Calculation of mechanical and electromechanical characteristics of asynchronous motors with a short-circuit rotor with variable parameters of its equivalent circuit

When calculating the mechanical and electromechanical characteristics of asynchronous motors (AM), as a rule, their T-shaped equivalent circuits (EC) are used. Parameters of these circuits, determined from reference literature or catalogs, are constant values and correspond to the working part of the characteristics in terms of the rated speed or motor slip. Calculations of the mechanical and electromechanical characteristics of the AM at constant values of the parameters of the EC of AM in a wide range of their speed or slips lead to significant errors outside the operating part of the characteristics. The paper presents a methodology and algorithm for calculating mechanical and electromechanical characteristics of АМ with a short-circuit rotor at variable parameters of their equivalent circuit, as well as checking the coincidence of the results of calculating the characteristics according to the proposed algorithm with the calculation results obtained by another wellknown method.