VARIABLE-RATIO TRANSFORMER WITH ROTARY MAGNETIC FIELD Russian patent published in 2004 - IPC

FIELD: electrical engineering, transformers with magnetization. SUBSTANCE: variable-ratio transformer has external laminated hollow cylinder with trapezoidal slots in inner surface to drop multiphase primary winding and internal laminated cylinder with trapezoidal slots in outer surface to accommodate secondary winding, magnetic shunt in the form of intermediate hollow cylinder with trapezoidal slots in outer and inner surfaces to drop magnetization winding. Primary windings of current transformers are placed correspondingly in phases A, B, C of load. Rectifiers are supplied from secondary windings f current transformers. Adjusting rheostat is meant to set output voltage. Shunt permeance is adjusted by change of current in its magnetization winding, Value of magnetization current is adjusted by automatic regulator incorporating current transformers and rectifiers which alters voltage in proportion with change of load current. Changing current in magnetization winding it is possible to alter value of magnetic flux linked with turns of secondary winding put on secondary yoke and consequently value of output voltage. EFFECT: exclusion of additional external D C power supply source needed for feeding of magnetization winding of shunt, increased stability of output voltage with rise of load current. 2 dwg