Electric motor or alternator

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4924125
SERIAL NO

07349939

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A permanent magnet rotary dynamo electric machine such as a high speed three phase brushless motor has at least one stator and at least one rotor spaced apart from one another by a cylindrical gap therebetween. A plurality of permanent magnetic poles are provided by a plurality of rare earth magnets positioned side by side on the inside of a cup shaped rotor and oriented parallel to the rotor axis. The stator has a plurality of wound poles of shallow depth which are wound on or close to the surface of a substrate of low magnetic permeability (less than 20 times that of air). The wound poles are positioned adjacent the cylindrical gap so as to intersect the magnetic flux paths between adjacent permanent magnetic poles.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Clark Automotive Developments LimitedWARKWORTH0

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Clark, Peter B Warkworth, NZ 3 102

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MAGNETI MARELLI UK LIMITED (1)
* 4471252 Rotary dynamo electric machine with protection against demagnetization of low flux portion of permanent magnet poles 15 1982
 
Other [Check patent profile for assignment information] (1)
* 4438342 Novel hybrid electric vehicle 75 1981
 
Electro-Craft Corporation (1)
* 4426606 Emergency stop device for brushless motors 24 1982
 
SOCIETE CHAUVIN ARNOUX (1)
* 4303843 Multiple magnetic flywheel driven by a centrifugal clutch 24 1980
 
ROBERT BOSCH GMBH (1)
* 4418296 Magneto-generator for engine ignition systems 6 1981
 
SONY CORPORATION (1)
* 4417167 DC Brushless motor 44 1981
 
THE CHARLES STARK DRAPER LABORATORY, INC. (1)
* 4645961 Dynamoelectric machine having a large magnetic gap and flexible printed circuit phase winding 68 1983
 
Kangyo Denkikiki Kabushiki Kaisha (1)
* 4665331 Brushless DC micromotor 33 1986
 
Nippondenso Co., Ltd. (1)
* 4636671 Magneto generator for internal combustion engine 13 1984
 
INTEGRATED MOTOR TECHNOLOGIES, INC. (1)
* 4733118 Low damping torque brushless D.C. motor 89 1986
 
STANDARD ELEKTRIK LORENZ AKTIENGESELLSCHAFT (1)
* 4638201 Electronically commutated dc motor 30 1986
 
MOTOROLA, INC. (1)
* 4692631 Turbine alternator with a central clear optical path 21 1986
 
EATON CORPORATION (1)
* 4651066 Ferrite permanent magnet electrical machine and the application thereof within vehicle traction drives 56 1984
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (6)
* 5450915 Electric motor-in-wheel 38 1993
* 6366037 Separately excited electric machine 5 2000
6347929 Dynamo electric machines and stators for use in same 7 2000
* 7671509 Rotor and stator assemblies for permanent magnet electric generator 2 2007
* 2009/0051,233 ROTOR AND STATOR ASSEMBLIES FOR PERMANENT MAGNET ELECTRIC GENERATOR 0 2007
* 2013/0225,360 Electric Drive for a Bicycle 3 2011
 
MORALES, ROBERT (1)
* 6192821 Boat mounted hydro-alternator 3 1998
 
HITACHI, LTD. (12)
* 6734592 Permanent magnet rotating electric machine and electrically driven vehicle employing same 16 2002
* 2002/0130,575 Permanent magnet rotating electric machine and electrically driven vehicle employing same 0 2002
* 6949856 Permanent magnet rotating electric machine and electrically driven vehicle employing same 14 2004
7417349 Driving apparatus 5 2005
* 7215055 Vehicle 7 2005
* 7196447 Rotating electric machine 13 2005
* 2006/0017,344 Rotating electric machine 0 2005
* 2006/0017,419 Vehicle 1 2005
7671502 Driving apparatus 3 2008
* 2008/0284,270 Driving Apparatus 1 2008
7956506 Driving apparatus 0 2009
* 2009/0309,449 Driving Apparatus 3 2009
 
RANCO INCORPORATED OF DELAWARE (1)
* 5406158 Miniature synchronous motor 6 1993
 
SANYO TECNICA CO., LTD. (1)
* 2006/0291,136 Lighting equipment 7 2006
 
AlliedSignal Inc. (1)
* 6242840 Electrical machine including toothless flux collector made from ferromagnetic wire 40 1999
 
PATENTVERWERTUNGSGESELLSCHAFT PaLiBa GmbH (2)
* 9685830 Electric motor having an iron-free winding 0 2014
* 2014/0217,846 Electric Motor Having an Iron-Free Winding 0 2014
 
SEAGATE TECHNOLOGY LLC (3)
* 5400197 Disc drive spindle motor 9 1992
* 6876114 Apparatus for reducing spindle motor magnetic drag 5 2001
* 2002/0070,616 Apparatus for reducing spindle motor magnetic drag 0 2001
 
MOTEURS LEROY-SOMER (2)
* 7692354 Rotary electric machine with reduced torque ripple 2 2006
* 2007/0126,308 Rotary electric machine with reduced torque ripple 1 2006
 
Globe Products Inc. (3)
* 5394046 Stator and stator winding method and apparatus 8 1993
* 5586383 Stator winding method 8 1995
* 5794884 Stator winding apparatus with selectively movable coil former 10 1995
 
SCHLUMBERGER TECHNOLOGY CORPORATION (1)
* 5448227 Method of and apparatus for making near-bit measurements while drilling 113 1993
 
EASTWAY FAIR COMPANY LIMITED (3)
* 7159497 Light beam alignment system 2 2002
* 2003/0140,758 Light beam alignment system 0 2002
* 2007/0107,573 Light beam alignment system 2 2007
 
The United States of America as represented by the Secretary of the Army (1)
* 6054789 Cylindrical permanent magnet magic ring electric motor and generator 5 1998
 
EML RESEARCH, INC. (1)
* 5229677 Electric propulsion motor for marine vehicles 21 1991
 
LIU, MENG-YU (1)
* 2003/0071,464 Generator for a bicycle 0 2001
 
POSTECH ACADEMY-INDUSTRY FOUNDATION (2)
* 9356546 Sensorless control method for motor and system using the same 0 2014
* 2015/0365,029 SENSORLESS CONTROL METHOD FOR MOTOR AND SYSTEM USING THE SAME 1 2014
 
SUNONWEALTH ELECTRIC MACHINE INDUSTRY CO., LTD. (1)
* 6608411 Direct current brushless motor 9 2001
 
PRATT & WHITNEY CANADA CORP. (35)
* 6664705 Method of providing electric power with thermal protection 11 2001
7119467 Current limiting means for a generator 11 2003
6920023 Current limiting means for a generator 16 2003
* 2004/0184,204 Current limiting means for a generator 0 2003
7119461 Enhanced thermal conductivity ferrite stator 3 2003
* 2004/0189,108 Enhanced thermal conductivity ferrite stator 16 2003
6965183 Architecture for electric machine 54 2003
* 2004/0239,202 Architecture for electric machine 4 2003
6873071 Method, apparatus and system for controlling an electric machine 8 2003
* 2004/0245,869 Method, apparatus and system for controlling an electric machine 1 2003
7253548 Method and apparatus for controlling an electric machine 0 2003
* 2004/0251,765 Method and apparatus for controlling an electric machine 0 2003
* 2004/0103,520 Method of providing electric power with thermal protection 0 2003
6936948 Electric machine having an integrally continuous stator winding and stator slot bridges 47 2003
7262521 Variable AC voltage regulation control method and apparatus 3 2003
* 2005/0146,307 Variable AC voltage regulation control method and apparatus 0 2003
7098561 Method of providing electric power with thermal protection 1 2004
7262539 Saturation control of electric machine 16 2004
* 2006/0113,967 SATURATION CONTROL OF ELECTRIC MACHINE 2 2004
7309939 Current limiting means for a generator 4 2005
* 2005/0184,615 Current limiting means for a generator 0 2005
7126313 Architecture for electric machine 41 2005
* 2005/0242,785 Architecture for electric machine 1 2005
7288923 Voltage-limited electric machine 6 2006
7545056 Saturation control of electric machine 3 2006
* 2006/0226,721 SATURATION CONTROL OF ELECTRIC MACHINE 24 2006
7312550 Architecture for electric machine 6 2006
* 2007/0024,249 ARCHITECTURE FOR ELECTRIC MACHINE 2 2006
7443070 Method and apparatus for controlling an electric machine 1 2007
7436098 Current limiting means for a generator 2 2007
7583063 Architecture for electric machine 18 2007
7656067 Current limiting means for a generator 0 2008
* 2008/0315,706 CURRENT LIMITING MEANS FOR A GENERATOR 2 2008
7709980 Architecture for electric machine 2 2009
7919894 Architecture for electric machine 5 2010
 
CADAC HOLDINGS LIMITED (1)
* 5289066 Stator for dynamoelectric machine 19 1991
 
GENERAC POWER SYSTEMS, INC. (1)
* 5831366 Permanent magnet alternator 31 1996
 
SHURflo, LLC (2)
* 6132186 Impeller pump driven by a dynamo electric machine having a stator comprised of a mass of metal particles 14 1997
6776590 Dynamo electric machines and stators for use in same 5 2002
 
SHURFLO PUMP MANUFACTURING COMPANY, INC. (1)
* 6034465 Pump driven by brushless motor 20 1998
 
DENSO CORPORATION (2)
* 8860281 Multiple-gap electric rotating machine 3 2012
* 2013/0119,789 MULTIPLE-GAP ELECTRIC ROTATING MACHINE 0 2012
 
EBM-PAPST MULFINGEN GMBH & CO. KG (1)
* 6534946 Synchronous AC motor 3 2001
 
Meng-Yu Liu (1)
* 6703716 Permanent magnet generator for bicycle light operation 9 2001
 
PERFECT GALAXY INTERNATIONAL LIMITED (1)
* 6097124 Hybrid permanent magnet/homopolar generator and motor 32 1997
* Cited By Examiner