
commutator
词源
源自拉丁语 commutare(意为'交换')+ 后缀 -tor,1839年首次用于电机领域,后延伸至数学。
noun
❶ 换向器,电机中用于改变电流方向的装置,通常由铜片和电刷组成,确保转子线圈电流方向周期性变化。
“The commutator reverses the current direction in the rotor windings.”
(换向器反转转子绕组中的电流方向。)
“A worn commutator can cause sparking in the motor.”
(磨损的换向器可能导致电机产生火花。)
❶ 数学中表示两个元素运算顺序差异的运算符,常见于群论和量子力学,计算公式为[A,B]=AB-BA。
“The commutator of position and momentum operators is iħ in quantum mechanics.”
(在量子力学中,位置与动量算符的对易子是iħ。)
“If the commutator equals zero, the operators are said to commute.”
(若对易子为零,则称算符可对易。)
常见短语
commutator segment — 换向器铜片,指组成换向器的单个导电部件,各段之间用云母绝缘。
“The damaged commutator segment was replaced during maintenance.”
(维修时更换了损坏的换向器铜片。)
commutator ripple — 换向纹波,因换向器切换电流产生的电压波动现象。
“Filter capacitors are used to reduce commutator ripple in DC power supplies.”
(滤波电容用于减少直流电源中的换向纹波。)