Patent ID: 6732838
Filing Date: 2004-05-11
Classification: B66B,H02J,H02M

Abstract:
In an a.c. elevator having a commercial power source, an inverter operable with the power from the commercial power source for generating a.c. power, and an electric motor to be driven with the a.c. power generated by the inverter,a power source device for the a.c. elevator characterized in that the power source device comprises a rechargeable/dischargeable battery, a charge/discharge circuit for charging and discharging the battery, and a control circuit for controlling the voltage to be input to the inverter according to a predetermined voltage command serving as a target value by controlling the operation of the charge/discharge circuit, the battery being chargeable with regenerative power from the electric motor, the battery being operable to generate power and supply the power to the inverter; wherein the predetermined voltage command has a value corresponding to a constant voltage higher than full-wave rectified voltage of the commercial power source.