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电动机的选择主要有电动机的类型、结构型式、容量、额定电压与额定转速。
电动机选择的基本原则是:
(1)根据生产机械调速的要求选择电动机的种类。
(2)工作过程中电动机容量要得到充分利用。
(3)根据工作环境选择电动机的结构型式。
应该强调,在满足设计要求情况下优先考虑采用结构简单,价格便宜,使用维护方便的三相交流异步电动机。
正确选择电动机容量是电动机选择中的关键问题。电动机容量计算有两种方法,一种是分析计算法,另一种是统计类比法。分析计算法是按照机械功率估计电动机的工作情况,预选一台电动机,然后按照电动机实际负载情况做出负载图,根据负载图校验温升情况,确定预选电动机是否合适,不合适时再重新选择,直到电动机合适为止。
电动机容量的分析计算在有关论著中有详细介绍,这里不再重复。
在比较简单、无特殊要求、生产数量又不多的电力拖动系统中,电动机容量的选择往往采用统计类比法,或者根据经验采用工程估算的方法来选用,通常选择较大的容量,预留一定的裕量。
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