Belt Driven Actuator
Belt Driven Actuator
(OP)
I plan to build an custom actuator driven by a servo motor with using a toothed belt. The load I want to move is 50 Kg on a distance of 48 inches with the speed of 6 m/s. How I should size the servo motor?
Thanck
Thanck





RE: Belt Driven Actuator
I think that you should check with servo system suppliers. They have compter programs where you just answer a set of questions and get the motor, gear, drive, encoder etc that does the work.
Gunnar Englund
www.gke.org
RE: Belt Driven Actuator
Also make sure the temperature of the servo is not a problem to the incoming wiring or gearbox it connects too.
As a loose rule I like to keep motor speed under 3000 rpm for noise among other things.
If you are using a belt make sure you size by tooth shear and not tensile. The best belt I have used for applications like yours is Gates PolyChain. They make special sprockets with a pitch diameter slightly above calculated if you want to reduce slop. I always just turned down the OD a few thousandths to tighten it up.
There are a couple of spreadsheets for sizing servos at: http://www.skadrives.com/engineering.htm
You can get in trouble with these very quickly if you start guessing at inertias. Most people don’t have a feel for inertia and it is very easy to guess off by a factor of 100 or more.
Give some more info on the load and acceleration.
Barry1961
RE: Belt Driven Actuator
I hope that can be usefull...
RE: Belt Driven Actuator
available. Check places like Baldor, MicroSyn, etc...
50 kg is a sizable load. Consider wrapped cable, especially
if you have considerable acceleration. 1/4" resolution is a
non-issue. Think old daisy-wheel printers. You may be able
to salvage all the parts you need off one if you can find
one still around, and the electronics are included. :)
<als>
RE: Belt Driven Actuator
Now divide your belt speed by the circumference of the drive wheel and you have the RPM's required. Check your textbook for the formula to derive Hp. from torque and RPM.
Don't forget to add a safety factor, and don't mix up seconds and minutes in your calculations.
yours
RE: Belt Driven Actuator
Barry1961
RE: Belt Driven Actuator