变频器原理与故障分析MCH41A0055-5A3-4-00

    能实现对交流异步电机的软起动、无级调速、提高运转精度、改变功率因数、节能、过流/过压/过载保护等功能。 

      变频调速技术的理论基础是三相交流异步电动机的转速与频率成正比，与极对数成反比  n=(1-s)60f/p  

      即三相（单相）交流电经过整流电路转换为直流电源，然后再逆变成三相交流电动机使用的经过调制的等幅脉动直流，脉动直流密度与对应交流应获得幅值成正比。 

  输出驱动电流使用了脉冲宽度调制技术（PWM）。由于输出的波形是脉动直流，所以变频器对电网的谐波干扰非常大。

第二部分、变频器速度控制方式 

变频器常见的频率给定方式主要有：操作器键盘给定、接点信号给定、模拟信号给定、通讯方式给定等。

 1、操作键盘给定 

通过操作键盘给定速度，手工或自动操作启动、停止变频器。 

2、接点信号给定 

通过外部开关接点组合代码来选择速度，而速度要在参数表设置。

3、模拟信号给定 

     包括0-5VDC、（0）1-10VDC、20mA电流、电位器给定等。

 4、通讯方式给定 

通过总线或其它接口，由另一个控制器把速度写入变频器特定的缓冲字中。

1、工作方式： 

    基本工作方式有恒转矩、恒功率两种。 （1）恒转矩控制 

根据转矩与“电压/频率”比值的平方成正比的数学关系，我们知道，要实现恒转矩方式，必须保持U/f为常数。这就是为什么恒转矩控制方式下，频率下降，输出电压也要跟着同比降低的原因。 （2）恒功率控制 

从电动机功率： 

P= MΩ=M*2лn/60=M*n/9554 

及转矩与（U/f）的平方成正比的关系，要实现恒功率调速，就必须保证U2/f为常数。

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SEW变频器MCFvalue="41" unitname="a" w:st="on">41A系列型号
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SEW变频器MCHvalue="41" unitname="a" w:st="on">41A系列型号
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SEW变频器MDVvalue="60" unitname="a" w:st="on">60A系列型号
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SEW变频器MDX61B系列型号
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