Originally Posted by
Josh Leber
3. This option I know little about so any input here will be especially valued. Steppers with piggyback encoders and drives capable of making slip/skip corrections based on the encoder output. Closed loop operation right? Sounds like the best of both worlds. The stepper's synchrounouse controll of shaft movment and high tourq at reletivly low speeds coupled with a servo's ability to recalculate movement in real time incase of a slip/skip.
In my opinion, if you are going to fit encoders, then you may as well use the much better advantage of servo's.
Originally Posted by
Josh Leber
Servos require a big speed reduction for my application wheras steppers do not (2000-3000 rpm ~ vs ~ 100-300 rpm)(I see this as a signifigant atvantage in favor of the steppers)
You are going to need the same motor/torque characteristics in order to meet the required inertia motor-to-load matching, that is required by your accel/decel requirements as well as max feed rate.
The use of reduction enables efficient motor sizing/specifications.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.