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.

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.

Re: Rebuilding brushless motor ?
 

Wish I had tach. I was told when I bought, it was gone through.

Guess I could also mail it in and have you guys look at.

Re: Rebuilding brushless motor ?
 

Could do that. We have replacement rotors here too.

Re: Rebuilding brushless motor ?
 

I took part the motor, The rotor look fine. But can smells burnt. The pcm board looks fine.

It was hard to get clear pics.



http://i850.photobucket.com/albums/a...psjh36dj97.jpg

http://i850.photobucket.com/albums/a...psnrr1nop1.jpg

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.

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.

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.

Re: Rebuilding brushless motor ?
 

I got this one on the cheap.

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.

Re: Rebuilding brushless motor ?
 

Rotor looked fine there is no bluing or deep scratches. The pcm board look good too. The can just smell's burnt.

I like to try a roc 412 or one john's new motors Harley posted up.