METHOD OF SHOCK-FREE PICKUP OF FREQUENCY OF THE ROTATING ASYNCHRONOUS MOTOR Russian patent published in 2019 - IPC H02P6/00 H02P6/17 H02H7/00 H02P29/28 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to methods of protecting asynchronous electric motors from emergency modes. It is achieved by the method of shock-free pickup of frequency of the rotating asynchronous motor includes measurement of angular rotation speed of the rotor by means of a meter and formation of a signal of engine control for the current moment of time in the control unit. Angular rotation speed of the rotor and its phase are determined by signals on the motor terminals during the period of time between the occurrence of the power supply voltage and the end of the measurement time. Measured signals on the rotor rotation speed and its phase in the control unit are converted into a starting frequency signal, which through the frequency converter generates current in the motor windings with the same frequency with which the rotor of the motor rotated at the moment of completion of measurement of the rotor angular rotation speed.

EFFECT: technical result consists in continuous operation of AC motors controlled by frequency converters, with short-term loss of power.

1 cl, 2 dwg