Page 75 - Robots Androids and Animatrons : 12 Incredible Projects You Can Build

DC motors
DC hobby motors can be applied to movement and locomotion
(see Fig. 4.13). Specifications of most DC motors show high revo-
lutions per minute (rpm) and low torque. Robotics need low rpm
and high torque. Gearboxes can be attached to motors to increase
their torque while reducing the rpm (see Fig. 4.14). The gearbox
usually specifies a ratio that describes the rpm in to the rpm out. For
instance, a DC motor with an rpm of 8000 is connected to a 1000:1
gearbox. What is the output rpm? 8000 rpm/1000 8 rpm. The

54
4.13 DC motor

4.14 DC motor with gearbox

Team LRN
Chapter four