A rotor for a hover-capable aircraft , comprising: - a support angularly fixed with respect to an axis (B, C) and housing an electrical power source ; - a unit rotatable with respect to said support about said axis (B, C) and housing an electrical load of the resistive type such as rotor blades anti-ice system; and - a power supply system (19, 19', 19ʺ, 19′′′, 19ʺʺ, 19′′′ʺ, 19′′′′′′, 19′′′′′′′) adapted to electrically power said electrical load ; said power supply system (19, 19', 19ʺ, 19′′′, 19ʺʺ, 19′′′ʺ, 19′′′′′′, 19′′′′′′′), in turn, comprising: - at least a first rotary transformer electrically interposed between said power source and said load ; said first transformer , in turn, comprising: - a first winding arranged on said support , electrically connected to said power source and which can be electrically supplied with an alternating voltage at a frequency value; - a second winding arranged on said unit , electromagnetically coupled to said first winding and electrically connected to said load ; - a stator carried by said support , rotationally fixed with respect to said axis (B, C) and to which said first winding is fixed; and - a rotor operatively connected to said unit and to which said second winding is fixed; said power supply system (19, 19', 19ʺ, 19′′′, 19ʺʺ, 19′′′ʺ, 19′′′′′′, 19′′′′′′′) comprising a capacitive circuit electrically connected to said first transformer , so as to reduce the reactive power absorbed by said first transformer ; characterized in that said stator comprises a first magnetic half-core and at least a first slot engaged by the first winding ; said rotor comprising a second magnetic half-core and at least a second slot engaged by said second winding ; said first and second magnetic half-cores being annularly shaped; said first magnetic half-core being housed inside said second magnetic half-core ; at least one of said first and second magnetic half-cores having a double-C section in a plane parallel to said axis (B, C). - a support angularly fixed with respect to an axis (B, C) and housing an electrical power source ; - a unit rotatable with respect to said support about said axis (B, C) and housing an electrical load of the resistive type such as rotor blades anti-ice system; and - a power supply system (19, 19', 19ʺ, 19′′′, 19ʺʺ, 19′′′ʺ, 19′′′′′′, 19′′′′′′′) adapted to electrically power said electrical load ; - at least a first rotary transformer electrically interposed between said power source and said load ; - a first winding arranged on said support , electrically connected to said power source and which can be electrically supplied with an alternating voltage at a frequency value; - a second winding arranged on said unit , electromagnetically coupled to said first winding and electrically connected to said load ; - a stator carried by said support , rotationally fixed with respect to said axis (B, C) and to which said first winding is fixed; and - a rotor operatively connected to said unit and to which said second winding is fixed; characterized in that said stator comprises a first magnetic half-core and at least a first slot engaged by the first winding ; said rotor comprising a second magnetic half-core and at least a second slot engaged by said second winding ; said first and second magnetic half-cores being annularly shaped; said first magnetic half-core being housed inside said second magnetic half-core ; at least one of said first and second magnetic half-cores having a double-C section in a plane parallel to said axis (B, C). <EOS>