FREQUENCY-REGULATED ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2007 - IPC H02P21/12 H02P27/08 

FIELD: electric engineering, possible use in electric motors of various industrial applications, constructed on basis of asynchronous shorted motor.

SUBSTANCE: in frequency-regulated electric motor, rotation speed indicator is made in form of impulse indicator with additional output of angular movements, mounted in executive electric motor, or in transferring mechanism. Motor status tracking block, which computes current angular position of magnetic linkage on basis of given values of stator currents, and division block, which regulates value of active current, proportional to motor momentum, on basis of actual value of magnetic linkage of motor rotor, are introduced to electric motor. Due to such a construction of management system, in dynamic modes compensation of amplitude and phase errors of closed current contours is ensured due to precise orientation of coordinates system along rotor magnetic linkage vector, determined by value of computed angle α_ψr and ensured level of voltage on the motor which matches real values of equivalent phase voltages. Given management circuit ensures correct functioning of electric motor in broad range of speed management. Conditions of operation for motor and mechanism as a whole are improved due to prevention of dynamic launch overload shocks and due to limiting of current in motor windings.

EFFECT: improved dynamic characteristics (precision, time of regulation, increased reliability of operation of electric motor transformer due to increased speed of operation and increased precision of momentum regulation and prevented current surges in transitional modes of acceleration and braking of speed of asynchronous motor; improved energy efficiency, increased service time of equipment.

4 dwg