Large DC Motor with Inc. Optical Encoder.
6 to 24 VDC standard operation.
05 Jan 2010
Model       DCMTR-100
Motor diameter                  1.5 inch 
Motor length, overall          3.4 inches
Output shaft diameter        0.125 inches
Output shaft length              0.4 inches
Encoder diameter              1.5 inches

       $40.00 ea.
Indicate number of encoder holes desired  20 or 42 if not specified either one will be shipped as may be in stock. 
These DC motors uses 2 phase (quadrature) incremental encoders to detect the speed of the motor and the distance it has travelled. 

These motors are designed to run at 6 to 24 volts DC and they draw less than 3 amps w/locked rotor.   (This is normally referred to as the stall current and is usually  the maximum current draw for the motor).  Motors are rated at 12 VDC but can be kicked up to 24 VDC for short periods to get a higher power level if the amplifier used to run the motor can provide the needed power.

Controller and Amplifiers for these motors should be able to provide a continuous current of 3 amps and extremely short bursts of 6 amps.   Popular, amplifiers and controllers based on the National Semiconductor LMD18200 series chips will do this.
A large and powerful DC motor w/encoder
LEDs annunciate power and each encoder signal.
EncoderGeek / EncoderGeek
Connector Kit      CK-1

Provides two four pin encoder connector with pins and housings and a male/female power connector to simplify the connection of the motor to the controller and the motor power supply.
Price                     $5.00 ea.
$40.00 ea
Specify 20 or 42 slots in encoder
Shown with coarse encoder