换向云母板
mica board for commutator
辅助转向换向器阀
supplemental steering diverter valve
补偿式换向器电动机
compensated commutator motor
大型无换向器电机技术
Large Pole-changer-free Electric Motor Technology
单相并激换向器电动机
single-phase shunt commutator motor
单相串激换向器电动机
single-phase series commutator motor
当代大型无换向器电机
the large non-commutator machines now