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

(1) According to the structure and working principle, DC motor can be divided into brushless DC motor and brushless DC motor.

Brushless DC motor can be divided into permanent magnet DC motor and electromagnetic DC motor.

Electromagnetic DC motor is divided into series excited DC motor, shunt excited DC motor, separately excited DC motor and compound excited DC motor.

Permanent magnet DC motor is divided into rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and aluminum nickel cobalt permanent magnet DC motor.

(2) 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 and synchronous motor.

(1) Synchronous motor can be divided into permanent magnet synchronous motor, reluctance synchronous motor and hysteresis synchronous motor.

(2) Asynchronous motor can be divided into induction motor and AC commutator motor.

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

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

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

4. It can be divided into drive motor and control motor.

(1) Drive motor can be divided into: electric tools (including drilling, polishing, polishing, slotting, cutting, reaming and other tools), household appliances (including washing machines, fans, refrigerators, air conditioners, tape recorders, video recorders, VCRs, vacuum cleaners, cameras, hair dryers Motor for electric shaver and other general small mechanical equipment (including various small machine tools, small machinery, medical instruments, electronic instruments, etc.).

(2) Control motor is divided into stepping motor and servo motor.

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

6. It can be divided into high-speed motor, low-speed motor, constant speed motor and speed regulating motor according to operation speed. Low speed motor is divided into gear motor, electromagnetic motor, torque motor and claw pole synchronous motor.

Speed regulating motor can be divided into step constant speed motor, stepless constant speed motor, step variable speed motor and stepless variable speed motor. It can also be divided into electromagnetic speed regulating motor, DC speed regulating motor, PWM frequency conversion speed regulating motor and switched reluctance speed regulating motor.

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

The rotor speed of synchronous motor has nothing to do with the load, but always keeps synchronous speed.