Quote Originally Posted by gas_liosia View Post
I don't think that he can do anything by changing the parameters. The basic parameters should be the same as the manufacturer of the spindle says on the label/manual. Beyond the values for the rated voltage, current, efficiency and maximum frequency I don't think all the other parameters have to do with the performance of the spindle or make it run smoother.
As you obvious do know, a vector drive which his new spindle should have will even run much smoother and have a better performance than the VFD drive he is using

You are right that the basic Parameters don't change, for a given motor being used, but there are other Parameters that can make a big difference even on a regular VFD Drive