METHOD TO CONTROL AND PROVIDE ROBUSTNESS OF THREE-PHASE INDUCTION MOTOR OF ROTARY OR RECIPROCAL MOTION Russian patent published in 2012 - IPC H02H7/09 H02H7/12 H02H7/122 

FIELD: electricity.

SUBSTANCE: in the method to control and provide robustness of a three-phase induction motor of rotary or reciprocal motion, phase windings of a motor stator are fed from a three-phase frequency converter operating in a current source mode. A signal of setting speed or rotary (reciprocal) motion of a motor rotor is sent to an inlet of a speed controller. The speed of a rotary (reciprocal) motion of the rotor is defined, getting three-phase systems of setting signals for phase currents at its outlet. At each interval of width-pulse modulation phase motor currents are analysed. In case a failure is detected in one of motor phases, a current vector of one serviceable phase is turned by an angle p/3, correcting instantaneous values of currents in two remaining phases of the induction motor for a leading phase and a lagging phase of the vector according to expressions given in the formula.

EFFECT: simplified process of control with reduction of duration of electromagnetic transition processes when switching into an emergency double-phase mode for a three-phase induction motor in case of emergency disconnection of one of phases and expansion of an application area.

6 dwg