Inventor
OKUYAMA TOSHIAKI
JP56 patents
⚠️ This page may combine multiple inventors who share the name “OKUYAMA TOSHIAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
48 patentsUS5414339AMay 9, 1995
Electric vehicle control system
HITACHI LTD139 citations98
US5355749AOct 18, 1994
Control apparatus and control method for motor drive vehicle
HITACHI LTD214 citations98
US6229719B1May 8, 2001
Method of inverter control and apparatus of the same
HITACHI LTD67 citations96
US5475293ADec 12, 1995
Method for measuring characteristic constants of alternating current motor and controller thereof based on said method
HITACHI LTD60 citations96
US4808903AFeb 28, 1989
Vector control system for induction motors
HITACHI LTD68 citations96
US4328454AMay 4, 1982
Apparatus for controlling ac motor
HITACHI LTD83 citations96
US4240020ADec 16, 1980
Control system for suppressing torque ripple in synchronous motor
HITACHI LTD80 citations96
US4680526AJul 14, 1987
Method of controlling inverter-driven induction motor
HITACHI LTD65 citations95
US4503377AMar 5, 1985
Variable speed rotary electric machine
HITACHI LTD86 citations95
US6642689B2Nov 4, 2003
Control apparatus for power converter
HITACHI LTD32 citations93
US6556460B2Apr 29, 2003
Method for controlling a vehicle provided with an electric power converter
HITACHI LTD22 citations93
US5029288AJul 2, 1991
Method and apparatus for operating a variable speed power generation system
HITACHI LTD32 citations93
US5016158AMay 14, 1991
Parallel multi-inverter system and motor drive system using the same
HITACHI LTD48 citations93
US4629959ADec 16, 1986
Method and apparatus for controlling PWM inverter
HITACHI LTD40 citations93
US4459534AJul 10, 1984
Method for controlling induction motor and apparatus therefor
HITACHI LTD37 citations93
US4344025AAug 10, 1982
Motor control system
HITACHI LTD33 citations93
US4330741AMay 18, 1982
Electric control apparatus of induction motor
HITACHI LTD30 citations93
US4125796ANov 14, 1978
Control apparatus for use in a synchronous machine
HITACHI LTD33 citations93
US6741063B2May 25, 2004
Inverter apparatus
HITACHI LTD16 citations92
US6704212B2Mar 9, 2004
PWM inverter with long carrier wave insertion
HITACHI LTD44 citations92
US6556464B2Apr 29, 2003
PWM converter system
HITACHI LTD30 citations92
US6496397B2Dec 17, 2002
Inverter device
HITACHI LTD29 citations92
US4875539AOct 24, 1989
Electric power steering control system
HITACHI LTD45 citations91
US7869232B2Jan 11, 2011
Electric power converter suppressing output voltage variation due to input voltage fluctuation
HITACHI LTD7 citations84
US6841911B2Jan 11, 2005
Machine tool
HITACHI LTD15 citations84
US6670786B2Dec 30, 2003
Apparatus for controlling an induction motor
HITACHI LTD13 citations84
US6611125B2Aug 26, 2003
Method for calculating inertia moment and driver for electric motor
HITACHI LTD14 citations84
US6844700B2Jan 18, 2005
Inverter apparatus
HITACHI LTD14 citations83
US4503376AMar 5, 1985
Control method for induction motors
HITACHI LTD19 citations82
US4503375AMar 5, 1985
Method for controlling induction motor and apparatus therefor
HITACHI LTD24 citations82
US4277735AJul 7, 1981
Control apparatus for induction motor
HITACHI LTD23 citations82
US4276504AJun 30, 1981
Control device for commutatorless motor
HITACHI LTD28 citations82
US4132931AJan 2, 1979
Control system for a.c. motors
HITACHI LTD29 citations82
US4088932AMay 9, 1978
Control system for commutatorless motor
HITACHI LTD21 citations82
US4060753ANov 29, 1977
Control system for commutatorless motor
HITACHI LTD22 citations82
US4206395AJun 3, 1980
Harmonic eliminating apparatus
HITACHI LTD19 citations81
US6657412B2Dec 2, 2003
Pulse width modulation method, pulse width modulator and power converter
HITACHI LTD11 citations74
US6344726B1Feb 5, 2002
Method of controlling an induction motor
HITACHI LTD9 citations74
US6300741B1Oct 9, 2001
Speed controlling method for induction motor
HITACHI LTD10 citations74
US4625272ANov 25, 1986
Converter control apparatus and method
HITACHI LTD11 citations74
US4524310AJun 18, 1985
Method and apparatus of controlling induction motors
HITACHI LTD14 citations74
US4295084AOct 13, 1981
Control apparatus of synchronous motor having thyristor converter
HITACHI LTD11 citations74
US4960178AOct 2, 1990
Motor-driven power steering apparatus
HITACHI LTD10 citations73
US3949283AApr 6, 1976
Control system for brushless motor
HITACHI LTD17 citations73
US5033565AJul 23, 1991
Motor-driven power steering apparatus
HITACHI LTD18 citations72
US4792742ADec 20, 1988
Control apparatus for an inverter with self-adjustment function of control constants
HITACHI LTD20 citations72
US4562397ADec 31, 1985
Squirrel-cage induction motor
HITACHI LTD12 citations72
US6633495B2Oct 14, 2003
DC apparatus and vehicle using the same
HITACHI LTD6 citations71
SANYO ELECTRIC CO
1 patentHITACHI IND EQUIPMENT SYS
1 patentShowing the top 50 of 56 patents by PatentIndex Score.