Space-Vector Characterization of Induction Motor Operating Conditions

Induction motors are treated as the workhorse of modern day industries. During operation, they are subjected to various operational stresses that degrade their performance with time. Condition monitoring of induction motors are thus of prime importance. Among several techniques, the stator current on-line monitoring technique is one of the popular techniques for health monitoring and fault diagnosis of induction motors. Stator currents' Park's pattern or Concordia pattern has been demonstrated to be indicative of the state of motor health and any incipient fault. These Concordia patterns, however, are also affected by operating conditions of the motor such as supply voltage and mechanical loading. The aim of this paper is to observe the effects of variations in external operating conditions on the stator currents' Park's pattern. External operating conditions include stator supply voltage variations in balanced and unbalanced manner and also mechanical load variations in balanced and unbalanced manner.

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