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WO2025141386A1 - Rotor pour moteur électrique - Google Patents

Rotor pour moteur électrique Download PDF

Info

Publication number
WO2025141386A1
WO2025141386A1 PCT/IB2024/062694 IB2024062694W WO2025141386A1 WO 2025141386 A1 WO2025141386 A1 WO 2025141386A1 IB 2024062694 W IB2024062694 W IB 2024062694W WO 2025141386 A1 WO2025141386 A1 WO 2025141386A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
housing
housing seats
magnet
rotor assembly
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/IB2024/062694
Other languages
English (en)
Inventor
Alessio MIOTTO
Luca D'URSO
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.)
Brembo SpA
Original Assignee
Brembo 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 Brembo SpA filed Critical Brembo SpA
Publication of WO2025141386A1 publication Critical patent/WO2025141386A1/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
    • H02K1/278—Surface mounted magnets; Inset magnets

Definitions

  • the present invention relates to a rotor for an electric motor, in particular an electric motor with permanent magnets.
  • Electric motors comprising a plurality of permanent magnets associated with a rotor by coupling means, ensuring the connection and positioning of the plurality of permanent magnets with the rotor during actuation of the motor.
  • FIG. 3 is a perspective view of a permanent magnet of an electric motor, according to an embodiment of the invention.
  • the housing seats 8 are open on the second surface 6 and closed on the first surface 5.
  • the rotor body 3 comprises an abutment wall 14 formed at the first surface 5.
  • a rotor 1 thus configured allows inserting the permanent magnet 9 of the respective housing seat 8 through the opening formed, for example, on the second surface 6, along an axial direction parallel to the rotor axis 4, and positioning the permanent magnet 9 to abut against the abutment wall 14.
  • the rotor 1 thus ensures a correct positioning and coupling between the permanent magnet 9 and the housing seat 8, by means of the abutment of the permanent magnet 9, in particular of the coupling body 13, against the abutment wall 14 of the rotor body 3.
  • the rotor body 3 comprises from four to sixteen housing seats 8.
  • the rotor body 3 comprises from six to fourteen housing seats 8.
  • the rotor body 3 comprises from eight to twelve housing seats 8.
  • the rotor body 3 comprises from eight to ten housing seats 8.
  • the housing seats 8 extend through the rotor body 3 along respective axial directions parallel to the rotor axis 4.
  • the magnet body 10 is substantially ingotshaped, having a larger lower base than an opposite upper base, and inclined side walls.
  • the second magnet surface 12 is flat.
  • the second magnet surface 12 is positionable to abut against the outer surface 7 of the rotor body 3.
  • the outer surface 7 comprises at least one backing surface 17 adjacent to a respective housing seat 8.
  • the second magnet surface 12 is positionable to abut against the backing surface 17 of the outer surface 7.
  • each housing seat 8 is formed between two opposite backing surfaces 17. Specifically, each housing seat 8 extends in a radially inner direction with respect to the backing surfaces 17, between two opposite backing surfaces 17.
  • the backing surface 17 is flat. Specifically, the backing surface 17 extends on a plane tangential to the rotor axis 4.
  • the outer surface 7 thus defines a plurality of flat backing surfaces 17, extending on planes tangential to the rotor axis 4, and a plurality of housing seats 8 formed between the flat backing surfaces 17 and extending into the rotor body 3 in the direction radial to the rotor axis 4.
  • the rotor body 3 comprises a plurality of injection holes 15.
  • the injection holes 15 extend from the first surface 5 to the second surface 6, passing through the rotor body 3.
  • the injection holes 15 preferably extend passing through the rotor body 3 along respective axial directions parallel to the rotor axis 4.
  • the injection holes 15 are configured to allow an injection of a filler material or an overmolding fluid therein.
  • the outer surface 7 defines the injection holes 15.
  • the rotor assembly 2 After assembling the permanent magnets 9 to the rotor body 3 by means of an undercut connection, the rotor assembly 2 is positionable inside a mold for an overmolding operation.
  • the overmolding fluid into the rotor 1 thus configured through the injection holes 15 and distribute it in the mold on the permanent magnets 9 and on the rotor body 3, so as to make a rotor housing overmolded on the rotor assembly 2.
  • the rotor assembly 2 is positionable inside a mold for injecting a filler material, through the injection holes 15, for fixing the permanent magnets 9 to the rotor body 3.
  • the injection holes 15 are different from the housing seats 8.
  • the separation between the injection holes 15 and the housing seats 8 simplifies the assembly of the rotor 1 and the subsequent injection of filler material.
  • At least one injection hole 15 is positioned interposed between two housing seats 8.
  • each injection hole 15 is positioned interposed between two housing seats 8.
  • the rotor body 3 thus forms an alternating arrangement of housing seats 8 and injection holes 15.
  • the rotor body 3 comprises a number of injection holes 15 equal to the number of housing seats 8.
  • the injection holes 15 are formed on the outer surface 7 and are open in the direction radial and opposite to the rotor axis 4.
  • the injection holes 15 are formed between two opposite backing surfaces 17.
  • the injection holes 15 extend, in the direction radial to the rotor axis 4, deeper than the housing seats 8.
  • the housing seat 8 forms at least one outer recess, preferably extending in the direction radial to the rotor axis 4, forming the injection hole 15.
  • such configuration is particularly suitable for rotors requiring a greater reduction in size, since the injection hole 15 does not require any additional space on the circumferential portion of the rotor body 3, but is formed as a recess of a respective housing seat 8.
  • the rotor body 3 comprises from six to fourteen injection holes 15.
  • the rotor body 3 comprises from eight to twelve injection holes 15.
  • the rotor body 3 comprises only ten injection holes 15.
  • the injection holes 15 have a cross-section which is substantially circular in shape or shaped like an arc of a circle.
  • the permanent magnets 9 are fixed to the respective housing seats 8 by means of a filler material or an overmolding fluid.
  • the undercut interlock combined with the fixing by means of the filler material or the overmolding fluid ensures a strong and safe connection between permanent magnets 9 and the rotor body 3.
  • the fixing and particularly the injection of filler material for such a fixing can preferably be carried out through the injection holes 15 described above.
  • the permanent magnets 9 are glued inside the respective housings 8.
  • the undercut interlock combined with gluing ensures a strong and safe connection between permanent magnets 9 and the rotor body 3.
  • the rotor assembly 2 comprises an annular component or a tubular containment component positioned circularly outside the permanent magnets 9 and configured to tighten and fix the permanent magnets 9 inside the housing seats 8.
  • the annular component or tubular component is made of a different material from that of the permanent magnets 9, it is preferably made of a paramagnetic material, e.g., aluminum.
  • the annular component or the tubular component can be made of different materials, by way of example it is made as a heat shrink tube or of a composite material or of a fiber reinforced material (e.g., fiberglass) or stainless steel.
  • the undercut interlock combined with binding by means of the annular or tubular containment component ensures a strong and safe connection between permanent magnets 9 and the rotor body 3.
  • the permanent magnets 9 are fixed inside the respective housing seats 8 by both by gluing and binding.
  • the rotor body 3 is laminated. Specifically, the rotor body 3 consists of a stack of ferromagnetic foils stacked along an axial direction parallel to the rotor axis 4. A first foil and an opposite last foil preferably define the first surface 5 and the opposite second surface 6.
  • the rotor body 3 comprises an axial hole, extending through the rotor body 3 between the first surface 5 and the second surface 6, at the rotor axis 4.
  • the rotor 1 further comprises a rotor shaft 16 inserted into the axial hole and positioned coaxial to the rotor axis 4 and fixed to the rotor body 3.
  • the electric motor comprises a rotor housing overmolded on the rotor assembly 2.
  • the rotor housing is made of a polymer material.

Landscapes

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

Abstract

L'invention concerne un ensemble rotor (2) pour un moteur électrique, comprenant un rotor (1) comprenant un corps de rotor (3) s'étendant autour d'un axe de rotor (4), le corps de rotor (3) comprenant une première surface (5), transversale à l'axe de rotor (4) ; une seconde surface (6), transversale à l'axe de rotor (4) et opposée à la première surface (5) ; une surface externe (7) s'étendant autour de l'axe de rotor (4), de préférence coaxiale à l'axe de rotor (4), de la première surface (5) à la seconde surface (6), l'ensemble rotor (2) comprenant une pluralité d'aimants permanents (9), le corps de rotor (3) comprenant une pluralité de logements (8), pour loger une pluralité d'aimants permanents (9), les logements (8) étant formés pour réaliser une connexion en contre-dépouille avec les aimants permanents (9) dans la direction radiale par rapport à l'axe de rotor (4), et les logements (8) étant formés sur la surface externe (7), et étant ouverts dans la direction radiale et opposée à l'axe de rotor (4).
PCT/IB2024/062694 2023-12-27 2024-12-16 Rotor pour moteur électrique Pending WO2025141386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102023000028056 2023-12-27
IT202300028056 2023-12-27

Publications (1)

Publication Number Publication Date
WO2025141386A1 true WO2025141386A1 (fr) 2025-07-03

Family

ID=90057320

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2024/062694 Pending WO2025141386A1 (fr) 2023-12-27 2024-12-16 Rotor pour moteur électrique

Country Status (1)

Country Link
WO (1) WO2025141386A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69510363T2 (de) * 1994-10-14 1999-10-14 Honda Giken Kogyo K.K. Rotor für rotierende maschine, verfahren zu seiner herstellung und magneteinheit
CN103534911A (zh) * 2011-05-11 2014-01-22 阿尔斯通可再生能源西班牙有限公司 发电机转子、装配方法以及相关的插入工具
DE102013211858A1 (de) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Oberflächen- Magnete und vergrabene Magnete für einen Rotor oder Stator einer elektrischen Maschine, der eine Haltegeometrie aufweist
US20190165625A1 (en) * 2016-08-03 2019-05-30 Feaam Gmbh Rotor for an electric machine and electric machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69510363T2 (de) * 1994-10-14 1999-10-14 Honda Giken Kogyo K.K. Rotor für rotierende maschine, verfahren zu seiner herstellung und magneteinheit
CN103534911A (zh) * 2011-05-11 2014-01-22 阿尔斯通可再生能源西班牙有限公司 发电机转子、装配方法以及相关的插入工具
DE102013211858A1 (de) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Oberflächen- Magnete und vergrabene Magnete für einen Rotor oder Stator einer elektrischen Maschine, der eine Haltegeometrie aufweist
US20190165625A1 (en) * 2016-08-03 2019-05-30 Feaam Gmbh Rotor for an electric machine and electric machine

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