自动门
自动门:恒功率负载的工作特点
发布时间:2013/11/8
自动门讯:
恒功率负载:恒功率负载是指负载转矩TL的大小与转速力成反比,而其功率基
本维持不变的负载。各种薄膜的卷取机械是恒功率负载的典型例子之一。其工作特点如下:

    1)功率特点。薄膜在卷取过程中,要求被卷物的张力F必须保持恒定,其基本手段
是使线速度秒保持恒定。所以,在不同的转速下,负载的功率基本恒定,即
    PL =Fv=常数
即:负载功率的大小与转速的高低无关。
    同样需要说明的是:这里所说的恒功率,是指在转速变化过程中,功率基本不变,不
能和负载轻重的变化相混淆。就卷取机械而言,当被卷物体的材质不同时,所要求的张力
和线速度是不一样的,其卷取功率的大小也就不相等。

    2)转矩特点。负载阻转矩的大小决定于
    TL =Fr
式中  F-卷取物的张力;
   一一卷取物的卷取半径。
    十分明显的是,随着卷取物不断地卷绕到卷取辊上,卷取半径,.将越来越大,负载转
矩也随之增大。另一方面,由于要求线速度u保持恒定,故随着卷取半径r的不断增犬,
转速nL必将不断减小。
    (3)二次方律负载。二次方律负载是指转矩与速度的二次方成正比例变化的负载,例
如:风扇、风机、泵、螺旋桨等机械的负载转矩.在低速时由于
流体的流速低,所以负载转矩很小,随着电动机转速的增加,流速增快,负载转矩和功率
也越来越大.
    自动旋转门在工作时,处于稳定运行其负载转矩基本恒定而与转速无关,因而在分析
和设计电机拖动系统时,将旋转门认定为恒转矩负载。按照电机拖动及调速控制理论,电
动机调速方式应为恒转矩调速。
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