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Does a generator have an armature?
Most modern, larger generators have a stationary armature (stator) with a rotating current-carrying conductor (rotor or revolving field). The regulator rectifies this voltage and applies DC to the exciter stator. The DC voltage appears in the main revolving field and induces a higher AC voltage in the main stator.
What is the difference between stator and armature?
The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor. Most large machines, however, have a rotating field and a stationary armature. Thus, the armature is the stator and the field is the rotor.
What causes armature failure?
Worn commutators are one of the most common causes of armature failure. When commutators become worn or damaged, they wear down carbon brushes much quicker which can result in a damaged or destroyed armature.
Why does the armature of a generator rotate?
2.4. The armature is mounted on bearings and is free to rotate. It is mounted in the magnetic field produced by permanent magnets or current passing through coils of wire, these being termed the field coils. When a current passes through the armature coil, forces act on the coil leading to rotation.
What’s the use of armature?
An armature is used as an electric motor or generator. The armature is used to communicate between two magnetic fluxes. When the armature is used as an electric motor, due to relative motion between flux produced by the field winding and the flux produced by the armature winding the EMF is induced.
How does an armature work?
In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine or motor is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft.
Can an armature be repaired?
Over time the insulation between the commutator segments becomes proud as the copper of the commutator surface wears away. This fault can usually be repaired without rewinding the armature by turning the commutator brush surface down below the damage and then undercutting the insulation between the commutator segments.
Can a commutator be repaired?
Mold-type commutators are not repairable and must be replaced if damaged. When a commutator comes in for a repair, units are disassembled and rebuilt with new copper and mica segments using the same quality assurance processes applied to new commutators.
Where is the armature in an electric generator?
In electrical engineering, an armature is the power-producing component of an electric machine. The armature can be on either the rotor (rotating part) or the stator (stationary part) of the electric machine.
Which is an example of an armature in Electrical Engineering?
Armature (electrical) In electrical engineering, an armature is the component of an electric machine which carries alternating current. The armature windings conduct AC current even on DC machines, due to the commutator action (which periodically reverses current direction) or due to electronical commutation, as in brushless DC motors.
What does the armature do in a DC motor?
The armature conducts AC even on DC ( Direct Current) machines via the commutator (which periodically reverses current direction) or due to electronic commutation, (e.g. in a brushless DC motor ). The armature provides housing and support to the armature winding.
What happens to the armature in a no load generator?
When the generator is on no-load no current flows i.e, current in armature conductors or circuit is zero. The brushes are also shown touching the armature directly, but in practice, they touch commutator segments. There is uniform flux distribution through the armature conductors with respect to the axis of the poles.