The Advantages and disadvantages of DC motors
 
Advantages of DC motors:
1. Good starting and speed regulation performance, wide and smooth speed regulation range, strong overload capacity, and little influence by electromagnetic interference;
2. The DC motor has good starting characteristics and speed regulation characteristics;
3. The torque of the DC motor is relatively large
4. Maintenance is relatively cheap;
5. The DC of the DC motor is more energy-saving and environmentally friendly than the AC.
 
Disadvantages of DC motors:
1. DC motors are more expensive to manufacture and have carbon brushes;
2. Compared with asynchronous motors, DC motors are complex in structure, inconvenient to use and maintain, and use DC power;
3. The complex structure limits the further reduction of the volume and weight of the DC motor, especially the sliding contact between the brush and the commutator causes mechanical wear and sparks, which make the DC motor have many failures, low reliability, short life, and maintenance. Maintenance workload is high.
4. The commutation spark not only causes electrical corrosion of the commutator, but also a source of radio interference, which will have a harmful effect on the surrounding electrical equipment. The larger the capacity of the motor and the higher the speed, the more serious the problem. Therefore, the brushes and commutators of ordinary DC motors limit the development of DC motors to high speed and large capacity.