西門子變頻器制動(dòng)電阻的計(jì)算方法 A、接著計(jì)算制動(dòng)電阻的阻值在制動(dòng)單元工作過程中，直流母線的電壓的升降取決于常數(shù)RC，R即為制動(dòng)電阻的阻值， B為變頻器內(nèi)部電解電容的容量。這里制動(dòng)單元?jiǎng)幼麟妷褐狄话銥?10V。 C、后計(jì)算制動(dòng)電阻的標(biāo)稱功率由于制動(dòng)電阻為短時(shí)工作制，因此根據(jù)電阻的特性和技術(shù)指標(biāo)，我們知道電阻的標(biāo)稱功率將小于通電時(shí)的消耗功率， 一般可用下式求得： 制動(dòng)電阻標(biāo)稱功率=制動(dòng)電阻降額系數(shù)X制動(dòng)期間平均消耗功率X制動(dòng)使用率%2.6制動(dòng)特點(diǎn)能耗制動(dòng)（電阻制動(dòng)）的優(yōu)點(diǎn)是構(gòu)造簡單，缺點(diǎn)是運(yùn)行效率降低，特別是在頻繁制動(dòng)時(shí)將要消耗大量的能量，且制動(dòng)電阻的容量將增大。
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