RAMPSSB: Closed Loop DC servo drivers for RAMPS November 17, 2017 07:30PM |
Registered: 7 years ago Posts: 17 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 18, 2017 02:55AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 18, 2017 01:00PM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 18, 2017 01:10PM |
Registered: 7 years ago Posts: 17 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 02:27AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 02:39AM |
Registered: 7 years ago Posts: 17 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 04:01AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 09:36AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 09:43AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS November 19, 2017 01:49PM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 17, 2018 11:50AM |
Registered: 6 years ago Posts: 63 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 17, 2018 02:08PM |
Registered: 9 years ago Posts: 5,232 |
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Most only last a day or too... sigh.
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 17, 2018 02:16PM |
Registered: 6 years ago Posts: 63 |
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o_lampe
I hear you... The only way to make this last is with brushless motors. Low kV pancake brushless outrunners to be exact.
Most of the RC-brushless stuff has no hall-position sensors. But equipped with sensors, there are no small enough controllers.
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 17, 2018 09:33PM |
Registered: 7 years ago Posts: 17 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 17, 2018 09:33PM |
Registered: 7 years ago Posts: 17 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 18, 2018 03:31AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 18, 2018 07:43AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 18, 2018 10:22AM |
Registered: 6 years ago Posts: 63 |
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o_lampe
Is it PWM control you are using to regulate the brushed motors?
BTW: Have you seen the video of my balancing bot with BLDC motors? It goes back and forth and stands still, just like we need for an extruder. But these gimbal motors are pretty weak.
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 19, 2018 04:38AM |
Registered: 9 years ago Posts: 5,232 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 25, 2018 10:07AM |
Registered: 6 years ago Posts: 63 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 25, 2018 01:08PM |
Registered: 12 years ago Posts: 335 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 25, 2018 01:39PM |
Registered: 10 years ago Posts: 14,684 |
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warbunniex
You guys would probably have the best answer for this.
I was reading about some filament measuring sensor the duet guys are working on and I realized if I'm doing a dc servo..then it basically has built in filament measuring if done right. That got me thinking.... We could stick with Bowden extruders and just move the encoder down to the end of the tube just above the hotend. That way you get the responsiveness of a direct drive with the light weight of a Bowden.
Would that not work? Is there something I am forgetting?
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 25, 2018 03:46PM |
Registered: 6 years ago Posts: 63 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 26, 2018 02:35AM |
Registered: 9 years ago Posts: 5,232 |
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dc42
Yes I think that could be made to work. The firmware would probably need a model of the behaviour of the Bowden system so that it can use feedforward and not just feedback - in effect, variable pressure advance controlled by feedback.
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS April 26, 2018 09:52AM |
Registered: 6 years ago Posts: 63 |
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o_lampe
How about an automated PID tuning algorhythm?
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS May 13, 2018 11:25PM |
Registered: 10 years ago Posts: 20 |
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warbunniex
You mentioned you were having trouble with the firmware side of things. Have you seen this yet?
[github.com]
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS May 17, 2018 03:40PM |
Registered: 6 years ago Posts: 63 |
Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS May 17, 2018 09:38PM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS May 18, 2018 08:28AM |
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Re: RAMPSSB: Closed Loop DC servo drivers for RAMPS May 18, 2018 10:12AM |
Registered: 6 years ago Posts: 63 |
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pamalofeev
Sorry for my bad english..
I wanted to say that this is more correct, but not 100%. There is a position loop, a speed loop and a torque loop. Usually, a torque loop is not used, but a current loop with a sensor. These three loops are necessary for quality work.