Electrical machine rotors (R) suited for synchronous motors of electric vehicle drives. A rotor (R) includes a rotor shaft (8), a sheet stack (3), windings, and a restraining system (2) with support elements. The support elements of the restraining system include support rings (7) to protect winding heads (4) projecting from the sheet stack (3) in the axial direction against radial stresses. The elements of the restraining system (2) protecting the winding heads (4) from stresses also include axially inner end caps (6) configured as supports for the finished winding heads (4) in the operating state, and as guides and supports during the winding of the pole windings of the rotor (R) about the axial edge of the sheet stack (3). The axially outer support rings (7) cooperate with the axially inner end caps (6) so that the support rings (7) may absorb centrifugal forces acting on winding heads (4) end caps (6).