如果測量電(dian)機(ji)蓋的溫(wen)(wen)(wen)度(du)(du)(du)超過環境(jing)溫(wen)(wen)(wen)度(du)(du)(du) 25 度(du)(du)(du)以上(shang)時，表明電(dian)機(ji)的溫(wen)(wen)(wen)升已經超出了正常的范圍，一(yi)般電(dian)機(ji)溫(wen)(wen)(wen)升應該在(zai) 20 度(du)(du)(du)以下。一(yi)般電(dian)機(ji)線(xian)圈(quan)是由漆包線(xian)繞而成，而漆包線(xian)在(zai)溫(wen)(wen)(wen)度(du)(du)(du)高(gao)于 150 度(du)(du)(du)左(zuo)右(you)(you)時其漆膜會因為溫(wen)(wen)(wen)度(du)(du)(du)過高(gao)而脫落(luo)，造成線(xian)圈(quan)短路。當線(xian)圈(quan)溫(wen)(wen)(wen)度(du)(du)(du)在(zai) 150 度(du)(du)(du)以上(shang)時電(dian)機(ji)外殼所表現出的溫(wen)(wen)(wen)度(du)(du)(du)在(zai) 100 度(du)(du)(du)左(zuo)右(you)(you)，所以如果以其外殼溫(wen)(wen)(wen)度(du)(du)(du)為依(yi)據則電(dian)機(ji)所承受的高(gao)溫(wen)(wen)(wen)度(du)(du)(du)為 100 度(du)(du)(du)。