This is a tutorial for beginners to motor control design. The tutorial describes motor types and demonstrates signal control strategies through graphical animations. The tutorial also provides descriptions and schematics for basic motor control power semiconductor topologies.
It is supplied by Freescale semiconductors and is aimed a design engineers but is also good background for us top technicians!
http://www.freescale.com/webapp/sps/site/training_information.jsp?code=WBT_MOTORCONTROL_TUT#