SYNCHRONOUS ROTATING ELECTRICAL MACHINE WITH A DOUBLY EXCITED ROTOR

摘要

The machine (1') has a rotor (11) comprising permanent magnets (PM) and excitation coils (EC). The magnets are housed in first axial recesses (E1) distributed over a circumferential portion of the magnetic mass of the rotor, thus defining circumferential pole sections. The coils are housed in second axial recesses (E4) distributed in an intermediate portion of the magnetic mass. According to the invention, a circumferential pole section comprises at least one means (ET) for directing part of the magnetic flux from a corresponding permanent magnet to the stator (10) so as to introduce rotor-stator magnetic coupling when a substantially zero excitation current flows through a said corresponding excitation coil (EC).