DC motor torque and power
A copy of my notes on DC motor torque and power can be downloaded at the link:
http://synthetica.eng.uci.edu/mechanicaldesign101/McCarthyNotes-1.pdf
Motor Torque and Power
DC motor basics
The basic principles of DC motors are presented by Joe Wolfe of the University of New South Wales (Sydney, Australia) at the link:
http://www.animations.physics.unsw.edu.au/jw/electricmotors.html
Phyclips from UNSW
Northwestern University (Chicago, Illinois) presents the basics of a DC motor in the Wiki page:
http://hades.mech.northwestern.edu/index.php/Brushed_DC_Motor_Theory
Northwestern University Wiki page