achieved will. In particular, the advantage is achieved that the stator tooth body and the stator tooth coil can be cooled exclusively or additionally radially from the inside.
  • a “plurality” of stator teeth is understood to mean more than one stator tooth - and not the majority of stator teeth in the sense of more than half of all stator teeth.
  • each stator tooth body or just every second or every third stator tooth body can have a stator tooth coil.
  • stator tooth coil is arranged at least in some areas around a stator tooth means, in the context of the invention, that at least one electrical conductor is arranged between the stator teeth and extends in the axial or radial direction.
  • individual stator teeth are provided with stator tooth coils with several windings.
  • stator tooth coils are designed differently and are arranged differently between the stator tooth bodies than in the exemplary embodiments of this invention shown.
  • the stator housing comprises at least a first stator housing part and a second stator housing part which have a common joining contour, the at least first stator housing part and the second stator housing part via joining contact surfaces of the first stator housing part and corresponding joining contact surfaces of the second housing part are non-positively and / or positively and / or cohesively connected to one another.
  • the separation of the Stator housing parts are preferably carried out in the axial direction, that is to say in a parting plane which, for example, extends perpendicularly or obliquely or stepped or the like to the rotor axis of rotation of the axial flow machine. A particularly simple assembly of the stator can be guaranteed by this structure.
  • stator housing for receiving the coolant is designed in such a way that at least one of the plurality of stator teeth has a second or outer cooling volume which is formed outside the stator tooth winding. This further improves the cooling of the stator.
  • stator tooth coil is wound in such a way that individual wire turns of the stator tooth coil are spaced apart from one another in the axial direction by gaps, viewed in cross section.
  • connector cooling channels can be formed which connect the respective inner cooling volume of a stator tooth with the respective outer cooling volume and in this way ensure a further improved exchange of the coolant.
  • the resulting increase in the surface to be cooled also improves the cooling considerably.
  • the stator housing is arranged in a section in the axial direction, seen along the longitudinal axis X of the stator tooth, between the inner coil winding side and the radially inner housing wall of the stator housing, an inner supply channel for supplying the inner Has cooling volume and / or the outer cooling volume.
  • the invention can also be further developed to the effect that the stator housing for at least one of the plurality of stator teeth Magnetic flux conducting flux guiding element is integrated, wherein the flux guiding element is formed in one piece and extends in the axial direction within a stator tooth.
  • the advantage of this embodiment is that, because the flux guide element is firmly integrated into the stator housing and the stator housing penetrates completely in the axial direction, no further housing walls are required axially outwards.
  • a flux guiding element which conducts the magnetic flux is integrated into the stator housing in at least one of the plurality of stator teeth, the flux guiding element being formed in several parts, in particular in two parts, and at least two of the flux guiding element parts in this way inside of the stator housing, so that the at least two flux guide element parts are in contact with the magnetic flux in a conductive manner.
  • stator housing is formed from plastic or plastic composite, in particular a thermoplastic material.
  • thermoplastic materials can now be used for the stator housing. Thermoplastic materials, on the other hand, can be processed very well - in particular, they can also be welded to one another.
  • At least one, preferably each stator tooth coil of a stator tooth of the plurality of stator teeth has an electrical coil connection for electrical contacting.
  • the coil connection is arranged in the area of the joining contour between the first stator housing part and the second stator housing part, which also simplifies the assembly and manufacture of the stator.
  • the invention can also be implemented in an advantageous manner to the effect that between the first stator housing part and the second Stator housing part at least one intermediate element is arranged, the intermediate element being designed as an element for stabilizing the stator housing and / or as an element for providing an electrical connection to the stator tooth coil and / or as an element for sealing the stator housing.
  • An intermediate element designed as a stabilizing element is used for stiffening, calibration, for. B. the roundness.
  • An intermediate element designed as a sealing element is used, for example, to seal between the stator housing parts.
  • the intermediate elements can also be integrated into the shells or stator housing parts.
  • the object of the invention is achieved by a method for manufacturing a stator, comprising the method steps of providing at least a first stator housing part and a second stator housing part of a stator housing, the two stator housing parts having a common joining contour; Providing a plurality of stator tooth bodies, a plurality of stator tooth coils and intermediate elements and assembling the same in at least one of the stator housing parts; and assembling and joining the at least two stator housing parts by bringing them together and non-positively and / or positively and / or materially connecting the two stator housing parts.
  • an axial flux machine comprising a stator designed according to the invention as well as at least one rotor arranged at a distance from the stator via an axial air gap and arranged non-rotatably on a rotor shaft.
  • the stator is preferably arranged on the one hand rotatably mounted on the rotor shaft via roller bearings and on the other hand is fixed in place via an external abutment.
  • a central supply cooling channel is provided in the rotor shaft, which branches off radially outward in particular between the two roller bearings axially spaced apart on the rotor shaft and serves to supply the inner cooling volume and / or the outer cooling volume.
  • this axial flux machine also comprises at least one rotor arranged non-rotatably on the rotor shaft, spaced apart via an axial air gap - particularly preferably, the axial flow machine has a rotor arranged non-rotatably on the rotor shaft on both sides via an axial air gap.
  • a central cooling supply channel is provided within the rotor shaft, which branches off radially outward in particular between the two roller bearings axially spaced apart on the rotor shaft and serves to supply the inner cooling volume and / or the outer cooling volume of the stator.
  • the central supply cooling channel is advantageously designed in such a way that cooling channels formed in the rotor or in the rotors are also supplied with coolant via it (see FIG. 6).
  • FIG. 1 shows an axial flow machine according to the prior art in an H-arrangement in a schematic representation
  • FIG. 2 shows a stator for an axial flux machine according to the invention in a partial section in a plane running through the axis of rotation of a rotor of the axial flux machine, in the upper illustration in the unassembled or not joined state and in the lower illustration in an assembled or joined state Stator housing parts or halves,
  • FIG. 3 shows a stator for an axial flux machine according to the invention, at the top in a partial section in a plane running perpendicular to an axis of rotation of a rotor of the axial flux machine, and at the bottom in a sectional plane B-B according to the illustration above,
  • FIG. 4 shows the stator for an axial flux machine according to the invention, as shown in the partial sectional views in FIG. 2 (bottom) and FIG. 3 (bottom), the course of the cooling medium being shown here by way of example, and FIG. 4
  • FIG. 5 shows an axial flow machine according to the invention in one possible embodiment in an axial section along the rotor shaft.
  • FIG. 1 shows an axial flow machine 2 according to the prior art in an H-arrangement in a schematic representation.
  • a structure of an axial flux machine is referred to as an H-arrangement in which two axially spaced rotors 17 enclose a stator 1 between them.
  • the axial flux machine 2 shown comprises two rotors 17 and a stator arranged centrally between the two axially spaced apart rotors 17 via an air gap 1.
  • the stator 1 is shown schematically and without a housing 6; only a plurality of stator teeth 3 arranged circumferentially next to one another and forming the stator 1 are shown, each stator tooth 3 having a stator tooth body 4 and a stator tooth coil 5 wound onto the stator tooth body 4.
  • stator 1 Via the stator tooth coils 5, the stator 1 can be acted upon by an electrical circumferential rotating field, the electrical current being the Stator tooth coils 5 each generate a magnetic field which is correspondingly amplified via the respective stator tooth body 4.
  • the two axially outwardly arranged rotors 17 are also shown only schematically and here comprise a carrier on which magnet elements (in the form of permanent magnets) and flux guide elements (made for example from electrical sheet and / or SMC material) are arranged at a circumferential distance and alternating one after the other.
  • FIG. 2 shows a stator 1 constructed according to the invention for an axial flux machine 2 in a partial section.
  • the upper half of a section through the stator 1 is shown.
  • the partial section runs in a plane which runs through the axis of rotation Xrot of a rotor 17 of the axial flux machine 2.
  • the stator 1 is shown in the unassembled or not joined state, while in the lower illustration it is shown in an assembled or joined state of the stator parts or stator housing parts 61; 62 is shown.
  • the stator housing 6 is designed in two parts, each of the two stator housing parts 61; 62 accommodates a flux guiding element part 13 integrated in itself (for example by injection, gluing or pressing).
  • stator tooth body 4 is also formed in two parts here and is preferably formed from two flux guide element parts 13 made of pressed SMC material.
  • One of the two flux guide element parts 13 is in each case in an axial end face of the stator housing 6 or in an axially outer end face of one of the two stator housing parts 61; 62 integrated.
  • stator tooth body parts stand axially inward into the interior of the housing and are dimensioned in their axial length such that they are in the joined state of the two stator housing parts 61; 62 are conductively connected or contacted with the magnetic flux with integrated flux guide element parts 13.
  • a stator tooth coil 5 with a coil connection 14 for making electrical contact with the stator tooth coil 5 is arranged around the stator tooth body 4 formed by the flux guide elements 13.
  • the coil connection 14 is received via an intermediate element 15, which can be designed as a plate-like stiffening element, and via this positioned and fixed within the stator housing 6.
  • stator housing parts 61; 62 corresponding recesses are provided into which the intermediate element 15 in the joined state of the stator housing parts 61; 62 is recorded.
  • the coil connection 14 is arranged in such a way that it is in the area of the common joining contour - that is, between the first and second stator housing part 61; 62 lying - is formed.
  • further elements for interconnecting the stator tooth coils 5 can be arranged in the area of the coil connection 14 within the stator housing 6.
  • a piping or formation of cooling channels for guiding a coolant is formed in an integrated manner. In the event that the stator housing parts 61; 62 are manufactured by means of injection molding, parts of this piping or cooling channels cannot be manufactured in a one-step manufacturing process - remaining openings must be subsequently closed by cover parts (see FIG. 3).
  • FIG. 3 shows a stator 1 for an axial flux machine 2 according to the invention, at the top in a partial section in a plane running perpendicular to an axis of rotation Xrot of a rotor 16 of the axial flux machine 2, and at the bottom in a sectional plane BB according to the illustration above.
  • the arrangement of the cooling channels provided can be clearly seen in these representations.
  • a first inner cooling volume 7 is formed between the stator tooth body 4 and stator tooth coil 5 in the form of an inner annular channel and the outside around the stator tooth coil 5 a second outer cooling volume 8 is also formed in the form of an annular channel.
  • the inner cooling volume 7 and the outer cooling volume 8 are connected to one another via individual connector cooling channels 9.
  • the connector cooling channels 9 are formed in axially running intermediate spaces between two adjacently arranged turns of the stator toothed coil 5.
  • radially extending cooling channels or sections of cooling channels here: sections of the supply channel 11 for supplying the first inner cooling volume 7 and the second outer cooling volume 8 extend.
  • the smaller detail section shows how openings of cooling channels can be closed in a downstream manufacturing step by means of a separate cover part.
  • FIG. 4 shows the stator 1 for an axial flux machine 2 according to the invention, as shown in the partial sectional views in FIG. 2 (lower illustration) and FIG. 3 (lower illustration), the course of the cooling medium being shown here by way of example.
  • the cooling channels are preferably designed within the stator housing in such a way that the cooling medium, for example designed as a fluid, always flows around the current conductors of the coil from the inside to the outside (fluid direction normal to the current direction).
  • the fluid enters an annular cooling channel P2 at P1 and flows through the entire 360 ° of the motor in an annular manner.
  • the fluid is transferred to another ring channel P3, which also distributes the cooling medium over 360 degrees.
  • a plurality of inlets for the cooling medium can preferably also be provided. From the ring channels P2; P3, the fluid is guided radially inward into the coil ring channel P5 in relation to the axial flow machine 2 in the cooling channels P4, which are arranged, for example, in a radial manner, where the fluid is distributed in the axial direction P6 in the inner cooling volume 7 and in the outer cooling volume 8. From there, it is routed radially with respect to the stator tooth coil 5, usually normal to the direction of the electric current in the direction P7 to the coil outer channel P8.
  • This outer coil channel P8 is advantageously also designed as an annular channel around the stator tooth coils 5 and at the same time serves as an outflow via at least one outflow channel.
  • FIG. 5 shows an axial flux machine 2 according to the invention in a possible embodiment in an axial section along the rotor shaft 16.
  • the axial flux machine 2 shown comprises a stator 1, as has already been described above, with the difference that the stator 1 shown in FIG Embodiment in its radially inner housing wall 10, axially arranged approximately in the center, a radially in the direction of the rotor shaft 16 extending outward having central coolant supply channel K for the supply and / or discharge of a coolant.
  • the coolant supply channel K can also be designed as a double channel for the simultaneous supply and removal of coolant.
  • This coolant supply channel K is fed via a central supply cooling channel 19 which extends in the rotor shaft 16 in an essentially axial direction.
  • This central supply cooling channel 19 can also be designed twice for the simultaneous supply and removal of coolant.
  • the central supply cooling channel 19 and the coolant supply channel K formed in the housing wall 10 of the housing 6 are connected to one another via a supply connector channel V.
  • the supply connector channel V is designed as an annular channel between two roller bearings 18, via which the stator 1 is rotatably arranged on the rotor shaft 16.
  • the central supply cooling channel 19 additionally feeds the rotor 17 or rotors 17 which are also arranged on the rotor shaft 16.
  • joint contact surface first stator housing part
  • second stator housing part second stator housing part

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un stator (1) destiné à une machine à flux axial (2), en particulier un stator (1) destiné à une machine à flux axial conçue comme une machine d'entraînement d'un véhicule automobile, ayant un grand nombre de dents de stator (3), au moins une pluralité du grand nombre de dents de stator (3) ayant chacune un corps de dent de stator (4) et au moins une bobine de dent de stator (5) qui est disposée autour du corps de dent de stator (4), et un boîtier de stator (6) qui entoure les corps de dent de stator (4) et les bobines de dents de stator (5) et qui est conçu pour recevoir un agent de refroidissement. Selon l'invention, le carter de stator (6) est conçu pour recevoir l'agent de refroidissement de telle sorte qu'au moins un volume de refroidissement interne (7) est formé entre le corps de dent de stator (4) et la bobine de dent de stator (5) qui entoure le corps de dent de stator (4).
PCT/DE2021/100142 2020-03-12 2021-02-12 Stator pour machine à flux axial, procédé de fabrication de stator pour machine à flux axial et machine à flux axial WO2021180267A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020106775.5 2020-03-12
DE102020106775.5A DE102020106775A1 (de) 2020-03-12 2020-03-12 Stator für eine Axialflussmaschine, Verfahren zur Herstellung eines Stators und Axialflussmaschine

Publications (1)

Publication Number Publication Date
WO2021180267A1 true WO2021180267A1 (fr) 2021-09-16

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Application Number Title Priority Date Filing Date
PCT/DE2021/100142 WO2021180267A1 (fr) 2020-03-12 2021-02-12 Stator pour machine à flux axial, procédé de fabrication de stator pour machine à flux axial et machine à flux axial

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WO (1) WO2021180267A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010092400A2 (fr) * 2009-02-13 2010-08-19 Isis Innovation Ltd Machine électrique - refroidissement
GB2482928A (en) * 2010-08-19 2012-02-22 Oxford Yasa Motors Ltd Over-moulding construction of an electric machine stator
DE102014222121A1 (de) 2014-10-29 2016-05-04 Robert Bosch Gmbh Kühlkanäle in gewickeltem Stator
GB2546255A (en) * 2016-01-07 2017-07-19 Mclaren Automotive Ltd Cooling electric machines
EP3214735A1 (fr) * 2014-10-27 2017-09-06 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Moteur sans balais à entrefer axial de type à rotor extérieur
EP2632027B1 (fr) 2008-07-16 2017-12-27 Cummins Generator Technologies Limited Machine à flux axial

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB626823A (en) 1947-09-01 1949-07-21 British Thomson Houston Co Ltd Improvements relating to the windings of dynamo-electric machines
US6933633B2 (en) 2001-10-03 2005-08-23 Nissan Motor Co., Ltd. Rotating electric machine and cooling structure for rotating electric machine
EP3127225B1 (fr) 2014-04-02 2018-08-22 J.H. Beheer B.V. Module de stator d'une machine électrique de type à rotor à aimants permanents

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2632027B1 (fr) 2008-07-16 2017-12-27 Cummins Generator Technologies Limited Machine à flux axial
WO2010092400A2 (fr) * 2009-02-13 2010-08-19 Isis Innovation Ltd Machine électrique - refroidissement
GB2482928A (en) * 2010-08-19 2012-02-22 Oxford Yasa Motors Ltd Over-moulding construction of an electric machine stator
EP3214735A1 (fr) * 2014-10-27 2017-09-06 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Moteur sans balais à entrefer axial de type à rotor extérieur
DE102014222121A1 (de) 2014-10-29 2016-05-04 Robert Bosch Gmbh Kühlkanäle in gewickeltem Stator
GB2546255A (en) * 2016-01-07 2017-07-19 Mclaren Automotive Ltd Cooling electric machines

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