Transient Analysis of a Linear Induction Machine Using the d,q Pole-By-Pole Model

An evaluation of transient as well as steadystate behavior of linear induction machines (LIM's) is essential for high horsepower applications. The pole- by-pole model, a low order coupled circuit model derived for arbitrary excitation, provides a unique method of analyzing such behavior. In this paper a computer simulation algorithm suitable for either analog or digital computation is derived. To illustrate the flexibility of the approach practical application considerations such as acceleration response, behavior with an inverter supply and the effect of frequency step changes and SCR failure are modeled. Where feasible, computed waveforms are compared to test measurements from an actual prototype machine.