Zużycie energii elektrycznej w układach napędowych przenośników taśmowych

High capacity conveyor belts are driven with two or four slip-ring induction motors. The investigated conveyor belt is characterised by capacity of 11000 m^3/h and is driven with two four slip-ring induction motors rated at 630 kW each. The results of tests of capacity and electrical energy input run during 472.25 h and averaged to 15-minute intervals (Table 1 and 2) were the grounds for analysis of drive electrical energy consumption under following real-life conditions: - at rated rotational speed of the motors - 980 rpm, - at two different rotational speeds: 980 rpm and 490 rpm, - at continuous change of rotational speed adjusted so that the belt is filled up completely (100% load). The results of electrical energy consumption in these three cases are set out in Table 3. Figures 4 and 5 show electrical diagrams of electromachine cascades operating at 490 rpm (Fig.4) and 245 rpm (Fig.5).