Power supply for ac elevator
First Claim
1. 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.
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Accused Products
Abstract
An a.c. elevator of the invention has a commercial power source (1), an inverter (3) operable with the power from the commercial power source (1) for generating a.c. power, and an electric motor to be driven with the a.c. power generated by the inverter (3). A power source device includes a rechargeable battery (E), a power source circuit (10) for charging and discharging the battery (E), and a control circuit (9) for controlling the voltage to be input to the inverter (3) by controlling the operation of the power source circuit (10). The battery (E) is charged with regenerative power from the motor, the power generated by the battery (E) is supplied to the inverter (3).
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Citations
33 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification