Slots per pole= 96/4=24, for a coil span of 21 slots, the coil is short pitched by 3 slots and the chording angle is ε=3γ and γ=180/24 ⇒ ε= 24.5° ⇒ Kp=cos12.25°=0.97723. 2. In 48 slot, 4-pole,3 phase alternator, the coil-span is 10. Its distribution and pitch factors are respectively ____________
A. 0.9717,0.966
B. 0.9822, 0.9814
C. 0.9577, 0.9814
D. 0.9577, 0.966
Answer:A
Slots per pole= 96/4=24, for a coil span of 21 slots, the coil is short pitched by 3 slots and the chording angle is ε=3γ and γ=180/24 ⇒ ε= 24.5° ⇒ Kp=cos12.25°=0.97723. 2. In 48 slot, 4-pole,3 phase alternator, the coil-span is 10. Its distribution and pitch factors are respectively ____________
A. 0.9717,0.966 B. 0.9822, 0.9814 C. 0.9577, 0.9814 D. 0.9577, 0.966
Explanation: Slots per pole= 48/4=12, for a coil span of 10 slots, the coil is short pitched by 2 slots and the chording angle is ε=2γ and γ=180/12 ⇒ ε= 30° ⇒ Kp=cosε/2=0.9659.