Let's Make Robots!

BLDC HDD motor driver


My brother and I have been working on building a propeller clock and have salvaged two old harddiskdrive motors for the project. Our knowledge with these BLDC motors is very limited though and we are not sure how to build our own driver circuit.

The first motor has 3 leads and while the PCB from that harddisk is fried now, I did get the opportunity to take some measurements. Between one of the leads and the two others I measured a 7V and a 12V squarewave at 3.4kHz.