Calorimetric Measurement of the Stator Core Losses Caused by Manufacturing
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AbstractThis thesis is a part of the research on the effect of the manufacturing process on the core losses of the electrical machine. Within this thesis, a special test setup, that has same flux density distribution as the actual machine in no-load, is used to measure only the stator core loss. For this, a slip-ring rotor is designed and constructed. Furthermore, a modified calorimeter is constructed to accurately measure the stator core loss. In order to account only for the stator core loss, the test setup is excited from the stationary rotor which is also thermally isolated from the measurement chamber of the modified calorimeter. The experimental setup is then operated at various conditions to determine the range of operation having optimal accuracy. After that, the stator core losses at frequencies ranging from 300 Hz to 1 kHz and air-gap flux densities ranging from 0.3T to 0.4 T, are measured and compared with the results obtained from the FE simulation (FCSMEK). The measured result at almost all the frequencies and the air-gap flux densities is found to be approximately twice of that obtained from the FE simulation. Furthermore, the accuracy of measurement is acceptable for this comparison, but for future study, i.e. comparing the difference after the heat treatment, the level of inaccuracy is too high. Thus, few modifications are recommended.
electrical machine, core loss, manufacturing effects, calorimeter