ProblemHello. This is my final exam, and I'm kinda clueless about it. I need someone who can help me solve this, and in return, I offer you my gratitude, my sister's email and I'll buy you two CDs via CdNow or Amazon. My name is Antonio Camacho Mora and my mail is acm@espiral.cjb.net. Thanks in advance and God bless you. Good Luck :)In Fig. 439A is shown a portion of a 6pole 500kw, 250volt dc generator. Two complete magnetic circuits are shown, as well as portions of two others. The outside diameter of the armature is 30 in., the radial thickness of the armature iron including the teeth is 4.5 in, and the gross axial length of the armature is 14 in. The slots are 1.5 in deep. The pole cores are 7 by 13.5 in, and the pole faces are 10 by 13.5 in. The radial thickness of the yoke is 3 in., and the axial length is 16 in. The pole cores and the armature are made of dynamo sheetsteel laminations, the magnetization curve for which is given in Fig. 202 (p. 258). The ratio of net to gross iron in the armature and the field cores is 0.92. The yoke is of rolled steel, the magnetization curve of which is essentially that for cast steel in Fig. 202.
The general + path of the useful flux and the leakage flux 1 is indicated. The leakage factor, the ratio ( + 1)/ , is 1.20. In computing the ampereturns for the pole cores, the ampereturns for the pole pieces may be neglected, a length of 7 in., being used. The airgap has an equivalent length of 0.3 in. When the airgap flux is 5.6 x 106 maxwells, determine:
a) Average flux density in airgap Using the magnetization curves, Fig. 202, determine: f) Ampereturns for each pole core g) Ampereturns for yoke h) Total ampereturns per pole
