DH7201X1-A4
DH7201X1-A4
DH7201X1-A4
交流电动机的调速方法有三种:变极调速、改变转差率调速和变频调速。其中,变频调速具优势。这里仅就交流变频调速系统与直流调速系统做一比较。
在直流调速系统中,由于直流电动机具有电刷和整流子,因而必须对其进行检查,电机安装环境受到限制。例如:不能在有易爆气体及尘埃多的场合使用。此外,也限制了电机向高转速、大容量发展。而交流电机就不存在这些问题,主要表现为以下几点:
,直流电机的单机容量一般为12-14MW,还常制成双电枢形式,而交流电机单机容量却可以数倍于它。
第二,直流电机由于受换向限制,其电枢电压高只能做到一千多伏,而交流电机可做到6-10kV。第三,直流电机受换向器部分机械强度的约束,其额定转速随电机额定功率而减小,一般仅为每分钟数百转到一千多转,而交流电机的达到每分钟数千转。
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