Finite length effects in linear induction machines with different iron contours

Finite iron and winding lengths are significant factors in determining the performance of linear induction machines. This study provides information on the effect of the iron contour on machine performance, and also aids in the evaluation of other analytical models by pointing out the importance of the proper treatment of finite iron length. The analytical model used here, developed by Mosebach, is based on Fourier series expansions of the electromagnetic quantities and the air-gap length. The magnetic flux density, current density, force density, and efficiency are compared for six iron contours. One case with a graded winding is also considered.