Hi Paul,Check the thread:
I may get back to doing some work on this again, but I'm recuperating from hip replacement surgery April 22. Apparently it is not necessary to use laminations for this design. Just a solid block of steel or soft iron machined into a rotor will work, or the magnetic material (not magnets) can be molded into a plastic or ceramic rotor. Since it does not rely on induction and current flow in the rotor, eddy currents and rotor conductor losses are not a factor.
It's difficult to rebuild an ACIM into a SRM. The laminated rotor is just about impossible to machine, and the stator is not designed for SRM. However, I have a small fan motor with six pole pieces that might work.
Well, t appears that the laminated rotor can be machined. I had a hard time with it, but my machine tools are not the best, and my experience is minimal. In the link you supplied, it seems that the main emphasis was on making a synchronous machine for precise firing of spark gaps for some purpose. As such, the motors probably did not need to produce much torque.
But that gives me an idea. Maybe an external mechanical commutator could be devised to discharge a capacitor into a winding that produces torque in the right direction at the right time to continue rotation. And the electromagnet pole piece could be part of an LC resonant circuit that would continue to make a magnetic field for a while as the rotor turned, since the polarity of the field does not matter for a SRM.
Do you have a link? I can only find the laminations topic!I'm still working on mine - I have the laminations for both rotor and stator, but I forgot to ask the machinist to cut the insulation paper with the steel laminations so I'm spending time cutting the paper manually.
Still need to get the endbells machined, but it's all looking promising so far...