6ES7 321-1BL00-0AA0
6ES7 321-1BL00-0AA0
6ES7 321-1BL00-0AA0
6ES7 321-1BL00-0AA0
(2)重力转矩TG,即由重物及吊钩等作用于卷筒的转矩,其大小等于重物及吊钩等的复合重量G与卷筒半径r的乘积:
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TG=G·r (1)
TG的方向永远是向下的。
(3)摩擦转矩T0,即由于减速机构的传动比较大,减速机构的摩擦转矩(包括其他损失转矩)不可忽视。摩擦转矩的特点是,其方向永远与运动方向相反。2 变频调速的基本原理与电动机的机械特性
2.1 变频调速的基本原理
一般三相异步电动机调速方法有:(1)改变磁极对数p来改变电机转速,所得到的转速只能是3000、1500、1000…,为有级调速;(2)改变转差率s调速,常用的方法是改变定子电压调速和滑差电机调速,该方法转子损耗较大,效率低;(3)改变定子电源频率f1,其调速属于改变同步转速n1调速,由于没有人为的改变s,转子中不产生附加的转差功率损耗,所以效率高。其是一种较为理想的调速方法,但变频调速需要较复杂的控制电路组成。
Foxboro 14A
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