DC Generators

Problem 477: A four-pole, DC generator with lap winding has 48 slots and 4 elements per slot. How many coils does it have?

Problem 478: If the armature of an eight-pole machine were wound with a simplex wave winding, how many parallel paths would there be?

Problem 490: The field current of a 100 kW, 250-volt shunt generator is 5 amperes when delivering power at rated terminal voltage and rated load current. The combined armature and brush resistance is 0.01 ohm. Determine the efficiency of the generator.

Problem 524: Two shunt generators are operating in parallel and taking equal shares of a 2400 A, 230 V bus load. Ratings: Generator 1 (3% reg, 500 kW, 250V), Generator 2 (4% reg, 600 kW, 250V). If an additional 600-A load is connected to the bus, determine the current delivered by each generator at this condition.

In a 4 pole, 35 slot, dc armature, 180 electrical degrees coil span will be obtained when coils occupy _ slots.

An 8 pole lap wound dc generator has 1000 conductors in its armature. The flux produced per pole is 20 mWb and emf generated is 400 v. What is the speed of the machine?

A dc shunt generator has an induced voltage of 220 V on open circuit. When the machine is on load the voltage is 200 V. Find the load current if the field resistance is 100 Ω and the armature resistance is 0.2 Ω.

An 8-pole lap wound dc generator has 1,000 armature conductors, flux of 20 mWb per pole and emf generated is 400 v. What is the speed of the machine?

A dc machine has 8 poles and a rated current of 100A. How much current will flow in each conductor at rated condition if the armature is simplex lap wound?

A 4-pole lap-wound armature has 480 conductors and a flux per pole of 25mWb. What is the emf generated, when running at 600 rpm?

In a 12-Pole duplex lap wound dc armature, each conductor can carry a current of 50 amperes. If the total armature conductor is 600, what is the rated current of the armature?

A 4 pole dc generator has a total of 600 conductors in its lap wound armature. The flux per pole is \(10^{6}\) lines. Determine the generated emf if it is driven at 2400 rpm.

The active length of each conductor placed in a DC generator armature is 0.4 m. The armature is rotated at a speed of 1,800 rpm in a magnetic field of average flux density 1.2 T. The diameter of the armature is 0.5 m. Find the emf induced in the conductor when it cuts the magnetic field at right angles.

In a generator, if the voltage regulation is 5.5% and the full-load voltage is 220 volts, what is the no-load voltage?

A 4-pole wave wound generator has 220 coils of 10 turns each. The resistance of each turn is 0.02 Ω. Find the resistance of the armature winding.

An 8-pole lap wound dc generator has 1,000 armature conductors, flux of 20 mWb per pole and emf generated is 400 v. What is the speed of the machine?

A 4-pole wave wound generator has 220 coils of 10 turns each. The resistance of each turn is 0.02 Ω. Find the resistance of the armature winding.

How many commutator bars does a 6-pole dc generator with 4 coil sides per slot and 20 slots per pole have?

An 8-pole triplex wave-wound armature carries a total of 660 amperes. If there are 8 brush arms, calculate the current in each armature conductor.