METHOD FOR CONTROL OF INDUCTION FREQUENCY-CONTROLLED ELECTRIC DRIVE WITH SHORT-CIRCUITED ROTOR AND TRACKING SYSTEM FOR ITS REALISATION Russian patent published in 2012 - IPC H02K21/12 H02P27/06 H02P27/10 

FIELD: electricity.

SUBSTANCE: in the method to control a frequency-controlled induction electric drive with a short-circuited rotor there is a setter used arranged as a relay controller, from which a signal of optimum accuracy arrives to an input of frequency converter speed control. A tracking system comprises a frequency converter implementing vector control, an induction motor with a short-circuited rotor. The setter comprises a sensor of phase currents, a sensor of instantaneous speed signal value, a sensor of phase voltages, a converter of current phase number, a vector-analyser, a converter of voltage phase number, rotators of current and voltage, a unit of parametric coefficients, a unit of switching function coefficients, a unit of summators, a unit of multiplication, a summator, a unit of setting signals, a unit to produce a setting signal for rotor flux linkage and an appropriate coefficient of PI-controller, a unit to produce a setting signal for rotor flux linkage and an appropriate PI-controller coefficient, a relay with high switching frequency, a scaling unit, a multiplier, a selector and a switch connected as specified in application materials.

EFFECT: production of control of optimum accuracy over speed of shaft rotation in a frequency-controlled asynchronous electric drive with a short-circuited rotor.

2 cl, 1 dwg