Inventor
SHIMA SEIYA
20 patents
Patents
20 patentsUS4870556ASep 26, 1989
Method and apparatus for controlling power converter
HITACHI LTD28 citations92
US4833586AMay 23, 1989
PWM control for power converter system utilizing pulse dropping at minimum pulse widths
HITACHI LTD31 citations92
US4672520AJun 9, 1987
Current-source power converting apparatus with self-extinction devices
HITACHI LTD29 citations92
US4780660AOct 25, 1988
Apparatus for compensating reactive power by current-source type converter
HITACHI LTD36 citations88
US4829416AMay 9, 1989
Apparatus for controlling power transducers of the pulse width modulation (PWM) control type
HITACHI LTD21 citations82
US4099111AJul 4, 1978
Control apparatus for DC motor
HITACHI LTD27 citations82
US4263988AApr 28, 1981
Speed control system for a motor
HITACHI LTD23 citations81
US4499986AFeb 19, 1985
Control apparatus for passenger conveyor
HITACHI LTD24 citations80
US4387436AJun 7, 1983
Method and apparatus for detecting elevator car position
HITACHI LTD23 citations80
US4779709AOct 25, 1988
Apparatus for controlling AC elevators
HITACHI LTD8 citations73
US4636932AJan 13, 1987
dv/dt Protection circuit device for an AC-DC converter apparatus
HITACHI LTD7 citations73
US4553640ANov 19, 1985
Controller for elevator
HITACHI LTD17 citations73
US4361866ANov 30, 1982
Power converter apparatus
HITACHI LTD9 citations73
US4245293AJan 13, 1981
Power converter system
HITACHI LTD7 citations73
US4133018AJan 2, 1979
Thyristor fault-detecting apparatus
HITACHI LTD16 citations73
US4039866AAug 2, 1977
Thyristor control apparatus
HITACHI LTD8 citations73
US4441584AApr 10, 1984
AC Elevator control system
HITACHI LTD13 citations72
US4171505AOct 16, 1979
Fault detecting system for a control system
HITACHI LTD7 citations71
US4256204AMar 17, 1981
Safety apparatus for elevator system
HITACHI LTD8 citations70
US4007414AFeb 8, 1977
Current transducer arrangement
HITACHI LTD5 citations62