Over Volting Motors

[bigisland]

I have been looking at endless sphere for LEV info but now have a question about DC motors for another application that I thought I probably could get some help with here. I am looking to run a sprayer pump motor that is a 12v motor, I am looking into batteries for this and am wondering If I can use a slightly higher voltage like a 4S lipo 14.8 V. Can some one explain how voltage effects a motor and how much you can go over their rating.

THANKS !

 

[rhitee05]

For the most part a motor's rating is really all about heat, which means current. Increased voltage will cause increased current and thus increased heat. The motor only really cares about the voltage itself if the voltage gets too high for the wire insulation, but that's hundreds of volts. I don't think you'll have any problems with a small bump in voltage like that.

 

[Mattyhawk]

Another issue to consider is if the bearings can handle it, but again, with a small bump up in voltage, you shouldn't have an problem.

 

[rhitee05]

Another issue to consider is if the bearings can handle it, but again, with a small bump up in voltage, you shouldn't have an problem.

At that point the motor would also be in serious danger of self-destruction through centripetal force, I suspect. A bad place to go, either way.

 

[parabellum]

I have Seedoscooter (for diving), working usually uninterrupted 1hour on lead acid 12v 12A battery. I modified it to 4s 4p 20a LiPo, it lasted 15min and got off. After opening, I found bad smell and unsoldered wires. Motor is still working but now I use 12 Lead battery again (in the encapsulated space is no possibility to provide necessary cooling). If you go to 4s Lipo, you are raising potential power consumption of the motor to 152%.
1)In your case I would try to improve cooling of the motor.
2)Brushed motors do not like over volting so much as brushless.