1. An eight-pole de machine has a rotor with sixteen (two-layer) slots and com- mutator segments as shown below. N 10° S

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1 An Eight Pole De Machine Has A Rotor With Sixteen Two Layer Slots And Com Mutator Segments As Shown Below N 10 S 1 (164.12 KiB) Viewed 13 times

1. An eight-pole de machine has a rotor with sixteen (two-layer) slots and com- mutator segments as shown below. N 10° S S Rotor radius r Rotor axial length 1 HUN wm N N B=-B, (at airgap near N pole) Red S s B = Bir (at airgap near S pole) N (a) (10 pts) In the figure shown in the next page, complete the retrogressive lap winding using sixteen coils, by locating coil sides into slots in their full pitch and connecting them to the corresponding commutator segments. • Indicate the indices (numbers) for the coil sides and letters (a, b, c, etc.) for the commutator segments. • Draw the minimally required brushes at proper locations. (b) (10 pts) Considering the effect of dead zones, calculate the maximum and the minimum induced armature voltages in terms of Wm, r, 1, B, (>0), and the number of turns of each coil (N.).