Why is armature current higher than field current?
when the field curent is higher than the armature current, the armature reaction effect is minimised and generator is operating in over excited mode and deliver the leading VARs to the system rather than absorbing from system.
What is an armature current?
In electrical engineering, the armature is the winding (or set of windings) of an electric machine which carries alternating current.
In which motor armature current is same with field current?
shunt Motor
In shunt Motor the load current is equal to the sum of field current. and armature In shunt motor the load current is equal to the armature current. In shunt field generator, if load is not connected then armature current is equal to field current.. 14.
What is difference between armature and field winding?
Armature Winding is the winding, in which voltage is induced. Field Winding is the winding in which the main field flux is produced when the current through the winding is passed.
What is the relationship of the armature voltage and field current?
Based on the experiment I conducted, the data shows that the armature voltage is directly proportional to the field current.
Can you explain why there is an armature voltage even when the field current is zero?
However, even when the field current is zero, some amount of emf is generated (represented by OA in the figure below). This initially induced emf is due to the fact that there exists some residual magnetism in the field poles. Due to the residual magnetism, a small initial emf is induced in the armature.
What is an armature a field?
Generally, the armature is a rotating part of a machine. A current-carrying conductor experience force when it placed in the magnetic field and the direction of force is given by Fleming’s left-hand rule. When the supply is given to the stator, the rotating magnetic field is induced in the motor.
Is armature current proportional to field current?
Is line current the same as armature current?
So, as line current = armature current + field current, and field current is negligible compared to armature current, we can approximate line current to armature current. Yes, torque is proportional to armature current in a dc shunt motor.
What is the difference between armature?
In a generator and a motor, a rotor rotates and the stationary part of the motor is known as a stator. Similarly an armature carries current while field windings produce the magnetic field needed to excite the generator and the motor.
What is the use of field and armature system?
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.
When and why armature voltage control method is preferred?
Low energy efficiency: One reason why armature control is most commonly used for shorter lengths of time is that speed variation tends to waste large amounts of power. This power loss makes the process less energy efficient and more costly overall.
Why is a field current called an armature current?
Field current is a current because of the stator supply voltage which induced an EMF in armature according to Faraday’s law of electromagnetic induction and that emf supply current in armature called armature current. , My career was designing electric motors and generators.
How to calculate armature current?
To calculate Armature Current, you need Field Current (If) and Load current (Il). With our tool, you need to enter the respective value for Field Current and Load current and hit the calculate button. You can also select the units (if any) for Input (s) and the Output as well.
How does the armature current flow in an armature winding?
The armature current flows in the armature winding as a result of connec 1- the stationary part, which called “stator”. 2- the rotating part, which called “rotor”. Here, the field winding is mounted on the “rotor” where the field current flows through it which in turn causes the main flux of the machine.
What is an armature in electrical?
An armature is defined as the component of an electric machine (i.e. a motor or generator) that carries alternating current (AC). 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).