电力专业英语第九讲.pptx

电力系统专业英语;词汇;课文内容;Alternating-current generators, also called “alternators”, can be divided into three types according to the type of drive or prime mover. There are direct-connected engine-driven (steam or internal combustion) ac generators, water-wheel ac generators, turbine-driven ac generators. alternator[??:lt?ne?t?(r)]交流发电机; according to the type of drive or prime mover根据原动机驱动类型不同 steam or internal combustion蒸汽机或内燃机 water-wheel ac generators水轮发电机 turbine-driven ac generators涡轮驱动交流发电机;Operation Basically, the alternator operates on the principle of generator action-voltage is set up in coils of wire when they are moved in a magnetic field in such a way as to cut the magnetic lines of force. operates on the principle of generator基于发电机的工作原理运行 action-voltage 动作电压，工作电压，感应电压 coils of wire绕组线圈 when they are moved in a magnetic field in such a way as to cut the magnetic lines of force当他们在磁场中以切割磁力线的方式移动时;This is the same principle on which the dc generator operates. But there is a basic difference between dc generators and alternators in accomplishing the relative motion between coils and field. in accomplishing the relative motion between coils and field在磁场和绕组线圈间实现相对运动 ;In a dc generator, the magnetic field is set up by placing electro-magnetic field poles around the inside of the housing or stator. Coils are placed on the rotor so that when the rotor rotates, the coils are cutting across the magnetic lines of force set up by the poles and voltage is produced in the rotor coils. by placing electro-magnetic field poles around the inside of the housing or stator通过把电磁场的磁极放在外壳或定子内部 the coils are cutting across the magnetic lines of force set up by the poles and voltage is produced in the rotor coils线圈切割由定子中磁极所产生的磁力线，随之在转子中产生出电压;By the use of a commutator and brushes, voltage is taken from the rotor. In an ac generator, the electro-magnetic field—the source of the magnetic lines of force—is generally placed on the rotor and the coils in which the voltage is to be genera