As Φ = (Average value of constant amplitude flux density wave under one pole)∗(Area pertaining to one pole of the flux density wave), Φ = (Bav)(2πrL/P)and average value of the positive or negative half cycle of a sine wave = 2/π(peak value of sine wave). 10. In a 4 pole machine, what is the flux per pole produced, if the armature length is l and radius is r and Bp is peak value of sinusoidal flux?
A. 4Bplr
B. 2Bplr
C. Bplr
D. Bplr/2
Answer:A
As Φ = (Average value of constant amplitude flux density wave under one pole)∗(Area pertaining to one pole of the flux density wave), Φ = (Bav)(2πrL/P)and average value of the positive or negative half cycle of a sine wave = 2/π(peak value of sine wave). 10. In a 4 pole machine, what is the flux per pole produced, if the armature length is l and radius is r and Bp is peak value of sinusoidal flux?
A. 4Bplr B. 2Bplr C. Bplr D. Bplr/2
Explanation: Total flux per pole=4/PBplr, since P=4, Φ=Bplr. 11. The equation for flux per pole Φ=4/PBplr, is valid for _____________