The system pictured above, using dual power supplies, or 3 phase bridges, has been built and installed. It appears so far to be a good solution for coils. The current draw is about 10 amps max, and the rotor will rotate at about 6 amps. The speed is still very slow, as the rotor is jumping in the magnetic fields, and the guide wheels are causing a lot of friction. I had a better arrangement of stabilizing magnets previously and will return to it. If I can get the rotor to go into fully levitating mode the friction will be zero, the speed will increase and the current draw will drop. It is using about 200 watts at present to move the 30kg rotor.
Another reason this coil setup is appealing is that more coils can be added if required. For instance, if I need to go to a 6 coil set system for more power then I will build 2 more bridges, and then each coil set can be supplied by a separate MOSFET bridge for each of the 4 individual coils and the current draw will simply double. This would also allow magnets and coil sets to become longer in 80mm increments if required. Just another bridge for each added coil pair.
See also another possible simplified drive system using Low Side Mosfets