I'm driving a BLDC motor (14 poles) through the profiler and connect it to the STM32 B-G431B-ESC1 inverter. I am using a sensorless control (PLL + Observer) with an auxiliary encoder mounted on top.
Motor Pilot allows me to set the mechanical speed at which the motor runs, i.e., 2142 RPM:
I plotted (again with Motor Pilot) the speed of the endoer and that calculated by the sensorless PLL. They are about the same, i.e.160:
1) However, I don't understand what scale the "y" in the graph is
2) Shouldn't the speeds in this second image be 2142 RPM ?? (as set with the Pilot)
.. maybe I am confusing electrical and mechanical speeds? and/or maybe there is an internal normalization in the code?
From this formula:
Electrical Freq. (Hz) = 250 Hz
Hello @luke514,
There is a ticket on our side to align reported speed values.
On current implementation, speed values reported on High Frequency plot are scaled by FREQUENCY_SCALE value.
Then computation is: "reported value"/FREQUENCY_SCALE and resulting value is ("Electrical Frequency"*10/"pole pair value")
