When all the surfaces of a workpiece are to be machined, the surface with larger blank error and machining allowance should be selected as rough location surface
【简答题】有一台三相交流异步电动机,额定功率 30KW , T st / T N =1.7 , n N = 1470r/min , U N =380V , Δ 形联结。为减小起动电流,该电机接在自耦降压器的二次侧。起动时自耦变压器二次侧电压为额定电压的 65% 。试求以下参数: ( 1 )问当负载转矩 T L 分别为额定转矩的 80% 和 50% 时,该电动机能否起动? ( 2 )此时电动机的起动转矩为多大...