BLDC Motor Back-EMF constant

Thread Starter


Joined Nov 4, 2015
Hello all,

I'm using a BLDC motor that has the attached specifications. I have a certain question regarding the Back EMF constant in the specifications. How do I convert the, I suppose kb constant with value 2.71 +-10%Vrms/kRPM into the ke constant in SI units V/radsec? Is it true that it should be equal to the torque constant in Nm/A once converted into SI Units?

Furthermore, and sorry if it is a bit off-topic, I was told that there is a relationship between kt, ke and the magnetic flux per pole in Wb. How do I get to that conclusion?

Thank you. Please ask if you think that there is some information missing.