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.
LOAD WEIGHT DETERMINING APPARATUS AND LOAD WEIGHT DETERMINING METHOD FOR ELECTRIC CHAIN BLOCK
APPAREIL DE DETERMINATION DE CHARGE PONDERALE ET METHODE DE DETERMINATION DE CHARGE PONDERALE POUR BLOQUE-CHAINE ELECTRIQUE
2016-03-29
Patent
Electronic Resource
English
IPC: | B66D Haspeln , CAPSTANS |