I am looking for a stepper motor that can spin anywhere between 300-600Kg at about 30-60RPM.

I know there is a lot of math involved and its something im not good at.

I asked a friend who worked it out at 10,000Nm but i can only find a motor for 50Nm so doesnt sound right to me.

preferably the motor needs to accellarate quite quickly, but if it takes 2-3 seconds to reach 30-60RPM that should be fine.

Can anyone help me selecting a motor if it even exists.

it will be spinning a hollow sphere made from steel with the motor on one side and a bearing on the other.

Thanks for any help you can provide.