driving a HDD motor

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Upon closer Inspection it seems like 6 pins are used for commutation and thereby control the speed. Those 6 pins are connected to a WD61C12-WM which seems to do more than just controling the motor speed. Guess I hit a dead end here.
Any easier ways to drive an HDD motor?

>>902044
>The commutation sequence is provided by the user via six inputs
In other words, you would need a microcontroller to cycle the IN pins to make the motor spin.

Something like the following does the commutation sequence automatically:
http://www.ti.com/lit/ds/symlink/drv11873.pdf

There are Chinese boards based on that or similar parts:
- Control by pot: http://www.ebay.com/itm/5V-12V-DC-Brushless-Motor-Driver-Board-Controller-for-Hard-drive-motor-3-4-wire-/181924211939
- Control by PWM: www.ebay.com/itm/DC-5V-12V-Brushless-Motor-Controller-Motor-Driver-Board-for-Hard-drive-motor-/171823612002

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>>902080
>microcontroller
>to cycle pins
>mfw 0.15$ shift register..

>>902595
I might actually do this. I got everything I need around, maybe I'll end up learning something.

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Ended up using a 74LS194, 74LS02 and a 555.
Now I have to cut away the drivers inputs and hook them up to this correctly. It should work since they are supposed to be TTL compatible.

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Alright, with the curent setup the motor does turn, but it's verry rough and turning up the frequency only results in desyncing and a complete stop.
I guess I need to commutate it like shown in the pic. How could I achieve this with 7400 series ICs?

>>904043
oh boy oh boy thats a sexy problem anon
i wish i could do it for you but im indisposed
you need a counter rigged to reset after 6
then a truth table. decade or bcd doesn't matter really.
then you make truth table with the outputs from your counter as inputs. make a separate table for a b and c and create a logic equation, use karnaugh maps if necessary. convert logic to gates.

>>904043
Since you don't need any speed...
Rig a decade counter like 74hc4017 or something to reset on count 6 and then just combine the outputs with diodes to form signals A/B/C. For example, A would combine states 0, 1 and 5.
No idea if that bit pattern of yours is correct.

>>904067
>No idea if that bit pattern of yours is correct
Well it makes sense to me. You see anything particular wrong?

>>904219
I wasn't criticizing, I meant it literally.

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>>904043

this problem has been solved many times. plenty of schematics exist already if you google.

>>904225
Your pic doesn't load for me. Would you mind sharing your keywords? I'm not a native speaker so I might have searched for the wrong terms.
Everything I could find was using the simple commutation sequence.

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I resorted to throwing an Arduino on it. It won't be permanent anyways.
Slight overlaping of the pulses made it work. Unless its running slow obviously.
Now that I hooked it up to a Microcontroller I might as well try PWMing 3 sine waves. I don't expect to much of it though, I think those motors are designed for block commutation.

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>>904225
>>904243
It loads fine, it's just black text on a transparent background, which makes some browsers blow chunks.