ALTERNATORS, A.C GENERATORS, OR SYNCHRONOUS GENERATOR.
ALTERNATORS:
A.C generators or Alternators is a special machine, which converts mechanical power to three-phase [3-Φ] A.C supply.
CONSTRUCTION:
ȀIn a synchronous generator, a DC current is applied to the rotor winding, which produce a rotor magnetic field
ȀThe prime mover, producing a rotating magnetic field within the machine, then turns the rotor of the generator
ȀThe rotor of a synchronous generator is essentially a large electromagnet. The magnetic poles on the rotor can be of either salient or non-salient construction.
ȀA salient pole is a magnetic pole that sticks out from the surface of the rotor. On the other hand a non-salient pole is a magnetic pole constructed flush with the surface of the rotor.
This generator Consists of an armature winding and magnetic fiel
Voltage produce by this generator is hig Current is taken from armatuIn this generator armature is stationery but field is rotating
This generator Consists of an armature winding and magnetic field
Voltage produce by this generator is lowent is taken from brushes.
In this generator armature is rotating but field is stationary.rent is not applied to the rotor winding for produce the rotor magnetic field.
A DC current must be supplied to the field circuit on the rotor. Since the rotor is rotating, a special arrangement is required to get the DC power to its field windings. There are two common approaches to supplying this DC power
1. Supply the DC power from an external DC source to the rotor by means of slip rings and brushes.
2. Supply the DC power from a special DC power source mounted directly on the shaft of the synchronous generator.
ALTERNATORS:
A.C generators or Alternators is a special machine, which converts mechanical power to three-phase [3-Φ] A.C supply.
CONSTRUCTION:
ȀIn a synchronous generator, a DC current is applied to the rotor winding, which produce a rotor magnetic field
ȀThe prime mover, producing a rotating magnetic field within the machine, then turns the rotor of the generator
ȀThe rotor of a synchronous generator is essentially a large electromagnet. The magnetic poles on the rotor can be of either salient or non-salient construction.
ȀA salient pole is a magnetic pole that sticks out from the surface of the rotor. On the other hand a non-salient pole is a magnetic pole constructed flush with the surface of the rotor.
This generator Consists of an armature winding and magnetic fiel
Voltage produce by this generator is hig Current is taken from armatuIn this generator armature is stationery but field is rotating
This generator Consists of an armature winding and magnetic field
Voltage produce by this generator is lowent is taken from brushes.
In this generator armature is rotating but field is stationary.rent is not applied to the rotor winding for produce the rotor magnetic field.
A DC current must be supplied to the field circuit on the rotor. Since the rotor is rotating, a special arrangement is required to get the DC power to its field windings. There are two common approaches to supplying this DC power
1. Supply the DC power from an external DC source to the rotor by means of slip rings and brushes.
2. Supply the DC power from a special DC power source mounted directly on the shaft of the synchronous generator.