A rotor (3, 4) 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 (11, 12) rotatable with respect to said support about said axis (B, C) and housing an electrical load (21, 24) 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 (21, 24); 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 (21, 24); 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 (11, 12, 13), electromagnetically coupled to said first winding and electrically connected to said load (21, 24); - 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 (11, 12) 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 (25, 27) 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 (25, 27) 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 (11, 12) rotatable with respect to said support about said axis (B, C) and housing an electrical load (21, 24) 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 (21, 24); - at least a first rotary transformer electrically interposed between said power source and said load (21, 24); - 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 (11, 12, 13), electromagnetically coupled to said first winding and electrically connected to said load (21, 24); - 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 (11, 12) 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 (25, 27) 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 (25, 27) having a double-C section in a plane parallel to said axis (B, C).