A six-pole machine has an armature of 90 slots and 8 conductors per slot and revolves at 1000 r.p.m. the flux per pole being 50 milli weber. Calculate the e.m.f. generated as a three-phase star-connected ma- chine if the winding factor is 0.96 and all the conductors in each phase are in series.
A six-pole machine has an armature of 90 slots and 8 conductors per slot and revolves at 1000 r.p.m. the flux per pole being 50 milli weber. Calculate the e.m.f. generated as a three-phase star-connected ma- chine if the winding factor is 0.96 and all the conductors in each phase are in series.
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![4. 4. 6:55 O -..
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f machines e book
563 / 709
1422
Electrical Technology
37.15. Factors Affecting Alternator Size
The efficiency of an alternator always increases as its power increases. For
IkW has an efficiency of 50%, then one of 10 MW will inevitably have an effi
10 electrical degrees between the e.m.f. in each coil and the next. Find graphically or by calct
r.m.s. value of the total phase voltage developed by the winding. If the alternator has six p.
driven at 100 r.p.m., calculate the frequency of the e.m.f. generated.
9. A 4-pole, 50-Hz, 3-phase, Y-connected alternator has a single-layer, full-pitch winding with
per pole and two conductors per slot. The fundamental flux is 0.6 Wb and air-gap flux contain
harmonic of 5% amplitude. Find the r.m.s. values of the phase e.m.f. due to the fundamental
3rd harmonic flux and the total induced e.m.f.
[108 V; 50 Hz)
[3,550 V; 119.5 V; 3,553 V] (Elect. Machines-, Osmania Unii
10. A3-phase, 10-pole alternator has 90 slots, each containing 12 conductors. If the speed is 600 r.p.
the flux per pole is 0.1 Wb, calculate the line e.m.f. when the phases are () star connected (i) delta
connected. Assume the winding factor to be 0.96 and the flux sinusoidally distributed.
(1) 6.93 kV (ii) 4 kV] (Elect. Engg-I1, Kerala Univ. 1979)
11. A star-connected 3-phase, 6-pole synchronous generator has a stator with 90 slots and 8 conductors per
slot. The rotor revolves at 1000 r.p.m. The flux per pole is 4 x 10 weber. Calculate the e.m.f.
generated, if all the conductors in each phase are in series. Assume sinusoidal flux distribution and full-
pitched coils.
12. A six-pole machine has an armature of 90 slots and 8 conductors per slot and revolves at 1000 r.p.m. the
flux per pole being 50 milli weber. Calculate the e.m.f. generated as a three-phase star-connected ma-
chine if the winding factor is 0.96 and all the conductors in each phase are in series.
(Eph = 1,066 V] (Elect. Machines, A.M.LE. Summer, 1979)
(1280 V] (Elect. Machines, AMIE, Sec. B, (E-3), Summer 1992).
13. A 3-phase, 16 pole alternator has a star connected winding with 144 slots and 10 conductors per slot.
The flux/pole is 0.04 wb (sinusoidal) and the speed is 375 rpm. Find the frequency and phase and line
e.m.f. The total turns/phase may be assumed to series connected.
[50 Hz, 2035 Hz, 3525 V] (Rajiv Gandhi Technical University, Bhopal, 2000)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8e3b61b5-40ac-4ba7-96fb-5cb1ee4a96d1%2F73cc2152-ab01-47f3-9588-f39709226bde%2Fbg1oz99_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4. 4. 6:55 O -..
N I 00 23% D
f machines e book
563 / 709
1422
Electrical Technology
37.15. Factors Affecting Alternator Size
The efficiency of an alternator always increases as its power increases. For
IkW has an efficiency of 50%, then one of 10 MW will inevitably have an effi
10 electrical degrees between the e.m.f. in each coil and the next. Find graphically or by calct
r.m.s. value of the total phase voltage developed by the winding. If the alternator has six p.
driven at 100 r.p.m., calculate the frequency of the e.m.f. generated.
9. A 4-pole, 50-Hz, 3-phase, Y-connected alternator has a single-layer, full-pitch winding with
per pole and two conductors per slot. The fundamental flux is 0.6 Wb and air-gap flux contain
harmonic of 5% amplitude. Find the r.m.s. values of the phase e.m.f. due to the fundamental
3rd harmonic flux and the total induced e.m.f.
[108 V; 50 Hz)
[3,550 V; 119.5 V; 3,553 V] (Elect. Machines-, Osmania Unii
10. A3-phase, 10-pole alternator has 90 slots, each containing 12 conductors. If the speed is 600 r.p.
the flux per pole is 0.1 Wb, calculate the line e.m.f. when the phases are () star connected (i) delta
connected. Assume the winding factor to be 0.96 and the flux sinusoidally distributed.
(1) 6.93 kV (ii) 4 kV] (Elect. Engg-I1, Kerala Univ. 1979)
11. A star-connected 3-phase, 6-pole synchronous generator has a stator with 90 slots and 8 conductors per
slot. The rotor revolves at 1000 r.p.m. The flux per pole is 4 x 10 weber. Calculate the e.m.f.
generated, if all the conductors in each phase are in series. Assume sinusoidal flux distribution and full-
pitched coils.
12. A six-pole machine has an armature of 90 slots and 8 conductors per slot and revolves at 1000 r.p.m. the
flux per pole being 50 milli weber. Calculate the e.m.f. generated as a three-phase star-connected ma-
chine if the winding factor is 0.96 and all the conductors in each phase are in series.
(Eph = 1,066 V] (Elect. Machines, A.M.LE. Summer, 1979)
(1280 V] (Elect. Machines, AMIE, Sec. B, (E-3), Summer 1992).
13. A 3-phase, 16 pole alternator has a star connected winding with 144 slots and 10 conductors per slot.
The flux/pole is 0.04 wb (sinusoidal) and the speed is 375 rpm. Find the frequency and phase and line
e.m.f. The total turns/phase may be assumed to series connected.
[50 Hz, 2035 Hz, 3525 V] (Rajiv Gandhi Technical University, Bhopal, 2000)
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