ELECTRIC MOTOR DRIVE Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: two single-phase bridge rectifiers and two controlled valves are inserted into supply circuit of each phase of stator of electric motor drive. In each phase of stator like output leads of rectifiers are connected to unlike leads-out of half-windings of phase of stator and other like output leads of same rectifiers are connected via controlled valves to other unlike leads-out of half-windings of same phase of stator. Inputs of rectifiers of each phase are linked to terminals of supply three-phase network which voltages are shifted by 90 deg. EFFECT: specified connection of half-windings makes it possible to enhance rotational speed of motor thanks to doubling of frequency of voltage fed to motor. 1 dwg