this law states that “An emf is induced when the
magnetic flux across the coil changes with time.”
faraday’s first law of electromagnetic induction
a machine that converts mechanical energy (or power) into electrical energy (or power).
electrical generator
according to this law, whenever a conductor cuts magnetic flux,dynamically induced e.m.f. is produced in it.
faraday’s laws of electromagnetic induction
what are the two basic essential parts of an electrical generator
- magnetic field
- conductors
what are the basic essential parts of a dc generator?
- Magnetic Frame or Yoke
- Pole-Cores and Pole-Shoes
- Pole Coils or Field Coils
- Armature Core
- Armature Windings or Conductors
- Commutator
- Brushes and Bearings
is a part of an electric motor or generator that helps create magnetic fields.
pole coils or field coils
is a coil or coils of insulated copper wire wound around the slots on the peripheral surface of the soft iron cylindrical core or armature of a DC machine.
armature winding
what happens when an electric current passed through the coils?
they generate magnetic field
The distance between two adjacent poles
pole pitch
The length of a wire lying in the magnetic field and
in which an e.m.f. is induced
conductor
The side of a coil (1-turn or multiturn) is called?
winding element
consists of one or multiple turns of a conductor. A single loop of the conductor is called a single-turn coil.
coil
It is the distance, measured in terms of armature slots between two sides of a coil.
coil span/ coil pitch
If the coil span is equal to the pole pitch, then the armature winding is said to be?
full pitched winding
here, the coil pitch is less than the pole pitch, meaning the coil sides are placed less than 180° apart. (Coil pitch and pole pitch are not equal).
fractional pitched winding
ii is typically defined by the fraction of the pole pitch that the coil covers. It is the difference between the full-pitch coil and the chorded coil.
chording pitched winding
The distance, measured in terms of the armature conductors, which a coil advances on the back of the armature and is denoted by YB.
back pitch
defined as the distance round the armature between two successive conductors which are directly connected together. Or, it is the distance between th beginnings of two consecutive turns.
pitch of a winding
The number of armature conductors or elements spanned by a coil on the front (or commutator end of an armature) and is designated by YF.
front pitch
It is the distance between the beginning of one coil and the beginning of the next coil to which it is connected.
resultant pitch
It is that winding in which one conductor or one coil side is placed in each armature slot.
single-layer winding
In this type of winding, there are two conductors or coil sides per slot arranged in two layers.
two-layer winding
is a type of winding used in DC machines, specifically for lap winding, where the winding is divided into multiple layers or groups of coils. This
multiplex winding
It is the distance between the beginning of one coil and the beginning of the next coil to which it is connected.
commutator pitch
