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Brushless Drill Motors
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marto
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Joined: 08 Jul 2004
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https://drive.google.com/file/d/0B3_io372eUBJcUxVdEhzSEpTTHc/view?usp=sharing

Comparator mapping
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Steven Martin
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Post Fri Aug 07, 2015 9:24 pm 
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marto
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The real question is which bloody port is A in my pinout.
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Post Fri Aug 07, 2015 9:46 pm 
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marto
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Hmmm the voltage pin in my pin def is marked same as the comparator one.....
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Post Fri Aug 07, 2015 10:19 pm 
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Valen
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"Governor" mode could well be useful as well.
It'd make bots drive straighter at least, the big gun boats people would like a governor mode on reverse too.
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Post Tue Aug 11, 2015 8:01 am 
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marto
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Step 0 is getting the pin map sorted and it working on SimonK. Been focussing on a few other things atm. And F$#%$# %$ destroying USB3 ports Sad

Hopefully I can get a prototype working by next weekend.
We will be at Sydney Maker Faire this weekend so come down and say hi if your about.

Steve
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Post Tue Aug 11, 2015 9:40 am 
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Valen
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taking out usb ports on a laptop is never fun :-<
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Post Tue Aug 11, 2015 12:18 pm 
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marto
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So that was easy once I worked out what I had done wrong. The mux for the ADC works in binary not on a Pin Mask. I was very confused how my voltage cutoff was working at all but it was just me reading it wrong.

I have SFA decent batteries left I ended up grabbing a random battery which had at some point in time being used for my middleweight and then ended up on a experimental robot which need to run for 12hrs straight. It is connected through some horrible assortment of clips and what not.

End result
http://youtu.be/odDJyD949g8

Seems to work ok. SimonK is a bit painful to read in assembly and there is lots of stuff in there we don't need. Honestly the reversing seems almost flawless on the bench motor hops around quite violently.

If I magically find some spare time amongst all the other things I do I shall setup a test platform tomorrow.

Steve
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Post Mon Aug 24, 2015 10:37 pm 
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marto
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I went to try and mount those gearboxes. And after 10min out in the shed was like nope too cold.

So I did some bad things to the shaft.
http://www.youtube.com/watch?v=kUHCNKTNtDw

Steve
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Post Tue Aug 25, 2015 9:31 pm 
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miles&Jules
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looks good.i want it...what motors are they?
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Post Tue Aug 25, 2015 10:34 pm 
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marto
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They are some massive in runners I bought ages ago for testing.
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Post Tue Aug 25, 2015 10:53 pm 
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Knightrous
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They are 4276-2300 Inrunners from hobbyking.
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Post Wed Aug 26, 2015 8:50 pm 
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Philip
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quote:
Originally posted by marto:
I went to try and mount those gearboxes. And after 10min out in the shed was like nope too cold.

So I did some bad things to the shaft.
http://www.youtube.com/watch?v=kUHCNKTNtDw

Steve
Would you say that you don't need sensored brushless motors to have good low speed drivability based on you experiments?

It is 20 degrees in Logan City at 3am. Just saying.
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Post Thu Aug 27, 2015 2:57 am 
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marto
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I would have to try it on a proper platform but that is my belief.

Steve
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Post Thu Aug 27, 2015 8:49 am 
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maddox



Joined: 21 Dec 2006
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Location: Belgium


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The versions in Nebelwerfer do the job nicely. But for feathers, I quess we'll have to experiment with larger diameter motors. And that's a problem with the Gimson GR02's. The pinions are ment for a 1/8" shaft.

(I could send a handfull of those pinions by post to get bored and reamed)

Anything with a 5mm axle can be fitted to the Robotpower Magnums. Unfortunatly, Customs and taxes make those unaffordable.

Post Thu Aug 27, 2015 3:11 pm 
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marto
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So I think Glen's drive with decimator has made a good case for the brushless drive train. Startup is still a bit jerky and the braking doesn't seem as harsh as it could be but seems usable.

Might try mounting the small motors I got on some drills when I get time.

Steve
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Post Thu Oct 29, 2015 10:28 am 
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