US20010048261A1 - Rotor of electric motor and method for manufacturing the same - Google Patents

Rotor of electric motor and method for manufacturing the same Download PDF

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Publication number
US20010048261A1
US20010048261A1 US09/845,185 US84518501A US2001048261A1 US 20010048261 A1 US20010048261 A1 US 20010048261A1 US 84518501 A US84518501 A US 84518501A US 2001048261 A1 US2001048261 A1 US 2001048261A1
Authority
US
United States
Prior art keywords
cushioning member
permanent magnet
rotor
rotating shaft
electric motor
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.)
Abandoned
Application number
US09/845,185
Other languages
English (en)
Inventor
Tomonori Kojima
Toshiaki Tanno
Ken Maeyama
Hiroshi Okutsu
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General Ltd
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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Assigned to FUJITSU GENERAL LIMITED reassignment FUJITSU GENERAL LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKUTSU, HIROSHI, KOJIMA, TOMONORI, MAEYAMA, KEN, TANNO, TOSHIAKI
Publication of US20010048261A1 publication Critical patent/US20010048261A1/en
Priority to US10/611,882 priority Critical patent/US7120986B2/en
Abandoned legal-status Critical Current

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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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49012—Rotor
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49076—From comminuted material
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49078—Laminated
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/49917—Overedge assembling of seated part by necking in cup or tube wall
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53143—Motor or generator

Definitions

  • the present invention relates to an electric motor for use with a household electrical appliance such as an air conditioner, industrial equipment and the like, and more particularly to a rotor of the electric motor causing little vibration during rotation, and moreover having a number of advantages in the manufacture.
  • the electric motor has been used for various electrical products, and as regards the air conditioner, in most cases, for its fan motor, there has been used an inner rotor type fan motor, in which a rotor is arranged inside a stator for generating a revolving magnetic field.
  • the rotor of this electric motor has a rotating shaft 1 and a permanent magnet 3 formed in a ring shape to be arranged coaxially to the rotating shaft 1 .
  • a rotational support (core) 2 having smaller outside diameter than an inside diameter of the permanent magnet 3 is fixed to the rotating shaft 1 .
  • a pair of left and right cushioning members 4 and 5 made of rubber are fitted in from the opposite side respectively along the axial direction of the rotating shaft 1 in such a manner that they sandwich the rotational support 2 therebetween from both sides and that they enter between the rotational support 2 and the permanent magnet 3 .
  • the cushioning members 4 and 5 expand by pressure to be given by the end plates 6 and 7 to be brought into tight contact with the rotational support 2 and the permanent magnet 3 so that the rotational shaft 1 and the permanent magnet 3 are integrally assembled.
  • the present invention it is possible to manufacture the electric motor at low cost by realizing vibration isolation, eccentricity and the like of the rotor with a small number of parts. It is also possible to easily cope with even resonance which occurs between the electric motor and a load without involving changes in the design to a large extent, and to obtain an electric motor excellent in adaptability to various products.
  • the present invention is characterized in that a rotor of an electric motor to be arranged inside a stator for generating a revolving magnetic field is provided with a permanent magnet formed in a ring shape; a rotating shaft arranged at the center of the permanent magnet; and a cushioning member made of rubber material having predetermined hardness, vulcanized and molded between the permanent magnet and the rotating shaft, characterized in that the permanent magnet and the rotating shaft are integrally coupled through the cushioning member.
  • a protruded portion which enters the cushioning member as an anchor.
  • the plurality of protruded portions may be provided at predetermined intervals circumferentially on the inner peripheral surface of the permanent magnet, or formed in a series of flange shape circumferentially on the inner peripheral surface of the permanent magnet.
  • joining of the permanent magnet and the rotating shaft to the cushioning member is preferably further reinforced by adhesive.
  • a joined state of the rotating shaft and the cushioning member can be further reinforced by baking means using, for example, high frequency.
  • the permanent magnet and the cushioning member, and the cushioning member and the rotating shaft are reliably joined respectively, and the permanent magnet and the rotating shaft are made integral through the cushioning member, and therefore, a rotating force of the permanent magnet is reliably transmitted to the rotating shaft, and strength capable of withstanding the rotating torque can be obtained.
  • the above-described cushioning member is provided with displacement absorbing means for absorbing displacement of the cushioning member.
  • the displacement absorbing means may be a plurality of through-holes formed in the cushioning member in parallel to the rotating shaft, or a plurality of recesses formed on both surfaces of the cushioning member, and in either case, absorbs displacement of the cushioning member to enhance the vibration isolation effect.
  • the above-described cushioning member there are applicable various rubber material such as, for example, nitrile rubber (NBR), ethylene-propylene rubber (EDPM), butyl rubber (IIR), and chloroprene rubber (CR), and of these, the chloroprene rubber is preferable, which is easily available at low price, and yet is excellent in resistance to climate, resistance to chemicals, mechanical characteristics, adhesion properties and formability.
  • NBR nitrile rubber
  • EDPM ethylene-propylene rubber
  • IIR butyl rubber
  • CR chloroprene rubber
  • a method for manufacturing a rotor of an electric motor according to the present invention is characterized in that a permanent magnet formed in a ring-shape in advance and a rotating shaft are concentrically arranged within a metal mold, thereafter, rubber material in fluid state is poured into space between the permanent magnet and the rotating shaft to vulcanize and mold a cushioning member having predetermined hardness, and the permanent magnet and the rotating shaft are integrally coupled through the cushioning member.
  • the permanent magnet is preferably of plastic magnet, and in this case, when the cushioning member is vulcanized and molded within space between the permanent magnet and the rotating shaft, the molding temperature is controlled to be equal to or less than temperature at which the plastic magnet does not become deformed.
  • the manufacturing method according to the present invention includes a first aspect of applying adhesive to both the inner peripheral surface of the permanent magnet and the rotating shaft, or either of them prior to vulcanizing and molding of the cushioning member, and a second aspect of further baking a joined portion between the rotating shaft and the cushioning member after vulcanizing and molding of the cushioning member.
  • FIG. 1 is a cross-sectional view schematically showing a rotor of an electric motor according to an embodiment of the present invention
  • FIG. 2 is a side view showing the rotor shown in FIG. 1;
  • FIG. 3 is a schematic cross-sectional view showing a metal mold device for use in a manufacturing method according to the present invention
  • FIG. 4 is a cross-sectional view schematically showing a conventional rotor of an electric motor.
  • FIG. 5 is a side view showing the rotor shown in FIG. 4.
  • the structure of the stator side for generating a revolving magnetic field has nothing direct to do with the gist of the present invention, and therefore, its illustration is omitted.
  • This rotor 10 is provided with a permanent magnet 11 formed in a ring shape; a rotating shaft 12 inserted through in the center thereof; and a cushioning member 13 made of rubber material having predetermined hardness, vulcanized and molded between the permanent magnet 11 and the rotating shaft 12 , characterized in that the permanent magnet 11 and the rotating shaft 12 are integrally coupled through the cushioning member 13 .
  • the permanent magnet 11 is made of plastic magnet, and on the inner peripheral surface thereof, there is formed a protruded portion 11 a which enters the cushioning member 13 as an anchor.
  • the plurality of protruded portions may be arranged at regular intervals circumferentially, or formed in a continuous flange shape.
  • the present invention does not exclude any permanent magnet made of metal, but the permanent magnet 11 may be made of metal.
  • the rotating shaft 12 may be merely cylindrical column-shaped, and has no rotational support (core) 2 unlike the conventional example shown in FIG. 4.
  • the chloroprene rubber (CR) is used because it is easily available at low price, and yet is excellent in resistance to climate, resistance to chemicals, mechanical characteristics, adhesion properties and formability.
  • the cushioning member 13 is formed by filling the space between the permanent magnet 11 and the rotating shaft 12 with chloroprene rubber in fluid state and vulcanizing.
  • the cushioning member 13 is provided with displacement absorbing means for absorbing any displacement of the cushioning member 13 .
  • the displacement absorbing means is shown as through-holes 13 a parallel to the rotating shaft 12 , and the plurality of through-holes are provided with predetermined intervals in a direction of the circumference of a circle with the rotating shaft 12 being centered.
  • a plurality of recesses may be formed respectively on both sides of the cushioning member 13 .
  • the description will be made of a method for manufacturing the rotor 10 .
  • the permanent magnet 11 formed in a ring shape in advance and the cylindrical column-shaped rotating shaft 12 will be concentrically set within a metal mold 15 .
  • the inner peripheral surface of the permanent magnet 11 and the surface of the rotating shaft 12 are kept coated with adhesive 14 .
  • a coating range of the adhesive 14 is only a place in contact with the cushioning member 13 .
  • chloroprene rubber which is material for the cushioning member 13 , is poured into space between the permanent magnet 11 and the rotating shaft 12 through a filler hole 15 a and is vulcanized to mold the cushioning member 13 .
  • temperature of the metal mold 15 and injection temperature of the molding material are preferably prevented from reaching deformation temperature of the plastic magnet, which is material of the permanent magnet 11 .
  • FIG. 3 does not show a through-hole 13 a as the displacement absorbing means
  • a pin is stood at a formation position of the through-hole 13 a on the metal mold 15 , and the through-hole 13 a is formed by the pin.
  • the through-hole 13 a (or a recess) may be formed by using, for example, a drill or the like.
  • the through-hole 13 a (or recess) of the cushioning member 13 the displacement of the cushioning member 13 itself is absorbed, and therefore, its vibration isolation effect can be enhanced.
  • the use of the above-described manufacturing method under temperature control does away with the need to perform subsequent processing by cutting and the like for truing up the outside diameter (external shape of the rotor) of the permanent magnet 11 . Accordingly, the manufacturing number of man-hours requires an exceedingly low one so that the manufacturing cost can be further reduced.
  • the hardness of the cushioning member 13 can be selected by empirically obtaining hardness, at which the vibration to be generated by the permanent magnet 11 during rotation can be absorbed most effectively. Also, when, for example, a fan is driven by an electric motor using this rotor 10 , the torsional frequency of the rotating shaft 12 is determined by the rotor 10 and its fan. According to the present invention, only by appropriately changing the hardness of the rubber material, it is possible to avoid the resonance phenomenon without the need for a change in design to a large extent. Therefore, it is possible to obtain an electric motor excellent in adaptability for various equipment.
  • a protruded portion 11 a is provided inside the permanent magnet 11 , and adhesive 14 is further used dually, and either of them may be omitted.
  • the rubber material of the cushioning member 13 can be baked to the rotating shaft 12 by applying the high frequency welding method (Induction Heating Method) between the metal mold 15 and the rotating shaft 12 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Motor Or Generator Frames (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US09/845,185 2000-05-17 2001-05-01 Rotor of electric motor and method for manufacturing the same Abandoned US20010048261A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/611,882 US7120986B2 (en) 2000-05-17 2003-07-03 Method of manufacturing rotor of electric motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000145560A JP2001327105A (ja) 2000-05-17 2000-05-17 電動機の回転子およびその製造方法
JP2000-145560 2000-05-17

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/611,882 Division US7120986B2 (en) 2000-05-17 2003-07-03 Method of manufacturing rotor of electric motor

Publications (1)

Publication Number Publication Date
US20010048261A1 true US20010048261A1 (en) 2001-12-06

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Family Applications (2)

Application Number Title Priority Date Filing Date
US09/845,185 Abandoned US20010048261A1 (en) 2000-05-17 2001-05-01 Rotor of electric motor and method for manufacturing the same
US10/611,882 Expired - Lifetime US7120986B2 (en) 2000-05-17 2003-07-03 Method of manufacturing rotor of electric motor

Family Applications After (1)

Application Number Title Priority Date Filing Date
US10/611,882 Expired - Lifetime US7120986B2 (en) 2000-05-17 2003-07-03 Method of manufacturing rotor of electric motor

Country Status (9)

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US (2) US20010048261A1 (zh)
EP (1) EP1156574B1 (zh)
JP (1) JP2001327105A (zh)
KR (1) KR100820176B1 (zh)
CN (1) CN1214505C (zh)
AU (1) AU784039B2 (zh)
DE (1) DE60124029T2 (zh)
MY (1) MY133927A (zh)
TW (1) TW533650B (zh)

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US20060244333A1 (en) * 2005-04-29 2006-11-02 Young-Chun Jeung Two-phase brushless DC motor
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US20080284274A1 (en) * 2006-01-31 2008-11-20 Zhongshan Broad-Ocean Motor Co., Ltd. Vibration-damping rotor assembly
US20080313884A1 (en) * 2007-05-11 2008-12-25 Young-Chun Jeung Method of making rotor of brushless motor
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US7685697B2 (en) 2001-01-09 2010-03-30 Black & Decker Inc. Method of manufacturing an electric motor of a power tool and of manufacturing the power tool
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US20160254735A1 (en) * 2015-02-26 2016-09-01 American Axle & Manufacturing, Inc. Brushless dc electric motor
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CN102570664A (zh) * 2012-01-19 2012-07-11 苏州正澳电器有限公司 一种电机转子及加工这种电机转子的方法
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CN103337685B (zh) * 2013-06-17 2015-03-11 华南理工大学 一种轻量型的自动对星天线防倾倒底座
TWI624318B (zh) * 2014-02-27 2018-05-21 保來得股份有限公司 燒結軸承
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EP3093960A1 (de) * 2015-05-11 2016-11-16 Siemens Aktiengesellschaft Rotor mit einem ringmagneten und einem kunststoffteil
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KR101891148B1 (ko) * 2017-10-30 2018-08-23 김호봉 롱형 코일 고정체 및 이중 자석 회전체를 가지는 개량된 고전압 발전기
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CN108448769A (zh) * 2018-05-25 2018-08-24 珠海格力电器股份有限公司 电机及其转子结构

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MY133927A (en) 2007-11-30
CN1324134A (zh) 2001-11-28
KR100820176B1 (ko) 2008-04-07
US20040045154A1 (en) 2004-03-11
CN1214505C (zh) 2005-08-10
US7120986B2 (en) 2006-10-17
AU4017401A (en) 2001-11-22
EP1156574A2 (en) 2001-11-21
KR20010105183A (ko) 2001-11-28
EP1156574B1 (en) 2006-10-25
DE60124029T2 (de) 2007-05-24
TW533650B (en) 2003-05-21
AU784039B2 (en) 2006-01-19
DE60124029D1 (de) 2006-12-07
EP1156574A3 (en) 2004-01-02
JP2001327105A (ja) 2001-11-22

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