Thermal analysis and experimental investigation of radial and axial flux permanent magnet motors
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The following describes various approaches to thermal modeling of electric motors of various types and configurations. A number of novel methods were presented in both the experimental and modeling stages of modeling. The thesis lays down much of the groundwork for various efforts involved in the thermal modeling of electric motors. The experimentation of a radial-flux permanent magnet motor was presented along with methods for extracting clean and reliable data necessary for thermal model validation. Additional methods were presented for developing systems which allow users to independently control torque and speed, allowing convenient manipulation of the motor operation. Novel methods for the thermal modeling of axisymmetric machines such as motors were presented, and the relevant assumptions were outlined. Various correlations for the convective heat transfer coefficient (HTC) were numerically validated using ANSYS Fluent software. Results for simulations using finite volume methods and lumped- parameter thermal networks were presented and compared. It was shown that adjusting an inaccurate model to better represent convection results in a significant improvement to model accuracy. Finally, preliminary results and analysis of a thermal contact resistance measurement system were presented and issues with experimental validation were discussed. Although the root cause was not determined, many possible issues were speculated and addressed.
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M.S.