Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1991-06-28
1993-03-23
Pellinen, A. D.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187104, 307 75, B66B 1314
Patent
active
051966565
ABSTRACT:
An elevator door control apparatus includes an alternating current motor for opening and closing an elevator door. An inverter for converts a DC voltage from a first DC power supply into an AC voltage and supplies it to the motor. A first switching device for connects and disconnects the inverter and the motor, and a second switching device connects and disconnects a second DC power supply and the motor. A detection device detects at least one of an abnormality of the first DC power supply and an abnormality of the motor. A control device, at normal times supplies an AC voltage from the inverter to the motor by means of the first switching device and cuts off a DC voltage from the second DC power supply to the motor by means of the second switching device. When the detection device detects an abnormality, the control device cuts off an AC voltage from the inverter to the motor by means of the first switching device and supplies a DC voltage from the second DC power supply to the motor by means of the second switching device so as to cause a braking torque to be generated in the motor.
REFERENCES:
patent: 3814214 (1974-06-01), Booker, Jr.
patent: 4300663 (1981-11-01), Hmelovsky et al.
patent: 4776433 (1988-10-01), Lagree et al.
patent: 4815567 (1989-03-01), Ikejima
patent: 5070290 (1991-12-01), Iwasa et al.
Hirabayashi Terumi
Kodera Toshiyuki
Mizuno Masamoto
Tawada Masanori
Colbert Lawrence
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
LandOfFree
Elevator door control apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elevator door control apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elevator door control apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1353800