ON 20040217@1:57:41 PM at page:
http://www.piclist.com/techref/io/stepper/linistep/index.htm#38033.1661689815
James Newton[JMN-EFP-786] Published and replied to post 38033.1661689815 by stebbo
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stebbo@newsguy.com asks:
Hi,
Your controller looks like what I'm after, but maybe you could verify. I'd like to control from a PC a roller-blind type projector screen. Rotational speed from the motor would only need to be somewhere between 2 - 5 rev/s, the rod for the blind (being 80" long) would be light and the screen a light material, so I assume a 1A/phase stepper motor would do the job. Would I be able to get away without extra heatsinking/fans considering I'd be only driving the motor continuously for 10 seconds, then nothing for hours (assuming optimal PSU)? Or is heat generated at idle?
Thanks
Simon
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With regard to my question below, I've done a big more research and found that I'm going to need around 160 in. oz. of torque. Haven't been able to find such high torque steppers that are around 1A/phase - do they exist?
Also with the heat sink, I just realised that although I'll only be stepping the motor very rarely, the stepper motor will be holding its position for hours on end, so I presume there will some heat dissipation here.
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