ABB机器人电机 3HAC17332-1
报价单位：厦门航拓电气有限公司
联系人：戴先生
手机：18006003561（微信同号）
座机：0592-5072089
***：565167042
变频器
变频器是利用电力半导体器件的通断作用将工频电源变换为另一频率的电能控制装置，
能实现对交流异步电机的软起动、变频调速、提高运转精度、改变功率因数、过流/过压/过载保护等功能。
PWM和PAM的不同点
PWM是英文Pulse Width Modulation(脉冲宽度调制)缩写，
按一定规律改变脉冲列的脉冲宽度，以调节输出量和波形的一种调制方式。
PAM是英文Pulse Amplitude Modulation (脉冲幅值调制) 缩写，
是按一定规律改变脉冲列的脉冲幅度，以调节输出量值和波形的一种调制方式。
3、电压型与电流型有什么不同？
变频器的主电路大体上可分为两类：
电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容；
电流型是将电流源的直流变换为交流的变频器，其直流回路滤波是电感。
4、为什么变频器的电压与频率成比例的改变？
任何电动机的电磁转矩都是电流和磁通相互作用的结果，
电流是不允许.过额定值的，否则将引起电动机的发热。
因此，如果磁通减小，电磁转矩也必减小，导致带载能力降低。
由公式E=4.44*K*F*N*Φ 可以看出，在变频调速时，
电动机的磁路随着运行频率fX是在相当大的范围内变化，
它.容易使电动机的磁路严重饱和，
导致励磁电流的波形严重畸变，产生峰值很高的尖峰电流。
因此，频率与电压要成比例地改变，即改变频率的同时控制变频器输出电压，
使电动机的磁通保持一定，避免弱磁和磁饱和现象的产生。
这种控制方式多用于风机、泵类节能型变频器。
5、电动机使用工频电源驱动时，电压下降则电流增加；
对于变频器驱动，如果频率下降时电压也下降，那么电流是否增加？
频率下降（低速）时，如果输出相同的功率,则电流增加，但在转矩一定的条件下,电流几乎不变。
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