B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/31
B66B 1/40 (2006.01) B66B 1/16 (2006.01) B66B 1/28 (2006.01) B66B 1/50 (2006.01)
Patent
CA 1062382
LEVELLING APPARATUS FOR AC ELEVATOR ABSTRACT OF THE DISCLOSURE In an a-c elevator, an elevator car suspended by ropes is driven by an induction motor for vertical movement. A system commonly used for controlling the speed of the induction motor comprises a thyristor device including thyristors connected in parallel with opposite polarities across a three-phase a-c power source and the induction motor for controlling the motoring torque produced by the induction motor, a bridge rectifier including a thyristor for supplying direct current to the induction motor for controlling the braking torque produced by the induction motor, and means for controlling the operating phase of the thyristors in the thyristor device and the thyristor in the bridge rectifier depending on the error between the instructed speed and the actual speed of the elevator car. When the elevator car stops at a target floor and passengers get on and off the elevator car, the variation in the load of the elevator car results in an increase or decrease in the length of the ropes thereby giving rise to an error between the floor level of the target floor and that of the elevator car. A levelling apparatus is provided which comprises a position detector detecting this level error in either direction, and a level correction speed pattern signal generator generating a level correction speed pattern signal in response to the appearance of an output from the position detector, so that the operating phase of the thyristors in the thyristor device and the thyristor in the bridge rectifier can be controlled depending on the error between the level correction speed pattern and the actual speed of the elevator car.
250284
Kameyama Tadao
Komuro Katsu
Maeda Yasuyuki
Mitsui Nobuo
LandOfFree
Levelling apparatus for ac elevator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Levelling apparatus for ac elevator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Levelling apparatus for ac elevator will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-607941