ELECTROMAGNETIC TORQUE CONTROL DEVICE FOR ALTERNATING-CURRENT TWO-PHASE MOTOR Russian patent published in 2014 - IPC H02P25/02 

FIELD: electricity.

SUBSTANCE: invention is related to the area of electric engineering and may be used for electromagnetic torque control of alternating-current two-phase squirrel-cage induction motor. Excitation winding of the squirrel-cage motor is coupled to the alternating-current power supply in series connected through a compensating load unit, which, in its turn is connected in parallel with a switching unit. Input of the switching unit is coupled to output of the amplification coefficient control device, which is coupled to the first input of the amplifier with controlled amplification coefficient. Input of the amplification coefficient control device and the second input of the amplifier with controlled amplification coefficient are coupled to the voltage control source and output of the amplifier with controlled amplification coefficient is coupled to input of the power amplifier, which is connected in parallel to the control winding.

EFFECT: improved efficiency factor, reduced heat generation in the motor windings due to introduction of the operation mode with reduced electromagnetic torque.

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