I'm building a small fume extractor for soldering.
I have a leftover desktop fan I'll use. I was unsure about the voltage needed, so I hooked it up to my power supply and stepped up the voltage until it started spinning (around 6V but I think most of these fans are 9-12V nominal if I recall). It's drawing 30mA at 9V right now.
If I place my finger on it to arrest the movement the current draw drops to 0. When I release it the fan rotates quickly to some location which I assume is the armature aligning with the magnet. Now, though, it sits stationary for about 2 seconds before resuming spinning.
What's happening in those 2 seconds before it resumes spinning?