EP2156534A2 - Rotor à excitation permanente pour machines de travail - Google Patents

Rotor à excitation permanente pour machines de travail

Info

Publication number
EP2156534A2
EP2156534A2 EP08758798A EP08758798A EP2156534A2 EP 2156534 A2 EP2156534 A2 EP 2156534A2 EP 08758798 A EP08758798 A EP 08758798A EP 08758798 A EP08758798 A EP 08758798A EP 2156534 A2 EP2156534 A2 EP 2156534A2
Authority
EP
European Patent Office
Prior art keywords
rotor
machine according
work machine
permanent magnets
shaft
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.)
Withdrawn
Application number
EP08758798A
Other languages
German (de)
English (en)
Inventor
Jürgen Gröschel
Gerhard Huth
Sven Urschel
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.)
KSB AG
Original Assignee
KSB AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KSB AG filed Critical KSB AG
Publication of EP2156534A2 publication Critical patent/EP2156534A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material

Definitions

  • the invention relates to a working machine which is directly or indirectly connected to a motor, wherein a power transmission from the engine to the working machine with at least one driven by magnetic or electromagnetic fields rotor, in particular a rotor for driving turbomachines, wherein the rotor with over the Circumference distributed permanent magnets equipped and designed for operation in a chemically aggressive environment.
  • Such machines are often used in the chemical industry in the form of a flow machine, often a conveyor in the form of a pump; also with mixers and stirrers. There are equipped with permanent magnets rotors in magnetic clutches, hysteresis clutches or canned motors used.
  • rotors For a hermetic sealing of a working machine which is exposed to aggressive, dangerous or valuable liquids, such rotors are arranged within a containment shell or split tube filled with a conveying medium. This component, referred to below as a gap element, is used for the hermetic sealing between two spaces, firstly for the environment and secondly for a space filled with hazardous fluid and containing the rotor.
  • the stress criteria result from the corrosive, erosive, abrasive, cavitating and tribological factors and / or stresses.
  • a second element On such a rotor equipped with permanent magnets, a second element, usually an outer element, transmits drive energy. If the rotor is part of an electronically commutated motor, the second element would be a stator with a rotating field winding. Their rotating magnetic fields acting on the rotor equipped with permanent magnets such a drive sits a much higher system efficiency. As a result, the life cycle costs of a machine driven by such a rotor fall more favorably for a plant operator. And if the rotor is designed as part of a magnet or hysteresis clutch, a rotating outer rotor with its permanent magnets transmits its rotational movement to the rotor connected to the working machine. The magnetic forces cause the entrainment effect. In a hermetically sealed coupling, a sealing gap element is arranged between the rotor and the outer rotor.
  • Such rotors with circumferentially arranged permanent magnets consist of a rotor active part for the magnetic return of the permanent magnets and are connected for torque transmission to a shaft.
  • the rotor active part is encased in a corrosion-resistant metal shell to protect the surfaces of the permanent magnets from attack by the liquid and to absorb centrifugal forces occurring during operation.
  • Such a jacket additionally reduces the hydraulic resistance of the rotor rotating within a gap element in the liquid.
  • the torque of such a rotor is transmitted with the shaft to an element of a work machine, usually an impeller of a pump.
  • the shaft is made of a material resistant to the respective liquid. Due to its function, the rotor consists of a magnetically highly permeable, corrosion-resistant material. Therefore, in addition to the sheath, the end faces of the rotor active part and the transitions to the corrosion-resistant shaft must be sealed by additional means and protected against corrosion. This is done by additional mudguards or potting.
  • EP 1 719 916 A1 for pump units in the form of heating circulation pumps whose electric drive motors are designed as permanent magnet motors.
  • These known rotors are rotatably mounted with a rotor shaft in plain bearings in the stator housing or on the stator, wherein the actual rotor with the permanent magnets is fixed on the rotor shaft.
  • the individual permanent magnets are arranged in recesses of a laminated core, in whose central opening the rotor shaft is inserted.
  • the rotor is shaftless and completely formed of a magnetizable, ferritic material at least in a partial region of its axial extent and the magnetic poles of the rotor are produced by magnetization of the ferritic material .
  • a solution of a rotor made of compressed or sintered material can only be used in the case of the heating circulating pumps designed for a simple conveying medium and having small powers. Such a solution can not be used because of the ferritic material in the chemical field for reasons of lack of corrosion resistance.
  • the stainless steels necessarily used there are usually non-magnetizable austenites.
  • the object of the invention is to develop a structure for a liquid-flushed rotor that can be used in the chemical sector, whereby a high resistance to corrosive and / or aggressive fluid is given and a high degree of efficiency is ensured for a drive equipped with such a rotor ,
  • a rotor active part and associated shaft made of a corrosion-resistant stainless steel from the group of ferro-austenitic duplex steels with 40-60% ferrite and that protected in the outer periphery of such a rotor active part integrated permanent magnets from chemical attack are.
  • the formation of rotor active part and shaft made of a corrosion-resistant stainless steel from the group of ferritic-austenitic duplex steels eliminates the previously necessary protective measures in the area between the rotor active part and the transition to the shaft.
  • the shaft or shaft parts can be arranged in a manner known per se as separate parts.
  • the rotor as a one-piece rotor with integrally formed Shaped wave.
  • the rotor active part is composed of a plurality of rotor modules, wherein an axial length of a rotor module is defined by the dimensions of permanent magnets to be arranged therein.
  • the rotor modules are positively secured and / or by means of a shaft or by means of shaft parts to each other.
  • Each rotor module consists of a solid stainless steel block from the group of duplex steels. A use of modules in the form of packetized laminations, as known from EP 1 657 800 A1, is eliminated.
  • the rotor surface may in this case be formed by a thin-walled sleeve of a corrosion-resistant stainless steel from the group of ferritic-austenitic duplex steels. Such a sleeve is sealingly attached to a rotor active body or to a rotor active body composed of rotor modules. This can be done by laser welding or other known means.
  • the permanent magnets can be arranged directly within the surface of the rotor active body.
  • the permanent magnets are arranged just below the outer surface or the cylindrical outer peripheral surface within the rotor active body, in order to obtain protection against corrosion attacks on the endangered permanent magnets by the solid rotor surface.
  • Such insertion of the permanent magnets in the rotor, the rotor active body or in a plurality of solid rotor modules provides pockets which extend from a rotor end side in the axial direction close to the outer peripheral surface and receive the permanent magnets. Depending on the type and construction of such pockets, only the receiving openings of the pockets must be sealed after mounting on one or both rotor end faces.
  • DE 10 2005 041 352 A1 discloses a rotor in which permanent magnets are arranged in the tabs of a rotor core. As a result of the laminated structure, the liquid can pass through the gaps between the individual sheets to the permanent magnets and damage them.
  • the permanent magnets are sealed on each rotor module.
  • a rotor module made of duplex steel with an optimized axial length would be almost fully automatic on a CNC machine tool as a series product.
  • Embodiments of the invention provide that the arranged in pockets of the rotor active part permanent magnets are cup-shaped, rod-shaped, cuboidal or similar.
  • the inner coupling part is also a permanent magnet excited rotor, which is in principle identical in construction as the permanent-magnet pump motor.
  • a part coupling is possible in principle. Due to the modular design of the rotor, the advantage of t torque distribution for a product series of different drive powers.
  • Embodiments of the invention provide that the permanent magnets are shell-shaped, rod-shaped, cuboidal or similar.
  • the ferritic-austenitic duplex stainless steel with 40-60% ferrite is a material known, for example, from the material numbers: 1.4362, 1.4410, 1.4460, 1.4462, 1.4464, 1.4469, 1.4470,
  • Fig. 3 shows a working machine with indirect motor drive
  • Fig. 4 to 6 show different air locks
  • Fig. 1 shows a cross section through a working machine 1 in the form of a directly driven centrifugal pump.
  • This machine is designed to promote chemically aggressive fluids and designed here with a motor 2 in the form of a canned motor, wherein the permanent magnet 3 provided with rotor 4 is exposed directly to the chemical fluids.
  • the one-piece rotor 4 here consists of a rotor active part 5 and an associated directly molded shaft 6, these parts being made of a corrosion-resistant ferritic-austenitic duplex steel. It has proved to be advantageous to produce such a rotor 4 from a cast or forged preform and abariader processing to produce the dimensions of the rotor active part 5 and the molded shaft 6 and thus the rotor outer contour.
  • the rotor active part 5 has distributed over the circumference of several pockets 7, in each of which one or more permanent magnets 3 are arranged.
  • the permanent magnets 3 are protected within the pockets 7 against attacks by an aggressive fluid.
  • the pockets 7 are incorporated below the surface from the outer periphery in the rotor active part 5.
  • Fig. 2 shows another embodiment of the rotor 4 of Fig. 1, wherein within the one-piece rotor active part 5, two shaft parts 6.1 and 6.2 are attached to the storage thereof. All parts are made of corrosion-resistant ferritic-austenitic duplex steel.
  • FIG. 1 shows another embodiment of the pockets 7 for receiving the permanent magnets 3 . For reasons of better visibility, the permanent magnets 3 were not drawn in the upper pocket 7 in the section.
  • the tight connection of such a sleeve 8 with the rotor active part 5 is carried out by simple circulating welding, soldering -, adhesive, shrink or other sealing compounds.
  • the pockets 7 for receiving permanent magnets 3 are formed by an inner diameter of the sleeve 8 and by grooves which are incorporated into the surface of the Rotoeptmaschines 5.
  • the inner rotor 10 of the magnetic coupling 9 is a further variant of the rotor structure.
  • the here multi-part rotor active part 5 is composed of two or more rotor modules 5.1, 5.2, which are each made of a solid ferritic-austenitic duplex steel. This composite rotor active part 5 is torque-transmitting connected to a shaft portion 6.3 of the same material.
  • the shaft part 6 .3 is the rotor active part 5 rotatably supported within the magnetic coupling 9 or a correspondingly formed hysteresis coupling and at the same time connected to the work machine 1 in a force-transmitting manner.
  • the inner rotor 10 may also be constructed analogously to the rotor of FIG. 1 or 2.
  • the working machine can here - as shown - be a pump 1 or a stirrer, a mixer or other device.
  • the rotor modules 5.1, 5.2 are positively connected to each other and the joints sealed form-fitting and cohesive.
  • the rotor modules 5.1, 5.2 of the multi-part rotor active part 5 have below the rotor surface in the axial direction extending pockets 7, in which permanent magnets 3 are stored firmly and liquid-tight.
  • the storage of such permanent magnets 3 takes place by known means.
  • the sealing of the pockets 7 is carried out by separate means, thus precluding access of the chemical liquid to the permanent magnet 3.
  • the connection between the sealing center and the rotor active part 5 or the rotor modules 5.1, 5.2 must in this case be resistant to the respective chemical aggressive liquids. Welded joints have proven to be very beneficial.
  • FIGS. 4 to 6 three cross sections through rotors are shown as cutouts, in which the pockets 7 with permanent magnets 3 inserted therein and the use of flow locks 11 are shown.
  • the flow barriers 11 are shown as closed air barriers in the form of slots. The river barriers are here below the rotor surface.
  • FIG. 5 Another embodiment is shown in FIG. 5, in which the flow barriers 11 are installed as slotted open air barriers in the surface of the rotor active part 5.
  • Fig. 6 shows a form of round, drilled air locks 11.
  • This is another form of permanent magnet 7 application. These are cuboid and arranged side by side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne une machine de travail (1) qui est connectée, directement ou indirectement, avec un moteur (2), une transmission de force du moteur (2) à la machine de travail s'effectuant au moyen d'au moins un rotor (4) entraîné par des champs magnétiques ou électromagnétiques, en particulier un rotor pour l'entraînement de turbomachines, le rotor (4) étant équipé d'aimants permanents (3) et étant conçu pour un fonctionnement en milieu chimiquement agressif. Le rotor (4) et un arbre (6, 6.1, 6.2, 6.3) associé à celui-ci sont fabriqués d'une seule pièce en un acier inoxydable résistant à la corrosion, appartenant au groupe des acier duplex austéno-ferritique, et les aimants permanents (3) disposés sur le rotor sont protégés contres les attaques chimiques.
EP08758798A 2007-06-15 2008-05-28 Rotor à excitation permanente pour machines de travail Withdrawn EP2156534A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007028356A DE102007028356A1 (de) 2007-06-15 2007-06-15 Permanent erregter Rotor für Arbeitsmaschinen
PCT/EP2008/004213 WO2008151717A2 (fr) 2007-06-15 2008-05-28 Rotor à excitation permanente pour machines de travail

Publications (1)

Publication Number Publication Date
EP2156534A2 true EP2156534A2 (fr) 2010-02-24

Family

ID=39967828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08758798A Withdrawn EP2156534A2 (fr) 2007-06-15 2008-05-28 Rotor à excitation permanente pour machines de travail

Country Status (3)

Country Link
EP (1) EP2156534A2 (fr)
DE (1) DE102007028356A1 (fr)
WO (1) WO2008151717A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009042214A1 (de) 2008-10-22 2010-04-29 Ksb Aktiengesellschaft Rotor eines selbstanlaufenden Elektromotors
US20140054985A1 (en) 2011-02-24 2014-02-27 Andritz Ritz Gmbh Internally exicted synchronous motor comprising a permanent magnet rotor with multiple corrosion protection
WO2013151891A1 (fr) * 2012-04-03 2013-10-10 Russel Marvin Moteur à aimant permanent avec rotor à pôles à languettes
US9407115B2 (en) 2012-04-03 2016-08-02 Lcdrives Corp. Shaft attachment means for high efficiency permanent magnet machine with separated tab pole rotor
WO2013169810A2 (fr) * 2012-05-07 2013-11-14 Bobrick Washroom Equipment, Inc. Distributeur de fluide sans contact et méthode d'utilisation de celui-ci
DE102014013384A1 (de) * 2014-09-09 2016-03-10 Linde Aktiengesellschaft Polträger für einen elektro-mechanischen Energiewandler
DE102015226158A1 (de) * 2015-12-21 2017-06-22 Ksb Aktiengesellschaft Läufer für permanentmagneterregten Unterwasser-Pumpenmotor
DE102018221138A1 (de) * 2018-12-06 2020-06-10 Robert Bosch Gmbh Rotor für eine elektrische Antriebsmaschine zum Antrieb eines Verdichters, einer Turbine oder einer Laderwelle eines Abgasturboladers und Abgasturbolader mit einer elektrischen Antriebsmaschine und einem solchen Rotor
DE102018221134A1 (de) * 2018-12-06 2020-06-10 Robert Bosch Gmbh Rotor für eine elektrische Antriebsmaschine zum Antrieb eines Verdichters, einer Turbine oder einer Laderwelle eines Abgasturboladers, elektrische Antriebsmaschine mit einem solchen Rotor und Verfahren zur Herstellung eines derartigen Rotors
DE102022202909A1 (de) 2022-03-24 2023-09-28 Vitesco Technologies GmbH Elektromotor, Kraftstoffpumpe und Fahrzeug

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050121990A1 (en) * 2003-12-08 2005-06-09 Nissan Motor Co., Ltd. Rotor for rotary electric machine
JP2005287262A (ja) * 2004-03-31 2005-10-13 Honda Motor Co Ltd ロータおよびモータ

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633113A (en) * 1985-10-16 1986-12-30 Sundstrand Corporation Side plate construction for permanent magnet rotor
NZ268858A (en) * 1993-07-19 1998-01-26 Flux Pty Ltd Substituted Under Electromagnetic machine with permanent magnet rotor and toroidol stator
JP3414907B2 (ja) * 1995-11-16 2003-06-09 松下電器産業株式会社 モータ
JP3690616B2 (ja) * 1996-04-15 2005-08-31 日立金属株式会社 回転機
US5831364A (en) * 1997-01-22 1998-11-03 Ingersoll-Dresser Pump Company Encapsulated magnet carrier
DE19915664A1 (de) * 1999-04-07 2000-10-19 Siemens Ag Elektrische Maschine mit einem Stator
JP4598243B2 (ja) * 2000-06-23 2010-12-15 アスモ株式会社 回転磁界型電動機
JP3856661B2 (ja) * 2001-06-06 2006-12-13 株式会社荏原製作所 真空ポンプ
CH695973A5 (de) * 2002-08-16 2006-10-31 Alstom Technology Ltd Rotor für eine elektrische Maschine.
DE502004004596D1 (de) 2004-11-12 2007-09-20 Grundfos As Permanentmagnet-Rotor
EP1719916B1 (fr) 2005-05-07 2008-07-23 Grundfos Management A/S Groupe motopompe
DE102005041352A1 (de) 2005-08-31 2007-03-01 Siemens Ag Permanenterregte Synchronmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050121990A1 (en) * 2003-12-08 2005-06-09 Nissan Motor Co., Ltd. Rotor for rotary electric machine
JP2005287262A (ja) * 2004-03-31 2005-10-13 Honda Motor Co Ltd ロータおよびモータ

Also Published As

Publication number Publication date
WO2008151717A3 (fr) 2009-03-05
WO2008151717A2 (fr) 2008-12-18
DE102007028356A1 (de) 2008-12-18

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