笼型三相异步电动机的额定数据如表所示。供电变压器要求启动电流不大于150A,负载要求启动转矩为73.5N·m,试在Y-△启动和自耦变压器启动两种方法中选择该笼型三相异步电动机的合适启动方法以满足变压器和负载的要求。已知自耦变压器有55%,64%,73¥三挡抽头。 P N /kW U N /V I N /A coseφ N n N /r/min 接法 I st /I N T st /T N T m /T N 28 380 58 0.88 1455 △ 6 1.1 2.3
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