Dc motor:
According to the structure and working principle, it can be divided into brushless DC motor and brushed DC motor.
It can also be divided into permanent magnet DC motor and electromagnetic DC motor.
Permanent magnet DC motors are divided into rare earth, ferrite and Al-Ni-Co permanent magnet DC motors according to materials.
Electromagnetic DC motors are divided into series excitation, parallel excitation, separate excitation and compound excitation DC motors according to excitation modes.
AC motors can be divided into single-phase motors and three-phase motors.
2. According to the structure and working principle, it can be divided into DC motor, asynchronous motor and synchronous motor.
The rotor speed of asynchronous motor is always slightly lower than the synchronous speed of rotating magnetic field.
Regardless of the load, the rotor speed of the synchronous motor is always kept at the synchronous speed.
3. According to the purpose, there are drive motors and control motors.
4. According to the running speed, there are high-speed motors, low-speed motors, constant-speed motors and variable-speed motors.
Low-speed motors are divided into gear reduction motors, electromagnetic reduction motors, torque motors and claw-pole synchronous motors.