Control apparatus for elevator

Details Control apparatus for elevator Control apparatus for elevator

1987-03-06

1988-05-10

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

B66B 130

Patent

active

047428929

ABSTRACT:
In an elevator control system employing a variable-voltage and variable-frequency control, a control apparatus having limiter for limiting the maximum value of a slip frequency .omega..sub.s when the frequency .omega..sub.0 of current command values to be delivered to an inverter circuit for operating an induction motor is evaluated in accordance with a condition formula of .omega..sub.0 =.omega..sub.s +.omega..sub.4 (where .omega..sub.r denotes the angular rotational frequency of the induction motor), whereby an actual car speed can be limited to a safe low value even when the detected car speed is erroneous due to a malfunction of the car speed detection device. Also, the time period during which the generated slip frequency command signal exceeds a reference value is measured to determine the current frequency command signal for the induction motor.

REFERENCES:
patent: 4483419 (1984-11-01), Salihi et al.
patent: 4600088 (1986-07-01), Yonemoto
patent: 4625834 (1986-12-01), Tanahashi

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1314611