题目内容
由于异步电动机对电网电压的波动非常敏感,运行时,如电压降低太多,会大大降低它的过载能力与启动转矩,甚至使电动机发生带不动负载或者根本不能启动的现象。()
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一般变频调速采用恒转矩调速,即希望最大转矩保持为恒值,为此在改变频率的同时,电源电压也要作相应的变化。()
鼠笼式异步电动机有直接启动和降压启动两种方法,采用什么启动方法要根据实际情况而定。()
If a project doesn’t have the necessary , it will often take longer than planned.
The project was started in 2006 and was supposed to be finished in October 2011. It wasuntil June 2012 for some reasons.
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