當起重用電動機在比較惡劣的條件使用時,外界煤粉、鐵tie粉fen及ji其qi他ta導dao電dian粉fen塵chen和he油you汙wu浸jin入ru集ji電dian環huan,會hui造zao成cheng集ji電dian環huan銅tong環huan與yu銅tong環huan之zhi間jian擊ji穿chuan和he對dui地di擊ji穿chuan。尤you其qi是shi引yin線xian連lian接jie處chu由you於yu接jie觸chu不bu良liang或huo者zhe開kai焊han,造zao成cheng局ju部bu過guo熱re,都dou會hui使shi引yin接jie線xian連lian同tong絕jue緣yuan一yi同tong燒shao斷duan。出chu現xian上shang述shu故gu障zhang時shi,應ying該gai仔zai細xi、謹慎地進行修複。
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