[Hỏi đáp - Tiếng anh chuyên ngành] Bạn có nick linhdongnai ( chắc là bạn tên Linh, sống ở Đồng Nai :D) cầu viện: Em có đoạn tiếng anh chuyên ngành mà dịch mãi không xuôi, nhờ anh chị giúp đỡ ạ: " To put it another way, commutators keep the current flowing in one direction instead of back and forth. They accomplish this task by keeping the polarity of the brushes stationed on the outside of the generator positive. The commutator is made up of copper segments, with a pair (of segments) for every armature coil being insulated from all the others. The stationary brushes, which are graphite connectors on the generator, form contact with opposite parts of the commutator. As the armature coil turns, it cuts across the magnetic field, and current is induced. At the first half turn of the armature coil (clockwise direction), the contacts between communicator and brushes are reversed. The first brush now contacts the opposite segment that it was touching during the first half turn, while the second brush contacts the segment opposite the one it touched during the first half turn. By doing this, the brushes keep current going on one direction, and deliver it to and from its destination. When a DC generator contains only a single coil, it provides a pulsating dc output. Therefore, scientists use a number of coils to produce a more stable output ---------------------- Bạn nào có thể giúp bạn linhdongnai thì cmt trực tiếp dưới bài post giúp bạn ý nhé. :)
Posted on: Fri, 23 Aug 2013 07:54:04 +0000