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

Claim 0:
1. A method of operating a screw compressor, the screw compressor having a rated capacity, the method comprising:
operating a motor of the screw compressor at a selected rotational speed when the screw compressor is at a full load capacity,
wherein:
at the selected rotational speed, at least one rotor of the screw compressor rotates at a tip velocity, the tip velocity being 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.