What is the standard procedure to design a Synchronous Machine?
I would recommend that you validate your design yourself to begin with.
If your motor can be modeled in 2D, I would recommend that you download Finite Element Method Magnetics (https://www.femm.info/wiki/HomePage). This is a free magnetic solver that provides identical results to Ansys Maxwell (note, I have used both and I actually prefer FEMM). There are lots of useful tutorials showing off the various features. You can also link FEMM with MATLAB and utilize MATLAB's built in optimization tools, to improve your design.
Your design process might look something like this:
0. Have some requirements/ goals you want to achieve.

Start by configuring the outside dimensions of your device, such as length and outside radius.
Select Magnetic materials, conductive materials
Build initial geometry.
Analyze flux distributions, flux densities, and Inductance.
Modify geometry. Repeat step 4.
Determine number of turns, and wiring configuration.
Analyze torque/power using rated currents. Repeat step 4
Determine shaft diameter, pressfit tolerances.