System for actuation of a thrust reverser unit of a jet engine of an aircraft

A system for actuation of a thrust reverser unit of a jet engine of an aircraft, the actuation system comprising at least one actuator associated with at least one electric motor to set the thrust reverser unit in motion from a stowed position to a deployed position, in an extension phase, or from the deployed position to the stowed position, in a retraction phase, wherein at least one electric motor comprises a stator core belonging to a group comprising:

• a stator core that is solid and non-laminated;
• and
• a stator core that is laminated and that comprises N thick laminations each having a thickness greater than or equal to Tmin, with N∈[1, 100] and Tmin=2 mm;
• said stator core giving the electric motor a dissipative character and being configured to dissipate at least part of the energy E generated by said at least one electric motor when said at least one electric motor counterbalances a tensile load to which the actuation system is subjected during the extension phase.