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WO2025191619A1 - Rotor pour machine électrique et machine électrique comprenant un tel rotor - Google Patents

Rotor pour machine électrique et machine électrique comprenant un tel rotor

Info

Publication number
WO2025191619A1
WO2025191619A1 PCT/IT2025/050048 IT2025050048W WO2025191619A1 WO 2025191619 A1 WO2025191619 A1 WO 2025191619A1 IT 2025050048 W IT2025050048 W IT 2025050048W WO 2025191619 A1 WO2025191619 A1 WO 2025191619A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow barrier
opening angle
whose
external
internal
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
PCT/IT2025/050048
Other languages
English (en)
Inventor
Davide Bettoni
Luca FAVRE
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.)
Mavel EDT SpA
Original Assignee
Mavel EDT SpA
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 Mavel EDT SpA filed Critical Mavel EDT SpA
Publication of WO2025191619A1 publication Critical patent/WO2025191619A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • 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 present invention relates to a rotor for an electric machine , and to an electric machine comprising said rotor .
  • the invention relates to a rotor for a synchronous reluctance electric machine , of the permanent magnet type .
  • An electric machine typically comprises a fixed part , the stator, and a moving part , the rotor, arranged coaxially one inside the other .
  • the rotor is located inside the stator, which comprises electric coils capable of generating a magnetic field that allows the rotor to rotate .
  • the rotor typically comprises a body consisting of a pack of laminations and positioned on a rotation shaft .
  • the laminations comprise seats for permanent magnets .
  • An obj ect of the present invention is obtaining a rotor for an electric machine and an electric machine that guarantee better ef ficiency, allowing to obtain better performance with a high "air gap" , which entails greater machining tolerances of the rotor and lower costs .
  • Another obj ect of the present invention is reducing torque ripple and back-electromotive force harmonics .
  • FIG . 1 shows a front view of a rotor for an electric machine according to the invention
  • FIG . 2 shows enlarged details of a rotor for an electric machine according to the invention
  • FIG . 3 shows a partial view of two poles and an enlarged detail of a rotor for an electric machine according to the invention.
  • FIG . 4 shows a partial view of two poles of a rotor for an electric machine according to the invention .
  • the rotor 1 for an electric machine comprises : a rotation shaft ; a lamellar pack fixed on the rotation shaft and comprising a plurality of identical laminations 3 , comprising a central hole 2 crossed by the rotation shaft and a plurality of axial cavities 6 , 7 , 8 that cross the laminations 3 from side to side .
  • each sheet 3 comprises : a plurality of pairs of first 6 and second 7 axial cavities , preferably of trapezoidal , rectangular, parallelogram or square shape , arranged radially one below the other and spaced apart from each other, inclined with respect to the radial direction; the sheets 3 also comprise magnetic flow generators inserted in the first 6 and second 7 axial cavities , preferably permanent magnets in the form of bars , and a plurality of third axial cavities 8 having an inclined direction with respect to the radial direction and with respect to the direction of the second axial cavities 7 , said third axial cavities 8 starting from the second axial cavities 7 to arrive in the vicinity of the edge of the sheet 3 .
  • each sheet 3 comprises a plurality of pairs of first 6 and second 7 axial cavities inclined and arranged symmetrically with respect to a radius Rl , R2 of the sheet 3 passing through the centre C of rotation of the rotor 1 , each of said first 6 and second 7 axial cavities starts from another first 6 and second 7 axial cavities to arrive respectively in proximity to the edge of the sheet 3 and in proximity to the third axial cavities 8 incl ined with respect to the radial direction and with respect to the direction of the second axial cavities 7 .
  • said first axial cavities 6 comprise a first surface 31 substantially parallel to the edge of the sheet 3 , connected with a first lateral surface 41 and a second lateral surface 51 by means of at least one hollow sector 35 to form a protrusion; furthermore , the first surface 31 is connected with the first lateral surface 41 and with the second lateral surface 51 by means of two connecting radii R .
  • the first surface 31 is connected to the first lateral surface 41 by the hollow sector 35 and the first lateral surface 41 and the second lateral surface 51 are parallel to each other .
  • the third axial cavities 8 having an inclined radial direction, have a first surface 12 substantially parallel to the edge of the sheet metal 3 , connected to a first lateral surface 22 and a second lateral surface 23 by means of two connecting radii R, as shown in the enlarged detai l of figure 3 ; furthermore , the third axial cavities 8 have a second surface 18 substantially parallel to a first surface 32 of the second axial cavities 7 , said first surface 32 being connected to a first lateral surface 42 and a second lateral surface 52 by means of at least one hollow sector 36 to form a protrusion; furthermore , the first surface 32 is connected to the first lateral surface 42 and to the second lateral surface 52 by means of two connecting radii R; preferably, the first surface 32 is connected to the first lateral surface 42 by means of the hollow sector 36 , furthermore the first lateral surface 42 and the second lateral surface 52 are parallel to each other .
  • each of said first 6 and second 7 axial cavities comprises a second surface 34 connected to the first lateral surface 41 , 42 and to the second lateral surface 51 , 52 of said first 6 or second 7 inclined axial cavities by means o f at least one hollow sector 38 to form a protrusion .
  • the rotor 1 comprises six magnetic poles 13 , 14 , each comprising three flow barriers
  • each flow barrier 9 , 10 , 11 comprises : a pair of axial cavities 6 , 7 inclined and arranged symmetrically with respect to a radius Rl , R2 of the lamination 3 passing through the centre C of rotation of the rotor 1 and suitable for hous ing a flow generator, preferably a permanent magnet .
  • each flow barrier 9 comprises : a pair of axial cavities 6 , 7 inclined and arranged symmetrically with respect to a radius Rl , R2 of the lamination 3 passing through the centre C of rotation of the rotor 1 and suitable for hous ing a flow generator, preferably a permanent magnet .
  • the external flow barrier 11 comprises a pair of first axial cavities 6 inclined and arranged symmetrically with respect to a radius Rl , R2 of the lamination 3 passing through the centre C of rotation of the rotor 1 and suitable for hosting a flow generator, preferably a permanent magnet ; said pair of first axial cavities 6 forms a figure similar to a "V" , whose inclined arms are formed by the pair of f irst axial cavities 6 having their respective second surfaces 34 parallel to each other in the direction of the radius Rl , R2 of the lamination 3 .
  • the intermediate flow barrier 10 and the internal flow barrier 9 comprise : a pair of second axial cavities 7 inclined and arranged symmetrically with respect to a radius Rl , R2 of the lamination 3 passing through the centre C of rotation of the rotor 1 and suitable for housing a flow generator, preferably a permanent magnet , and a pair of third axial cavities 8 inclined and arranged symmetrically with respect to said second axial cavities 7 .
  • each intermediate f low barrier 10 and internal flow barrier 9 forms a figure similar to a "V" , the inclined arms of which are formed by the pair of second axial cavities 7 and third axial cavities 8 , said second axial cavities 7 having their respective second surfaces 34 parallel to each other in the direction of the radius Rl , R2 of the lamination 3 .
  • Each flow barrier 9 , 10 , 11 corresponds to an opening angle 013 which defines the width of the "V" shape ( Fig . 4 ) .
  • opening angles 013 are identi fied by two straight lines , each passing through the second lateral surfaces 51, 52 of the first 6 and second 7 inclined axial cavities of each flow barrier 9, 10, 11.
  • the rotor 1 comprises three primary magnetic poles 13 and three secondary magnetic poles 14, each comprising three flow barriers 9, 10, 11.
  • each of the three primary magnetic poles 13 preferably comprises an external flow barrier 11 whose opening angle 013 is substantially equal to 124° ⁇ 10°, an intermediate flow barrier 10 whose opening angle 013 is substantially equal to 124° ⁇ 10°, an internal flow barrier 9 whose opening angle 013 is substantially equal to 124° ⁇ 10°;
  • each of the three secondary magnetic poles 14 preferably comprises an external flow barrier 11 whose opening angle 013 is substantially equal to 124° ⁇ 10°, an intermediate flow barrier 10 whose opening angle 013 is substantially equal to 124° ⁇ 10°, an internal flow barrier 9 whose opening angle 013 is substantially equal to 124° ⁇ 10°.
  • the amplitude of the three flow barriers 9, 10, 11 of each primary and secondary magnetic pole 13, 14 is defined by identifying the opening angles 01, 02, ..., 012, included between two straight lines projected from the theoretical centre C of rotation of the rotor 1 and each passing through a connection point R of the surfaces 31 and 12, substantially parallel to the edge of the sheet metal 3, of each first and third inclined axial cavity 6, 8, respectively with the first and second lateral surfaces 41, 51 of each first inclined axial cavity 6 and with the first and second lateral surfaces 22, 23 of each third inclined axial cavity 8.
  • an internal opening angle 01, 03, 05, 07, 09, 011 is identified, included between two straight lines projected from the centre C of rotation of the rotor 1 and passing through the connection point R of the surfaces 31, 12 substantially parallel to the edge of the sheet metal 3 of each first 6 and third 8 inclined axial cavity, respectively with the second lateral surface 51 of each first inclined axial cavity 6 and with the second lateral surface 23 of each third inclined axial cavity 8, and an external opening angle 02, 04, 06, 08, 010, 012 is also identified, included between two straight lines projected from the centre C of rotation of the rotor 1 and passing through the connection point R of the surfaces 31 , 12 substantially parallel to the edge of the sheet metal 3 of each first 6 and third 8 inclined axial cavity, respectively with the first lateral surface 41 of each first axial cavity 6 inclined and with the first lateral surface 22 of each third axial cavity 8 inclined .
  • the Table 1 below lists the values of the opening angles 01 , 02 , ..., 06 for three primary magnetic poles 13 and the values of the opening angles 07 , 08 , ..., 012 for three secondary magnetic poles 14 of the rotor 1 .
  • the secondary magnetic poles 14 each comprise: an external flow barrier 11 whose external opening angle 08 is between 27° 83' and 31° 83', preferably substantially equal to 29° 83' ; an intermediate flow barrier 10 whose external opening angle 010 is between 42° 95' and 46° 95' , preferably substantially equal to 44° 95' ; an internal flow barrier 9 whose external opening angle 012 is between 57° 11' and 61° 11' , preferably substantially equal to 59° 11' ; the primary magnetic poles 13 each comprise: an external flow barrier 11 whose external opening angle 02 is between 23° 59' and 27° 59' , preferably substantially equal to 25° 59' ; an intermediate flow barrier 10 whose external opening angle 04 is between 34° 94' and 38° 94' , preferably substantially equal to 36° 94' ; an internal flow barrier 9 whose external opening angle 06 is between 49° 47' and 53° 47' , preferably substantially equal to 51° 47' .
  • the secondary magnetic poles 14 each comprise: an external flow barrier 11 whose internal opening angle 07 is between 21° 73' and 25° 73' , preferably substantially equal to 23° 73' ; an intermediate flow barrier 10 whose internal opening angle 09 is between 36° 55' and 40° 55' , preferably substantially equal to 38° 55' ; an internal flow barrier 9 whose internal opening angle 011 is between 50° 65' and 54° 65' , preferably substantially equal to 52° 65' ;
  • the primary magnetic poles 13 each comprise: an external flow barrier 11 whose internal opening angle 01 is between 18° 16' and 22° 16' , preferably substantially equal to 20° 16' ; an intermediate flow barrier 10 whose internal opening angle 03 is between 28° 93' and 32° 93' , preferably substantially equal to 30° 93' ; an internal flow barrier 9 whose internal opening angle 05 is between 43° 86' and 47° 86' , preferably substantially equal to 45° 86' .
  • the radii of connection R between the surface 12 substantially parallel to the edge of the lamination 3 and the first 22 or second lateral surface 23 of each inclined third axial cavity 8 are included within the range 0.2 - 1 mm.
  • the radii of connection R between the first surface 31 substantially parallel to the edge of the lamination 3 and the first 41 or second 51 lateral surface of each inclined first axial cavity 6 are included within the range 0.2 - 1 mm.
  • the rotor 1 comprises primary magnetic poles 13 and secondary magnetic poles 14 arranged alternately with respect to each other.
  • the flow barriers 9, 10, 11 of two consecutive magnetic poles 13, 14 are asymmetrical to each other and this limits , compared to the electrical machines of the prior art , the torque ripple and the harmonics of counter-electromotive force .
  • an electric machine comprises a fixed part , the stator, and a moving part , the rotor, arranged coaxially one inside the other .
  • the rotor is located inside the stator, which comprises electric coils capable of generating a magnetic field that allows the rotor to rotate .
  • the electric machine according to the invention also comprises the rotor 1 described above , and between the rotor 1 and the stator an air gap of thickness between 0 . 5 mm and 1 . 5 mm .
  • the rotor and the electric machine of the invention allow to obtain a better efficiency and better performance with a high "air gap" , which entails greater machining tolerances of the rotor and lower costs .
  • Another advantage of the present invention is to reduce the torque ripple and the harmonics of counter-electromotive force.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un rotor (1) pour une machine électrique comprenant : un arbre rotatif ; un bloc lamellaire fixé sur l'arbre rotatif et comprenant une pluralité de stratifications (3) comportant trois paires de pôles magnétiques primaires (13) et secondaires (14), chaque pôle magnétique comprenant une barrière d'écoulement externe (11), une barrière d'écoulement intermédiaire (10) et une barrière d'écoulement interne (9).
PCT/IT2025/050048 2024-03-13 2025-03-10 Rotor pour machine électrique et machine électrique comprenant un tel rotor Pending WO2025191619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202400005590 2024-03-13
IT102024000005590 2024-03-13

Publications (1)

Publication Number Publication Date
WO2025191619A1 true WO2025191619A1 (fr) 2025-09-18

Family

ID=91248969

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2025/050048 Pending WO2025191619A1 (fr) 2024-03-13 2025-03-10 Rotor pour machine électrique et machine électrique comprenant un tel rotor

Country Status (1)

Country Link
WO (1) WO2025191619A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130147299A1 (en) 2011-12-09 2013-06-13 GM Global Technology Operations LLC Interior permanent magnet machine with pole-to-pole asymmetry of rotor slot placement
US20160365762A1 (en) 2015-06-09 2016-12-15 Ford Global Technologies, Llc Surface Groove Patterns for Permanent Magnet Machine Rotors
US10778054B2 (en) 2015-06-12 2020-09-15 Jaguar Land Rover Limited Electric drive motor
US20230198325A1 (en) 2020-09-25 2023-06-22 Daikin Industries, Ltd. Rotating machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130147299A1 (en) 2011-12-09 2013-06-13 GM Global Technology Operations LLC Interior permanent magnet machine with pole-to-pole asymmetry of rotor slot placement
US20160365762A1 (en) 2015-06-09 2016-12-15 Ford Global Technologies, Llc Surface Groove Patterns for Permanent Magnet Machine Rotors
US10778054B2 (en) 2015-06-12 2020-09-15 Jaguar Land Rover Limited Electric drive motor
US20230198325A1 (en) 2020-09-25 2023-06-22 Daikin Industries, Ltd. Rotating machine

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