em 1 cat 2 set 1
... (ii)A 4-pole, lap-wound dc machine has 728 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 32 m Wb/pole. The machine (generator) is run from a prime mover (diesel engine) at 1600 rpm. It supplies a current of 100 A to an electric load. (1) Calculate t ...
... (ii)A 4-pole, lap-wound dc machine has 728 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 32 m Wb/pole. The machine (generator) is run from a prime mover (diesel engine) at 1600 rpm. It supplies a current of 100 A to an electric load. (1) Calculate t ...
INTRODUCTION TO DC GENERATOR
... The generated voltage depends upon the number of poles and armature winding turns. It has armature with iron core and air gap which is uniform the vicinity of the center of the pole and which becomes larger as the pole tips are approached.This construction gives a uniform flux distribution under the ...
... The generated voltage depends upon the number of poles and armature winding turns. It has armature with iron core and air gap which is uniform the vicinity of the center of the pole and which becomes larger as the pole tips are approached.This construction gives a uniform flux distribution under the ...
`The Atoms Family` (A Great Electrical Resource Site) `Just for Kids
... Opposite poles attract and like poles repel. All electric motors operate on this principle. Some motors run on direct current (DC). It is 'direct', because the electricity flows in only one direction. Alternating current (AC) flows back and forth 60 times per second ...
... Opposite poles attract and like poles repel. All electric motors operate on this principle. Some motors run on direct current (DC). It is 'direct', because the electricity flows in only one direction. Alternating current (AC) flows back and forth 60 times per second ...
Budgeting - Learning While Doing
... These plates provide the two connections for the coil of the electromagnet. • Commutator and brushes work together to let current flow to the electromagnet, and also to flip the direction that the electrons are flowing at just the right moment • The contacts of the commutator are attached to the axl ...
... These plates provide the two connections for the coil of the electromagnet. • Commutator and brushes work together to let current flow to the electromagnet, and also to flip the direction that the electrons are flowing at just the right moment • The contacts of the commutator are attached to the axl ...
THE CARBON BRUSH
... slipring surface clean, smooth and protected by a film of carbon so as to maintain intimate contact throughout the operation of the machine without wearing itself and also the commutator too quickly. All these duties of a brush make it necessary that it should be made of a material having all the ph ...
... slipring surface clean, smooth and protected by a film of carbon so as to maintain intimate contact throughout the operation of the machine without wearing itself and also the commutator too quickly. All these duties of a brush make it necessary that it should be made of a material having all the ph ...
Topic 6 Powerpoint Slides
... made up of a ring of nonmagnetic conducting wires connected at the ends and held in a laminated steel cylinder. • Surrounding the rotor is a stationary component called a stator. ...
... made up of a ring of nonmagnetic conducting wires connected at the ends and held in a laminated steel cylinder. • Surrounding the rotor is a stationary component called a stator. ...
Neutral zone - Schunk Carbon Technology
... It is thus necessary to insure that voltage is not induced in the commutator loop at the time of the momentary short. If the short occurs when the active conductors in the armature loop are moving in parallel to the field, magnetic lines of force will not be cut and voltage will not be induced in th ...
... It is thus necessary to insure that voltage is not induced in the commutator loop at the time of the momentary short. If the short occurs when the active conductors in the armature loop are moving in parallel to the field, magnetic lines of force will not be cut and voltage will not be induced in th ...
Topic 6 - Generators and Motors
... • Faraday discovered electromagnetic induction in 1831. He demonstrated that moving a conducting wire back and forth through a magnetic field generated a current. • Faraday created the first electricity-producing generator, which could generate electrical current. • He also found that moving the mag ...
... • Faraday discovered electromagnetic induction in 1831. He demonstrated that moving a conducting wire back and forth through a magnetic field generated a current. • Faraday created the first electricity-producing generator, which could generate electrical current. • He also found that moving the mag ...
Commutator
... Commutator and brush arrangement are used to convert the bidirectional current to unidirectional current Brushes are located at the magnetic neutral axis ( mid way between two adjacent poles) The phenomenon of commutation is affected by resistance of the brush, reactance emf induced by leakage ...
... Commutator and brush arrangement are used to convert the bidirectional current to unidirectional current Brushes are located at the magnetic neutral axis ( mid way between two adjacent poles) The phenomenon of commutation is affected by resistance of the brush, reactance emf induced by leakage ...
LAP WINDING
... Figure from Principles of Electric Machines and Power Electronics, 2nd Edition, P.C. Sen, John Wiley and Sons, 1997. Figure represents an unrolled lap winding of a dc armature, along with the commutator segments (bars) and stationary brushes. Coils are added in series until the end of the last coil ...
... Figure from Principles of Electric Machines and Power Electronics, 2nd Edition, P.C. Sen, John Wiley and Sons, 1997. Figure represents an unrolled lap winding of a dc armature, along with the commutator segments (bars) and stationary brushes. Coils are added in series until the end of the last coil ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.