Hi,
I am not sure what you want to know. The output would ramp up from some low value while the frequency stayed constant, until the point where the voltage got up to the normal voltage/frequency relationship and then it could either change both or just stay there.
So lets say your motor works at 20v and 20Hz. You might start at 20Hz and start the output voltage at 5v and ramp the output voltage up little by little. You should not have to change the input DC voltage.
I am not sure what you want to know. The output would ramp up from some low value while the frequency stayed constant, until the point where the voltage got up to the normal voltage/frequency relationship and then it could either change both or just stay there.
So lets say your motor works at 20v and 20Hz. You might start at 20Hz and start the output voltage at 5v and ramp the output voltage up little by little. You should not have to change the input DC voltage.