D means diameter of winding
N means number of turns but you didn't understand the problem because there is no relation between parameters or parametric setup and the question that i asked about.
I already uploaded screenshots in the first comment, please look them again. There is a problem on "Calculation Expressions". When RMxprt gives results, it share with the name "Electrical Input Power" because it is a motor not a generator. But in the parametric setup calculations, there is no "Electrical Input Power" expression. Also there are problems in some expressions, I just focused on the Power expression due to tell the problem. I use 2020 R2 version. Just create a RMxprt design and look the expressions