Re: [Emc-users] more powerful nema23 need.

[Spiderdab <77...@ti...>]

Il 22/11/2010 12:26, Andy Pugh ha scritto:
> On 22 November 2010 10:50, Spiderdab<77...@ti...>  wrote:
>
>    
>> i would like to know if you know about nema23 motors (either stepper or
>> servo) with more (kind of double..) torque.
>>      
> They do exist but might not give you the advantage you expect. My
> limited experience is that the bigger motors become rather slow, in
> that the torque drops off more rapidly with speed than the smaller
> motors, and you are then into an area of diminishing returns.
>
> You might be better reducing the drum diameter and increasing the
> drive voltage. This will give you more wire tension and the higher
> voltage should allow you to run the motors faster. This might need new
> stepper drivers and power suppliesas I am talking about probably going
> to 60 or 70V.
>
> For this sort of high-speed work I think that servos are almost
> certainly a better choice, however they are not especially cheap. If
> you do go with a servo system then I would strongly suggest looking at
> the drives from Pico and Mesa which offload all the computational work
> to the PC and EMC2. This will be both cheaper and more satisfactory.
> http://pico-systems.com/motion.html
> http://www.mesanet.com (of particular interest will be the 7i39 and 8i20)
>
>    
my stepper motors are these:
http://www.goodluckbuy.com/nema-23-stepper-motor-12-6kgcm-1-8degre-4leads-56mm-57bygh56-401a.html
...and with this power supply:
http://www.trcelectronics.com/Meanwell/sp-320-24.shtml
so, supposing to use my steppers and changing only the drive, how much 
voltage do you think can i apply to these?

Than i'm interested in learning how to use servos and closed loop, so 
i'm reading much on discussions about this. that's why people are asking 
me to use this system to move a camera of about 20-30kg. so i'll need a 
more serius/powerful/precise system.. i'm going to ask about in a later 
moment.
thanks.