Control apparatus for A.C. elevator

Details Control apparatus for A.C. elevator Control apparatus for A.C. elevator

1987-05-06

1988-01-19

Shoop, Jr., 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

318806, B66B 130

Patent

active

047199954

ABSTRACT:
A control apparatus for an A.C. elevator having a variable voltage and variable frequency inverter for driving an induction motor coupled to a cage of the elevator, a control device for controlling the inverter in accordance with a deviation between a speed signal detected from the induction motor and a speed command signal having a preset value, and an abnormality detection device for interrupting feed of the A.C. power to the induction motor upon detecting that a slip frequency command corresponding to the deviation is greater than a predetermined set value and continues exceeding the predetermined set value in excess of a predetermined period of time.

REFERENCES:
patent: 4327313 (1982-04-01), Tsuboi et al.
patent: 4483419 (1984-11-01), Salihi et al.
patent: 4533862 (1985-08-01), Salihi
patent: 4600088 (1986-07-01), Yonemoto
patent: 4602701 (1986-07-01), Tanahashi
patent: 4625834 (1986-12-01), Tanahashi

Affiliated with

Also associated with

Rating

Control apparatus for A.C. 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 Control apparatus for A.C. elevator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control apparatus for A.C. elevator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-368161