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Home Forum Configuring LinuxCNC Basic Configuration Best way for feedback with RC ESC spindle?

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TOPIC: Best way for feedback with RC ESC spindle?

Best way for feedback with RC ESC spindle? 24 Apr 2012 10:14 #19497

  • CptanPanic
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I like the idea of having a closed loop spindle controller, and see all the software is available in LinuxCNC. What is the cheapest way to get feedback from the motor back into LinuxCNC?
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Re:Best way for feedback with RC ESC spindle? 24 Apr 2012 14:20 #19508

  • BigJohnT
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Some folks build an encoder using opto sensors and a disk with slots on it.

John
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Re:Best way for feedback with RC ESC spindle? 25 Apr 2012 02:13 #19515

  • ArcEye
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Some folks build an encoder using opto sensors and a disk with slots on it.
Something like this
www.linuxcnc.org/index.php/english/compo...imit=6&start=6#14832

with an opto switch circuit like this
www.linuxcnc.org/index.php/english/compo...id=26&id=17960#18093

regards
Last Edit: 25 Apr 2012 02:43 by ArcEye.
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Re:Best way for feedback with RC ESC spindle? 25 Apr 2012 08:31 #19529

  • CptanPanic
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With a brushless motor, shouldn't you be able to get rpm from sensing pulses on a motor line?
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Re:Best way for feedback with RC ESC spindle? 25 Apr 2012 08:53 #19531

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With a brushless motor, shouldn't you be able to get rpm from sensing pulses on a motor line?
Yes, if you know how to build a circuit to do that and can eliminate other interference.

You just need to be able to sense the 'blip' as each pole rotates and then divide by number of poles to get RPM.
Afraid I don't know how practically you do it though.:(

regards
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Re:Best way for feedback with RC ESC spindle? 26 Apr 2012 05:53 #19553

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I found this : www.hobbyking.com/hobbyking/store/uh_vie....asp?idProduct=17552 that someone (diydrones.com/forum/topics/brushless-mot...6002&page=2#comments) has connected the output to an arduino, and was able to get 1 pulse per rpm. The only problem was the arduino was only able to capture to 14000 rpm. Can this output be instead connected to an input port in linuxcnc, and capture the full rpm?
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