6ES7 235-0KD22-0XA8 12位精度,模擬量
由于繞組電流結(jié)合產(chǎn)生一個(gè)平穩(wěn)的常量轉(zhuǎn)子電流空間矢量,而且定子繞組的每個(gè)定位相距120度角,因此每個(gè)線組的電流是正弦的而且相移為120度。采用編碼器中的位置信息來對兩個(gè)正弦波進(jìn)行合成,兩個(gè)間的相移為120度。然后,將這些信號(hào)乘以轉(zhuǎn)矩命令,因此正弦波的振幅與所需要的轉(zhuǎn)矩成正比。結(jié)果,兩個(gè)正弦波電流命令得到恰當(dāng)?shù)亩ㄏ?,從而在正交方向產(chǎn)生轉(zhuǎn)動(dòng)定子電流空間矢量。
正弦電流命令信號(hào)輸出一對在兩個(gè)適當(dāng)?shù)碾姍C(jī)繞組中調(diào)制電流的P-I控制器。第三個(gè)轉(zhuǎn)子繞組中的電流是受控繞組電流的負(fù)和,因此不能被分別控制。每個(gè)P-I控制器的輸出被送到一個(gè)PWM調(diào)制器,然后送到輸出橋和兩個(gè)電機(jī)終端。應(yīng)用到第三個(gè)電機(jī)終端的電壓源于應(yīng)用到前兩個(gè)線組的信號(hào)的負(fù)數(shù)和,適當(dāng)用于分別間隔120度的三個(gè)正弦電壓。
結(jié)果,實(shí)際輸出電流波型的跟蹤正弦電流命令信號(hào),所得電流空間矢量平穩(wěn)轉(zhuǎn)動(dòng),在量上得以穩(wěn)定并以所需的方向定位。
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