Hi there, part of my coursework needs me to work out the back emf constant kω and I'm struggling to reach the needed answer. The motor specification can be found at https://www.mfacomodrills.com/pdfs/919D series.pdf. The given emf constant is 7.26x10^-3. Any tips or pointers would be welcome. Many thanks!

PDF Added

 

... just looking at the reference link:
https://en.m.wikipedia.org/wiki/Motor_constants
where the constant Kv is described, it looks like the basic problem is to obtain an accurate voltage measurement directly at the stator coils, as the motor is operated at the maximum no-load RPM. ... A scope measurement might be appropriate here.
... maybe include the units that are required for your measurement.

 

hi Edward,
Welcome to AAC.
Added the PDF to your post.
E