Originally Posted by
trilerian
I'm curious if one unit is using the back emf voltage and the other is using the seen voltage by the device? They should be using the back emf voltage, and since they are most likely using that to calculate rpm, you would figure they would both use the back emf voltage as well. But it may have been an oversight in the programming. I don't know, just a guess.
I will add that I am planning on testing my Motolyser for correct Kv values this weekend. I just got my oscilloscope today so I need to work out exactly how I want to perform my test.
I'd have assumed they'd count revolutions on the sensor port for RPM, but then they'd need to use the back EMF anyway for sensorless mode. Regardless I have a tachometer and that confirms both the SkyRC and Hobbywing were reporting RPM correctly, the Hobbywing really was spinning at a higher RPM. I'm curious on why.