Inventor
AOYAGI SHIGEHISA
JP36 patents
⚠️ This page may combine multiple inventors who share the name “AOYAGI SHIGEHISA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI AUTOMOTIVE SYSTEMS LTD
13 patentsUS8884575B2Nov 11, 2014
Drive system for synchronous electrical motor
HITACHI AUTOMOTIVE SYSTEMS LTD7 citations84
US10411621B2Sep 10, 2019
Drive device for three-phase synchronous motor
HITACHI AUTOMOTIVE SYSTEMS LTD3 citations73
US10348218B2Jul 9, 2019
Power conversion device and electric power steering device using the same
HITACHI AUTOMOTIVE SYSTEMS LTD2 citations72
US9831814B2Nov 28, 2017
Electric motor drive control device, electrically driven power steering device, electrically driven brake device, and electrically driven pump device
HITACHI AUTOMOTIVE SYSTEMS LTD4 citations72
US9531305B2Dec 27, 2016
Inverter apparatus
HITACHI AUTOMOTIVE SYSTEMS LTD4 citations72
US10924048B2Feb 16, 2021
Inverter control device, motor drive device, and electric power steering apparatus
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations62
US11451179B2Sep 20, 2022
Motor control device and brake control device
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations52
US11325641B2May 10, 2022
Control device for electric power steering apparatus and electric power steering apparatus
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations52
US11228271B2Jan 18, 2022
Control device for three-phase synchronous motor and electric power steering device using the same
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations52
US11290036B2Mar 29, 2022
Control device
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations51
US10745045B2Aug 18, 2020
Control device for power steering device, and power steering device
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations41
US10700627B2Jun 30, 2020
Power converter and electric power steering apparatus
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations41
US10511249B2Dec 17, 2019
Inverter driving device, electric brake apparatus, and electric power steering apparatus
HITACHI AUTOMOTIVE SYSTEMS LTD0 citations39
HITACHI ASTEMO LTD
12 patentsUS12581625B2Mar 17, 2026
Power conversion device
HITACHI ASTEMO LTD0 citations62
US12513826B2Dec 30, 2025
Power semiconductor device
HITACHI ASTEMO LTD0 citations62
US12512709B2Dec 30, 2025
Rotating electric machine
HITACHI ASTEMO LTD0 citations61
US12491774B2Dec 9, 2025
Motor control device, electromechanical integrated unit, boost converter system, electric vehicle system, and motor control method
HITACHI ASTEMO LTD0 citations61
US12463576B2Nov 4, 2025
Inverter control device and inverter control method
HITACHI ASTEMO LTD0 citations61
US11611292B2Mar 21, 2023
Power conversion device
HITACHI ASTEMO LTD0 citations58
US12581947B2Mar 17, 2026
Power semiconductor device, power conversion device, and electric system
HITACHI ASTEMO LTD0 citations52
US12506419B2Dec 23, 2025
Power conversion device
HITACHI ASTEMO LTD0 citations52
US12562657B2Feb 24, 2026
Inverter control device, hybrid system, electromechanical integrated unit, electric vehicle system, and inverter control method
HITACHI ASTEMO LTD0 citations51
US12542471B2Feb 3, 2026
Inverter integrated motor
HITACHI ASTEMO LTD0 citations51
US11831265B2Nov 28, 2023
Motor control device
HITACHI ASTEMO LTD0 citations50
US12537406B2Jan 27, 2026
Rotating electric machine
HITACHI ASTEMO LTD0 citations48
HITACHI LTD
4 patentsUS7332882B2Feb 19, 2008
Motor drive device that combined charge controller
HITACHI LTD14 citations84
US7388341B2Jun 17, 2008
Control system for permanent magnet synchronous motor and module
HITACHI LTD8 citations74
US7821223B2Oct 26, 2010
Vector controller for a permanent magnet motor and inverter module
HITACHI LTD2 citations63
US7919941B2Apr 5, 2011
Semiconductor power converter
HITACHI LTD6 citations59