Patent ID: 6454053
Filing Date: 2002-09-24
Classification: B66B

Abstract:
An elevator control apparatus comprising:a converter for rectifying AC power to produce DC power; an inverter for converting the DC power into AC power having a variable voltage and a variable frequency; DC buses connecting the converter to the inverter; a controller for controlling a motor, based on the AC power having a variable voltage and variable frequency, the motor operating an elevator; a chargeable and dischargeable power storage unit for storing and discharging DC power; temperature detecting means for detecting temperature of the power storage unit; a charge/discharge control circuit, inferring charging and discharging capacities of the power storage unit with temperature and controlling charging and discharging of the power storage unit based on the inferred charging and discharging capacity for the temperature detected, and issuing, in response, a drive signal; and a charge/discharge circuit coupling the power storage unit to the DC buses and charging and discharging the power storage unit in response to the drive signal issued by the charge/discharge control circuit, with the DC power supplied from the DC buses and supplying stored DC power to the DC buses, respectively.