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EP1678806A1 - Rotor a aimant permanent d'une machine electrique a haute resistance thermique - Google Patents

Rotor a aimant permanent d'une machine electrique a haute resistance thermique

Info

Publication number
EP1678806A1
EP1678806A1 EP04762671A EP04762671A EP1678806A1 EP 1678806 A1 EP1678806 A1 EP 1678806A1 EP 04762671 A EP04762671 A EP 04762671A EP 04762671 A EP04762671 A EP 04762671A EP 1678806 A1 EP1678806 A1 EP 1678806A1
Authority
EP
European Patent Office
Prior art keywords
rotor
electrical machine
magnetic element
machine according
cover
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Withdrawn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
EP04762671A
Other languages
German (de)
English (en)
Inventor
Susanne Evans
Wolf-Joachim Eggers
Helmut Aesche
Juergen Herp
Markus Heidrich
Steven-Andrew Evans
Tilo Koenig
Markus Peters
Joachim Van Wijhe
Lin Feuerrohr
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.)
Robert Bosch GmbH
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 EP1678806A1 publication Critical patent/EP1678806A1/fr
Withdrawn legal-status Critical Current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
    • H02K1/22—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
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

  • the present invention relates to a rotor for an electrical machine and in particular to a rotor for an EC motor with improved temperature resistance, which is constructed in particular with NdFeB magnets, and to an electrical machine with such a rotor.
  • Electrical machines are known, for example, as electric motors in which a ring magnet is attached to the rotor. This results in the need for manufacturing technology to attach the ring magnet to the rotor shaft. Usually an adhesive is used for fastening.
  • the hollow cylindrical ring magnets are also often used on the
  • Rotor shaft attached cylindrical carrier bodies (often for a magnetic yoke made of steel) connected by applying adhesive in the gap between the ring magnet and the carrier body. In operation, however, it happens due to the different
  • Another disadvantage of the adhesive process is that the adhesive is brought into the gap between the carrier body and the ring magnets. In this case, the gap must have a pre-formed thickness in order to be able to carry out the gluing process at all in terms of production technology.
  • the greater the distance between the ring magnet and the carrier body the higher the magnetic losses.
  • a complete temperature compensation can be carried out between the parts made of different materials.
  • the magnetic losses are minimized by a minimized gap between the magnetic element and a component arranged inside the magnetic element. This is achieved according to the invention in that the magnetic element is fastened to at least one end lying in the axial direction by means of an elastic cover disk.
  • no adhesive has to be provided on the inner cladding area of the magnetic element, so that the gap to an adjacent component can be selected to be significantly smaller.
  • the other end of the hollow cylindrical magnetic element lying in the axial direction is preferably in contact with a shaft shoulder of the rotor shaft.
  • the magnetic element is fastened at its two ends lying in the axial direction by means of elastic cover disks. This enables a symmetrical rotor arrangement to be obtained which has particularly good temperature compensation properties due to two cover disks arranged at the ends of the magnetic element.
  • the magnetic element is preferably attached to the cover disks by means of an adhesive. This significantly simplifies and improves the processing and positioning of the adhesive compared to the prior art. Furthermore, the positioning of the connection between the magnetic element and the rotor shaft at the axial ends of the magnetic element enables adhesives with both high and low viscosities to be used.
  • the cover disks preferably each have at least one radially extending slot.
  • the slot particularly preferably runs inwards from the outer circumference of the cover disk.
  • a plurality of radially extending slots, which can have different lengths, are preferably provided in the cover disks.
  • the cover disks preferably have slots with a first length and slots with a second length, the first length being greater than the second length.
  • the cover disks are preferably designed symmetrically.
  • the cover disks preferably have a resilient area.
  • the resilient area can be provided, for example, by a bead that runs completely around the circumference.
  • an excellent compensation function can be provided by the cover plates.
  • At least one slot should have a length that extends from the outer circumference of the cover plate to the resilient area or also beyond the resilient area.
  • a metallic carrier body is preferably arranged within the cylindrical tubular magnetic element for improved magnetic inference.
  • the carrier body is at a predetermined distance from both the magnetic element and the cover disks.
  • this distance from the other components can be chosen to be significantly smaller than in the prior art, since no space has to be provided for holding adhesive, so that the magnetic losses can be minimized by forming a minimum distance.
  • the magnetic element is preferably surrounded by a cylindrical protective tube in order to prevent damage to the Avoid magnetic element.
  • the cylindrical protective tube provides anti-skid protection for chipped parts, so that jamming of the rotor can be prevented.
  • the magnetic element is preferably made of a rare earth magnetic material such as e.g. NdFeB or SmCo.
  • the cover disks are preferably made of a non-magnetic material, in particular stainless steel.
  • the cover disks are further preferably non-positively, positively or integrally with the rotor shaft, e.g. connected by pressing, laser welding or gluing.
  • the connection between the cover plate and the rotor shaft must be designed such that the required torques can be transmitted.
  • the rotor according to the invention is preferably used in an electrical machine designed as an EC motor, which is particularly preferably used as a drive for
  • Comfort devices in vehicles e.g. is used as a drive for electric windows, electric seat adjustments, electric sunroof, wiper motor, etc. It can also be used as an EC generator, for EC steering and as an engine compartment controller, e.g. Gear actuator or clutch actuator possible.
  • FIG. 1 is a schematic, exploded perspective view of a rotor unit of an electrical machine according to a first exemplary embodiment of the present invention
  • FIG. 2 is a schematic sectional view of the rotor arrangement shown in FIG. 1,
  • FIG. 3 shows a schematic side view of a cover plate used in FIGS. 1 and 2,
  • FIG. 4 shows a perspective sectional view of a cover plate according to a second exemplary embodiment of the present invention
  • FIG. 5 shows a schematic sectional view of a cover plate of a third exemplary embodiment according to the present invention
  • Figure 6 is a schematic sectional view of the cover plate shown in Figure 5.
  • Figure 7 is a schematic sectional view of a rotor assembly according to a fourth embodiment of the present invention.
  • FIG. 1 shows an exploded perspective view of a rotor arrangement 1 of the electrical machine.
  • the rotor arrangement 1 comprises a rotor shaft 2, a carrier body 4, a hollow cylindrical magnetic element 3, a first cover plate 5, a second cover plate 6 and a protective tube 10.
  • the carrier body 4 is fastened on the rotor shaft 2. This can be done, for example, by means of gluing or by means of a press fit.
  • the first cover plate 5 and the second cover plate 6 are also connected to the rotor shaft 2 in a rotationally fixed and axially fixed manner.
  • the magnetic element 3 is connected at its axial ends to a cover plate.
  • the axial end 3a of the magnetic element 3 is connected to the first cover plate 5 and the axial end 3b to the second cover plate 6 (cf. FIG. 2).
  • the connection between the cover plates 5, 6 and the axial ends 3a and 3b takes place by means of an adhesive.
  • the magnetic element 3 is arranged centrally to the rotor shaft 2.
  • Gap 11 extending circumferentially.
  • the gap is shown enlarged for clarity. Since the magnetic element 3 is fastened at its axial ends, the gap 11 between the magnetic element 3 and the carrier body 4 can have a minimal size. This also minimizes magnetic losses due to the gap 11.
  • between the two cover discs 5 and 6 and the support body 4 are also in each case a small 'gap 12 exists. This can prevent the carrier body 4 from touching one of the two cover disks 5, 6 at high temperatures during operation as a result of different thermal expansion coefficients.
  • the magnetic element 3 is made of a rare earth material and has a different thermal expansion from the carrier body 4 or the rotor shaft 2.
  • the different thermal expansion is compensated for by the first and second cover plates 5 and 6.
  • the cover disks 5 and 6 have a resilient area 7, which is provided by a circumferential bead.
  • a plurality of slots are formed in the cover plates. More precisely, long slots 8 with a first length A are formed in the cover disks. Between the long slots 8, several small slots 9 with a length B are formed.
  • the cover disks 5, 6 can perform length compensation in the radial direction as well as in the axial direction.
  • the cover plates 5, 6 are made of a non-magnetic stainless steel.
  • the adhesive connection between the cover disks 5, 6 and the magnetic element 3 can be provided in a simple method step.
  • the adhesive only has to be applied to the corresponding sections of the cover disks 5 and 6 lying on the radially outer region and / or the axial ends of the magnetic element and then the cover disks 5, 6 with the Magnetic element 3 are joined axially. This results in a significant simplification of the manufacturing process according to the invention, compared to the application of adhesive in a narrow, radial gap between the magnetic element and the carrier body as in the prior art.
  • the electrical machine with the integrated temperature compensation according to the invention thus has improved temperature resistance and thus improved possible uses.
  • a cover disk for a rotor according to the invention in accordance with a second exemplary embodiment of the present invention is described below with reference to FIG.
  • the cover disk 5 has a substantially cylindrical region 11 and a region 12 oriented essentially in the radial direction.
  • the cylindrical region 11 serves as a fastening region on a rotor shaft.
  • the radial region 12 comprises a resilient region 13 and a holding region 14 for the magnetic element.
  • the radial region 12 is arranged at an end of the cylindrical region 11 lying in the axial direction.
  • the resilient region 13 has an essentially U-shaped shape in section and provides a spring travel both in the radial direction and in the axial direction.
  • the cover plate 5 of the second embodiment is formed in one piece and is made, for example, by stamping and reshaping cylindrical tube piece manufactured.
  • the slots 8 between the individual radial segments of the radial region 12 are of the same depth.
  • the cylindrical region 11 of the cover disk ensures a fastening to the rotor shaft that is twisted in the circumferential direction and is fixed in the axial direction. This can be achieved, for example, by means of a press fit.
  • a cover plate 5 according to a third exemplary embodiment of the present invention is described below with reference to FIGS. 5 and 6.
  • the cover plate of the third exemplary embodiment essentially corresponds to the cover plate of the second exemplary embodiment and comprises a cylindrical region 11 and a radial region 12.
  • the radial region 12 is arranged at an axial end of the cylindrical region 11 and comprises a plurality of tab-like elements, which essentially are aligned in the radial direction.
  • the tab-like elements are each spaced apart from one another by a slot 8 of the same depth.
  • a holding area 14 for the magnetic element and a connecting area 15 are formed on the tab-like elements, which provides the connection between the cylindrical area 11 and the holding area 14.
  • connection area 15 is arranged at a predetermined angle to the cylindrical area 11. As shown in FIG. 6, the connection area 15 is inclined with a
  • the angle ⁇ is approximately 60 °.
  • the cover plate 5 of the third exemplary embodiment thus works on the principle of the springing open of the tab-like elements of the radial region 12.
  • the cover plate of the third exemplary embodiment also provides length compensation both in the radial and in the axial direction.
  • the cover plate of the third embodiment has a particularly compact and simple structure.
  • FIG. 7 shows a rotor arrangement according to a fourth exemplary embodiment of the present invention.
  • the view of the fourth exemplary embodiment essentially corresponds to the view of FIG. 2 of the first exemplary embodiment.
  • a cover plate 5 is used in the fourth exemplary embodiment.
  • a shaft shoulder 2a is formed on the rotor shaft 2, which has at least the same diameter as the outer diameter of the magnetic element 3.
  • the magnetic element 3 is supported at its second axial end 3b on the shaft shoulder 2a.
  • the first axial end 3a of the magnetic element 3 is fastened to a cover plate 5 as in the previous exemplary embodiments.
  • this cover disk 5 takes over all compensating movements in the axial and radial directions. It should be noted that, instead of the shaft shoulder 2a, another separate component which is fastened on the rotor shaft 2 can also be used. Otherwise, the fourth corresponds Embodiment in particular the first embodiment, so that reference can be made to the description given there.

Landscapes

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

Abstract

L'invention concerne une machine électrique comportant un arbre de rotor (2), un élément magnétique (3) cylindrique creux, un premier disque de recouvrement (5) et un deuxième disque de recouvrement (6), ces deux disques de recouvrement (5, 6) étant fixés sur l'arbre du rotor (2) et l'élément magnétique (3) étant fixé, par sa première extrémité axiale (3a) au premier disque de recouvrement (5) et par sa deuxième extrémité axiale (3b) au deuxième disque de recouvrement (6).
EP04762671A 2003-10-17 2004-08-17 Rotor a aimant permanent d'une machine electrique a haute resistance thermique Withdrawn EP1678806A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10348394A DE10348394A1 (de) 2003-10-17 2003-10-17 Rotor für eine elektrische Maschine mit verbesserter Temperaturbeständigkeit
PCT/DE2004/001827 WO2005046023A1 (fr) 2003-10-17 2004-08-17 Rotor a aimant permanent d'une machine electrique a haute resistance thermique

Publications (1)

Publication Number Publication Date
EP1678806A1 true EP1678806A1 (fr) 2006-07-12

Family

ID=34529666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04762671A Withdrawn EP1678806A1 (fr) 2003-10-17 2004-08-17 Rotor a aimant permanent d'une machine electrique a haute resistance thermique

Country Status (5)

Country Link
US (1) US7872388B2 (fr)
EP (1) EP1678806A1 (fr)
JP (1) JP2007507993A (fr)
DE (1) DE10348394A1 (fr)
WO (1) WO2005046023A1 (fr)

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AU2003281774B2 (en) * 2002-07-31 2007-02-15 Fisher & Paykel Healthcare Limited Isolated temperature sensor for humidification system
US20110062812A1 (en) 2008-06-25 2011-03-17 Alex Horng Rotor Structure Including Fixing Seats Securely Coupling A Shaft and A Magnet Together
US20100117473A1 (en) * 2008-11-12 2010-05-13 Masoudipour Mike M Robust permanent magnet rotor assembly
US20100247229A1 (en) * 2009-03-31 2010-09-30 Gm Global Technology Operations, Inc. End ring for a vehicular electric machine
EP2704294A1 (fr) * 2012-09-03 2014-03-05 Siemens Aktiengesellschaft Rotor d'une machine synchrone à excitation permanente
US9859761B2 (en) * 2013-02-12 2018-01-02 Asmo Co., Ltd. Rotor and motor
CN105122600B (zh) 2013-04-15 2018-03-02 三菱电机株式会社 旋转机械的转子
EP3292614A1 (fr) * 2015-05-06 2018-03-14 Arçelik Anonim Sirketi Ensemble rétenteur utilisable dans le moteur électrique d'un compresseur hermétique
US10720808B2 (en) 2015-11-23 2020-07-21 Ingersoll-Rand Industrial U.S., Inc. Method of making a permanent magnet rotor
TWI645655B (zh) * 2017-07-04 2018-12-21 建準電機工業股份有限公司 內轉子馬達之轉子
DE102020111416A1 (de) 2020-04-27 2021-10-28 Bayerische Motoren Werke Aktiengesellschaft Rotor sowie elektrische Maschine

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JPS60152239A (ja) * 1984-01-18 1985-08-10 Seiko Epson Corp 電子時計変換器のロ−タ−
JP2000069719A (ja) * 1998-08-21 2000-03-03 Shinko Electric Co Ltd 永久磁石型回転電機のロータ及びその製造方法
JP2001045703A (ja) * 1999-07-30 2001-02-16 Fujitsu General Ltd 電動機の回転子
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Title
See also references of WO2005046023A1 *

Also Published As

Publication number Publication date
US7872388B2 (en) 2011-01-18
US20070194648A1 (en) 2007-08-23
DE10348394A1 (de) 2005-06-02
JP2007507993A (ja) 2007-03-29
WO2005046023A1 (fr) 2005-05-19

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