Maker Pro
Maker Pro

Series wound motor, what controls the top RPM?

supak111

★ƃuᴉɯǝɥɔs sʎɐʍlɐ★
Apr 29, 2012
341
Joined
Apr 29, 2012
Messages
341
What controls the max RPM of a series wound electric motor?

My understanding is if the motor has no load, RPM will just keep accelerating until the motor flies apart, is this correct?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Torque will decrease with increasing RPM, but it will never reach zero.

If there were no friction, the motor would keep increasing speed (but at a decreasing rate) forever.

But there is friction. (and other losses)
 

supak111

★ƃuᴉɯǝɥɔs sʎɐʍlɐ★
Apr 29, 2012
341
Joined
Apr 29, 2012
Messages
341
Thank you Steve, just what I though.
 

duke37

Jan 9, 2011
5,364
Joined
Jan 9, 2011
Messages
5,364
I have often wondered about this question.
Most of the series wound motors are run on AC so there is a current limit due to the inductance of the windings. I have thought about trying an electric drill running on rectified AC and see if the speed goes up.
 

supak111

★ƃuᴉɯǝɥɔs sʎɐʍlɐ★
Apr 29, 2012
341
Joined
Apr 29, 2012
Messages
341
Yea I wouldn't mind spinning one to destruction, but hook it up to sometime to see the rpms it achieves

PS never though to look before but there are many videos on this on youtube actually, i guess i'm not the only one to find it interesting lol
 
Last edited:
Top