Bently Nevada 330780-91-05

• 型号：330780-91-05


• 数量：3


• 制造商：　厦门兴锐达自动化设备有限公司


• 有效期：2019/11/13 0:00:00

Bently Nevada 330780-91-05

Bently Nevada 330780-91-05

Bently Nevada 330780-91-05

数控机床中伺服系统主要有交流和直流伺服电动机，它们的速度调节方式有所不同。

直流伺服电动机常用的调速方式有两种:

(1)晶闸管直流调速(SCR)

晶闸管直流调速是通过调节触发装置的控制电压大小(控制晶闸管的开放角)来移动触发脉冲的相位，从而改变了整流电压的大小，使直流电动机电枢电压变化而平滑调速。

(2)脉宽调制直流调速(PWM}

PWM调速是在大功率开关晶体管的基极上，加上脉宽可调的方波电压，控制开关管的导通率，达到调速的目的。

交流伺服电动机调速通常由调频调速的方法实现。实现调频调压有多种方法，通常都是采用交流一直流一交流的变换电路来实现，这种电路的主要组成部分是电流逆变器。

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