AVR-Chat

Does anyone have any experience with creating an Atmel based motor
controller? These are commonly found in CD-ROMS and are extremely
efficient as well as last much longer than traditional brushed motors. 

Thanks for the help!!

> ... Does anyone have any experience with creating an Atmel based motor controller?

I've done a simple BLDD driver with a ATMega8535 (on a BX-24p).  I did 
it with three PWM phases, which yielded very slow slow low-torque 
rotation.  Getting speed from a BLDD requires feedback, I think you'll find.


Tom

>> ... Does anyone have any experience with creating an Atmel based motor
>> controller?
>
> I've done a simple BLDD driver with a ATMega8535 (on a BX-24p).  I did
> it with three PWM phases, which yielded very slow slow low-torque
> rotation.  Getting speed from a BLDD requires feedback, I think you'll
> find.

  I have RC aircraft ESC's for brushless motors that claim to be
sensorless and they are running at 10-20KHz with very respectable
torque.  So unless I'm misunderstanding what you are saying, it is
indeed possible to create fast and powerful controllers without sensors.

???
DLC
--
Dennis Clark

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> Tom
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> Yahoo! Groups Links
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> ... controllers without sensors.

Sure, but not without feedback.  I also use two ESCs, a Mamba 25 and an 
E-Flite 25, which both use _sensorless_ feedback to sense dynamic 
current and back-EMF.  I'll bet yours do, too.


Tom

>  > ... controllers without sensors.
>
> Sure, but not without feedback.  I also use two ESCs, a Mamba 25 and an
> E-Flite 25, which both use _sensorless_ feedback to sense dynamic
> current and back-EMF.  I'll bet yours do, too.

  Ahh, that makes sense - I didn't make that obvious connection.  I've
created the same in PID loops.

DLC
--
Dennis Clark

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> Tom
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> Yahoo! Groups Links
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>

I have not

   
   
  
Brandon <brandont@houston.rr.com> wrote:
          Does anyone have any experience with creating an Atmel based motor
controller? These are commonly found in CD-ROMS and are extremely
efficient as well as last much longer than traditional brushed motors. 

Thanks for the help!!



         

 
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I have notwho 

   
   
  
Brandon <brandont@houston.rr.com> wrote:
          Does anyone have any experience with creating an Atmel based motor
controller? These are commonly found in CD-ROMS and are extremely
efficient as well as last much longer than traditional brushed motors. 

Thanks for the help!!



         

       
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[Non-text portions of this message have been removed]

The comercaly avalibe motor controlers are avalible and I could just
buy one and add it to my AVR robot project. But that is not what I
want to do. My interest is to understand all process of my project and
it is just fun to do. 

Did you do bi-dirctional? 
I think I could do the AD compare with a resistor ladder going one
directon but I woudl really like to go in both directions. If you have
any sample code or data you could share that would be great!! Thanks all!

--- In AVR-Chat@yahoogroups.com, Tom Becker <gtbecker@...> wrote:
>
> > ... Does anyone have any experience with creating an Atmel based
motor controller?
> 
> I've done a simple BLDD driver with a ATMega8535 (on a BX-24p).  I did 
> it with three PWM phases, which yielded very slow slow low-torque 
> rotation.  Getting speed from a BLDD requires feedback, I think
you'll find.

> 
> 
> Tom
>

> Did you do bi-directional? 

No, but that's simply phase reversals.  Here's the thread on the BX-24 
group: http://tech.groups.yahoo.com/group/basicx/message/21902 .


Tom