電機(jī)正常運(yùn)行時(shí)電機(jī)發(fā)熱量和電機(jī)散熱量相等可達(dá)到熱平衡,電機(jī)連續(xù)運(yùn)行不會(huì)燒壞,保護(hù)電路不啟動(dòng)。設(shè)Ie為該電機(jī)額定電流值,在時(shí)間段t內(nèi)的額定電流發(fā)熱量為:
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