Re: [DIYbio] Building semicontinuous minicentrifuge with HD motor.

Dear Nathan,

I am using a motor with 4-wire and the resistance measurements were:
http://www.c2o.pro.br/en/automation/download/wiring_HD_motor.png

To control I assembled the circuit:
http://www.c2o.pro.br/en/automation/download/BLDC_controller_4_wires_MOSFET.jpg

And I'm using the code (Arduino):
http://bartvenneker.nl/schemas/Code_arduino_hdd.txt

That I found at:
https://www.youtube.com/watch?v=CMz2DYpos8w

Using a encoder from a mouse and a oscilloscope I measured a speed of
3500 rpm.

I have yet to fix two plates of acrylic (plexiglass) which will increase
the weight and I'll probably lose speed.

If I reduce minStepLength less than 1200 than the motor stops turning.

How can I optimize this code to increase the speed?

Thanks for the attention,
Markos

On 21-08-2014 04:05, Nathan McCorkle wrote:
> I've done some microstepper code using the hardware timers of an
> arduino, and I know a friend that did some BLDC code on a similar
> processor using back EMF.
>
> On Wed, Aug 20, 2014 at 8:01 AM, Markos<markos@c2o.pro.br> wrote:
>
>> Hi,
>>
>> I'm working on building a circuit (with MOSFET) and a software (with
>> Arduino) to control HD motors to be used in a DIY "semicontinuous"
>> minicentrifuge.
>>
>> Has anyone worked with these motor? (spindle motor, bldc motor, used in Hard
>> Disks)
>>
>> I would like to exchange information with someone with experience in
>> controlling these motors.
>>
>> Thanks,
>> Markos
>>
>>
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