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Old Oct 07, 2012, 04:36 PM
kidovate is offline
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FPV and Robotics
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Question
Brushless Motor Loose?

Hi,

I have a brushless motor (ritewing branded), and the shaft seems to be loose in the assembly (I.E. the shaft and the part that rotates around the coils). I can actually move the rotor laterally very slightly, as well as forward and back. It's causing a LOT of vibration.

What is causing this and how can I fix it?

Thanks,
Christian
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Old Oct 07, 2012, 08:52 PM
Dr Kiwi is offline
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Sounds like sloppy bearings... and the fore and aft might be due to a missing spacer or circlip.
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Old Oct 07, 2012, 09:02 PM
Glacier Girl is offline
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Couple of things. How is the shaft secured to prevent it from pulling through?
Does it have an E clip or something that looks like a wheel collar on it?
With either it sounds like you have to much play between the retainer and the back plate of the motor for the in/out movement. Something as simple as readjusting the wheel collar, or adding a small washer between the clip and back plate to correct. Or if you know what you are doing, you can press the shaft deeper into the the bell to take up the slack.

Side to side movement, could be a bad bearing allowing lateral slop. Feel any roughness when your turn the motor? If it's a bearing, It's possible to repair, you'll have to find a matching set, press out the old and press in the new. Another one that you need to know what you're doing or you'll just make it worse, if not destroy it.

Only other thing and I've seen it on some "frugal" motors. The bell is held to the shaft with a pair of set screws. And the clearance between the shaft and hole in the bell is a little too large. Not really a lot you can do there, other then drill and tap for two more set screws on opposite sides, or try and make a bushing.
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Old Oct 08, 2012, 04:23 PM
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He had the C clip slide down the shaft , it never had the thrust collar put on to support the C clip.
All fixed now.
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Old Jul 18, 2015, 11:37 PM
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I had a little bit of play with my apprentice motor and after a crash we tried to open it up but all we ended up doing was tightening it so now there is no play, is this a good thing?
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Old Mar 29, 2016, 11:45 AM
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Quote:
Originally Posted by Hehir447 View Post
I had a little bit of play with my apprentice motor and after a crash we tried to open it up but all we ended up doing was tightening it so now there is no play, is this a good thing?
Dear Hehir447. I have a brushless motor that's a little loose and I was wondering if you could talk me through the process of tightening it. Untill now I was unable to tighten it enough. Looking forward to your reply.
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Old Mar 29, 2016, 07:45 PM
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Quote:
Originally Posted by sjorsw View Post
Dear Hehir447. I have a brushless motor that's a little loose and I was wondering if you could talk me through the process of tightening it. Untill now I was unable to tighten it enough. Looking forward to your reply.
It is easy to remove the Circlip and pull the magnet housing off, in most cases it can be done by hand:

Outrunner Disassembly and Stripping - Gimbal Motor Rewind - http://www.rcgroups.com/forums/showthread.php?t=1823636

With the housing off you can check the bearings for looseness or roughness and also make sure that the shaft is straight and not loose in the magnet housing.

Jack
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Old May 06, 2016, 07:17 PM
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Quote:
Originally Posted by sjorsw View Post
Dear Hehir447. I have a brushless motor that's a little loose and I was wondering if you could talk me through the process of tightening it. Untill now I was unable to tighten it enough. Looking forward to your reply.
Sorry sjorsw, I haven't checked these threads for a while.. have you sorted out your motor?
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