自动门
自动门:恒转矩负载变频调速系统
发布时间:2014/7/3
恒转矩负载变频调速系统
    恒转矩负载的基本特点如下:
    1)在转速变化的过程中,负载的阻转矩保持不变,即常数。
    2)负载的机械功率PL与转速成正比.
    在某变频调速系统的有效转矩线,横坐标是电动机的负荷率,其定义是:
电动机轴上的负载转矩(负载折算到电动机轴上的转矩)与电动机额定转矩的比
值。
  多负载所要求的调速范围。具体分析如下:   
    (1)工作频率范围。  
    1)最低工作频率。变频调速系统中允许的最低
工作频率除了决定于变频器本身的性能及控制方式
电动机的允许负荷率。
    2)最高工作频率。最高工作频率的大小是和负荷率成反比的。工
作频率越高(走厂越大),允许的负荷率越小。
    此外,在决定最高工作频率时,还必须考虑机械承受振动的强度,从及轴承的耐磨程
度等。
    (2)调速范围与传动比。
    1)调速范围和负荷率的关系。如上所述,变频调速系统的最高和最低工作频率都
和负荷率有关,所以,调速范围也就和负荷率有关。
    假设某变频器在外部无强迫通风的状态
下,提供韵有效转矩线。负荷率越低,允许的调速范围越大。
    2)负荷率与传动比的关系。尽管负载本身的阻转矩不变,但负载转矩折算到电动机
轴上的值却是和传动比有关的。传动比A越大,则负载转矩的折算值越小,电动机轴上的
负荷率也就越小。传动机构的这一特点提供了一个扩大调速范围的途径。
    3)调速范围和传动比的关系。①当电动机轴上的负荷率为100%时,
允许的调速范围是比较小的;②在负载转矩不变的前提下,传动比越大,则电动机轴上
的负荷率越小,调速范围越大。
    因此,如果当调速范围不能满足负载要求时,可以考虑通过适当增大传动比来减小电
动机轴上的负荷率,增大调速范围。
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