Strange clicking sound in hub motor

[Voltstein]

Hi,

I just put my shop-repaired ezee wheel motor back into the hub and mounted it on the bike. It is now making a strange noise I never heard before. When the wheel is powered it makes a clicking sound, which increases as the speed increases. When the wheel is hand rotated forward it doesn't make the sound, however when it is rotated backwards it does make it. I uploaded a video to YouTube so you can hear it for yourself. Any ideas what this can be due to?

http://www.youtube.com/watch?v=rORFAuUZQao

--Brian

 

[knoxie]

it will most likely be the one way bearing or possibly the rotor as it only makes a sound when the motor drives.

 

[Erikjan]

when my motor sound like this a magnet was came of inside.

 

[d8veh]

What repair did they do? How old is the motor?
That noise doesn't sound like it should be ignored. I would say that you have to take it back to the repairer if you paid for the last repair.

 

[knoxie]

Yes I am thinking either rotor magnet damage or a piece of something between the rotor and the stator, should be fairly obvious by splitting the drive but understand thats not for everyone to go ahead and do, maybe contact the supplier.

 

[Voltstein]

One of the hall sensors went bad so I pulled the motor and sent it to Grin, where I bought the wheel just a couple of months ago. Grin replaced the hall board and sent ot back to me. I didn't notice anything loose or wrong when I reassembled, but the sound started right away.

Edit: I just pulled the motor out of the hub again. When I rotate the gears I can hear the rubbing sound and it sounds like it is coming from between the stator and the windings. I don't have a gear puller so can't pull the stator cover off at this time to get a better look.

 

[Voltstein]

Problem solved. Pulled the motor and after careful examination noticed small amounts of clear epoxy on the surface facings of some of the magnets. These must have dripped onto the faces of the magnet when the shop replaced the Hall board. When the motor rotated those epoxy drippings rubbed against the outer metal edges of the the windings, causing the odd sound. I carefully scraped the epoxy drippings off, blew the motor clean, and the rubbing went away.

 

[Kingfish]

Problem solved. Pulled the motor and after careful examination noticed small amounts of clear epoxy on the surface facings of some of the magnets. These must have dripped onto the faces of the magnet when the shop replaced the Hall board. When the motor rotated those epoxy drippings rubbed against the outer metal edges of the the windings, causing the odd sound. I carefully scraped the epoxy drippings off, blew the motor clean, and the rubbing went away.

Good job there you in Seattle :wink:

I think that makes four of us in the realm now.
Cheers, KF