RuskinF wrote:You did not mention the hardware over here in the post.
It would be good if we get some more information on this page itself.
This would make us more susceptible to click on your links and view this information further.
More info on the 25K HDD. A hard disk motor is 3 phase, some have a 4th wire (some call this 4th phase). These motors have a microprocessor controller and driver (brushless electronic speed controller). I figured I could drive this type of motor with a simple single FET (I used IRFZ44N) and square wave generator.
I knew it would have a few limitations using such a simple drive circuit:
I know it would not be self starting (need three poles for that),
limited on acceleration,
limited on torque.
Of course I could just use a RC ESC and pwm servo tester, but that would be easy and way more costly.
The 3.8 million rpm is a completely separate project, all the info is in that video.