PDF (Thesis) - Nottingham eTheses - University of Nottingham
PDF (Thesis) - Nottingham eTheses - University of Nottingham
PDF (Thesis) - Nottingham eTheses - University of Nottingham
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CHAPTER 8<br />
Filter realization and experimental<br />
8.1 Introduction<br />
results<br />
This last chapter shows and describes the final assembly <strong>of</strong> the output filter, providing<br />
the experimental layout followed by various experimental emission measurements to<br />
prove the effectiveness <strong>of</strong> the ouput EMI filtering. Different measurements for two<br />
running conditions supplying 50Hz and 100Hz output will be shown, comparing the<br />
emissions before and after the filter insertion to verify its attenuation; the experimental<br />
results will be provided not just for a standard aircraft supply at 115V and 400Hz but<br />
also for a standard grid supply at 240V and 50Hz.<br />
8.2 Assembling the output filter<br />
Given the chosen filter layout and parameters values designed in the previous chapter<br />
the output EMI filter has been built. The inductors have been manually wound in a sin-<br />
gle layer bobbin to minimize the parasitic capacitive coupling, using a 0.8mm diameter<br />
copper wire as suggested in the inductor code designer program. Regarding the two<br />
cores forming the global DM inductor (Fig. 7.14), the large one (AMCC 16A) allowed<br />
two bobbins <strong>of</strong> 45 turns, one on each side <strong>of</strong> the double C core; however the other one<br />
(AMCC 6.3), because <strong>of</strong> saturation, did not allow more than 40 turns, thus permitting<br />
the winding <strong>of</strong> just one side. After the two inductors, the DM 68nF capacitors have<br />
been connected toghether with the 10nF capacitor from their central point to earth. The<br />
ferrite tubes, around the output phase wires, as described in chapter 7 conclude the<br />
filter setup.<br />
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