Direct Current (DC) motors
DC motor Diagram
A vast range of sizes, voltages, power, speeds and current.
From microscopic nano motors using micro Watts all the way through 500 Watt small power up to multi Kilowatts industrial motors.
industrial electric motor
Good for modeling and simple robots are the range of miniature DC motors that are useful low voltage and currents that can be easily driven from micro controllers.
1.5/ 3V Miniature DC motor 0.51 W, 4300 rpm, 15.5 g-cm (Farnell)