Abstract: A motor sub-assembly for an electromechanical brake actuator of an aircraft wheel includes a casing, a shaft mounted in the casing, and an electric motor mounted in the casing rotate the shaft, the shaft having an end connected to a screw-and-nut assembly to exert a force on a stack of disks for braking the aircraft wheel. The shaft has a first set of teeth and the motor sub-assembly has a shuttle mounted to slide relative to the casing and provided with a second set of teeth. The motor sub-assembly includes a selector mechanism that moves the shuttle selectively between first and second positions in which the first set of teeth is engaged and disengaged with the second set of teeth, respectively. The motor sub-assembly includes a holder device that holds the shuttle in the first position and a locking device that continuously prevents the shuttle from rotating relative to the casing.

Abstract: The invention provides a bistable electromagnetic actuator comprising a yoke extending in part around a pivot axis of the actuator, an excitation coil supported by the yoke in order to generate control magnetic flux, a rotor movable about the pivot axis of the actuator and suitable for being held stationary in two stable angular positions as a function of the magnetic flux generated by the coil, an actuator member coupled to the rotor in order to form an assembly that can be turned, and a manual control device including a drive shaft dynamically coupled to the rotor in such a manner that turning the drive shaft causes the rotor to turn.