A.定子旋轉(zhuǎn)磁場(chǎng) B.轉(zhuǎn)子旋轉(zhuǎn)磁場(chǎng) C.氣隙磁場(chǎng) D.定子旋轉(zhuǎn)磁場(chǎng)加轉(zhuǎn)子旋轉(zhuǎn)磁場(chǎng)
A.增大 B.減小 C.不變 D.不一定減小
A.450 B.540 C.575 D.590