• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A rotor disc (14), for use in an electrical machine (10), has at least one circumferential rotor rim (16) mounted thereon. The rotor rim (16) comprises at least one row of alternate magnets (20) and laminated pole pieces (18). The laminations in each pole piece (18) are mounted concentrically on a bolt (22) that extends through the rotor disc (14). A clearance (23) is provided between the laminations in each pole piece (18) and the bolt (22). The clearance (23) insulates the bolt (22) from the laminated pole pieces (18), which are made from a ferromagnetic material such as silicon—iron alloy, to minimize power losses due to eddy currents.
    公开号:US20010008356A1
    申请号:US09/755,114
    申请日:2001-01-08
    公开日:2001-07-19
    发明作者:Geoffrey Wilkin
    申请人:Rolls Royce PLC；
    IPC主号:H02K1-27
    专利说明:
    [0001] The present invention relates to a rotor disc for use in an electrical machine and in particular to the construction of an active rim on the rotor disc. [0001]
    [0002] Electrical machines, which operate in accordance with transverse flux principles, consist of an armature winding in the form of a circular coil co-axial with a rotor. The rotor consists of one or more active rims comprising a multiplicity of magnets and laminated poles, fastened to the disc. The armature winding links the flux generated by the permanent magnets mounted on the rim of the rotor disc by means of a series of stator cores. [0002]
    [0003] The rotor disc may support several rotor rims typically arranged in pairs on opposite sides of the disc. Each rotor rim is circumferential and consists of a single row of magnets and pole pieces. [0003]
    [0004] European patent 0779695-B, in the name of Rolls-Royce Power Engineering plc, describes an arrangement in which the laminations in each pole piece are clamped by one or more bolts. The bolts pass through the lamination stack and the rotor disc. It is necessary for the rotor poles, which are made from a ferromagnetic material such as silicon—iron alloy, to be electrically insulated from the bolts passing through them to minimise power losses due to eddy currents. [0004]
    [0005] Conventional methods of achieving the required insulation include providing an insulating coating on the surface of the bolt or sheathing the bolt with an insulated tube. The application of a coating to the bolt is expensive whilst the sheath may be damaged during installation and requires an additional assembly clearance which adversely affects build accuracy. [0005]
    [0006] The present invention seeks to provide an insulated pole piece, which is not expensive to produce, has adequate insulation integrity and which more accurately locates the pole piece relative to the disc. [0006]
    [0007] According to the present invention a rotor disc for use in an electrical machine has at least one circumferential rotor rim mounted thereon, the rotor rim comprises at least one row of alternate magnets and laminated pole pieces, the laminations in each pole piece being supported by at least one bolt which extends through the rotor disc, a clearance being provided between the laminations and the bolt passing therethrough. The clearance insulates the bolt from the laminations in each pole piece. [0007]
    [0008] Preferably the laminations are mounted concentrically on the bolt in a radially spaced relationship to provide the insulating clearance. This eases assembly of the rotor rim, as a close fit is not required between the laminated pole pieces and the bolt. [0008]
    [0009] The laminations may be bonded together to form a stack, the stack of bonded laminations being mounted concentrically on the bolt in a radially spaced relationship. Bonding the laminations into a stack gives a discrete component that is easier to assemble. [0009]
    [0010] In the preferred embodiment of the present invention the stack of bonded laminations is mounted concentrically on the bolt in a radially spaced relationship by the provision of insulated annular members at either end of the stack. The insulated annular members may be recessed into either end to minimise the insulating clearance over most of the stack length and ease assembly with small radial clearances. [0010]
    [0011] Preferably the insulated annular members are resilient and are formed from an elastomeric material, which allows them to be pressed into the recesses and ensures accurate location of the pole piece relative to the rotor disc. [0011]
    [0012] The laminated pole pieces may be compressed. Preferably resilient means, such as nuts and sprung washers, are provided on the bolt for compressing the laminated pole pieces. The nuts and spring washers maintain the correct compressive force on the laminated pole pieces throughout operation. [0012]
    [0013] The present invention will now be described with reference to the accompanying drawings in which; [0013]
    [0014] FIG. 1 is a cross-sectional view of a transverse flux motor having a rotor constructed in accordance with the present invention. [0014]
    [0015] FIG. 2 is an enlarged view of part of one of the rotor rims shown in FIG. 1 having laminated pole pieces. [0015]
    [0016] FIG. 3 is an enlarged cross-sectional view through one of the laminated pole pieces shown in FIG. 2 mounted in accordance with the present invention. [0016]
    [0017] Referring to FIG. 1 a transverse flux motor, generally indicated at [0017] 10 comprises a rotor and a stator assembly.
    [0018] The rotor assembly has four rotor discs [0018] 14 bolted to flanges 13 on a hollow shaft 12. Each disc 14 has four circumferential rotor rims 16 that support the active rotor components for four motor phases.
    [0019] Each rim [0019] 16 consists of a single row of alternate pole pieces 18 and permanent magnets 20, FIG. 2. Suitable magnet materials are the high-energy rare earth magnet materials such as samarium cobalt and neodymium iron boron.
    [0020] The pole pieces [0020] 18 are laminated and pre-bonded into a stack. Pre-bonding the laminations into a stack gives a discrete component that is easier to assemble onto the rotor 14. A bolt 22 passes through bolthole 21 to fasten the stack of laminations to the rotor disc 14, FIG. 3.
    [0021] A compressive force is applied to the laminated pole piece [0021] 18 via two annular members 24 and 26 made from glass reinforced plastic. The outer annular member 26 is tightened down using nuts 28 and a number of sprung washers 30.
    [0022] The sprung washers [0022] 30 are resilient so that the correct compressive force is maintained on the pole piece 18 regardless of relaxation in the stack of laminations and differential expansion of the rotor components. Retaining a compressive force on the laminated stack maintains the required structural stiffness and minimises deflections in the pole pieces 18 when in operation.
    [0023] The pole pieces [0023] 18 are mounted concentrically on the bolt 22 in a radially spaced relationship so that a clearance 23 is created between the bolt 22 and the pole pieces 18. The clearance 23 acts to insulate the bolt 22 from the pole pieces 18, which are made from a ferromagnetic material such as silicon—iron alloy.
    [0024] The pole pieces [0024] 18 are mounted in a radially spaced relationship with the bolt 22 by insulated annular members 27 located at either end. In the preferred embodiment of the present invention the annular members 27 are O-rings which are formed from a resilient material such as an elastomer. The O-rings 27 are self-centring and ensure that the laminations remain concentric.
    [0025] The O-rings [0025] 27 are recessed into the ends of the pole pieces 18 to maintain a small clearance 23 between the bolt 22 and the pole pieces 18. Only a small clearance 23 is required due to the modest electrical insulation requirements. The clearance 23 need only insulate against a voltage of the order of 1 volt in order to limit the power loss due to eddy currents. In the preferred embodiment of the present invention a clearance 23 of the order of 0.25 mm is sufficient to insulate against a voltage of 1 volt whilst giving sufficient clearance to meet the demanding shock and vibration requirements of the transverse flux motor.
    [0026] An arrangement in accordance with the present invention offers the advantages that it is easier to assemble, it offers good and reliable concentricity whilst eliminating the need for tight tolerances. [0026]
    权利要求:
    Claims (10)
    [1" id="US-20010008356-A1-CLM-00001] 1. A rotor disc for use in an electrical machine has at least one circumferential rotor rim mounted thereon, the rotor rim comprising at least one row of alternate magnets and laminated pole pieces, the laminations in each pole piece being supported by at least one bolt which extends through the rotor disc, a clearance gap being provided to electrically insulate the laminations from the bolt passing therethrough.
    [2" id="US-20010008356-A1-CLM-00002] 2. A rotor disc as claimed in
    claim 1 in which the clearance is provided by mounting the laminations concentrically on the bolt in a radially spaced relationship.
    [3" id="US-20010008356-A1-CLM-00003] 3. A rotor disc as claimed in
    claim 1 in which the laminations are bonded together to form a stack.
    [4" id="US-20010008356-A1-CLM-00004] 4. A rotor disc as claimed in
    claim 3 in which the stack of bonded laminations is mounted concentrically on the bolt in a radially spaced relationship by the provision of annular members which are insulated at either end of the stack.
    [5" id="US-20010008356-A1-CLM-00005] 5. A rotor disc as claimed in
    claim 4 in which the insulated annular members are recessed into either end of the stack.
    [6" id="US-20010008356-A1-CLM-00006] 6. A rotor disc as claimed in
    claim 4 in which the insulated annular members are resilient.
    [7" id="US-20010008356-A1-CLM-00007] 7. A rotor disc as claimed in
    claim 6 in which the annular members are formed from an elastomeric material.
    [8" id="US-20010008356-A1-CLM-00008] 8. A rotor disc as claimed in
    claim 1 in which means are provided on the bolt for compressing the laminated pole pieces.
    [9" id="US-20010008356-A1-CLM-00009] 9. A rotor disc as claimed in
    claim 8 in which the means for compressing the laminated pole pieces is resilient to maintain the correct compressive force on the laminated pole pieces throughout operation.
    [10" id="US-20010008356-A1-CLM-00010] 10. A rotor disc as claimed in
    claim 9 in which the means for compressing the laminated pole pieces are nuts and sprung washers.
    类似技术:
    公开号 | 公开日 | 专利标题
    US6741010B2|2004-05-25|Rotor disc assembly having rotor rim with alternate magnets and laminated pole pieces
    US3531670A|1970-09-29|Rotary electrical apparatus having metallic sleeve for embracing the peripheral sections of permanent magnet rotor
    US7030529B2|2006-04-18|Electrical machines, especially engines excited by permanent magnets
    KR100898202B1|2009-05-18|Stator and motor, to which the stator is applied, and method of manufacturing the stator
    US6259180B1|2001-07-10|Motor including embedded permanent magnet rotor and method for making the same
    US20070247017A1|2007-10-25|Axial-Flux, Permanent Magnet Electrical Machine
    EP0779696B1|2000-01-12|Rotor disc
    EP1708341A2|2006-10-04|System and method for magnetization of permanent magnet rotors in electrical machines
    US20090009012A1|2009-01-08|Assembly and method for magnetization of permanent magnet rotors in electrical machines
    KR101618717B1|2016-05-09|Method for mounting a magnetic pole and associated rotor
    WO2007025180A1|2007-03-01|A device and method to clamp and lock permanent magnets and improve cooling within a rotating electrical machine
    US20170117763A1|2017-04-27|Axial flux machine
    US20120248916A1|2012-10-04|Magent retaining arrangements
    US5886449A|1999-03-23|Electrical machine
    JP2001119872A|2001-04-27|Synchronous rotating electric machine, wind turbine power generator, and manufacturing methods for them
    WO2013116506A1|2013-08-08|Electric machines and methods of making same
    JPH0638418A|1994-02-10|Axial-gap rotating electric machine
    KR101707389B1|2017-02-15|Rotor for an electrical machine
    EP0762618B1|1999-07-14|Transverse flux electrical machine
    WO2007083724A1|2007-07-26|Gap winding type motor
    US3462627A|1969-08-19|Annular rotor supporting structure for a synchronous machine
    US20070001539A1|2007-01-04|Device for an electrical machine
    EP0779695B1|1999-10-20|Rotor disc
    JPH05219666A|1993-08-27|Stator for rotating electric machine
    JP2006121814A|2006-05-11|Linear motor
    同族专利:
    公开号 | 公开日
    EP1122859A2|2001-08-08|
    GB0001121D0|2000-03-08|
    EP1122859A3|2002-01-02|
    EP1122859B1|2006-08-30|
    US6741010B2|2004-05-25|
    DE60030402T2|2006-12-14|
    DE60030402D1|2006-10-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3200275A|1960-01-20|1965-08-10|Electrolux Ab|Electric motor housings|
    US3447010A|1966-06-08|1969-05-27|Emerson Electric Co|Hermetic motor stator with insulated mounting bolts|
    US3445698A|1967-06-29|1969-05-20|Reliance Electric & Eng Co|Dynamoelectric machine with junction box on yoke and end bell|
    US3590292A|1969-11-28|1971-06-29|American Mach & Foundry|Electric motor construction|
    US3693035A|1970-09-15|1972-09-19|Black & Decker Mfg Co|Double insulated field mounting for universal motor|
    US3832581A|1972-03-31|1974-08-27|G Jack|Multi-armature and concentric motors|
    US3992641A|1974-11-22|1976-11-16|Westinghouse Electric Corporation|Polyphase disc reluctance motor|
    US4260920A|1977-09-19|1981-04-07|Hitachi, Ltd.|Multi-pole permanent magnet rotor|
    US4208600A|1978-04-21|1980-06-17|General Electric Company|Disk/drum acyclic machine|
    US4306168A|1978-10-31|1981-12-15|Emerson Electric Co.|System and method of securing end shields to the stator assembly of a dynamolelectric machine|
    US4510680A|1982-12-27|1985-04-16|General Electric Company|Method of making a permanent magnet rotor|
    US4477745A|1983-12-15|1984-10-16|Lux Gregory F|Disc rotor permanent magnet generator|
    US5027026A|1988-04-12|1991-06-25|Kabushiki Kaisha Sankyo Seiki Seisakusho|Brushless motor|
    US5162686A|1989-11-27|1992-11-10|Gec Alsthom Sa|Motor rotor having magnets|
    US5619087A|1992-03-18|1997-04-08|Kabushiki Kaisha Toshiba|Axial-gap rotary-electric machine|
    US5396140A|1993-05-28|1995-03-07|Satcon Technology, Corp.|Parallel air gap serial flux A.C. electrical machine|
    US5608281A|1994-11-07|1997-03-04|U.S. Philips Corporation|Induction motor|
    US5811908A|1995-05-02|1998-09-22|Oppama Industry Co. Ltd.|Magneto electric generator rotor and an implement for removing this rotor|
    US5877578A|1995-12-14|1999-03-02|Rolls-Royce Power Engineering Plc|Rotor disc construction for use in an electrical machine|
    US5894183A|1996-10-29|1999-04-13|Caterpillar Inc.|Permanent magnet generator rotor|
    US6181048B1|1996-12-11|2001-01-30|Smith Technology Development|Method for selectively coupling layers of a stator in a motor/generator|
    US5952755A|1997-03-18|1999-09-14|Electric Boat Corporation|Permanent magnet motor rotor|
    US6384504B1|1997-08-27|2002-05-07|Magnet-Motor Gesellschaft Für Magnetmotorische Technik Mbh|Electric machine with a rotor constructed of permanent magnets and magnetic flux guides|
    US6051905A|1998-09-17|2000-04-18|Clark; Richard|Homopolar generator|
    US6603232B2|2001-11-02|2003-08-05|Electric Boat Corporation|Permanent magnet retaining arrangement for high speed rotors|US20100052467A1|2008-08-29|2010-03-04|Hamilton Sundstrand Corporation|Transverse flux machine|GB460040A|1935-07-25|1937-01-20|Andrew Allison|Improvements in and connected with the laminated magnetic cores used in dynamo electric machinery|
    JPS6218939A|1985-07-18|1987-01-27|Matsushita Refrig Co|Structure of installation of electric motor for compressor|
    JPS62193537A|1986-02-17|1987-08-25|Fanuc Ltd|Permanent field rotor|
    GB9525545D0|1995-12-14|1996-02-14|Rolls Royce Power Eng|Rotor disc|
    JPH11266555A|1998-03-16|1999-09-28|Toshiba Corp|Rotor for rotary electric machine|
    GB0001121D0|2000-01-19|2000-03-08|Rolls Royce Plc|Rotor disc|GB0001121D0|2000-01-19|2000-03-08|Rolls Royce Plc|Rotor disc|
    DE10057633A1|2000-11-21|2002-06-06|Bosch Gmbh Robert|Anchor and method of making an anchor|
    EP1490942A1|2002-04-01|2004-12-29|Nissan Motor Company, Limited|Stator mounting for a double rotor electric motor|
    US8004127B2|2002-12-06|2011-08-23|Foster-Miller, Inc.|Rotary reluctance motor|
    CA2421606C|2003-03-06|2011-06-14|General Electric Canada Inc.|Insulated core stud for rotor and stator laminations|
    US7081696B2|2004-08-12|2006-07-25|Exro Technologies Inc.|Polyphasic multi-coil generator|
    KR101045647B1|2004-10-05|2011-07-01|엘지전자 주식회사|Motor Bracket Fastening Structure|
    JP4010319B2|2005-02-09|2007-11-21|ダイキン工業株式会社|Core and rotor, motor and compressor|
    US7285890B2|2005-03-30|2007-10-23|Comprehensive Power, Inc.|Magnet retention on rotors|
    US20060255679A1|2005-05-13|2006-11-16|Dine Pieter V|Apparatus for pole pieces|
    US7358637B2|2005-11-04|2008-04-15|Canopy Technologies, Llc|Method of compressing lamination stacks for permanent magnet rotor|
    AU2007257187A1|2006-06-08|2007-12-13|Exro Technologies Inc.|Poly-phasic multi-coil generator|
    US7816830B2|2007-08-16|2010-10-19|Gary Dickes|Permanent magnet alternator with segmented construction|
    US20080100166A1|2006-10-26|2008-05-01|Deere & Company|Motor having stator with generally planar windings|
    US8558425B2|2006-10-26|2013-10-15|Deere & Company|Motor having stator with generally planar windings|
    US7919898B2|2007-06-21|2011-04-05|Nidec Motor Corporation|Rotor core assembly for electric motor|
    BRPI0813185A2|2007-07-09|2014-12-23|Clearwater Holdings Ltd|ELECTROMAGNETIC MACHINE WITH REMOVABLE INDEPENDENT COILS, MODULAR PARTS AND SELF-SUSTAINABLE PASSIVE MAGNETIC BEARING|
    DE102008000979A1|2008-04-03|2009-10-08|Robert Bosch Gmbh|Electric machine|
    ITFI20080166A1|2008-09-03|2010-03-04|Leonardo Lenzi|METHOD FOR THE PRODUCTION OF THE STATOR OF AN ELECTRIC MACHINE.|
    EP2340602B1|2008-09-26|2019-01-02|Clearwater Holdings, Ltd.|Permanent magnet operating machine|
    DE102008043661A1|2008-11-12|2010-05-20|Robert Bosch Gmbh|Shaft for an electric machine, in particular for a motor generator|
    US8319380B2|2009-09-25|2012-11-27|Siemens Industry, Inc.|Method of tuning bending and torsion stiffness of ducted rotor core of an induction motor|
    JP5507967B2|2009-11-09|2014-05-28|株式会社日立製作所|Rotating electric machine|
    DE102012215241A1|2012-08-28|2014-03-06|Siemens Aktiengesellschaft|Rotor of an electric machine and electric machine|
    DE102012215236A1|2012-08-28|2014-03-06|Siemens Aktiengesellschaft|Rotor of an electric machine and electric machine|
    WO2014099901A1|2012-12-17|2014-06-26|Active Power, Inc.|Systems and methods for securing a rotor apparatus|
    US10505412B2|2013-01-24|2019-12-10|Clearwater Holdings, Ltd.|Flux machine|
    JP6121967B2|2014-10-02|2017-04-26|ファナック株式会社|Rotor with balancer weight and motor|
    CA3061619A1|2017-05-23|2018-11-29|Dpm Technologies Inc.|Variable coil configuration system control, apparatus and method|
    CN111357069A|2017-09-08|2020-06-30|清水控股有限公司|System and method for enhancing electrical storage|
    法律状态:
    2001-01-08| AS| Assignment|Owner name: ROLLS-ROYCE PLC, ENGLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WILKIN, GEOFFREY ALAN;REEL/FRAME:011433/0305 Effective date: 20001130 |
    2007-10-15| FPAY| Fee payment|Year of fee payment: 4 |
    2011-11-18| FPAY| Fee payment|Year of fee payment: 8 |
    2015-12-31| REMI| Maintenance fee reminder mailed|
    2016-05-25| LAPS| Lapse for failure to pay maintenance fees|
    2016-06-20| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2016-07-12| FP| Lapsed due to failure to pay maintenance fee|Effective date: 20160525 |
    优先权:
    申请号 | 申请日 | 专利标题
    GB0001121.3||2000-01-19||
    GB0001121A|GB0001121D0|2000-01-19|2000-01-19|Rotor disc|
    GB0001121||2000-01-19||
    [返回顶部]