securecrt7.0注册机:变频器的工作原理及用途、优缺点

工作原理：把380V的交流变成直流再变成频率可调的交流电。
用途：实现电机的无级调速。
优点：比较省电。比直流调速维护方便。

Definition:
Variable speed motor drive (VSMD) is used to control the electrical machine by modifying the frequency of its output voltage.
通过改变变频器的输出电压可以控制被拖电动机的转速。
Principle:
VSMD was developed based on the following equation:
speed = 60*frequency*(1-slip)/(pole-pairs of motor).
According to the equation, it is easily seen that motor speed is proportional to the frequency of input voltage. Thus, when VSMD is used to drive a motor, motor speed can be modified by setting different output frequency of VSMD.
基于电机学的公式，转速和频率成正比。
Advantages:
Energy saving, high performance, convenient maintenance ...
节能，高性能，易于维护
Market Products:
一些厂商
ABB, Mitsubish, Fuji, Rockwell, Yaskawa, Siemens, Danfoss, Lenze, Schneider, Emerson, Delta, Hitachi etc.
Applications:
Elevator, Paper Making, Waste Disposal, Water Disposal, Printing, Machinery, etc.
电梯，造纸，废物处理，水处理，印刷，机床等

输出电压