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Home✈️Aircraft🚁HelicopterAerial Photography and Video › Actro / powerjazz problems- help needed
06-16-2009 08:28 AM  11 years ago
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shroomer

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Chiang Mai Thailand

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Actro / powerjazz problems- help needed
I have just finished building a maxi joker with actro and powerjazz ESC fitted, and was in the process of testing it. 2S/2P 12 cell A123 batteries fitted- approx 42V @4600mah. 13 tooth main pinion at 85% throttle curve.
I was in the process of spooling up the maxi joker to fly yesterday when it just stopped. The person who was with me thought they heard a popping noise. I tried a few times connecting the battery again, but was not getting the series of beeps when you reconnect it.
On getting it home discovered that 5 of the A123s in one pack would not charge and only show 3.4V, not 3.7V. I also plug the programmer into the powerjazz, but am not getting any readings (LED's) showing.
Also attached picture of top of actro. I can't say I looked at it too closely before, but it looks to have fused between two windings??

I did hover the heli on a previous occasion for about 10 minutes or so with a 17 tooth main pinion, but could only set the throttle curve to about 55% for 1400 headspeed, but thought this too low and changed the pinion to bring up the throttle setting.

Suggestions on anything I can do to prove where the fault is much appreciated. It seems to me that the motor shorted taking out the ESC and some batteries, but that is just guesswork on my part as am not so familiar with this.
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06-16-2009 08:29 AM  11 years ago
shroomer

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photo attached
photo attached
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06-16-2009 09:21 AM  11 years ago
shroomer

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Photo- try again!

[title] My Gallery Photos
[img] /fastphoto/67027/actro.jpg [desc]
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06-16-2009 10:22 AM  11 years ago
fionn

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Ireland

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The windings look fine to me but it's hard to say without the bell off. You need to measure the resistance between each of the motor leads to check for a short.
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06-17-2009 02:08 AM  11 years ago
shroomer

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Chiang Mai Thailand

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I checked between the windings- red/ blue / black, about 1 ohm between them all, P=V squared/ R, so 1600 W at 40 V or therabouts, but am not sure if the resistance should be the same between all the cores- does anyone know? Is there a way of checking that the motor works without the powerjazz between battery and motor? Also is there any way of resetting the powerjazz to default in case the problem lies in there somewhere?
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06-17-2009 02:20 AM  11 years ago
shroomer

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Does anyone have contact details for actro? There are none in the manual or on their website I could see.
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06-17-2009 03:00 AM  11 years ago
nooobs

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web

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...
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06-17-2009 03:23 AM  11 years ago
iflybyu77

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Fort Wayne, IN

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Just an FYI - there are is a thread on here about Actro's that have bad solder joints between the windings and the wires that go to the ESC. I've seen one apart that all three solder joints were bad, and one became disconnected.
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06-17-2009 04:40 AM  11 years ago
shroomer

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Chiang Mai Thailand

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Thanks for that. I tried to take the top off the motor - but it would not come easily, and I didn't want to force things. Is it just a matter of removing the screw at the top and prising the housing off?
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06-17-2009 05:39 AM  11 years ago
gjestico

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Vancouver, B.C.

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You want to take the snap ring off the shaft (at the pinion end) and then slide the whole shaft/bell out. The shaft is bonded (locitited?) into the magnet bell.
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06-17-2009 11:30 AM  11 years ago
shroomer

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Chiang Mai Thailand

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I managed to get the shaft / bell off. How do I get the base plate off the magnet/ windings to check the wiring is attached ok?
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