摘要
为了限制异步电机较大的起动电流,经常采用降压起动的方法。但目前对异步电机降压起动的问题研究较少。以电机理论为基础,利用电机的机械特性曲线,分析了异步电机降压Uσ起动时的起动时间、起动功率和起动损耗。设Uσ与额定电压UN之比为降压系数σ(0<σ<1),与额定电压UN起动时相比,降压Uσ起动时的起动时间tσ增大到1σ2,起动功率ΔPσ减小到1/σ2,起动损耗ΔW不变,降压起动不能节能。
In order to limit the larger starting current of induction motor,re duced-voltage startup is used frequently,but up to now,studies of reduced-voltage startup for induction motors have been relatively scarce.Therefore based on the electric theory,and using torque-speed characteristic curve of induction motor,the startup time,startup power and startup loss of induction motor are analyzed when the reduced-voltage Uσ startup.Set the ratio of Uσ to rated-voltage UN is reduced-voltage coefficient σ(0σ1),compared with the rated-voltageUN startup,can get that the reduced-voltage Uσ startup time tσincreased to 1/σ2 times,startup power ΔPσ reduced to 1σ2,startup loss ΔW is unchanged,reduced-voltage startup can not be energy-saving.
出处
《科学技术与工程》
2011年第21期5025-5028,共4页
Science Technology and Engineering
基金
黑龙江省研究生创新科研基金项目(YJSCX2006-33HLJ)资助
关键词
异步电机
降压起动
起动时间
起动功率
起动损耗
induction motor reduced-voltage startup startup time startup power startup loss