Brushless DC Motors

Brushless DC(BLDC) Motors are a better version of DC motors compared to Brushed DC Motors. As with any motor, there is a rotor and a stator. One side has sets of permanent magnets while the other has electromagnets(just coils of copper wire). By adding sensors, the motor can sense its position and control its speed by rapidly turning on a certain subset of the coils which pull it to the next position. Have high frequency switching circuits to continue through each subset of coils sequentially so that the motor continues turning through its angles. In order to abstract the control of this motor to a simple speed integer, an electronic speed controller(ESC) is used. This will turn a speed value into the proper activation of each separate coil to achieve the target speed. This can either be a separate device or baked directly into the motor. By nature, BLDCs are Servo motors.

When the user is given discrete control over each step of the BLDC, it is called a Stepper Motor.