If you say auto spin of rotor I assume you mean you have airball roulette, right?
If so it depends on the model of the airball machine. What I would be very weary of would be the airball machines (latest mmodels) where the wheel speed changes in mid spin (apparently)
If not, and it’s the older models the usually have about 3 different wheel speeds if I recall correctly. Haven’t played those in a long time as theyu have been removed from our casinos