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    • 91. 发明专利
    • AC ELEVATOR CONTROLLER
    • JPS62233073A
    • 1987-10-13
    • JP7706886
    • 1986-04-03
    • MITSUBISHI ELECTRIC CORP
    • ARAKI HIROSHITANAHASHI TORU
    • H02M1/14B66B1/28B66B1/30H02M7/48H02P27/06
    • PURPOSE:To minimize a charge detection time by connecting a resistance between an AC power source and a converter and connecting the AC power with the converter when the rate of rise of charging voltage of a smoothing capacitor is under a given value. CONSTITUTION:A three-phase induction motor 4 for making an elevator cage 10 go up and down converts a three-phase AC power source R-T into DC at a converter 18 via an operating electromagnetic contactor 12 and an AC reactor 17 and is driven and controlled by means of AC obtained by conversion of said DC via a smoothing capacitor 2 and an inverter 3. In this case, a charging electromagnetic contactor 19 and a resistance 20 are provided between the AC power R-T and the converter 18 and a detecting means 21 for the rate of rise of charging voltage of the capacitor 2 and a control means 22 giving a signal when an output from said detecting means is under a given value (these two means 21, 22 are realized by a microcom puter) are also installed therebetween. In this way, the prevention of a rush current and the like are made possible, because the converter 18 is connected with the AC power R-T when the rate of rise of charging voltage of the capacitor 2 is under a given value.