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mCP X Brushless Mods Blade Micro CPx Brushless Mods and Conversions


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Old 04-11-2013, 03:41 PM   #1 (permalink)
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Default Diagnosing an Issue

I converted my MCPX v2 to brushless thanks to the work of NCcraig using a 7amp esc and AEO M5 motor. I have been flying with 300mah Nanotech and it has been great. The other day I landed and plugged in a new battery when I initialized the ESC the motor started really jerky like it didn't want to spin and the ESC got hot so I unplugged it. I let everything cool off and tried it again but got the same result. The motor spins but really jerky and the ESC gets hot.

I am just not sure if the issue is with the ESC or the motor and hate to throw money at it. Is there a way to check the ESC short of buying a new motor and testing it out? When spinning it by hand the motor seems to spin fine and I don't see any broken wires.
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Old 04-11-2013, 03:45 PM   #2 (permalink)
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Sounds like a short to me. The motor should not move until you tell it to with the sticks. Does it beep? Because it sounds like instead of sending a signal to the motor to just beep it is telling it to move when you plug in the battery.

Edit..... Read it again and you are initializing the esc. Sounds like a lose motor lead to me now.
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Old 04-11-2013, 03:53 PM   #3 (permalink)
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Check for debris in your motor too. I had my C05 bird do this once and it was a servo screw lodged in the motor Don't ask me how it got there.

But, it acted in exactly the same manner
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Old 04-11-2013, 04:35 PM   #4 (permalink)
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Quote:
Originally Posted by litehawkdown View Post
Sounds like a short to me. The motor should not move until you tell it to with the sticks. Does it beep? Because it sounds like instead of sending a signal to the motor to just beep it is telling it to move when you plug in the battery.

Edit..... Read it again and you are initializing the esc. Sounds like a lose motor lead to me now.
Yes, everything is initializing as it should and the motor is only trying to move when I ask it to

Quote:
Originally Posted by koi-fish View Post
Check for debris in your motor too. I had my C05 bird do this once and it was a servo screw lodged in the motor Don't ask me how it got there.

But, it acted in exactly the same manner
I have pulled the c-clip and had the motor in 2 pieces and can't find anything out of the ordinary. Everything seems to spin without resistance except when power is supplied it is like the motor is under a load.
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Old 04-11-2013, 06:46 PM   #5 (permalink)
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Yes, everything is initializing as it should and the motor is only trying to move when I ask it to



I have pulled the c-clip and had the motor in 2 pieces and can't find anything out of the ordinary. Everything seems to spin without resistance except when power is supplied it is like the motor is under a load.
Did you happen to see the edit? Might want to check for a bad motor connection.
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Old 04-11-2013, 08:00 PM   #6 (permalink)
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Quote:
Originally Posted by koi-fish View Post
Check for debris in your motor too. I had my C05 bird do this once and it was a servo screw lodged in the motor Don't ask me how it got there.

But, it acted in exactly the same manner
Yeah, either a clean workbench, or bag the motor when doing bench work.
Never had it happen, but am aware of the possibilities. A 700E motor can pick up all sorts of trash.

if the esc is getting hot, its probably because the motor is not spooling up, but a shorted winding can do it too. Since you have ruled out mechanical binding, a shorted winding, a bad connection, or a cold solder joint can do this.
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Old 04-12-2013, 01:30 PM   #7 (permalink)
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time to pull out the multimeter and do a continuity check of the phases/windings.
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Old 04-12-2013, 04:47 PM   #8 (permalink)
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time to pull out the multimeter and do a continuity check of the phases/windings.
Yeah your going to have to provide me a link or something for that one.


Seem like everyone is saying a motor issue vs an ESC issue so I placed an order for an AEO CO5M hopefully that takes care of it.
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Old 04-12-2013, 06:45 PM   #9 (permalink)
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Not real hard actually. Can you use a DVM (Digital Voltage Meter)? if you know how to test for resistance then I can walk you through this.

1. Put your meter into its mode to measure resistance (Ohms).
2. Disconnect the motor from the ESC
3. Measure the resistance between each lead and the metal can or top plate of the motor, this should measure infinite resistance, if not then replace the motor
4. Measure the resistance between each wire (in pairs), the resistance should be the same between each, if one set shows a higher reading this means you have an open or partial open. replace the motor

If you have made it through the list and all checks OK then the ESC would be suspect as one of the FET's is probably bad for some reason.

You can get a cheap meter from Radio Shack if you do not have one.you should get one if you do not have one.
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Old 04-12-2013, 07:14 PM   #10 (permalink)
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Well based on those readings the motor is fine so it might be the esc. Guess I will wait until the new motor gets here since it is ordered to see if I get the same result before proceeding with changing the esc.
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Old 04-13-2013, 04:33 PM   #11 (permalink)
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The jerky start-up or bouncing but no proper rotation is usually one of the phases not working, this can be the motor or the ESC, if the resistance check proved the motor to be OK then one of the FET banks of the ESC is not firing properly or one of the FET's in a bank is shorted or open. Shorted will cause heating of the ESC, open condition will cause the jerky movement with no or minimal heating.

WHen you get the new motor connect it prior to installing it and see how the ESC behaves. My bet is the ESC is the culprit in this case.

Good luck with your troubleshooting
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Old 04-16-2013, 06:23 PM   #12 (permalink)
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Looks like your right the new motor gave the same results guess its time for a new ESC.
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