1. According to the type of working power supply: it can be divided into DC motor and AC motor.

      1) DC motors can be divided according to their structure and working principle: brushless DC motors and brushed DC motors.

      Brushed DC motors can be divided into: permanent magnet DC motors and electromagnetic DC motors.

      Electromagnetic DC motors are divided into: series-excited DC motors, shunt-excited DC motors, separately-excited DC motors and compound-excited DC motors.

      Permanent magnet DC motors are divided into: rare earth permanent magnet DC motors, ferrite permanent magnet DC motors and AlNiCo permanent magnet DC motors.

      2) Among them, the AC motor can also be divided into: single-phase motor and three-phase motor.

      2. According to the structure and working principle, it can be divided into: DC motor, asynchronous motor, synchronous motor.

      1) Synchronous motors can be divided into: permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors.

      2) Asynchronous motors can be divided into: induction motors and AC commutator motors.

      Induction motors can be divided into three-phase asynchronous motors, single-phase asynchronous motors and shaded-pole asynchronous motors.

      AC commutator motors can be divided into: single-phase series-excited motors, AC-DC dual-purpose motors and repulsion motors.

      3. According to the starting and running mode, it can be divided into: capacitor starting single-phase asynchronous motor, capacitor running single-phase asynchronous motor, capacitor starting running single-phase asynchronous motor and split-phase single-phase asynchronous motor.

      4. According to the purpose, it can be divided into: driving motor and control motor.

      1) Motors for driving can be divided into: motors for power tools (including tools for drilling, polishing, polishing, grooving, cutting, reaming, etc.), home appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders) , DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.) and other general small mechanical equipment (including various small machine tools, small machinery, medical equipment, electronic instruments, etc.) with motors.

      2) The control motor is divided into: stepper motor and servo motor, etc.

      5. According to the structure of the rotor, it can be divided into: squirrel induction motor (the old standard is called squirrel cage asynchronous motor) and wound rotor induction motor (the old standard is called wound asynchronous motor).

      6. According to the operating speed, it can be divided into: high-speed motor, low-speed motor, constant-speed motor, and speed-regulating motor. Low-speed motors are further divided into gear reduction motors, electromagnetic reduction motors, torque motors and claw-pole synchronous motors.

      In addition to the stepless constant speed motor, the stepless constant speed motor, the stepwise variable speed motor and the stepless variable speed motor, the speed regulating motor can also be divided into electromagnetic speed regulating motor, DC speed regulating motor, PWM variable frequency speed regulating motor and Switched reluctance motor.

      The rotor speed of an asynchronous motor is always slightly lower than the synchronous speed of the rotating magnetic field.

      The rotor speed of a synchronous motor is always maintained at a synchronous speed regardless of the size of the load.