Controlling BLDC Motors: A Beginner’s Guide

The advantage of knowing the rotor position before engaging the coils is that it stops a sudden jerking of the rotor to match the position of the applied magnetic field. Of course, knowledge of the rotor position is critical throughout motor commutation, ensuring that the next correct pair of coils are engaged as the rotor rotates. The sensor’s feedback is also passed to the control algorithm, enabling speed to be maintained even as the load changes.