EP3459158A1 - Rotor of an electric machine with a laminated core - Google Patents

Rotor of an electric machine with a laminated core

Info

Publication number
EP3459158A1
EP3459158A1 EP17717720.1A EP17717720A EP3459158A1 EP 3459158 A1 EP3459158 A1 EP 3459158A1 EP 17717720 A EP17717720 A EP 17717720A EP 3459158 A1 EP3459158 A1 EP 3459158A1
Authority
EP
European Patent Office
Prior art keywords
rotor
sub
region
laminated core
packages
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
EP17717720.1A
Other languages
German (de)
French (fr)
Inventor
Walter Wolf
Hubertus Büttner
Christian Kirchner
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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
Priority to DE102016208692.8A priority Critical patent/DE102016208692A1/en
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to PCT/EP2017/059088 priority patent/WO2017198406A1/en
Publication of EP3459158A1 publication Critical patent/EP3459158A1/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor
    • H02K1/272Inner rotor where the magnetisation axis of the magnets is radial or tangential
    • H02K1/274Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets
    • H02K1/2753Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276Magnets embedded in the magnetic core
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/28Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

A rotor (10) of an electric machine with a laminated core (12) is described, the latter comprising a first partial core (14a-d) with first sheet-metal laminates (16a-d) and a second partial core (14a-d) with second sheet-metal laminates (16a-d), and wherein the sheet-metal laminates (16a-d) and the partial cores (14a-d) are joined axially along a centre axis (A) of the laminated core (12). Each of the partial cores (14a-d) here has a radially inner circumferential region (24a-d) and a radially outer circumferential region (25a-d) and a plurality of connecting regions (18a-d) which are distributed in the circumferential direction, overlap one another at the joined partial cores (14a-d) and form a common connecting region (18) here. Furthermore, at least one of the partial cores (14a-d) comprises a fastening region (20b) for arranging the laminated core (12) on a support element, wherein, for the formation of said fastening region, a circumferential region (24b) is formed offset radially in relation to an axially adjacent circumferential region (24a, c). For interaction with a stator of an electric machine, the laminated core (12) has a magnetic interacting region (22) which is formed by one of the circumferential regions (25a-d) of the partial cores (14a-d). The rotor (10) is characterized in that the magnetic interacting region (22) comprises a plurality of rotor poles (26) which are distributed uniformly over the circumference and have permanent magnets (28).

Description

 Rotor of an electric machine with a laminated core

The invention relates to a rotor of an electrical machine with a laminated core according to the preamble of patent claim 1.

Such a generic rotor, which carries a rotor winding, in particular on a magnetic interaction area facing the stator, has already become known from EP 1 175 561 B1.

The object of the invention is to improve such a rotor.

The above object is achieved by a rotor of an electrical machine with a laminated core according to claim 1. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

It is thus proposed a rotor of an electric machine with a laminated core, which comprises a first sub-package with first laminations and a second sub-package with second laminations and wherein the laminations and the sub-packages are axially joined along a central axis of the laminated core. In this case, each of the sub-packages on a radially inner peripheral portion and a radially externa ßeren peripheral region and a plurality of circumferentially distributed connection areas, which are located on the joined sub-packages in mutual coverage and thereby form a common connection area. Furthermore, at least one of the sub-packages comprises a fastening region for arranging the laminated core on a carrier element, a circumferential region being designed to be radially offset relative to a circumferential region of an axially adjacent sub-package. The laminated core has for interaction with a stator of an electric machine on a magnetic interaction region which is formed by one of the peripheral regions of the sub-packages. The rotor is characterized in that the magnetic interaction region comprises a plurality of evenly distributed around the circumference rotor poles with permanent magnets. Accordingly, a rotor for a permanent-magnet electric machine is provided, wherein a fastening region for fixing to a carrier element is not formed on all partial pacts, but is present in particular only on one of the partial packets. In this case, a magnetic interaction region of the laminated core is provided at the peripheral region remote from the connection regions. A desired unhindered propagation of a rotor magnetic field within the laminated core can be achieved by forming the at least one fastening region on the same inner or outer circumferential region as the connecting regions. In this case, the attachment areas and the connecting portions may be staggered radially staggered on the laminated core, wherein in particular in a rotor of an internal rotor machine, the attachment regions are present as tabs and can be arranged offset radially inwardly relative to the connection areas on the laminated core. A connection region for connecting sheet metal laminations and partial packages can basically be designed in various ways. The connection region can be realized, for example, by means of a stamped package or have a screwed or riveted connecting bolt or a weld, which is designed solely on the laminated core or together with a connecting bolt.

According to a first advantageous embodiment of the invention, a sub-package for receiving the permanent magnets in the interaction region pockets, each rotor pole consists of two circumferentially adjacent permanent magnets, which are arranged together or separately in the pockets. The permanent magnets can be formed monolithic or segmented. In particular, the rotor may exemplarily have a total of 16 rotor poles or an integral multiple thereof and 32 permanent magnets or the integer multiple thereof. The pockets can be made radially open or closed. In the circumferential direction adjacent pockets of two adjacent rotor poles may preferably be separated by a gap.

According to a further advantageous embodiment, a plurality of attachment areas may be formed on a sub-package, which are arranged in the circumferential direction in each case between the connecting areas and preferably symmetrically thereto. With 16 rotor poles, the connection regions and also the attachment regions can each be designed to be mutually offset by 45 ° on the circumference.

At the same time, the sum of the number of connection regions and the number of attachment regions can correspond to the number of rotor poles on a partial package.

With particular advantage, the connecting regions can be arranged asymmetrically to the rotor poles on a sub-package, wherein in a lateral plane of the laminated core the connecting regions form an angle α to a plane of symmetry of the rotor poles. By axial joining of two mirror-image sub-pacts thus the rotor poles of these two axially adjacent sub-packages can be arranged in the circumferential direction offset by an angle 2a to each other. Advantage is a noticeable reduction of the magnetic cogging torque of an electric such electrical machine.

To achieve a high strength and durability can with further advantage, a connection region have an axially extending within the laminations recess into which an axially extending over both partial packages profile bar from a weldable material, for example a steel used and welded to the laminations , For captive recording of the profiled bar in a production of the edge region of a recess may have at least one projection for non-positive cooperation with the profile bar, so that this can be clamped or pressed there.

Furthermore, an axially extending free space can be formed radially between the profile bar and a proximate peripheral area of the laminated core for receiving weld metal. This space can also form a cooling channel for guiding a cooling fluid with appropriate dimensioning, so as to cool the rotor and in particular on the magnetic interaction area remote from the radial side. The invention will be explained by way of example with reference to an embodiment shown in the figures.

Show it:

 Figure 1 is a perspective view of a rotor of an electric machine with a laminated core, which comprises a plurality of axially staggered sub-packages. Fig. 2 is a plan view of the rotor of Fig. 1;

 3 is a fragmentary frontal view of the laminated core of Figure 1, 2 in a connecting region of the sub-packets ..;

 4 shows an axial partial view of the laminated core with the connection region shown in FIG. 3;

 5 shows an enlarged partial axial view of the laminated core with a fastening region;

 FIG. 6 is an enlarged partial front view of the laminated core of FIG. 5; FIG.

7 shows an enlarged partial front view of the laminated core with a connection region;

 8 is an enlarged partial front view of the laminated core with an alternative to FIG. 7 executed connecting region.

Identical objects, functional units or comparable components are denoted by the same reference numerals across the figures. Further, summary reference numbers are used for components and objects that occur multiple times in one embodiment or in one representation, but are described together in terms of one or more features. Components or objects which are described by the same or by the same reference numerals may be the same, but possibly also different, in terms of individual, several or all features, for example their dimensions, unless otherwise explicitly or implicitly stated in the description. In order to avoid repetition, a multiple description of identical objects, functional units or comparable components in various exemplary embodiments is dispensed with and only differences of the exemplary embodiments are described in this regard. The figures show a rotor 10 of an internal-rotor type electric machine, not illustrated in any more detail, with a laminated core 12 which comprises a total of four sub-packages 14a-d with laminations 16 ad and wherein the laminations 16a-d and the sub-packages 14a-d along a central axis A of Laminated core 12 and the electrical machine are axially joined. Each of the sub-packages 14a-d has a radially inner circumferential region 24a-d, a radially outer peripheral region 25a-d and a plurality of circumferentially distributed connecting regions 18a-d for connecting the lamellae 16a-d and for connecting the individual sub-packages 14a-d on. For this purpose, the connection areas 18a-d are brought into mutual coincidence with the joined partial packages 14a-d and thus form a plurality of common connection areas 18.

In the present case, the connecting regions 18 each have a recess 181 ad extending axially within the laminations 16a-d, in each of which a profiled bar 32 axially extending over all partial packs 14a-d is used made of a weldable material, in the present case a steel with the designation 1 .0122 and by means of two axially extending welds 36 is welded to the laminations 16 ad (Fig. 3, 4). For the captive installation of the profiled bars 32 before welding, as shown with reference to FIGS. 7, 8, protrusions 42 can be formed at the recesses 181 a-d, through which the profiled bars 32 can be pressed or clamped. In Fig. 7, two projections 42 are shown by plastic deformation of the edge portions of a recess 181, while the projections 42 are already provided in Fig. 8 as projecting into the recess 181 lugs on the sheet metal section.

In the radial direction, an axially extending free space 34 is formed between the profile bar 32 and the nearest circumferential area 24 of the laminated core 12, which space can receive the welds 36 or the weld metal. The clearance 34 may also or additionally form a cooling channel for guiding a cooling fluid on the rotor 10. Additional connection areas are in the form of Paketiernoppen 38, as shown in Figs. 5 and 6. Furthermore, in the exemplary embodiment discussed, only one of the sub-packages 14a-d, in the present case the sub-package 14b, comprises a plurality of attachment regions 20b located on a pitch circle for arranging the laminated core 12 on a carrier element, not illustrated here. The attachment regions 20b are arranged in the circumferential direction in each case between the connecting regions 18 and symmetrically thereto. In order to form the individual fastening regions 20b, the peripheral region 24b is formed offset relative to the peripheral regions 24a, c of the axially adjacent laminated cores 14a, c, respectively, as a radially inwardly directed tab and thus radially offset. The structural design of the attachment portions 20b can be made depending on the specific requirements. In the example, recesses or openings are provided in order to fix a carrier element there by means of rivets, bolts or the like radially, axially and circumferentially. In Fig. 2 it is visible that the connecting portions 18 and the mounting portions 20b are each offset by 45 ° to each other on the circumference.

Furthermore, the laminated core 12 for interacting with a stator of the electric machine, not shown here, a magnetic interaction region 22, which is formed by one of the peripheral regions 25a-d of the sub-packages 14a-d, in particular from the outer peripheral regions 25a-d. As can be seen in the figures, the rotor 10 for this purpose comprises a plurality of evenly distributed around the circumference rotor poles 26 with permanent magnets 28. The magnetic interaction region 22 is thus formed on the connecting regions 18a-d and also the mounting portion 20b remote circumferential regions 24a-d.

It can also be seen in the figures that pockets 30 for accommodating the permanent magnets 28 are formed on the radially outer circumferential regions 25a-d of the partial packages 14a-d. Each rotor pole 26 consists of two circumferentially adjacent and V-shaped aligned permanent magnets 28a, b, which are presently arranged in separate and circumferentially closed pockets 30a, 30b. The circumferentially adjacent pockets 30 of two adjacent rotor poles are separated on the laminated core 12 by a recess or by a gap 40.

In the illustrated embodiment, the rotor 10 has a total of 16 rotor poles with a total of 32 permanent magnets 28. Furthermore, the sum of the number of connection regions 18b and the number of attachment regions 20b corresponds exactly to the number of rotor poles 26 on the partial package 14b.

As can be clearly seen in FIGS. 2 and 6, the connecting regions 18 are arranged asymmetrically with respect to the rotor poles 26, the connecting regions 18 forming an angle α to a plane of symmetry S of the rotor poles 26 in a lateral plane of the laminated core 12. Furthermore, to reduce a force acting between the rotor 10 and a stator magnetic detent torque, the sub-packages 14c, d mirrored together, so that the rotor poles 26 of these sub-packages 14c, d offset in the circumferential direction by the angle 2 x α to each other.

REFERENCE CHARACTERS

10 rotor

 12 laminated core

 14a-d subpackage

 16a-d laminations

 18a-d connection area

 20b mounting area

 22 magnetic interaction area

24a-d radially inner peripheral region

 25a-d radially outer peripheral region

 26 rotor pole

 28a, b permanent magnet

 30a, b bag

 181 a-d recess

 32 profile bar

 34 free space

 36 weld

 38 Paketiernoppen

 40 gap

 42 lead

 A central axis

 S symmetry plane

α angle

Claims

Claims (10) an electric machine with a laminated core (12) comprising
- A first sub-package (14a-d) with first laminations (16 a-d) and a second sub-package (14a-d) with second laminations (16 a-d), wherein
 - The laminations (16a-d) and the sub-packages (14a-d) along a central axis (A) of the laminated core (12) are axially joined and wherein
 - Each of the sub-packages (14a-d) has a radially inner peripheral portion (24a-d) and a radially outer peripheral portion (25a-d) and wherein
 - Each of the sub-packages (14a-d) has a plurality of circumferentially distributed connection areas (18a-d), which are on the joined sub-packages (14a-d) are in mutual coverage and thereby form a common connection region (18)
 - At least one of the sub-packages (14a-d) at least one mounting portion (20b) for arranging the laminated core (12) on a support member, wherein for forming the mounting portion (20b) has a peripheral region (24b) against an axially adjacent peripheral portion (24a, c ) is formed radially offset and wherein
 - The laminated core (12) for interacting with a stator of an electric machine has a magnetic interaction region (22) which of one of the peripheral regions (25a-d) of the sub-packages (14a-d) is formed and
characterized in that
 - The magnetic interaction region (22) comprises a plurality of evenly distributed around the circumference rotor poles (26) with permanent magnets (28).
2. Rotor according to claim 1, characterized in that a sub-package (14 ad) for receiving the permanent magnets (28) in the interaction region (22) pockets (30), each rotor pole (26) of two circumferentially adjacent permanent magnets (28 a, b) which are arranged together or separately in the pockets (30).
3. Rotor according to claim 1 or 2, characterized in that on a sub-package (14b) a plurality of mounting portions (20b) are formed, which are arranged in the circumferential direction in each case between the connecting portions (18) and preferably symmetrically thereto.
4. Rotor according to one of claims 1 -3, characterized in that on a sub-package (14b), the sum of the number of connecting regions (18b) and the number of attachment regions (20b) corresponds to the number of rotor poles (26).
5. Rotor according to one of claims 1 -4, characterized in that the connecting regions (18) are arranged asymmetrically to the rotor poles (26) and wherein in a lateral plane of the laminated core (12), the connecting regions (18) an angle α to a plane of symmetry (S) include the rotor poles (26).
6. Rotor according to one of claims 1 -5, characterized in that the rotor poles (26) of two axially adjacent sub-packages (14c, d) in the circumferential direction by the angle 2 x α offset from one another.
7. Rotor according to one of claims 1 to 6, characterized in that a connecting region (18) has an inside of the laminations (16a-d) axially extending recess (181 ad), in which a over both partial packages (14a-d) inserted axially extending profile bar (32) and with the laminations (16 ad) is welded.
8. Rotor according to one of claims 1 -7, characterized in that radially between the profiled bar (32) and a proximal peripheral region (24) of the laminated core (12) an axially extending free space (34) is formed.
EP17717720.1A 2016-05-20 2017-04-18 Rotor of an electric machine with a laminated core Pending EP3459158A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102016208692.8A DE102016208692A1 (en) 2016-05-20 2016-05-20 Rotor of an electric machine with a laminated core
PCT/EP2017/059088 WO2017198406A1 (en) 2016-05-20 2017-04-18 Rotor of an electric machine with a laminated core

Publications (1)

Publication Number Publication Date
EP3459158A1 true EP3459158A1 (en) 2019-03-27

Family

ID=58548714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17717720.1A Pending EP3459158A1 (en) 2016-05-20 2017-04-18 Rotor of an electric machine with a laminated core

Country Status (4)

Country Link
US (1) US10601270B2 (en)
EP (1) EP3459158A1 (en)
DE (1) DE102016208692A1 (en)
WO (1) WO2017198406A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017223622A1 (en) * 2017-12-21 2019-06-27 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Rotor for an electric motor and electric motor

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT10720B (en) 1900-12-29 1903-02-10 Paul Hallot Railway car friction brake.
JPS6464548A (en) * 1987-09-03 1989-03-10 Fanuc Ltd Rotor construction of synchronous motor
US5704111A (en) * 1995-05-24 1998-01-06 General Electric Company Method for making a rotor for an electric motor
DE19955050A1 (en) 1999-11-15 2001-06-07 Bosch Gmbh Robert Rotor body
US6408502B1 (en) * 2001-05-18 2002-06-25 General Electric Company Method for a resilient rotor core assembly
JP2006158012A (en) * 2004-11-25 2006-06-15 Honda Motor Co Ltd Method of manufacturing permanent magnet for use in ipm-type motor for automobile
US8035273B2 (en) 2005-12-08 2011-10-11 A.O. Smith Corporation Rotor assembly having two core portions each with a reduced back portion
AT10720U1 (en) * 2006-01-27 2009-08-15 Magna Drivetrain Ag & Co Kg Rotor and manufacturing of electric motor with lowering gear
DE112007002887T5 (en) * 2006-11-27 2009-09-24 Honda Motor Co., Ltd. Apparatus for producing a toroidal core, process for producing a toroidal core and toroidal core produced by this process
DE102009017850A1 (en) * 2009-04-17 2010-10-21 Siemens Aktiengesellschaft Runner for an electric machine
CN102111025B (en) * 2009-12-25 2013-03-27 中山大洋电机股份有限公司 Permanent magnet rotor of electric motor
BR112013005959A2 (en) * 2010-09-17 2016-05-03 Höganäs Ab Publ "rotor for modulated pole machine"
JP5565365B2 (en) * 2011-04-01 2014-08-06 株式会社デンソー Rotor for rotating electrical machine and method for manufacturing the same
JP5382156B2 (en) * 2012-03-06 2014-01-08 三菱電機株式会社 Rotating electric machine
DE102012215241A1 (en) * 2012-08-28 2014-03-06 Siemens Aktiengesellschaft Rotor of an electric machine and electric machine

Also Published As

Publication number Publication date
CN109155555A (en) 2019-01-04
WO2017198406A1 (en) 2017-11-23
US20190207444A1 (en) 2019-07-04
DE102016208692A1 (en) 2017-11-23
US10601270B2 (en) 2020-03-24

Similar Documents

Publication Publication Date Title
EP0823771B1 (en) Motor
RU2613664C2 (en) Rotor and jet inductor engine
US5829120A (en) Method for manufacturing a rotor for synchronous motor
EP1283581B1 (en) Rotor for permanent magnet motor
US20170149319A1 (en) Rotating Electric Machine and Method for Manufacturing the Rotating Electric Machine
US5786650A (en) Rotor for synchronous motor
JP3950378B2 (en) Synchronous machine
US9231445B2 (en) Rotor for the electric machine
US8304949B2 (en) Axial gap motor
US8203246B2 (en) Five-phase motor with improved stator structure
US20120286593A1 (en) Stator and motor
US9154005B2 (en) Rotor core for rotating electrical machine, and manufacturing method thereof
KR20140105854A (en) Rotor blade set of an electric motor
US20120187794A1 (en) Lundell type rotating machine
US9762098B2 (en) Electric motor having embedded permanent magnets
EP1490950B1 (en) Electric machine with inner and outer rotor
EP0582721A1 (en) Rotor of synchronous motor
US20090102314A1 (en) Rotating electrical machinery
US9705366B2 (en) Embedded permanent magnet rotary electric machine
EP2626975A2 (en) Rotor assembly for motor and manufacturing method thereof
US20130119789A1 (en) Multiple-gap electric rotating machine
US20020140308A1 (en) Brushless DC motor and method of manufacturing brushless DC motor
KR20050057432A (en) Laminated stator core
US9941756B2 (en) Rotor for an electric machine, an electric machine and method for manufacturing an electric machine
US20050099086A1 (en) Electric machine

Legal Events

Date Code Title Description
17P Request for examination filed

Effective date: 20181025

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AV Request for validation of the european patent

Extension state: MA MD

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)