Multi-pole permanent magnet rotor

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4260920
SERIAL NO

05943124

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A disk-shaped magnet attached to a rotary shaft is circumferentially segmented into a plurality of segments which are magnetized to form driving magnetic poles. A plurality of velocity detecting magnetic poles are also arranged on the disk-shaped magnet concentrically to the driving magnetic poles. The number of the velocity detecting magnetic poles is larger than the number of the driving magnetic poles to increase the frequency of an output signal of a velocity detecting coil which interlinks with the velocity detecting magnetic poles so that a response speed of a velocity control circuit is increased.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO14066
HITACHI METALS, LTD.TOKYO1287

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nakamura, Tsutomu Toyokawa, JP 223 2253
Umehara, Teruo Hanyu, JP 16 323

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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (3)
* 4369388 Direct current motor with non-superposed armature windings 6 1981
* 5332374 Axially coupled flat magnetic pump 40 1992
* 6762527 DC brushless motor 6 2003
 
CANON SEIKI KABUSHIKI KAISHA (2)
* 4902924 Brushless motor 6 1987
* 5101131 Brushless motor 10 1989
 
TRW AUTOMOTIVE U.S. LLC (1)
6876167 Method and apparatus for determining the rotational rate of a rotating device 10 2003
 
SONY CORPORATION (2)
* 4695795 Rotation sensor with co-planar velocity and position responsive elements 20 1984
* 4639648 Three-phase brushless motor 19 1986
 
LG INNOTEK CO., LTD. (1)
* 2013/0020,916 ANTI-SEPARATING STRUCTURE OF SENSING MAGNET FOR EPS MOTOR 0 2012
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 5126613 Coil pattern of frequency generator 8 1990
 
PAPST LICENSING GMBH (1)
* 5361010 Tachogenerator for speed control of electric motors 6 1987
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (3)
* 7656259 Precise multi-pole magnetic component 0 2005
* 2006/0038,646 Precise multi-pole magnetic component and manufacturing method thereof 0 2005
7884690 Precise multi-pole magnetic component 0 2009
 
Applied Motion Products, Inc. (1)
* 4488076 Tachometer assembly for magnetic motors 10 1982
 
CANON KABUSHIKI KAISHA (4)
* 4801830 Brushless motor 26 1987
* 4902923 Motor having frequency generator 19 1988
* 7312543 Driving device 0 2006
* 2006/0267,421 Driving device 1 2006
 
Clark Automotive Developments Limited (1)
* 4924125 Electric motor or alternator 57 1989
 
KUMAGAYA SEIMITSU CO., LTD. (1)
* 4755701 Brushless motor having a frequency signal generator and a pulse signal generator 12 1987
 
DYMAX CORPORATION (1)
* 4479388 Ultrasound transducer and drive system 29 1982
 
U.S. PHILIPS CORPORATION (1)
* 4626727 Flat, permanent magnet electric motor 33 1984
 
SIEMENS AKTIENGESELLSCHAFT (1)
* 6759773 Electronically controlled electric motor provided for use in an environment containing solvents 0 2001
 
ALPS ELECTRIC CO., LTD. (4)
* 4455516 Brushless motor 21 1982
* 4737675 Brushless motor with center leads for preventing signal distortion 11 1986
* 4701649 Brushless motor with symmetrical leads for preventing signal distortion 5 1986
* 4701650 Brushless motor with phase cancelling leads for rotational speed detector pattern 8 1986
 
ROLLS-ROYCE PLC (2)
* 6741010 Rotor disc assembly having rotor rim with alternate magnets and laminated pole pieces 18 2001
* 2001/0008,356 Rotor disc 0 2001
 
Buehler Products, Inc. (1)
* 4578606 Brushless DC electric motor and tachogenerator assembly 24 1984
 
AMOTECH CO., LTD. (1)
* 6064133 Built-in stator of star-winding mechanism and method of producing the stator and BLDC motor using the same 5 1998
 
CITIZEN ELECTRONICS CO., LTD. (1)
* 6744904 Multifunction acoustic device 4 2001
 
SUNONWEALTH ELECTRIC MACHINES CO., LTD. (2)
* 6940236 Parallel connected double-phase full-wave brushless dc motor 0 2003
* 2004/0239,267 Parallel connected double-phase full-wave brushless dc motor 0 2003
 
EASTMAN KODAK COMPANY (1)
* 5686769 Method of coil mounting for maximum heat transfer in brushless DC motors 2 1995
 
ASAHI KASEI KABUSHIKI KAISHA (1)
* 4658162 Printed coil unit for small size actuator 42 1985
 
Asgalium S.A. (1)
* 4677332 Electric motor having auxiliary portions distributed at a pitch which is an odd number sub-multiple of the pitch of active portions 31 1985
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
* 4329636 Rotation sensor device 28 1979
 
SONCEBOZ SA (3)
* 8222777 Rotary single-phase electromagnetic servo actuator comprising an actuator and a position sensor 4 2006
* 2008/0197,728 Rotary Single-Phase Electromagnetic Servo Actuator Comprising an Actuator and a Position Sensor 5 2006
8502426 Rotary single-phase electromagnetic servo actuator comprising an actuator and a position sensor 0 2012
 
HIWIN MIKROSYSTEM CORP. (1)
* 2012/0229,123 MAGNETIC RING ENCODING DEVICE FOR COMPOSITE SIGNALS 0 2011
 
COMAIR ROTRON, INC. (2)
* 4494028 Integral coaxial commutation and rotor magnets and apparatus and method for making same 16 1982
* 4779069 Apparatus and method for making integral coaxial communication and rotor magnets 6 1987
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (2)
* 4359657 Rotation speed signal detector 16 1980
* 4751415 Brushless DC motor with means for compensating ripple torque 20 1987
 
MITSUMI ELECTRIC CO., LTD. (1)
* 5631508 Cost-saving, small-sized motor with improved stability over wide speed range 2 1994
* Cited By Examiner