Il 22/11/2010 15:40, Andy Pugh ha scritto: > On 22 November 2010 14:23, Spiderdab<77...@tiscali.it> wrote: > > >> my stepper motors are these: >> http://www.goodluckbuy.com/nema-23-stepper-motor-12-6kgcm-1-8degre-4leads-56mm-57bygh56-401a.html >> > Those are quite short steppers, there are some about twice as long > with about twice the torque, > yes, i've found them for something like 30-40€ each.. and could be ok. > >> so, supposing to use my steppers and changing only the drive, how much >> voltage do you think can i apply to these? >> > The motors have a dielectric strength quoted of 500V AC for one > minute. They should work fine at 100V. The limiting factor is likely > to be the stepper drive. > that's what i was thinking.. > The stepper drive will limit the current to the set value, so > steady-state the voltage across the motor will be exactly the same as > it is now (about 2.5V). The advantage is that when the motor is > spinning rapidly it can still supply the same current with a 50V > back-emf. > didn't understand this part. have you got a name of a drive i could use? > >> 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. >> > That's a much more serious proposition, and will need real money. > Probably around EUR1000 per motor (for a 20Nm 400V AC servo). For > drives the Mesa 8i20 might be an option, though support in EMC2 is > still rather experimental. > i've seen that, and found it very interesting! a suggestion on where to find such motors?
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