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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。()
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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.
The town is cut off with the outside world for some unknown reasons.
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