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WO2017194352A1 - Machine électrique pourvue d'un agencement à deux rotors - Google Patents

Machine électrique pourvue d'un agencement à deux rotors Download PDF

Info

Publication number
WO2017194352A1
WO2017194352A1 PCT/EP2017/060404 EP2017060404W WO2017194352A1 WO 2017194352 A1 WO2017194352 A1 WO 2017194352A1 EP 2017060404 W EP2017060404 W EP 2017060404W WO 2017194352 A1 WO2017194352 A1 WO 2017194352A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
stator
electrical machine
permanent magnets
inner rotor
Prior art date
Application number
PCT/EP2017/060404
Other languages
German (de)
English (en)
Inventor
Mykhaylo Filipenko
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2017194352A1 publication Critical patent/WO2017194352A1/fr

Links

Classifications

    • 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
    • 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
    • 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
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos

Definitions

  • the invention relates to an electric machine with a double-rotor arrangement, in particular a machine having an inner rotor and an outer rotor, between which a stator is arranged.
  • a power density can be used, wel ⁇ Che sets the achievable by the machine power in relation to their weight and is usually given in kW / kg. While up to 2 kW / kg are sufficient for many industrial applications, power densities in orders of magnitude, Need Beer ⁇ you Untitled eg. For the electrification of aviation electrical machines with power densities of at least 20 kW / kg.
  • the power density of an electrical machine scales directly with the magnetic flux density, which can be generated by the electric or permanent magnets used in the electric machine and which can be used with the example of the
  • Stator of the machine arranged coils interacts electromagnetically.
  • This relationship between the flux density and the power density allows a significant increase in the power density of the machine in that a Doppel ⁇ runner configuration is used, in which the stator or arranged on the stator coils between two magnetic flux density-causing magnets equipped runners is arranged.
  • the stator is arranged in the radial direction between an external rotor and an internal rotor.
  • Such double-armature configurations are electromagnetically advantageous, since they allow both very high magnetic flux densities in the air gaps and best map the magnetic circuit, since the runners on both sides of the stator for the generation and for the guidance of the magnetic flux. can be used. These and other measures can be reflected in increased power density.
  • ⁇ in the radially outer outer rotor has a bell shape and this surrounds the inner rotor and the stator.
  • the bell shape is open at one end as viewed in the axial direction and closed at one end, wherein the bell or the rotor at the closed end with a shaft of the electric machine is connected such that a torque from the rotor to the shaft or vice versa can be transmitted ,
  • the main disadvantage of this construction is that high bending moments occur on ⁇ due to the magnetic attraction forces in the radial direction, the effect, in particular, at the open end of the bell and the intercepted by a relatively heavy mechanical design of the rotor ⁇ the need.
  • the above-mentioned advantages of the electromagnetic ⁇ tica design can be partially overcompensated by these mechanical disadvantages. It is therefore an object of the present invention to provide an alternative way to increase the power weight of an electric machine.
  • An electrical machine has an inner ⁇ runner and an outer rotor which together form a double-pelmati für , and a stator.
  • the inner rotor and the outer rotor are arranged concentrically with each other such that the inner rotor is located radially inside the outer rotor.
  • the stator is in the radial direction disposed between the inner rotor and the outer rotor and concentric with the inner rotor and the outer rotor.
  • the external rotor is rotatably mounted on the stator with the aid of a pair of roller bearings, wherein the two roller bearings of the pair are arranged in the axial direction spaced from each other.
  • the inner rotor with the aid of another pair of rolling bearings can be rotatably mounted on the stator, wherein the two rolling bearings of the other pair of rolling bearings are also arranged spaced apart in the axial direction.
  • stator rotatably mounted on the stator means that the per ⁇ stays awhile rotor is rotatable relative to the stator and that the respective pair of roller bearings on the respective rotor
  • Stator supports so that represents the respective pair of bearings a rotary connection between the respective rotor and the stator.
  • the advantage of this configuration with rolling bearings is that the structure of the double-rotor arrangement can be easier, since the structure does not have to bear a one-sided, strong bending moment.
  • the advantage therefore lies in the complete elimination of the external bending moments, which lead to a streamlining of the mechanical structure of the double-rotor arrangement and thus of the electrical machine as a whole.
  • the double-rotor arrangement can exploit its electromagnetic advantages without being disadvantaged by the mechanical design.
  • the term of the rolling bearing is to be noted that these are bearings, with which a first component mounted ⁇ example, for example, an inner ring, and a second component mounted ⁇ component, for example, an outer ring are rotatable or rotatable relative to each other.
  • Well-known subgroups of the rolling bearings are, for example, ball bearings or roller bearings, whereby combined designs are also possible, as described, for example, in DE102006044802A1.
  • inner ring and outer ring are lubically arranged with a lying in the radial direction between the inner ring and outer ring annular gap.
  • the rolling elements may, for example, be formed as balls or rollers or rollers.
  • the structure and operation of such rolling bearings are well known, are therefore not further explained.
  • a corresponding arrangement results in a Axi ⁇ alumblelzlager, wherein the first and the second component in the axial direction are arranged one behind the other. Both components are annular with substantially the same radii.
  • the rolling elements are also here in one
  • Gap which is located in the axial direction between the two components.
  • the runners i. the inner rotor and the outer rotor each have a plurality of permanent magnets for generating a magnetic flux.
  • the permanent magnets of the inner rotor and the outer rotor are designed and arranged such that a torque between the inner rotor and the outer rotor alone and in particular without the use of the below-mentioned mechanical connection between the runners, but only due to magnetic forces between the inner rotor and the outer rotor arranged permanent magnet is transmitted. Also, this arrangement without the mechanical connection leads to a further weight saving.
  • the two runners can be largely independently treated, which is particularly in the event that the permanent magnets of the inner rotor and the outer rotor depending ⁇ Weil superconducting, is advantageous. In this case, Kings ⁇ NEN necessary to cool the magnet cryostats be performed inde pendent ⁇ or separated. Also, the magnetization of the superconducting magnets necessary before the operation of the electric machine would be simplified.
  • the permanent magnets can be formed as superconducting permanent magnets, whereby significantly higher flux densities are possible, which has a positive effect on the power density
  • the inner rotor and / or the outer rotor are mechanically connected to a shaft of the electric machine, so that a torque can be transmitted between the respective rotor and the shaft.
  • the inner rotor can be connected to the external rotor via a mechanical connection to Drehmomentübertra ⁇ supply to guarantee in a simple way that the full torque between double rotor structure and Wave is transmitted.
  • the mechanical connection between inner and outer rotor is useful to ensure an effective torque transmission.
  • this is relatively easy, since only torques must be transmitted in the circumferential direction, while bending loads, etc. are intercepted by the rolling bearing assembly.
  • the inner rotor and / or the outer rotor can each have a yoke, for example an iron yoke, for guiding the magnetic flux generated by the permanent magnets.
  • a yoke for example an iron yoke
  • the permanent magnets of the inner rotor and / or the outer rotor are each formed as a Halbach arrangement, however, can be dispensed with the use of the iron yokes, since the magnetic flux does not have to be guided over yokes.
  • Halbach arrangements are known, for example, from DE102013225093A1. This also results in a more rowsre ⁇ duzmaschine. Further advantages and embodiments will become apparent from the drawings and the corresponding description.
  • FIG. 1 shows a lateral sectional view of a side view
  • FIG. 2 shows a side sectional view of an electric machine with double rotor arrangement according to the invention
  • FIG. 3 shows a lateral sectional view of an electric machine according to the invention with double rotor arrangement in a first expanded embodiment
  • 4 shows a side sectional view of an electric machine according to the invention with double rotor arrangement in a second expanded embodiment.
  • Like reference numerals in different figures indicate like components. It is also noted that terms such as Be ⁇ "axial” and “radial” refer to the coming wave in each beschrie ⁇ surrounded example, or in the respective figure is used. In other words, the directions refer axially and radially always to a rotational axis of the Läu ⁇ fers.
  • the machine 100 has a rotor 110 in the form of a double-rotor arrangement with an inner rotor 111 and an outer rotor 112, the inner rotor 111 having a smaller diameter than the outer rotor 112.
  • the rotors 111, 112 of the double-rotor arrangement 110 are arranged concentrically to one another, such that the inner rotor 111 is located radially inside the outer rotor 112. In the axial direction, the runners 111, 112 are located substantially at the same position.
  • Both the inner rotor 111 and the outer rotor 112 permanent magnets 113, 114 are mounted, which generate magnetic fields or magnetic fluxes.
  • the runners 111, 112 and attached to the runners 111, 112, magnets 113, 114 are dimensioned such that a respective magnet 113 is located on ⁇ In neninr 111 and a magnet 114 at the external rotor in the radial direction with respect to.
  • the magnetic flux extends over the air gap between such a pair of magnets consisting of radially opposite magnets on the inner rotor 111 and the outer rotor 112 and closes on the example.
  • Eisenjoche 115, 116 formed inner and outer rotor 111, 112th
  • the machine 100 has a stator 120.
  • the stator 120 is concentric with the inner rotor 111 andorderläu- fer 112 and further arranged in the radial direction between the inner rotor 111 and the outer rotor 112, so located in the above-mentioned air gap between the inner rotor 111 and outer rotor 112.
  • the stator 120 carries a plurality of windings or coils 121 which are wound on cores 122 may be and are arranged such that they are penetrated by the magnetic flux generated by the permanent magnets 113, 114.
  • the stator 120 may have a mechanical ⁇ African connection 123, for example.
  • Oa a screw to be firmly connected to a housing or other components of the electric machine 100 (not shown in detail), so that the stator 120 relative to the engine 100 in itself or .
  • the housing With respect to the housing is ultimately immobile and essentially only the rotor 110 together with a shaft 130 can perform ne movement.
  • the rotor 110 or the double-rotor arrangement 110 rotates relative to the stator 120.
  • Rotor 110 and stator 120 are arranged relative to one another such that the magnetic field of the permanent magnets 113, 114 and the coils 121 interact with one another in such a way that that the electrical machine 100 operates as a generator and / or in a second operating mode as an electric motor due to the interaction ⁇ effect in a first operating mode.
  • the operation of the electrical machine 100 is thus based on the known concept that the two components 110, 120 interact electromagnetically with each other, so that the electric machine 100 can operate in one of the two operating modes.
  • the double rotor arrangement 110 and with it the permanent magnets 113, 114 are, for example, set in rotation via the shaft 130 of the electrical machine 100, so that electrical voltages are induced in the coils 121 of the stator 120 . If the electric machine 100 is to operate as an electric motor, the coils 121 are supplied with electric current, so that due to the interaction of the magnetic field generated therewith. net fields with the fields of the permanent magnets 113, 114 a torque on the rotor 110 and thus acts on the shaft 130. In principle, it is also conceivable, but not shown, that the permanent magnets 113, 114 is not ⁇ arranged on the rotor 110 are, but on the stator 120.
  • the coils 121 are induced in the according to the operating voltages and are supplied with a current are arranged in this case on the runner 110 and can be connected, for example via brushes or other suitable transformer with an electrical load or with a power source (not shown).
  • This embodiment is, however, explained in the following non nä ⁇ ago, it does not WE sentliche role for the actual invention to which the two components 110, 120, the permanent magnets 113, 114 and the coils 121 are arranged respectively.
  • the external rotor 112 of the known double-rotor arrangement 110 is realized as a bell-type rotor.
  • a bell runner 112 has a bell shape which surrounds the inner rotor 111 and the stator 120. As seen in the axial direction, the bell shape is open at one end 117 and completely or partially closed at the other end 118, wherein the bell 112 and the outer rotor 112 are connected at the closed end to the inner rotor 111 and in particular to the shaft 130 of the electric machine 100 is that a torque from the double-rotor assembly 110 on the shaft 130 or vice versa can be transmitted.
  • FIG 2 shows an inventive electrical machine 100, in which the external rotor 112 has no bell shape.
  • the operation of the machine 100 illustrated in FIG 2 as well as in the further Fi ⁇ guren corresponds to that known from the prior art machine, however, the external rotor 112 by means of two roller bearings 141 rotatably mounted on the stator 120 142, so the roller bearing 141, 142 ei ⁇ ne rotary connection to the stator 120 represent.
  • the two rolling Bearings 141, 142 are in the axial direction of each other
  • a further pair of roller bearings 143, 144 may be provided between the inner rotor 111 and the stator 120, which produces a rotational connection between the inner rotor 111 and the stator 120. This is likewise shown in FIG.
  • the rolling bearing 143, 144 of the other pair are also arranged spaced apart in the axial direction, so that here in particular ⁇ special acting in the radial direction bending moments can be intercepted.
  • At least one of the rotors 111, 112, for example, the inner rotor 111, must be mechanically connected to the shaft 130 in order to allow a torque transmission between the double rotor assembly 110 and shaft 130.
  • FIG. 3 shows a further development of the electric machine 100, in which, moreover, the inner rotor 111 is connected to the outer rotor 112 via a mechanical connection 119 for transmitting torque, so that the torques generated on both rotors 111, 112 subsequently act on the Wave 130 are transferable.
  • 3 embodiments of the runners 111, 112 each have an iron yoke 115, 116 for guiding the on by the permanent magnets 113, 114 magnetic flux generated ⁇ tables.
  • the 4 shows in the direction indicated in FIG 2 with "IV" view an alternative arrangement wherein the greatest extent on the use of flux conducting materials can be dispensed starting, so that the runners 111, 112 we ⁇ considerably lighter, more that is lighter in weight
  • the permanent magnets 113, 114 are each configured as so-called Halbach arrays Such a rotor with Halbach arrangements is, for example, in
  • an advantage of the Halbach array is based on the fact that the genetic like ⁇ flux density in the air gap, the radially between the stator 120 and the respective rotor 111, is 112, extends mainly.
  • a Halbach arrangement may be formed by means of a plurality of permanent magnets, so that by a special arrangement of the individual permanent magnets, the magnetic flux density in the radially inward direction, ie within the respective rotor 111, 112, attenuated while in the associated air gap , that is, outside the respective rotor 111, 112 in the area between the respective rotor 111, 112 and the stator 120, itself amplified and / or concentrated.
  • the coils 121 of the stator 120 are preferably designed as so-called. Air coils, ie in particular without weichmagneti ⁇ 's core. Instead, the coils 121 may, for example, be wound on nonmagnetic cores 122 of a preferably light material or even completely without a core. This has the consequence that also the stator 120, can inter alia be made such that it has a comparatively low weight ⁇ .
  • the rolling bearings 141, 142, 143, 144 may be formed, for example, as a ball bearing. Also suitable are, for example, embodiments as roller or roller bearings.
  • the coils 121 can be induced into the voltages depending on the operation or to be supplied with a current , are connected via the bearings with an electrical load or with a power source (not shown). On brushes or similar compo- Accordingly, it is possible to dispense with the transmission of the electric current from or onto the coils 121 rotating in this case. It should be noted that the aspects and features of the electric machine explained with reference to the various figures can be combined with one another as far as possible.
  • the weight of the overall arrangement advantageous embodiment results from the combination of the embodiment with Halbach arrays on the rotor 110 with the embodiment with Lucasspu ⁇ len 121 on the stator 120, because in this case due to the white ⁇ testgoing abandonment of relatively heavy components an electric machine with low weight can be realized.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

Machine électrique pourvue d'un agencement à deux rotors La présente invention concerne une machine électrique pourvue d'un agencement radial à deux rotors comprenant un rotor interne et un rotor externe entre lesquels est disposé un stator. Des aimants permanents sont placés au niveau des rotors tandis que le stator porte une pluralité de bobines qui, en cas de rotation en sens opposé du rotor et du stator, ont une interaction électromagnétique avec les aimants permanents. Le rotor externe et, le cas échéant également, le rotor interne sont logés rotatifs au niveau du stator à l'aide de paires respectives de roulements à billes de sorte que des couples de flexion apparaissant éventuellement sont absorbés par les paliers à roulement. Par conséquent, les rotors, en particulier le rotor externe, peuvent être exécutés moins robustes et ainsi plus légers.
PCT/EP2017/060404 2016-05-13 2017-05-02 Machine électrique pourvue d'un agencement à deux rotors WO2017194352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016208259.0A DE102016208259A1 (de) 2016-05-13 2016-05-13 Elektrische Maschine mit Doppelläuferanordnung
DE102016208259.0 2016-05-13

Publications (1)

Publication Number Publication Date
WO2017194352A1 true WO2017194352A1 (fr) 2017-11-16

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PCT/EP2017/060404 WO2017194352A1 (fr) 2016-05-13 2017-05-02 Machine électrique pourvue d'un agencement à deux rotors

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DE (1) DE102016208259A1 (fr)
WO (1) WO2017194352A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020173526A1 (fr) * 2019-02-28 2020-09-03 Hartmut Michel Machine à courant continu
US10910903B2 (en) 2018-01-12 2021-02-02 Carrier Corporation Dual rotor, coreless, electromagnetic machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018212764A1 (de) * 2018-07-31 2020-02-06 Siemens Aktiengesellschaft Supraleitender Magnet, Verfahren zu dessen Herstellung, elektrische Maschine und hybridelektrisches Luftfahrzeug
US11831210B2 (en) * 2021-04-19 2023-11-28 Mirko Dusan Vojnovic Non-cogging high efficiency electric generator
WO2024051949A1 (fr) * 2022-09-08 2024-03-14 Volvo Penta Corporation Moteur électrique pour propulsion navale

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US6624545B1 (en) * 1999-10-04 2003-09-23 Nissan Motor Co., Ltd. Electric rotating machine and manufacturing method thereof
DE102006044802A1 (de) 2006-09-22 2008-03-27 Schaeffler Kg Kombiniertes Rollen-Kugellager
DE102013225093A1 (de) 2013-12-06 2015-06-11 Siemens Aktiengesellschaft Rotor für eine elektrische Maschine

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WO2005089327A2 (fr) * 2004-03-14 2005-09-29 Revolution Electric Motor Company, Inc. Moteur-generateur a haut rendement et a faible cout
JP2006288023A (ja) * 2005-03-31 2006-10-19 Hokuto Giken:Kk コアレスブラシレス直流電動機

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US6624545B1 (en) * 1999-10-04 2003-09-23 Nissan Motor Co., Ltd. Electric rotating machine and manufacturing method thereof
DE102006044802A1 (de) 2006-09-22 2008-03-27 Schaeffler Kg Kombiniertes Rollen-Kugellager
DE102013225093A1 (de) 2013-12-06 2015-06-11 Siemens Aktiengesellschaft Rotor für eine elektrische Maschine
WO2015082528A2 (fr) * 2013-12-06 2015-06-11 Siemens Aktiengesellschaft Rotor pour machine électrique

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ANONYMOUS: "Electric machine - Wikipedia", 4 May 2016 (2016-05-04), XP055386835, Retrieved from the Internet <URL:https://en.wikipedia.org/w/index.php?title=Electric_machine&oldid=718541750> [retrieved on 20170630] *
BIOAGE MEDIA: "Green Car Congress: Airbus Group and Siemens sign long-term agreement to develop hybrid-electric propulsion systems for aircraft", 7 April 2016 (2016-04-07), XP055385189, Retrieved from the Internet <URL:http://www.greencarcongress.com/2016/04/20160407-aircraft.html> [retrieved on 20170626] *
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10910903B2 (en) 2018-01-12 2021-02-02 Carrier Corporation Dual rotor, coreless, electromagnetic machine
WO2020173526A1 (fr) * 2019-02-28 2020-09-03 Hartmut Michel Machine à courant continu

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