Three-phaseasynchronousmotorbelongstoinductionmotor.Therotatingspeedoftherotorislowerthanthatoftherotatingmagneticfield,andtheelectromotiveforceandcurrentgeneratedbytherelativemotionbetweentherotorwindingandthemagneticfieldgenerateelectromagnetictorquewitheachothertoachieveenergyconversion.Ithasthecharacteristicsofsimplestructure,reliableoperationandlightweight.