spinning particles around an axis for planet rings

I have a torus set up with particles to fill the volume of the torus. I want to have the particles spin along in a ring as they would with a planet. I will eventually child the particles to look like rocks. My problem is i set the torus to rotate and animated it that worked fine but the particles just stay in place and don’t move. I can’t figure out how to get the particles to rotate like the torus and not change from the desired path. Any help would be appreciated.

Maybe you can adapt this blood cell animation?


ras_blood_cell.blend (420 KB)