自动门
自动门:直流电动机的启动、反向和调速
发布时间:2013/10/4
自动门讯:
直流电动机的启动、反向和调速
    由于直流电动机具有以上优点,故其启动特性比较好。由于tt很大,故通常可带载
甚至满载启动。
    对于直流电动机的反转,通常有两种方案:一是改变电枢电压U.的极性l二是改变
励磁绕组电压U(的极性。在做电机反转控制时,要分清不同方法的利弊,并有合理的控
制方案。
    在负载转矩凡一定时,要对直流电动机进行调速,改变转速
有三种办法:
    1)在电枢回路中串人可变电阻,通过调节总的电枢回路电阻尺.来达到使刀改变。但
这种方法能耗较大,仅适用于电机且调速要求不高的场合。
    2)改变励磁电压,以改变磁通量①中使转速n改变。这种方法的不足是:磁通过大
会使磁路饱和;磁通道小,则会影响电磁转矩变小,结果反而又迫使电枢电流增大。
    3)改变电枢电压U.也可改变转速力。这种方法只能使以向下调节,也即只能使转
速疗向低速变化。但这种方案由于硬度不变,靠与阢呈线性关系,调速范围大,易于控
制。因此,这是直流电动机调速系统中主要采用的方案。
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