Patent ID: 8172740

Claim:
A method, comprising: providing a centrifuge system, wherein the centrifuge system comprises: a bowl, a bowl motor system that is adapted to rotate the bowl so as to apply a G-force thereto, a bowl variable frequency drive that is adapted to drive the bowl motor, a conveyor that is adapted to be rotated within the bowl, a conveyor motor that is adapted to rotate the conveyor, a conveyor variable frequency drive that is adapted to drive the conveyor motor, a pump that is adapted to pump material to be centrifuged in the bowl, a pump motor that is adapted to drive the pump, a pump variable frequency drive that is adapted to drive the pump motor, and a control system that is adapted to control the bowl variable frequency drive, the conveyor variable frequency drive, and the pump variable frequency drive, wherein the control system comprises a computer apparatus that is adapted to control the centrifuge system in a G-force differential control mode, and wherein the computer apparatus is programmed with a pre-set maximum G-force to be applied to the bowl; and controlling the centrifuge system in said G-force differential control mode by controlling the G-force on the bowl as the bowl is rotated by the bowl motor system so that the G-force on the bowl does not exceed the pre-set maximum G-force, wherein the G-force is controlled by one of adjusting the G-force on the bowl and adjusting the speed of the bowl.