Rather than being a purely theoretical discussion we will follow my practical experience of buying, and controlling, a stepper motor. To make this more of a ‘closed loop’ tutorial I will try to explain how my findings would change my next purchase of a stepper motor and where I, now, think that they are better/least suited. Of course your experience or requirement may be very different from mine so ‘viva la difference’ – my only objective is to try and help understanding!! However, some of the discussion may help you to select a stepper motor that is fit-for-purpose.