SPECIFICATION OF DETERMINATION THE INDUCTION MOTOR TORQUE BY THE MAGNETIC CORE MODES IN THE SATURATED AREA

Abstract

The error value of the formula for calculating the electromagnetic moment under the assumption of equality of magnetic energies and coenergies has been investigated under the operation conditions of induction motor (IM) the magnetic core in the saturated region. For serial motors, under nominal conditions, the error does not exceed 5%, with a voltage increase of 75%, the error increases to 40%. The specified value of the electromagnetic moment is determined by calculating the value of the integral dependences of the magnetic coenergy on the angle of the rotor rotation in the process of calculating the dynamic mode of attenuation the currents in the windings. To improve the efficiency of refined calculation method of the electromagnetic moment, the dependence of the correction coefficient in the Magneto-Motive Forse (MMF) function of the motor is proposed for use. The use of this pre-determined dependence significantly speeds up refined calculations. The substantiation of the results reliability of the refined definition of electromagnetic moment without the assumption of the equality of magnetic energies and coenergies is carried out by comparing the results of the nominal operating modes caculation of serial motors with two and six poles, which have a significant difference in the degree of saturation. References 17, tables 2, figures 2.