METHOD AND ELECTRIC DRIVE FOR VECTOR CONTROL OF PERMANENT-MAGNET SYNCHRONOUS MOTOR Russian patent published in 1999 - IPC

FIELD: speed, torque and angular position control for various machines and mechanisms dispensing with transducers. SUBSTANCE: method for vector control of equiphase and orthophase stator currents involves measuring two-phase stator voltage and varying phases of equiphase and orthophase stator currents and rotor speed according to measured two-phase voltages and stator currents. Electric drive implementing this method has two-phase voltage sensor whose outputs are connected through integrators to sine and cosine inputs of direct and inverse Cartesian coordinate converters and to inputs of rotor speed and angular position computing unit. EFFECT: improved stability, enlarged range and improved precision of torque and speed control. 5 cl, 3 dwg