servo advice please

[draughted]

hi i am just a little curious at the moment about the fact servos do not lose steps with a computer with bad latency, but i am told do not go to the same resolution as a stepper.

so could anyone tell me the basic types of servo, new and old
and wether my G540 is worth replacing, given it suits my power requirements.

do they suffer interference the same as steppers. i'm under the belief many of my stuffups are caused by bad electrical interference

generally i'm looking to get the best system i can afford.

[H.O]

Hi,
A badly designed and implemented servo-system will work just as bad (or worse) than a badly designed and implemented stepmotor system. Saying that a servomotor can't lose steps is only partly correct.

If you overdrive a stepmotor it will lose steps and/or stall out, if you overdrive a servomotor it "fall behind" the target position until it's so far off that the drive (or controller) will fault, how far this is is usually setable.

That doesn't mean a servosystem is immune in any way, if it's implemented badly you might get noise on the encoder signals fooling the drive (or controller) into thinking the motorshaft is in a position where it in reality isn't. The effect is just the same as with the step-motor being overdriven and losing steps - you get inconsistent positioning, ruined parts etc etc.

The resolution you get depends on the line count of the encoder, a 500 line encoder will give you 2000 "steps"/rev, a 4000 line encoder will give you 16000 "steps"/rev.

[draughted]

if thats the case then i'm happy as is.

i suppose the way things are done with steppers is not that different. i was just looking for that bullet proof ideal system that doesn't exist.

all things have there faults, even me.