Fundamentals of electrical machinery

an electrical generator that creates direct current using a commutator.

The working principle of a dynamo is based on

This law states that “Whenever a conductor cuts across the magnetic field, an

emf is induced in the conductor.” or “Whenever the magnetic flux linking with any circuit

(or coil) changes, an emf is induced in the circuit.”

This law states that “The magnitude of induced emf in a coil is directly

proportional to the rate of change of flux linkages.”

This rule is applied to determine the direction of induced emf in a

conductor moving across the field and is stated as: “Stretch, first finger, second finger, and thumb

of your right hand mutually perpendicular to each other

This law is more suitably applied to determine the direction of induced emf in a coil

or circuit when flux linking with it changes. It is stated as: “In effect, electro-magnetically induced

emf and hence current flows in a coil or circuit in such a direction that the magnetic field set up

by it, always opposes the very cause which produces it.”

It is made up of cast iron or steel. It not only

provides mechanical strength to the whole assembly but also carries the magnetic flux

produced by the field winding

Enameled copper wire is used for the construction of field or exciting

coils.

The rotating part. It is cylindrical in shape with slots to carry armature

winding.

Heart of a dynamo. It is a place where one form of power is converted to the other form i.e., in case of dynamo, mechanical power is converted into electrical power