That’s because brushless DC motors require carefully timed signals used in a process called Electronic Speed Control (ESC). [Fileark] built and ESC using an Arduino and has a couple of posts ...

The circuit in this Idea for Design provides three levels of speed control for a dc motor using a PC’s parallel port (LPT1). A C++ program performs the control functions by allowing the signals ...

The motor-speed-control circuit in the figure shows an SG3524 pulse ... A permanent-magnet (PM) dc motor produces a counter electromotive force (CEMF) at its terminals equal to the applied voltage ...