Improving the Experimental Technique of Asynchronous Single-Phase Motors Equivalent Circuits Research

Abstract

The paper considers an improved experimental technique for determining the parameters of low-power single-phase and capacitor asynchronous motors equivalent circuits. The proposed technique differs from the classical one because it takes into account the branch of the equivalent circuit containing the active and inductive scattering resistance of the rotor winding in various operating modes. A system of nonlinear algebraic equations has been obtained based on the single-phase asynchronous motor equivalent circuits in ideal idling speed and short circuit modes. It has been shown that the resulting system can be reduced to a system of two equations. It is proposed to solve the indicated systems of equations by applying various iterative methods implemented in universal mathematical software of symbolic mathematics. The proposed technique makes it possible to determine such single-phase asynchronous motor replacement circuit parameters as the active and inductive scattering resistance of the rotor winding, and the inductive resistance of mutual induction more precisely in comparison with the classical one. The way of application of the obtained improved technique for determining the capacitor asynchronous motors parameters has been given. More precise experimentally determined values of parameters allow to increase the calculation accuracy of single-phase and capacitor asynchronous low power motors transients.