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Unformatted text preview: winding. a) Draw the developed diagram for the b-phase MMF. (10 pts) b) How many poles does this machine have? Explain briefly. (5 pts) c) Based upon your understanding of where would you wrap a coil such that you obtain the maximum electric field due to time-changing current in the b-phase winding? Explain briefly. Draw the coil on the figure and label it maximum E coil. (5 pts) 4. A 3-phase machine has the stator windings energized such that , , . You run around the stator counterclockwise at 45 rad/s. As you are running, you always observe the peak airgap flux density of 1 T. Plot the flux density you would see if you stopped and held yourself fixed at that position on the stator over 1 electrical cycle of time ( s). (10 pts) E t d d B = i as 90 t ( 29 cos = i bs 90 t 2 3------ cos = i cs 90 t 2 3------+ cos = 2 90------...
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- Fall '08