TORQUE MOTOR Russian patent published in 1999 - IPC

FIELD: electrical engineering; permanent- magnet motors; precision servo systems and hydraulic regulators. SUBSTANCE: motor has rotor incorporating rotor hub 1 and magnetic core 2, inductor with permanent magnets 10 separated by pole shoes and secured on nonmagnetic bushing of stator 9, armature windings 3 wound on rotor , and two brush holders 7 with brushes 6 moving over commutator bars 5. Newly introduced in motor are axially magnetized magnetic screens 11 on each end of inductor, twice as many as permanent magnets 10; in section where pole shoes are overlapped, thickness of magnetic screens 11 makes up one fourth of that of magnet in magnetizing direction; in section where magnets are overlapped up to their center, their thickness reduces obeying linear law down to zero; permanent magnets and screens abut against one pole shoe through like-polarity poles. EFFECT: improved operating precision of instruments incorporated in motor control system due to reduced magnetic leakage. 4 dwg