自动门
自动门:异步电动机的调速
发布时间:2013/11/4
自动门讯:
异步电动机的调速。
    1)调速与速度变化。
    a.调速。调速是在负载没有改变的情况下,根据生产过程需要人为地强制性地改变
拖动系统的转速。
    
    b.速度改变。速度改变是由于负载的变化
而引起拖动系统的转速改变。如:若原系统工作
在Qi点,此时负载转矩由兀减小到Tz引起系
统加速,最后稳定运行在Q:点上。可见速度改
变时转速的变化是从同一根机械特性上得到的。
    2)调速指标。
    a·调速改变。
    c.调速的经济性。调速的经济性主要从两个方面来衡量:
    a)调速调备的投资和运行维修费用。
    b)电动机调速时引起的能量损耗。
    总的来说,以上两方面需考虑求得最佳的性能价格比。变频调速装置的价格一般较
高,但其故障率较低,在很多的场合节能效果显著,因此和直流调速系统比较,变频调速
系统的优势是很明显的。
    d.调速后工作特性。一种调速方案是否优良,调速后的工作特性能否满足负载的要
求,也是一个很重要的方面。常通过下面两点来衡量:
    a)静态特性。
    
    b)动态特性。指过渡过程中的性能。如,加减速过程是否快捷、平稳;遇到冲击性
负载时,系统的转速能否迅速恢复等。
    对大多数生产机械来说,希望调速后的机械特性能硬一些,负载变动时,速度变化较
小,动态抗干扰能力强,工作比较稳定。但也有的负载希望调速后的机械特性较软,如电
梯、自动旋转门,负载较重或门扇碰撞行人时,为安全起见,要求速度明显地便下来。
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