Home range hoods, electric fans , ventilation fans, hair dryers, etc. with AC motor; electric shavers, electric bicycles , toy racing cars with DC motors.
The DC motor is an electric motor that converts direct current energy into mechanical energy. Because of its good speed performance in the power drag has been widely used. DC motor according to the excitation method is divided into permanent magnet, other excitation and self-excitation of three categories, of which self-excitation is divided into parallel excitation, series excitation and compound excitation of three kinds.
AC motor is a kind of alternating current electrical energy into mechanical energy device. AC motor mainly consists of an electromagnet winding used to generate a magnetic field or distributed stator winding and a rotating armature or rotor. Electric motors are made by utilizing the phenomenon of energized coils rotating under force in a magnetic field. AC motors are divided into synchronous AC motors and induction motors.
Main Uses
The AC motor is more efficient and has no smoke, odor, does not pollute the environment, and less noise. Because of its series of advantages, it is widely used in various aspects of industrial and agricultural production, transportation, national defense, commercial and household appliances, medical electrical equipment and so on.
When the DC power supply is supplied to the armature winding through the brushes, the conductor under the N pole on the surface of the armature can flow a current in the same direction, and the conductor will be subjected to a counterclockwise moment according to the left hand rule.
The surface of the armature under the S-pole part of the conductor also flows through the same direction of the current, also according to the left-hand rule of the conductor will be subject to counterclockwise direction of the moment. In this way, the entire armature winding that the rotor will rotate counterclockwise, the input DC energy is converted into mechanical energy output on the rotor shaft.