Patent ID: 8875530

Claim:
A compressor system comprising a screw compressor comprising a suction port to receive fluid at a suction pressure, a plurality of meshing screw rotors to compress the fluid, and a discharge port to discharge the compressed fluid at a discharge pressure that is higher than the suction pressure; an electric motor to receive control signals and to drive the plurality of meshing screw rotors at a speed per the received control signals; a controller to receive status signals indicative of an operating point of the screw compressor, to determine a torque profile for the screw compressor based upon the operating point of the screw compressor, and to generate command signals that requests the electric motor be driven per the determined torque profile; and a variable frequency drive to receive the command signals and to generate the control signals that vary torque between the electric motor and the screw compressor per the determined torque profile, wherein the determined torque profile represents variance in torque between the electric motor and the screw compressor during a revolution of the electric motor.