富士FRN 0005 C2S-4C 緊湊型低壓變頻器
電壓空間矢量(SVPWM) 它是以三相波形整體生成效果為前提,以逼近電機(jī)氣隙的理想圓形旋轉(zhuǎn)磁場(chǎng)軌跡為目的,一次生成三相調(diào)制波形,以內(nèi)切多邊形逼近圓的方式進(jìn)行控制的。經(jīng)實(shí)踐使用后又有所改進(jìn),即引入頻率補(bǔ)償,能消除速度控制的誤差;通過反饋估算磁鏈幅值,消除低速時(shí)定子電阻的影響;將輸出電壓、電流閉環(huán),以提高動(dòng)態(tài)的精度和穩(wěn)定度。但控制電路環(huán)節(jié)較多,且沒有引入轉(zhuǎn)矩的調(diào)節(jié),所以系統(tǒng)性能沒有得到*。
富士FRN 0005 C2S-4C 緊湊型低壓變頻器
Can eliminate the error of speed control; The influence of the stator resistance at low speed is eliminated by the feedback estimation of the magnetic chain amplitude. The output voltage and current are closed to improve the dynamic accuracy and stability. However, there are more control circuit and no torque adjustment is introduced, so the system performance is not improved at all.
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