论文部分内容阅读
出场人物:张老师:退休高工,对变频器的应用及推广颇有研究。小孙:蓝天公司电气工程师课堂风格:深入浅出。小孙又到张老师家里,就迫不及待地拿出一张单子,打算开始提问了。“慢,”张老师见状,做了个等一等的手势。然后说:“我先问你,变频器在变频的同时,为什么还要变压?”“要保持电动机里的磁通不变。”小孙因为已经预习过了,所以回答得很痛快。“如果电压不随频率改变的话,磁通为什么就要变化了呢?”张老师又问。
Appearances: Zhang: retired senior engineer, the application and promotion of the drive quite a lot of research. Xiao-Sun: Blue Sky Electrical Engineer Classroom Style: simple. Xiao Sun went to Zhang’s home, it can not wait to come up with a list, intends to start questioning. “Slow, ” see the teacher Zhang, made a first-class gesture. And then say: “I first ask you, the frequency changer at the same time, why change the voltage?” “To keep the flux in the motor unchanged.” Very happy. “If the voltage does not change with the frequency, then why magnetic flux changes? ” Zhang asked again.