DEVICE FOR MATCHED ROTATION OF ASYNCHRONOUS MOTORS WITH SQUIRREL-CAGE ROTORS Russian patent published in 2016 - IPC H02P5/46 H02P5/485 H02P5/747 

FIELD: engines.

SUBSTANCE: device for matched rotation of asynchronous motors with squirrel-cage rotors relates to electrical engineering and is intended to provide matched rotation of two asynchronous motors with squirrel-cage rotors, and can be applied to electrical engineering. Device comprises two asynchronous motors with squirrel-cage rotors, each having two independent groups of stator windings. Inputs of first groups of stator windings in asynchronous motors with squirrel-cage rotors are connected to supply mains, while outputs of these windings are connected to three-phase rectifiers, to polar outputs thereof transistors are connected. Bases of transistors are connected to outputs of pulse-width modulators. Outputs of second groups of stator windings of asynchronous motors with squirrel-cage rotors are connected as stars, outputs of star connections and their zero points are bound by four-wire communication line. To one wire of communication line, primary winding of current transformer is bound, secondary winding thereof is connected to shunt resistor and signal input of phase-frequency rectifier. Synchronising input of phase-frequency rectifier is connected to phase voltage of supply mains. Output of phase-frequency rectifier is connected via correction link to first inputs of adders. On second inputs of adders voltage setting is supplied.

EFFECT: outputs of adders are connected to inputs of pulse-width modulators.

1 cl, 1 dwg