Delayed start of elevator car deceleration and creep using VVVF

Details Delayed start of elevator car deceleration and creep using VVVF Delayed start of elevator car deceleration and creep using VVVF

1990-10-12

1992-10-13

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

B66B 130

Patent

active

051553058

ABSTRACT:
The invention concerns an open-look speed control device for an induction motor to drive an elevator cabin, approaching a premarked where braking must be initiated point in advance of stopping at a marked point at a floor level to be approached at a creep speed, and for a VVVF inverter, which supplies current to the induction motor.
The current supplied to the induction motor, is measured when the cabin travels at constant speed prior to reaching the premarked point.
A slippage compensation unit determines a pertinent slippage frequency from the measured active current, and from it derives the frequency specification for the upcoming creep phase. A memory stores a function that indicates creep time as a function of the measured active current.
A computer unit calculates a delay time for the next run from the measured creep time. The start of the cabin's deceleration process is delayed, according to a lookup function, and after the car stops a new virtual updated creep time is again "measured" by turning from the stopping of dictated deceleration until the actual end of the creep process.

REFERENCES:
patent: 3785463 (1974-01-01), Kuhl et al.
patent: 3902575 (1975-09-01), Ostrander
patent: 4155426 (1979-05-01), Booker
patent: 4394889 (1984-07-01), Gray
patent: 4470482 (1984-09-01), Husson
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4681191 (1987-07-01), Ikejima
patent: 4700811 (1987-10-01), Evin
patent: 4713595 (1987-12-01), Yonemoto
patent: 4773508 (1988-09-01), Mine et al.
patent: 4982816 (1991-01-01), Doi et al.
patent: 4991693 (1991-02-01), Stern et al.

Affiliated with

Also associated with

Rating

Delayed start of elevator car deceleration and creep using VVVF does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Delayed start of elevator car deceleration and creep using VVVF , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Delayed start of elevator car deceleration and creep using VVVF will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1302498