sci.physics.electromag

"Benj" wrote in message
news:1194888701.936803.58940@19g2000hsx.googlegroups.com...
>
> Robert Miller wrote:
>> What is the inherent disadvantage if any to a stepper style motor scaled
>> up
>> to
>> the 1/4 hp to 1/2 hp range. Using 16 to 24 NdFeB Disc, 1 in. x 1/4 in.
>> 12,700
>> Gauss or larger magnets with and 64 to 96 coils. Is the weight
>> prohibitive?
>> or
>> some factor I haven't considered?
>
> I'm not sure why you are so stuck on stepper-type motors. Generally
> speaking they don't come in high power ratings and tend to have lots
> of disadvantages. The main advantage (you can digitally position them
> without sensors) means little in your application as far as I can
> tell. Even in large robots the typical thing is to use standard high
> power DC or other motor and use position sensors to give positional
> feedback for positioning them.
>

My reasoning is that I am more familiar with stepper motor design, I don't
need more than 500 rpm, but I do need 1/4 to 1/2 hp. This would be a
simple matter with a stepper type design, but I'm not ruling out other
designs.
Since I will build the motor myself I was think of keeping it simple
provided
there was not a much better alternative.


Thanks again!

Robert