ELECTROMAGNETIC RESONANCE VIBRATOR DRIVE Russian patent published in 2000 - IPC

FIELD: miscellaneous vibration machines. SUBSTANCE: vibrator has H-shaped magnetic core with two armatures separated from the latter by gaps δ₁, δ₂. Field windings are connected to two adjacent arms of single-phase bridge circuit. Connected to two other arms are switching control devices. Connected across diagonally opposite pair of terminals between common points of switching devices and field windings is ac voltage supply. Connected in series with reactor across other pair of diagonally opposite terminals of bridge circuit is DC voltage supply. Alternate turn-on of switching devices ensures connection of ac circuits to coils carrying DC magnetizing current. EFFECT: improved power developed by vibrator, reduced vibration phase drift due to variation of vibrator inherent resonance frequency. 5 dwg