离散变频软起动转速检测的新方法及其在频段切换中的应用 a novel speed measuring method of discrete variable frequency soft starting and its application in switching of frequency bans.pdfVIP
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离散变频软起动转速检测的新方法及其在频段切换中的应用 a novel speed measuring method of discrete variable frequency soft starting and its application in switching of frequency bans
通用低压电器篇(2007№3) ·应用与测试·
离散变频软起动转速检测的新方法
及其在频段切换中的应用
李冬辉, 马跃贤,王波
(天津大学电气与自动化工程学院,天津300072)
摘要:针对离散变频技术调压凋频的特点,提出了基于电动机失电残余电压的
测速方法,推导出了转速计算公式,并进行了误差分析。最后,利用该测速方法对离散
变频软起动频段切换,进行异步电动机的软起动全过程仿真。仿真结果表明,各频段切 李冬辉(1962一),
换平稳,满足了异步电动机高起动转矩软起动要求。 男,副教授,博士研
关键词:离散变频;软起动;仿真;失电残余电压 究生,主要从事电
301.2:TM921.5l
中图分类号:TM 文献标识码:B文章编号:1001.553l(2007)
力电子应用、计算
03m052旬5 机控制、楼宇自动
化等方面的研究。
ANoVel MethodofDiscreteVariable
SpeedMeasuring
Soft andIts in
FrequencyStarting AppIication
of Bans
Switching
Frequency
Ⅱ加n办“i,删y如石施n, 黝ⅣG曰D
ofE1ectrical and
(School En矛neeringAutomation,TianjinUniversity,Tianjin300072,China)
oncharacteristicsofdiscretevariable soft novel meth—
Abstract:Based fbquencystarting,aspeedmeasuring
od residual AC it8 oferrorswere
vQltage出erdumpw鹪proposed,aIld
using co吼tingfo硼ula,粕alysis presented.
Atl船tdiscretevariable this methodw鹤simulated.Thesimulation
f如quencyg硪staningbyusingspeedme鹊uring
re8ult8indicatethat 0fdiscrete baJldsi8 discretevariable soft
8witching fbquency smooth,aIld f南quency8taning
with出e methodc孤meettheneedofsoft fbr
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