ABB I/O模件DO801-eA DI821-eA
将电动机三角形改为星形接法，相当于定子绕组相电压减小到1/√3，这时电动机的各量有如下变化：
1.励磁功率这时励磁电流约减小到1/2，所以励磁无功功率减小到1/（2√3）=1/3.5。
2.定子铁耗与电压的平方成正比变化，约减小到1/3。
3.***大转矩与电压平方成比例变化，减小到1/3。为了保持稳定运行，电动机的负载要相应地减小。
4.转差率近似与电压平方成反比变化，在同样负载下，约增大到原来的3倍，但转速变化不大。
5.转子电流当负载不变时，电磁功率不变；由于磁通随电压减小到1/√3，故转子电流增大√3倍，使绕组发热增加。
6.漏磁无功功率漏磁无功功率将与电压的二次多方成反比增加，约增加3倍多。
7.定子电流定子电流决定于转子电流及空载电流星形接法时，前者增大，后者减小，故定子电流可能增大或减小，要看电动机的电磁特性及负载大小而定。但一般来说，电压降低时，定子电流增大。
8.有功损失转子绕组中的损耗因电流增大√3倍而增加到原来的3倍，定子绕组中的损耗则或增或减，要看定子电流的变化。
综合上述，将三角形改为星形接法后，由于电压降低，***大转矩减小，转子电流增大。如果维持负载不变，势必引起绕组的严重发热；或者由于转矩过小而使电动机停转。为了使改为星形接法后转子电流不超过额定值，则应适当减小电动机的负载。
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