Stervo

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kb1gtt
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Stervo

Post by kb1gtt » Sat Mar 25, 2017 2:25 am

As part of my CNC efforts, I have created a PCB which I'm calling Stervo. That's STEpper seRVO. It takes step and direction pulses from a traditional stepper signal, and then uses a DC motor with encoder to do local PID control which gets you to a position, and prevents skipping steps.

This board is intended to handle 40A at 40V via H-Bridge motor control. It includes quadrature motor encoder, Allegro Hall current sensing, and several communications options. In these communications options I have CAN, industrial Fiber Optic, opto-isolated TTL and straight up TTL. The local PID is done by a local STM32. Most of the parts are sourced from sky-macau.com which makes for low cost assembly.

I have qty 5 of the below board.

IMG_20171231_075124101.jpg
IMG_20171231_075124101.jpg (475.38 KiB) Viewed 411 times
IMG_20171231_075104458.jpg
IMG_20171231_075104458.jpg (541.39 KiB) Viewed 411 times
If anyone finds it interesting and perhaps wants to review the circuit or comment, I have posted the files at the below link.
https://sourceforge.net/p/daecu/code/HE ... nk/Stervo/

This board could be used to drive pretty much any H-Bridge driven motor. Also if I need more torque, I have added an option to use servocity.com motors.
Last edited by kb1gtt on Mon Feb 26, 2018 2:35 am, edited 2 times in total.
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Re: Stervo

Post by russian » Sat Mar 25, 2017 2:33 am

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kb1gtt
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Re: Stervo

Post by kb1gtt » Sat Mar 25, 2017 9:32 am

Yeah, it's not a good name.

https://en.wiktionary.org/wiki/stervo

I guess this bitch is going to be the death of me :)
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Re: Stervo

Post by puff » Mon Apr 29, 2019 11:14 am

have you tried it in real harware, on a cnc machine?

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Re: Stervo

Post by kb1gtt » Mon Apr 29, 2019 10:37 pm

It is one of my many projects which are falling behind :( I have not powered it yet. I believe it just needs software.
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