27 Distributed windings 1

27 Distributed windings 1 - Lecture 27 Distributed Windings...

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Lecture 27 Distributed Windings This analysis will help us visualize all types of machines from a new perspective. Distributed windings generate a field distribution around the air gap that can generate a rotating magnetic field. We have seen hitherto the concentrated winding were all turns are concentrated in one slot. Applying Ampere’s law around an arbitrary path C, C H dl Ni = i L To calculate the integral, the mmf drop in the iron is neglectable compared to the mmf drop across the air gap. Let the reference direction across the air gap be radially outwards. H 1 moves radially inward and is negative. H 2 is outward and thus positive. () ( ) 12 C H g H g =− + i ± By symmetry, H 1 = -H 2 , ( ) ( ) 22 2 2 C H g − + = = i ±
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Furthermore, by symmetry if we apply Ampere’s law to any other smaller contour, we would get the same result. Irrespectively of the contour, we always get the same value of H, and it is distributed around the air gap as shown in the following figure.
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This note was uploaded on 01/27/2011 for the course ECSE 361 taught by Professor Franciscodgaliana during the Spring '09 term at McGill.

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27 Distributed windings 1 - Lecture 27 Distributed Windings...

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