Transient Behavior of Induction Motor Flux and Torque During Run-Up

This paper analyses the various flux components that exist within symmetrical three phase cage induction motors, and how they manifest themselves as torque oscillations during run-up. A small, a medium and a large motor are evaluated to show that recent explanations of this phenomena by way of only the airgap flux may be misleading due to a lack of generally applying to motors of different sizes and parameter combinations.