I have constructed an inertial dynamometer for 540 (36mm diameter) size electric motors and it seems to mostly function but I am getting an unusual "bump" in my rpm around 5000 rpm. I have tried different ways of controlling the servo signal to my motor speed control and there does not seem to be an…

RPM anomaly in Dynamometer

bluejets April 17, 2019, 2:09am 2

What does the bottom line of the graph represent?

Revs portion as such appear to increase ok.