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1746-NIO4V
1.变频器调速是通过改变供给电动机的供电频率,来改变电机的转速,从而改变负载的转速的。将原来直接输入三相异步电动机的电源先行接入变频器,在变频器内部通过PWM等电子变流技术将工频交流电进行整流、逆变,成为一种频率可控的交流电在输入到电机中,在电机运转时可以通过V/F控制,输出转矩控制、矢量控制等控制方式调节频率,改变回路电流,实现节能运行,尤其是在电机轻载时节能效果明显,是—种已经广泛推广和应用的节能产品。
⒉调速器是针对单相电机进行的,分为单相直流控制,单相交流控制和单相直交控制。通过改变接入绕组的电阻和电容等来调节电机的速度和转速。这种调速并不是一种节能型的调速方法,对于电源供电功率的输出没有变化。应用广泛的就是家用电风扇这类产品。
这也是现在很多控制场合,变频器不能代替直流调速器的原因。
变频调速器和变频器是同义词,它们的作用是用来控制电机的转速和转矩。它们通过改变电源的电压和频率来控制电机的运行状态。可以说,它们的区别仅仅是称呼不同,没有本质区别。但是在不同的应用场合中,有时也会把它们区分开来,变频调速器更多的是指工业应用中大功率的变频器,而变频器则更倾向于指小功率的家用电器的变频器。
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