Electrical equipment designs require consideration for a variety of constraints and circumstances. Bearing this in mind, you would want to determine the value of design variables by referencing other design variables. In JMAG, you can use conditional branching to define the details of analysis conditions from the model geometry and change conditions of materials from analysis conditions.
This document explains how to restrain current value that is fed into the coils when geometry and electric resistance change.
Equation, Conditional branch, Current restraint