Thermal analysis of an electrical machine taking into account the iron losses and the deep-bar effect

The temperature distribution over the cross-section of an asynchronous squirrel cage machine is calculated by taking into account the copper losses and the iron losses at the steady-state condition. Under transient conditions, the deep-bar effect in the rotor is taken into account. Due to the deep bar effect, the current densities and thermal sources in the bar change and as a consequence the resistances, the leakage reactances, the currents and the thermal sources in the stator copper are also altered. Resistances depend upon temperatures.