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As for detecting the torque applied, just measure the motor wanting to spin on it's mounts. You could also detect slipping this way as well by an unexpected drop of that torque, probably.
Hmm.. Well for detecting the drive slipping you could just put an encoder on your filament idler and see if that matches the steps you are sending. Assuming you have a filament idler..
As for detecting the torque applied, just measure the motor wanting to spin on it's mounts. You could also detect slipping this way as well by an unexpected drop of that torque, probably.
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I'm surprised that nobody has yet pointed out that Trinamic
stepper drivers that support stall detection already provide load
sensing. It's only updated every full step, but I suspect that any
load sensing method based on motor back emf would have that
limitation.
David Crocker, Duet3D Limited
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On November 29, 2019 at 20:48:57, Ryan Carlyle (temp...@gmail.com) wrote:
Right, just having it spin 1:50 would be useless and difficult to build without it locking up, which is why I want to rig up some subtraction gearing to only show the difference between a loaded motor and unloaded motor.
Although now I’m wondering, would there be a way to spin a camera or a mirror to make a spinning dial look stationary so you can read a load angle off it? Hmm.
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On November 29, 2019 at 21:08:10, Ryan Carlyle (temp...@gmail.com) wrote:
I have some mechaduino boards. Could do that. Just don’t have the bandwidth to get up to speed on their build environment and figure out how to do what I want.
The actual encoder is pretty slick, it’s just a chip that measures magnetic field orientation (like a compass) that sits over the magnet you glue to the rear rotor. Not sure if it ended up being precise enough for proper field-oriented control, seems like they ended up just using it to check for skipped steps. Might have been a clock speed polling frequency issue though, I don’t recall. There’s a mechaduino google group but it’s long fallow.
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