dave-in-nj:
every motor has a maximum voltage rating. it is a disservice to dismiss a part of the calculations without describing why.
I make no apology for keeping my material simple. And I did say "for all practical purposes" - meaning for all practical purposes for the people for whom the note is written.
The important point is that when the datasheet says 2.7v it does not mean that is the maximum you can use, nor even that it is close to ideal.
If you can give me one or two sentences that will enhance the text without confusing newcomers I will certainly consider including them. That is the purpose of asking for comments.
...R