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 motor-speed-control circuit in the figure shows an SG3524 pulse-width-modulation (PWM) IC, U2, ... Low-Cost Circuit Controls PM DC-Motor Speed. Sept. 29, 2003.

The circuit in the figure 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 from the ...

You can also use a single thyristor, a full-wave unsmoothed supply, and a pot to control the speed. The back-EMF from the motor switches the thyristor off when the voltage drops, the pot setting ...

He hooks up the SN754410 to two motors, giving him speed and direction control for both based on the duty cycle of a PWM signal entering the chip for less than $2.50.