Prediction of flux density and open circuit voltage in large skewed synchronous machines

Numerical methods used in machine analysis can be very accurate, however, they can also be exceptionally time-consuming. A combined approach, when numerically obtained data are used in an analytical model, has been proposed as a solution to this problem. Unfortunately, test validation of air gap flux density models in large synchronous machines is difficult to obtain. In this work, based on the permeance model, an analytical technique has been developed to predict air gap magnetic flux density and open-circuit voltage in large synchronous machines with a skewed stator. Simulation results compare well with both rated characteristics and test measurement.