Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-05-25
1985-07-09
Shoop, William M.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318266, 318267, 318436, 318739, 307 66, 307 77, B66B 500
Patent
active
045276633
ABSTRACT:
An apparatus for controlling an AC powered elevator and for improving the safety of the operation of the elevator includes: a three-phase AC power source; a drive device connected to the three-phase AC power source for converting an AC signal into an AC power having a variable frequency, thereby enabling the controlling of an induction motor; a winding induction motor connected to and controlled by the drive device for driving the cage of the elevator; a door induction motor connected to and controlled by the drive device for opening or closing the cage door provided at the cage of the elevator; and a motor control command device having an operation command generator which generates a command for starting or stopping the cage of the elevator so as to control the drive device and a door command generator which generates a command for opening or closing the cage door so as to control the drive device for independently controlling the winding induction motor and the door induction motor.
REFERENCES:
patent: 3428878 (1969-02-01), Stainken
patent: 4108281 (1978-08-01), Glaser
patent: 4376471 (1983-03-01), Uchino et al.
patent: 4436184 (1984-03-01), Dorman et al.
patent: 4436185 (1984-03-01), Ludwig et al.
Ip Paul Shik Luen
Mitsubishi Denki & Kabushiki Kaisha
Shoop William M.
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