Essay On Electrical Asymmetry
Introduction
On the industrial plan, the alternative actuators fed through a three-phase distribution are still widely majority. The power so delivered to the machine is distributed on three phases, while the maximum power level is imposed at the same time by the capacity of the distribution chain of energy and by that of the electric actuator.
The three phase induction machines are considered as highly symmetrical electric systems, so any fault make it asymmetric. On the other hand, three kinds of asymmetry can characterize asymmetrical machines [Cop]: Electrical asymmetry results from unequal parameters of machine phases. Spatial asymmetry due to the windings distribution in the space. Magnetic asymmetry results from non-uniform air gap. An example of asymmetrical machine, which exposed to all together previous asymmetries, is single-phase induction motor.
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However, sometimes the operation can continue, but then in very altered circumstances, most often accompanied torque oscillations.
Theoretical development
A three-phase induction motor after losing one of its stator phases feeding while operating may be considered as a single-phase motor with the voltage supply across the other two connected phases [ref.]. However, the single-phase induction motor has two unbalance windings that is why considered as unbalanced induction motors. The mathematical representation deserves particular attention for the study of the three-phase induction motor due to the unbalanced condition presented in his stator. In this case, the stator parameters are changed in the common machine models.
Machine model
Three phase
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