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Gutted hard drives used as gyrosopes

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u4gubbins

New Member
Hello,
I have harvested the gubbins (guts) from two hard drives. I am trying to figure out how to make them run at full speed all the time so that I can use them as gyroscopes. They turn on for only a few seconds as things are now. presumably because the circuits are designed to shut down the spindle if anything is wrong with the drive.
I do not remember the brands of the drives.
these are three phase brushless motors. 12 volt
the driver chips are:
HA13626
and B996W0411 (I think this is the driver on this one, not 100% sure)

the first question is. since the motors and chips are still on the board, is there a set of pins I can jumper to make the motor go?

...and...

could the board be modified to better suit the task at hand?

if not, would I be better off to try get a tunable three phase BLDC driver or trying to reuse the chips that came with the drive?

note: I removed the case. arm and all other parts that are not needed, in order to reduce the weight.
 

Mr RB

Well-Known Member
Those driver chips are very sophisticated with error feedback and phase detection and a heap of stuff you don't really need.

I think it would be easier to scrap the ICs and just use a PIC and 3 FETs to drive the 3 phase windings. As long as you ramp the speed up from zero to the desired speed that should work fine for gyroscope use you can just run it at a set speed with the 3 phases switched by the PIC.
 

u4gubbins

New Member
I like PICs. that would reduce the size and weight a little as well.
I think the motors like a sine wave though. maybe a capacitor on each output, or maybe it doesn't care if it's sine or square?

I am not sure exactly how to tune it either.
do you adjust the on-time the off-ime or both?
as far as I know hard drive motors shouldn't need feedback, as they run at one or two set speeds. These have 4 wires so there is a chance the forth wire is the sensor, however I don't know how it works. just building a tunable circuit seems easier.
 
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