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我矿150L采金船,圆筒筛采用55kW六级异步绕线型电动机机械传动,电动机转子回路采用频敏变阻器进行起动,起动后将频敏变阻器短接运行。由于圆筒筛在运转中负载变化较大,电动机功率选择设计也较大,在正常运行时电动机的额定电流只能达到二分之一,最大负荷时也达不到三分之二,基本是大马拉小车。频敏变阻器特性是随转子频率而变化阻值的,由于圆筒筛设备负载有它的特殊性,所以造成圆筒筛每次起动时从零点达到额定转速时间快。如图1所示,机械冲击大响声异常,并且起动电流大(达到
Mine 150L gold mining vessels, cylindrical sieve using 55kW six asynchronous winding motor mechanical transmission, the motor rotor circuit with frequency-sensitive rheostat to start, the frequency converter will start short-circuit run. As the drum sieve in the operation load changes larger, motor power selection design is larger, the normal operation of the motor rated current can only reach one-half, the maximum load is less than two-thirds, basically Mara car. Freq varistor characteristics vary with the rotor frequency and resistance, due to the equipment of the cylindrical sieve device has its own particularity, resulting in every start up cylindrical sieve speed from zero to rated speed time. Shown in Figure 1, a large mechanical shock noise, and the starting current (to achieve