Normal
Although I'm not 100% how a fan does it's management of the motor I'd assume it energizes 2, 4 or 8 electromagnets that pull the fan hub.So in essence I think instead of the controller going: 1-2-3-4-1-2-3-4 it goes 4-3-2-1-4-3-2-1. This might be overly simplified, but wouldn't that be the easiest way to do it?
Although I'm not 100% how a fan does it's management of the motor I'd assume it energizes 2, 4 or 8 electromagnets that pull the fan hub.
So in essence I think instead of the controller going: 1-2-3-4-1-2-3-4 it goes 4-3-2-1-4-3-2-1. This might be overly simplified, but wouldn't that be the easiest way to do it?