AC DRIVE Russian patent published in 2002 - IPC

FIELD: electrical engineering; high-speed induction-motor drives. SUBSTANCE: ac drive has motor whose stator core slots accommodate stator windings integrated in three similar groups, three windings per group,; windings of one group are disposed in same slots and constitute one of phases; winding groups are spaced 120 electrical degrees apart; windings of one group are connected through switching members to phase voltage circuit of three-phase power supply and those of other groups are connected through other switching members to line voltage circuit of same power supply. Such connection ensures induction motor speed as high as up to 9000 rpm. EFFECT: enhanced torque of three-phase induction motor. 3 dwg