s=60f/p(1-n) => n=1-p*s/60/f
其中s为电机转速,f为电源频率,p为次对极数,n为转差率.
从转速看,此电机为4极电机,对极数为2.
故转差率n=1-p*s/60/f
=1-2*1440/60/50
=0.04