巴赫曼RS204/T Bachmann

RS204/T

两者的共同特点 交流伺服的技术本身就是借鉴并应用了变频的技术，在直流电机的伺服控制的基础上通过变频的PWM方式模仿直流电机的控制方式来实现的，也就是说交流伺服电机必然有变频的这一环节：变频就是将工频的50、60HZ的交流电先整流成直流电，然后通过可控制门极的各类晶体管（IGBT，IGCT等）通过载波频率和PWM调节逆变为频率可调的波形类似于正余弦的脉动电，由于频率可调，所以交流电机的速度就可调了（n=60f/p，n转速，f频率，p极对数）。     四、两者的区别

1. 过载能力不同。伺服驱动器一般具有3倍过载能力，可用于克服惯性负载在启动瞬间的惯性力矩，而变频器一般允许1.5倍过载。

2. 控制精度。伺服系统的控制精度远远高于变频，通常伺服电机的控制精度是由电机轴后端的旋转编码器保证。有些伺服系统的控制精度甚至达到1：1000

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Allen Bradley Powerflex 700 20BD011A0AYNANB0 7.5HP NIB

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