EP3084937A2 - Moteur à réluctance synchrone perfectionné assisté par des aimants permanents - Google Patents

Moteur à réluctance synchrone perfectionné assisté par des aimants permanents

Info

Publication number
EP3084937A2
EP3084937A2 EP14830671.5A EP14830671A EP3084937A2 EP 3084937 A2 EP3084937 A2 EP 3084937A2 EP 14830671 A EP14830671 A EP 14830671A EP 3084937 A2 EP3084937 A2 EP 3084937A2
Authority
EP
European Patent Office
Prior art keywords
reluctance motor
permanent magnet
synchronous reluctance
rotor
assisted synchronous
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.)
Withdrawn
Application number
EP14830671.5A
Other languages
German (de)
English (en)
Inventor
Ezio Bertotto
Boris Karuzic
Davor Filipeti
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.)
ENERDRIVE LIMITED
Original Assignee
Drives And Motors d o o
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 Drives And Motors d o o filed Critical Drives And Motors d o o
Publication of EP3084937A2 publication Critical patent/EP3084937A2/fr
Withdrawn legal-status Critical Current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]
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors

Definitions

  • the present invention refers to a permanent magnet-assisted synchronous reluctance motor with high performance.
  • the present invention refers to a permanent magnet-assisted synchronous reluctance motor of the optimised type with respect to conventional types of synchronous reluctance motors.
  • permanent magnet-assisted synchronous reluctance motors comprise a stator element, equipped with electrical windings defining pairs of poles, inside which, separated by a space called gap, there is a rotor that is suitable for being set in rotation around an axis.
  • the rotor which is substantially cylindrical, comprises permanent magnets.
  • the permanent magnets can be positioned at the external cylindrical surface of the rotor or inside it, in special seats.
  • the rotor does not have windings and has flux guides, i.e. minimum reluctance portions.
  • the rotor follows, in a "synchronous" manner, the rotation of the inductor magnetic field, set by a current that is suitably controlled through the stator windings, thanks to the preferential channelling of the magnetic flux along the portions of minimum reluctance of the rotor itself.
  • the number of poles, the amount and/or the type of the materials of the permanent magnets can vary.
  • the dimensions of the synchronous reluctance motor can vary, just like the production costs thereof can also vary.
  • ferrite also known as alpha-ferrite (a-Fe) or so-called “rare earths” Neodymium-Iron-Boron (NdFeB).
  • a permanent magnet that is made with "rare earths" for the same dimensions has a magnetic power that is greater with respect to a magnet that is made in ferrite.
  • the dimensions of the permanent magnets are greater, thus determining a possible increase in the overall dimensions of the rotor and, consequently, an increase in the dimensions of the synchronous reluctance motor.
  • a limitation in the use of rare earths for making the permanent magnets lies in the high procurement cost of the base material which, on average, is greater than that of ferrite by at least one order of magnitude.
  • the synchronous reluctance motors can be used in different applications, including applications in which it is foreseen to use partial load motors.
  • One purpose of the present invention is to improve the state of the art.
  • Another purpose of the present invention is to provide a permanent magnet- assisted synchronous reluctance motor with high performance with particular reference to partial load uses.
  • a further purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor with low production costs with respect to those of conventional types of synchronous motors.
  • Another purpose of the present invention is that of providing a permanent magnet-assisted synchronous reluctance motor in which it is possible to optimise the amount of magnetic material used.
  • a permanent magnet- assisted synchronous reluctance motor is provided according to claim 1.
  • figure 1 is a schematic cross-section view of a permanent magnet- assisted synchronous reluctance motor, in which the main components have been illustrated;
  • figure 2 is a schematic perspective view of the rotor of a synchronous reluctance motor according to the present invention
  • figure 3 is a schematic cross-section view of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention
  • figure 4 is a schematic cross-section view of a further version of a rotor of a permanent magnet-assisted synchronous reluctance motor according to the present invention
  • figure 5 is a comparison graph between the efficiency curve of a PM brushless motor and that of a reluctance motor according to the present invention.
  • the permanent magnet-assisted synchronous reluctance motor 1 comprises a stator 2 defining a central seat inside which there is a rotating rotor 3.
  • stator windings At the peripheral portion inside the stator 2, which faces onto the rotor 3, there is a plurality of stator windings, wholly indicated with reference numeral 4.
  • Figure 2 illustrates, as a non-limiting example, an embodiment of a rotor 3.
  • the rotor 3 comprises a plurality of circular elements 5 that are adjacent to one another and one after the other so as to make a substantially cylindrical element.
  • the rotor 3 has a central axis of symmetry 12, around which it is set in rotation during operation of the permanent magnet-assisted synchronous reluctance motor 1.
  • Each circular element 5 has a central through opening 6, for housing a central shaft that is not illustrated in the figures, and a plurality of shaped seats 7.
  • the number and the arrangement of the shaped seats 7 can vary as a function of the number of poles of the synchronous reluctance motor 1.
  • the rotor 3 illustrated in figures 1-4 is provided for a synchronous reluctance motor 1 with four poles.
  • a synchronous reluctance motor 1 comprising a greater number of poles, for example six, eight, ten, twelve poles, etcetera, without for this reason departing from the scope of protection of the present invention.
  • the seats 7 are separated from one another by conveying portions 8.
  • Such conveying portions 8 constitute structural elements for each circular element 5. Furthermore, the conveying portions 8 define preferential paths, called “channels", along which the magnetic flux generated by the stator windings 4 is channelled.
  • the seats 7 allow permanent magnets 9, 10, 1 1 to be positioned, the number and the dimension of which varies as a function of the performance of the synchronous reluctance motor, for example with reference to the number of poles, to the power of the motor, etcetera.
  • the length of the permanent magnets 9, 10, 1 1 substantially extends for the same longitudinal length of the rotor 3.
  • Each seat 7 comprises a substantially rectilinear central portion 13, at which the permanent magnets 9 are positioned.
  • Figure 4 illustrates a further version of the present invention, in which inside the seats 7, at the central portion 13, the permanent magnets 1 1 in ferrite are positioned.
  • the permanent magnets 9, 10, 1 1 are positioned, in groups, which are aligned along the axes defining the poles of the permanent magnet-assisted synchronous reluctance motor 1.
  • the permanent magnets 9, 10, 1 1 are arranged in a symmetrical manner inside the rotor 3.
  • each permanent magnet 9, 10, 1 1 is substantially prism-shaped.
  • each permanent magnet 9, 10, 1 1 has a long side 14 and a short side 15.
  • the central portion 13 of each seat 7 has an elongated portion in the circumferential direction.
  • Each permanent magnet 9, 10, 1 1 is positioned inside a corresponding seat 7, with the long side 14 oriented parallel to the central portion 13.
  • a magnet in ferrite has greater dimensions with respect to a rare earth magnet of the type Neodymium-Ferrite-Boron ( dFeB).
  • the rotor 3 has seats 7 such as to be able to independently house permanent magnets 10 in NdFeB or permanent magnets in ferrite 1 1 with equal magnetic power.
  • a permanent magnet 1 1 in ferrite to be installed in one of the seats 7 is longer than a permanent magnet in NdFeB 10.
  • a permanent magnet-assisted synchronous reluctance motor 1 can be easily modified based upon the foreseen use, without needing to modify the overall structure of the entire motor. Indeed, it is sufficient to modify the type of permanent magnets 9, 10, 1 1 used.
  • a permanent magnet-assisted 9, 10, 1 1 synchronous reluctance motor 1 has an efficiency that is increased by around 20% with respect to a motor of the PM brushless (Permanent Magnet brushless) type of equal power.
  • Figure 5 illustrates, as an example but not for limiting purposes, a comparison graph between a curve of efficiency of a motor of the PM brushless type, of the power of around 7.5 kW, shown with a continuous solid line 16, and that of a permanent magnet-assisted reluctance motor 1 of equivalent power, according to the present invention, shown with a broken discontinuous line 17.
  • the curve 17 of the permanent magnet-assisted reluctance motor 1 according to the present invention is greater than the curve 16 of a PM brushless motor.
  • the efficiency of a permanent magnet-assisted reluctance motor 1 according to the present invention, for partial loads, is greater than that of a PM brushless motor of corresponding power.
  • the permanent magnet-assisted reluctance motor 1 according to the present invention and a PM brushless motor substantially have the same efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un moteur (1) à réluctance synchrone perfectionné assisté par des aimants permanents, ledit moteur comprenant un stator (2) comprenant des enroulements statoriques (4) qui définissent un siège dans lequel est positionné un rotor sensiblement cylindrique (3) comprenant une pluralité d'éléments circulaires (5) adjacents les uns par rapport aux autres et les uns après les autres, chaque élément circulaire (5) comprenant un axe de symétrie central (12), le rotor (3) étant associé en rotation au stator (2) autour de l'axe de symétrie central (12), le rotor (3) comprenant des sièges (7) séparés les uns des autres par des parties destinées à transporter un flux magnétique (8) où des aimants permanents (9, 10, 11) sont positionnés selon un nombre tel pour déterminer une valeur de la différence de phase entre le courant et la tension pour le moteur (1) à réluctance synchrone perfectionné assisté par des aimants permanents de cos φ comprise entre 0,75 et 0,82.
EP14830671.5A 2013-12-19 2014-12-16 Moteur à réluctance synchrone perfectionné assisté par des aimants permanents Withdrawn EP3084937A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000056U ITVR20130056U1 (it) 2013-12-19 2013-12-19 Motore sincrono a riluttanza di tipo ottimizzato assistito da magneti permanenti.
PCT/IB2014/066955 WO2015092672A2 (fr) 2013-12-19 2014-12-16 Moteur à réluctance synchrone perfectionné assisté par des aimants permanents

Publications (1)

Publication Number Publication Date
EP3084937A2 true EP3084937A2 (fr) 2016-10-26

Family

ID=50683726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14830671.5A Withdrawn EP3084937A2 (fr) 2013-12-19 2014-12-16 Moteur à réluctance synchrone perfectionné assisté par des aimants permanents

Country Status (3)

Country Link
EP (1) EP3084937A2 (fr)
IT (1) ITVR20130056U1 (fr)
WO (1) WO2015092672A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161727A1 (it) * 2016-03-16 2017-09-16 D&M Holding S P A Generatore elettrico sincrono a riluttanza
IT201700100814A1 (it) * 2017-09-08 2019-03-08 S M E S P A Procedimento per l'assemblaggio di un rotore di un motore sincrono a riluttanza variabile e tale rotore
JP6879140B2 (ja) * 2017-09-15 2021-06-02 トヨタ自動車株式会社 回転電機
CN108023454A (zh) * 2018-01-26 2018-05-11 湖北工业大学 一种新型异步起动铁氧体永磁辅助式磁阻同步电机
CN110231133B (zh) * 2019-06-26 2020-11-24 北京航空航天大学 一种磁悬浮轴承电流刚度和位移刚度测量方法
CN112234727B (zh) * 2020-09-30 2021-07-23 东南大学 一种变永磁磁链同步磁阻电机系统的效率优化控制方法
CN114123581B (zh) * 2021-11-16 2023-06-06 珠海格力电器股份有限公司 自起动永磁辅助同步磁阻电机转子和电机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030094875A1 (en) * 2001-03-07 2003-05-22 Aisin Seiki Kabushiki Kaisha Synchronous reluctance motor
WO2013020312A1 (fr) * 2011-08-05 2013-02-14 珠海格力电器股份有限公司 Rotor de moteur et moteur comportant ce rotor
CN103095078A (zh) * 2011-11-01 2013-05-08 太仓富田瑞兰得电机有限公司 一种带辅助永磁体的横向叠片式同步磁阻电机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030094875A1 (en) * 2001-03-07 2003-05-22 Aisin Seiki Kabushiki Kaisha Synchronous reluctance motor
WO2013020312A1 (fr) * 2011-08-05 2013-02-14 珠海格力电器股份有限公司 Rotor de moteur et moteur comportant ce rotor
EP2741400A1 (fr) * 2011-08-05 2014-06-11 Gree Electric Appliances, Inc. of Zhuhai Rotor de moteur et moteur comportant ce rotor
CN103095078A (zh) * 2011-11-01 2013-05-08 太仓富田瑞兰得电机有限公司 一种带辅助永磁体的横向叠片式同步磁阻电机

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROBERT VARTANIAN ET AL: "Power factor improvement of synchronous reluctance motors (SynRM) using permanent magnets for drive size reduction", APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC), 2012 TWENTY-SEVENTH ANNUAL IEEE, IEEE, 5 February 2012 (2012-02-05), pages 628 - 633, XP032127734, ISBN: 978-1-4577-1215-9, DOI: 10.1109/APEC.2012.6165884 *

Also Published As

Publication number Publication date
WO2015092672A3 (fr) 2015-08-27
WO2015092672A2 (fr) 2015-06-25
ITVR20130056U1 (it) 2015-06-20

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