EP2102966A1 - An electric motor - Google Patents

An electric motor

Info

Publication number
EP2102966A1
EP2102966A1 EP07858174A EP07858174A EP2102966A1 EP 2102966 A1 EP2102966 A1 EP 2102966A1 EP 07858174 A EP07858174 A EP 07858174A EP 07858174 A EP07858174 A EP 07858174A EP 2102966 A1 EP2102966 A1 EP 2102966A1
Authority
EP
European Patent Office
Prior art keywords
stator
magnet
electric motor
laminae
magnets
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Withdrawn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
EP07858174A
Other languages
German (de)
French (fr)
Inventor
Cihad Ekin
Harun Acikgoz
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 AS filed Critical Arcelik AS
Publication of EP2102966A1 publication Critical patent/EP2102966A1/en
Withdrawn legal-status Critical Current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]

Definitions

  • the present invention relates to an electric motor.
  • the magnet or magnets placed inside the rotor interact magnetically with the windings on the stator by means of the magnetic flux radiated and provide the motor to rotate.
  • the magnetic flux vectors are directed from the one pole to the other pole of the magnet without intersecting with each other.
  • the distribution of the flux vectors changes with respect to the power of the magnetic field and the environment through which it passes.
  • the most suitable form is attained in uniform distribution. There can be flux straying with very wide intervals at the end of the magnets due to particularly uniform distribution of the magnetic flux emitted from the corners thereof.
  • the aim of the present invention is the realization of a motor wherein the magnetic flux vectors are directed without straying for increasing power and efficiency.
  • the electric motor of the present invention (1) comprises a stator (2) and a rotor (3) moving inside the stator (2) and formed like a bundle by stacking the lamination plates produced of ferromagnetic material, preferably steel sheets.
  • the rotor (3) comprises two magnets (4) that create magnetic flux, one or more side laminae (5) disposed between the magnets (4) and the stator (2) and one or more intermediary laminae (6) remaining between the magnets (4).
  • the magnet (4) is disposed vertical to the rotor (3) axis and configured as a rectangular prism. The lateral sides of the magnet (4) face the stator (2).
  • the electric motor (1) furthermore comprises a magnetic retaining projection (7) that holds the magnet (4) and the side laminae (5) together, formed on the side laminae (5) by bending towards the lateral sides of the magnet (4) facing the stator (2) such that the corners of the magnet (4) are enclosed in and prevents magnetic flux straying.
  • the magnet retaining projections (7) prevent the straying magnetic flux vectors to be emitted irregularly from the magnet (4) corner and assist in conveying the magnetic flux vectors to the stator (2) ( Figure 1).
  • the two magnets (4) with rectangular cross-sections disposed in the rotor (3) are positioned to be parallel and the opposite poles of each facing each other.
  • the magnetic flux vectors between the two magnets (4) are directed from one pole of one of the magnets (4) towards the opposite pole of the other magnet (4) through the intermediary laminae (6).
  • the magnetic flux vectors emitted from the poles of the magnets (4) facing the stator (2) are transmitted to the stator (2) by means of the side laminae (5).
  • the side laminae (5) have a profile matching the inner geometry of the stator (2) so as to minimize the flux vectors emitted from the magnets (4) that pass through air.
  • the surfaces of the side laminae (5) on the side of the magnet (4) are flat and the surfaces on the side of the stator (2) are semi-circular.
  • the magnet retaining projections (7) disposed on the side laminae (5) prevent the magnetic flux straying formed at the corners of the magnet (4) by covering the corners of the magnet (4) facing the stator (2).
  • the magnet retaining projections (7) cover an area less than half the width of the lateral side of the magnet (4) facing the stator (2).
  • the magnet retaining projections (7) form a circular surface on the corner of the magnet (4) such that the magnetic flux vectors are directed vertically to the stator (2).
  • the magnetic flux vectors are directed towards the intermediary laminae (6) by means of the magnet retaining projections (7) having a circular surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The present invention relates to an electric motor (1) of which the efficiency and power are increased.

Description

Description AN ELECTRIC MOTOR
[0001] The present invention relates to an electric motor.
[0002] In motors, the magnet or magnets placed inside the rotor interact magnetically with the windings on the stator by means of the magnetic flux radiated and provide the motor to rotate. The magnetic flux vectors are directed from the one pole to the other pole of the magnet without intersecting with each other. The distribution of the flux vectors changes with respect to the power of the magnetic field and the environment through which it passes. On the other hand, the most suitable form is attained in uniform distribution. There can be flux straying with very wide intervals at the end of the magnets due to particularly uniform distribution of the magnetic flux emitted from the corners thereof.
[0003] It is not possible to direct all of the magnetic flux into the stator because of the magnetic flux straying that occur particularly at the corners of magnets. The magnets are disposed on the rotor by means of laminae used for guiding the magnetic flux. Thus the efficient operation of the motor is maintained by guiding the maximum number of magnetic flux vectors into the motor. In the state of the art, various laminae applications are devised for guiding the magnetic flux on the stator without dispersing and straying for increasing motor efficiency.
[0004] In the state of the art Japanese Patent Applications No JP2005065417 and No JP2002136008 and the United States of America Patent Applications No US2002079768 and No US4954736, the straying of magnetic flux vectors at the magnet corners is prevented by side by side positioning of the magnetic ends of alternation poles.
[0005] Another embodiment is explained in state of the art Japanese Patent Application No JP2002136008. In the said document a magnet surrounded by a single laminated steel sheet is disposed inside a semi-circular void that particularly covers the side face thereof at the straying region of the corners. Thus the magnetic flux is intended to flow from the end portions adjacent to the laminae instead of the void.
[0006] The aim of the present invention is the realization of a motor wherein the magnetic flux vectors are directed without straying for increasing power and efficiency.
[0007] Realized in order to attain the aim of the present invention and explicated in the first claim and the respective claims thereof, the explication is given as to how the magnet corners are covered by the magnetic retaining projections situated on the side laminae for preventing magnetic flux straying.
[0008] By means of the present invention, both magnetic flux straying is prevented and the magnets and the side laminae are held together.
[0009] The electric motor realized in order to attain the aim of the present invention is illustrated in the attached figures, where: [0010] Figure 1 - is the schematic view of an electric motor.
[0011] The elements illustrated in the figures are numbered as follows:
1. Electric motor
2. Stator
3. Rotor
4. Magnet
5. Side laminae
6. Intermediary laminae
7. Magnet retaining projection
[0012] The electric motor of the present invention (1) comprises a stator (2) and a rotor (3) moving inside the stator (2) and formed like a bundle by stacking the lamination plates produced of ferromagnetic material, preferably steel sheets.
[0013] The rotor (3) comprises two magnets (4) that create magnetic flux, one or more side laminae (5) disposed between the magnets (4) and the stator (2) and one or more intermediary laminae (6) remaining between the magnets (4). The magnet (4) is disposed vertical to the rotor (3) axis and configured as a rectangular prism. The lateral sides of the magnet (4) face the stator (2).
[0014] The electric motor (1) furthermore comprises a magnetic retaining projection (7) that holds the magnet (4) and the side laminae (5) together, formed on the side laminae (5) by bending towards the lateral sides of the magnet (4) facing the stator (2) such that the corners of the magnet (4) are enclosed in and prevents magnetic flux straying. The magnet retaining projections (7) prevent the straying magnetic flux vectors to be emitted irregularly from the magnet (4) corner and assist in conveying the magnetic flux vectors to the stator (2) (Figure 1).
[0015] In the preferred embodiment of the electric motor (1) of the present invention, the two magnets (4) with rectangular cross-sections disposed in the rotor (3) are positioned to be parallel and the opposite poles of each facing each other. The magnetic flux vectors between the two magnets (4) are directed from one pole of one of the magnets (4) towards the opposite pole of the other magnet (4) through the intermediary laminae (6). The magnetic flux vectors emitted from the poles of the magnets (4) facing the stator (2) are transmitted to the stator (2) by means of the side laminae (5). The side laminae (5) have a profile matching the inner geometry of the stator (2) so as to minimize the flux vectors emitted from the magnets (4) that pass through air. The surfaces of the side laminae (5) on the side of the magnet (4) are flat and the surfaces on the side of the stator (2) are semi-circular. The magnet retaining projections (7) disposed on the side laminae (5) prevent the magnetic flux straying formed at the corners of the magnet (4) by covering the corners of the magnet (4) facing the stator (2).
[0016] By means of covering the corners of the magnet (4) with the magnet retaining projections (7), the maximum number of magnetic flux vectors is directed to the stator (2) and these are guided inside the stator (2) to follow the longest possible path. [0017] In another embodiment of the present invention, the magnet retaining projections (7) cover an area less than half the width of the lateral side of the magnet (4) facing the stator (2). [0018] In another embodiment of the present invention, the magnet retaining projections (7) form a circular surface on the corner of the magnet (4) such that the magnetic flux vectors are directed vertically to the stator (2). The magnetic flux vectors are directed towards the intermediary laminae (6) by means of the magnet retaining projections (7) having a circular surface.

Claims

Claims
[0001] An electric motor (1) comprising a stator (2) and a rotor (3) moving inside the stator (2) and formed like a bundle by stacking the lamination plates produced by ferromagnetic material, preferably steel sheets, having two magnets (4) that create magnetic flux disposed vertical to the rotation axis, one or more side laminae (5) disposed between the magnets (4) and the stator (2) and one or more intermediary laminae (6) remaining between the magnets (4) and characterized by one or more magnetic retaining projections (7) formed on the side laminae (5) by bending towards the lateral sides of the magnet (4) facing the stator (2) such that the corners of the magnet (4) are enclosed in.
[0002] An electric motor (1) as in Claim 1, characterized by the magnetic retaining projection (7) that covers the corners of the magnet (4) facing the stator (2).
[0003] An electric motor (1) as in Claim 2, characterized by the magnetic retaining projection (7) that covers an area less than the half width of the lateral side of the magnet (4) facing the stator (2).
[0004] An electric motor (1) as in any one of the above claims, characterized by the magnetic retaining projection (7) having a circular surface.
EP07858174A 2006-12-29 2007-12-27 An electric motor Withdrawn EP2102966A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200607700 2006-12-29
PCT/EP2007/064578 WO2008080947A1 (en) 2006-12-29 2007-12-27 An electric motor

Publications (1)

Publication Number Publication Date
EP2102966A1 true EP2102966A1 (en) 2009-09-23

Family

ID=39276365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07858174A Withdrawn EP2102966A1 (en) 2006-12-29 2007-12-27 An electric motor

Country Status (2)

Country Link
EP (1) EP2102966A1 (en)
WO (1) WO2008080947A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3492520A (en) * 1967-02-14 1970-01-27 Westinghouse Electric Corp Permanent magnet rotor
JPH04261346A (en) * 1991-01-30 1992-09-17 Matsushita Electric Works Ltd Rotor for rotary solenoid
US6940205B1 (en) * 1997-09-08 2005-09-06 Matsushita Electric Industrial Co., Ltd. Permanent magnet synchronous motor
EP1458077A1 (en) * 2003-03-12 2004-09-15 ebm-papst St. Georgen GmbH & Co. KG Multi-phase electric motor with rotor having embedded permanent magnets
JP4969064B2 (en) * 2005-06-14 2012-07-04 日立アプライアンス株式会社 Electric motor rotor and electric motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008080947A1 *

Also Published As

Publication number Publication date
WO2008080947A1 (en) 2008-07-10

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