Inventor
HOKARI SADAO
JP16 patents
Patents
16 patentsUS6408986B1Jun 25, 2002
Charger for elevator call devices
HITACHI LTD25 citations92
US4787021ANov 22, 1988
Current-type converter apparatus
HITACHI LTD26 citations92
US5155671AOct 13, 1992
Power converter with current-type inverter
HITACHI LTD27 citations91
US4378059AMar 29, 1983
Abnormal elevator speed detector
HITACHI LTD33 citations90
US5389749AFeb 14, 1995
Elevator system
HITACHI LTD51 citations89
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
US4319665AMar 16, 1982
AC Elevator control system
HITACHI LTD28 citations81
US4387436AJun 7, 1983
Method and apparatus for detecting elevator car position
HITACHI LTD23 citations80
US4553640ANov 19, 1985
Controller for elevator
HITACHI LTD17 citations73
US4039866AAug 2, 1977
Thyristor control apparatus
HITACHI LTD8 citations73
US6481531B1Nov 19, 2002
Elevator communications apparatus
HITACHI LTD13 citations72
US4101819AJul 18, 1978
Three phase controlling system
HITACHI LTD13 citations72
US4924373AMay 8, 1990
Apparatus and method for controlling switching elements in a PWN-controlled voltage source inverter
HITACHI LTD19 citations71
US6492790B2Dec 10, 2002
Driving system for driving AC motor
HITACHI LTD10 citations70
US4661757AApr 28, 1987
Controller for AC elevator
HITACHI LTD6 citations57