US 12,326,096 B2
Core turning system
Bradley C. Schafer, Ellington, CT (US); Brian V. Winebrenner, Vernon, CT (US); Jason B. Solomonides, Cromwell, CT (US); Marc J. Muldoon, Marlborough, CT (US); and John P. Virtue, Jr., Middletown, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on May 10, 2024, as Appl. No. 18/660,309.
Application 18/660,309 is a continuation of application No. 18/299,423, filed on Apr. 12, 2023, granted, now 12,018,578.
Prior Publication US 2024/0344466 A1, Oct. 17, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F01D 25/36 (2006.01); F01D 21/04 (2006.01)
CPC F01D 25/36 (2013.01) [F01D 21/04 (2013.01); F05D 2270/114 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A bowed rotor prevention system comprises:
a gas turbine engine including a rotor that is rotatably coupled to a drive shaft;
an electric motor rotatably coupled to a motor shaft, the motor shaft mechanically coupled to the drive shaft so as to rotate therewith; and
core turning controller in signal communication with the electric motor, the core turning controller configured to determine whether a rotor bow is present in the rotor based on an operating time of the gas turbine engine, to determine a motoring time based on the operating time, and to invoke an anti-rotor bowing mode configured to control the electric motor to rotate the rotor according to the motor time,
wherein in response to invoking the anti-rotor bowing mode, the core turning controller is configured to perform one of a first anti-bowing technique to prevent the rotor bow from forming in the rotor, or a second anti-bowing technique that removes the rotor bow present in the rotor, and
wherein the core turning controller performs the second anti-bowing technique in response to a deactivation of the core turning motor before the motoring time expires.