WO2009037374A1 - Moteur électrique - Google Patents

Moteur électrique Download PDF

Info

Publication number
WO2009037374A1
WO2009037374A1 PCT/FI2008/000105 FI2008000105W WO2009037374A1 WO 2009037374 A1 WO2009037374 A1 WO 2009037374A1 FI 2008000105 W FI2008000105 W FI 2008000105W WO 2009037374 A1 WO2009037374 A1 WO 2009037374A1
Authority
WO
WIPO (PCT)
Prior art keywords
line
permanent magnet
permanent magnets
edge line
electric motor
Prior art date
Application number
PCT/FI2008/000105
Other languages
English (en)
Inventor
Jussi LÄHTEENMÄKI
Mika Virnes
Original Assignee
Kone Corporation
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 Kone Corporation filed Critical Kone Corporation
Publication of WO2009037374A1 publication Critical patent/WO2009037374A1/fr

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
    • 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

Definitions

  • the present invention relates to an electric motor as defined in the preamble of claim 1 and a method for manufacturing an electric motor as defined in the preamble of claim 6.
  • rotating polyphase electric motors such as a synchronous motor
  • the shape of the magnetic field affects e.g. the eddy current dissipation and the torque ripple of the motor.
  • the geometry of the magnetic circuit and also, e.g. in a permanent magnet motor, the shape of the permanent magnets of the rotor affect the shape of the magnetic field.
  • the purpose of the present invention is to disclose an electric motor, in which by shaping the edge lines of the permanent magnets disposed on the rotor the problems caused by the geometry of the magnetic circuit of the motor as well as by the distribution of flux density of the motor produced by the permanent magnets are solved. More particularly the solution of these problems is intended to improve the torque producing capacity of an electric motor as well as to reduce the eddy current dissipation and torque ripple of the electric motor.
  • the electric motor according to the invention is characterized by what is disclosed in the characterization part of claim 1.
  • the method for manufacturing an electric motor according to the invention is characterized by what is disclosed in the characterization part of claim 6.
  • Other embodiments of the invention are characterized by what is disclosed in the other claims.
  • inventive embodiments are also discussed in the descriptive section and in the drawings of the present application.
  • inventive content of the application can also be defined differently than in the claims presented below.
  • inventive content may also consist of several separate inventions, especially if the invention is considered in the light of expressions or implicit sub-tasks or from the point of view of advantages or categories of advantages achieved. In this case, some of the attributes contained in the claims below may be superfluous from the point of view of separate inventive concepts.
  • the features of the various embodiments can be applied within the scope of the basic inventive concept in conjunction with other embodiments.
  • the electric motor according to the invention comprises a stator, a rotor and the air gap between these, and in which motor the stator comprises slots and conductors fitted into the slots, and in which the rotor comprises permanent magnets of homogeneous thickness placed consecutively on the rim in the direction of the movement of rotation, which consecutive permanent magnets abut the air gap, and the magnetic poles of which consecutive permanent magnets are fitted alternately in opposite directions in relation to the air gap.
  • the edge line of at least one permanent magnet divides into two sides, asymmetrical to each other in relation to the normal of the center line x running through the geometric center point of the permanent magnet, of which the first side of the edge line is limited to between 0 ...
  • the second side of the edge line is limited to between ⁇ /2 ... ⁇ in relation to the geometric center line x
  • the first side of the aforementioned edge line roughly follows the curves Asinx and -Asinx
  • the second side of the aforementioned edge line roughly follows the curves A(sinx-l) and -A(sinx-l) .
  • the first and second side of the edge line of the permanent magnet also roughly follow the curves Bsin3x and -Bsin3x.
  • the length of the air gap between the stator and the rotor is fitted to be essentially constant.
  • the edge lines of at least the first and the second consecutively fitted permanent magnet are made in the aforementioned manner to be asymmetrical in relation to the normals of the center lines x passing through the geometric center points of the aforementioned permanent magnets, and the projected distance to the geometric centre line x between at least the second side of the edge line of the first permanent magnet and the first side of the edge line of the second permanent magnet, is larger than or equal to zero.
  • the distances of the geometric center points of consecutively fitted permanent magnets are selected to deviate from the distance between the slots as well as from a multiple of the distance.
  • the aforementioned permanent magnets are fitted into a fixing matrix on the surface of the rotor on the side of the air gap, which fixing matrix is manufactured preferably from stainless steel .
  • the fixing matrix can also however be manufactured from another material that induces eddy currents badly, such as fiberglass laminate or plastic .
  • the direction of the back line of the second side of the edge line of the permanent magnet deviates from the direction of the geometric center line x and the rest of the edge line of the second side deviates from the curve ⁇ A(sinx-l) and possibly also from the curve +B(sin3x).
  • the aforementioned deviation of the direction of the back line from the direction of the geometric center line x is congruent with that deviation by which the rest of the edge line of the second side deviates from the curve ⁇ A(sinx-l) and possibly also from the curve ⁇ B(sin3x).
  • Congruence in this context means that the rest of the edge line of the second side roughly follows the aforementioned curves in a case where the curves are determined in relation to a line which is parallel with the back line that deviates from the direction of the aforementioned center line instead of the geometric center line of the magnets.
  • a stator, a rotor and the air gap between them is fitted in the electric motor; slots are made in the stator; conductors are fitted into the slots; permanent magnets of homogeneous thickness are placed, consecutively on the rim in the direction of rotation movement, on the rotor so that they abut the air gap such that the magnetic poles of consecutive permanent magnets are fitted alternately in opposite directions in relation to the air gap; the first side of the edge line of the first permanent magnet is shaped to roughly follow the curves Asinx and -Asinx; and the second side of the edge line of said first permanent magnet is shaped to roughly follow the curves A(sinx-l) and -A(sinx-l).
  • the first and second side of the edge line of the first permanent magnet are shaped to also roughly follow the curves Bsin3x and -Bsin3x.
  • the length of the air gap between the stator and the rotor is fitted to be essentially constant.
  • the projected distance between at least the second side of the first permanent magnet and the first side of the second consecutive permanent magnet to the geometric centre line is fitted to be larger than or equal to zero.
  • the permanent magnets are disposed consecutively such that the distances of the geometric center points of consecutive permanent magnets differ from the distance between the slots as well as from a multiple of the distance.
  • the aforementioned permanent magnets are fitted into a fixing matrix on the surface of the rotor on the side of the air gap, which fixing matrix is manufactured preferably from stainless steel.
  • the direction of the back line of the second side of the edge line of the permanent magnet is shaped to deviate from the direction of the geometric center line x such that the aforementioned deviation of the direction of the back line is congruent with that deviation by which the rest of the edge line of the second side deviates from the curve ⁇ A(sinx-l) and possibly also from the curve +B(sin3x) .
  • One electric motor according to the invention is an axial flux motor.
  • the electric motor according to the invention can also, however, be a radial flux motor.
  • One electric motor according to the invention is an elevator motor.
  • the flux produced in the magnetic circuit by the permanent magnets is distributed more evenly than in a case where the shaping in relation to the center line x is asymmetrical
  • the effective distance between the edge lines of two consecutive permanent magnets can be dimensioned to be shorter without the permanent magnets touching each other as they would if the shaping were symmetrical in relation to the normal of the aforementioned center line x.
  • the projected distance to the geometric center line x between two consecutive permanent magnets can be set to zero without the permanent magnets touching each other. In a symmetrical solution according to prior art this would require that the magnets touch each other.
  • the fixing matrix would detach from between the permanent magnets and its strength properties would be weakened. Furthermore, locally large magnetic forces would form at the point in which the permanent magnets touched each other.
  • the projected distance between two consecutive permanent magnets to the geometric centre line x can set as zero without the permanent magnets touching each other.
  • the flux produced by the permanent magnets can be fitted to be sinusoidal without the type of harmonics caused by a discontinuity of the flux that would be caused in a situation in which the projected distance between the aforementioned permanent magnets to the geometric center line was greater than zero
  • Fig. 1 presents one stator of the electric motor
  • Fig. 2 presents one placement of the rotor and the stator of the electric motor
  • Fig. 3 presents one permanent magnet according to the invention
  • Fig. 4 presents one placement of the permanent magnets of the rotor according to the invention
  • Fig. 5 presents one permanent magnet according to the invention.
  • Fig. 1 presents the stator 1 of an axial flux motor that is in itself prior art. Slots 16 are made in the stator. The distance 15 between the slots is measured from that point of the slot in which the geometric center line 5 of the permanent magnets 3, 4 of the rotor is situated perpendicularly in relation to the air gap on the side of the rotor.
  • Fig. 2 presents the relative placement of the rotor 1 and the stator 2 of one axial flux motor.
  • the rotor 1 and the stator 2 are fitted to face each other such that the air gap 21 is essentially in the direction of the axis of rotation, and the length of the air gap is essentially constant.
  • the permanent magnets 3, 4 are fitted onto the rotor 2 on the surface 17 on the side of the air gap of the rotor.
  • Fig. 3 presents one permanent magnet 3, 4 according to the invention.
  • the edge line of the permanent magnet divides into two sides, asymmetrical to each other in relation to the normal 20 of the center line x 5 that passes through the geometric center point 11 of the permanent magnet, of which the first edge line 6 of the first side roughly follows the curve Asinx + Bsin3x; on the other hand, the second edge line 7 of the first side roughly follows the curve -Asinx - Bsin3x.
  • the first edge line 10 of the second side roughly follows the curve -A(sinx-l) + Bsin3x; on the other hand, the second edge line 9 of the second side roughly follows the curve A(sinx-l) - Bsin3x.
  • the third edge line, i.e. the back line 8, of the second side is parallel with the geometric center line 5 of the permanent magnets.
  • the first side is limited to between 0 ... ⁇ /2 in relation to the geometric center line x 5, and the second side is limited to between ⁇ /2 ... ⁇ .
  • particularly the first 10 and the second 9 edge line of the second side deviate to some extent from their curves. This deviation results from the fact that following the curve would require cutting the permanent magnet up to the geometric center point 11, which is awkward from the viewpoint of cutting technology. Fig.
  • the precision of the shaping of the permanent magnet is further improved by shaping the back lines 8 of the second side of the permanent magnet to deviate from the direction of the geometric center line 5 of the permanent magnet such that the aforementioned deviation 13 of the direction of the back line is congruent with that deviation 14 by which the rest of the edge line, i.e. the first and the second edge line 9, 10, of the second side differs from the aforementioned curves of the first and second edge line of the second side.
  • Fig. 4 presents one placement of the permanent magnets 3, 4 of the rotor 2 according to the invention.
  • the permanent magnets are disposed on the rim 5 in the direction of the rotation movement, on the surface 17 on the surface of the rotor on the air gap side.
  • the aforementioned rim of the direction of the axis of rotation is in this context also the geometric center line of the permanent magnets.
  • the magnetic poles of consecutive permanent magnets are fitted alternately in opposite directions in relation to the air gap.
  • the permanent magnets are in a fixing matrix 18, which is manufactured of stainless steel, fitted onto the surface of the rotor.
  • the projected distance 12 to the geometric center line of the permanent magnets, between the consecutive permanent magnets 3,4, is selected to be zero. Owing to the asymmetry of the permanent magnets the magnets do not in this case touch each other, and thus the fixing matrix 18 does not detach between the permanent magnets, which improves the strength properties of the matrix.

Landscapes

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

Abstract

La présente invention concerne un moteur électrique et un procédé de fabrication d'un moteur électrique. Le moteur électrique comprend un stator (1), un rotor (2) et, intercalé entre ces derniers, un entrefer (21). Le stator comprend des fentes (16) et des conducteurs ajustés dans les fentes. Le rotor comprend des aimants permanents (3, 4) d'une épaisseur homogène, placés consécutivement sur une couronne (5) dans le sens du mouvement de rotation, lesdits aimants permanents consécutifs viennent en butée avec l'entrefer et leurs pôles magnétiques consécutifs sont adaptés dans des directions opposées par rapport à l'entrefer. La ligne de bordure d'au moins un aimant permanent effectue une division en deux côtés, asymétriques l'un par rapport à l'autre et par rapport à la normale (20) de l'axe central x (5) qui traverse le point central géométrique (11) de l'aimant permanent.
PCT/FI2008/000105 2007-09-21 2008-09-18 Moteur électrique WO2009037374A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20070719A FI120781B (fi) 2007-09-21 2007-09-21 Sähkömoottori
FI20070719 2007-09-21

Publications (1)

Publication Number Publication Date
WO2009037374A1 true WO2009037374A1 (fr) 2009-03-26

Family

ID=38572914

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/000105 WO2009037374A1 (fr) 2007-09-21 2008-09-18 Moteur électrique

Country Status (2)

Country Link
FI (1) FI120781B (fr)
WO (1) WO2009037374A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011100991A1 (fr) * 2010-02-18 2011-08-25 Kone Corporation Rotor à aimant permanent et moteur à aimant permanent
WO2011121184A1 (fr) * 2010-03-31 2011-10-06 Kone Corporation Moteur électrique, machine de levage et système d'ascenseur
CN108880030A (zh) * 2017-05-12 2018-11-23 蒂森克虏伯电梯（上海）有限公司 曳引机转子及具有该转子的曳引机
WO2023217353A1 (fr) * 2022-05-10 2023-11-16 Kone Corporation Moteur d'ascenseur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906320A (en) * 1972-10-27 1975-09-16 Papst Motoren Kg Control of brushless D-C motors
DE2843375A1 (de) * 1978-10-05 1980-04-24 Bosch Gmbh Robert Permanentmagnet fuer elektrische maschinen, insbesondere kleinmotoren
US4508998A (en) * 1981-02-09 1985-04-02 David H. Rush Brushless disc-type DC motor or generator
WO1999059233A1 (fr) * 1998-05-08 1999-11-18 Pyrhoenen Juha Magneto synchrone

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906320A (en) * 1972-10-27 1975-09-16 Papst Motoren Kg Control of brushless D-C motors
DE2843375A1 (de) * 1978-10-05 1980-04-24 Bosch Gmbh Robert Permanentmagnet fuer elektrische maschinen, insbesondere kleinmotoren
US4508998A (en) * 1981-02-09 1985-04-02 David H. Rush Brushless disc-type DC motor or generator
WO1999059233A1 (fr) * 1998-05-08 1999-11-18 Pyrhoenen Juha Magneto synchrone

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PARVIAINEN A. ET AL.: "Axial flux interior permanent magnet synchronous motor with sinusoidally shaped magnets", ISEF 2001 - 10TH INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC FIELDS IN ELECTRICAL ENGINEERING CRACOW, 20 September 2001 (2001-09-20) - 22 September 2001 (2001-09-22), Retrieved from the Internet <URL:http://www.cedrat.com/fileadmin/user_upload/cedrat_groupe/Publications/Publications/2001/09/Axialflux_interior_permanentmagnetsynchromotor.pdf>.,> *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011100991A1 (fr) * 2010-02-18 2011-08-25 Kone Corporation Rotor à aimant permanent et moteur à aimant permanent
WO2011121184A1 (fr) * 2010-03-31 2011-10-06 Kone Corporation Moteur électrique, machine de levage et système d'ascenseur
CN102859842A (zh) * 2010-03-31 2013-01-02 通力股份公司 电动机、卷扬机和升降机系统
JP2013523559A (ja) * 2010-03-31 2013-06-17 コネ コーポレイション 電動機、巻上機およびエレベータシステム
US8698368B2 (en) 2010-03-31 2014-04-15 Kone Corporation Electric motor, hoisting machine and elevator system
CN102859842B (zh) * 2010-03-31 2015-09-09 通力股份公司 电动机、卷扬机和升降机系统
US9209657B2 (en) 2010-03-31 2015-12-08 Kone Corporation Electric motor, hoisting machine and elevator system
JP2016165222A (ja) * 2010-03-31 2016-09-08 コネ コーポレイションＫｏｎｅ Ｃｏｒｐｏｒａｔｉｏｎ 電動機、巻上機およびエレベータシステム
CN108880030A (zh) * 2017-05-12 2018-11-23 蒂森克虏伯电梯（上海）有限公司 曳引机转子及具有该转子的曳引机
WO2023217353A1 (fr) * 2022-05-10 2023-11-16 Kone Corporation Moteur d'ascenseur

Also Published As

Publication number Publication date
FI120781B (fi) 2010-02-26
FI20070719A0 (fi) 2007-09-21
FI20070719A (fi) 2009-03-22

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