Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1986-04-21
1987-05-19
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
307 64, 307 66, 318801, 318802, 363 37, 363 41, B66B 130
Patent
active
046660208
ABSTRACT:
An elevator wherein an electric motor for driving the cage of the elevator is driven by the use of alternating current produced by an inverter, comprising a converter which feeds D.C. power to the inverter and which is so arranged that a plurality of transistors are connected into a bridge corresponding to the number of phases of an A.C. power source connected on the input side of the converter and that diodes are connected to the respective transistors in inverse parallel relationship. In addition, a battery to be used in emergency is connected on the input side of the converter. The converter is controlled in the pulse width modulation in the normal state of the A.C. power source, and the converter connected to the battery is controlled as a chopper during the stoppage of the power source, thereby making it possible to run the elevator at high speed even with the battery of low voltage.
REFERENCES:
patent: 4354223 (1982-10-01), Turnbull
patent: 4445167 (1984-04-01), Okado
patent: 4620272 (1986-10-01), Fulton et al.
Blum Richard K.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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