WO2016005082A1 - Moteur électrique à refroidissement hydraulique comprenant un rotor à disque - Google Patents

Moteur électrique à refroidissement hydraulique comprenant un rotor à disque Download PDF

Info

Publication number
WO2016005082A1
WO2016005082A1 PCT/EP2015/060317 EP2015060317W WO2016005082A1 WO 2016005082 A1 WO2016005082 A1 WO 2016005082A1 EP 2015060317 W EP2015060317 W EP 2015060317W WO 2016005082 A1 WO2016005082 A1 WO 2016005082A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
housing
return flow
electrical machine
flow channels
Prior art date
Application number
PCT/EP2015/060317
Other languages
German (de)
English (en)
Inventor
Thomas Boeker
Daniel Kuehbacher
Henning Hanßen
Martin Fickert
Christian Prag
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2016005082A1 publication Critical patent/WO2016005082A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • 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
    • H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
    • H02K9/12—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing wherein the cooling medium circulates freely within the casing
    • 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
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • 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
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/18—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing

Definitions

  • the invention relates to electrical machines with disc rotors, in particular axial flux machines or transverse flux machines, which have a rotor disk as a rotor.
  • the present invention further relates to measures for cooling such electrical machines.
  • Electric machines with disc rotors are characterized by a high power density with a comparatively low weight.
  • WO 2009/1 15247 A1 discloses a transverse flux machine with a disk rotor.
  • permanent magnets are embedded at a constant distance from an axis of rotation, which are magnetized in the circumferential direction.
  • the disc rotor is arranged axially between two stator units, each concentrically extending around a motor axis
  • each of the stator units has circumferentially extending and projecting toward the disk rotor inner and outer stator teeth.
  • a force acts on the magnetic poles of the disk rotor in the direction of the magnetic pole of the stator units which is located closest to the circumference and has a magnetization opposite to the relevant magnetic pole. This can be one of the Position of the disc rotor as well as magnitude and sign of the stator current-dependent torque can be generated.
  • Stator magnetic field with the rotor magnetic field to a heating of the rotor disk and the stator units. To avoid damage to the electrical machine, it is therefore appropriate to provide measures for cooling.
  • stator windings to be designed as hollow conductors in order to cool them by means of a coolant flowing through them. Cooling is expensive, and it is therefore desirable to implement simpler, in particular passive cooling measures.
  • an electric machine with a pancake comprising:
  • At least one stator with protruding in the axial direction
  • a housing on which the at least one stator unit is arranged and which surrounds the at least one stator unit and the rotor disk, wherein in the housing a radially outer volume region and a radially inner volume region for receiving a medium, in particular air, separated by the at least one stator are trained; and - One or more separately formed from the gap return flow channels, which are adapted to allow a backflow of the medium from the radially outer volume region to the radially inner volume region.
  • One idea of the above electrical machine is to use the movement of the medium caused by a rotation of the rotor disk in the radial direction through the gap in order to produce a circulating flow of the medium, in particular an air flow, which at least partially through the Gap (air gap) runs.
  • the rotating rotor disk acts as a radial flow compressor and causes a media jam in one in the radially outer volume region, from which the medium can not escape to the outside as a rule. Therefore, in the case of the above electrical machine, a separate medium flow path is provided, which connects the radially outer volume area relative to the rotor disk to the radially inner volume area with respect to the rotor disk.
  • the medium may flow radially outward unhindered through the gap between the stator units and the rotor disk, thereby cooling both the stator units and the rotor disk.
  • the media jam described above can be avoided and a circulation of the medium can be achieved.
  • At least one of the return flow channels can be formed by a stator yoke of the at least one stator unit.
  • At least one of the return flow channels can be formed between an inner wall of the housing and a stator yoke of the at least one stator unit.
  • a stator yoke of the at least one stator unit can be arranged via a contact surface on a retaining ring, in particular integrally formed with the housing, wherein at least one of the return flow channels runs through the retaining ring or in the area of the contact surface through the retaining ring and through the stator yoke.
  • At least one of the return flow channels, a plurality of the return flow channels or all return flow channels may extend in a substantially radial direction between the outer volume region and the inner volume region.
  • At least one of the return flow channels can run in a gap of a double-walled housing or between a jacket and an outer wall of the housing.
  • At least one of the return flow channels is realized by a pipe connection outside the housing.
  • a cooling device for active cooling of the medium flowing through can be provided in the at least one return flow channel.
  • the at least one stator unit can be constructed from a plurality of stator segments, wherein at least one of the return flow channels is formed by one or in a segment gap between two stator segments which are adjacent to one another in the circumferential direction.
  • stator segments may be held on an end face of an annular support member disposed between stator segments and the housing
  • the plurality of stator segments may each have a plurality
  • Figure 1 is a cross-sectional view through an electric machine with a pancake and a remindstrompfad through the stator units; a perspective view through a section of an electric machine with a return passage in the stator yoke; a perspective view through a section of an electric machine with a return flow channel through a contact surface between the stator yoke and a retaining ring; a schematic cross-sectional view of an electric machine with a return path between an inner wall of the housing and the stator units; a schematic cross-sectional view of an electric machine with a pancake with an arranged outside the housing air path; a schematic cross-sectional view of an electrical machine with an arranged outside the housing air path in which a cooling device is arranged; a schematic cross-sectional view of an electrical machine with a built-up of stator segments stator; and Figures 8a and 8b perspective views through sections of electrical machines with different segment spaces between the stator segments.
  • Figure 1 shows a cross-sectional view through a rotary electric machine 1, which is designed as Axialpound- or transverse flux machine.
  • FIG. 2 shows a perspective view of a detail from the electrical machine 1 of FIG. 1.
  • the electric machine 1 has a housing 2, which has two annular stator units 3 opposite one another with respect to an axial direction, between which a disk-shaped rotor, a so-called disk rotor or disk rotor, is arranged in the form of a rotor disk 4.
  • the rotor disk 4 is provided with permanent magnets 41
  • the stator units 3 each have a substantially annular stator yoke
  • stator teeth 32 projecting from the stator teeth 32 in the axial direction.
  • stator teeth 32 are substantially equally spaced along the annular stator yoke 31.
  • One or more rectilinear or undulating stator windings are arranged on the stator teeth 32 in order to generate an alternating magnetic field in the direction of the rotor disk 4.
  • the Stator windings are in the stator teeth 32 by an electrically non-conductive material, such. As resin, shed.
  • Stator units 3 face each other in the axial direction, so that the rotor disk 4 moves past the projecting ends of the stator teeth 32 only by an air gap 7.
  • the housing 2 is formed substantially circular cylindrical and has along its center axis M a through hole through which a rotor shaft 5 extends.
  • the rotor shaft 5 is held rotatably on the housing 2 by bearings 6 arranged on the front side.
  • the housing 2 is self-contained and filled with a liquid or, preferably, gaseous medium, e.g. Filled with air.
  • a liquid or, preferably, gaseous medium e.g. Filled with air.
  • the rotor disk 4 is arranged on the rotor shaft 5 and projects from it substantially in the vertical direction.
  • the rotor disk 4 is arranged such that it is rotatably arranged between the two mutually facing ends of the stator units 3 and is spaced therefrom by the air gap 7.
  • the stator windings which run between stator teeth 32 are potted so that an air chamber as outer volume region 8 forms between housing 2 and stator arrangement 3 in the radially outer region, which is connected to a radially inner volume region 9 only via air gap 7 .
  • air is transported from the radially inner volume region 9 in the direction of the radially outer volume region 8 due to centrifugal forces.
  • the air gap 7 is the only connection between the radially outer and the radially inner volume region 8, 9, so that the air accumulates in the radially outer volume region 8. As a result, convection or a further flow through the air through the air gap 7 is prevented.
  • stator yoke 31 does not extend as far as the housing 2 in the axial direction, then the stator yoke 31 can be held by a retaining ring 21 protruding inwardly in the axial direction from the housing 2, as shown in FIG.
  • the retaining ring 21 may in particular be formed integrally with the housing 2 or provided as a separate component.
  • the stator yoke 31 is formed so as to abut on the retaining ring 18.
  • the return flow channels 10 can then run in the stator yoke 31 and / or in the retaining ring 18 and / or at the contact surface between the stator yoke 31 and the retaining ring 18.
  • the return flow channels 10 may also extend between the stator yoke 31 and an inner wall of the housing 2.
  • the stator yoke 31 can be held between the individual return flow channels 10 by individual webs (not shown) running in the radial direction.
  • the one or more return passages 10 are disposed outside of the housing 2 and extend along an outer wall of the housing 2.
  • the return passages 10 may be easily formed by a double-walled housing 2 having a gap 12. Through one or more first openings 14 between the radially outer volume region 8 and the intermediate space 12 and through one or more second openings 15 between the radially inner volume region 9 and the intermediate space 12, one or more return flow channels 10 may be formed.
  • the housing 2 may also be surrounded by a casing 13, wherein in the housing 2 in each case in the region of the radially outer volume region 8, a first opening 14 and in the region of the radially inner volume region 9, a second opening 15 is provided, so that in the radially outward volume area 8 conveyed air between the casing 13 and an outer side of the housing 2 in the direction of the second opening 15 in the radially inner volume region 9 to flow and thereby can circulate.
  • cooling ribs 16 may be provided for enlarging the surface of the outside of the housing 2 or the casing 13.
  • the cooling fins 16 By the cooling fins 16, the heat dissipation on the outside of the double-walled housing 2 and the outside of the sheath 13 flowing air is improved.
  • the radially outer volume region 8 and the radially inner volume region 9 are connected to one another via one or more pipe connections 17 as return flow channels.
  • the pipe connections 17 extend outside the housing 2 from the one or more first openings 14 to the one or more second openings 15.
  • the pipe connections 17 may be coupled to a cooling device 19 connected to the
  • Example using active cooling, the temperature of the air flowing through the pipe joints 17 air decreases.
  • structures 1 1 protruding into the air flow may be provided in the interior of the one or more return flow channels 10. These are exemplified in FIGS. 4, 5 and 6.
  • the structures 1 1 serve on the one hand to increase the heat-emitting surface in the return flow channel 10, and on the other to cause turbulence of the air flowing through the return flow channel 10, whereby the heat dissipation is further improved.
  • the return flow channels 10 are provided by grooves or interruptions between individual ones
  • Stator segments 21 are provided. Since the dimensions of stator units 3 for a one-piece design are often too large, they can
  • Stator segments 21 are formed.
  • the stator segments 21 become a ner annular stator 3 assembled and held in a suitable manner.
  • stator segments 21 may be formed with dimensions, so that the stator segments 21 each have at a distance from each other (the segment interspaces 22), which may serve as a return flow channel 10. Due to the distance, the stator yoke 31 is not formed continuously. So that no magnetic path is formed over the distance between adjacent stator segments 21, it is expedient that each stator segment 21 carries a number of stator teeth 32. Essentially, it is provided that each phase is assigned an identical number of stator teeth (32) in order to compensate for the magnetic fields introduced in the stator yoke of the relevant stator segment 21 via the stator windings. As a result, the segment interspaces 22 behave magnetically substantially neutral.
  • the segment interspaces 22 are formed by contours of the stator segments 21 provided in the circumferential direction and may have a wedge-shaped or rectangular cross-section. So that the stator segments 21 remain arranged in their ring shape, they can be arranged on a support plate 23, for. B. by gluing or the like, wherein the support plate 23 is disposed between the housing 2 and the stator 22.
  • the housing 2 may further be provided in the region in which the support plate 23 rests with a cooling channel 25 through which the support plate 23 and the stator segments 21 arranged thereon are cooled.

Landscapes

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

Abstract

L'invention concerne un moteur électrique (1) comprenant un rotor à disque. Ledit moteur comprend : - un disque de rotor (4) réalisé sous la forme d'un rotor à disque ; - au moins une unité stator (3) présentant des dents (32) faisant saillie dans la direction axiale, le disque de rotor (4) étant monté mobile en rotation à une certaine distance d'une fente (7) et au-dessus de cette dernière aux extrémités en saillie desdites dents ; - un carter (2), sur lequel l'unité ou les unités stator (3) sont disposées et qui entoure l'unité stator (3) et le disque de rotor (4), une zone de volume radialement extérieure (8) et une zone de volume radialement intérieure (9), destinées à loger un milieu, en particulier de l'air, et séparées par l'unité ou les unités de stator (3), étant formées dans le carter (2) ; et - un ou plusieurs canaux de refoulement (10) formés séparément de la fente (7) et conçus pour admettre un reflux du milieu de la zone de volume radialement extérieure (8) à la zone de volume radialement intérieure (9).
PCT/EP2015/060317 2014-07-10 2015-05-11 Moteur électrique à refroidissement hydraulique comprenant un rotor à disque WO2016005082A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014213452.8 2014-07-10
DE102014213452.8A DE102014213452A1 (de) 2014-07-10 2014-07-10 Strömungsgekühlte elektrische Maschine mit einem Scheibenläufer

Publications (1)

Publication Number Publication Date
WO2016005082A1 true WO2016005082A1 (fr) 2016-01-14

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ID=53175502

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Application Number Title Priority Date Filing Date
PCT/EP2015/060317 WO2016005082A1 (fr) 2014-07-10 2015-05-11 Moteur électrique à refroidissement hydraulique comprenant un rotor à disque

Country Status (2)

Country Link
DE (1) DE102014213452A1 (fr)
WO (1) WO2016005082A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024027989A1 (fr) * 2022-08-04 2024-02-08 Robert Bosch Gmbh Machine électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020132490B4 (de) 2020-12-07 2022-12-01 Schaeffler Technologies AG & Co. KG Elektrische Axialflussmaschine und Achse mit elektrischem Antrieb
DE102021122967A1 (de) 2021-09-06 2023-03-09 Schaeffler Technologies AG & Co. KG Axialflussmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745272U (fr) * 1980-08-27 1982-03-12
DE102009055273A1 (de) * 2009-12-23 2011-06-30 Robert Bosch GmbH, 70469 Elektromaschine
GB2485184A (en) * 2010-11-04 2012-05-09 Evo Electric Ltd Internal cooling of axial flux electrical machines
WO2014056717A2 (fr) * 2012-10-09 2014-04-17 Robert Bosch Gmbh Refroidissement d'espaces frontaux d'une machine électrique fermée

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT2255431E (pt) 2008-03-15 2012-08-20 Rainer Marquardt Motor de acionamento direto com baixa inércia e superior densidade energética

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745272U (fr) * 1980-08-27 1982-03-12
DE102009055273A1 (de) * 2009-12-23 2011-06-30 Robert Bosch GmbH, 70469 Elektromaschine
GB2485184A (en) * 2010-11-04 2012-05-09 Evo Electric Ltd Internal cooling of axial flux electrical machines
WO2014056717A2 (fr) * 2012-10-09 2014-04-17 Robert Bosch Gmbh Refroidissement d'espaces frontaux d'une machine électrique fermée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024027989A1 (fr) * 2022-08-04 2024-02-08 Robert Bosch Gmbh Machine électrique

Also Published As

Publication number Publication date
DE102014213452A1 (de) 2016-01-14

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