Unbalanced Operation and Single-Phase Induction Machines

The extension of symmetrical components to analyze unbalanced conditions, such as an open‐circuited stator phase, is generally achieved by revolving field theory. This chapter explains unbalanced applied stator voltages, unbalanced stator impedances, open‐circuited stator phase, and unbalanced rotor resistors of the three‐phase induction machine. It discusses single‐phase induction motors. The chapter also illustrates several unbalanced and fault modes of synchronous machine operation.