Starting of large Motors-Methods and Economics
- Joseph Nevelsteen, Humberto Aragon
- IEEE Transaction on industry applications, vo1.25…
This paper presents a nonconventional method for soft starting of three-phase induction motors, which achieved by flux weakening technique. Flux weakening is not done by reducing the applied voltage as in the conventional methods. Flux weakening is achieved by increasing the supply frequency over the rated value while the voltage amplitude is kept constant. This method has advantage of reducing the stress on the electrical and mechanical systems. The feasibility of this basic idea has been confirmed through investigating the starting transient corresponding to this mode of operation. For this purpose, a rigorous state space mathematical model has been developed and simulated. The validity of the proposed method through the results from the mathematical model have been confirmed experimentally. KeywordsInduction motors, transient analysis, flux weakening, pulsating torque.