Electromagnetic inducer for gas turbine rotating turbomachinery

A method of operating a gas turbine engine, wherein the gas turbine engine comprises a fan section, a compressor section, a combustor section, and a turbine section, wherein at least a portion of the fan section, the compressor section, and the turbine section are operably connected by a shaft, the method comprising:

• rotating a plurality of first electric machine elements on a rotating component, wherein the plurality of first electric machine elements are arranged at tips of respective airfoils of the rotating component, wherein each first electric machine element comprises a magnetic material;
• inducing a current within a second electric machine element, the second electric machine element configured as a coil arranged within a circumferential slot in a housing that is arranged radially outward from the airfoils of the rotating component;
• wherein the coil is arranged as a circumferential winding arranged radially outward from the rotating component within the circumferential slot, and wherein the coil has a coil diameter (D) that is sized relative to a chord length (L) of the plurality of airfoils such that:
• 0.25 L≤D≤1.50 L;
• and
• distributing the current induced within the second electric machine element using a control system that is electrically connected to the second electric machine element, wherein the control system is completely encapsulated within the circumferential slot, and wherein the coil of the second electric machine element connects to a first side of the control system, extends continuously about the circumferential slot, and connects to a second side of the control system;
• wherein rotation of the rotating component causes the plurality of first electric machine elements to generate a dynamic magnetic flux to induce the current within the second electric machine element, and
• wherein the current is distributed to at least one of a storage device or electrical components of the gas turbine engine.