EP0303703A1 - Rotor de moteur a aimant permanent - Google Patents

Rotor de moteur a aimant permanent Download PDF

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Publication number
EP0303703A1
EP0303703A1 EP88901645A EP88901645A EP0303703A1 EP 0303703 A1 EP0303703 A1 EP 0303703A1 EP 88901645 A EP88901645 A EP 88901645A EP 88901645 A EP88901645 A EP 88901645A EP 0303703 A1 EP0303703 A1 EP 0303703A1
Authority
EP
European Patent Office
Prior art keywords
magnetic flux
rotor
yokes
electric motor
magnet
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Withdrawn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
EP88901645A
Other languages
German (de)
English (en)
Other versions
EP0303703A4 (fr
Inventor
Masatoyo Sogabe
Kazushi Kumagai
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
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 Fanuc Corp filed Critical Fanuc Corp
Publication of EP0303703A1 publication Critical patent/EP0303703A1/fr
Publication of EP0303703A4 publication Critical patent/EP0303703A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses

Definitions

  • the present invention relates to a type of rotor structure having magnets fixed on the outer surface thereof, in an electric motor.
  • the latter is hereinafter called an armature reaction magnetic flux.
  • An electric current must flow in a coil in each slot of the stator in response to a change of a main flux caused by magnets on the rotor, to ensure the performance of an electric motor.
  • a phase of the armature reaction magnetic flux caused by an electric current flowing in a coil is shifted by r/2 on the base of a main magnetic flux generated on the rotor.
  • an object of the present invention is to eliminate the saturation of the output torque in an electric motor, and thus solve the above problem.
  • the present invention provides a rotor structure of an electric motor, characterized in that a plurality of yokes are fixed on an outer surface of a rotor core and separated by an equi-distance from each other, and that a magnet is fixed on a surface of each yoke.
  • a main magnetic flux and an armature reaction magnetic flux pass through the rotor along different paths, respectively, because each flux is shifted by «/2 in phase from the other.
  • a recessed portion of the rotor is formed by a pair of adjacent yokes, and because a high density portion of the generated armature reaction magnetic flux passes through the recessed portion which has a large magnetic reluctance, due to the presence of air therein, the magnetic flux density of the armature reaction magnetic flux is reduced. Consequently, a reduction of a magnetic permeability of an electromagnetic steel plate constructing a rotor can be prevented, to thereby improve an output torque of the motor.
  • a rotor core 12 formed by stacked electromagnetic steel plates is fixed on a rotor shaft 10, and yokes 13 are fixed on the outer surface of the rotor core 12 and separated by an equi-distance from each other in a circular direction, each of the yokes 13 having the same thickness and the same configuration.
  • each of the yokes 13 is made of stacked electromagnetic steel plates such as the rotor core 12, in view of the performance of an electric motor, and in this embodiment, each of the stacked electromagnetic steel plates forming each of the yokes 13 is formed integrally with each electromagnetic steel plate constructing the rotor core 12.
  • each yoke 13 may be welded to the outer surface of the rotor core 12 when made of a ferromagnetic substance as a separated part of the rotor core 12.
  • a magnet 14 is fixed to the outer surface of each yoke 13 by an adhesive.
  • An outline of the magnet 14 has sine curves or close curves thereto at both sides thereof in a longitudinal direction of the rotor shaft 10, and that of each yoke 13 is the same as that of the magnet 14. Consequently, a pair of yokes 13 adjacent to each other define a recessed portion 20 between side faces 18 of the yokes 13.
  • the outline of each yoke 13 is the same as a magnet 14, but another outline may be used.
  • the outline of each magnet 14 is a sine curve, another outline also may be used.
  • a main path of the main magnetic flux is represented by a solid line circle 22, and a main path of the armature reaction magnetic flux is represented by a broken line circle 24.
  • the density of the main magnetic flux is high near the circle 22, and low near the center of the circle.
  • the density of the armature reaction magnetic flux is high near the circle 24, and low near the center of the circle.
  • An electromagnetic steel plate material constructing the rotor core 12, the yokes 13, and the stator core 36 has characteristics such that a magnetic permeability p decreases as a magnetic flux density B increases, as shown in Fig. 3. Therefore, in an electric motor not having a recessed portion 20 on a rotor of the prior art, the density of the armature reaction magnetic flux becomes high when an large electric current flows in a coil 32, to increase an output torque, and thus the magnetic permeability p of an electromagnetic steel is reduced. Consequently, a magnetic reluctance is increased for a magnetic path of the main magnetic flux, so that the output torque is not increased as intended.
  • a recessed portion 20 is defined by a pair of yokes 13 adjacent to each other at a position between adjacent magnets 14, in the present invention, and exists in the circle 24 which is a main path of the armature reaction magnetic flux.
  • the magnetic permeability of air is small, namely, the reluctance is large for a magnetic flux
  • the density of the armature reaction magnetic flux caused by an electric current flowing in the coil 32 can be reduced due to the existence of the recessed portion 20, so that the reduction of the magnetic permeability of each electromagnetic steel plate can be prevented, and the output torque can be increased.
  • a reduction of a magnetic permeability of each electromagnetic steel plate constructing a rotor core, yokes, and a stator core, through which a main magnetic flux passes, respectively, can be prevented by an air layer which exists in the recessed portion between yokes in a main path of the armature reaction magnetic flux for increasing a magnetic reluctance for the armature reaction magnetic flux, and therefore, an output torque can be increased. Namely, saturation of an output torque can be eliminated.

Abstract

Structure de rotor d'un moteur. Des culasses (13), chacune équipée d'un aimant permanent (14) fixé à sa circonférence extérieure,sont disposées et fixées autour de la circonférence extérieure d'un noyau central de rotor (12), avec des entrefers prédéterminés entre eux, de telle sorte qu'ils forment des rainures (20) entre les culasses (13). La couche d'air de cette rainure (20) joue le rôle d'une grosse résistance magnétique menant à une voie principale (24) du flux magnétique généré à partir de la face d'un stator (30). Par conséquent, la baisse de perméabilité mu de chacun des noyaux de rotor (12) de la culasse (13) et du noyau du stator (36) peut être limitée et la force de tension de sortie du moteur peut être augmentée tout en minimisant la résistance magnétique dans le chemin principal (22) du flux magnétique principal, généré à partir de l'aimant permanent (14).
EP19880901645 1987-02-16 1988-02-16 Rotor de moteur a aimant permanent. Withdrawn EP0303703A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62031560A JPS63202247A (ja) 1987-02-16 1987-02-16 永久磁石を用いた電動機のロ−タ構造
JP31560/87 1987-02-16

Publications (2)

Publication Number Publication Date
EP0303703A1 true EP0303703A1 (fr) 1989-02-22
EP0303703A4 EP0303703A4 (fr) 1989-06-21

Family

ID=12334558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880901645 Withdrawn EP0303703A4 (fr) 1987-02-16 1988-02-16 Rotor de moteur a aimant permanent.

Country Status (4)

Country Link
EP (1) EP0303703A4 (fr)
JP (1) JPS63202247A (fr)
KR (1) KR930007668B1 (fr)
WO (1) WO1988006374A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107482804A (zh) * 2017-07-31 2017-12-15 江苏大学 一种减小齿槽转矩的新型表贴式永磁同步电机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN186007B (fr) * 1991-12-10 2001-06-02 British Tech Group
JP2006014389A (ja) * 2004-06-22 2006-01-12 Daikin Ind Ltd 回転子、電動機、圧縮機及び送風機、並びに空気調和器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1060028B (de) * 1955-11-24 1959-06-25 Ernst Massar Dr Ing Dauermagneterregte elektrische Maschine
FR2538182A1 (fr) * 1983-12-08 1984-06-22 Kollmorgen Tech Corp Servomoteur a courant continu du type a collecteur a aimants permanents
EP0193611A1 (fr) * 1984-08-29 1986-09-10 Fanuc Ltd. Moteur synchrone d'un systeme de champ magnetique permanent
EP0212552A2 (fr) * 1985-08-14 1987-03-04 Kollmorgen Technologies Corporation Fabrication d'un manchon composé pour un moteur électrique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1004274A (en) * 1974-04-04 1977-01-25 Canadian General Electric Company Limited Permanent magnet hermetic synchronous motor
JPS5951223B2 (ja) * 1977-03-15 1984-12-12 電気音響株式会社 ロ−タ−
JPS5759462A (en) * 1980-09-24 1982-04-09 Meidensha Electric Mfg Co Ltd Assembling method for rotary electric machine
JPS6165868U (fr) * 1984-10-05 1986-05-06

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1060028B (de) * 1955-11-24 1959-06-25 Ernst Massar Dr Ing Dauermagneterregte elektrische Maschine
FR2538182A1 (fr) * 1983-12-08 1984-06-22 Kollmorgen Tech Corp Servomoteur a courant continu du type a collecteur a aimants permanents
EP0193611A1 (fr) * 1984-08-29 1986-09-10 Fanuc Ltd. Moteur synchrone d'un systeme de champ magnetique permanent
EP0212552A2 (fr) * 1985-08-14 1987-03-04 Kollmorgen Technologies Corporation Fabrication d'un manchon composé pour un moteur électrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8806374A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107482804A (zh) * 2017-07-31 2017-12-15 江苏大学 一种减小齿槽转矩的新型表贴式永磁同步电机

Also Published As

Publication number Publication date
WO1988006374A1 (fr) 1988-08-25
EP0303703A4 (fr) 1989-06-21
KR880701178A (ko) 1988-07-26
KR930007668B1 (ko) 1993-08-18
JPS63202247A (ja) 1988-08-22

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