armature copper loss

例句：

1. 1.The armature of the motor is made of copper.
   电机的电枢由铜制成。
2. 2.The armature of the generator is made of iron.
   发电机的转子由铁制成。
3. 3.The armature of the transformer is made of silicon steel.
   变压器的励磁绕组由硅钢制成。