Gas turbine engine equipped with a control system for management of rotor modes using an electric machine

A method of operating a turbomachine, the method comprising:

• receiving data indicating an operating state of a rotating component of the turbomachine, the turbomachine including an electric machine having a stator assembly and a rotor assembly, the rotor assembly being rotatable and operatively coupled with the rotating component;
• moving a position of at least one of the stator assembly and the rotor assembly based at least in part on the operating state of the rotating component so that an air gap defined between the rotor assembly and the stator assembly is changed and a stiffness of the electric machine is changed;
• and
• determining whether a parameter value received as part of the data has passed a threshold, and wherein when the parameter value has passed the threshold, adjusting the position of the at least one of the stator assembly and the rotor assembly to control a vibration response of the rotating component to which the electric machine is coupled and to change the stiffness of the electric machine.

A non-transitory computer readable medium comprising computer-executable instructions, which, when executed by one or more processors of a controller, cause the one or more processors to:

• receive data indicating an operating state of a rotating component of a turbomachine, the turbomachine including an electric machine having a stator assembly and a rotor assembly, the rotor assembly being rotatable and operatively coupled with the rotating component;
• generate a control command for an actuator to adjust a position of at least one of the stator assembly and the rotor assembly based at least in part on the operating state of the rotating component;
• cause the actuator to adjust the position of the at least one of the stator assembly and the rotor assembly based at least in part on the control command;
• and
• determine whether a parameter value received as part of the data has passed a threshold, and wherein when the parameter value has passed the threshold, cause the actuator to adjust the position of the at least one of the stator assembly and the rotor assembly to control a vibration response of the rotating component to which the electric machine is coupled and to change a stiffness of the electric machine.