Scale-model linear induction motors with solid iron secondaries

The performance of large linear induction machines with nonlinear secondaries is predicted utilising the principle of electromagnetic similitude and small-scale models. A set of scaling factors is derived and confirmed initially using a pair of physically similar solenoids with solid iron cores. Static and dynamic characteristics of the model are scaled and compared with the full-size machine for both dynamic a.c. and dynamic d.c. braking modes. It is concluded that the technique can be used, instead of analysis, to give adequate prediction of performance.