I found a pair of fans.
The first one is 24 volt, about 8 cm square
See the attached current waveform. The average current consumption is 60.5 mA, but it has peaks reaching 120 mA. But it has narrow peaks of -76 mA.
The second one is 12 volt, about 4 cm square, and rotating faster.
You can see that the average current is 76.3 mA, but it has a maximum of 98 mA and peaks of -26 mA.
In both instances, if I slowed down the fan with my finger, the period would increase. Meaning as I had mentioned previously, that the current changes with the rotation.
![Getting 7v from 5v and 12v power supplies](https://www.eevblog.com/forum/index.php?action=dlattach;topic=237300.0;attach=968948;image)