Closed loop steppers
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Hi,
Recently I have hear about closed loop control in stepper motor, adding propieties of a servo... The main consecuence is less steps lost. ..
- Someone uses it?
- A standard Nema. Can be upgrad. No?
- Can you give his opinion?
- Is it worth the benefits? (are problems supposed to be avoided by layer shifts)
- What problems have been encountered?
- Are they difficult to set up?
- Are they compatible with Duet? How?
- Having a speed limit?
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@peirof I'll no doubt get flamed for this but in IMO, closed loop steppers in 3D printers offer very little practical gain. My reasoning is that the usual causes of the print head, build plate or filament not reaching it's expected position are due to mechanical problems such as loose pulleys, belts jumping, collision of the nozzle on the printed part, blocked hot end or other such causes. Even if a motor skips steps, it is often caused my a mechanical issue. Whilst closed loop motor control would (should) ensure that the motor reaches it's demand position, it will not help if there are problems with the thing that is attached to that motor. In order to "close the loop", you have to measure the output and compare it with the input So in the case of a 3D printer, you'd have to measure the print head/bed/filament position using separate encoder and compare that with the demand position.
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@deckingman said in Closed loop steppers:
IMO, closed loop steppers in 3D printers offer very little practical gain.
I second that emotion.
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you have convinced me...
thx
