What is the difference between brushless DC motors and brushed DC motors?
Difference 1: Different working principles
Working principle of
DC brushless motor: A magnetized permanent magnet is attached to the rotor of the motor to detect the polarity of the motor rotor, and the driver controls the start, stop, and braking of the motor; Control the on/off of each power transistor in the inverter bridge to generate continuous torque; Control and adjust the speed, as well as provide protection and display, etc.
Working principle of DC brushed motor: When the motor rotates, the carbon brush slides on the commutator, generating a rotating magnetic field that attracts the static magnetic field of the stator. The current in the armature and stator windings is supplied by the battery or other DC power source to provide a constant DC voltage to the battery (or DC power source).
Difference 2: Different structural composition
A brushless DC motor consists of a motor body and a driver. The stator winding of the motor is mostly made into a three-phase symmetrical star connection, and the driver is composed of power electronic devices and integrated circuits.
The basic components of a DC brushed motor include stator, rotor, brushes, and commutator. The interaction between the stator and rotor magnetic fields drives the motor to rotate.
