ELECTRODYNAMIC VIBRATOR Russian patent published in 1995 - IPC

FIELD: testing equipment. SUBSTANCE: Electrodynamic vibrator has: magnetic circuit with ring-type air clearance formed by poles of pivot and yoke, assembled from ferromagnetic washers, between which screening coils of nonferromagnetic material are located; movable coil, that is rigidly linked to table and suspended by elastic springs and placed in the air clearance; stationary coil for magnetizing, that is fixed on pivot. Each ferromagnetic washer has radial cut, in which end of each preceding screening coil is connected with beginning of following one. In the case coils of pivot and yoke are electrically insulated from ferromagnetic washers and joined to each other in series and their free ends are through switch connected in parallel and opposite to movable coil. EFFECT: improved design. 5 dwg