Patent ID: 11933301
Assignee: TRANE INTERNATIONAL INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 9:
10. A method of operating a system including a plurality of screw compressors, including:
operating at least one screw compressor of the plurality of screw compressors by:
operating a motor of the at least one screw compressor at a selected rotational speed when the screw compressor is operated at a full load capacity,
wherein:
each of the plurality of screw compressors has a rated capacity,
at the selected rotational speed, at least one rotor of the at least one screw compressor rotates at a tip velocity, the tip velocity independent of the rated capacity of the screw compressor,
the selected rotational speed is greater than a synchronous motor speed for the rated capacity,
the motor is a permanent magnet motor, and
operating the permanent magnet motor includes receiving a command signal at a variable speed drive from a controller, and generating, at the variable speed drive, a control signal that drives the permanent magnet motor to operate at the selected rotational speed.