IC698ETM001
IC698ETM001
IC698ETM001
IC698ETM001
电磁调速电机为鼠笼式电机，由于输入功率和转矩均保持不变，鼠笼式电机的功率保持不变。损耗以有功的形式表达出来，损耗功率通过转差离合器涡流发热并由电枢上的风叶散发出去。
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由损耗功率公式（10）可以清楚看到，电磁调速电机的转速越低，浪费能源越大，然而生产机械的转速通常不在最大转速下运行，变频调速是一种改变旋转磁场同步速度的方法，是不耗能的高效调速方式，因此改用变频调速的方式会有非常好的节能效果，节省的能量直接可用（10）式计算。
4､液力偶合器调速系统
液力偶合器是通过控制工作腔内工作油液的动量矩变化，来传递电动机能量，电动机通过液力偶合器的输入轴拖动其主动工作轮，对工作油进行加速，被加速的工作油再带动液力偶合器的从动工作涡轮，把能量传递到输出轴和负载。液力偶合器有调速型和限矩型之分，前者用于电气传动的调速，后者用于电机的起动，系统中的液力偶合器在电机起动时起缓冲作用。由于液力偶合器的结构与电磁转差离合器类似，仿照电磁调速器效率的计算方法，可得：
同样，用（12）式可计算将液力耦合器调速改造为变频调速后的节能量。
5､绕线式电机串电阻调速系统
绕线式电机最常用改变转子电路的串接电阻的方法调速，随着转子串接电阻的增大，不但可以方便地改变电机的正向转速，在位能负载时，还可使电机反向旋转和改变电机的反向转速，因此这种调速方式在起重﹑冶金行业应用较多。
对于绕线式电机，无论在起动､制动还是调速中，采用转子串电阻方式均会带来电能损耗。这种损耗随着转速的降低，转差率S的增大而增大，另外，随着串接电阻的增大，机械特性变软，难以达到调速的静态指标。
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