Rotor for a rotary electric machine

A rotor for a rotary electric machine, comprising a rotor body comprising laminations stacked on one another, the rotor body having a plurality of recesses, at least part of the recesses, or even all the recesses, accommodating one or more permanent magnets defining poles of the rotor,

• the recesses of a pole being arranged in at least a first and a second row of recesses,
• the first row of recesses comprising three recesses arranged in a U, with a central recess and two side recesses, a length (L2) of a larger rectangle enclosed in the central recess being equal to +/−20% of the length (L1) of the largest rectangle enclosed in a side recess,
• at least one of the side recesses comprising a notch that extends from the side recess beyond the central recess,
• each side recess of the first row forming a material bridge with the central recess, the two material bridges each having a longitudinal axis, the two axes being parallel to one another,
• a ratio (B-A)/B being between 10% and 30%, wherein A is a width of a recess of the second row and B is a width of a central recess of the first row.