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GreekPIC

Hard dsk motor

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I dismantled a dead hard disk and I can't figure out the main motor. Is it a stepper? It has 4 contacts so I thought bipolar stepper. However if it was so, the two pairs should be isolated to eachother which is not the case. I tried to apply voltage in a sequence, it acts kind of like a low resolution stepper (~90

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check this http://home.cc.umanitoba.ca/~umparekh/hard_drive_clock.html




Well thanks but this doesn't really answer my question. This guy powers the HD and it spins up with it's own controller. But how can I use the motor alone with other electronics?

Nikolas

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The hard drive motor is not a stepper, however it is electronically commutated. The circuit is included in the drives electronics and varies between different manufacturers.

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I have also been attempting to use hard disk motors for some time, have found the driver chip on the old board, got the datasheet for the chip & they are not easy to wire up - the driver IC seems to use some kind of serial interface to the main drive controller, But the motors themselves are virtually the same as the motor in a DC brushless fan, might even be able to use a driver chip from one of those... The possibilities are endless...

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