Non-Contact Propeller De-Icing System

Diversified Technologies, Inc. (DTI) proposes to develop a reliable, non-contact, retrofittable de-icing power transfer technology to improve the propeller de-icing system for the E-2C, C-2, P-3 and C-130 turboprop aircraft. The proposed system willoperate efficiently with low noise and weight. Specifically, DTI proposes to utilize the available 400 Hz electrical power to operate a rotating transformer to couple power to the spinner. The power transfer system will be adapted to the T56-A-425/427turbine engines, and retrofittable by removing the existing carbon brush and ring assemblies. The transformer primary couples over a full arc or sector that coincides with the existing brush assembly volume. Circuit impedance matching elements can beinserted to cancel the reactive effects of the transformer making the net result a purely resistive power transfer from the generator standpoint. Variations of the concept are applicable to a diverse set of military and commercial rotorcraft and fixed wingaircraft.During Phase I DTI will design, build, and test a full-scale power transfer system to prove technical feasibility and, optionally, perform an aircraft integration study to show retrofit capability. The proposed non-contact approach will significantly increase the reliability and reduce the maintenance requirements for the de-icing power transfer system. The system will be retrofitted into the available volume for minimum engine impact. It hasadditional power transfer capability in the event greater de-icing power is desired. This concept is applicable to a wide range of military and fixed-wing aircraft and rotorcraft, as well as rotating systems such as air surveillance radars. The completelyencased, non-contact system does not generate, and is unaffected by, airborne contaminants; is impervious to the presence of corrosive hydraulic fluids; and has no permanent magnet to attract contaminating ferromagnetic particles. The elimination ofspurious electrical noise by removing the brushes will also improve radar, electronic countermeasure system, and avionics operation.