Hi,
before posting here I read all app notes and searched in internet a lot.
All that i found speaks about 3 wire motors. But harddisk motor has 4 
wires! So i have some doubts on these!
The motor has no sensors. (I opened one...)
      Nicola


Tamas Rudnai wrote:
> Hi Nicola,
>
> That is a BLDC motor (Brush Less DC motor). There are couple of app notes on
> driving such a motor at Microchip web site if you look at the motor control
> notes.
>
> What you should know is that generally speaking you do not need the common,
> and for HD motors most of the times there is no sensor therefore you should
> look at the sensorless notes I think. If you look for sensored motors you
> should be able to get one from CD ROMs.
>
> For the basics MC app notes are definitely good sources, you can even find
> one with digital filtering the back EMF (you will see what is that). I think
> there is even a controller written in assembly, so should be fun.
>
> Tamas
>
>
>
> On Thu, Apr 10, 2008 at 4:55 PM, Nicola Perotto <nicola@nicolaperotto.it>
> wrote:
>
>   
>> Hi all,
>> i have a harddisk motor and want to control it.
>> The motor is brushless but have 4 wire, the fourth is  a common.
>> I haven't found anything in the internet about this... any suggestion?
>> Thanks
>>      Nicola
>>
>>
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>>     
>
>
>
>   
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