Abstract: An electromagnetic oscillation motor has an asymmetrical four-pole stator with an a.c. winding including two paths connected in parallel. Each path includes two serially connected coils received on the adjacent poles of the stator. The poles of the stator forming one pair are offset in opposite directions away from each other, while the poles forming the other pair are offset toward each other relative to the symmetry axes of their corresponding poles of the armature, through a distance equalling one half of the angular width of the stator winding. The oscillation motor further comprises a four-pole symmetrical armature, its poles being provided with a d.c. winding. The coils of this winding are connected in pairs in the matched-series fashion, while the pairs themselves are interconnected in opposition.

Abstract: Disclosed is a vibratory screening machine comprising a frame, a pair of screens mounted in the frame one beneath the other, electromagnetic vibrating drives, and two sets of pushers. Located in the frame are stops rigidly secured in relation thereto. The pushers of the first set are connected to the vibrating drives and make contact with the screen closest to the drives. The pushers of the second set are positioned within the guides in alignment with the pushers of the first set and spring-loaded against the stops in the direction of said pushers of the first set.