Modern motors use electronic control systems rather than a commutator , but the principle is the same .
现代电动机使用电子控制系统替代整流器，但是原理一致。
Furiously he tested the spark-plugs , stared at the commutator .
他气呼呼地测试着火花塞，眼睛盯着转换器。
Commutator and brushes shall be free of grease , or other contaminants .
换向器和炭刷应无脂或其他污物。
And we also concern the bound of the norm of the commutator .
并且我们也可以去找到这类交换子的范数。
Traditionally , this current reversal was achieved with a rotary switch known as a commutator , which transmitted electricity to the windings through brushes that made contact with conductive strips which passed under them as the rotor turned .
