What are the differences between BLDC brushless motors and ordinary motors?

BLDC stands for "brushless DC." A BLDC motor is a type of electric motor. Although it is called a brushless DC motor, it is actually a form of AC motor. The stator windings of a BLDC motor are typically designed as a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. The rotor of the BLDC motor is equipped with pre-magnetized permanent magnets. To detect the polarity of the motor's rotor, a position sensor is installed inside the motor.

The BLDC motor driver is composed of power electronic devices and integrated circuits. Its functions include: receiving start, stop, and brake signals to control the motor's starting, stopping, and braking; receiving position sensor signals and forward/reverse signals to control the switching of the power tubes in the inverter bridge, thereby generating continuous torque; receiving speed commands and speed feedback signals to control and adjust the rotational speed; and providing protection and display functions, among others.