This article compares brushless DC motors with brushed DC motors in terms of their construction, principle of operation, advantages and disadvantages. It also compares brushless DC motors with DC series and shunt motors. Brushless DC motors have no brushes and commutators, and are controlled electronically. They are more efficient and last longer, but have a higher initial cost. Brushed DC motors have brushes and commutators, and are less efficient and generate more noise. DC series and shunt motors have brushes and commutators, and are simpler and cheaper to control, but have a shorter lifespan and require regular maintenance.