Abstract
Induction motors are failing due to various causes. The biggest factor in electrical failure is due to overheating. Single phase loss in which one phase of the three phases is suddenly opened is included in the occurrence of a major failure in an electrical failure. The generation of a single phase loss can overheat the stator winding due to an increase in current, which can lead to burnout. It also affects torque, so it can deliver large torque ripple to the shaft. Therefore, it is very important to clarify what kind of problem exists when a single phase loss of the induction motor occurs. In order to compare the change of operation of induction motor during normal operation and single-phase loss operation, the rotational coordinate system theory was introduced. In this paper, changes in current, electric power, and torque were analyzed when single phase loss occurred due to the power source side of the induction motor being operated normally. It was found that the existence or absence of current and the pulsation of the magnetic flux at any phase specified during one-phase loss operation greatly affects the torque and affects the electric power.
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