vf控制,電流波形不穩(wěn)

近期公司研制一臺(tái)變頻器,5級(jí)級(jí)聯(lián)到380v(實(shí)驗(yàn)樣機(jī)),控制采用vf,帶小電機(jī)500w沒(méi)問(wèn)題,帶7.5kw電機(jī)頻率在30hz以下也沒(méi)問(wèn)題,》40hz電流波形上下不等,電機(jī)轉(zhuǎn)速不穩(wěn),不知哪位大俠做過(guò),給點(diǎn)提示,先謝謝了.

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tanma

LV.5

2009-05-27 01:42

Maybe there is something wrong with your DC voltage measurement.I do not know the "5級(jí)級(jí)聯(lián)到380v".Have you measured your dc voltage with 500W and 7500W load. Or you may try to measure the small-scale dc voltage which fed to your MCU. I met the problem, the dc voltage measurement delay lead to a bad output current.
Good luck.

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xing_xf

LV.7

2009-05-27 09:57

@tanma

MaybethereissomethingwrongwithyourDCvoltagemeasurement.Idonotknowthe"5級(jí)級(jí)聯(lián)到380v".Haveyoumeasuredyourdcvoltagewith500Wand7500Wload.Oryoumaytrytomeasurethesmall-scaledcvoltagewhichfedtoyourMCU.Imettheproblem,thedcvoltagemeasurementdelayleadtoabadoutputcurrent.Goodluck.

謝謝,已解決

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