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The dynamic performance of electrical machines is affected by low and unbalanced voltages, frequency variations in its supply systems and pulsating load torques. In this paper the d-q axis model in the synchronous reference frame is used in the dynamic analysis on the performance of an asynchronous machine working under a no- load, unbalanced voltages and pulsating load conditions. The per-phase parameters of a 1.5 hp, 380 V, 50 Hz, 4 poles, 3 phase asynchronous machine used in the simulation were computed with reading obtained from a dc, no-load and blocked rotor tests carried out on the machine in the laboratory. The results obtained from the computer simulations confirmed the capabilities and limitations of asynchronous machines in practical applications.
Keywords: dynamic, asynchronous machines, simulation, synchronous reference frame, no-load, block rotor.