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Building lipo packs
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 Posted: Fri May 17th, 2013 04:33 pm
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mwiz64
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If space was really limited, one could likely replace the large gauge wire with smaller stuff and you could also replace that connector with some other small 3 pin connector.

Hansen Hobbies makes all sorts of nice kits for building your own connectors.

http://www.hansenhobbies.com/products/connectors/

If you decide making your own is a good way to go, get their crimping tool and watch their video. It's super easy and beats the heck out of soldering.



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 Posted: Fri May 17th, 2013 04:46 pm
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mwiz64
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Anybody want a really nice lipo charger for the money?

http://www.revolectrix.com/m4_description_tab.htm

You'd likely never out grow the Multi 4 if all you are going to do is charge lipos for trains. You might not outgrow it ever even if you do get into charging higher power stuff. For an extra $20 you can get a transformer that will allow you to run it off 110v AC as well as 12v DC. For around $80 that's quite a deal, IMHO.

I'm not affiliated with FMA or Revolectrix an anyway. I'm just a very happy end user of their products.

Last edited on Fri May 17th, 2013 04:48 pm by mwiz64



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 Posted: Fri May 17th, 2013 04:58 pm
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mwiz64
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It's PWM and with my ESCs you can adjust it. I generally don't however. Ill have to go into the software to get the range for you as I don't recall.

Herb Kephart wrote:
Mike---

Do the brushless motors that the RC industry seems to be going to control the speed by PWM or by controlling the frequency of the polyphase input to the motor?

IF it is PWM, what frequency is used?


Herb



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 Posted: Sat May 18th, 2013 06:25 pm
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Craig W
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Mike, are you now running brushless ESC's in your trains?


Herb, to my knowledge, only a handful brush-less ESC's sold for hobby industry are sensored. Those are used specifically for R/C cars I believe. I have modified one of my ESC's (the one pictured earlier)for angular position feedback of the rotor in order to aid with low speed stability, motor starting characteristics and noise suppression. This is highly atypical from what I've seen and at least in the short term, I don't see a cost effective method of producing these for our hobby, meaning the vast majority of us are stuck with brush-motors for the time being, unless you are willing to make a mechanical compromise,adding a dampening mechanism and living with a little noise.



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 Posted: Sat May 18th, 2013 09:34 pm
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mwiz64
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No... Not trains... Not yet anyway. ;)



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 Posted: Sat May 18th, 2013 10:25 pm
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Herb Kephart
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Mike

Thanks for the info!

Herb



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 Posted: Sun May 19th, 2013 01:26 am
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mwiz64
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Herb,

It's the beginning of competition season for me. My first contest is tomorrow and I've been busy in preparation. Next week, ill haul out the software and connect an ESC to the computer. Then ill have your frequency range.... I promise.



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 Posted: Sun May 19th, 2013 04:06 pm
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Herb Kephart
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Good luck throwing perfectly good airplanes away Mike!




Herb



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 Posted: Mon May 20th, 2013 02:06 am
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mwiz64
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I finished 3rd.... Not bad for a first contest. In fact, thats quite a bit better than I'd expected.

Last edited on Mon May 20th, 2013 08:02 pm by mwiz64



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 Posted: Mon May 20th, 2013 04:27 pm
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mwiz64
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Herb,

I plucked this from the manual. This is for a Castle Creations Phoenix ESC that I have.



I read elsewhere in their literature that outrunner mode is set for 8kHz.
I hope this helps.



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