Alternators

Problem 571: What is the speed of a 100 kW, 230-volt, three-phase, four-pole, 60 Hz alternator?

Problem 572: A six-pole, 3-phase AC generator has 72 slots, the coil span is 12. What is the pitch factor?

Problem 578: A three-phase, 6-pole, 72-slot armature of a synchronous generator is wound using a two-layer lap coil having 20 conductors per coil with a pitch of 83.33%. The flux per pole is 4,800,000 maxwells. If the rotor of the generator is driven at a speed of 1200 rpm, calculate the induced emf per phase.

Calculate the average voltage generated in a six turn full pitch coil of a 60 cycle alternator if the flux per pole is \(7.2 \times 10^{5}\) maxwells.

For a coil having a span of 2/3 of pole pitch, the coil span factor is

A winding is short pitched by 60 degrees electrical. Its pitch factor is:

In a 10-pole synchronous machine, 20 electrical degrees are equivalent to how many mechanical degrees?

Calculate the average voltage generated in a six-turn full-pitch coil of a 25-cycle alternator if the flux per pole is \(7.2 \times 10^{5}\) maxwells.

A 500 kVA alternator operates at 80% of full load with an efficiency of 92 percent. If the load power factor is 0.8, calculate the total loss.

A three-phase, wye-connected, 6.25 kVA, 220-volt synchronous generator has a reactance of 8.4 ohms per phase. Using the rated kVA and voltage as base values, determine the per unit reactance.

A two-pole alternator is running at 1,500 rpm. What is the angular velocity?

Calculate the effective voltage in one phase of an alternator, given the following particulars: f = 60 cps; turns per phase N = 240; flux per pole = \(2.08 \times 10^{6}\) maxwells.

For coil having a span of 2/3 of pole pitch, the coil span factor is

In a 6-pole alternator how many mechanical degrees is the equivalent of 180 electrical degrees?

The field system of a 50 Hz alternator has a sinusoidal flux per pole of 0.1 Wb. Calculate the emf generated in one turn which spans two-thirds of a pole pitch.