One hour: sitting in the car, pulling at the handle, the precious minutes winding away, thinking about how they'll flay him and raise his hide up a pole, like a flag, over the plains of Gehenna.

Then the selections of phase number, winding connection, pole number and number of branches in parallel are optimized according to the SRM's symmetry and order of force wave.

The paper presents a method to design wide-ratio pole-changing motor by using single-layer winding and phase changing.