Patent ID: 8723383

Claim:
A buried-magnet internal rotor for an electric rotating machine, the rotor comprising: a shaft, a plurality of polar parts made of a magnetic material surrounding the shaft, the polar parts delimiting housings between them; a first lateral shroud and a second lateral shroud positioned axially on each side of the polar parts and mounted on the shaft, the shaft passing through each lateral shroud through a central opening in each lateral shroud; an external ring; at least one tie-rod per polar part, the tie-rod clamping each polar part between the lateral shrouds; and a plurality of permanent magnets placed in the said housings so that one permanent magnet is positioned between adjacent polar parts; wherein the shaft is shaped so as to form an internal shoulder forming an axial abutment against which the first lateral shroud is held axially by the external ring radially secured to the shaft; and wherein the second lateral shroud is mounted on the shaft so as to be capable of sliding along the shaft.