I used to have a permanent magnet device similar to this. It didn't need computerized stabilization because the load was actually a spinning top. The gyroscopic

I used to have a permanent magnet device similar to this. It didn't need computerized stabilization because the load was actually a spinning top. The gyroscopic forces kept the load stable. It was very difficult to get going, but once you did, it spun a very long time since it had only air friction.