Mesa 5i20 + steppers + encoders
- moto233racer
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27 Aug 2013 21:40 #38154
by moto233racer
Mesa 5i20 + steppers + encoders was created by moto233racer
Feel like this is a stupid question but I haven't found it explicitly spelled out...
Can I use a mesa 5i20 with stepper motors in a closed loop in LinuxCNC?
Based on what I've read it seems like it should work, but I wasn't sure if the feedback options in PNCconf are only available with servos...
Thank you in advance!!!
Can I use a mesa 5i20 with stepper motors in a closed loop in LinuxCNC?
Based on what I've read it seems like it should work, but I wasn't sure if the feedback options in PNCconf are only available with servos...
Thank you in advance!!!
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- andypugh
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28 Aug 2013 00:08 #38160
by andypugh
The issue with steppers is that "more" can only be interpreted as a faster step rate, and that tends to reduce torque, making things worse rather than better.
But if you were to create a servo config (or start with the demo servo config) then change the pwmgens to velocity-mode stepgens (by hand, with a text editor) then you would be close.
Replied by andypugh on topic Mesa 5i20 + steppers + encoders
Possibly. It depends on what loop you want to close, and how you plan on closing it.Can I use a mesa 5i20 with stepper motors in a closed loop in LinuxCNC?
The issue with steppers is that "more" can only be interpreted as a faster step rate, and that tends to reduce torque, making things worse rather than better.
There are lots of things that you can do in LinuxCNC that PNCConf doesn't support.Based on what I've read it seems like it should work, but I wasn't sure if the feedback options in PNCconf are only available with servos.
But if you were to create a servo config (or start with the demo servo config) then change the pwmgens to velocity-mode stepgens (by hand, with a text editor) then you would be close.
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- tenaja
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29 Aug 2013 11:37 - 29 Aug 2013 11:38 #38201
by tenaja
Replied by tenaja on topic Mesa 5i20 + steppers + encoders
Yes, I am doing it, however, it is not thoroughly closed loop. I use the encoder to detect stalls, and that is it, so there is no error or stall compensation--just an error for now--and it works fine for that.
With a high voltage power supply, the system makes for a reasonable balance between speed and power when a servo is too expensive.
With a high voltage power supply, the system makes for a reasonable balance between speed and power when a servo is too expensive.
Last edit: 29 Aug 2013 11:38 by tenaja.
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