In this topic, you study the difference and similarities between brushed and brushless dc motors.
| Brushless DC motors | Conventional or brushed DC motors |
| It does not have brushes and commutator | it does have brushes and commutator |
| Permanent magnets are mounted on the rotor | Magnets are mounted on stator for small motors. Big motors do not have magnets. |
| It uses three phases of driving coils and current flows in same direction. | Current direction is reversed with the help of commutator. |
| A sensor tracks the rotor position and accordingly controller activates coil. | Now sensor in the rotor or stator. Stator/rotor is activated without feedback. |
| Due to lack of brushes and commutators, less maintenance | Brushes and commutator incurs regular maintenance. |
| Compact size and high speed range | Increased size |
Similarities between brushless DC motor and DC motor
- Both motors work on DC supply.
- Both motors have permanent magnets big conventional DC motors use wound wire coils instead of magnets.
- Both have stator and rotor.