Patent ID: 6435313
Filing Date: 2002-08-20
Classification: B66B

Abstract:
A controller for dynamically allocating delivery of regenerative power to a rechargeable power supply of an elevator system comprising:a converter for rectifying AC power of an AC power source to DC power; an inverter for converting the DC power to AC power having a variable voltage and a variable frequency for driving an electric motor to operate an elevator during powered operation of the elevator; DC buses connecting said converter to said inverter; a power accumulating device connected across said DC buses and accumulating DC power from the DC buses during regenerative operation of the elevator and supplying DC power to the DC buses during powered operation of the elevator; bus voltage measuring means for measuring bus voltage across said DC buses; charging-discharging control means for controlling charging and discharging of said power accumulating device with respect to said DC buses and receiving the bus voltage from said bus voltage measuring means; and charging-discharging state measuring means for measuring state of charge of said power accumulating device, charging and discharging currents of said power accumulating device, charging and discharging voltages of said power accumulating device, and temperature of said power accumulating device, said charging-discharging control means controlling the charging and discharging of said power accumulating device according to the bus voltage measured by said bus. voltage measuring means and at least one measured value measured by said charging-discharging state measuring means.