Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1992-09-16
1995-04-18
Dougherty, Thomas M.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187289, 318801, 363 35, 363 98, B66B 106
Patent
active
054070279
ABSTRACT:
An elevator control apparatus has a converter for converting AC power to DC power, an inverter for converting the DC power resulting from the conversion by the converter into AC voltage of a variable voltage and a variable frequency so as to drive with the AC voltage an induction motor for vertically moving an elevator car, a current detector for detecting the current output by the inverter and for producing an output signal indicative of the detected current, a current command generating circuit for generating a current command value for the induction motor, and a control circuit for controlling the inverter on the basis of both the current command value from the current command generating circuit and the output signal from the current detector. The control apparatus includes a cancellation circuit for cancelling offset voltage by storing, when the inverter is stopped while the current command generating circuit keeps generating the current command value, the output signal of the current detector, and by adding, when the inverter is in operation, the stored output signal to the present output signal of the current detector.
REFERENCES:
patent: 4576253 (1986-03-01), Tanahashi et al.
patent: 4779708 (1988-10-01), Sasao et al.
patent: 5105352 (1992-04-01), Iwasa et al.
Suzuki Satoshi
Yoshida Masayuki
Dougherty Thomas M.
Mitsubishi Denki & Kabushiki Kaisha
Nappi Robert
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