EV3 Large and NXT Motors - The Differences Explained - YouTube
Lego Mindstorms EV3 Large Servo Motor 45502 USED For Robotics | eBay
NXT® motor internals
LEGO EV3 Controlling Power Functions Servo Motor 15 Positions - YouTube
NXT® motor internals
Using motors and rotary encoders
LEGO MINDSTORMS EV3 Building Set Includes 3 Interactive Servo Motors, Remote Control, Improved And Redesigned Color Sensor, Redesigned Touch Sensor, Infrared Sensor And 550+ LEGO Technic Elements