Let's Make Robots!

How to choose a DC motor for your robot

The question "Which motors do I need?" is a constantly recurring question. I've seen simple answers like, "You need a gear motor" and "Go for a high gear ratio" but these are inadequate for calculations. Given the usual voltages, motor drivers, wheels, and speeds used you can be somewhat general about things but trial and error can be inconvenient and expensive. I thought I'd post this attached .pdf that seems to be a lesson plan from Gear Educational Systems that covers motor selection. Although it gets knee-deep in the details it has all the formulas required to make an informed decision before you buy.

Don't be phased by the immediate math; skip to page seven for the step-by-step procedure.

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Lesson3_Mathematical20Models20of20Motors.pdf685.63 KB