I think I've mostly done this part, but I need external verification, as my calculations are based on crude assumptions of field lines. I have to be sure about this part before proceeding to the build.
The coil will be sandwiched between two axially magnetized magnets, and moving along with them, in a fixed position, on a shaft. When power flows thru it, Lorentz forces are going to act in various directions.
The coil has to nullify - or almost achieve that - Lorentz forces that act on it , especially those that can either hinder or accelerate rotation.
However, as opposed to a regular motor or generator, where coils are either on stator and rotor, in this case the whole assembly is a rotor, with no relative motion between magnets and coil, meaning that the composition of Lorentz forces is going to stay the same instead of rotating on a 360 degree pattern.
My model presumes two half toroids with rectangular turns. I modelled, in a crude fashion, current interaction with the field lines from both magnets, as well as field lines resulting as interaction of the magnets with induced field in the half toroids.
I have not covered any interaction with the coil core, and I do not know what a magnetized iron/steel core can have over the field lines.
What I need from you is to check on my work, see if my results are valid. I know there are CAD packages that can draw Lorentz forces, but I don't have access to anything like that. Still, I have to be sure about what I'm having before I actually put the project up for building. My application can now export coil mockups to OBJ format for easy import in a dedicated CAD application.
... Show more