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WO2020260565A1 - Rotor pour une machine électrique à excitation permanente - Google Patents

Rotor pour une machine électrique à excitation permanente Download PDF

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Publication number
WO2020260565A1
WO2020260565A1 PCT/EP2020/067999 EP2020067999W WO2020260565A1 WO 2020260565 A1 WO2020260565 A1 WO 2020260565A1 EP 2020067999 W EP2020067999 W EP 2020067999W WO 2020260565 A1 WO2020260565 A1 WO 2020260565A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
web
pockets
permanent magnets
pocket
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/EP2020/067999
Other languages
German (de)
English (en)
Inventor
Philipp NEIDHARDT
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 WO2020260565A1 publication Critical patent/WO2020260565A1/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
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle

Definitions

  • the invention relates to a rotor for a permanently excited electrical machine.
  • the exemplary embodiments can relate to permanently excited electrical machines for driving a motor vehicle.
  • Permanently excited electrical machines which can be used, for example, to drive motor vehicles, typically have a stator and a rotatably mounted rotor.
  • the rotor has, for example, a plurality of pockets which serve as receptacles for permanent magnets.
  • the stator can generate a variable magnetic field in order to drive the rotor, and thus the motor vehicle.
  • the rotor can reach speeds of over 7000 revolutions per minute during operation.
  • Components arranged in the rotor, in particular the permanent magnets, are therefore subject to centrifugal forces and electromagnetic forces, for example.
  • Web of the rotor, which spaced apart pockets arranged next to one another, and the permanent magnets arranged in the pockets can thereby be exposed to mechanical loads.
  • a maximum speed of the rotor can therefore be limited, for example, due to a maximum mechanical load capacity of the webs.
  • the present invention relates to a rotor for a permanently excited electrical machine.
  • the rotor has several pockets to accommodate permanent magnets. At least one first and at least one second pocket are each arranged on opposite sides of a first web.
  • the first web has at least one recess.
  • the permanently excited electrical machine can be designed as a so-called internal or external rotor, for example.
  • the rotor In the case of the external rotor, the rotor is arranged, for example, radially outside a stator and in the case of the internal rotor, it is arranged radially inside the stator.
  • the rotor therefore comprises, for example, a cylindrical hollow body, and in the case of the internal rotor, a solid, cylindrical body.
  • the rotor can, for example, be rotatably mounted and for driving a motor vehicle, for example, can be connected in a rotationally fixed manner to a drive shaft of the motor vehicle.
  • Permanent magnets which are arranged, for example, in the pockets of the rotor, can interact with an alternating magnetic field generated by the stator in such a way that the rotor can be driven thereby.
  • To support the permanent magnets against centrifugal forces occurring for example, recesses made in the rotor, which extend axially through the rotor, can be designed as pockets.
  • the permanent magnets can be cohesively, positively and / or non-positively arranged in the pockets.
  • the pockets can be designed in such a way that the permanent magnets can be clamped and / or glued therein or welded to the rotor.
  • the first and second pockets are introduced into the rotor in such a way that the first web is formed, which is arranged between the first and second pocket.
  • the first and second pockets can thus be spaced from one another, for example by a first web.
  • a magnetic short circuit of the permanent magnets arranged, for example, in the first and second pockets can be prevented by a distance between the first and second pockets.
  • the first web Due to the at least one recess made in the first web, which forms a “flow barrier” there, a cross section of the first web can be reduced. In this way, for example, a magnetic flux between the permanent magnets arranged in the first and second pockets can be reduced at least locally. As a result, the first web can be made shorter than webs of conventional rotors. This results in, for example, a higher mechanical load-bearing capacity of the first web than conventional rotors.
  • the first and second pockets can each be arranged on opposite sides of the first web in the circumferential direction.
  • the first web can thus run radially, for example.
  • the north pole or the south pole can be aligned with the stator.
  • the first and the second pocket can be arranged axially symmetrically to a radial direction of the rotor.
  • the first and second pocket can be arranged, for example, as a “V” which, when the permanently excited electrical machine is designed as an internal rotor, is “open” radially outward, for example.
  • the first and second pockets can be spaced apart by the first web.
  • the first web can, for example, run along an axis of symmetry, around which the first and second pockets can be arranged axially symmetrically to one another.
  • Such a “V” -shaped arrangement of the first and second pockets, or the permanent magnets arranged therein, has proven to be advantageous in order, for example, to achieve a maximum power density of the permanently excited electrical machine.
  • the south pole of the permanent magnets can, for example, be oriented radially outward towards the stator.
  • the permanent magnets whose poles can have a reversed polarity.
  • the recess can have a smaller extent in the radial direction than the first web.
  • the first web has a locally minimal cross section, for example. As already mentioned, this allows the magnetic flux to be reduced compared to a web without a recess.
  • the mechanical strength of the first web can decrease, for example with regard to a twist or deformation of the first web. It can therefore be advantageous to design the recess in such a way that the extension of the recess in the radial direction is less than a radial extension of the first web.
  • the first web can have two recesses.
  • the two recesses can be arranged next to one another in the circumferential direction.
  • the rotor can have a third and a fourth pocket, which are arranged on opposite sides of a second web, the second web having at least one recess.
  • the third and fourth pockets can be placed in the rotor for this purpose.
  • the third and fourth pockets can for example be arranged radially outside the first and second pockets.
  • the third and fourth pockets can, for example, be arranged in a “V” shape, similar to the first and second pockets.
  • exemplary embodiments of the present invention relate to an alternative design of a rotor for a permanently excited electrical machine.
  • the rotor has at least a first pair of adjacent pockets which are each arranged on opposite sides of a web running parallel to an edge of the adjacent pockets.
  • the web extends in at least one direction further than a significant width of the adjacent pockets in this direction.
  • the adjacent pockets can, for example, be arranged next to one another in relation to a plane of rotation of the rotor.
  • the pockets can also be arranged next to one another perpendicular to the alignment of a polarity of the permanent magnets.
  • the adjacent pockets can be placed in the rotor at a distance from one another, so that the web is formed between the adjacent pockets and thus spaced the adjacent pockets from one another. It has proven to be advantageous to design the pockets in such a way that the, for example, qua der-shaped permanent magnets can be positively clamped in the pockets or pressed into them.
  • the significant width of the adjacent pockets can, for example, indicate an extension of the permanent magnets arranged in these pockets along the alignment of the polarity. For a jamming of the permanent magnets in the adjacent pockets, a nominal dimension of the signi ficant width of this extension of the permanent magnets can correspond.
  • the pockets can each have an incision which extends in the direction of the significant width compared to this extends further.
  • the web can in this direction, for example, have a greater extent than the permanent magnets arranged in the adjacent pockets.
  • the incisions can thus serve as flux barriers, for example, in order to reduce a magnetic flux that flows over the web. As a result, a magnetic short circuit of the permanent magnets arranged in the adjacent pockets can be prevented.
  • the web can extend further inward in the radial direction than the significant width of the neighboring pockets.
  • the rotor can have a second pair of adjacent pockets, which are arranged on opposite sides of a further web which runs parallel to an edge of the adjacent pockets.
  • the further web can extend further inward in the radial direction than the significant width of the pockets of the second pair.
  • the rotor can include further permanent magnets and further pockets, which can be arranged, for example, as a second pair of adjacent pockets.
  • the further web formed by introducing the second pair of adjacent pockets can conceptually correspond to the web formed by the first pair.
  • the further web can also extend radially further inward than the significant width of the pockets of the second pair in order to To reduce the netic flow of the permanent magnets arranged in the adjacent pockets of the second pair.
  • exemplary embodiments of the present invention relate to a permanently excited electrical machine which comprises a stator and a rotor which is arranged in an effective area of the stator and has, for example, features which have been described above.
  • the permanently excited electrical machine comprises permanent magnets which are arranged in the pockets of the rotor.
  • the permanently excited electrical machine can, for example, be the internal rotor or external rotor, which can be used, for example, to drive the motor vehicle.
  • the effective area corresponds, for example, to an area which is penetrated by the changing magnetic field when the stator is in operation.
  • the area of action is, for example, radially inside the stator and, in the case of an external rotor, it is radially outside the stator.
  • the magnetic flux within the rotor can be increased.
  • pockets of the rotor arranged next to one another or the webs encompassed by the rotor for local reduction of the magnetic flux can be designed as described above.
  • a segment of a rotor of a permanently excited electrical Ma machine is shown.
  • the electric machine is intended to drive an electric or hybrid vehicle, the rotor being driven by a changing magnetic field of a stator.
  • the rotor can reach speeds of over 7000 revolutions per minute.
  • 1 shows in particular a segment 102 of a rotor 100 which, for example, can be arranged radially inside a stator (not shown here) of an internal rotor.
  • the rotor 100 can comprise a stack of sheet-metal laminations stacked in the axial direction.
  • the rotor 100 can, for example, be divided into eight identical segments 102.
  • One of the segments 102 has, for example, a first pocket 120-1, a second pocket 120-2, a third pocket 120-3 and a fourth pocket 120-4 for receiving a permanent magnet 110 in each case.
  • the pockets 120-1, 120-2, 120-3 and 120-4 can be recesses, for example, which extend axially through the rotor 100.
  • the radially inner pockets 120-1 and 120-2 in pairs, or the radially outer pockets 120-3 and 120-4 can, as shown here, each be arranged in a “V-shape” to one another.
  • the pockets 120-1, 120-2, 120-3 and 120-4 can, as shown here, be arranged in pairs on opposite sides in the circumferential direction of a first web 130-1 or a second web.
  • the second web 130-2 is here, for example, radially outside the first web 130-1.
  • Projections 134 of the pockets 120-1, 120-2, 120-3 and 120-4 can serve as flux barriers and thus reduce a magnetic flux to prevent a magnetic short circuit.
  • a radial length of the first and second webs 130-1 and 130-2, as shown here, can be determined by a radial extension of the extensions 134.
  • the first web 130-1 has two recesses 132-1 and the second web 130-2 has one, due to a limited installation space single recess 132-2.
  • the first web 130-1 and / or the second web 130-2 can each have any number of recesses 130-1 and / or 130-2.
  • the recesses 132-1 and 132-2 serve, for example, as flow barriers.
  • the recesses 132-1 and 132-2 can, for example, cause magnetic leakage flux to reduce the magnetic flux and thereby prevent the magnetic short circuit.
  • a cross section of the webs 130-1 and 130-2 which can be tapered at least locally due to the recesses 132-1 and 132-2, can increase a magnetic resistance in order to additionally reduce the magnetic flux between the permanent magnets 110 .
  • a first aspect with regard to a design of the recesses 132-1 and 132-2 relates to the reduction of the magnetic flux within the webs 130-1 and 130-2.
  • the reduction in the magnetic flux is more proportional to a reduction in the cross section of the webs 130-1 and 130-2 than from a radial extension of the recesses 132- 1 and 132-2 depends.
  • a second aspect with regard to the design of the recesses 132-1 and 132-2 relates to dimensional stability and / or the mechanical load-bearing capacity of the webs 130-1 and 130-2.
  • the dimensional stability and / or the mechanical loading capacity of the webs 130-1 and 130-2 it has been shown that the dimensional stability and / or the mechanical loading capacity of the webs 130-1 and 130-2 with an increasing proportion of the recesses 132-1 and 132-2 can decrease relative to webs 130-1 and 130-2. Due to a moment of inertia that increases with a radial distance, the effect of centrifugal force on the second web 130-2 can be higher than on the first web 130-1.
  • the recesses 132-1 according to the configuration shown in FIG 1. Execute the exemplary embodiment shown.
  • the openings are gen 132-1 designed so that a radial extension of the recesses 132-1 is less than the radial length of the first web 130-1. This results, for example, in a smaller proportion of the recesses 132-1 on the first web 130-1 compared to the recesses 132-2 and thus a higher dimensional stability and / or higher mechanical strength for the first web 130- compared to the second web 130-2 1.
  • the recesses 132-1 of the first web 130-1 can be introduced in a radially outer region of the first web 130-1, as in the embodiment shown in FIG. 1, in order, for example, to reduce a mass of the outer region. As a result, a centrifugal force acting on the outer area can be reduced. A radially outwardly directed force component which occurs as a result and which acts on an inner region of the first web 130-1 can thus be reduced. This can contribute to increasing the mechanical strength of the first web 130-1.
  • the effect of centrifugal force on the second web 130-2 can be less than on the first web 130-1.
  • the second web 130-2 can therefore be designed in such a way that its mechanical strength is lower than that of the first web 130-1.
  • a radial extension and an associated portion of the recess 132-2 on the second web 130-2 can therefore be larger than that of the recesses 132-2. Due to the larger design of the recess 132-2, the magnetic flux within the second web 132-2 can, for example, be reduced more than within the first web 130-1.
  • the rotor 100 can thus, for example, be adapted to a maximum torque, the maximum speed and / or the maximum magnetic flux of a further permanently excited electrical machine.
  • the rotor 100, or the segment 102 of the rotor 100 can have at least a first and / or second pair of adjacent pockets for receiving permanent magnets.
  • the first and / or second pair can comprise, for example, the first pocket 120-1 or the second pocket 120-2 and a further pocket 120-5, or the pocket 120-6.
  • Further exemplary embodiments can each provide a first and / or second pair, which provides a different combination of pockets, which for example includes neither the first pocket 120-1 nor the second pocket 120-2.
  • the adjacent pockets 120-1 and 120-5 or 120-2 and 120-6 shown in FIG. 1 each have an incision 136 on mutually arranged sides. These incisions 136 extend parallel to the web 130-3 further than a significant width 138 of the pockets 120-1, 120-2, 120-5 and 120-6 which are adjacent in pairs.
  • the significant width 138 can, for example, correspond to a nominal dimension of the permanent magnets 110 arranged in these pockets 120-1, 120-2, 120-5 and 120-6, so that the permanent magnets 110 can be clamped and / or further positively engaged and / or cohesive connections (for example by means of press fit, gluing and / or by welding) can be arranged in the pockets 120-1, 120-2, 120-5 and 120-6 which are adjacent in pairs.
  • webs 130-3 and 130-4 can be formed, as shown in FIG. 1.
  • the webs 130-3 and 130-4 extend parallel to the incisions 136.
  • the webs 130-3 and 130-4 extend further into an area outside of the pockets 120-1, 120- which are arranged in a "V-shape". 2, 120-5 and 120-6 spanned area. It follows implicitly from this that the webs 130-3 and 130-4 each extend radially further inward than the significant width 138 of the pockets 120-1, 120-2, 120-5 and 120-6 that are adjacent in pairs.
  • a centrifugal force acting on the webs 130-3 and 130-4 can be lower than with a radially outward extension of the webs 130-3 and 130 -4.
  • the incisions 136 can serve as flux barriers to reduce the magnetic flux outside of the “v-shaped” arrangement of the adjacent pockets 120-1, 120-2, 120-5 and 120-6 to prevent the magnetic short circuit.
  • the above-described shape of the adjacent pockets 120-1, 120-2, 120-5 and 120-6 implicitly results in the mutually arranged edges of the permanent magnets 110 at a radially outer end of the webs 130-3 and 130-4 are arranged.
  • the recesses 140 extend, for example, axially through the rotor 100 or through the rotor segment 102. These serve, for example, on the one hand to reduce a mass of the rotor 100 in a circumferential area, for example to reduce the moment of inertia in favor of a higher power density of the rotor 100. On the other hand, the recesses 140 serve to reduce a mechanical load acting on the webs 130-1, 130-2, 130-3 and 130-4 at speeds up to the maximum speed.

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

Abstract

L'invention concerne un rotor (100) pour une machine électrique à excitation permanente, lequel possède plusieurs poches (120-1,120-2,120-3,120-4,120-5,120-6) destinées à accueillir des aimants permanents (110). Au moins une première et au moins une deuxième poche (120-1, 120-2) sont respectivement disposées sur les côtés opposés d'un premier élément jointif (130-1), qui possède au moins un évidement (132-1).
PCT/EP2020/067999 2019-06-26 2020-06-26 Rotor pour une machine électrique à excitation permanente Ceased WO2020260565A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019209202.0A DE102019209202A1 (de) 2019-06-26 2019-06-26 Rotor für eine permanenterregte elektrische Maschine
DE102019209202.0 2019-06-26

Publications (1)

Publication Number Publication Date
WO2020260565A1 true WO2020260565A1 (fr) 2020-12-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/067999 Ceased WO2020260565A1 (fr) 2019-06-26 2020-06-26 Rotor pour une machine électrique à excitation permanente

Country Status (2)

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DE (1) DE102019209202A1 (fr)
WO (1) WO2020260565A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023206508B3 (de) * 2023-07-10 2024-12-19 Magna powertrain gmbh & co kg Rotor einer permanentmagneterregten elektrischen Maschine
DE102024205692A1 (de) * 2024-06-20 2025-07-17 Zf Friedrichshafen Ag Metallscheibe und Rotorelement für eine Rotor einer elektrischen Maschine, und Verfahren zum Betreiben eines Rotors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090140592A1 (en) * 2007-11-30 2009-06-04 Gm Global Technology Operations, Inc. Methods and apparatus for a permanent magnet machine with an added air barrier
US20120200188A1 (en) * 2011-02-03 2012-08-09 Toyota Jidosha Kabushiki Kaisha Rotor for rotary electric machine
JP2013126330A (ja) * 2011-12-15 2013-06-24 Toyota Boshoku Corp 回転電機のコア及びその組み付け方法
US20130249342A1 (en) * 2012-03-20 2013-09-26 Kollmorgen Corporation Cantilevered Rotor Magnet Support

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206283343U (zh) * 2016-12-22 2017-06-27 温岭市九洲电机制造有限公司 一种永磁电机转子的冲片

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090140592A1 (en) * 2007-11-30 2009-06-04 Gm Global Technology Operations, Inc. Methods and apparatus for a permanent magnet machine with an added air barrier
US20120200188A1 (en) * 2011-02-03 2012-08-09 Toyota Jidosha Kabushiki Kaisha Rotor for rotary electric machine
JP2013126330A (ja) * 2011-12-15 2013-06-24 Toyota Boshoku Corp 回転電機のコア及びその組み付け方法
US20130249342A1 (en) * 2012-03-20 2013-09-26 Kollmorgen Corporation Cantilevered Rotor Magnet Support

Also Published As

Publication number Publication date
DE102019209202A1 (de) 2020-12-31

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