A 6 pole D-C generator has an armature winding with 684 conductors connected in 12 parallel...
- A 6 pole D-C generator has an armature winding with 684 conductors connected in 12 parallel paths. Calculate the generated voltage in this machine if each pole produces 8410000 maxwells and the armature speed is 1410 rpm.
- 675.9117
- 677.9118
- 677.9117
- 675.9118
- The armature winding of a 6 pole D-C generator has 192 conductors connected in 12 parallel paths. At what speed should the machine be driven if it is to develop 220.4608 volts if each pole produces 1.036E+07 maxwells.
- 1335
- 1654
- 1652
- 1330
- Calculate the voltage generated by a 4 pole D-C machine given the following particulars: Number of slots in armature = 68; number of conductors per slot = 2 flux per pole = 3840000 Maxwell; speed = 1260 rpm. number of parallel paths in armature = 4
- 108.6705
- 109.6705
- 109.6704
- 108.6704
- To what value of flux per pole should the excitation be adjusted if the generated voltage of a 4 pole machine is 26.13333 volts when operated at 700 rpm? The number of armature slots is 64, and the armature winding has 8 parallel paths with 4 conductors in each slot.
- 1750000
- 1760000
- 1770000
Homework Answers
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A 6 pole D-C generator has an armature winding with 684
conductors connected in 12 parallel...
A6 A 8-pole lap wound armature rotated at 600 rpm is designed to generate 240 V....
A6 A 8-pole lap wound armature rotated at 600 rpm is designed to generate 240 V. The flux per pole is 0.06 Wb and the armature has 100 slots. (a) Determine the suitable number of conductors for each of the slot. (b) Based on the result found in part (a), calculate the armature voltage if its winding is changed to a wave winding and the motor speed is decreased to 200 rpm. (3 marks) (2 marks) A7 Elaborate the merits...
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The...
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The armature winding has 60 coils of 5 turns each and is simplex wave-wound with parallel path 2. The average flux density at the air-gap under each pole is 0.7T. Find the following: 0 The total number of conductors in the armature winding (11) Flux per pole Wb/m2 (iii) The machine constant ke or kt (iv) Induced armature voltage if the speed of the armature...
An eight-pole 500 V, 500 kW dc generator has a lap winding with 640 armature conductors. If the g...
An eight-pole 500 V, 500 kW dc generator has a lap winding with 640 armature conductors. If the generator has six commutating poles, determine the following: (a) The number of turns in the commutating winding if the mmf of the commutating poles is 1.8 times that of the armature (b) The number of conductors for the compensating winding in each pole face if the generator has a compensating winding and the pole face covers 80% of the pole span (c)...
A 4-pole, lap wound, d.c machine has total number of 800 armature conductors and produces 0.03...
A 4-pole, lap wound, d.c machine has total number of 800 armature conductors and produces 0.03 Wb flux per pole when field is excited. If the machine is driven by a prime mover at 1000 rpm, calculate the generated emf across the armature. If the generator is loaded to deliver an armature current of 50 A, Calculate the prime mover and electromagnetic torques developed at this load current. Neglect frictional torque.
a 6-pole dc generator has a simple wavy winding induced with 288 coils of 5 turns...
a 6-pole dc generator has a simple wavy winding induced with 288 coils of 5 turns each, the resistance of each turn is 0.022 ohms between lap, its flow per pole is .15wb and it is rotating at 600 rpm a) how many current paths there is in the machine b) what is the armature voltage induced in this machine c) what is the effective resistance of the armor of this machine d) if a 5kohm resistor is connected to...
2S QUESTION 3 (a) In the direct-current (d.c.) generator shown in Figure 03.1, (i) ?, is...
2S QUESTION 3 (a) In the direct-current (d.c.) generator shown in Figure 03.1, (i) ?, is the useful flux per pole, (ii)"N,' is the speed of the armature in revolutions per minute (rpm), (ii) 'p' is the number of pole-pairs/pairs of poles, (iv) 'Z' is the total number of conductors on the armature and (v) c' is the number of parallel paths through the winding between the positive and the negative brushes. From first principles and in not less than...
The armature of a 6-pole separately excited dc generator is lap wound with 534 conductors. This...
The armature of a 6-pole separately excited dc generator is lap wound with 534 conductors. This machine delivers power to the load at 250V while being driven at 1000 rpm. At this load, the armature circuit dissipates 640W. If the flux per pole of this generator is 30-mWb, determine the kW rating of the load served.Assume a total brush contact drop of 2V.
A 3-phase, 12-pole, star-connected alternator has 24 slots with 43 conductors per slot. The coil-span is...
A 3-phase, 12-pole, star-connected alternator has 24 slots with 43 conductors per slot. The coil-span is 7 slots. Find the phase and line induced EMFs if the flux per pole is 0.064 weber and the machine runs at 720 RPM
4.4 Th e armature of a motor has a radius of 0.12 m and an effective length of 0.25 m. The armatu...
electric machines and drives
4.4 Th e armature of a motor has a radius of 0.12 m and an effective length of 0.25 m. The armature winding consists of 37 coils each with six turns accommodated in 37 slots. The field structure has four poles which cover 70% of the armature periphery. The average flux density in the air gap un- der each pole shoe is 0.8 T. The armature winding is connected in two par- allel paths. (a) Determine...
the winding of a dc generator has 2 parallel paths and 200 conductors. If the resistance...
the winding of a dc generator has 2 parallel paths and 200 conductors. If the resistance per conductor is 5 mili ohms, what is the total armature resistance?
A6 A 8-pole lap wound armature rotated at 600 rpm is designed to generate 240 V. The flux per pole is 0.06 Wb and the armature has 100 slots. (a) Determine the suitable number of conductors for each of the slot. (b) Based on the result found in part (a), calculate the armature voltage if its winding is changed to a wave winding and the motor speed is decreased to 200 rpm. (3 marks) (2 marks) A7 Elaborate the merits...
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The armature winding has 60 coils of 5 turns each and is simplex wave-wound with parallel path 2. The average flux density at the air-gap under each pole is 0.7T. Find the following: 0 The total number of conductors in the armature winding (11) Flux per pole Wb/m2 (iii) The machine constant ke or kt (iv) Induced armature voltage if the speed of the armature...
2S QUESTION 3 (a) In the direct-current (d.c.) generator shown in Figure 03.1, (i) ?, is the useful flux per pole, (ii)"N,' is the speed of the armature in revolutions per minute (rpm), (ii) 'p' is the number of pole-pairs/pairs of poles, (iv) 'Z' is the total number of conductors on the armature and (v) c' is the number of parallel paths through the winding between the positive and the negative brushes. From first principles and in not less than...
A 3-phase, 12-pole, star-connected alternator has 24 slots with 43 conductors per slot. The coil-span is 7 slots. Find the phase and line induced EMFs if the flux per pole is 0.064 weber and the machine runs at 720 RPM
electric machines and drives
4.4 Th e armature of a motor has a radius of 0.12 m and an effective length of 0.25 m. The armature winding consists of 37 coils each with six turns accommodated in 37 slots. The field structure has four poles which cover 70% of the armature periphery. The average flux density in the air gap un- der each pole shoe is 0.8 T. The armature winding is connected in two par- allel paths. (a) Determine...
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