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起重机械在运行过程中,能量的变化十分剧烈,对变频调速系统的要求较之其它拖动系统要高得多。具体要求是:(1)在低速(包括零速)应能输出较大转
Lifting machinery in operation, the energy change is very intense, the requirements of the frequency control system is much higher than the other drag system. Specific requirements are: (1) at low speed (including zero speed) should be able to output a larger turn