Aircraft propulsion assembly provided with a rotary transformer for supplying the blades with electrical energy

A propulsion unit for an aircraft, including an engine and a propeller shaft driven in rotation by the engine, said propeller shaft passing through a sealed case containing a lubricating fluid, the propulsion unit further including a propeller with airfoils which is coupled to said propeller shaft and comprising electrical members that are electrical power consumers, the sealing between said sealed case and said propeller shaft being ensured by a dynamic seal housed between a rotating dynamic seal support angularly secured to said propeller shaft and a dynamic seal support flange secured to an end portion of said case facing said propeller, said rotating dynamic seal support being secured to said propeller shaft while being axially held in abutment against a bearing or supporting said propeller shaft, the propulsion unit being characterized in that, in order to deliver electrical power to said electrical members, it comprises a rotating transformer rotated by said propeller shaft and including on the one hand a stator, a casing of which is secured to said dynamic seal support flange and on the other hand a rotor, a casing of which is secured to said propeller shaft.