Drive device for applying a magnetic pulse to a mechanical assembly and aircraft load ejection device implementing same

Drive device which is intended to apply a high-energy magnetic movement pulse to a mechanical member in order to apply acceleration thereto, comprising:

• a mounting,
• at least one electromagnetic coil which is fixed in this mounting and which has an axis of revolution and a central passage which is centered relative to this axis,
• a piston which has at least a portion made of a material having paramagnetic susceptibility, the piston being mounted in a sliding manner in the passage and placed in contact with the mechanical member when the drive device is in the rest state, and
• electrical energy supply means for the coil, which means are provided in order to store electrical energy and to abruptly release this energy into the coil and thus apply the high-energy magnetic movement pulse to the mechanical member, wherein
• the piston comprises a stack of blocks having a peripheral shape which is adapted to that of the passage, the blocks in the stack being made alternately from the material having paramagnetic susceptibility and an insulating material;
• and
• the electrical energy supply means are provided in order to allow the energy to be applied to the coil in the form of a series of electrical pulses which appear as the piston moves.