SAC-SW210/E

SAC-SW210/E

SAC-SW210/E

SAC-SW210/E

　　在进行电机调速时，电机磁通量是需要考虑的一个重要因素，假如磁通量太弱，电机会出现欠磁通，势必会给电机输出转矩带来很大影响。由于：

　　Tm=KTφmI2COSψ2 (1)

　　式中：Tm是电磁转矩;KT为比例系数;φm是主磁通量;I2是转子电流;cosψ2是转子回路的功率因数。

厦门岳航计算机工程有限公司

联系人：李素云

座机：0592-5165501

电话：18965423501

　　由式(1)可知，电机磁通量的降低直接影响电磁转矩的减小。因此，在改变电机频率时，应该对电机电压进行协调控制，以维持电机磁通的恒定。根据切割机的主电机参数，该系统选用Siemens公司的MM420变频器，通过设定变频器输出功率的变化来控制主电机转速的变化，两者之间近似呈线性关系，从而实现了无级调速的目的。PLC为漏型晶体管输出，与变频器的通讯采用基于USS协议的串行口RS 485通讯方式。这里，为了确保系统安全运行，必须将变频器接地端可靠接地。

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