摘要
根据感应电动机的等效电路和相量图,对大功率电机变频转工频所存在的问题进行了理论分析,并且指出大功率电机变频转工频能否成功,关键在于变频转工频的瞬时,工频电源和变频输出电源是否相位一致.在现场工业试验中引入鉴频鉴相控制器,成功地实现了大功率电机变频到工频的切换,转换电流小,基本上实现了电机的无冲击起动.图4,参9.
According to electrical equivalent circuit and vector graph of induction electromotor,discussion is made in theory about the problem,that exists in the course of transformation from variable frequency(VF) to work frequency(NF).Furthermore it point out that whether the high-power electromotor can be switched from VF to WF lies on phase consistency between work frequency phase voltage and corresponding variable frequency phase voltage.Frequency and phase discriminator is adopted in the industry test to successfully complete the transformation from VF to WF. As the transformation electrical current is small, non-impact transformation of the high-power electromotor is realized.4figs.,9refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
2004年第2期27-31,共5页
Journal of Hunan University of Science And Technology：Natural Science Edition
关键词
功率
电机
变频
工频
切换时间
供水技术
VF to WF
phase consistency
transformation current
transformation time
