Motors are a type of equipment that converts electrical energy into mechanical energy. It utilizes an energized coil (i.e. stator winding) to generate a rotating magnetic field and act on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric rotational torque. Electric motors are divided into DC motors and AC motors according to the different power sources used. Most of the motors in the power system are AC motors, which can be synchronous or asynchronous motors (the stator magnetic field speed of the motor does not maintain synchronous speed with the rotor rotation speed). An electric motor mainly consists of a stator and a rotor, and the direction of the force acting on the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic induction line (magnetic field direction). The working principle of an electric motor is the effect of a magnetic field on the force acting on the current, causing the motor to rotate.

Some types of these machines can be used as electric motors or generators. It is a machine that converts electrical energy into mechanical energy. Usually, the working part of an electric motor rotates, and this type of motor is called a rotor motor; There are also linear motors that move in a straight line, called linear motors. Electric motors can provide a wide range of power, from milliwatts to kilowatts. Machine tools, water pumps, belt conveyors, fans, etc. require electric motors to drive them; Electric locomotives and elevators require electric motor traction. Fans, refrigerators, washing machines, and even various electric toys in family life cannot do without electric motors. Electric motors have been applied in various aspects of modern social life.