Title:
【発明の名称】油圧エレベ―タの制御装置
Document Type and Number:
Japanese Patent JP2533683
Kind Code:
B2
Abstract:
An apparatus for controlling a car of a hydraulic elevator by variable-speed-driving an electric motor directly coupled to a hydraulic pump so as to adjust the rate at which oil is supplied from the hydraulic pump to a hydraulic jack system, the apparatus having a speed controller for variable-speed-driving the electric motor, a first detector for detecting the speed of the car, a second detector for detecting the rotational speed of the electric motor, a third detector for detecting a pressure in the hydraulic jack system, a feedback circuit for returning a control signal for limiting vibration of the car as a feedback signal to the speed controller. The feedback circuit forms the control signal from a differential signal representing the difference between a car speed value converted from the rotational speed of the electric motor detected by the second detector and the car speed detected by the first detector and a pressure signal representing the pressure detected by the third detector.
Inventors:
TOMIZAWA MASAO
KUBOTA TAKEHIKO
KUBOTA TAKEHIKO
Application Number:
JP27522990A
Publication Date:
September 11, 1996
Filing Date:
October 16, 1990
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
B66B1/26; B66B1/04; B66B1/24; B66B1/30; (IPC1-7): B66B1/26
Domestic Patent References:
| JP2221081A | ||||
| JP2215674A |
Attorney, Agent or Firm:
Mitsuteru Soga (5 people outside)