Inventor
IWAJI YOSHITAKA
JP68 patents
⚠️ This page may combine multiple inventors who share the name “IWAJI YOSHITAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
19 patentsUS6690137B2Feb 10, 2004
Sensorless control system for synchronous motor
HITACHI LTD74 citations98
US6628099B2Sep 30, 2003
Synchronous motor driving system and sensorless control method for a synchronous motor
HITACHI LTD45 citations96
US6531843B2Mar 11, 2003
Driving system of AC motor
HITACHI LTD55 citations96
US6043624AMar 28, 2000
Motor control method and motor control system
HITACHI LTD58 citations96
US6771039B2Aug 3, 2004
Motor control apparatus and method
HITACHI LTD20 citations93
US7825620B2Nov 2, 2010
Controller and constant measuring apparatus for AC motor
HITACHI LTD25 citations92
US7271557B2Sep 18, 2007
AC motor driving apparatus and method of controlling the same
HITACHI LTD33 citations92
US6650081B2Nov 18, 2003
Synchronous motor driving system
HITACHI LTD20 citations92
US6639377B2Oct 28, 2003
Driving device for synchronous motor
HITACHI LTD51 citations92
US6570358B2May 27, 2003
Control apparatus for alternating-current motor
HITACHI LTD34 citations92
US6225774B1May 1, 2001
Motor control method and motor control system
HITACHI LTD18 citations92
US8044618B2Oct 25, 2011
Control apparatus for AC motor
HITACHI LTD15 citations84
US7002274B2Feb 21, 2006
Rotary electric machine and automobile provided with the same
HITACHI LTD13 citations84
US6614137B2Sep 2, 2003
Linear motor, driving and control system thereof and manufacturing method thereof
HITACHI LTD14 citations84
US7075266B2Jul 11, 2006
Apparatus for controlling an a. c. motor
HITACHI LTD16 citations83
US7388341B2Jun 17, 2008
Control system for permanent magnet synchronous motor and module
HITACHI LTD8 citations74
US9712032B2Jul 18, 2017
Linear motor and linear motor drive system
HITACHI LTD2 citations73
US10608561B2Mar 31, 2020
Control device of AC motor
HITACHI LTD2 citations70
US7791295B2Sep 7, 2010
Field weakening control apparatus for permanent magnet motor and electric power steering using same
HITACHI LTD6 citations61
IWAJI YOSHITAKA
7 patentsUS8258732B2Sep 4, 2012
Drive system of synchronous motor
IWAJI YOSHITAKA17 citations84
US8232751B2Jul 31, 2012
Drive system of synchronous motor
IWAJI YOSHITAKA14 citations84
US8674647B2Mar 18, 2014
Drive device for alternating current motor and electric motor vehicle
IWAJI YOSHITAKA18 citations83
US8760095B2Jun 24, 2014
Rotator control device, rotator system, vehicle, electric car and electric generation system
IWAJI YOSHITAKA10 citations82
US9325264B2Apr 26, 2016
Electric motor drive device
IWAJI YOSHITAKA3 citations73
US8878480B2Nov 4, 2014
Synchronous motor drive system and synchronous motor
IWAJI YOSHITAKA2 citations62
US8766575B2Jul 1, 2014
Synchronous electric motor drive system
IWAJI YOSHITAKA3 citations62
HITACHI IND EQUIPMENT SYS
5 patentsUS7808202B2Oct 5, 2010
Beat-less controller for permanent magnet motor
HITACHI IND EQUIPMENT SYS10 citations83
US7276876B2Oct 2, 2007
Synchronous motor driving apparatus
HITACHI IND EQUIPMENT SYS12 citations83
US7030589B2Apr 18, 2006
Driving systems of AC motor
HITACHI IND EQUIPMENT SYS11 citations83
US7671558B2Mar 2, 2010
Induction motor controller
HITACHI IND EQUIPMENT SYS6 citations63
US7719226B2May 18, 2010
Highly responsive permanent magnet motor controller
HITACHI IND EQUIPMENT SYS6 citations61
HITACHI AUTOMOTIVE SYSTEMS LTD
4 patentsUS8884575B2Nov 11, 2014
Drive system for synchronous electrical motor
HITACHI AUTOMOTIVE SYSTEMS LTD7 citations84
US10644627B2May 5, 2020
Control device of synchronous electric motor, integrated motor system, pump system, and positioning system
HITACHI AUTOMOTIVE SYSTEMS LTD2 citations71
US11196377B2Dec 7, 2021
Motor drive system
HITACHI AUTOMOTIVE SYSTEMS LTD2 citations69
US11139771B2Oct 5, 2021
Control device and control method for AC motor and AC motor drive system
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations61
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD
3 patentsUS11193978B2Dec 7, 2021
Power conversion device, rotating machine system using same, and diagnosis method for same
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations62
US12061236B2Aug 13, 2024
Power conversion device, rotating machine system, and diagnosis method
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations61
US11437944B2Sep 6, 2022
Power conversion device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations60
HITACHI APPLIANCES INC
2 patentsAOYAMA YASUAKI
2 patentsRENESAS ELECTRONICS CORP
2 patentsHITACHI HOME & LIFE SOLUTIONS
1 patentSAKAI TOSHIFUMI
1 patentHANO MASAKI
1 patentNAKATSUGAWA JUNNOSUKE
1 patentRENESAS TECH CORP
1 patentJAPAN SERVO
1 patentShowing the top 50 of 68 patents by PatentIndex Score.