METHOD FOR DETERMINING THE RESISTANCE OF THE PHASES OF THREE-PHASE ELECTRIC ROTATING MACHINES WITH COMBINED WINDINGS Russian patent published in 2019 - IPC G01R27/16 G01R31/34 H02K11/20 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in testing electrical machines – synchronous, asynchronous electric motors and generators with combined windings ("Slavyanka" type windings) and quality control of their execution, and can also be used in development and research of structural solutions of energy efficient electric machines with combined windings and control systems (controllers), adapted to use with such machines. Method of determining resistance of superimposed windings determines a sequence of actions and a mathematical model for determining values of resistances of superimposed windings at parallel connection of "star" and "triangle" and consists in the following. Resistance value R₃ is determined between terminals of windings 3 and 1, 1 and 2, 2 and 3, values of resistance between terminals – R₃₁, R₁₂, R₂₃ respectively. Resistance value R₄ is determined between terminals 1, 2, 3 of winding and neutral terminal. Determining the resistance value of "star" R_s as difference of tripled value R₄ and value R₃:R_S=3R₄-R₃. Determining resistance value of "triangle" R_d as ratio of star R resistance product and difference of tripled value R₄ and R₃ to difference of double value R₄ and R₃:

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Method can differ by the fact that in the presence of tasks of controlling the quality of winding of the electrical machine enables to verify the correctness of the combined winding by estimating the ratio of resistance "triangle" R_d to resistance of "star" R_s, which should be in range of 2.9–3.1.

EFFECT: possibility of determining electric losses in combined windings and creation of adequate substitution circuits for control systems of electric machines with combined windings.

1 cl, 5 dwg