基于PWM 控制的軌道牽引系統(tǒng)變頻器設(shè)計(jì)
時(shí)間:2008-05-13 15:16:00來(lái)源:yangliu
導(dǎo)語(yǔ):?根據(jù)電機(jī)車的實(shí)際需要,變化牽引電機(jī)的電壓頻率值,通過(guò)雙PWM變頻調(diào)速系統(tǒng)簡(jiǎn)化硬件,實(shí)現(xiàn)電機(jī)車的調(diào)速控制,提高控制精度和系統(tǒng)的可靠性,且系統(tǒng)簡(jiǎn)單,具有廣闊的應(yīng)用前景
摘要:牽引電機(jī)車變頻器廣泛采用PWM控{6I技術(shù),由于它可同時(shí)實(shí)現(xiàn)變頻、變壓、反抑制諧波的特點(diǎn),在將穩(wěn)定的直流電變成一定頻率的交流電時(shí),可根據(jù)電機(jī)車的實(shí)際需要,變化牽引電機(jī)的電壓頻率值,通過(guò)雙PWM變頻調(diào)速系統(tǒng)簡(jiǎn)化硬件,實(shí)現(xiàn)電機(jī)車的調(diào)速控制,提高控制精度和系統(tǒng)的可靠性,且系統(tǒng)簡(jiǎn)單,具有廣闊的應(yīng)用前景。
關(guān)鍵詞:PWM控{6I;牽引變頻器;設(shè)計(jì)
[b][align=center]Design of the frequency converter in track driving
system based oi1 the PWM control
Liu Xin—hui.Cai Wei
(Lanzhoupolytechnic college,Lartzhou C.a(chǎn)nsu 730050,China)[/align][/b]
Abstract:PWM control technology which was widely used in locomotive frequency converter can realize frequency conversion and voltage conversion to counter—restrain hgrmonious simultaneity.When it changes stable DC into the certain frequency AC.a(chǎn)ccordingtothe electriclocomotive actual need,to changethe driving voltagefrequency value ofthe electrical machinero Y,andtIIl the doublePWM frequency conversion velocity modulation system to simplify hardware,inthiswaywill realize the electric locomo tive velocity modulation controlI increase the control precision and the system reliability。The system will be simpleI and also has a extremely broad application prospect.
Key words:PWM control;driving frequency converter design
1 引 言
為適應(yīng)煤炭、冶金、礦山等場(chǎng)所運(yùn)輸牽引需要,我國(guó)自行設(shè)計(jì)了7T及7T以上多種類型牽引電機(jī)車,它們能在窄軌機(jī)車運(yùn)行巷道中安全工作,其長(zhǎng)度、寬度和轉(zhuǎn)彎半徑都滿足冶金礦山、煤礦等特殊工況的使用要求,其核心技術(shù)是基于PWM控制的變頻調(diào)速技術(shù),與直流調(diào)速和其它交流調(diào)速相比,其變頻調(diào)速器的調(diào)速范圍、過(guò)載能力、調(diào)速精度、動(dòng)態(tài)響應(yīng)、功率因數(shù)、運(yùn)行效率、維護(hù)要求等方面均有明顯優(yōu)勢(shì),同時(shí)該裝置無(wú)觸點(diǎn),可調(diào)頻率,調(diào)電壓,簡(jiǎn)化維護(hù),甚至實(shí)現(xiàn)免維護(hù)。
2 牽引變頻器的分析與設(shè)計(jì)
利用牽引變頻器拖動(dòng)電動(dòng)機(jī),起動(dòng)電流小,能實(shí)現(xiàn)軟起動(dòng)和無(wú)級(jí)調(diào)速,方便地進(jìn)行加減速控制,使電動(dòng)機(jī)獲得高性能,大幅度節(jié)約電能。
[b][align=center]詳細(xì)內(nèi)容請(qǐng)點(diǎn)擊:
基于PWM 控制的軌道牽引系統(tǒng)變頻器設(shè)計(jì)[/align][/b]