METHOD FOR DETERMINING MUTUAL INDUCTANCE OF MAGNETISATION CIRCUIT OF VARIABLE FREQUENCY ENGINE Russian patent published in 2011 - IPC G01R27/02 

FIELD: engines and pumps.

SUBSTANCE: to computing device there introduced are values of frequencies of rotor rotation and magnetic field of stator, phase voltage and phase current of stator, phase angle between current and voltage vectors of one and the same phase of stator winding, active resistance of phases of stator and rotor windings and magnetisation curve of magnetic circuit as per which in computing device there determined is value of mutual inductance as per current magnetisation current value, the module of which is determined in the same computing device by the formula , where I₁ - stator current; R₁ - stator winding resistance; R₂ - rotor winding resistance; φ - angle between I₁ and U₁ of the same stator winding phase; ψ₂ - angle between vectors of e.m.f. and current of rotor winding; |z₀| - modulus of full resistance of stator winding phase.

EFFECT: possibility of faultless control of variable frequency asynchronous engine in all operating modes at changes of saturation of magnetic circuit.

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