2711P-RDT12C
2711P-RDT12C由DSP產(chǎn)生PWM波形控制逆變器,,使逆變器的換向頻率從小到大慢慢的增大,,而且給無(wú)刷直流電機(jī)的定子電壓開(kāi)始很小,逐步升高,,把無(wú)刷直流電機(jī)作為永磁同步電機(jī)實(shí)現(xiàn)變頻起動(dòng),。與此同時(shí),將PWM波形的參數(shù)送入比較器進(jìn)行比較,,當(dāng)PWM的占空比達(dá)到定數(shù)值,,也就是電壓足夠大,電機(jī)轉(zhuǎn)速達(dá)到定速度以后,,就可以獲得足夠大的反電動(dòng)勢(shì),,這時(shí),就可以適時(shí)地將電機(jī)切換到無(wú)刷直流電機(jī)反電動(dòng)勢(shì)控制的運(yùn)行狀態(tài),。
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