The asymmetrical three-phase induction motor fed by single phase source: comparative performance analysis

The asymmetrical three-phase induction machine fed by a single phase source, already discussed in previous work (L. Martins Neto et al., 1994), has nothing more than an ordinary squirrel cage motor. These windings have the ordinary spatial design with a displacement of 120/spl deg/ between them, but with a different number of turns in each phase. With a proper relation of number of turns in each phase and with the help of a capacitor connected between phases B and C, it is possible to make the induction motor produce nominal power at nominal speed. This research had the following structure: discussion of the mathematical modeling, study for the minimization of the oscillating torque, starting time, etc., and presentation of results through digital simulation and performance comparison with a similar symmetrical induction motor. Digital simulation takes into account time and space harmonics for the symmetrical and asymmetrical induction motors.