Contents
What does the armature do in a DC generator?
In electrical engineering, an armature is the component of an electric machine which carries alternating current. The armature windings conduct AC even on DC machines, due to the commutator action (which periodically reverses current direction) or due to electronic commutation, as in brushless DC motors.
What is the cause for heavy sparking in brushes of DC generator?
Vibration of the machine itself may cause brush sparking and eventually result in commutator damage. Such vibration may be caused by imbalance in the armature, by poor foundations or other mechanical faults. It can also result from defective bearings.
How the effect of armature reaction can be reduced in a DC generator?
How to Reduce Armature reaction in DC Machine. Armature Reaction refers to a phenomenon in DC machines where the magnetic field of the poles is distorted by the magnetic field produced by the armature current. Thus by increasing length of air gap, the armature reaction effect is reduced.
What is difference between armature and rotor?
It is located inside the stator and its objective is to rotate so that in turn the motor shaft or generator rotates. So basically, the rotor consists of a field magnet which rotates while the rotor remains stationary and on the other hand the armature carries current and is stationary and part of the stator.
Which of the following is effect of armature reaction?
Demagnetization effects which of the following? Demagnetization is one of the effect of armature reaction. By vector addition it is found that it reduces or weakens the main field flux. So it reduces the induced emf or terminal voltage in case of generator because Eg is directly proportional to the flux (φ).
How do you reduce armature effect?
The armature teeth and air gap at pole tips offer reluctance to armature flux. Thus by increasing length of air gap, the armature reaction effect is reduced. If reluctance at pole tips is increased it will reduce distorting effect of armature reaction.
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.