Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: koolraj09 on December 18, 2011, 03:47:41 PM

Title: DC motor magnet problem
Post by: koolraj09 on December 18, 2011, 03:47:41 PM
Hi all.
I have this DC motor used for e-bikes [Check here (http://Check here)]
I am building a middleweight (<60Kgs) combat robot gearing down the motor from 3300 rpm to 330 rpm via chain drive. I tested it but it's magnets are coming off the casing. I am trying to find the cause of this rip off. I suspect it could be the glue strength, the sudden cyclic reversing of polarity or the rapid acceleration & deceleration . But I need your views. Also is there a way to glue back the magnets? Thanks.
Title: Re: DC motor magnet problem
Post by: Soeren on December 18, 2011, 04:54:55 PM
[Check here (http://Check here)]
Please check your links before posting (preview button, then right click the link and open in new window/tab) - or just copy-paste the raw URL, if you have trouble getting the link option to work.
Title: Re: DC motor magnet problem
Post by: koolraj09 on December 18, 2011, 11:54:45 PM
Oops...sorry.
Here is the url:
http://www.ebay.com/itm/24V-250Watt-Electric-Scooter-Motor-Unite-Brush-MY-1016-/160699546238?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item256a707a7e (http://www.ebay.com/itm/24V-250Watt-Electric-Scooter-Motor-Unite-Brush-MY-1016-/160699546238?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item256a707a7e)
Title: Re: DC motor magnet problem
Post by: Soeren on December 19, 2011, 08:16:02 AM
It seems easy enough to open, so repair should be possible if you can find a high temperature epoxy or similar, but why not contact the seller and ask for a refund first - motors are not supposed to shed their magnets with normal use - did you drop in on a hard surface?