A.脈動(dòng)磁場(chǎng) B.圓形旋轉(zhuǎn)磁場(chǎng) C.橢圓形旋轉(zhuǎn)磁場(chǎng) D.靜止磁場(chǎng)
A.斷開(kāi)電源后,將定子三相繞組出線端接入三相對(duì)稱電阻后短接起來(lái) B.斷開(kāi)電源后,在定子兩相繞組上加一直流電源 C.斷開(kāi)電源后,在定子兩相繞組上加一單相交流電源 D.以上都對(duì)