问题
问答题 简答题
调压调速设备下降超速的原因是什么？
答案
参考答案：
对于升降机构，主林从下降4档拉回调速档时（即第四象限时），负载继续快速下降，速度超过了同步转速的130%，控制器将立即封锁输出。
（1）电机力矩突然不足，可能是这段时间内供电电压太低。（2）负载重量大大超过了电机的额定载荷重量。3）电机转子一相或两相开路。
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调压调速设备下降超速的原因是什么？
参考答案：
对于升降机构，主林从下降4档拉回调速档时（即第四象限时），负载继续快速下降，速度超过了同步转速的130%，控制器将立即封锁输出。
（1）电机力矩突然不足，可能是这段时间内供电电压太低。（2）负载重量大大超过了电机的额定载荷重量。3）电机转子一相或两相开路。
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Test-taking tips Do you sweat, check your pencil, and feel butterflies in your stomach as your teacher hands out the test paper? A lot of people feel anxious when it is time to take a test. Here are some tips for taking tests: 1 .Your memory recall will be much better if you have had enough rest. In a scientific study, people who got enough sleep before taking a math test did better than those who stayed up all night studying. Read the test through first. Once you have the test paper in front of you, read over the entire test, checking out how long it is and all the parts that you are expected to complete. 2 .If something seems unclear before you start, do not panic: ask the teacher. Focus on addressing each question individually. 3 . Instead, answer the best way you can or skip over the question and come back to it after you have answered other questions. Relax. 4 .Of course you can not get up and move around in the middle of a test, but you can wiggle (扭动) your fingers and toes, take four or five deep breaths. As we all know, It can be easy to forget things we know well. During a test, if you forget something and start to get tense, it suddenly becomes much more difficult to remember. Finished already? Although most teachers will let you hand your test paper in early, it is usually a good idea to spend any extra time checking over your work. 5 .On the other hand, if you have 5 minutes until the bell rings and you are still writing, wind up whatever you are working on without panic.
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