Electric motors and generators have several structural features in common. Each consists of a stator that provides a magnetic field and a rotor that rotates within the magnetic field. In both motors and generators the magnetic field may be supplied either by permanent magnets or by electromagnets. The rotor in both an electric motor and a generator consists of coils of wire wound on a laminated iron armature and connected through brushes to an external circuit.
An electric motor and a DC generator are similar in that their rotor coils are connected to the external circuit through a split-ring commutator. An AC generator is different as its rotor coils are connected to the external circuit through slip rings. An AC induction motor is different from a generator as its rotor coils are not connected to an external circuit and its field is always supplied by electromagnets.
The function of an electric motor is the reverse of the function of a generator. An electric motor converts electrical energy into mechanical (usually rotational) energy. A generator converts mechanical (usually rotational) energy into electrical energy. A motor rotates when current is supplied while a generator supplies current when rotor is made to rotate. It is possible to have a DC motor act as a generator by providing the energy to rotate the armature containing the coils.
Find the equivalents of following word combinations. | Read and translate the text. | Complete the sentences with given words. | Gerund constructions. | Переведіть на англійську мову. | Повторення герундія і герундіальних оборотів | Unit 4. | Brushes and brush rigging | Answer the questions. | Grammar exercises. |