Расчет характеристик асинхронных двигателей по каталожным данным

Abstract

The article suggests algorithms for calculating the characteristics of induction motors (IMs) for different values of power supply voltage and frequency, and load torque without the need to apply iteration procedures. The proposed algorithms use only catalogue data, and there is no need to experimentally determine the IM characteristics. The proposed algorithms determine the parameters of IM equivalent circuits and take into account the nonlinear dependence of no-load current on power supply voltage and frequency. The above-mentioned nonlinear dependence is taken into account by calculating the relative magnetic flux in the stator core and determining the relative no-load current from the relative magnetization characteristic. In so doing, the best results are obtained in calculating the characteristics of moderate capacity IMs (approximately up to 5 kW) and especially in calculating the characteristics of induction micromotors having an increased relative no-load current. Example calculations of IM characteristics from catalogue data are given.