DC motors are electric motors that are powered by direct current. Features include the ability to rotate at high speeds, and high starting torque. They are used in a wide range of situations, being a type of motor that is commonly found in numerous familiar applications. DC motors can be broadly divided into two groups: brushed DC motors and brushless DC motors.
This page goes into detail about how brushless DC motors work.
Brushless DC motors offer long life and ease of maintenance
Electric motors can be divided into a number of different types according to their characteristics, such as AC motors, stepper motors, and DC motors. Compared to the other types, DC motors benefit from high starting torque and the ability to rotate at high speeds. They do not suffer from the issues of slip or loss of synchronization.
DC motors can be further divided into brushed DC motors and brushless DC motors, depending on whether they have brushes (electrodes).
Brushed DC motors
These motors work by means of the mechanical linkage between their commutator and brushes. The brushes and commutator are in continual contact as the motor rotates. This causes wear of the motors by long-term use that can ultimately result in motor failure. For this reason, brushed DC motors have a shorter life than brushless DC motors, and require regular maintenance. Another disadvantage is the electrical and acoustic noise caused by the continual contact between the brushes and commutator as the motor rotates.
Brushless DC motors
Instead of brushes and a commutator, these motors use electronic means (a drive circuit) to rotate the motor. Having no brushes and commutator, which are both consumable parts, gives the motors a long life and makes maintenance easier. Another advantage is quiet operation as they do not suffer from the noise generated by the contact between brushes and commutator.