ASYNCHRONOUS MOTOR START-UP METHOD Russian patent published in 2015 - IPC H02P1/26 

FIELD: electricity.

SUBSTANCE: asynchronous motor start-up method consists in delivery of power supply to the motor stator windings via additional active resistance, which value is generated according to the law where R_s is active resistance of the stator windings; p is a number of pole pairs; U_su, U_sv are components in axes u and v of voltage vector at the stator windings; Ψ_su, Ψ_sv are components in axes u and v of the stator flux linkage vector; ω_n is rotation velocity of the coordinate system; Ψ² _s is amplitude square value of the stator flux linkage vector; M is value of electromagnetic torque; M_n is desired value of electromagnetic torque calculated as per the specified Kloss's formula.

EFFECT: reduced pulsation of the motor electromagnetic torque and current at its start-up provided that dynamic overvoltage is limited at semiconductor switches switching delivery of voltage to the stator windings to the closed electric circuit.

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