Elevator speed control

Details Elevator speed control Elevator speed control

1983-04-01

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

B66B 130

Patent

active

045276625

ABSTRACT:
To control an elevator motor, a first analog signal, the profile of which defines the velocity characteristics during acceleration, is generated in response to a motor jerk signal, a signal to accelerate the motor. This first analog signal is then multiplied with a second analog signal to provide a third analog signal which is supplied to the motor controls. The magnitude and polarity of that third analog signal controls motor speed and direction. The second analog signal has a unity value, a value of one, except when the car is within a slowdown distance from the floor. When the car moves through that range, the second analog signal decreases from unity. The second analog signal is provided from digital coefficients that are stored in a memory device and addressable for particular positions from the slowdown position. The coefficients are addressed by the output from a down counter that counts pulses that are provided by a car position transducer as the car moves from the slowdown position. The relationship between the counts and the stored digital coefficients which they address define the deceleration profile.

REFERENCES:
patent: 3589474 (1971-06-01), Wavre
patent: 3747710 (1973-07-01), Winkler
patent: 3777855 (1973-12-01), Boyldew et al.
patent: 3779346 (1973-12-01), Winkler
patent: 3783974 (1974-01-01), Gilbert et al.

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