Motor (Motor) is a device converts electrical energy into mechanical energy. (that is, it is the use of electricity coil stator winding) to produce a rotating magnetic field and used for rotor (such as closed cage aluminum frame) magnetoelectric power for rotary torque. Motor by using the power divided into dc motor and ac motor, electric power system in most of the motor is ac motor, can be synchronous motor or induction motor (motor stator magnetic speed and rotor rotating speed is not synchronized rate). Motor is mainly composed of stator and rotor, the direction of motion of the wire in the magnetic field force with the direction of current and magnetic induction line () in the direction of magnetic field direction. Working principle of the motor is a function of magnetic field on the current stress, to rotate the motor.
