I have an induction motor that is rated for 50/60 Hz, with full-load amperages of 1.85A / 2A respectively. It is not rated for any other operating frequency.
If I connect it to a VFD, will it be safe to run at say 40 Hz, assuming a linear relationship between the frequency and full-load amperages?
i.e.: for full-load amperages (assuming average RMS value between three phases), if 60 Hz = 2A, and if 50 Hz = 1.85A, so perhaps 40 Hz = 1.70A?