In the gap magnetic field of pole changing synchronous machine, there would be large harmonics, which have some effects on the operating performance of the machine.
由于变极同步电机气隙磁场中将存在较大的谐波，这些磁场谐波对电机运行性能将产生一些影响。
2
The pole columns of the circuit-breaker are each mounted on a base 11, to the side of each of which an operating mechanism cubicle 15.1 is fitted.
断路器的每相极柱分别安装在基架11上，每个基架旁边都有一个操作机构箱15.1。
3
The utility model discloses a pair of double-poleoperating forceps for a thoracoscope and an abdominoscope.