Magnetically enhanced stepping motor

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4763034
SERIAL NO

07072213

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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The electric motor includes a mover, which may be a rotor or actuator, and a stator having a number of poles projecting toward the mover. The poles have soft-magnetic teeth projecting toward the mover and extending transverse to the direction of mover movement, and the mover has soft-magnetic teeth projecting toward the stator teeth and extending transverse to the direction of mover movement. Windings energize the stator to move the mover. Dividing each pole transverse to the direction of mover movement to define two pole portions per pole, and locating permanent magnetic material between stator teeth in only one portion of each of the poles, enhances the motor torque while achieving a saving of permanent magnetic material. Preferably the magnetic material exists on alternate pole portions in successive poles.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SIGMA INSTRUMENTS, INC.TOKYO2

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gamble, John G Hull, MA 9 85

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Aupac Co., Ltd. (1)
* 4564778 DC Brushless electromagnetic rotary machine 32 1984
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (1)
* 5327069 Switched reluctance machine including permanent magnet stator poles 54 1992
 
TRITEX CORPORATION (1)
* 2007/0222,320 Molded rotor assembly for electric motors 3 2005
 
Other [Check patent profile for assignment information] (5)
* 4972112 Brushless DC motor 25 1989
* 7615905 Hybrid electric reluctance motor 1 2004
* 2008/0030,092 Hybrid Electric Reluctance Motor 4 2004
* 9270144 High torque low inductance rotary actuator 0 2013
* 2013/0181,549 High Torque Low Inductance Rotary Actuator 4 2013
 
JAPAN SERVO CO., LTD. (4)
* 6051898 Stepping motor having external rotor and electromagnetic-combined-permanent-magnet stator 8 1998
* 6359349 Composite type three phase stepping motor 5 2000
* 6731033 Motor-driven system with stator provided with inductors 5 2001
* 2002/0024,267 Motor-driven system with stator provided with inductors 0 2001
 
ROCKWELL COLLINS, INC. (4)
* 6320284 Motor assembly allowing output in multiple degrees of freedom 20 1999
6664666 Motor assembly allowing output in multiple degrees of freedom 21 2001
6909205 Motor assembly allowing output in multiple degrees of freedom 22 2003
* 2004/0124,717 Motor assembly allowing output in multiple degrees of freedom 2 2003
 
ROBERT BOSCH GMBH (1)
* 2010/0102,663 ELECTRICAL MACHINE 0 2007
 
MOOG INC. (4)
9006941 Permanent magnet motor having teeth with fingers 6 2008
* 2011/0156,506 PERMANENT MAGNET-TYPE STEPPING MOTORS 0 2008
* 8970083 Stepping motors with small step intervals 0 2009
* 2011/0198,950 STEPPING MOTORS WITH SMALL STEP INTERVALS 1 2009
 
KOLLMORGEN CORPORATION (1)
* 2008/0030,108 Hybrid stepper motor having magnetic enhancement and heat dissipating housing 1 2006
 
PRATT & WHITNEY CANADA CORP. (28)
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
6965183 Architecture for electric machine 54 2003
* 2004/0239,202 Architecture for electric machine 4 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
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
7948139 Magnetic control circuit separation slit 0 2006
* 2007/0267,931 MAGNETIC CONTROL CIRCUIT SEPARATION SLIT 3 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 29 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
8339007 Magnetic control circuit separation slit 0 2011
 
FORD GLOBAL TECHNOLOGIES, INC. (1)
* 6531799 Hybrid electric machine with two rotors, permanent magnet poles and controllable field current 50 1999
 
SEIKO PRECISION INC. (1)
* 6900559 Rotor magnet, motor and stepping motor 3 2001
 
PACIFIC SCIENTIFIC COMPANY (4)
* 4922604 Method of fabricating an encapsulated motor 47 1989
* 5008572 Encapsulated motor with precision bearing registration 56 1990
* 5806169 Method of fabricating an injected molded motor assembly 111 1995
* 6020661 Injection molded motor assembly 71 1998
* Cited By Examiner