How can I define the coil with current to active my motor

Dear all

I cannot find a good way to define the coils in my motor. I use rmm to do my simulation. Have any try to define your coils with variables? Under the condition of infinitite time, how can I use variable to make my current in a certain time? Or if you had met this kind of problem, hope you can share your idea with me.

Regards

Joey