DISTRIBUTION OF LOCAL LOSSES AND TEMPERATURE IN THE ROTOR OF A NON-SALIENT POLE MOTOR IN NON-SYNCHRONOUS MODES

<jats:p>A methodology for complex calculation of the electromagnetic and temperature fields using finite-element method under the steady-state and transient conditions of electric motors is presented. The problems for industrial consumers that arise under conditions of slow acceleration when the starting of the power asynchronous and synchronous motors con-nected to the loads with high inertia are considered. The numerical modeling of the asynchronous initiation was carried out for various parameters (time, starting voltage and current) of unsteady condition. The results of theoretical studies regarding the distribution of heat generation in rotor elements in long and short-term operating modes of the motors with slip are presented. The patterns of physical heat transfer processes in a solid rotor when powering a non-salient-pole motor by the sources of different voltages are analyzed. The magnitude of inaccuracies at determining the maxi-mum calculated temperature of the surface elements of the rotor and data on the full-scale test program at the installa-tion site of temperature sensors when starting a power motor, due to the specifics of conducting experimental studies on its rotating part, have been determined. It has been shown that the difference between the maximum heating at certain time moments of the regime can reach a double value. It has been established that the thermal processes in a solid rotor limit the load of a non-salient pole motor in asynchronous modes. References 9, figures 9.</jats:p>