Convert Ke Measured to "Actual" Ke ????

I have a BLDC (650W from Golden Motors) that I just spun up with a power drill. I measure the shaft RPM and the phase voltages. Now that I have this data I'm struck with the thought "how does measured Ke relate to Ke used in motor simulations"?

My emperical data is:

Phase 1 - 26.4 V/Krpm
Pahse 2 - 26.0 V/Krpm
Pahse 3 - 26.4 V/Krpm

I'm a bit concrened as I expected a Ke in the high 40s because the no load speed at 48V is 1172 rpms. Hopefully it's just a math problem.

How were you measuring voltage?

TIberius (Nick) has a thread on measuring Kv (or Ke if you really must) that goes pretty deep on this very subject.

I measure each phase circuit individually with a volt meter measuring AC voltage.

Read this thread. It will answer all your Kv related questions, and why normal measurements are tough.

http://endless-sphere.com/forums/viewtopic.php?f=30&t=17849&p=282324&hilit=tiberius+kv#p282324


Also, while reading that, appreciate what a badass awesome guy Tiberius is. I wish he would post more often, I always enjoy his insights and projects.

Ya know, after I read the info i realized that i read all that before and somehow forgot...................it sucks getting old.....

Thanks for the link.