西门子产品6ES7314-6CH04-0AB0

6ES7314-6CH04-0AB0

直流伺服电动机的转速控制通常采用脉宽调制 PWM方式，如左图所示，方波控制信号Vb控制晶体管VT的通断，也就是控制电源电压的通断。Vb 为高电平时，晶体管VT导通，电源电压施加在电动机上，产生电流im。由于电动机的绕组是感性负载，电流im有一个上升过程。Vb为低电平时，晶体管VT断开，电源电压断开，但是电动机绕组中存储的电能释放出来，产生电流 im，电流 im 有一个下降的过程。

占空比就是在一段连续工作时间内脉冲（高电平）占用的时间与总时间的比值。直流电动机就是靠控制脉冲信号的占空比来调速的。当控制脉冲信号的占空比是60%时，也就是高电平占总时间的 60%时，施加在电动机定子绕组上的平均电压是 0.6U，当系统稳定运行时，电动机绕组中的电流平均值也是峰值的0.6。显然控制信号的占空比决定了施加在电动机上的平均电流和平均电压，也就控制了电动机的转速。无刷直流电动机的电流曲

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