Patent ID: 6471013
Filing Date: 2002-10-29
Classification: B66B,Y02B

Abstract:
An apparatus for controlling an elevator, comprising:a converter for converting an alternating current from an alternating current power supply into direct current power by rectifying the alternating current; an inverter for driving an electric motor by converting the direct current power from said converter into variable-voltage variable-frequency alternating current power, the electric motor driving an elevator; a direct current bus connecting said converter to said inverter; a power accumulator connected to said direct current bus, said power accumulator accumulating direct current power from said direct current bus during regenerative operation of the elevator, and supplying accumulated direct current power to said direct current bus during operation of the elevator; measuring means for measuring charging current flowing into and discharging current flowing out of said power accumulator and at least one of temperature and voltage of said power accumulator; and charge/discharge control means for controlling charging and discharging of said power accumulator and adjusting maximum charging and discharging current of said power accumulator in response to the charging and discharging current and at least one of the temperature and voltage measured by said measuring means, whereby excessive charging and discharging of said power accumulator are prevented.