Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-06-11
1987-05-05
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 502
Patent
active
046624783
ABSTRACT:
In an apparatus for automatic floor arrival at the time of service interruption in an A. C. elevator which is operated by an A. C. variable-voltage and variable-frequency control; when a slip frequency value during acceleration is at least a predetermined value, a burden raising mode is decided to switch running directions. Thus, in case of performing a rescue operation at the time of the service interruption, a load torque can be simply and reliably detected from the slip frequency value, and the elevator can be operated in a burden lowering direction.
Another construction is such that slip frequency values during acceleration are integrated, and when the slip frequency integration value is at least a predetermined value, a burden raising mode is decided to switch the running directions. In the rescue operation at the time of the service interruption, whereby the possibility of an erroneous control ascribable to the influence of a ripple component included in the slip frequency during the acceleration can be reduced to the greatest extent.
REFERENCES:
patent: 3469657 (1969-09-01), Sgroi
patent: 4220222 (1980-09-01), Kamaike et al.
patent: 4478315 (1984-10-01), Nomura
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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