Inventor
TOBARI KAZUAKI
JP48 patents
⚠️ This page may combine multiple inventors who share the name “TOBARI KAZUAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
17 patentsUS4869334ASep 26, 1989
Electric motor-driven power steering apparatus
HITACHI LTD70 citations95
US5016158AMay 14, 1991
Parallel multi-inverter system and motor drive system using the same
HITACHI LTD48 citations93
US7825620B2Nov 2, 2010
Controller and constant measuring apparatus for AC motor
HITACHI LTD25 citations92
US7619385B2Nov 17, 2009
Motor controller, washing machine, air conditioner and electric oil pump
HITACHI LTD30 citations92
US8044618B2Oct 25, 2011
Control apparatus for AC motor
HITACHI LTD15 citations84
US7521887B2Apr 21, 2009
Vector controller for a permanent magnet synchronous motor, inverter module, and permanent magnet synchronous motor constant display system
HITACHI LTD12 citations84
US6670786B2Dec 30, 2003
Apparatus for controlling an induction motor
HITACHI LTD13 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
US6344726B1Feb 5, 2002
Method of controlling an induction motor
HITACHI LTD9 citations74
US7148651B2Dec 12, 2006
Apparatus and method for controlling AC motor and module therefor
HITACHI LTD8 citations72
US7821223B2Oct 26, 2010
Vector controller for a permanent magnet motor and inverter module
HITACHI LTD2 citations63
US7528568B2May 5, 2009
Vector controller for permanent magnet synchronous motor
HITACHI LTD6 citations63
US7443120B2Oct 28, 2008
Field weakening vector controller for permanent magnet synchronous motor and control module
HITACHI LTD5 citations63
US7791295B2Sep 7, 2010
Field weakening control apparatus for permanent magnet motor and electric power steering using same
HITACHI LTD6 citations61
US7919941B2Apr 5, 2011
Semiconductor power converter
HITACHI LTD6 citations59
US7560896B2Jul 14, 2009
Vector control apparatus for permanent magnet motor
HITACHI LTD2 citations57
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD
12 patentsUS11777427B2Oct 3, 2023
Motor control device and automatic adjustment method for same
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD2 citations66
US11575338B2Feb 7, 2023
Power conversion device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations60
US11437944B2Sep 6, 2022
Power conversion device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations60
US11424707B2Aug 23, 2022
Power conversion apparatus
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations60
US10903767B2Jan 26, 2021
Synchronous motor control apparatus
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations59
US11273712B2Mar 15, 2022
AC electric motor control device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations57
US11831262B2Nov 28, 2023
Motor control device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations56
US11303236B2Apr 12, 2022
Induction motor overheat monitoring method, induction motor monitoring device, and induction motor control system
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations51
US12341447B2Jun 24, 2025
Power conversion device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations50
US12334847B2Jun 17, 2025
Power converter apparatus
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations49
US12341448B2Jun 24, 2025
Power conversion device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations45
US12308771B2May 20, 2025
Motor control device
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD0 citations42
HITACHI IND EQUIPMENT SYS
5 patentsUS7808202B2Oct 5, 2010
Beat-less controller for permanent magnet motor
HITACHI IND EQUIPMENT SYS10 citations83
US6954050B2Oct 11, 2005
Control method and control device of permanent-magnet type synchronous motor
HITACHI IND EQUIPMENT SYS14 citations83
US7602138B2Oct 13, 2009
Driving apparatus and driving system for electric motor
HITACHI IND EQUIPMENT SYS4 citations62
US7719226B2May 18, 2010
Highly responsive permanent magnet motor controller
HITACHI IND EQUIPMENT SYS6 citations61
US8344671B2Jan 1, 2013
Speed controller of magnetic motor
HITACHI IND EQUIPMENT SYS3 citations58
TOBARI KAZUAKI
5 patentsUS8305019B2Nov 6, 2012
Torque controller for permanent magnet synchronous motor
TOBARI KAZUAKI8 citations81
US9698716B2Jul 4, 2017
Motor control device and work machine using the same
TOBARI KAZUAKI3 citations68
US8410735B2Apr 2, 2013
Torque ripple suppression control device for permanent magnet motor and electric power steering system
TOBARI KAZUAKI4 citations60
US8779701B2Jul 15, 2014
Control apparatus for permanent magnet motor
TOBARI KAZUAKI2 citations57
US8106619B2Jan 31, 2012
Position sensorless controller for permanent magnet motor
TOBARI KAZUAKI1 citations51
HITACHI AUTOMOTIVE SYSTEMS LTD
3 patentsUS8884575B2Nov 11, 2014
Drive system for synchronous electrical motor
HITACHI AUTOMOTIVE SYSTEMS LTD7 citations84
US11196377B2Dec 7, 2021
Motor drive system
HITACHI AUTOMOTIVE SYSTEMS LTD2 citations69
US11239784B2Feb 1, 2022
Motor drive device, controller, and electric vehicle system
HITACHI AUTOMOTIVE SYSTEMS LTD1 citations59