Pov using hard disk motor
I am try to rotate hard disk motor at particular rpm so that i can attach some led and program them to display desire result.
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The HD motor is kind of BLDC. For high speed and no stall, you need to interprete the back EMF, from the Motor, to switch at the rigt moment. Another way is to use a magnet and hall sensor for that, like its done in CD/DVD spindlemotors. One way to archieve this is to find out the driver chip on the HD, look for its datasheet and use it. Here you can find a lot about driving BLDCs http://www.microchip.com/design-centers/motor-control-and-drive/motor-types/bldc