Originally Posted by Mariss Freimani Chris,
You can do it the fun way...
Mariss |
Thanks for this great method. Just to be certain that I'm understanding you, the back emf will then be the voltage generated at each respective rpm. Since the motors ramp down to a stop it seems that the back emf will be more a characteristic of the ramping rpm than the main feed rpm. Is this correct or is the ramp time interval generally too small to be significant? Also regarding Gerry's comments above does the mass of the load being moved come into play? Since a more massive load draws more current it would seem that the back emf would be higher than for the unloaded motors in the drill press measurement? If so is there a way to include this aspect in your experimental method?
Chris