Electrical power supply device for powering at least one piece of equipment of an aircraft rotor, and an aircraft

An electrical power supply device for powering at least one piece of equipment of an aircraft rotor driven by a mast, said device comprising a removable pole suitable for being reversibly secured to said mast, said pole having a rotary casing provided with fastener means for fastening to said mast, and a non-rotary casing secured to link means suitable for being fastened to a reference member of said aircraft, wherein said pole comprises:

• a non-rotary converter fastened to the non-rotary casing and provided with an inlet suitable for being fed with electricity coming from an electricity network of said aircraft, said non-rotary converter being an electrical converter that generates AC at a frequency higher than one kilohertz from said electricity fed to the inlet;
• and
• a rotary transformer incorporated in the pole, said transformer having a primary member secured to the non-rotary casing and a secondary member secured to the rotary casing, the primary member being connected to the non-rotary converter to receive said AC, and the secondary member being suitable for electrically powering equipment of a rotor.