A load weight determining apparatus and method for an electric chain block having a lifting-lowering motor and an inverter controller. The lifting-lowering motor rotates a sheave to wind up and unwind a chain engaging the sheave. The load weight determining apparatus has a current detecting element detecting a motor current supplied to the lifting-lowering motor from the inverter controller, and a load weight determining unit. A torque current is calculated from the motor current detected by the load weight determining unit, and a variation cycle of the torque current is calculated. An average torque current value over a period of time corresponding to the variation cycle is calculated, and the average torque current value is compared with a set threshold to perform load weight determination.


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    Title :

    LOAD WEIGHT DETERMINING APPARATUS AND LOAD WEIGHT DETERMINING METHOD FOR ELECTRIC CHAIN BLOCK


    Additional title:

    APPAREIL DE DETERMINATION DE CHARGE PONDERALE ET METHODE DE DETERMINATION DE CHARGE PONDERALE POUR BLOQUE-CHAINE ELECTRIQUE


    Contributors:

    Publication date :

    2016-03-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66D Haspeln , CAPSTANS



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    APPARATUS AND METHOD FOR DETERMINING LOAD WEIGHT

    MACNAMARA JOSEPH M / INTAGLIATA JON D | European Patent Office | 2018

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    MACNAMARA JOSEPH M / INTAGLIATA JON D | European Patent Office | 2018

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    MACNAMARA JOSEPH M / INTAGLIATA JON D | European Patent Office | 2018

    Free access