US Patent No: 4,924,125

Number of patents in Portfolio can not be more than 2000

Electric motor or alternator

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ATTORNEY / AGENT: (SPONSORED)

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
CLARK AUTOMOTIVE DEVELOPMENTS LIMITEDWARKWORTH2

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Clark, Peter B Sandspit, NZ 3 97

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SONY CORPORATION (2)
4,217,508 DC motor 90 1978
4,417,167 DC Brushless motor 40 1981
 
EATON CORPORATION (1)
4,651,066 Ferrite permanent magnet electrical machine and the application thereof within vehicle traction drives 49 1984
 
Electro-Craft Corporation (1)
4,426,606 Emergency stop device for brushless motors 21 1982
 
HITACHI METALS, LTD. (1)
4,260,920 Multi-pole permanent magnet rotor 41 1978
 
INTEGRATED MOTOR TECHNOLOGIES, INC. (1)
4,733,118 Low damping torque brushless D.C. motor 74 1986
 
Kangyo Denkikiki Kabushiki Kaisha (1)
4,665,331 Brushless DC micromotor 33 1986
 
MAGNETI MARELLI UK LIMITED (1)
4,471,252 Rotary dynamo electric machine with protection against demagnetization of low flux portion of permanent magnet poles 15 1982
 
MOTOROLA, INC. (1)
4,692,631 Turbine alternator with a central clear optical path 21 1986
 
Nippondenso Co., Ltd. (1)
4,636,671 Magneto generator for internal combustion engine 12 1984
 
NORTHLAND/SCOTT FETZER COMPANY (1)
4,268,769 Motor for rotary brush 21 1978
 
ROBERT BOSCH GMBH (1)
4,418,296 Magneto-generator for engine ignition systems 6 1981
 
Societe Chauvin Arnoux (1)
4,303,843 Multiple magnetic flywheel driven by a centrifugal clutch 24 1980
 
STANDARD ELEKTRIK LORENZ AG (1)
4,638,201 Electronically commutated dc motor 30 1986
 
The Charles Stark Draper Laboratory, Inc. (1)
4,645,961 Dynamoelectric machine having a large magnetic gap and flexible printed circuit phase winding 63 1983
 
Other [Check patent profile for assignment information] (1)
4,438,342 Novel hybrid electric vehicle 65 1981

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
PRATT & WHITNEY CANADA CORP. (22)
6,664,705 Method of providing electric power with thermal protection 9 2001
7,119,467 Current limiting means for a generator 10 2003
6,920,023 Current limiting means for a generator 16 2003
7,119,461 Enhanced thermal conductivity ferrite stator 3 2003
6,965,183 Architecture for electric machine 45 2003
6,873,071 Method, apparatus and system for controlling an electric machine 7 2003
7,253,548 Method and apparatus for controlling an electric machine 0 2003
6,936,948 Electric machine having an integrally continuous stator winding and stator slot bridges 23 2003
7,262,521 Variable AC voltage regulation control method and apparatus 2 2003
7,098,561 Method of providing electric power with thermal protection 1 2004
7,262,539 Saturation control of electric machine 14 2004
7,309,939 Current limiting means for a generator 3 2005
7,126,313 Architecture for electric machine 32 2005
7,288,923 Voltage-limited electric machine 6 2006
7,545,056 Saturation control of electric machine 3 2006
7,312,550 Architecture for electric machine 4 2006
7,443,070 Method and apparatus for controlling an electric machine 1 2007
7,436,098 Current limiting means for a generator 1 2007
7,583,063 Architecture for electric machine 0 2007
7,656,067 Current limiting means for a generator 0 2008
7,709,980 Architecture for electric machine 1 2009
7,919,894 Architecture for electric machine 0 2010
 
HITACHI, LTD. (7)
6,734,592 Permanent magnet rotating electric machine and electrically driven vehicle employing same 13 2002
6,949,856 Permanent magnet rotating electric machine and electrically driven vehicle employing same 11 2004
7,417,349 Driving apparatus 4 2005
7,215,055 Vehicle 7 2005
7,196,447 Rotating electric machine 9 2005
7,671,502 Driving apparatus 2 2008
7,956,506 Driving apparatus 0 2009
 
Globe Products Inc. (3)
5,394,046 Stator and stator winding method and apparatus 7 1993
5,586,383 Stator winding method 7 1995
5,794,884 Stator winding apparatus with selectively movable coil former 8 1995
 
SEAGATE TECHNOLOGY LLC (2)
5,400,197 Disc drive spindle motor 8 1992
6,876,114 Apparatus for reducing spindle motor magnetic drag 5 2001
 
SHURFLO, LLC (2)
6,132,186 Impeller pump driven by a dynamo electric machine having a stator comprised of a mass of metal particles 12 1997
6,776,590 Dynamo electric machines and stators for use in same 3 2002
 
ALLIEDSIGNAL INC. (1)
6,242,840 Electrical machine including toothless flux collector made from ferromagnetic wire 26 1999
 
CADAC HOLDINGS LIMITED (1)
5,289,066 Stator for dynamoelectric machine 18 1991
 
EASTWAY FAIR COMPANY LIMITED (1)
7,159,497 Light beam alignment system 0 2002
 
EBM-PAPST MULFINGEN GMBH & CO. KG (1)
6,534,946 Synchronous AC motor 2 2001
 
EML RESEARCH, INC. (1)
5,229,677 Electric propulsion motor for marine vehicles 20 1991
 
GENERAC POWER SYSTEMS, INC. (1)
5,831,366 Permanent magnet alternator 26 1996
 
Meng-Yu Liu (1)
6,703,716 Permanent magnet generator for bicycle light operation 7 2001
 
MORALES, ROBERT (1)
6,192,821 Boat mounted hydro-alternator 2 1998
 
MOTEURS LEROY-SOMER (1)
7,692,354 Rotary electric machine with reduced torque ripple 1 2006
 
PERFECT GALAXY INTERNATIONAL LIMITED (1)
6,097,124 Hybrid permanent magnet/homopolar generator and motor 29 1997
 
RANCO INCORPORATED OF DELAWARE (1)
5,406,158 Miniature synchronous motor 6 1993
 
SCHLUMBERGER TECHNOLOGY CORPORATION (1)
5,448,227 Method of and apparatus for making near-bit measurements while drilling 96 1993
 
SHURFLO PUMP MANUFACTURING COMPANY, INC. (1)
6,034,465 Pump driven by brushless motor 12 1998
 
SUNONWEALTH ELECTRIC MACHINE INDUSTRY CO., LTD. (1)
6,608,411 Direct current brushless motor 9 2001
 
The United States of America as represented by the Secretary of the Army (1)
6,054,789 Cylindrical permanent magnet magic ring electric motor and generator 4 1998
 
Other [Check patent profile for assignment information] (4)
5,450,915 Electric motor-in-wheel 34 1993
6,366,037 Separately excited electric machine 1 2000
6,347,929 Dynamo electric machines and stators for use in same 7 2000
7,671,509 Rotor and stator assemblies for permanent magnet electric generator 1 2007