Loss Identification using Inverse Thermal Modelling in Cage Induction Motor
Sähkötekniikan korkeakoulu | Master's thesis
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AEE - Master’s Programme in Automation and Electrical Engineering (TS2013)
AbstractInduction motors play a key role in moving the wheel of the modern industry with ever increasing demand and need of high performance and more efficient electric machines. To meet this ever increasing demand, this thesis covers the base of it i.e. losses occurring in the induction motor and thermal modelling of motor on the basis of the losses. In order to compute the iron losses, COMSOL Multiphysics has been put to use which is a very useful for vast analysis on the basis of Finite Element Analysis. A quasi 3D model of the induction motor is built in COMSOL to compute the losses occurring in the stator and rotor of the induction motor. These losses are then put to further application by building 3D thermal model of the same motor in COMSOL Multiphsics for modelling the thermal behavior of the machine. In order to validate the theoretical work, experiments have been conducted on actual machine. In order to get vast practical data of temperature from the motor, a dedicated printed circuit board embedded with PT100 RTDs is designed to be put inside the stator of the machine while manufacturing. In the end, a detailed comparison of the simulated and measured results is done for deep understanding of the loss and thermal behavior phenomena. The experimental results validated the thermal modelling for the simulated losses by showing strong coherence with the simulated results. The temperature rise data from sensors sheet inserted in the stator came out to be very useful in validating the results and in using the inverse thermal computation of losses.
Thesis advisorOsaruyi, Osemwinyen
electric Mmchines, iron ioss, copper ioss, heat transfer, finite element analysis