ao890 模块

ao890  模块

ao890交流电机调速的三种方法是什么?

1、改变磁极对数调速，目的就是控制磁场的同步速度控制转子转速。转差率不变，其转差损耗少，为有级调速，使用场合有限制。

2、改变转差率调速，同步转速不变改变转子回差激磁电流。缺点，无法利用电机的滑差功率，其功率因数低，而且全部的转差功率都以热能形式消耗掉。

3、改变频率调速，转差率和转差功率消耗都不变。

ao890 

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