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01-19-2014, 09:20 AM | #1 |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Rebuilding brushless motor ?
So when does a senored brushless motor need to be rebuilt ? Also how can you tell if the magnets are gone ? I have a used tekin 17.5 2 pole and seems to have very little resistance when hand spun. |
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01-19-2014, 06:42 PM | #2 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Rebuilding brushless motor ?
Testing the KV is one method to see if the rotor is damaged, using a gauss meter is the other. The motors spin pretty easy by hand because of the small rotor, so you won't have a good indication from that sort of test. Have a tach? You could also open it up and see if there is any evident heat damage. If it gets hot enough to demag the rotor there will typically be damage to the plastic inside too. |
01-19-2014, 06:50 PM | #3 | |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Re: Rebuilding brushless motor ? Quote:
Guess I could also mail it in and have you guys look at. | |
01-19-2014, 07:08 PM | #4 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Rebuilding brushless motor ?
Could do that. We have replacement rotors here too.
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01-22-2014, 08:56 PM | #5 |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Re: Rebuilding brushless motor ? |
01-22-2014, 11:24 PM | #6 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Rebuilding brushless motor ?
Usually once a rotor loses its pull the whole thing runs like a dog and always on the hot side. Also, a burnt smell is rarely a good thing.
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01-23-2014, 06:30 AM | #7 |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Re: Rebuilding brushless motor ? I didn't know that it was burnt. I bought this motor used and never messed with it till now. Sounds like it be good time to check into Holmes new motor.
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01-23-2014, 07:50 AM | #8 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Rebuilding brushless motor ?
I was just sayin. A month or so ago I got a box full of used motors. All of them smelled burnt, all of them were dead or close to dying. I got them really cheap, but still, there were some high $ race motors in there. Bummer. |
01-24-2014, 12:04 PM | #9 |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Re: Rebuilding brushless motor ? |
01-24-2014, 12:57 PM | #10 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: Rebuilding brushless motor ?
You probably pick up a new rotor and rewind it. I'm going to mix-n-match my box of junk and hopefull end up with a couple that are usable.
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01-24-2014, 01:21 PM | #11 | |
Moderator Rule Breaker Join Date: Feb 2004 Location: Austin, Tx
Posts: 5,970
| Re: Rebuilding brushless motor ? Quote:
I like to try a roc 412 or one john's new motors Harley posted up. | |
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