WO2019179864A1 - Rotor d'une machine électrique à aimants permanents - Google Patents

Rotor d'une machine électrique à aimants permanents Download PDF

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Publication number
WO2019179864A1
WO2019179864A1 PCT/EP2019/056380 EP2019056380W WO2019179864A1 WO 2019179864 A1 WO2019179864 A1 WO 2019179864A1 EP 2019056380 W EP2019056380 W EP 2019056380W WO 2019179864 A1 WO2019179864 A1 WO 2019179864A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
magnets
recesses
pockets
recess
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.)
Ceased
Application number
PCT/EP2019/056380
Other languages
German (de)
English (en)
Inventor
Matthias BERINGER
Stephan TENNER
Matthias Cudok
Philipp NEIDHARDT
Walter Wolf
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
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO2019179864A1 publication Critical patent/WO2019179864A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H02K1/274—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
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a rotor of a permanent magnet-excited electrical machine according to the preamble of patent claim 1, as has already become known by way of example with DE 10 2008 059 347 A1.
  • the object of the invention is to present a rotor equipped with permanent magnets of an electrical machine with a high magnetic power density. Furthermore, such a rotor is to be represented, in which the magnets are additionally reliably supported even under high speeds, in particular occurring in a drive train of a vehicle relative to operational centrifugal forces and wherein the rotor has a high dimensional stability even under such a speed influence and the permanent magnets are secured shatterproof.
  • these requirements should also be met beyond the stated range, in particular in a range above approximately 7,000 revolutions to approximately 20,000 revolutions per minute.
  • the mass moment of inertia of the rotor should be kept comparatively low.
  • At least one of the above objects is achieved by a rotor having the features specified in claim 1 and by an electric machine using such a rotor according to claim 5.
  • FIG. 1 is a partial end view of a permanent magnet rotor with pockets formed therein for receiving permanent magnets.
  • FIG. 2 is a partial end view of the permanent magnet rotor of FIG. 1 with permanent magnets disposed in pockets;
  • FIG. Fig. 3 shows the arrangement of Fig. 2 with further registered feature names.
  • the figures show a frontal plan view of a rotor R for a permanent magnet excited electric machine, in which a plurality of permanent magnets PM completely in a radial space between a rotation axis and a center Z and an outer peripheral surface U and a Outside ßeren edge of the rotor R are arranged.
  • a rotor R with buried magnets which in the exemplary embodiment is designed as an internal rotor.
  • the rotor R has a rotor body RK, which in the present case is made of individual laminations L stacked in one direction along the axis of rotation and made of an electrical sheet.
  • Fig. 1 shows a section of the rotor R and also in sections the formation of a single lamination L.
  • the used electric sheet may consist of a known material, for example with the well-known in the art designation NO30-15.
  • the rotor body RK can also be formed as a solid part, for example of a sintered material.
  • the permanent magnets PM or short magnets are not subject to any special features or restrictions with regard to the material system.
  • the magnets may contain rare earth elements and in particular belong to the material system neodymium-iron-boron (Nd-Fe-B).
  • an electric machine basically also comprises a stator with a stator winding, which is designed to enter into a magnetic interaction with the rotor explained in more detail below. On a representation and detailed description of the stator is omitted, since this is not a subject of the invention treated here and its basic structure is well known to those skilled in the art.
  • An electric machine based on the proposed rotor R can be operated both as a motor and as a generator, and can be used, for example, as a drive source in an electric or hybrid vehicle.
  • FIGS. 1-3 each show a 45.degree. Sector of the rotor R or an octet circle thereof.
  • the arrangement shown occurs on the rotor R or on a lamination L thus a total of 8 times.
  • the existing in the entire sector SE geometric arrangement of magnets and recesses forms a geometric motif. So a total of 8 motives are formed on a full circle, which can be converted into each other by a rotation by one-eighth of the rotor axis or by reflection at an axial plane.
  • the permanent magnets PM1 -6 used generally have a cuboid shape and are formed in the rectangular cross-section shown with a long side M1 and a short side M2.
  • the magnets PM In the extension, which is not shown here in the axial direction of the rotor R, the magnets PM have an axial extent or a depth M3.
  • the edges K extending in the axial direction in the abutting region of the sides M1 and M2 may be rounded off to form an edge radius PMR.
  • the magnets PM can be segmented for the suppression of eddy currents in the axial direction to form individual magnetic blocks and be mutually electrically isolated, wherein the rotor R several such blocks can follow each other axially.
  • the illustrated rotor cross-section thus comprises a total of 48 magnets PM.
  • the magnets PM each have a magnetic north pole and a south pole, which are each formed by a long side M1.
  • the magnetic flux permeating the magnets PM emerges vertically from the longitudinal sides or into them and runs in the direction of the surface normals of the sides M1.
  • each permanent magnet PM1 -6 is accommodated in a magnetic pocket T1 -6.
  • magnet receiving areas TM1 -6 are provided within the pockets T, of which an edge R1 -6 abuts at least on the longitudinal sides M1 of the magnets PM.
  • the number of pockets T or the number of magnet receiving areas TM corresponds to the number of magnets PM.
  • the pockets T are dimensioned and designed in the region of the magnets PM so that the magnets PM can be axially inserted into the laminated core or the rotor body RK and clamped there.
  • the magnets PM are characterized fixed in particular in the radial and in the axial direction against operational forces.
  • the magnets PM and the pockets T are recognizably arranged in two radially staggered V-shaped groups V1, V2, which form a first group V1 with magnets PM1, 2 and a second group 2 with magnets PM3-6.
  • the pockets T of a group V or the two legs V1 .1, V1 .2; V2.1, V2.2 of a V are arranged inclined to each other.
  • Each pocket T has, for the purpose of forming a magnet receiving region TM at its boundary R, two mutually parallel sides RM which interact with the longitudinal sides M1 and in this way virtually coincide.
  • each group V are radially inwardly closer together than radially outward and close in the radially innermost region in each case a web S1, S2 with mutually parallel sides S1 .1, S1 .2; S2.1, S2.2, where, however, instead of parallel straight lines, alternatively or additionally, curved boundary lines can also be implemented.
  • the angle between two associated V-limbs V1 .1, V1 .2 or V2.1, V2.2 can basically be an acute, a right, a blunt or even an extended angle.
  • the first, radially outer V-shaped group V1 comprises two pockets T1, T2, which include a sector SE1 with an angle a1 (alpha 1), which in the exemplary embodiment is about 90 °.
  • Each of the two V-legs of this group V1 is formed by exactly one pocket T.
  • the two pockets T1, T2 of the first group V1 are arranged on the lamination L with respect to a radius vector RR1 of the rotor R mirror-symmetrical and positioned at an angle of approximately 45 ° to the radius vector RR1.
  • the second, radially inner V-shaped group V2 comprises a total of four pockets T3-T6, which include a sector SE2 with an angle a2 (alpha 2), which in the figure is about 82 °. In the present case, therefore, the angle is cd> a2 (alpha 1> alpha 2).
  • Each of the two V-legs V2.1, V2.2 of this group V2 is defined by exactly two pockets T3, T4; T5, T6, which follow one another along a straight line in each case in the direction of the long side M1.
  • the four pockets T of the second group V2 are likewise located on the lamination L with respect to the radius vector RR1. arranged symmetrically and are positioned at an angle of approximately 41 °, thus less than 45 ° to the radius vector RR1.
  • the two groups V1, V2 are arranged such that their mirror plane coincides with an axial plane and the radius vector RR1 passing through it.
  • the pockets T3-T6 and the magnets PM3-PM6 of the second group V2 thus span a spatial region or the sector SE2, in which the magnets PM1, 2 of the first group V1 are arranged.
  • the magnets PM of the first group V1 are enclosed by the magnets PM of the second group V2, the sector SE2 being bounded by an associated area of the outer circumference U of the rotor R.
  • two adjacent to the cross section shown in the circumferential direction adjacent motives are arranged in mirror image, the mirror plane coincides with a radius vector RR2.
  • an inner radius IR of the laminated core is about 2 length units and an outer radius OR is about 7 linear units, so that the laminated core has a radial extent of about 5 length units.
  • the side M1 of a magnet PM in this case is about 1 to 1, 6, in particular about 1, 3 units of length.
  • the quantities M1, ID and OD thus relate to one another such as (1 .... 1, 6): 2: 7.
  • the pockets T are enlarged relative to the magnets PM and, in addition to the magnet receiving areas TM and thus adjacent to the short side M2 of the magnets PM on both sides, have recesses or recesses C2, C20 and C4, respectively. Furthermore, recesses C1, C30 are provided in the vicinity of magnets PM, which are formed separately from the pockets T and which will be explained in detail below.
  • the recesses C extend in the axial direction through the rotor.
  • a recess C1 is formed in the sector SE1 which is stretched open by the first group V1 and occupies therein a comparatively large area of a lamination L or of the rotor body RK.
  • These Recess C1 is formed with respect to an axial section plane symmetrical to the two adjacent magnets PM1, PM2 and in the radial direction approximately centrally to a shortest connecting line 11 of the magnets PM1, PM2 and the outer boundary U of the blade L and the rotor R arranged (Fig.3 ).
  • the recess C1 is formed as a rounded triangle, wherein in principle other shapes are possible.
  • the recess C1 serves to reduce the mass inertia of the rotor R overall and in particular to reduce the mass of the rotor body RK enclosed between the magnets PM1, PM2 of the first group V1.
  • the recess C1 thus acts as a mass relief opening and is formed radially outside of the web S1, which space the two magnets PM 1, PM2 and the pockets T1, T2 in the circumferential direction.
  • the web S1 supports a space region of the rotor body RK which is radially outside this and is enclosed by the two magnets PM1, PM2 against forces acting on it.
  • the cross-section of the recess C1 behaves like the area enclosed by the web S1 and enclosed by the adjacent or associated magnets PM1, 2, such as 1: 5.
  • said ratio can also be smaller and larger, and in particular in a range from about 1: 7 or greater.
  • the web S1 forms an inner support section, which together with one each formed between the radially outer portions of a magnet and the edge region further web S3, S4 supports said region.
  • the further webs S3, S4 form outer support areas.
  • the area between the magnets PM1, PM2 is thus held by a total of three support areas S1, S3, S4.
  • the mass relief of the web S1 can thus be made weaker and in particular in the circumferential direction of the rotor R narrower.
  • the magnets PM1, PM2 adjacent to the recess C1 are displaced further outward into the edge region of the rotor R near the peripheral surface U in the radial direction. It can be seen in the figures that the distance of the magnets PM1, PM2 from the edge region U of the rotor R is smaller than a width of the web S1 and is only approximately half the web width.
  • the recess C1 is arranged outside a main magnetic flux passing through the rotor R, which would propagate there in the absence of a recess C1.
  • the recess is arranged in a region with a magnetic flux which is small relative to a main magnetic flux or in a region which is essentially free of magnetic flux.
  • the recesses C1 do not constitute flow barriers for selectively influencing the magnetic flux within the rotor body.
  • the geometric design and the positioning of the recess C1 in the illustrated and explained manner thus lead in comparison to a closed there rotor body to only a small and minimized influence of the magnetic flux, the above-mentioned positive aspects significantly outweigh.
  • the provision of recesses and the associated mass reduction in a radially outer region of the rotor are associated with a positive effect, especially at high speeds.
  • the recesses C1 are provided in particular in a radial region above or from about 6/7 of the radius OR and in particular between about 6/7 and 7/7 of the radius OR.
  • the magnets PM are fixed in a frictional manner by clamping within the magnet receiving areas TM.
  • the clamping can form an exclusive method of attachment. If necessary, however, alternatively and / or in addition to a bonding of the magnets PM respectively.
  • comparatively small recesses C2 are provided at edge positions of the magnet receiving areas TM or in the end areas of the parallel sides M1 exemplified for the magnet PM3 in Fig. 2 and designated there.
  • Corresponding recesses C2 are provided on all pockets T1 -6. These recesses C2 are formed in regions of the edges K of the magnets PM formed by the sides M1, M2 and extending along M3, and each have a curved contour with comparatively small radii. The said edges K of the magnets PM are thus free and do not abut the edges R of the pockets T. As a result, the magnets PM are not exposed to increased mechanical loads in these particularly fracture-sensitive zones even under operating conditions.
  • recesses C20 Adjacent to the radially outer regions of the four magnets PM1 -4 of the second group V2, recesses C20 are made over the entire width of side M2, which interconnect the recesses C2 present at the edges K (FIG. 2).
  • the sides M2 are thus completely free.
  • the magnets PM may be K eckig or with an edge radius in the region of these edges. In the latter case, the radius can at least fall on the order of magnitude of the edge radius of the magnets.
  • the permanent magnets PM are joined over their entire sides with their sides M1 to the rotor body RK. More specifically, the permanent magnets PM are joined only to the sides M1 to the rotor body RK and the two sides M2 are free. According to a preferred manner of attachment, the permanent magnets PM are joined exclusively to the rotor body RK in a force-fitting manner, in particular pressed in.
  • recesses C3 are provided, which act as obstacles in the propagation of the magnetic flux. In this way, unwanted magnetic short circuits in the rotor R can be avoided and simultaneously achieved that the magnetic flux can propagate in a defined manner on a desired path between the rotor R and a stator.
  • Such recesses C3 are provided in the embodiment discussed in a radially outer region of the rotor R and thus close to the outer peripheral surface U.
  • the pockets T1, T2 of the first group V1 have extensions whose radially outer boundary is formed at least approximately parallel to the outer peripheral surface U of the rotor and thus bounds the webs S3, S4. In the present case, these extensions or recesses C3 are in particular approximately triangular in shape. In principle, other forms can also be used.
  • the radially outer pockets T3, T6 of the second group V2 have a larger radial distance to the outer peripheral surface U of the rotor R than the pockets T1, T2 of the first group V1.
  • the respectively assigned recesses C30 and flux barriers are designed separately from the magnetic pockets T3, T6.
  • the recesses C30 are also formed approximately triangular with an at least approximately parallel to the outer peripheral surface U of the rotor R extending radially outer boundary, whereby there are webs S9, S10.
  • further webs S5, S6 are provided between the recesses C20 and C30, which adjoin the said recesses with two parallel edges.
  • T6 further webs S7, S8 are formed.
  • recesses or recesses C4 serving as flow barriers are likewise connected to the respective radially innermost pockets T1, T2 and T4, T5 of the first and second group V1, 2, in particular in a foot region F of the respective V Arrangement provided, on which the magnets PM of a group V in the circumferential direction closest together.
  • the webs S1, S2 are thus also in the respective Fu ß Scheme F1, F2 is.
  • These recesses C4 generally have an asymmetrical shape and in the exemplary embodiment are approximately asymmetrically drop-shaped. With reference to the figures, it can be seen that the recesses C4 have a main extension direction approximately at the center of the rotor R.
  • the maximum extent C4R of the recesses C4 located outside a magnet PM in the radial direction is appreciably greater than its maximum extent C4U in the circumferential direction of the rotor body RK (FIG. 1).
  • the ratio is about 1.8: 1.
  • Particularly advantageous is a ratio from about 1, 3: 1 and larger.
  • parallel edges S1 .1, S1 .2 are respectively provided on two recesses C4 adjacent in the circumferential direction.
  • S2.1, S2.2 provided, which thus extend substantially in the direction of the radius vector RR1.
  • the respectively radially outer structural regions of the rotor R are mechanically supported. Even with these recesses C4 rounded contour lines are formed to avoid mechanical stress peaks.
  • the maximum radii used in this case are based on the previously explained recesses C2, C20, C3,

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

Abstract

L'invention concerne un rotor (R) d'une machine électrique à aimants permanents, qui comprend un corps de rotor (RK) ayant un axe central (A) et une surface périphérique (U) extérieure, une pluralité de poches (T) ayant des aimants permanents (PM) disposés dans celles-ci étant prévues dans une région radiale entre l'axe central (A) et la surface périphérique (U). Afin d'optimiser un flux magnétique, selon l'invention une poche (T) comporte une zone de réception magnétique (TM) pour positionner un aimant permanent (PM) et une région évidée ou un évidement (C4) pour former une barrière de flux magnétique, une extension (C4R) de l'évidement (C4) dans le sens radial étant supérieure à une extension (C4U) de l'évidement (C4) dans le sens périphérique du corps du rotor (RK).
PCT/EP2019/056380 2018-03-21 2019-03-14 Rotor d'une machine électrique à aimants permanents Ceased WO2019179864A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018204298.5A DE102018204298A1 (de) 2018-03-21 2018-03-21 Rotor einer permanentmagneterregten elektrischen Maschine
DE102018204298.5 2018-03-21

Publications (1)

Publication Number Publication Date
WO2019179864A1 true WO2019179864A1 (fr) 2019-09-26

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PCT/EP2019/056380 Ceased WO2019179864A1 (fr) 2018-03-21 2019-03-14 Rotor d'une machine électrique à aimants permanents

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DE (1) DE102018204298A1 (fr)
WO (1) WO2019179864A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021169956A1 (fr) * 2020-02-28 2021-09-02 丹佛斯（天津）有限公司 Rotor, moteur à aimant permanent intégré, et compresseur
WO2022175614A1 (fr) 2021-02-22 2022-08-25 Nidec Psa Emotors Rotor de machine électrique tournante
FR3121294A1 (fr) 2021-03-29 2022-09-30 Nidec Psa Emotors Rotor de machine électrique tournante

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020130988A1 (de) 2020-03-17 2021-09-23 Schaeffler Technologies AG & Co. KG Verfahren zur Herstellung einer Schichtanordnung aus Elektroblech, danach hergestellte Schichtanordnung, Rotor oder Stator sowie Elektromotor
DE102023205769A1 (de) * 2023-06-20 2024-07-11 Magna powertrain gmbh & co kg Rotor einer permanentmagneterregten elektrischen Maschine
CN121283063A (zh) * 2024-07-04 2026-01-06 纬湃汽车电子(天津)有限公司 转子和具有该转子的同步磁阻电机

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DE102008059347A1 (de) 2007-11-30 2009-06-25 GM Global Technology Operations, Inc., Detroit Verfahren und Vorrichtungen für eine Permanentmagnetmaschine mit einer zusätzlichen Luftbarriere
JP2014196535A (ja) * 2013-03-29 2014-10-16 日新製鋼株式会社 弱め界磁性に優れたｉｐｍモータのロータ鉄心用鋼板及びその製造方法
US20150263574A1 (en) * 2012-12-12 2015-09-17 Mitsubishi Electric Corporation Rotor of motor
US20150295462A1 (en) * 2014-04-15 2015-10-15 Denso Corporation Rotor for a rotary electric machine
US20170338707A1 (en) * 2014-12-22 2017-11-23 Mitsubishi Electric Corporation Rotor for rotary electrical machine
US20180041080A1 (en) * 2015-05-19 2018-02-08 Mitsubishi Electric Corporation Rotor, rotary electric machine, and method for manufacturing rotor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008059347A1 (de) 2007-11-30 2009-06-25 GM Global Technology Operations, Inc., Detroit Verfahren und Vorrichtungen für eine Permanentmagnetmaschine mit einer zusätzlichen Luftbarriere
US20150263574A1 (en) * 2012-12-12 2015-09-17 Mitsubishi Electric Corporation Rotor of motor
JP2014196535A (ja) * 2013-03-29 2014-10-16 日新製鋼株式会社 弱め界磁性に優れたｉｐｍモータのロータ鉄心用鋼板及びその製造方法
US20150295462A1 (en) * 2014-04-15 2015-10-15 Denso Corporation Rotor for a rotary electric machine
US20170338707A1 (en) * 2014-12-22 2017-11-23 Mitsubishi Electric Corporation Rotor for rotary electrical machine
US20180041080A1 (en) * 2015-05-19 2018-02-08 Mitsubishi Electric Corporation Rotor, rotary electric machine, and method for manufacturing rotor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021169956A1 (fr) * 2020-02-28 2021-09-02 丹佛斯（天津）有限公司 Rotor, moteur à aimant permanent intégré, et compresseur
US12368333B2 (en) 2020-02-28 2025-07-22 Danfoss (Tianjin) Ltd. Rotor, interior permanent magnet motor, and compressor
WO2022175614A1 (fr) 2021-02-22 2022-08-25 Nidec Psa Emotors Rotor de machine électrique tournante
FR3120168A1 (fr) 2021-02-22 2022-08-26 Nidec Psa Emotors Rotor de machine électrique tournante
US12597815B2 (en) 2021-02-22 2026-04-07 Nidec Psa Emotors Rotor for a rotary electric machine
FR3121294A1 (fr) 2021-03-29 2022-09-30 Nidec Psa Emotors Rotor de machine électrique tournante
WO2022207985A1 (fr) 2021-03-29 2022-10-06 Nidec Psa Emotors Rotor de machine électrique tournante

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