EP4226477A1 - Stator pour moteur à flux axial ayant une liaison par emboîtement et par friction et un moteur à flux axial en agencement en i et refroidissement direct en ligne - Google Patents

Stator pour moteur à flux axial ayant une liaison par emboîtement et par friction et un moteur à flux axial en agencement en i et refroidissement direct en ligne

Info

Publication number
EP4226477A1
EP4226477A1 EP21791250.0A EP21791250A EP4226477A1 EP 4226477 A1 EP4226477 A1 EP 4226477A1 EP 21791250 A EP21791250 A EP 21791250A EP 4226477 A1 EP4226477 A1 EP 4226477A1
Authority
EP
European Patent Office
Prior art keywords
stator
flange
axial flux
flux motor
stator core
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.)
Pending
Application number
EP21791250.0A
Other languages
German (de)
English (en)
Inventor
Holger Witt
Michael Menhart
Stefan Riess
Johann Oswald
Carsten Sonntag
Andrä Carotta
Daniel Mahler
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 EP4226477A1 publication Critical patent/EP4226477A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/182—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to stators axially facing the rotor, i.e. with axial or conical air gap
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • 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
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the invention relates to a stator for an axial flux motor, which can also be referred to as an axial flux machine, e.g. in an I arrangement and with high power density for use in a travel drive, with a preferably stamped and/or coated/wound stator lamination stack that is mounted on a flange is attached.
  • an electric axial flux machine comprising an ironless disk-shaped rotor arranged on a machine shaft and two stators arranged next to the rotor.
  • the rotor has permanent magnets embedded in a fiber or fabric-reinforced plastic.
  • the permanent magnets are each positively connected to the surrounding plastic. Together with the permanent magnet and the machine shaft, the plastic forms a dimensionally stable unit.
  • An electromagnetic motor or generator with two rotors, four stators and an integrated cooling system is also known, for example from EP 3 738 199 A1.
  • an electric drive train is also known from the prior art.
  • Such an electric drive train consists of components for energy storage, energy conversion and energy transmission.
  • the energy conversion components include electrical machines, such as axial flow machines.
  • axial flow machines are also known in principle from the prior art in various designs with one or more stators and one or more rotors.
  • Axial flux machines can be operated as axial flux motors.
  • stators are connected to the surrounding supporting structure in various ways. This can be, among other things, radial shrinking/pressing into a housing, screwing axially to a housing and/or bearing flanges using screws, or other solutions. It is also possible to provide geometries on the laminated section of the stator that are intended exclusively for fastening it and do not affect the electromagnetically relevant area.
  • the torque transmission caused by the motor torque, is accompanied by a superimposed force component acting in the axial direction, which can also be derived from the surrounding load-bearing structure.
  • the geometry of the stator is generally reduced to the electromagnetic function. No additional geometry elements are provided on the stator here in order to fasten it.
  • stators are glued flat on the yoke side or screwed instead, namely both from the yoke side and from the pole side. Screw connections of this type lead to additional losses or reduced machine performance. Shrinkage of the laminated core is hardly possible due to its low intrinsic stability, especially at higher powers / torques.
  • stator core has a rear side / pole side that is positively and non-positively attached to a front side of the flange and / or a (extending in the radial direction) cooling channel between the stator core and the Flange is formed in the area of attachment.
  • the solution to the problem consists in realizing a combination of positive and non-positive locking between the laminated stator core and the housing/flange located on its yoke side.
  • radial grooves are introduced on the yoke side of the laminated core of the stator.
  • these have the same number and tangential (angular) position as the pole centers (number of winding slots) on the opposite pole side.
  • the pole centers number of winding slots
  • the surface adhesive connection acoustically decouples the stator core and the housing, which leads to a reduction in motor noise.
  • a special design of the slot in the laminated core of the stator can be achieved by providing a stepped design. Due to the stepped design of the groove in the Stator laminated core forms a channel that runs on the yoke side from the inner diameter of the laminated core to the outer diameter of the laminated core. In the current version, this serves as a return channel for the cooling medium used, such as oil, and cools the stator at the same time.
  • the steps of the groove are selected in such a way that they determine the axial position of the stator lamination stack on the pole side (air gap to the rotor) and also set the adhesive gap in a controlled manner.
  • the invention also relates to such a method, namely an assembly method, just like a cooling method.
  • the flange is designed as a housing or housing component. This facilitates embedding in a travel drive.
  • stator lamination packet It is useful if there are grooves / indentations / recesses on the back that are in a form fit with (partially / completely) opposite elevations / elevations / ribs.
  • the rear / pole side of the stator lamination packet is therefore cleverly prepared in order to achieve a form fit with the front of the flange / housing that is as square as possible. The result is good power transmission.
  • the longitudinal extent of the grooves/indentations/recesses extends in the radial direction and/or the elevations/prominences/ribs extend in the radial direction in their longitudinal extent. It is advantageous if the same pitch is maintained for both the grooves and the elevations. This means that the same angular subdivision is used.
  • An advantageous embodiment is also characterized in that a (preferably each) groove / indentation / a (each) recess has its part / in turn a channel / a channel, which is covered by the ridge / elevation / rib but unfilled to a cooling - To allow hydraulic fluid line. The dissipation of energy, either from the center or to the center, namely thermal energy, is thereby facilitated.
  • the groove has a wall facing the inside of the groove, which acts as a stop for a counter-stop provided by the elevation.
  • An advantageous embodiment is also characterized in that an adhesive gap present between the rear side of the laminated stator core and the front side of the flange is filled/filled with adhesive (completely/partially/area).
  • the invention also relates to an I-arrangement axial flux motor having a rotor which is arranged coaxially with a stator which is designed in accordance with the stator according to the invention.
  • two stators can be provided, between which the rotor is located and which are designed in accordance with the stator according to the invention.
  • the invention relates in particular to indirect cooling of conductors by cooling the rear side of the stator.
  • Direct cooling of the conductors is also affected, with the coolant being conducted in the circumferential direction around the machine and individual winding slots or grouped winding slots, the coolant flowing alternately from radially outside to radially inside and, in the case of the adjacent winding slots, the coolant flowing from radially inside to radially outside.
  • goals for the axial flux machine such as supporting high power density and providing high efficiency, are achieved.
  • a high power density places particular demands on the cooling concept. This is now taken into account.
  • An outer distribution channel which encloses the outer winding heads, and an inner distribution channel, which encloses the inner winding heads, are formed.
  • These cavities can be formed, for example, by the winding grooves having a rectangular cross section, in which several round conductors are routed.
  • the seal to the rear of the stator (the side facing away from the air gap to the rotor) has openings/perforations that allow coolant to flow to the rear of the stator.
  • the stator has grooves on the back, which form a connection for the coolant radially to the outside.
  • the flow direction of the coolant is not determined by the choice of words above. A possible realization is described below.
  • typical of the I-arrangement is a central disk-like rotor, which has a right and a left stator (with a right and a left stator core), each on the side of the rotor.
  • Each stator has a winding with an outer and an inner end winding. Parts of the conductors of the windings run in the winding slots between the outer and inner end windings and generate an electromagnetic force on the rotor when current is applied.
  • the outer end winding is located in a volume for the outer end winding, which is bounded radially inward by the stator core, radially outward by the motor housing, to the rotor by a partition to the rotor and to the rear of the stator by an outer partition on the back.
  • the inner end winding is located in a volume for the inner end winding, which extends radially inwards through a seal to the shaft, radially outwards through the stator core, to the rotor through a partition wall to the rotor and to the rear of the stator through a bearing support wall (whereby this wall is not absolutely has to support the bearing, but is only executed in this way in this example) is bordered.
  • the bearing support wall has openings which connect the volume for the inner end winding to the back of the stator.
  • the rear wall of the stator has grooves for the coolant return, which connect the breakthroughs/openings in the bearing support wall with a "collecting channel return" located radially on the outside.
  • volume for the winding heads can also be arranged in the volume for the winding heads, for example, or can be arranged only at the separation points of the individual components or outside the volume for the winding heads.
  • the volume for the outer end winding, the clearances in the winding slots parallel to the conductors in the slots, the volume for the inner end winding, the coolant openings in the bearing support wall, the coolant return slots on the back of the stator, and the coolant return manifold form a connected volume through which the coolant can flow or, if necessary, is pumped.
  • the flow direction can be freely selected when designing the motor.
  • the coolant return collecting channel and the volume for the outer end winding are connected to the coolant supply by means of discharge and supply lines. The coolant derivation is not shown in the following figures.
  • the slots for the coolant return are offset in the circumferential direction relative to the winding slots, so that the removal of material for the slots for the coolant return does not impair the function of the magnetic flux line in the stator yoke, or only to a small extent.
  • This type of cooling can also be used, for example, in a half-array (with only one stator on one side of the rotor) in an axial flow machine.
  • the axial flux machine could also be designed with a single tooth winding instead of a wave winding (both have outer and inner end turns and conductors running in the winding slots).
  • the invention is explained in more detail below with the aid of a drawing. show:
  • stator 1 shows a stator in an exploded view, comprising a laminated stator core and a housing/flange,
  • Fig. 3 shows a front view of the stator from Fig. 2,
  • Fig. 4 is a partially illustrated longitudinal sectional view taken along the line
  • Fig. 5 is a bent longitudinal sectional view along the line V in the
  • FIGS. 1 to 3 shows an exploded view of an axial flux motor according to the invention with two identical stators in the manner of the stator in FIGS. 1 to 3,
  • Fig. 7 shows the state of the axial flux motor from Fig. 6 during assembly
  • Fig. 8 shows the state of the axial flux motor of Figs. 6 and 7 after assembly
  • Figures 9 and 10 are schematic representations of a wave wound axial flux motor
  • Figs. 11-13 provide a visualization of coolant flow through the axial flow motor of Figs. 9 to 10
  • the figures are only of a schematic nature and serve only to understand the invention. The same elements are provided with the same reference numbers. The features of the individual embodiments can be interchanged.
  • the stator 1 shows a first embodiment of a stator 1 according to the invention.
  • the stator 1 has a stator core 2 and a flange 3 .
  • the laminated core 2 of the stator has a rear side/yoke side 4 .
  • the flange has a front side 5 which faces the back side 4 of the laminated core 2 of the stator.
  • the laminated core of the stator On the other side of the rear side 4 of the laminated core of the stator, the laminated core of the stator has a pole side 6. This pole side 6 could also be referred to as the front of the laminated core of the stator.
  • a rotor 7 faces the pole side 6, as is shown, for example, in FIGS. 6 to 8 is shown.
  • a spacer ring 8 is also used here.
  • Two stators 1 on both sides of the rotor 7 with its spacer ring 8 decisively form the axial flux motor/the axial flux machine, which is provided with the reference number 9 .
  • grooves/indentations/recesses 10 which are distributed regularly over the circumference and lead from radially inward to radially outward in the radial direction, are pointed out.
  • Each groove 10 in turn has a channel 11 which is open in the direction of the flange 3 and leads to a stepped configuration of the groove 10 . This is shown particularly well in FIG.
  • an elevation / elevation / rib 12 of the flange 3 which follows the division of the grooves 10 in terms of angle and length, covers the channel 11 but does not fill it, but only closes it, but (preferably) with a positive fit the groove 10 engages and is dimensioned such that a stop 13 of the stator core, formed by a wall of the groove 10, is flush and thus form-fitting in contact with a counter-stop 14, formed by the elevation 12.
  • Channel 11 serves as an oil channel.
  • a stator tooth is indicated with reference number 15 . It extends in the direction of the pole side 6.
  • the flange 3 is present on the yoke side.
  • the stops 13 and counter-stops 14 act as axial stops or transmit torque when the stator core 2 rotates relative to the flange 3.
  • the radial direction is indicated by the arrow 16.
  • the axial direction is referenced by the arrow 17, see for example FIG.
  • FIG. 9 a flange 3 shaped into the housing next to the rotor 7, having at least two coolant supply lines 25.
  • a coolant flow in the winding groove parallel to the wires, e.g. B. in the free spaces between a round wire and a rectangular groove is visualized with the arrow 26, see in particular FIG.
  • a coolant flow at a stator rear wall is indicated by the reference number 27, in particular in FIGS. 11 and 12 referenced.
  • Winding grooves are referenced in FIG. 13 with reference numeral 28 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un stator (1) pour un moteur à flux axial (9) ayant un noyau de stator stratifié (2) qui est fixé à une bride (3), le noyau de stator stratifié (2) présentant un côté arrière (4) qui est fixé par emboîtement et par friction à un côté avant (5) de la bride (3), et/ou un canal de refroidissement (11) entre le noyau de stator stratifié (2) et la bride (3) étant formé dans la région de la fixation. L'invention concerne également un moteur à flux axial (9) comportant un rotor (7) agencé entre deux stators (1), l'un ou les deux étant conçu(s) selon l'invention.
EP21791250.0A 2020-10-07 2021-09-30 Stator pour moteur à flux axial ayant une liaison par emboîtement et par friction et un moteur à flux axial en agencement en i et refroidissement direct en ligne Pending EP4226477A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020126280 2020-10-07
DE102021108956.5A DE102021108956A1 (de) 2020-10-07 2021-04-10 Stator für Axialflussmotor mit Form- und Kraftschluss sowie Axialflussmotor in I-Anordnung und direkter Leiterkühlung
PCT/DE2021/100787 WO2022073549A1 (fr) 2020-10-07 2021-09-30 Stator pour moteur à flux axial ayant une liaison par emboîtement et par friction et un moteur à flux axial en agencement en i et refroidissement direct en ligne

Publications (1)

Publication Number Publication Date
EP4226477A1 true EP4226477A1 (fr) 2023-08-16

Family

ID=80738153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21791250.0A Pending EP4226477A1 (fr) 2020-10-07 2021-09-30 Stator pour moteur à flux axial ayant une liaison par emboîtement et par friction et un moteur à flux axial en agencement en i et refroidissement direct en ligne

Country Status (5)

Country Link
US (1) US20230369925A1 (fr)
EP (1) EP4226477A1 (fr)
CN (1) CN116349119A (fr)
DE (1) DE102021108956A1 (fr)
WO (1) WO2022073549A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022110665A1 (de) 2022-05-02 2023-11-02 Schaeffler Technologies AG & Co. KG Isolation für Gehäuse von Axialflussmaschinen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5668236A (en) * 1979-11-09 1981-06-08 Mitsubishi Electric Corp Disk type rotary machine
US6674214B1 (en) 1999-08-09 2004-01-06 Perm Motor Gmbh Electric axial flow machine
JP2010154610A (ja) * 2008-12-24 2010-07-08 Honda Motor Co Ltd アキシャルギャップ型モータ
GB0902390D0 (en) 2009-02-13 2009-04-01 Isis Innovation Electric machine - flux
CN205693458U (zh) * 2016-06-24 2016-11-16 江阴市海达电机冲片有限公司 一种新型定子冲片
FR3076674B1 (fr) 2018-01-09 2022-03-04 Whylot Sas Moteur ou generatrice electromagnetique a deux rotors et quatre stators et systeme de refroidissement integre
CN211127334U (zh) * 2019-12-31 2020-07-28 浙江盘毂动力科技有限公司 电机冷却系统、电机定子及盘式电机

Also Published As

Publication number Publication date
US20230369925A1 (en) 2023-11-16
DE102021108956A1 (de) 2022-04-07
WO2022073549A1 (fr) 2022-04-14
CN116349119A (zh) 2023-06-27

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