WO2018162072A1 - Permanent magnet axial-flux electric machine with auxiliary winding arrangement - Google Patents

Permanent magnet axial-flux electric machine with auxiliary winding arrangement Download PDF

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Publication number
WO2018162072A1
WO2018162072A1 PCT/EP2017/055665 EP2017055665W WO2018162072A1 WO 2018162072 A1 WO2018162072 A1 WO 2018162072A1 EP 2017055665 W EP2017055665 W EP 2017055665W WO 2018162072 A1 WO2018162072 A1 WO 2018162072A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
electric machine
yoke
windings
flux electric
Prior art date
Application number
PCT/EP2017/055665
Other languages
English (en)
French (fr)
Inventor
Yasemin ERTUGRUL
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to PCT/EP2017/055665 priority Critical patent/WO2018162072A1/en
Priority to TR2018/01413A priority patent/TR201801413A2/tr
Publication of WO2018162072A1 publication Critical patent/WO2018162072A1/en

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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
    • H02K1/2793—Rotors axially facing stators
    • H02K1/2795—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2798—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets where both axial sides of the stator face a rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/18—Windings for salient poles
    • H02K3/20—Windings for salient poles for auxiliary purposes, e.g. damping or commutating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to permanent magnet axial-flux electric machine with an auxiliary winding arrangement.
  • PMSM permanent-magnet synchronous motors
  • SMC Soft Magnetic Composite
  • axial flux motors have become common in a wider range of applications due to advances in material science.
  • Axial flux permanent magnet machines have their distinct advantages over radial flux permanent magnet machines in that they require less core material due to higher power-to-weight ratio and as a result of the disc shaped rotor and stator structure, smaller size is ensured.
  • axial flux motors have high power and torque density (W/m 3 , Nm/m 3 ). As high output power can be obtained with small motor sizes, axial flux type motors are being used more and more, especially in applications such as electric cars, bikes and wind turbines.
  • Output power of axial flux motors is proportional to the cube of the outside radius of the motor. Its axial length is limited by the windings around the stator coils. If the number of windings can be kept limited, the axial length of the motor will be minimized. However, if the number of windings is not sufficient, the axial length of the motor must be increased to obtain the number of windings necessary.
  • a prior art publication in the technical field of the invention may be referred to as US2008061649, which discloses an axial gap motor in which a stator and a rotor are arranged parallel to a rotating shaft. More particularly, the publication discloses an axial gap motor, which can be easily manufactured and achieve an improvement in efficiency.
  • the stator includes a back yoke defining a magnetic path, a plurality of stator cores each having a central portion parallel to the rotating shaft, each of the plurality of stator cores being coupled to the back yoke, and a plurality of stator coils, each wound around the central portion of a corresponding one of the stator cores.
  • WO2014087389 discloses coils for axial flux permanent magnet motors where the coils are made up of coil elements of lap type with slots where the coil element is manufactured by casting, or a combination off milling or punching and water cutting or wire cutting or similar. It is also made slots for the connector which connects each coil element.
  • the publication additionally discloses coils for three phased axial flux permanent magnet motors where the coils are of wave winding type and manufactured by casting, or a combination of milling or punching and water cutting or wire cutting.
  • the first phase of the coils can be made up of a single coil element or assembled from smaller parts and have slots which all face up when placed on the assembly table.
  • slots are arranged so that the slots fit together with the slots that are facing down in the second coil element which has slots on both sides.
  • the slots in the second element which face up together with the slots in the first coil element which are not filled by slots in the second coil element are arranged so that they are filled with the slots in the third coil element which only has slots facing down and can be identical with the first coil element.
  • Other examples may be referred to as US20140285048, US20130307366 and US20120212085.
  • the present invention addresses the situation where auxiliary windings are used in addition to windings of the stator coils whereby the number of windings on the stator coils can be decreased. In this manner, the axial length of the motor can be shortened and the motor has a more compact structure.
  • the present invention provides permanent magnet axial-flux electric machine with auxiliary windings as provided by the characterizing features defined in Claim 1.
  • Primary object of the present invention is to provide a permanent magnet axial-flux electric machine having a shortened axial length.
  • the present invention proposes an axial flux electric machine comprising a stator assembly and a rotor assembly.
  • a plurality of symmetrically disposed toroidal windings in the form of auxiliary windings are distributed on the stator yoke to at least partially radially extend through planar sides of said stator yoke between each pair of stator coils.
  • Fig. 1 demonstrates a perspective view of a conventional axial flux electric machine with stator and rotor assemblies.
  • Fig. 2 demonstrates a perspective view of the stator assembly with the stator yoke and stator teeth in assembled condition according to the present invention.
  • Fig. 3 demonstrates a perspective view of the axial flux electric machine with stator and rotor assemblies and auxiliary stator windings according to the present invention.
  • Fig. 4 demonstrates a side view of the axial flux electric machine with stator and rotor assemblies and auxiliary stator windings according to the present invention.
  • the present invention relates to permanent magnet (8) axial-flux electric machine (1) conventionally having stator and rotor assemblies (2 and 3).
  • Permanent magnets (8) are attached to the rotor yoke (7). Both of the stator and rotor yokes (6, 7) are conventionally assembled with stator teeth (4) carrying stator coils (5) generating axial flux. Stator teeth (4) can be preferably formed separately to be attached to the yoke. Permanent magnets (8) can be fixedly attached on the rotor yoke (7) through respective projections (not shown). Preferably, stator teeth (4) can be manufactured using insulated pure iron powder (Soft Magnetic Composite (SMC) material) and can be wound separately to be attached to the stator yoke (6) also through respective projections (not shown). SMC material and ferromagnetic sheet lamination can be used in combination to obtain stator and rotor assemblies (2 and 3).
  • SMC Soft Magnetic Composite
  • toroidal windings in the form of auxiliary windings (9) are added to the stator yoke (6) structure so as to be disposed between each pair of stator coil (5).
  • Auxiliary windings (9) at least partially radially extending through both planar sides of the stator yoke (6) are typically supported thereon in a secured manner.
  • Auxiliary windings (9) are wound on coils in three phases on the stator.
  • ampere-turns of the system need to be sufficient.
  • the current or the number of windings must be increased. Increasing the current increases motor losses and decreases the efficiency of the motor.
  • increasing the number of windings is not always suitable as in these cases it is necessary to increase the length of the stator teeth (4) and to increase the outer axial dimension of the motor.
  • the invention provides additional winding area by placing windings on the yoke between the coils.
  • auxiliary windings (9) are not placed in the axial direction, their contribution is not as much as windings wound around the stator teeth (4).
  • these auxiliary windings (9) yet produce a discernible effect, namely by increasing the output power or the efficiency of the axial flux electric machine (1).
  • the present invention proposes an axial flux electric machine (1) comprising a stator assembly (2) and a rotor assembly (3), said stator assembly (2) having a stator yoke (6) and stator teeth (4) with windings wound around said stator teeth (4), said rotor assembly (3) having a rotor yoke (7) and a plurality of permanent magnets (8), each one disposed at a different relative position on said rotor yoke (7).
  • a plurality of symmetrically distributed toroidal windings in the form of auxiliary windings (9) are disposed on the stator yoke (6) in the manner that each of said auxiliary windings (9) fully encloses a radial extension of said stator yoke (6).
  • each of said toroidal windings in the form of auxiliary windings (9) are disposed between each pair of stator coil (5).
  • said auxiliary windings (9) at least partially radially extend through both planar sides of the stator yoke (6) in the manner to be supported in a secured manner.
  • each of stator and rotor yokes (6, 7) is made of laminated sheets.
  • stator teeth (4) are manufactured using soft magnetic composite materials, wound in an unassembled condition with the stator yoke (6) and then attached to the stator yoke (6).
  • stator teeth (4) and permanent magnets (8) comprise slots on their bottom surface for attachment with respective projections of the stator and rotor yokes (6, 7).
  • toroidal windings in the form of auxiliary windings (9) are fixedly attached to the stator yoke (6) and held in place by clipping means (not shown) projecting from said stator yoke (6).
  • the present invention provides that an axial flux motor occupying less axial space can be designed with the help of auxiliary windings (9) without compromising motor performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
PCT/EP2017/055665 2017-03-10 2017-03-10 Permanent magnet axial-flux electric machine with auxiliary winding arrangement WO2018162072A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2017/055665 WO2018162072A1 (en) 2017-03-10 2017-03-10 Permanent magnet axial-flux electric machine with auxiliary winding arrangement
TR2018/01413A TR201801413A2 (enrdf_load_stackoverflow) 2017-03-10 2018-02-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/055665 WO2018162072A1 (en) 2017-03-10 2017-03-10 Permanent magnet axial-flux electric machine with auxiliary winding arrangement

Publications (1)

Publication Number Publication Date
WO2018162072A1 true WO2018162072A1 (en) 2018-09-13

Family

ID=58410256

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/055665 WO2018162072A1 (en) 2017-03-10 2017-03-10 Permanent magnet axial-flux electric machine with auxiliary winding arrangement

Country Status (2)

Country Link
TR (1) TR201801413A2 (enrdf_load_stackoverflow)
WO (1) WO2018162072A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114600342A (zh) * 2019-10-31 2022-06-07 罗伯特·博世有限公司 用于电加工器具的轴向磁通机以及具有轴向磁通机的电加工器具
WO2024178415A3 (en) * 2023-02-24 2024-11-07 Persimmon Technologies Corporation Three-dimensional-flux electric motor and method for making thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1418657A1 (en) * 2001-07-31 2004-05-12 Yamaha Hatsudoki Kabushiki Kaisha Rotary electric machine
US20080061649A1 (en) 2006-09-08 2008-03-13 Lg Electronics Inc. Axial gap motor and method for manufacturing the same
EP1593190B1 (fr) * 2003-02-12 2008-07-16 Seb S.A. Stator pour moteur electrique a flux axial
US20120212085A1 (en) 2011-02-17 2012-08-23 The Hong Kong Polytechnic University Axial-flux electric machine
US20130307366A1 (en) 2011-01-25 2013-11-21 Coriolis Power Systems Ltd. Axial-flux electric machine
WO2014087389A1 (en) 2012-12-03 2014-06-12 Greenway Energy As Coil for axial flux pm-motor
US20140285048A1 (en) 2013-03-20 2014-09-25 Korea Electronics Technology Institute Redial and axial flux motor using integrated windings
US20150171674A1 (en) * 2013-10-27 2015-06-18 Moovee Innovations Inc. Software-defined electric motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1418657A1 (en) * 2001-07-31 2004-05-12 Yamaha Hatsudoki Kabushiki Kaisha Rotary electric machine
EP1593190B1 (fr) * 2003-02-12 2008-07-16 Seb S.A. Stator pour moteur electrique a flux axial
US20080061649A1 (en) 2006-09-08 2008-03-13 Lg Electronics Inc. Axial gap motor and method for manufacturing the same
US20130307366A1 (en) 2011-01-25 2013-11-21 Coriolis Power Systems Ltd. Axial-flux electric machine
US20120212085A1 (en) 2011-02-17 2012-08-23 The Hong Kong Polytechnic University Axial-flux electric machine
WO2014087389A1 (en) 2012-12-03 2014-06-12 Greenway Energy As Coil for axial flux pm-motor
US20140285048A1 (en) 2013-03-20 2014-09-25 Korea Electronics Technology Institute Redial and axial flux motor using integrated windings
US20150171674A1 (en) * 2013-10-27 2015-06-18 Moovee Innovations Inc. Software-defined electric motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114600342A (zh) * 2019-10-31 2022-06-07 罗伯特·博世有限公司 用于电加工器具的轴向磁通机以及具有轴向磁通机的电加工器具
WO2024178415A3 (en) * 2023-02-24 2024-11-07 Persimmon Technologies Corporation Three-dimensional-flux electric motor and method for making thereof

Also Published As

Publication number Publication date
TR201801413A2 (enrdf_load_stackoverflow) 2018-09-21

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